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- Committer: Teddy Hogeborn
- Date: 2014-07-12 13:13:28 UTC
- Revision ID: teddy@recompile.se-20140712131328-gdkvcea7f9rov7bn
mandos-client: Fix minor memory leak on memory full or clock failure.
* plugins.d/mandos-client.c (add_server): On any errors, free
new_server and its contents
before returning.
* plugins.d/mandos-client.c (add_server): On any errors, free
new_server and its contents
before returning.
- 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
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
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() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
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
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
85
86
raise() */
86
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
88
98
89
99
#ifdef __linux__
90
100
#include <sys/klog.h> /* klogctl() */
108
118
init_gnutls_session(),
109
119
GNUTLS_* */
110
120
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
113
123
114
124
/* GPGME */
115
125
#include <gpgme.h> /* All GPGME types, constants and
123
133
#define PATHDIR "/conf/conf.d/mandos"
124
134
#define SECKEY "seckey.txt"
125
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
137
127
138
bool debug = false;
128
139
static const char mandos_protocol_version[] = "1";
130
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
142
static const char sys_class_net[] = "/sys/class/net";
132
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
133
148
134
149
/* Doubly linked list that need to be circularly linked when used */
135
150
typedef struct server{
136
151
const char *ip;
137
uint16_t port;
152
in_port_t port;
138
153
AvahiIfIndex if_index;
139
154
int af;
140
155
struct timespec last_seen;
144
159
145
160
/* Used for passing in values through the Avahi callback functions */
146
161
typedef struct {
147
AvahiSimplePoll *simple_poll;
148
162
AvahiServer *server;
149
163
gnutls_certificate_credentials_t cred;
150
164
unsigned int dh_bits;
152
166
const char *priority;
153
167
gpgme_ctx_t ctx;
154
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
155
171
} mandos_context;
156
172
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 };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
162
175
163
176
sig_atomic_t quit_now = 0;
164
177
int signal_received = 0;
165
178
166
179
/* Function to use when printing errors */
167
180
void perror_plus(const char *print_text){
181
int e = errno;
168
182
fprintf(stderr, "Mandos plugin %s: ",
169
183
program_invocation_short_name);
184
errno = e;
170
185
perror(print_text);
171
186
}
172
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
173
198
/*
174
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
200
* bytes. "buffer_capacity" is how much is currently allocated,
176
201
* "buffer_length" is how much is already used.
177
202
*/
203
__attribute__((nonnull, warn_unused_result))
178
204
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
205
size_t buffer_capacity){
180
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
183
213
return 0;
184
214
}
215
*buffer = new_buf;
185
216
buffer_capacity += BUFFER_SIZE;
186
217
}
187
218
return buffer_capacity;
188
219
}
189
220
190
221
/* 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){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
194
225
int ret;
195
226
server *new_server = malloc(sizeof(server));
196
227
if(new_server == NULL){
197
228
perror_plus("malloc");
198
return -1;
229
return false;
199
230
}
200
231
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
232
.port = port,
233
.if_index = if_index,
234
.af = af };
204
235
if(new_server->ip == NULL){
205
236
perror_plus("strdup");
206
return -1;
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
free(new_server->ip);
244
free(new_server);
245
return false;
207
246
}
208
247
/* Special case of first server */
209
if (mc.current_server == NULL){
248
if(*current_server == NULL){
210
249
new_server->next = new_server;
211
250
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
251
*current_server = new_server;
214
252
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
253
/* Place the new server last in the list */
254
new_server->next = *current_server;
255
new_server->prev = (*current_server)->prev;
217
256
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;
257
(*current_server)->prev = new_server;
258
}
259
return true;
226
260
}
227
261
228
262
/*
229
263
* Initialize GPGME.
230
264
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
265
__attribute__((nonnull, warn_unused_result))
266
static bool init_gpgme(const char * const seckey,
267
const char * const pubkey,
268
const char * const tempdir,
269
mandos_context *mc){
233
270
gpgme_error_t rc;
234
271
gpgme_engine_info_t engine_info;
235
272
236
237
273
/*
238
274
* Helper function to insert pub and seckey to the engine keyring.
239
275
*/
240
bool import_key(const char *filename){
276
bool import_key(const char * const filename){
241
277
int ret;
242
278
int fd;
243
279
gpgme_data_t pgp_data;
250
286
251
287
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
288
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));
289
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
255
291
return false;
256
292
}
257
293
258
rc = gpgme_op_import(mc.ctx, pgp_data);
294
rc = gpgme_op_import(mc->ctx, pgp_data);
259
295
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
262
298
return false;
263
299
}
264
300
271
307
}
272
308
273
309
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
310
fprintf_plus(stderr, "Initializing GPGME\n");
275
311
}
276
312
277
313
/* Init GPGME */
278
314
gpgme_check_version(NULL);
279
315
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
316
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
317
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
318
gpgme_strsource(rc), gpgme_strerror(rc));
283
319
return false;
284
320
}
285
321
286
322
/* Set GPGME home directory for the OpenPGP engine only */
287
323
rc = gpgme_get_engine_info(&engine_info);
288
324
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
325
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
326
gpgme_strsource(rc), gpgme_strerror(rc));
291
327
return false;
292
328
}
293
329
while(engine_info != NULL){
299
335
engine_info = engine_info->next;
300
336
}
301
337
if(engine_info == NULL){
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
338
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
339
tempdir);
303
340
return false;
304
341
}
305
342
306
343
/* Create new GPGME "context" */
307
rc = gpgme_new(&(mc.ctx));
344
rc = gpgme_new(&(mc->ctx));
308
345
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
346
fprintf_plus(stderr, "Mandos plugin mandos-client: "
347
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
348
gpgme_strerror(rc));
311
349
return false;
312
350
}
313
351
322
360
* Decrypt OpenPGP data.
