To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 505.2.3
- compare with another revision
- download diff
- download tarball
- view history from revision 505.2.3
- Committer: Teddy Hogeborn
- Date: 2011-11-11 09:10:58 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111111091058-60y74fpjy2ce1c17
Intermediate commit - this does *not* work yet.
* plugins.d/mandos-client.c (HOOKDIR): New.
(up_interface): New.
(runnable_hook): New.
(main): Run network hooks with "start" argument.
* plugins.d/mandos-client.c (HOOKDIR): New.
(up_interface): New.
(runnable_hook): New.
(main): Run network hooks with "start" argument.
- files removed:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strcpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
86
85
raise() */
87
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
87
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() */
98
88
99
89
#ifdef __linux__
100
90
#include <sys/klog.h> /* klogctl() */
118
108
init_gnutls_session(),
119
109
GNUTLS_* */
120
110
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
123
113
124
114
/* GPGME */
125
115
#include <gpgme.h> /* All GPGME types, constants and
141
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
132
static const char sys_class_net[] = "/sys/class/net";
143
133
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
134
149
135
/* Doubly linked list that need to be circularly linked when used */
150
136
typedef struct server{
151
137
const char *ip;
152
in_port_t port;
138
uint16_t port;
153
139
AvahiIfIndex if_index;
154
140
int af;
155
141
struct timespec last_seen;
159
145
160
146
/* Used for passing in values through the Avahi callback functions */
161
147
typedef struct {
148
AvahiSimplePoll *simple_poll;
162
149
AvahiServer *server;
163
150
gnutls_certificate_credentials_t cred;
164
151
unsigned int dh_bits;
166
153
const char *priority;
167
154
gpgme_ctx_t ctx;
168
155
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
156
} mandos_context;
172
157
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
175
163
176
164
sig_atomic_t quit_now = 0;
177
165
int signal_received = 0;
178
166
179
167
/* Function to use when printing errors */
180
168
void perror_plus(const char *print_text){
181
int e = errno;
182
169
fprintf(stderr, "Mandos plugin %s: ",
183
170
program_invocation_short_name);
184
errno = e;
185
171
perror(print_text);
186
172
}
187
173
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
198
174
/*
199
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
176
* bytes. "buffer_capacity" is how much is currently allocated,
201
177
* "buffer_length" is how much is already used.
202
178
*/
203
__attribute__((nonnull, warn_unused_result))
204
179
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
180
size_t buffer_capacity){
206
181
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
if(buffer == NULL){
213
184
return 0;
214
185
}
215
*buffer = new_buf;
216
186
buffer_capacity += BUFFER_SIZE;
217
187
}
218
188
return buffer_capacity;
219
189
}
220
190
221
191
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
225
195
int ret;
226
196
server *new_server = malloc(sizeof(server));
227
197
if(new_server == NULL){
228
198
perror_plus("malloc");
229
return false;
199
return -1;
230
200
}
231
201
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
202
.port = port,
203
.if_index = if_index,
204
.af = af };
235
205
if(new_server->ip == NULL){
236
206
perror_plus("strdup");
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
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
207
return -1;
253
208
}
254
209
/* Special case of first server */
255
if(*current_server == NULL){
210
if (mc.current_server == NULL){
256
211
new_server->next = new_server;
257
212
new_server->prev = new_server;
258
*current_server = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
259
215
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
263
218
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
267
227
}
268
228
269
229
/*
270
230
* Initialize GPGME.
271
231
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
277
234
gpgme_error_t rc;
278
235
gpgme_engine_info_t engine_info;
279
236
237
280
238
/*
281
239
* Helper function to insert pub and seckey to the engine keyring.
282
240
*/
283
bool import_key(const char * const filename){
241
bool import_key(const char *filename){
284
242
int ret;
285
243
int fd;
286
244
gpgme_data_t pgp_data;
293
251
294
252
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
253
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
298
256
return false;
299
257
}
300
258
301
rc = gpgme_op_import(mc->ctx, pgp_data);
259
rc = gpgme_op_import(mc.ctx, pgp_data);
302
260
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
305
263
return false;
306
264
}
307
265
308
ret = close(fd);
266
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
267
if(ret == -1){
310
268
perror_plus("close");
311
269
}
314
272
}
315
273
316
274
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
275
fprintf(stderr, "Initializing GPGME\n");
318
276
}
319
277
320
278
/* Init GPGME */
321
279
gpgme_check_version(NULL);
322
280
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
281
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
326
284
return false;
327
285
}
328
286
329
287
/* Set GPGME home directory for the OpenPGP engine only */
330
288
rc = gpgme_get_engine_info(&engine_info);
331
289
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
334
292
return false;
335
293
}
336
294
while(engine_info != NULL){
342
300
engine_info = engine_info->next;
343
301
}
344
302
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
304
return false;
348
305
}
349
306
350
307
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
308
rc = gpgme_new(&(mc.ctx));
352
309
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
356
312
return false;
357
313
}
358
314
367
323
* Decrypt OpenPGP data.
