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- Committer: Teddy Hogeborn
- Date: 2014-06-07 21:59:20 UTC
- Revision ID: teddy@recompile.se-20140607215920-r4qkj7ktnjyqmrn5
Make mandos-client use fexecve().
* plugins.d/mandos-client.d (run_network_hooks): Use fexecve().
* plugins.d/mandos-client.d (run_network_hooks): Use fexecve().
- files added:
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_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() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
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() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
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() */
88
97
89
98
#ifdef __linux__
90
99
#include <sys/klog.h> /* klogctl() */
108
117
init_gnutls_session(),
109
118
GNUTLS_* */
110
119
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
113
122
114
123
/* GPGME */
115
124
#include <gpgme.h> /* All GPGME types, constants and
123
132
#define PATHDIR "/conf/conf.d/mandos"
124
133
#define SECKEY "seckey.txt"
125
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
136
127
137
bool debug = false;
128
138
static const char mandos_protocol_version[] = "1";
130
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
141
static const char sys_class_net[] = "/sys/class/net";
132
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
int hookdir_fd = -1;
145
uid_t uid = 65534;
146
gid_t gid = 65534;
133
147
134
148
/* Doubly linked list that need to be circularly linked when used */
135
149
typedef struct server{
136
150
const char *ip;
137
uint16_t port;
151
in_port_t port;
138
152
AvahiIfIndex if_index;
139
153
int af;
140
154
struct timespec last_seen;
144
158
145
159
/* Used for passing in values through the Avahi callback functions */
146
160
typedef struct {
147
AvahiSimplePoll *simple_poll;
148
161
AvahiServer *server;
149
162
gnutls_certificate_credentials_t cred;
150
163
unsigned int dh_bits;
152
165
const char *priority;
153
166
gpgme_ctx_t ctx;
154
167
server *current_server;
168
char *interfaces;
169
size_t interfaces_size;
155
170
} mandos_context;
156
171
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 };
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
162
174
163
175
sig_atomic_t quit_now = 0;
164
176
int signal_received = 0;
165
177
166
178
/* Function to use when printing errors */
167
179
void perror_plus(const char *print_text){
180
int e = errno;
168
181
fprintf(stderr, "Mandos plugin %s: ",
169
182
program_invocation_short_name);
183
errno = e;
170
184
perror(print_text);
171
185
}
172
186
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
173
197
/*
174
198
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
199
* bytes. "buffer_capacity" is how much is currently allocated,
176
200
* "buffer_length" is how much is already used.
177
201
*/
202
__attribute__((nonnull, warn_unused_result))
178
203
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
204
size_t buffer_capacity){
180
205
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
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;
183
212
return 0;
184
213
}
214
*buffer = new_buf;
185
215
buffer_capacity += BUFFER_SIZE;
186
216
}
187
217
return buffer_capacity;
188
218
}
189
219
190
220
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
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){
194
224
int ret;
195
225
server *new_server = malloc(sizeof(server));
196
226
if(new_server == NULL){
197
227
perror_plus("malloc");
198
return -1;
228
return false;
199
229
}
200
230
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
231
.port = port,
232
.if_index = if_index,
233
.af = af };
204
234
if(new_server->ip == NULL){
205
235
perror_plus("strdup");
206
return -1;
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;
207
242
}
208
243
/* Special case of first server */
209
if (mc.current_server == NULL){
244
if(*current_server == NULL){
210
245
new_server->next = new_server;
211
246
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
247
*current_server = new_server;
214
248
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
249
/* Place the new server last in the list */
250
new_server->next = *current_server;
251
new_server->prev = (*current_server)->prev;
217
252
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
253
(*current_server)->prev = new_server;
254
}
255
return true;
226
256
}
227
257
228
258
/*
229
259
* Initialize GPGME.
230
260
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
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){
233
266
gpgme_error_t rc;
234
267
gpgme_engine_info_t engine_info;
235
268
236
237
269
/*
238
270
* Helper function to insert pub and seckey to the engine keyring.