323
361
* Returns -1 on error
324
362
*/
363
__attribute__((nonnull, warn_unused_result))
325
364
static ssize_t pgp_packet_decrypt(const char *cryptotext,
326
365
size_t crypto_size,
327
char **plaintext){
366
char **plaintext,
367
mandos_context *mc){
328
368
gpgme_data_t dh_crypto, dh_plain;
329
369
gpgme_error_t rc;
330
370
ssize_t ret;
332
372
ssize_t plaintext_length = 0;
333
373
334
374
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
375
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
376
}
337
377
338
378
/* Create new GPGME data buffer from memory cryptotext */
339
379
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
380
0);
341
381
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));
382
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
344
384
return -1;
345
385
}
346
386
347
387
/* Create new empty GPGME data buffer for the plaintext */
348
388
rc = gpgme_data_new(&dh_plain);
349
389
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
390
fprintf_plus(stderr, "Mandos plugin mandos-client: "
391
"bad gpgme_data_new: %s: %s\n",
392
gpgme_strsource(rc), gpgme_strerror(rc));
352
393
gpgme_data_release(dh_crypto);
353
394
return -1;
354
395
}
355
396
356
397
/* Decrypt data from the cryptotext data buffer to the plaintext
357
398
data buffer */
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
399
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
400
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
401
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
402
gpgme_strsource(rc), gpgme_strerror(rc));
362
403
plaintext_length = -1;
363
404
if(debug){
364
405
gpgme_decrypt_result_t result;
365
result = gpgme_op_decrypt_result(mc.ctx);
406
result = gpgme_op_decrypt_result(mc->ctx);
366
407
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
408
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
409
} 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);
410
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
411
result->unsupported_algorithm);
412
fprintf_plus(stderr, "Wrong key usage: %u\n",
413
result->wrong_key_usage);
373
414
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
415
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
416
}
376
417
gpgme_recipient_t recipient;
377
418
recipient = result->recipients;
378
419
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");
420
fprintf_plus(stderr, "Public key algorithm: %s\n",
421
gpgme_pubkey_algo_name
422
(recipient->pubkey_algo));
423
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
424
fprintf_plus(stderr, "Secret key available: %s\n",
425
recipient->status == GPG_ERR_NO_SECKEY
426
? "No" : "Yes");
385
427
recipient = recipient->next;
386
428
}
387
429
}
390
432
}
391
433
392
434
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
435
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
436
}
395
437
396
438
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
445
*plaintext = NULL;
404
446
while(true){
405
447
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
448
(size_t)plaintext_length,
449
plaintext_capacity);
408
450
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
451
perror_plus("incbuffer");
452
plaintext_length = -1;
453
goto decrypt_end;
412
454
}
413
455
414
456
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
469
}
428
470
429
471
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
472
fprintf_plus(stderr, "Decrypted password is: ");
431
473
for(ssize_t i = 0; i < plaintext_length; i++){
432
474
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
475
}
444
486
return plaintext_length;
445
487
}
446
488
447
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
489
__attribute__((warn_unused_result))
490
static const char *safer_gnutls_strerror(int value){
491
const char *ret = gnutls_strerror(value);
450
492
if(ret == NULL)
451
493
ret = "(unknown)";
452
494
return ret;
453
495
}
454
496
455
497
/* GnuTLS log function callback */
498
__attribute__((nonnull))
456
499
static void debuggnutls(__attribute__((unused)) int level,
457
500
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
501
fprintf_plus(stderr, "GnuTLS: %s", string);
459
502
}
460
503
504
__attribute__((nonnull, warn_unused_result))
461
505
static int init_gnutls_global(const char *pubkeyfilename,
462
const char *seckeyfilename){
506
const char *seckeyfilename,
507
mandos_context *mc){
463
508
int ret;
464
509
465
510
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
511
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
512
}
468
513
469
514
ret = gnutls_global_init();
470
515
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
516
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
517
safer_gnutls_strerror(ret));
473
518
return -1;
474
519
}
475
520
482
527
}
483
528
484
529
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
530
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
531
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
532
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
533
safer_gnutls_strerror(ret));
489
534
gnutls_global_deinit();
490
535
return -1;
491
536
}
492
537
493
538
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
539
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
540
" secret key %s as GnuTLS credentials\n",
541
pubkeyfilename,
542
seckeyfilename);
497
543
}
498
544
499
545
ret = gnutls_certificate_set_openpgp_key_file
500
(mc.cred, pubkeyfilename, seckeyfilename,
546
(mc->cred, pubkeyfilename, seckeyfilename,
501
547
GNUTLS_OPENPGP_FMT_BASE64);
502
548
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));
549
fprintf_plus(stderr,
550
"Error[%d] while reading the OpenPGP key pair ('%s',"
551
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
552
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
553
safer_gnutls_strerror(ret));
508
554
goto globalfail;
509
555
}
510
556
511
557
/* GnuTLS server initialization */
512
ret = gnutls_dh_params_init(&mc.dh_params);
558
ret = gnutls_dh_params_init(&mc->dh_params);
513
559
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
560
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
561
" initialization: %s\n",
562
safer_gnutls_strerror(ret));
516
563
goto globalfail;
517
564
}
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
565
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
519
566
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
safer_gnutls_strerror(ret));
522
569
goto globalfail;
523
570
}
524
571
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
572
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
526
573
527
574
return 0;
528
575
529
576
globalfail:
530
577
531
gnutls_certificate_free_credentials(mc.cred);
578
gnutls_certificate_free_credentials(mc->cred);
532
579
gnutls_global_deinit();
533
gnutls_dh_params_deinit(mc.dh_params);
580
gnutls_dh_params_deinit(mc->dh_params);
534
581
return -1;
535
582
}
536
583
537
static int init_gnutls_session(gnutls_session_t *session){
584
__attribute__((nonnull, warn_unused_result))
585
static int init_gnutls_session(gnutls_session_t *session,
586
mandos_context *mc){
538
587
int ret;
539
588
/* GnuTLS session creation */
540
589
do {
544
593
}
545
594
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
595
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
596
fprintf_plus(stderr,
597
"Error in GnuTLS session initialization: %s\n",
598
safer_gnutls_strerror(ret));
549
599
}
550
600
551
601
{
552
602
const char *err;
553
603
do {
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
604
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
605
if(quit_now){
556
606
gnutls_deinit(*session);
557
607
return -1;
558
608
}
559
609
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
610
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));
611
fprintf_plus(stderr, "Syntax error at: %s\n", err);
612
fprintf_plus(stderr, "GnuTLS error: %s\n",
613
safer_gnutls_strerror(ret));
564
614
gnutls_deinit(*session);
565
615
return -1;
566
616
}
568
618
569
619
do {
570
620
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
571
mc.cred);
621
mc->cred);
572
622
if(quit_now){
573
623