368
324
* Returns -1 on error
369
325
*/
370
__attribute__((nonnull, warn_unused_result))
371
326
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
327
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
328
char **plaintext){
375
329
gpgme_data_t dh_crypto, dh_plain;
376
330
gpgme_error_t rc;
377
331
ssize_t ret;
379
333
ssize_t plaintext_length = 0;
380
334
381
335
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
337
}
384
338
385
339
/* Create new GPGME data buffer from memory cryptotext */
386
340
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
341
0);
388
342
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
391
345
return -1;
392
346
}
393
347
394
348
/* Create new empty GPGME data buffer for the plaintext */
395
349
rc = gpgme_data_new(&dh_plain);
396
350
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
400
353
gpgme_data_release(dh_crypto);
401
354
return -1;
402
355
}
403
356
404
357
/* Decrypt data from the cryptotext data buffer to the plaintext
405
358
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
360
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
410
363
plaintext_length = -1;
411
364
if(debug){
412
365
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
366
result = gpgme_op_decrypt_result(mc.ctx);
414
367
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
369
} else {
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
421
374
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
fprintf(stderr, "File name: %s\n", result->file_name);
423
376
}
424
377
gpgme_recipient_t recipient;
425
378
recipient = result->recipients;
426
379
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
434
386
recipient = recipient->next;
435
387
}
436
388
}
439
391
}
440
392
441
393
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
395
}
444
396
445
397
/* Seek back to the beginning of the GPGME plaintext data buffer */
452
404
*plaintext = NULL;
453
405
while(true){
454
406
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
407
(size_t)plaintext_length,
408
plaintext_capacity);
457
409
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
461
413
}
462
414
463
415
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
476
428
}
477
429
478
430
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
431
fprintf(stderr, "Decrypted password is: ");
480
432
for(ssize_t i = 0; i < plaintext_length; i++){
481
433
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
434
}
493
445
return plaintext_length;
494
446
}
495
447
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
451
if(ret == NULL)
452
ret = "(unknown)";
453
return ret;
507
454
}
508
455
509
456
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
457
static void debuggnutls(__attribute__((unused)) int level,
512
458
const char* string){
513
fprintf_plus(stderr, "GnuTLS: %s", string);
459
fprintf(stderr, "GnuTLS: %s", string);
514
460
}
515
461
516
__attribute__((nonnull, warn_unused_result))
517
462
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
463
const char *seckeyfilename){
521
464
int ret;
522
unsigned int uret;
523
465
524
466
if(debug){
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
fprintf(stderr, "Initializing GnuTLS\n");
526
468
}
527
469
528
470
ret = gnutls_global_init();
529
471
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
532
474
return -1;
533
475
}
534
476
541
483
}
542
484
543
485
/* OpenPGP credentials */
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
545
487
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
548
490
gnutls_global_deinit();
549
491
return -1;
550
492
}
551
493
552
494
if(debug){
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
557
498
}
558
499
559
500
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
501
(mc.cred, pubkeyfilename, seckeyfilename,
561
502
GNUTLS_OPENPGP_FMT_BASE64);
562
503
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr,
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
504
fprintf(stderr,
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
568
509
goto globalfail;
569
510
}
570
511
571
512
/* GnuTLS server initialization */
572
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
577
goto globalfail;
578
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
513
ret = gnutls_dh_params_init(&mc.dh_params);
514
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
517
goto globalfail;
518
}
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
520
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
523
goto globalfail;
524
}
525
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
752
527
753
528
return 0;
754
529
755
530
globalfail:
756
531
757
gnutls_certificate_free_credentials(mc->cred);
532
gnutls_certificate_free_credentials(mc.cred);
758
533
gnutls_global_deinit();
759
gnutls_dh_params_deinit(mc->dh_params);
534
gnutls_dh_params_deinit(mc.dh_params);
760
535
return -1;
761
536
}
762
537
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
538
static int init_gnutls_session(gnutls_session_t *session){
766
539
int ret;
767
540
/* GnuTLS session creation */
768
541
do {
772
545
}
773
546
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