239
271
*/
240
bool import_key(const char *filename){
272
bool import_key(const char * const filename){
241
273
int ret;
242
274
int fd;
243
275
gpgme_data_t pgp_data;
250
282
251
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
284
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
255
287
return false;
256
288
}
257
289
258
rc = gpgme_op_import(mc.ctx, pgp_data);
290
rc = gpgme_op_import(mc->ctx, pgp_data);
259
291
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
262
294
return false;
263
295
}
264
296
271
303
}
272
304
273
305
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
306
fprintf_plus(stderr, "Initializing GPGME\n");
275
307
}
276
308
277
309
/* Init GPGME */
278
310
gpgme_check_version(NULL);
279
311
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
312
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
gpgme_strsource(rc), gpgme_strerror(rc));
283
315
return false;
284
316
}
285
317
286
318
/* Set GPGME home directory for the OpenPGP engine only */
287
319
rc = gpgme_get_engine_info(&engine_info);
288
320
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
gpgme_strsource(rc), gpgme_strerror(rc));
291
323
return false;
292
324
}
293
325
while(engine_info != NULL){
299
331
engine_info = engine_info->next;
300
332
}
301
333
if(engine_info == NULL){
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
334
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
335
tempdir);
303
336
return false;
304
337
}
305
338
306
339
/* Create new GPGME "context" */
307
rc = gpgme_new(&(mc.ctx));
340
rc = gpgme_new(&(mc->ctx));
308
341
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
311
345
return false;
312
346
}
313
347
322
356
* Decrypt OpenPGP data.
323
357
* Returns -1 on error
324
358
*/
359
__attribute__((nonnull, warn_unused_result))
325
360
static ssize_t pgp_packet_decrypt(const char *cryptotext,
326
361
size_t crypto_size,
327
char **plaintext){
362
char **plaintext,
363
mandos_context *mc){
328
364
gpgme_data_t dh_crypto, dh_plain;
329
365
gpgme_error_t rc;
330
366
ssize_t ret;
332
368
ssize_t plaintext_length = 0;
333
369
334
370
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
372
}
337
373
338
374
/* Create new GPGME data buffer from memory cryptotext */
339
375
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
376
0);
341
377
if(rc != GPG_ERR_NO_ERROR){
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
344
380
return -1;
345
381
}
346
382
347
383
/* Create new empty GPGME data buffer for the plaintext */
348
384
rc = gpgme_data_new(&dh_plain);
349
385
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
352
389
gpgme_data_release(dh_crypto);
353
390
return -1;
354
391
}
355
392
356
393
/* Decrypt data from the cryptotext data buffer to the plaintext
357
394
data buffer */
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
396
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
362
399
plaintext_length = -1;
363
400
if(debug){
364
401
gpgme_decrypt_result_t result;
365
result = gpgme_op_decrypt_result(mc.ctx);
402
result = gpgme_op_decrypt_result(mc->ctx);
366
403
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
405
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
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);
373
410
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
412
}
376
413
gpgme_recipient_t recipient;
377
414
recipient = result->recipients;
378
415
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
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");
385
423
recipient = recipient->next;
386
424
}
387
425
}
390
428
}
391
429
392
430
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
432
}
395
433
396
434
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
441
*plaintext = NULL;
404
442
while(true){
405
443
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
444
(size_t)plaintext_length,
445
plaintext_capacity);
408
446
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
447
perror_plus("incbuffer");
448
plaintext_length = -1;
449
goto decrypt_end;
412
450
}
413
451
414
452
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
465
}
428
466
429
467
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
468
fprintf_plus(stderr, "Decrypted password is: ");
431
469
for(ssize_t i = 0; i < plaintext_length; i++){
432
470
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
471
}
444
482
return plaintext_length;
445
483
}
446
484
447
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
487
const char *ret = gnutls_strerror(value);
450
488
if(ret == NULL)
451
489
ret = "(unknown)";
452
490
return ret;
453
491
}
454
492
455
493
/* GnuTLS log function callback */
494
__attribute__((nonnull))
456
495
static void debuggnutls(__attribute__((unused)) int level,
457
496
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
497