gnutls_deinit(*session);
574
624
return -1;
575
625
}
576
626
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
627
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
628
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
629
safer_gnutls_strerror(ret));
580
630
gnutls_deinit(*session);
581
631
return -1;
582
632
}
584
634
/* ignore client certificate if any. */
585
635
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
586
636
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
637
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
588
638
589
639
return 0;
590
640
}
594
644
__attribute__((unused)) const char *txt){}
595
645
596
646
/* Called when a Mandos server is found */
597
static int start_mandos_communication(const char *ip, uint16_t port,
647
__attribute__((nonnull, warn_unused_result))
648
static int start_mandos_communication(const char *ip, in_port_t port,
598
649
AvahiIfIndex if_index,
599
int af){
650
int af, mandos_context *mc){
600
651
int ret, tcp_sd = -1;
601
652
ssize_t sret;
602
union {
603
struct sockaddr_in in;
604
struct sockaddr_in6 in6;
605
} to;
653
struct sockaddr_storage to;
606
654
char *buffer = NULL;
607
655
char *decrypted_buffer = NULL;
608
656
size_t buffer_length = 0;
627
675
pf = PF_INET;
628
676
break;
629
677
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
678
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
679
errno = EINVAL;
632
680
return -1;
633
681
}
634
682
635
ret = init_gnutls_session(&session);
683
/* If the interface is specified and we have a list of interfaces */
684
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
685
/* Check if the interface is one of the interfaces we are using */
686
bool match = false;
687
{
688
char *interface = NULL;
689
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
690
interface))){
691
if(if_nametoindex(interface) == (unsigned int)if_index){
692
match = true;
693
break;
694
}
695
}
696
}
697
if(not match){
698
/* This interface does not match any in the list, so we don't
699
connect to the server */
700
if(debug){
701
char interface[IF_NAMESIZE];
702
if(if_indextoname((unsigned int)if_index, interface) == NULL){
703
perror_plus("if_indextoname");
704
} else {
705
fprintf_plus(stderr, "Skipping server on non-used interface"
706
" \"%s\"\n",
707
if_indextoname((unsigned int)if_index,
708
interface));
709
}
710
}
711
return -1;
712
}
713
}
714
715
ret = init_gnutls_session(&session, mc);
636
716
if(ret != 0){
637
717
return -1;
638
718
}
639
719
640
720
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
721
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
722
PRIuMAX "\n", ip, (uintmax_t)port);
643
723
}
644
724
645
725
tcp_sd = socket(pf, SOCK_STREAM, 0);
657
737
658
738
memset(&to, 0, sizeof(to));
659
739
if(af == AF_INET6){
660
to.in6.sin6_family = (sa_family_t)af;
661
ret = inet_pton(af, ip, &to.in6.sin6_addr);
740
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
662
742
} else { /* IPv4 */
663
to.in.sin_family = (sa_family_t)af;
664
ret = inet_pton(af, ip, &to.in.sin_addr);
743
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
744
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
665
745
}
666
746
if(ret < 0 ){
667
747
int e = errno;
671
751
}
672
752
if(ret == 0){
673
753
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
754
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
755
errno = e;
676
756
goto mandos_end;
677
757
}
678
758
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*/
759
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
760
if(IN6_IS_ADDR_LINKLOCAL
761
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
686
762
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
763
fprintf_plus(stderr, "An IPv6 link-local address is"
764
" incomplete without a network interface\n");
689
765
errno = EINVAL;
690
766
goto mandos_end;
691
767
}
692
768
/* Set the network interface number as scope */
693
to.in6.sin6_scope_id = (uint32_t)if_index;
769
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
694
770
}
695
771
} else {
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
772
((struct sockaddr_in *)&to)->sin_port = htons(port);
699
773
}
700
774
701
775
if(quit_now){
709
783
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
784
perror_plus("if_indextoname");
711
785
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
786
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
787
"\n", ip, interface, (uintmax_t)port);
714
788
}
715
789
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
790
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
791
ip, (uintmax_t)port);
718
792
}
719
793
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
794
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
721
const char *pcret;
722
795
if(af == AF_INET6){
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
724
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in6),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
725
800
} else {
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
727
sizeof(addrstr));
801
ret = getnameinfo((struct sockaddr *)&to,
802
sizeof(struct sockaddr_in),
803
addrstr, sizeof(addrstr), NULL, 0,
804
NI_NUMERICHOST);
728
805
}
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
}
806
if(ret == EAI_SYSTEM){
807
perror_plus("getnameinfo");
808
} else if(ret != 0) {
809
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
810
} else if(strcmp(addrstr, ip) != 0){
811
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
735
812
}
736
813
}
737
814
741
818
}
742
819
743
820
if(af == AF_INET6){
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
821
ret = connect(tcp_sd, (struct sockaddr *)&to,
822
sizeof(struct sockaddr_in6));
745
823
} else {
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
824
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
825
sizeof(struct sockaddr_in));
747
826
}
748
827
if(ret < 0){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
828
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
829
int e = errno;
751
830
perror_plus("connect");
752
831
errno = e;
764
843
while(true){
765
844
size_t out_size = strlen(out);
766
845
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
846
out_size - written));
768
847
if(ret == -1){
769
848
int e = errno;
770
849
perror_plus("write");
790
869
}
791
870
792
871
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
872
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
873
}
795
874
796
875
if(quit_now){
798
877
goto mandos_end;
799
878
}
800
879
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
880
/* This casting via intptr_t is to eliminate warning about casting
881
an int to a pointer type. This is exactly how the GnuTLS Guile
882
function "set-session-transport-fd!" does it. */
883
gnutls_transport_set_ptr(session,
884
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
803
885
804
886
if(quit_now){
805
887
errno = EINTR;
816
898
817
899
if(ret != GNUTLS_E_SUCCESS){
818
900
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
901
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
902
gnutls_perror(ret);
821
903
}
822
904
errno = EPROTO;
826
908
/* Read OpenPGP packet that contains the wanted password */
827
909
828
910
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
911
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
912
" %s\n", ip);
831
913
}
832
914
833
915
while(true){
838
920
}
839
921
840
922
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
923
buffer_capacity);
842
924
if(buffer_capacity == 0){
843
925
int e = errno;
844
926
perror_plus("incbuffer");
871
953
}
872
954
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
955
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
956
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
957
"***\n");
875
958
gnutls_perror(ret);
876
959
errno = EPROTO;
877
960
goto mandos_end;
878
961
}
879
962
break;
880
963
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
964
fprintf_plus(stderr, "Unknown error while reading data from"
965
" encrypted session with Mandos server\n");
883
966
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