774
547
if(ret != GNUTLS_E_SUCCESS){
775
fprintf_plus(stderr,
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
778
550
}
779
551
780
552
{
781
553
const char *err;
782
554
do {
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
784
556
if(quit_now){
785
557
gnutls_deinit(*session);
786
558
return -1;
787
559
}
788
560
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
789
561
if(ret != GNUTLS_E_SUCCESS){
790
fprintf_plus(stderr, "Syntax error at: %s\n", err);
791
fprintf_plus(stderr, "GnuTLS error: %s\n",
792
safer_gnutls_strerror(ret));
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
793
565
gnutls_deinit(*session);
794
566
return -1;
795
567
}
797
569
798
570
do {
799
571
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
800
mc->cred);
572
mc.cred);
801
573
if(quit_now){
802
574
gnutls_deinit(*session);
803
575
return -1;
804
576
}
805
577
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
806
578
if(ret != GNUTLS_E_SUCCESS){
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
809
581
gnutls_deinit(*session);
810
582
return -1;
811
583
}
813
585
/* ignore client certificate if any. */
814
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
815
587
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
589
816
590
return 0;
817
591
}
818
592
820
594
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
595
__attribute__((unused)) const char *txt){}
822
596
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = close(devnull);
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
close(helperdir_fd);
958
_exit(EX_UNAVAILABLE);
959
}
960
close(helperdir_fd);
961
#ifdef __GNUC__
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
964
#endif
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
968
environ) == -1){
969
#ifdef __GNUC__
970
#pragma GCC diagnostic pop
971
#endif
972
perror_plus("fexecve");
973
_exit(EXIT_FAILURE);
974
}
975
}
976
if(pid == -1){
977
perror_plus("fork");
978
return false;
979
}
980
int status;
981
pid_t pret = -1;
982
errno = 0;
983
do {
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
991
}
992
if(kill(pid, SIGTERM) == -1){
993
perror_plus("kill");
994
}
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
997
" helper program");
998
}
999
return false;
1000
}
1001
} while(pret == -1 and errno == EINTR);
1002
if(pret == -1){
1003
perror_plus("waitpid");
1004
return false;
1005
}
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1010
return false;
1011
}
1012
return true;
1013
}
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1017
return false;
1018
}
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1020
return false;
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
}
1029
return add_delete_local_route(true, address, if_index);
1030
}
1031
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1035
if(debug){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
}
1038
return add_delete_local_route(false, address, if_index);
1039
}
1040
1041
597
/* Called when a Mandos server is found */
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
598
static int start_mandos_communication(const char *ip, uint16_t port,
1044
599
AvahiIfIndex if_index,
1045
int af, mandos_context *mc){
600
int af){
1046
601
int ret, tcp_sd = -1;
1047
602
ssize_t sret;
1048
struct sockaddr_storage to;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
1049
607
char *buffer = NULL;
1050
608
char *decrypted_buffer = NULL;
1051
609
size_t buffer_length = 0;
1054
612
int retval = -1;
1055
613
gnutls_session_t session;
1056
614
int pf; /* Protocol family */
1057
bool route_added = false;
1058
615
1059
616
errno = 0;
1060
617
1071
628
pf = PF_INET;
1072
629
break;
1073
630
default:
1074
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
fprintf(stderr, "Bad address family: %d\n", af);
1075
632
errno = EINVAL;
1076
633
return -1;
1077
634
}
1078
635
1079
/* If the interface is specified and we have a list of interfaces */
1080
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1081
/* Check if the interface is one of the interfaces we are using */
1082
bool match = false;
1083
{
1084
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
1107
return -1;
1108
}
1109
}
1110
1111
ret = init_gnutls_session(&session, mc);
636
ret = init_gnutls_session(&session);
1112
637
if(ret != 0){
1113
638
return -1;
1114
639
}
1115
640
1116
641
if(debug){
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
1119
644
}
1120
645
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
1122
647
if(tcp_sd < 0){
1123
648
int e = errno;
1124
649
perror_plus("socket");
1131
656
goto mandos_end;
1132
657
}
1133
658
659
memset(&to, 0, sizeof(to));
1134
660
if(af == AF_INET6){
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
663
} else { /* IPv4 */
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
1142
666
}
1143
667
if(ret < 0 ){
1144
668
int e = errno;
1148
672
}
1149
673
if(ret == 0){
1150
674
int e = errno;
1151
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
fprintf(stderr, "Bad address: %s\n", ip);
1152
676
errno = e;
1153
677
goto mandos_end;
1154
678
}
1155
679