fprintf_plus(stderr, "GnuTLS: %s", string);
459
498
}
460
499
500
__attribute__((nonnull, warn_unused_result))
461
501
static int init_gnutls_global(const char *pubkeyfilename,
462
const char *seckeyfilename){
502
const char *seckeyfilename,
503
mandos_context *mc){
463
504
int ret;
464
505
465
506
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
508
}
468
509
469
510
ret = gnutls_global_init();
470
511
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
473
514
return -1;
474
515
}
475
516
482
523
}
483
524
484
525
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
527
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
489
530
gnutls_global_deinit();
490
531
return -1;
491
532
}
492
533
493
534
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
537
pubkeyfilename,
538
seckeyfilename);
497
539
}
498
540
499
541
ret = gnutls_certificate_set_openpgp_key_file
500
(mc.cred, pubkeyfilename, seckeyfilename,
542
(mc->cred, pubkeyfilename, seckeyfilename,
501
543
GNUTLS_OPENPGP_FMT_BASE64);
502
544
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
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));
508
550
goto globalfail;
509
551
}
510
552
511
553
/* GnuTLS server initialization */
512
ret = gnutls_dh_params_init(&mc.dh_params);
554
ret = gnutls_dh_params_init(&mc->dh_params);
513
555
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
516
559
goto globalfail;
517
560
}
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
519
562
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
522
565
goto globalfail;
523
566
}
524
567
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
526
569
527
570
return 0;
528
571
529
572
globalfail:
530
573
531
gnutls_certificate_free_credentials(mc.cred);
574
gnutls_certificate_free_credentials(mc->cred);
532
575
gnutls_global_deinit();
533
gnutls_dh_params_deinit(mc.dh_params);
576
gnutls_dh_params_deinit(mc->dh_params);
534
577
return -1;
535
578
}
536
579
537
static int init_gnutls_session(gnutls_session_t *session){
580
__attribute__((nonnull, warn_unused_result))
581
static int init_gnutls_session(gnutls_session_t *session,
582
mandos_context *mc){
538
583
int ret;
539
584
/* GnuTLS session creation */
540
585
do {
544
589
}
545
590
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
591
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
592
fprintf_plus(stderr,
593
"Error in GnuTLS session initialization: %s\n",
594
safer_gnutls_strerror(ret));
549
595
}
550
596
551
597
{
552
598
const char *err;
553
599
do {
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
601
if(quit_now){
556
602
gnutls_deinit(*session);
557
603
return -1;
558
604
}
559
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
606
if(ret != GNUTLS_E_SUCCESS){
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
607
fprintf_plus(stderr, "Syntax error at: %s\n", err);
608
fprintf_plus(stderr, "GnuTLS error: %s\n",
609
safer_gnutls_strerror(ret));
564
610
gnutls_deinit(*session);
565
611
return -1;
566
612
}
568
614
569
615
do {
570
616
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
571
mc.cred);
617
mc->cred);
572
618
if(quit_now){
573
619
gnutls_deinit(*session);
574
620
return -1;
575
621
}
576
622
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
623
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
624
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
625
safer_gnutls_strerror(ret));
580
626
gnutls_deinit(*session);
581
627
return -1;
582
628
}
584
630
/* ignore client certificate if any. */
585
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
586
632
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
588
634
589
635
return 0;
590
636
}
594
640
__attribute__((unused)) const char *txt){}
595
641
596
642
/* Called when a Mandos server is found */
597
static int start_mandos_communication(const char *ip, uint16_t port,
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
598
645
AvahiIfIndex if_index,
599
int af){
646
int af, mandos_context *mc){
600
647
int ret, tcp_sd = -1;
601
648
ssize_t sret;
602
union {
603
struct sockaddr_in in;
604
struct sockaddr_in6 in6;
605
} to;
649
struct sockaddr_storage to;
606
650
char *buffer = NULL;
607
651
char *decrypted_buffer = NULL;
608
652
size_t buffer_length = 0;
627
671
pf = PF_INET;
628
672
break;
629
673
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
675
errno = EINVAL;
632
676
return -1;
633
677
}
634
678
635
ret = init_gnutls_session(&session);
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);
636
712
if(ret != 0){
637
713
return -1;
638
714
}
639
715
640
716
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
643
719
}
644
720
645
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
657
733
658
734
memset(&to, 0, sizeof(to));
659
735
if(af == AF_INET6){
660
to.in6.sin6_family = (sa_family_t)af;
661