967
errno = EIO;
885
968
goto mandos_end;
890
973
}
891
974
892
975
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
976
fprintf_plus(stderr, "Closing TLS session\n");
894
977
}
895
978
896
979
if(quit_now){
908
991
909
992
if(buffer_length > 0){
910
993
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
913
&decrypted_buffer);
994
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
995
&decrypted_buffer, mc);
914
996
if(decrypted_buffer_size >= 0){
915
997
916
998
written = 0;
926
1008
if(ret == 0 and ferror(stdout)){
927
1009
int e = errno;
928
1010
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
1011
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1012
strerror(errno));
931
1013
}
932
1014
errno = e;
933
1015
goto mandos_end;
964
1046
return retval;
965
1047
}
966
1048
1049
__attribute__((nonnull))
967
1050
static void resolve_callback(AvahiSServiceResolver *r,
968
1051
AvahiIfIndex interface,
969
1052
AvahiProtocol proto,
977
1060
AVAHI_GCC_UNUSED AvahiStringList *txt,
978
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
979
1062
flags,
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
1063
void *mc){
1064
if(r == NULL){
1065
return;
1066
}
982
1067
983
1068
/* Called whenever a service has been resolved successfully or
984
1069
timed out */
990
1075
switch(event){
991
1076
default:
992
1077
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)));
1078
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1079
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1080
domain,
1081
avahi_strerror(avahi_server_errno
1082
(((mandos_context*)mc)->server)));
996
1083
break;
997
1084
998
1085
case AVAHI_RESOLVER_FOUND:
1000
1087
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1088
avahi_address_snprint(ip, sizeof(ip), address);
1002
1089
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);
1090
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1091
PRIdMAX ") on port %" PRIu16 "\n", name,
1092
host_name, ip, (intmax_t)interface, port);
1006
1093
}
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1094
int ret = start_mandos_communication(ip, (in_port_t)port,
1095
interface,
1096
avahi_proto_to_af(proto),
1097
mc);
1009
1098
if(ret == 0){
1010
avahi_simple_poll_quit(mc.simple_poll);
1099
avahi_simple_poll_quit(simple_poll);
1011
1100
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1101
if(not add_server(ip, (in_port_t)port, interface,
1102
avahi_proto_to_af(proto),
1103
&((mandos_context*)mc)->current_server)){
1104
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1105
" list\n", name);
1106
}
1014
1107
}
1015
1108
}
1016
1109
}
1026
1119
const char *domain,
1027
1120
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1028
1121
flags,
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
1122
void *mc){
1123
if(b == NULL){
1124
return;
1125
}
1031
1126
1032
1127
/* Called whenever a new services becomes available on the LAN or
1033
1128
is removed from the LAN */
1040
1135
default:
1041
1136
case AVAHI_BROWSER_FAILURE:
1042
1137
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
1138
fprintf_plus(stderr, "(Avahi browser) %s\n",
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1141
avahi_simple_poll_quit(simple_poll);
1046
1142
return;
1047
1143
1048
1144
case AVAHI_BROWSER_NEW:
1051
1147
the callback function is called the Avahi server will free the
1052
1148
resolver for us. */
1053
1149
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)));
1150
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1151
interface, protocol, name, type,
1152
domain, protocol, 0,
1153
resolve_callback, mc) == NULL)
1154
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1155
" %s\n", name,
1156
avahi_strerror(avahi_server_errno
1157
(((mandos_context*)mc)->server)));
1059
1158
break;
1060
1159
1061
1160
case AVAHI_BROWSER_REMOVE:
1064
1163
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1164
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1165
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1166
fprintf_plus(stderr, "No Mandos server found, still"
1167
" searching...\n");
1068
1168
}
1069
1169
break;
1070
1170
}
1079
1179
signal_received = sig;
1080
1180
int old_errno = errno;
1081
1181
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1182
if(simple_poll != NULL){
1183
avahi_simple_poll_quit(simple_poll);
1084
1184
}
1085
1185
errno = old_errno;
1086
1186
}
1087
1187
1188
__attribute__((nonnull, warn_unused_result))
1189
bool get_flags(const char *ifname, struct ifreq *ifr){
1190
int ret;
1191
error_t ret_errno;
1192
1193
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1194
if(s < 0){
1195
ret_errno = errno;
1196
perror_plus("socket");
1197
errno = ret_errno;
1198
return false;
1199
}
1200
strcpy(ifr->ifr_name, ifname);
1201
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1202
if(ret == -1){
1203
if(debug){
1204
ret_errno = errno;
1205
perror_plus("ioctl SIOCGIFFLAGS");
1206
errno = ret_errno;
1207
}
1208
return false;
1209
}
1210
return true;
1211
}
1212
1213
__attribute__((nonnull, warn_unused_result))
1214
bool good_flags(const char *ifname, const struct ifreq *ifr){
1215
1216
/* Reject the loopback device */
1217
if(ifr->ifr_flags & IFF_LOOPBACK){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1220
ifname);
1221
}
1222
return false;
1223
}
1224
/* Accept point-to-point devices only if connect_to is specified */
1225
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1226
if(debug){
1227
fprintf_plus(stderr, "Accepting point-to-point interface"
1228
" \"%s\"\n", ifname);
1229
}
1230
return true;
1231
}
1232
/* Otherwise, reject non-broadcast-capable devices */
1233
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1234
if(debug){
1235
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1236
" \"%s\"\n", ifname);
1237
}
1238
return false;
1239
}
1240
/* Reject non-ARP interfaces (including dummy interfaces) */
1241
if(ifr->ifr_flags & IFF_NOARP){
1242
if(debug){
1243
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1244
ifname);
1245
}
1246
return false;
1247
}
1248
1249
/* Accept this device */
1250
if(debug){
1251
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1252
}
1253
return true;
1254
}
1255
1088
1256
/*
1089
1257
* This function determines if a directory entry in /sys/class/net
1090
1258
* corresponds to an acceptable network device.
1091
1259
* (This function is passed to scandir(3) as a filter function.)
1092
1260
*/
1261
__attribute__((nonnull, warn_unused_result))
1093
1262
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
1263
if(if_entry->d_name[0] == '.'){
1097
1264
return 0;
1098
1265
}
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);
1266
1267
struct ifreq ifr;
1268
if(not get_flags(if_entry->d_name, &ifr)){
1269
if(debug){
1270
fprintf_plus(stderr, "Failed to get flags for interface "
1271
"\"%s\"\n", if_entry->d_name);
1272
}
1273
return 0;
1274
}
1275
1276
if(not good_flags(if_entry->d_name, &ifr)){
1277
return 0;
1189
1278
}
1190
1279
return 1;
1191
1280
}
1192
1281
1282
/*
1283
* This function determines if a network interface is up.
1284
*/
1285
__attribute__((nonnull, warn_unused_result))
1286
bool interface_is_up(const char *interface){
1287
struct ifreq ifr;
1288
if(not get_flags(interface, &ifr)){
1289
if(debug){
1290
fprintf_plus(stderr, "Failed to get flags for interface "
1291
"\"%s\"\n", interface);
1292
}
1293
return false;
1294
}
1295
1296
return (bool)(ifr.ifr_flags & IFF_UP);
1297
}
1298
1299
/*
1300
* This function determines if a network interface is running
1301
*/
1302
__attribute__((nonnull, warn_unused_result))
1303
bool interface_is_running(const char *interface){
1304
struct ifreq ifr;
1305
if(not get_flags(interface, &ifr)){
1306
if(debug){
1307
fprintf_plus(stderr, "Failed to get flags for interface "
1308
"\"%s\"\n", interface);
1309
}
1310
return false;
1311
}
1312
1313
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1314
}
1315
1316
__attribute__((nonnull, pure, warn_unused_result))
1193
1317
int notdotentries(const struct dirent *direntry){
1194
1318
/* Skip "." and ".." */
1195
1319
if(direntry->d_name[0] == '.'