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
1159
687
if(if_index == AVAHI_IF_UNSPEC){
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
" incomplete without a network interface\n");
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
1162
690
errno = EINVAL;
1163
691
goto mandos_end;
1164
692
}
1165
693
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
694
to.in6.sin6_scope_id = (uint32_t)if_index;
1167
695
}
1168
696
} else {
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
1170
700
}
1171
701
1172
702
if(quit_now){
1180
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1181
711
perror_plus("if_indextoname");
1182
712
} else {
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
1185
715
}
1186
716
} else {
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
1189
719
}
1190
720
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
721
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
722
const char *pcret;
723
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
726
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
729
}
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
732
} else {
733
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
}
736
}
737
}
738
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
}
749
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
1272
761
}
1273
762
1274
763
const char *out = mandos_protocol_version;
1276
765
while(true){
1277
766
size_t out_size = strlen(out);
1278
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1279
out_size - written));
768
out_size - written));
1280
769
if(ret == -1){
1281
770
int e = errno;
1282
771
perror_plus("write");
1302
791
}
1303
792
1304
793
if(debug){
1305
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1306
795
}
1307
796
1308
797
if(quit_now){
1310
799
goto mandos_end;
1311
800
}
1312
801
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1318
804
1319
805
if(quit_now){
1320
806
errno = EINTR;
1331
817
1332
818
if(ret != GNUTLS_E_SUCCESS){
1333
819
if(debug){
1334
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1335
821
gnutls_perror(ret);
1336
822
}
1337
823
errno = EPROTO;
1341
827
/* Read OpenPGP packet that contains the wanted password */
1342
828
1343
829
if(debug){
1344
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1345
" %s\n", ip);
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
1346
832
}
1347
833
1348
834
while(true){
1353
839
}
1354
840
1355
841
buffer_capacity = incbuffer(&buffer, buffer_length,
1356
buffer_capacity);
842
buffer_capacity);
1357
843
if(buffer_capacity == 0){
1358
844
int e = errno;
1359
845
perror_plus("incbuffer");
1386
872
}
1387
873
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1388
874
if(ret < 0){
1389
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1390
"***\n");
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1391
876
gnutls_perror(ret);
1392
877
errno = EPROTO;
1393
878
goto mandos_end;
1394
879
}
1395
880
break;
1396
881
default:
1397
fprintf_plus(stderr, "Unknown error while reading data from"
1398
" encrypted session with Mandos server\n");
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
1399
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1400
885
errno = EIO;
1401
886
goto mandos_end;
1406
891
}
1407
892
1408
893
if(debug){
1409
fprintf_plus(stderr, "Closing TLS session\n");
894
fprintf(stderr, "Closing TLS session\n");
1410
895
}
1411
896
1412
897
if(quit_now){
1424
909
1425
910
if(buffer_length > 0){
1426
911
ssize_t decrypted_buffer_size;
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
1429
915
if(decrypted_buffer_size >= 0){
1430
916
1431
917
written = 0;
1441
927
if(ret == 0 and ferror(stdout)){
1442
928
int e = errno;
1443
929
if(debug){
1444
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1445
strerror(errno));
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
1446
932
}
1447
933
errno = e;
1448
934
goto mandos_end;
1457
943
1458
944
mandos_end:
1459
945
{
1460
if(route_added){
1461
if(not delete_local_route(ip, if_index)){
1462
fprintf_plus(stderr, "Failed to delete local route to %s on"
1463
" interface %d", ip, if_index);
1464
}
1465
}
1466
946
int e = errno;
1467
947
free(decrypted_buffer);
1468
948
free(buffer);
1469
949
if(tcp_sd >= 0){
1470
ret = close(tcp_sd);
950
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1471
951
}
1472
952
if(ret == -1){
1473
953
if(e == 0){
1485
965
return retval;
1486
966
}
1487
967
1488
__attribute__((nonnull))
1489
968
static void resolve_callback(AvahiSServiceResolver *r,
1490
969
AvahiIfIndex interface,
1491
970
AvahiProtocol proto,
1499
978
AVAHI_GCC_UNUSED AvahiStringList *txt,
1500
979
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1501
980
flags,
1502
void *mc){
1503
if(r == NULL){
1504
return;
1505
}
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1506
983
1507
984
/* Called whenever a service has been resolved successfully or
1508
985
timed out */
1509
986
1510
987
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1512
988
return;
1513
989
}
1514
990
1515
991
switch(event){
1516
992
default:
1517
993
case AVAHI_RESOLVER_FAILURE:
1518
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1519