ret = inet_pton(af, ip, &to.in6.sin6_addr);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
662
738
} else { /* IPv4 */
663
to.in.sin_family = (sa_family_t)af;
664
ret = inet_pton(af, ip, &to.in.sin_addr);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
665
741
}
666
742
if(ret < 0 ){
667
743
int e = errno;
671
747
}
672
748
if(ret == 0){
673
749
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
751
errno = e;
676
752
goto mandos_end;
677
753
}
678
754
if(af == AF_INET6){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
686
758
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
689
761
errno = EINVAL;
690
762
goto mandos_end;
691
763
}
692
764
/* Set the network interface number as scope */
693
to.in6.sin6_scope_id = (uint32_t)if_index;
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
694
766
}
695
767
} else {
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
699
769
}
700
770
701
771
if(quit_now){
709
779
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
780
perror_plus("if_indextoname");
711
781
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
714
784
}
715
785
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
718
788
}
719
789
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
790
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
721
const char *pcret;
722
791
if(af == AF_INET6){
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
724
sizeof(addrstr));
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
725
796
} else {
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
727
sizeof(addrstr));
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
728
801
}
729
if(pcret == NULL){
730
perror_plus("inet_ntop");
731
} else {
732
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
734
}
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);
735
808
}
736
809
}
737
810
741
814
}
742
815
743
816
if(af == AF_INET6){
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
745
819
} else {
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
747
822
}
748
823
if(ret < 0){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
825
int e = errno;
751
826
perror_plus("connect");
752
827
errno = e;
764
839
while(true){
765
840
size_t out_size = strlen(out);
766
841
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
842
out_size - written));
768
843
if(ret == -1){
769
844
int e = errno;
770
845
perror_plus("write");
790
865
}
791
866
792
867
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
869
}
795
870
796
871
if(quit_now){
798
873
goto mandos_end;
799
874
}
800
875
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
803
881
804
882
if(quit_now){
805
883
errno = EINTR;
816
894
817
895
if(ret != GNUTLS_E_SUCCESS){
818
896
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
898
gnutls_perror(ret);
821
899
}
822
900
errno = EPROTO;
826
904
/* Read OpenPGP packet that contains the wanted password */
827
905
828
906
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
908
" %s\n", ip);
831
909
}
832
910
833
911
while(true){
838
916
}
839
917
840
918
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
919
buffer_capacity);
842
920
if(buffer_capacity == 0){
843
921
int e = errno;
844
922
perror_plus("incbuffer");
871
949
}
872
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
951
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
953
"***\n");
875
954
gnutls_perror(ret);
876
955
errno = EPROTO;
877
956
goto mandos_end;
878
957
}
879
958
break;
880
959
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
883
962
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
963
errno = EIO;
885
964
goto mandos_end;
890
969
}
891
970
892
971
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
972
fprintf_plus(stderr, "Closing TLS session\n");
894
973
}
895
974
896
975
if(quit_now){
908
987
909
988
if(buffer_length > 0){
910
989
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
913
&decrypted_buffer);
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
914
992
if(decrypted_buffer_size >= 0){
915
993
916
994
written = 0;
926
1004
if(ret == 0 and ferror(stdout)){
927
1005
int e = errno;
928
1006
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1008
strerror(errno));
931
1009
}
932
1010
errno = e;
933
1011
goto mandos_end;
964
1042
return retval;
965
1043
}
966
1044
1045
__attribute__((nonnull))
967
1046
static void resolve_callback(AvahiSServiceResolver *r,
968
1047
AvahiIfIndex interface,
969
1048
AvahiProtocol proto,
977
1056
AVAHI_GCC_UNUSED AvahiStringList *txt,
978
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
979
1058
flags,
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
1059
void *mc){
1060
if(r == NULL){
1061
return;
1062
}
982
1063
983
1064
/* Called whenever a service has been resolved successfully or
984
1065
timed out */
990
1071
switch(event){
991
1072
default:
992
1073