1201
1325
return 1;
1202
1326
}
1203
1327
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1328
/* Is this directory entry a runnable program? */
1329
__attribute__((nonnull, warn_unused_result))
1330
int runnable_hook(const struct dirent *direntry){
1331
int ret;
1332
size_t sret;
1333
struct stat st;
1334
1335
if((direntry->d_name)[0] == '\0'){
1336
/* Empty name? */
1337
return 0;
1338
}
1339
1340
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1341
"abcdefghijklmnopqrstuvwxyz"
1342
"0123456789"
1343
"_.-");
1344
if((direntry->d_name)[sret] != '\0'){
1345
/* Contains non-allowed characters */
1346
if(debug){
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1348
direntry->d_name);
1349
}
1350
return 0;
1351
}
1352
1353
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1354
if(ret == -1){
1355
if(debug){
1356
perror_plus("Could not stat hook");
1357
}
1358
return 0;
1359
}
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1362
if(debug){
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
direntry->d_name);
1365
}
1366
return 0;
1367
}
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1379
}
1380
return 1;
1381
}
1382
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1205
1386
int ret;
1206
1387
struct timespec now;
1207
1388
struct timespec waited_time;
1208
1389
intmax_t block_time;
1209
1390
1210
1391
while(true){
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1392
if(mc->current_server == NULL){
1393
if(debug){
1394
fprintf_plus(stderr, "Wait until first server is found."
1395
" No timeout!\n");
1215
1396
}
1216
1397
ret = avahi_simple_poll_iterate(s, -1);
1217
1398
} else {
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1399
if(debug){
1400
fprintf_plus(stderr, "Check current_server if we should run"
1401
" it, or wait\n");
1221
1402
}
1222
1403
/* the current time */
1223
1404
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1228
1409
/* Calculating in ms how long time between now and server
1229
1410
who we visted longest time ago. Now - last seen. */
1230
1411
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1412
- mc->current_server->last_seen.tv_sec);
1232
1413
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1414
- mc->current_server->last_seen.tv_nsec);
1234
1415
/* total time is 10s/10,000ms.
1235
1416
Converting to s from ms by dividing by 1,000,
1236
1417
and ns to ms by dividing by 1,000,000. */
1238
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1239
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1421
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1422
if(debug){
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
block_time);
1243
1425
}
1244
1426
1245
1427
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);
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1250
1432
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1433
avahi_simple_poll_quit(s);
1252
1434
return 0;
1253
1435
}
1254
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1437
&mc->current_server->last_seen);
1256
1438
if(ret == -1){
1257
1439
perror_plus("clock_gettime");
1258
1440
return -1;
1259
1441
}
1260
mc.current_server = mc.current_server->next;
1442
mc->current_server = mc->current_server->next;
1261
1443
block_time = 0; /* Call avahi to find new Mandos
1262
1444
servers, but don't block */
1263
1445
}
1265
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1448
}
1267
1449
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1450
if(ret > 0 or errno != EINTR){
1269
1451
return (ret != 1) ? ret : 0;
1270
1452
}
1271
1453
}
1272
1454
}
1273
1455
}
1274
1456
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
error_t raise_privileges_permanently(void){
1472
error_t old_errno = errno;
1473
error_t ret_errno = raise_privileges();
1474
if(ret_errno != 0){
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
if(setuid(0) == -1){
1479
ret_errno = errno;
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
error_t lower_privileges(void){
1488
error_t old_errno = errno;
1489
error_t ret_errno = 0;
1490
if(seteuid(uid) == -1){
1491
ret_errno = errno;
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
__attribute__((nonnull))
1510
void run_network_hooks(const char *mode, const char *interface,
1511
const float delay){
1512
struct dirent **direntries = NULL;
1513
if(hookdir_fd == -1){
1514
hookdir_fd = open(hookdir, O_RDONLY);
1515
if(hookdir_fd == -1){
1516
if(errno == ENOENT){
1517
if(debug){
1518
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1519
" found\n", hookdir);
1520
}
1521
} else {
1522
perror_plus("open");
1523
}
1524
return;
1525
}
1526
}
1527
#ifdef __GLIBC__
1528
#if __GLIBC_PREREQ(2, 15)
1529
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1530
runnable_hook, alphasort);
1531
#else /* not __GLIBC_PREREQ(2, 15) */
1532
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1533
alphasort);
1534
#endif /* not __GLIBC_PREREQ(2, 15) */
1535
#else /* not __GLIBC__ */
1536
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1537
alphasort);
1538
#endif /* not __GLIBC__ */
1539
if(numhooks == -1){
1540
perror_plus("scandir");
1541
return;
1542
}
1543
struct dirent *direntry;
1544
int ret;
1545
int devnull = open("/dev/null", O_RDONLY);
1546
for(int i = 0; i < numhooks; i++){
1547
direntry = direntries[i];
1548
if(debug){
1549
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1550
direntry->d_name);
1551
}
1552
pid_t hook_pid = fork();
1553
if(hook_pid == 0){
1554
/* Child */
1555
/* Raise privileges */
1556
errno = raise_privileges_permanently();
1557
if(errno != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1613
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1618
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
free(direntries);
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1675
perror_plus("close");
1676
} else {
1677
hookdir_fd = -1;
1678
}
1679
close(devnull);
1680
}
1681
1682
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1684
const float delay){
1685
error_t old_errno = errno;
1686
int ret;
1687
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1689
if(if_index == 0){
1690
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1691
errno = old_errno;
1692
return ENXIO;
1693
}
1694
1695
if(quit_now){
1696
errno = old_errno;
1697
return EINTR;
1698
}
1699
1700
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
1702
if(not get_flags(interface, &network)){
1703
ret_errno = errno;
1704
fprintf_plus(stderr, "Failed to get flags for interface "
1705
"\"%s\"\n", interface);
1706
errno = old_errno;
1707
return ret_errno;
1708
}
1709
network.ifr_flags |= IFF_UP; /* set flag */
1710
1711
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1712
if(sd == -1){
1713
ret_errno = errno;
1714
perror_plus("socket");
1715
errno = old_errno;
1716
return ret_errno;
1717
}
1718
1719
if(quit_now){
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1721
if(ret == -1){
1722
perror_plus("close");
1723
}
1724
errno = old_errno;
1725
return EINTR;
1726
}
1727
1728
if(debug){
1729
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1730
interface);
1731
}
1732
1733
/* Raise privileges */
1734
ret_errno = raise_privileges();
1735
if(ret_errno != 0){
1736
errno = ret_errno;
1737
perror_plus("Failed to raise privileges");
1738
}
1739
1740
#ifdef __linux__
1741
int ret_linux;
1742
bool restore_loglevel = false;
1743
if(ret_errno == 0){
1744
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1745
messages about the network interface to mess up the prompt */
1746
ret_linux = klogctl(8, NULL, 5);
1747
if(ret_linux == -1){
1748
perror_plus("klogctl");
1749
} else {
1750
restore_loglevel = true;
1751
}
1752
}
1753
#endif /* __linux__ */
1754
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1755
ioctl_errno = errno;
1756
#ifdef __linux__
1757
if(restore_loglevel){
1758
ret_linux = klogctl(7, NULL, 0);
1759
if(ret_linux == -1){
1760
perror_plus("klogctl");
1761
}
1762
}
1763
#endif /* __linux__ */
1764
1765
/* If raise_privileges() succeeded above */
1766
if(ret_errno == 0){
1767
/* Lower privileges */
1768
ret_errno = lower_privileges();
1769
if(ret_errno != 0){
1770
errno = ret_errno;
1771
perror_plus("Failed to lower privileges");
1772
}
1773
}
1774
1775
/* Close the socket */
1776
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ioctl_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1784
errno = old_errno;
1785
return ioctl_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1789
interface);
1790
}
1791
1792
/* Sleep checking until interface is running.