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1520
domain,
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
1523
997
break;
1524
998
1525
999
case AVAHI_RESOLVER_FOUND:
1527
1001
char ip[AVAHI_ADDRESS_STR_MAX];
1528
1002
avahi_address_snprint(ip, sizeof(ip), address);
1529
1003
if(debug){
1530
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1531
PRIdMAX ") on port %" PRIu16 "\n", name,
1532
host_name, ip, (intmax_t)interface, port);
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1533
1007
}
1534
int ret = start_mandos_communication(ip, (in_port_t)port,
1535
interface,
1536
avahi_proto_to_af(proto),
1537
mc);
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1538
1010
if(ret == 0){
1539
avahi_simple_poll_quit(simple_poll);
1011
avahi_simple_poll_quit(mc.simple_poll);
1540
1012
} else {
1541
if(not add_server(ip, (in_port_t)port, interface,
1542
avahi_proto_to_af(proto),
1543
&((mandos_context*)mc)->current_server)){
1544
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1545
" list\n", name);
1546
}
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1547
1015
}
1548
1016
}
1549
1017
}
1559
1027
const char *domain,
1560
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1561
1029
flags,
1562
void *mc){
1563
if(b == NULL){
1564
return;
1565
}
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1566
1032
1567
1033
/* Called whenever a new services becomes available on the LAN or
1568
1034
is removed from the LAN */
1575
1041
default:
1576
1042
case AVAHI_BROWSER_FAILURE:
1577
1043
1578
fprintf_plus(stderr, "(Avahi browser) %s\n",
1579
avahi_strerror(avahi_server_errno
1580
(((mandos_context*)mc)->server)));
1581
avahi_simple_poll_quit(simple_poll);
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1582
1047
return;
1583
1048
1584
1049
case AVAHI_BROWSER_NEW:
1587
1052
the callback function is called the Avahi server will free the
1588
1053
resolver for us. */
1589
1054
1590
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1591
interface, protocol, name, type,
1592
domain, protocol, 0,
1593
resolve_callback, mc) == NULL)
1594
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1595
" %s\n", name,
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
1598
1060
break;
1599
1061
1600
1062
case AVAHI_BROWSER_REMOVE:
1603
1065
case AVAHI_BROWSER_ALL_FOR_NOW:
1604
1066
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1605
1067
if(debug){
1606
fprintf_plus(stderr, "No Mandos server found, still"
1607
" searching...\n");
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1608
1069
}
1609
1070
break;
1610
1071
}
1619
1080
signal_received = sig;
1620
1081
int old_errno = errno;
1621
1082
/* set main loop to exit */
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1624
1085
}
1625
1086
errno = old_errno;
1626
1087
}
1627
1088
1628
__attribute__((nonnull, warn_unused_result))
1629
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
1090
int ret;
1631
error_t ret_errno;
1632
1091
1633
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1634
1093
if(s < 0){
1635
ret_errno = errno;
1636
1094
perror_plus("socket");
1637
errno = ret_errno;
1638
1095
return false;
1639
1096
}
1640
1097
strcpy(ifr->ifr_name, ifname);
1641
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1642
1099
if(ret == -1){
1643
1100
if(debug){
1644
ret_errno = errno;
1645
1101
perror_plus("ioctl SIOCGIFFLAGS");
1646
errno = ret_errno;
1647
1102
}
1648
1103
return false;
1649
1104
}
1650
1105
return true;
1651
1106
}
1652
1107
1653
__attribute__((nonnull, warn_unused_result))
1654
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1655
1109
1656
1110
/* Reject the loopback device */
1657
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1658
1112
if(debug){
1659
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1660
ifname);
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1661
1115
}
1662
1116
return false;
1663
1117
}
1664
1118
/* Accept point-to-point devices only if connect_to is specified */
1665
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1666
1120
if(debug){
1667
fprintf_plus(stderr, "Accepting point-to-point interface"
1668
" \"%s\"\n", ifname);
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1669
1123
}
1670
1124
return true;
1671
1125
}
1672
1126
/* Otherwise, reject non-broadcast-capable devices */
1673
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1674
1128
if(debug){
1675
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1676
" \"%s\"\n", ifname);
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1677
1131
}
1678
1132
return false;
1679
1133
}
1680
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1681
1135
if(ifr->ifr_flags & IFF_NOARP){
1682
1136
if(debug){
1683
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1684
ifname);
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1685
1138
}
1686
1139
return false;
1687
1140
}
1688
1141
1689
1142
/* Accept this device */
1690
1143
if(debug){
1691
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1692
1145
}
1693
1146
return true;
1694
1147
}
1698
1151
* corresponds to an acceptable network device.