case AVAHI_RESOLVER_FAILURE:
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
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)));
996
1079
break;
997
1080
998
1081
case AVAHI_RESOLVER_FOUND:
1000
1083
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1084
avahi_address_snprint(ip, sizeof(ip), address);
1002
1085
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
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);
1006
1089
}
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1090
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
interface,
1092
avahi_proto_to_af(proto),
1093
mc);
1009
1094
if(ret == 0){
1010
avahi_simple_poll_quit(mc.simple_poll);
1095
avahi_simple_poll_quit(simple_poll);
1011
1096
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
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
}
1014
1103
}
1015
1104
}
1016
1105
}
1026
1115
const char *domain,
1027
1116
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1028
1117
flags,
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
1118
void *mc){
1119
if(b == NULL){
1120
return;
1121
}
1031
1122
1032
1123
/* Called whenever a new services becomes available on the LAN or
1033
1124
is removed from the LAN */
1040
1131
default:
1041
1132
case AVAHI_BROWSER_FAILURE:
1042
1133
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
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);
1046
1138
return;
1047
1139
1048
1140
case AVAHI_BROWSER_NEW:
1051
1143
the callback function is called the Avahi server will free the
1052
1144
resolver for us. */
1053
1145
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
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)));
1059
1154
break;
1060
1155
1061
1156
case AVAHI_BROWSER_REMOVE:
1064
1159
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1160
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1161
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1162
fprintf_plus(stderr, "No Mandos server found, still"
1163
" searching...\n");
1068
1164
}
1069
1165
break;
1070
1166
}
1079
1175
signal_received = sig;
1080
1176
int old_errno = errno;
1081
1177
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1084
1180
}
1085
1181
errno = old_errno;
1086
1182
}
1087
1183
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){
1199
if(debug){
1200
ret_errno = errno;
1201
perror_plus("ioctl SIOCGIFFLAGS");
1202
errno = ret_errno;
1203
}
1204
return false;
1205
}
1206
return true;
1207
}
1208
1209
__attribute__((nonnull, warn_unused_result))
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1211
1212
/* Reject the loopback device */
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1214
if(debug){
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1216
ifname);
1217
}
1218
return false;
1219
}
1220
/* Accept point-to-point devices only if connect_to is specified */
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1222
if(debug){
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1225
}
1226
return true;
1227
}
1228
/* Otherwise, reject non-broadcast-capable devices */
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1233
}
1234
return false;
1235
}
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1237
if(ifr->ifr_flags & IFF_NOARP){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1240
ifname);
1241
}
1242
return false;
1243
}
1244
1245
/* Accept this device */
1246
if(debug){
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1248
}
1249
return true;
1250
}
1251
1088
1252
/*
1089
1253
* This function determines if a directory entry in /sys/class/net
1090
1254
* corresponds to an acceptable network device.
1091
1255
* (This function is passed to scandir(3) as a filter function.)
1092
1256
*/
1257
__attribute__((nonnull, warn_unused_result))
1093
1258
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
1259
if(if_entry->d_name[0] == '.'){
1097
1260
return 0;
1098
1261
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1144
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1147
}
1148
free(flagstring);
1149
return 0;
1150
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1155
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1158
}
1159
return 0;
1160
}
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 1;
1168
}
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1171
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1174
}
1175
return 0;
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
/* Accept this device */
1186
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
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;
1189
1274
}
1190
1275
return 1;
1191
1276
}
1192
1277
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))
1193
1313
int notdotentries(const struct dirent *direntry){
1194
1314
/* Skip "." and ".." */
1195
1315
if(direntry->d_name[0] == '.'