1793
Check every 0.25s, up to total time of delay */
1794
for(int i=0; i < delay * 4; i++){
1795
if(interface_is_running(interface)){
1796
break;
1797
}
1798
struct timespec sleeptime = { .tv_nsec = 250000000 };
1799
ret = nanosleep(&sleeptime, NULL);
1800
if(ret == -1 and errno != EINTR){
1801
perror_plus("nanosleep");
1802
}
1803
}
1804
1805
errno = old_errno;
1806
return 0;
1807
}
1808
1809
__attribute__((nonnull, warn_unused_result))
1810
error_t take_down_interface(const char *const interface){
1811
error_t old_errno = errno;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
if(interface_is_up(interface)){
1820
error_t ret_errno = 0, ioctl_errno = 0;
1821
if(not get_flags(interface, &network) and debug){
1822
ret_errno = errno;
1823
fprintf_plus(stderr, "Failed to get flags for interface "
1824
"\"%s\"\n", interface);
1825
errno = old_errno;
1826
return ret_errno;
1827
}
1828
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1829
1830
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1831
if(sd == -1){
1832
ret_errno = errno;
1833
perror_plus("socket");
1834
errno = old_errno;
1835
return ret_errno;
1836
}
1837
1838
if(debug){
1839
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1840
interface);
1841
}
1842
1843
/* Raise privileges */
1844
ret_errno = raise_privileges();
1845
if(ret_errno != 0){
1846
errno = ret_errno;
1847
perror_plus("Failed to raise privileges");
1848
}
1849
1850
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1851
ioctl_errno = errno;
1852
1853
/* If raise_privileges() succeeded above */
1854
if(ret_errno == 0){
1855
/* Lower privileges */
1856
ret_errno = lower_privileges();
1857
if(ret_errno != 0){
1858
errno = ret_errno;
1859
perror_plus("Failed to lower privileges");
1860
}
1861
}
1862
1863
/* Close the socket */
1864
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1865
if(ret == -1){
1866
perror_plus("close");
1867
}
1868
1869
if(ret_setflags == -1){
1870
errno = ioctl_errno;
1871
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1872
errno = old_errno;
1873
return ioctl_errno;
1874
}
1875
} else if(debug){
1876
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1877
interface);
1878
}
1879
1880
errno = old_errno;
1881
return 0;
1882
}
1883
1275
1884
int main(int argc, char *argv[]){
1885
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1886
.priority = "SECURE256:!CTYPE-X.509:"
1887
"+CTYPE-OPENPGP", .current_server = NULL,
1888
.interfaces = NULL, .interfaces_size = 0 };
1276
1889
AvahiSServiceBrowser *sb = NULL;
1277
int error;
1890
error_t ret_errno;
1278
1891
int ret;
1279
1892
intmax_t tmpmax;
1280
1893
char *tmp;
1281
1894
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;
1895
char *interfaces_to_take_down = NULL;
1896
size_t interfaces_to_take_down_size = 0;
1897
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1898
char old_tempdir[] = "/tmp/mandosXXXXXX";
1899
char *tempdir = NULL;
1290
1900
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
1901
const char *seckey = PATHDIR "/" SECKEY;
1292
1902
const char *pubkey = PATHDIR "/" PUBKEY;
1903
char *interfaces_hooks = NULL;
1293
1904
1294
1905
bool gnutls_initialized = false;
1295
1906
bool gpgme_initialized = false;
1357
1968
.group = 2 },
1358
1969
{ .name = "retry", .key = 132,
1359
1970
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1971
.doc = "Retry interval used when denied by the Mandos server",
1972
.group = 2 },
1973
{ .name = "network-hook-dir", .key = 133,
1974
.arg = "DIR",
1975
.doc = "Directory where network hooks are located",
1361
1976
.group = 2 },
1362
1977
/*
1363
1978
* These reproduce what we would get without ARGP_NO_HELP
1382
1997
connect_to = arg;
1383
1998
break;
1384
1999
case 'i': /* --interface */
1385
interface = arg;
2000
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2001
arg, (int)',');
2002
if(ret_errno != 0){
2003
argp_error(state, "%s", strerror(ret_errno));
2004
}
1386
2005
break;
1387
2006
case 's': /* --seckey */
1388
2007
seckey = arg;
1417
2036
argp_error(state, "Bad retry interval");
1418
2037
}
1419
2038
break;
2039
case 133: /* --network-hook-dir */
2040
hookdir = arg;
2041
break;
1420
2042
/*
1421
2043
* These reproduce what we would get without ARGP_NO_HELP
1422
2044
*/
1428
2050
argp_state_help(state, state->out_stream,
1429
2051
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
2052
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
2053
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
2054
exit(argp_err_exit_status);
1433
2055
break;
1434
2056
default:
1461
2083
{
1462
2084
/* Work around Debian bug #633582:
1463
2085
<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
}
2086
2087
/* Re-raise privileges */
2088
ret_errno = raise_privileges();
2089
if(ret_errno != 0){
2090
errno = ret_errno;
2091
perror_plus("Failed to raise privileges");
2092
} else {
2093
struct stat st;
2094
2095
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2096
int seckey_fd = open(seckey, O_RDONLY);
2097
if(seckey_fd == -1){
2098
perror_plus("open");
2099
} else {
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2101
if(ret == -1){
2102
perror_plus("fstat");
2103
} else {
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(seckey_fd, uid, gid);
2107
if(ret == -1){
2108
perror_plus("fchown");
2109
}
2110
}
2111
}
2112
TEMP_FAILURE_RETRY(close(seckey_fd));
2113
}
2114
}
2115
2116
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2117
int pubkey_fd = open(pubkey, O_RDONLY);
2118
if(pubkey_fd == -1){
2119
perror_plus("open");
2120
} else {
2121
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2122
if(ret == -1){
2123
perror_plus("fstat");
2124
} else {
2125
if(S_ISREG(st.st_mode)
2126
and st.st_uid == 0 and st.st_gid == 0){
2127
ret = fchown(pubkey_fd, uid, gid);
2128
if(ret == -1){
2129
perror_plus("fchown");
2130
}
2131
}
2132
}
2133
TEMP_FAILURE_RETRY(close(pubkey_fd));
2134
}
2135
}
2136
2137
/* Lower privileges */
2138
ret_errno = lower_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to lower privileges");
2142
}
2143
}
2144
}
2145
2146
/* Remove invalid interface names (except "none") */
2147
{
2148
char *interface = NULL;
2149
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2150
interface))){
2151
if(strcmp(interface, "none") != 0
2152
and if_nametoindex(interface) == 0){
2153
if(interface[0] != '\0'){
2154
fprintf_plus(stderr, "Not using nonexisting interface"
2155
" \"%s\"\n", interface);
2156
}
2157
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2158
interface = NULL;
2159
}
2160
}
2161
}
2162
2163
/* Run network hooks */
2164
{
2165
if(mc.interfaces != NULL){
2166
interfaces_hooks = malloc(mc.interfaces_size);
2167
if(interfaces_hooks == NULL){
2168
perror_plus("malloc");
2169
goto end;
2170
}
2171
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2172
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2173
}
2174
run_network_hooks("start", interfaces_hooks != NULL ?