1699
1152
* (This function is passed to scandir(3) as a filter function.)
1700
1153
*/
1701
__attribute__((nonnull, warn_unused_result))
1702
1154
int good_interface(const struct dirent *if_entry){
1155
int ret;
1703
1156
if(if_entry->d_name[0] == '.'){
1704
1157
return 0;
1705
1158
}
1706
1707
1159
struct ifreq ifr;
1160
1708
1161
if(not get_flags(if_entry->d_name, &ifr)){
1709
if(debug){
1710
fprintf_plus(stderr, "Failed to get flags for interface "
1711
"\"%s\"\n", if_entry->d_name);
1712
}
1713
1162
return 0;
1714
1163
}
1715
1164
1720
1169
}
1721
1170
1722
1171
/*
1723
* This function determines if a network interface is up.
1724
*/
1725
__attribute__((nonnull, warn_unused_result))
1726
bool interface_is_up(const char *interface){
1727
struct ifreq ifr;
1728
if(not get_flags(interface, &ifr)){
1729
if(debug){
1730
fprintf_plus(stderr, "Failed to get flags for interface "
1731
"\"%s\"\n", interface);
1732
}
1733
return false;
1734
}
1735
1736
return (bool)(ifr.ifr_flags & IFF_UP);
1737
}
1738
1739
/*
1740
* This function determines if a network interface is running
1741
*/
1742
__attribute__((nonnull, warn_unused_result))
1743
bool interface_is_running(const char *interface){
1744
struct ifreq ifr;
1745
if(not get_flags(interface, &ifr)){
1746
if(debug){
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
}
1750
return false;
1751
}
1752
1753
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1754
}
1755
1756
__attribute__((nonnull, pure, warn_unused_result))
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device which is up.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int up_interface(const struct dirent *if_entry){
1177
ssize_t ssret;
1178
char *flagname = NULL;
1179
if(if_entry->d_name[0] == '.'){
1180
return 0;
1181
}
1182
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1183
if_entry->d_name);
1184
if(ret < 0){
1185
perror_plus("asprintf");
1186
return 0;
1187
}
1188
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1189
if(flags_fd == -1){
1190
perror_plus("open");
1191
free(flagname);
1192
return 0;
1193
}
1194
free(flagname);
1195
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1196
/* read line from flags_fd */
1197
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1198
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1199
flagstring[(size_t)to_read] = '\0';
1200
if(flagstring == NULL){
1201
perror_plus("malloc");
1202
close(flags_fd);
1203
return 0;
1204
}
1205
while(to_read > 0){
1206
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1207
(size_t)to_read));
1208
if(ssret == -1){
1209
perror_plus("read");
1210
free(flagstring);
1211
close(flags_fd);
1212
return 0;
1213
}
1214
to_read -= ssret;
1215
if(ssret == 0){
1216
break;
1217
}
1218
}
1219
close(flags_fd);
1220
intmax_t tmpmax;
1221
char *tmp;
1222
errno = 0;
1223
tmpmax = strtoimax(flagstring, &tmp, 0);
1224
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1225
and not (isspace(*tmp)))
1226
or tmpmax != (ifreq_flags)tmpmax){
1227
if(debug){
1228
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1229
flagstring, if_entry->d_name);
1230
}
1231
free(flagstring);
1232
return 0;
1233
}
1234
free(flagstring);
1235
ifreq_flags flags = (ifreq_flags)tmpmax;
1236
/* Reject the loopback device */
1237
if(flags & IFF_LOOPBACK){
1238
if(debug){
1239
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (flags & IFF_UP)){
1247
return 0;
1248
}
1249
1250
/* Accept point-to-point devices only if connect_to is specified */
1251
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1252
if(debug){
1253
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1254
if_entry->d_name);
1255
}
1256
return 1;
1257
}
1258
/* Otherwise, reject non-broadcast-capable devices */
1259
if(not (flags & IFF_BROADCAST)){
1260
if(debug){
1261
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 0;
1265
}
1266
/* Reject non-ARP interfaces (including dummy interfaces) */
1267
if(flags & IFF_NOARP){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Accept this device */
1275
if(debug){
1276
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1277
if_entry->d_name);
1278
}
1279
return 1;
1280
}
1281
1757
1282
int notdotentries(const struct dirent *direntry){
1758
1283
/* Skip "." and ".." */
1759
1284
if(direntry->d_name[0] == '.'