1201
1321
return 1;
1202
1322
}
1203
1323
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
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){
1205
1390
int ret;
1206
1391
struct timespec now;
1207
1392
struct timespec waited_time;
1208
1393
intmax_t block_time;
1209
1394
1210
1395
while(true){
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1396
if(mc->current_server == NULL){
1397
if(debug){
1398
fprintf_plus(stderr, "Wait until first server is found."
1399
" No timeout!\n");
1215
1400
}
1216
1401
ret = avahi_simple_poll_iterate(s, -1);
1217
1402
} else {
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1403
if(debug){
1404
fprintf_plus(stderr, "Check current_server if we should run"
1405
" it, or wait\n");
1221
1406
}
1222
1407
/* the current time */
1223
1408
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1228
1413
/* Calculating in ms how long time between now and server
1229
1414
who we visted longest time ago. Now - last seen. */
1230
1415
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1416
- mc->current_server->last_seen.tv_sec);
1232
1417
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1418
- mc->current_server->last_seen.tv_nsec);
1234
1419
/* total time is 10s/10,000ms.
1235
1420
Converting to s from ms by dividing by 1,000,
1236
1421
and ns to ms by dividing by 1,000,000. */
1238
1423
- ((intmax_t)waited_time.tv_sec * 1000))
1239
1424
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1425
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1426
if(debug){
1427
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1428
block_time);
1243
1429
}
1244
1430
1245
1431
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
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);
1250
1436
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1437
avahi_simple_poll_quit(s);
1252
1438
return 0;
1253
1439
}
1254
1440
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1441
&mc->current_server->last_seen);
1256
1442
if(ret == -1){
1257
1443
perror_plus("clock_gettime");
1258
1444
return -1;
1259
1445
}
1260
mc.current_server = mc.current_server->next;
1446
mc->current_server = mc->current_server->next;
1261
1447
block_time = 0; /* Call avahi to find new Mandos
1262
1448
servers, but don't block */
1263
1449
}
1265
1451
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1452
}
1267
1453
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1454
if(ret > 0 or errno != EINTR){
1269
1455
return (ret != 1) ? ret : 0;
1270
1456
}
1271
1457
}
1272
1458
}
1273
1459
}
1274
1460
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
1275
1915
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 };
1276
1920
AvahiSServiceBrowser *sb = NULL;
1277
int error;
1921
error_t ret_errno;
1278
1922
int ret;
1279
1923
intmax_t tmpmax;
1280
1924
char *tmp;
1281
1925
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
1283
struct ifreq network;
1284
int sd = -1;
1285
bool take_down_interface = false;
1286
uid_t uid;
1287
gid_t gid;
1288
char tempdir[] = "/tmp/mandosXXXXXX";
1289
bool tempdir_created = false;
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;
1290
1931
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
1932
const char *seckey = PATHDIR "/" SECKEY;
1292
1933
const char *pubkey = PATHDIR "/" PUBKEY;
1934
char *interfaces_hooks = NULL;
1293
1935
1294
1936
bool gnutls_initialized = false;
1295
1937
bool gpgme_initialized = false;
1357
1999
.group = 2 },
1358
2000
{ .name = "retry", .key = 132,
1359
2001
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
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",
1361
2007
.group = 2 },
1362
2008
/*
1363
2009
* These reproduce what we would get without ARGP_NO_HELP
1382
2028
connect_to = arg;
1383
2029
break;
1384
2030
case 'i': /* --interface */
1385
interface = arg;
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
}
1386
2036
break;
1387
2037
case 's': /* --seckey */
1388
2038
seckey = arg;
1417
2067
argp_error(state, "Bad retry interval");
1418
2068
}
1419
2069
break;
2070
case 133: /* --network-hook-dir */
2071
hookdir = arg;
2072
break;
1420
2073
/*
1421
2074
* These reproduce what we would get without ARGP_NO_HELP
1422
2075
*/
1428
2081
argp_state_help(state, state->out_stream,
1429
2082
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
2083
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
2084
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
2085
exit(argp_err_exit_status);
1433
2086