2175
interfaces_hooks : "", delay);
1519
2176
}
1520
2177
1521
2178
if(not debug){
1522
2179
avahi_set_log_function(empty_log);
1523
2180
}
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
2181
1550
2182
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
2183
from the signal handler */
1552
2184
/* Initialize the pseudo-RNG for Avahi */
1553
2185
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");
2186
simple_poll = avahi_simple_poll_new();
2187
if(simple_poll == NULL){
2188
fprintf_plus(stderr,
2189
"Avahi: Failed to create simple poll object.\n");
1557
2190
exitcode = EX_UNAVAILABLE;
1558
2191
goto end;
1559
2192
}
1621
2254
}
1622
2255
}
1623
2256
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");
2257
/* If no interfaces were specified, make a list */
2258
if(mc.interfaces == NULL){
2259
struct dirent **direntries = NULL;
2260
/* Look for any good interfaces */
2261
ret = scandir(sys_class_net, &direntries, good_interface,
2262
alphasort);
2263
if(ret >= 1){
2264
/* Add all found interfaces to interfaces list */
2265
for(int i = 0; i < ret; ++i){
2266
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2267
direntries[i]->d_name);
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("argz_add");
2271
continue;
2272
}
2273
if(debug){
2274
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2275
direntries[i]->d_name);
2276
}
2277
}
2278
free(direntries);
2279
} else {
2280
if(ret == 0){
2281
free(direntries);
2282
}
2283
fprintf_plus(stderr, "Could not find a network interface\n");
2284
exitcode = EXIT_FAILURE;
2285
goto end;
2286
}
2287
}
2288
2289
/* Bring up interfaces which are down, and remove any "none"s */
2290
{
2291
char *interface = NULL;
2292
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2293
interface))){
2294
/* If interface name is "none", stop bringing up interfaces.
2295
Also remove all instances of "none" from the list */
2296
if(strcmp(interface, "none") == 0){
2297
argz_delete(&mc.interfaces, &mc.interfaces_size,
2298
interface);
2299
interface = NULL;
2300
while((interface = argz_next(mc.interfaces,
2301
mc.interfaces_size, interface))){
2302
if(strcmp(interface, "none") == 0){
2303
argz_delete(&mc.interfaces, &mc.interfaces_size,
2304
interface);
2305
interface = NULL;
1709
2306
}
1710
2307
}
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
2308
break;
1729
2309
}
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
}
2310
bool interface_was_up = interface_is_up(interface);
2311
errno = bring_up_interface(interface, delay);
2312
if(not interface_was_up){
2313
if(errno != 0){
2314
perror_plus("Failed to bring up interface");
2315
} else {
2316
errno = argz_add(&interfaces_to_take_down,
2317
&interfaces_to_take_down_size,
2318
interface);
2319
if(errno != 0){
2320
perror_plus("argz_add");
2321
}
2322
}
2323
}
2324
}
2325
if(debug and (interfaces_to_take_down == NULL)){
2326
fprintf_plus(stderr, "No interfaces were brought up\n");
2327
}
2328
}
2329
2330
/* If we only got one interface, explicitly use only that one */
2331
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2332
if(debug){
2333
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2334
mc.interfaces);
2335
}
2336
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1767
2337
}
1768
2338
1769
2339
if(quit_now){
1770
2340
goto end;
1771
2341
}
1772
2342
1773
ret = init_gnutls_global(pubkey, seckey);
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
1774
2344
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
2345
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2346
exitcode = EX_UNAVAILABLE;
1777
2347
goto end;
1778
2348
} else {
1783
2353
goto end;
1784
2354
}
1785
2355
1786
if(mkdtemp(tempdir) == NULL){
2356
/* Try /run/tmp before /tmp */
2357
tempdir = mkdtemp(run_tempdir);
2358
if(tempdir == NULL and errno == ENOENT){
2359
if(debug){
2360
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2361
run_tempdir, old_tempdir);
2362
}
2363
tempdir = mkdtemp(old_tempdir);
2364
}
2365
if(tempdir == NULL){
1787
2366
perror_plus("mkdtemp");
1788
2367
goto end;
1789
2368
}
1790
tempdir_created = true;
1791
2369
1792
2370
if(quit_now){
1793
2371
goto end;
1794
2372
}
1795
2373
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2374
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2375
fprintf_plus(stderr, "init_gpgme failed\n");
1798
2376
exitcode = EX_UNAVAILABLE;
1799
2377
goto end;
1800
2378
} else {
1809
2387
/* Connect directly, do not use Zeroconf */
1810
2388
/* (Mainly meant for debugging) */
1811
2389
char *address = strrchr(connect_to, ':');
2390
1812
2391
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
2392
fprintf_plus(stderr, "No colon in address\n");
1814
2393
exitcode = EX_USAGE;
1815
2394
goto end;
1816
2395
}
1819
2398
goto end;
1820
2399
}
1821
2400
1822
uint16_t port;
2401
in_port_t port;
1823
2402
errno = 0;
1824
2403
tmpmax = strtoimax(address+1, &tmp, 10);
1825
2404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2405
or tmpmax != (in_port_t)tmpmax){
2406
fprintf_plus(stderr, "Bad port number\n");
1828
2407
exitcode = EX_USAGE;
1829
2408
goto end;
1830
2409
}
1831
2410
1832
2411
if(quit_now){
1833
2412
goto end;
1834
2413
}
1835
2414
1836
port = (uint16_t)tmpmax;
2415
port = (in_port_t)tmpmax;
1837
2416
*address = '\0';
1838
2417
/* Colon in address indicates IPv6 */
1839
2418
int af;
1855
2434
}
1856
2435
1857
2436
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
2437
ret = start_mandos_communication(address, port, if_index, af,
2438
&mc);
1859
2439
if(quit_now or ret == 0){
1860
2440
break;
1861
2441
}
1862
2442
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2443
fprintf_plus(stderr, "Retrying in %d seconds\n",
2444
(int)retry_interval);
1865
2445
}
1866
sleep((int)retry_interval);
2446
sleep((unsigned int)retry_interval);
1867
2447
}
1868
2448
1869
if (not quit_now){
2449
if(not quit_now){
1870
2450
exitcode = EXIT_SUCCESS;
1871
2451
}
1872
2452
1873
2453
goto end;
1874
2454
}
1875
2455
1887
2467
config.publish_domain = 0;
1888
2468
1889
2469
/* Allocate a new server */
1890
mc.server = avahi_server_new(avahi_simple_poll_get
1891
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
2470
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2471
&config, NULL, NULL, &ret_errno);
1893
2472
1894
2473
/* Free the Avahi configuration data */
1895
2474
avahi_server_config_free(&config);
1897
2476
1898
2477
/* Check if creating the Avahi server object succeeded */
1899
2478
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2479
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2480
avahi_strerror(ret_errno));
1902
2481
exitcode = EX_UNAVAILABLE;
1903
2482
goto end;
1904
2483
}
1910
2489
/* Create the Avahi service browser */
1911
2490
sb = avahi_s_service_browser_new(mc.server, if_index,
1912
2491
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
NULL, 0, browse_callback, NULL);
2492
NULL, 0, browse_callback,
2493
(void *)&mc);
1914
2494
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2495
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2496
avahi_strerror(avahi_server_errno(mc.server)));
1917
2497
exitcode = EX_UNAVAILABLE;
1918
2498
goto end;
1919
2499
}
1925
2505
/* Run the main loop */
1926
2506
1927
2507
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
2508
fprintf_plus(stderr, "Starting Avahi loop search\n");
1929
2509
}
1930
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
2510
2511
ret = avahi_loop_with_timeout(simple_poll,
2512
(int)(retry_interval * 1000), &mc);
1933
2513
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2514
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2515
(ret == 0) ? "successfully" : "with error");
1936
2516
}
1937
2517
1938
2518
end:
1939
2519
1940
2520
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2521
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1942
2522
}
1943
2523
1944
2524
/* Cleanup things */
2525
free(mc.interfaces);
2526
1945
2527
if(sb != NULL)
1946
2528
avahi_s_service_browser_free(sb);
1947
2529
1948
2530
if(mc.server != NULL)
1949
2531
avahi_server_free(mc.server);
1950
2532
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
2533
if(simple_poll != NULL)
2534
avahi_simple_poll_free(simple_poll);
1953
2535
1954
2536
if(gnutls_initialized){
1955
2537
gnutls_certificate_free_credentials(mc.cred);
1960
2542
if(gpgme_initialized){
1961
2543
gpgme_release(mc.ctx);
1962
2544
}
1963
2545
1964
2546
/* Cleans up the circular linked list of Mandos servers the client
1965
2547
has seen */
1966
2548
if(mc.current_server != NULL){
1972
2554
}
1973
2555
}
1974
2556
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");
2557
/* Re-raise privileges */
2558
{
2559
ret_errno = raise_privileges();
2560
if(ret_errno != 0){
2561
errno = ret_errno;
2562
perror_plus("Failed to raise privileges");
2563
} else {
2564
2565
/* Run network hooks */
2566
run_network_hooks("stop", interfaces_hooks != NULL ?
2567
interfaces_hooks : "", delay);
2568
2569
/* Take down the network interfaces which were brought up */
2570
{
2571
char *interface = NULL;
2572
while((interface=argz_next(interfaces_to_take_down,
2573
interfaces_to_take_down_size,
2574
interface))){
2575
ret_errno = take_down_interface(interface);
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to take down interface");
2579
}
2580
}
2581
if(debug and (interfaces_to_take_down == NULL)){
2582
fprintf_plus(stderr, "No interfaces needed to be taken"
2583
" down\n");
2584
}
2585
}
1982
2586
}
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
}
2587
2588
ret_errno = lower_privileges_permanently();
2589
if(ret_errno != 0){
2590
errno = ret_errno;
2591
perror_plus("Failed to lower privileges permanently");
2004
2592
}
2005
2593
}
2006
2594
2595
free(interfaces_to_take_down);
2596
free(interfaces_hooks);
2597
2007
2598
/* Removes the GPGME temp directory and all files inside */
2008
if(tempdir_created){
2599
if(tempdir != NULL){
2009
2600
struct dirent **direntries = NULL;
2010
struct dirent *direntry = NULL;
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2012
alphasort);
2013
if (numentries > 0){
2014
for(int i = 0; i < numentries; i++){
2015
direntry = direntries[i];
2016
char *fullname = NULL;
2017
ret = asprintf(&fullname, "%s/%s", tempdir,
2018
direntry->d_name);
2019
if(ret < 0){
2020
perror_plus("asprintf");
2021
continue;
2022
}
2023
ret = remove(fullname);
2024
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2027
}
2028
free(fullname);
2601
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2602
O_NOFOLLOW));
2603
if(tempdir_fd == -1){
2604
perror_plus("open");
2605
} else {
2606
#ifdef __GLIBC__
2607
#if __GLIBC_PREREQ(2, 15)
2608
int numentries = scandirat(tempdir_fd, ".", &direntries,
2609
notdotentries, alphasort);
2610
#else /* not __GLIBC_PREREQ(2, 15) */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC_PREREQ(2, 15) */
2614
#else /* not __GLIBC__ */
2615
int numentries = scandir(tempdir, &direntries, notdotentries,
2616
alphasort);
2617
#endif /* not __GLIBC__ */
2618
if(numentries >= 0){
2619
for(int i = 0; i < numentries; i++){
2620
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2621
if(ret == -1){
2622
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2623
" \"%s\", 0): %s\n", tempdir,
2624
direntries[i]->d_name, strerror(errno));
2625
}
2626
}
2627
2628
/* need to clean even if 0 because man page doesn't specify */
2629
free(direntries);
2630
if(numentries == -1){
2631
perror_plus("scandir");
2632
}
2633
ret = rmdir(tempdir);
2634
if(ret == -1 and errno != ENOENT){
2635
perror_plus("rmdir");
2636
}
2029
2637
}
2030
}
2031
2032
/* need to clean even if 0 because man page doesn't specify */
2033
free(direntries);
2034
if (numentries == -1){
2035
perror_plus("scandir");
2036
}
2037
ret = rmdir(tempdir);
2038
if(ret == -1 and errno != ENOENT){
2039
perror_plus("rmdir");
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
2040
2639
}
2041
2640
}
2042
2641
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0