break;
1434
2087
default:
1461
2114
{
1462
2115
/* Work around Debian bug #633582:
1463
2116
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1466
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
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);
1519
2207
}
1520
2208
1521
2209
if(not debug){
1522
2210
avahi_set_log_function(empty_log);
1523
2211
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1546
goto end;
1547
}
1548
}
1549
2212
1550
2213
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
2214
from the signal handler */
1552
2215
/* Initialize the pseudo-RNG for Avahi */
1553
2216
srand((unsigned int) time(NULL));
1554
mc.simple_poll = avahi_simple_poll_new();
1555
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
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");
1557
2221
exitcode = EX_UNAVAILABLE;
1558
2222
goto end;
1559
2223
}
1621
2285
}
1622
2286
}
1623
2287
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
#ifdef __linux__
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1649
if(ret == -1){
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1652
}
1653
#endif /* __linux__ */
1654
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1659
#ifdef __linux__
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1662
if(ret == -1){
1663
perror_plus("klogctl");
1664
}
1665
}
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
goto end;
1674
}
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1682
if(ret == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1694
goto end;
1695
}
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1704
#ifdef __linux__
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
perror_plus("klogctl");
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);
2310
} 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;
1709
2335
}
1710
2336
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
goto end;
1719
}
1720
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1728
2337
break;
1729
2338
}
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1734
}
1735
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
}
1743
#ifdef __linux__
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1747
if(ret == -1){
1748
perror_plus("klogctl");
1749
}
1750
}
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
1766
}
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);
1767
2366
}
1768
2367
1769
2368
if(quit_now){
1770
2369
goto end;
1771
2370
}
1772
2371
1773
ret = init_gnutls_global(pubkey, seckey);
2372
ret = init_gnutls_global(pubkey, seckey, &mc);
1774
2373
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
2374
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2375
exitcode = EX_UNAVAILABLE;
1777
2376
goto end;
1778
2377
} else {
1783
2382
goto end;
1784
2383
}
1785
2384
1786
if(mkdtemp(tempdir) == NULL){
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){
1787
2395
perror_plus("mkdtemp");
1788
2396
goto end;
1789
2397
}
1790
tempdir_created = true;
1791
2398
1792
2399
if(quit_now){
1793
2400
goto end;
1794
2401
}
1795
2402
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2403
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2404
fprintf_plus(stderr, "init_gpgme failed\n");
1798
2405
exitcode = EX_UNAVAILABLE;
1799
2406
goto end;
1800
2407
} else {
1809
2416
/* Connect directly, do not use Zeroconf */
1810
2417
/* (Mainly meant for debugging) */
1811
2418
char *address = strrchr(connect_to, ':');
2419
1812
2420
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
2421
fprintf_plus(stderr, "No colon in address\n");
1814
2422
exitcode = EX_USAGE;
1815
2423
goto end;
1816
2424
}
1819
2427
goto end;
1820
2428
}
1821
2429
1822
uint16_t port;
2430
in_port_t port;
1823
2431
errno = 0;
1824
2432
tmpmax = strtoimax(address+1, &tmp, 10);
1825
2433
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2434
or tmpmax != (in_port_t)tmpmax){
2435
fprintf_plus(stderr, "Bad port number\n");
1828
2436
exitcode = EX_USAGE;
1829
2437
goto end;
1830
2438
}
1831
2439
1832
2440
if(quit_now){
1833
2441
goto end;
1834
2442
}
1835
2443
1836
port = (uint16_t)tmpmax;
2444
port = (in_port_t)tmpmax;
1837
2445
*address = '\0';
1838
2446
/* Colon in address indicates IPv6 */
1839
2447
int af;
1855
2463
}
1856
2464
1857
2465
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
2466
ret = start_mandos_communication(address, port, if_index, af,
2467
&mc);
1859
2468
if(quit_now or ret == 0){
1860
2469
break;
1861
2470
}
1862
2471
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2472
fprintf_plus(stderr, "Retrying in %d seconds\n",
2473
(int)retry_interval);
1865
2474
}
1866
sleep((int)retry_interval);
2475
sleep((unsigned int)retry_interval);
1867
2476
}
1868
2477
1869
if (not quit_now){
2478
if(not quit_now){
1870
2479
exitcode = EXIT_SUCCESS;
1871
2480
}
1872
2481
1873
2482
goto end;
1874
2483
}
1875
2484
1887
2496
config.publish_domain = 0;
1888
2497
1889
2498
/* Allocate a new server */
1890
mc.server = avahi_server_new(avahi_simple_poll_get
1891
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
2499
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2500
&config, NULL, NULL, &ret_errno);
1893
2501
1894
2502
/* Free the Avahi configuration data */
1895
2503
avahi_server_config_free(&config);
1897
2505
1898
2506
/* Check if creating the Avahi server object succeeded */
1899
2507
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2508
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2509
avahi_strerror(ret_errno));
1902
2510
exitcode = EX_UNAVAILABLE;
1903
2511
goto end;
1904
2512
}
1910
2518
/* Create the Avahi service browser */
1911
2519
sb = avahi_s_service_browser_new(mc.server, if_index,
1912
2520
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
NULL, 0, browse_callback, NULL);
2521
NULL, 0, browse_callback,
2522
(void *)&mc);
1914
2523
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2524
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2525
avahi_strerror(avahi_server_errno(mc.server)));
1917
2526
exitcode = EX_UNAVAILABLE;
1918
2527
goto end;
1919
2528
}
1925
2534
/* Run the main loop */
1926
2535
1927
2536
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
2537
fprintf_plus(stderr, "Starting Avahi loop search\n");
1929
2538
}
1930
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
2539
2540
ret = avahi_loop_with_timeout(simple_poll,
2541
(int)(retry_interval * 1000), &mc);
1933
2542
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2543
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2544
(ret == 0) ? "successfully" : "with error");
1936
2545
}
1937
2546
1938
2547
end:
1939
2548
1940
2549
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2550
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1942
2551
}
1943
2552
1944
2553
/* Cleanup things */
2554
free(mc.interfaces);
2555
1945
2556
if(sb != NULL)
1946
2557
avahi_s_service_browser_free(sb);
1947
2558
1948
2559
if(mc.server != NULL)
1949
2560
avahi_server_free(mc.server);
1950
2561
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
2562
if(simple_poll != NULL)
2563
avahi_simple_poll_free(simple_poll);
1953
2564
1954
2565
if(gnutls_initialized){
1955
2566
gnutls_certificate_free_credentials(mc.cred);
1960
2571
if(gpgme_initialized){
1961
2572
gpgme_release(mc.ctx);
1962
2573
}
1963
2574
1964
2575
/* Cleans up the circular linked list of Mandos servers the client
1965
2576
has seen */
1966
2577
if(mc.current_server != NULL){
1972
2583
}
1973
2584
}
1974
2585
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
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
}
1982
2614
}
1983
if(geteuid() == 0){
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1992
}
1993
}
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2615
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
2618
perror_plus("Failed to lower privileges permanently");
2004
2619
}
2005
2620
}
2006
2621
2622
free(interfaces_to_take_down);
2623
free(interfaces_hooks);
2624
2007
2625
/* Removes the GPGME temp directory and all files inside */
2008
if(tempdir_created){
2626
if(tempdir != NULL){
2009
2627
struct dirent **direntries = NULL;
2010
2628
struct dirent *direntry = NULL;
2011
2629
int numentries = scandir(tempdir, &direntries, notdotentries,
2012
2630
alphasort);
2013
if (numentries > 0){
2631
if(numentries > 0){
2014
2632
for(int i = 0; i < numentries; i++){
2015
2633
direntry = direntries[i];
2016
2634
char *fullname = NULL;
2022
2640
}
2023
2641
ret = remove(fullname);
2024
2642
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2643
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2644
strerror(errno));
2027
2645
}
2028
2646
free(fullname);
2029
2647
}
2030
2648
}
2031
2649
2032
2650
/* need to clean even if 0 because man page doesn't specify */
2033
2651
free(direntries);
2034
if (numentries == -1){
2652
if(numentries == -1){
2035
2653
perror_plus("scandir");
2036
2654
}
2037
2655
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0