1766
1291
}
1767
1292
1768
1293
/* Is this directory entry a runnable program? */
1769
__attribute__((nonnull, warn_unused_result))
1770
1294
int runnable_hook(const struct dirent *direntry){
1771
1295
int ret;
1772
size_t sret;
1773
1296
struct stat st;
1774
1297
1775
1298
if((direntry->d_name)[0] == '\0'){
1777
1300
return 0;
1778
1301
}
1779
1302
1780
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1781
"abcdefghijklmnopqrstuvwxyz"
1782
"0123456789"
1783
"_.-");
1784
if((direntry->d_name)[sret] != '\0'){
1785
/* Contains non-allowed characters */
1786
if(debug){
1787
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1788
direntry->d_name);
1789
}
1790
return 0;
1791
}
1792
1793
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1303
/* Save pointer to last character */
1304
char *end = strchr(direntry->d_name, '\0')-1;
1305
1306
if(*end == '~'){
1307
/* Backup name~ */
1308
return 0;
1309
}
1310
1311
if(((direntry->d_name)[0] == '#')
1312
and (*end == '#')){
1313
/* Temporary #name# */
1314
return 0;
1315
}
1316
1317
/* XXX more rules here */
1318
1319
ret = stat(direntry->d_name, &st);
1794
1320
if(ret == -1){
1795
1321
if(debug){
1796
perror_plus("Could not stat hook");
1322
perror_plus("Could not stat plugin");
1797
1323
}
1798
1324
return 0;
1799
1325
}
1800
if(not (S_ISREG(st.st_mode))){
1326
if(not (st.st_mode & S_ISREG)){
1801
1327
/* Not a regular file */
1802
if(debug){
1803
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1804
direntry->d_name);
1805
}
1806
1328
return 0;
1807
1329
}
1808
1330
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1809
1331
/* Not executable */
1810
if(debug){
1811
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1812
direntry->d_name);
1813
}
1814
1332
return 0;
1815
1333
}
1816
if(debug){
1817
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1818
direntry->d_name);
1819
}
1820
1334
return 1;
1821
1335
}
1822
1336
1823
__attribute__((nonnull, warn_unused_result))
1824
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1825
mandos_context *mc){
1337
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1826
1338
int ret;
1827
1339
struct timespec now;
1828
1340
struct timespec waited_time;
1829
1341
intmax_t block_time;
1830
1342
1831
1343
while(true){
1832
if(mc->current_server == NULL){
1833
if(debug){
1834
fprintf_plus(stderr, "Wait until first server is found."
1835
" No timeout!\n");
1344
if(mc.current_server == NULL){
1345
if (debug){
1346
fprintf(stderr,
1347
"Wait until first server is found. No timeout!\n");
1836
1348
}
1837
1349
ret = avahi_simple_poll_iterate(s, -1);
1838
1350
} else {
1839
if(debug){
1840
fprintf_plus(stderr, "Check current_server if we should run"
1841
" it, or wait\n");
1351
if (debug){
1352
fprintf(stderr, "Check current_server if we should run it,"
1353
" or wait\n");
1842
1354
}
1843
1355
/* the current time */
1844
1356
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1849
1361
/* Calculating in ms how long time between now and server
1850
1362
who we visted longest time ago. Now - last seen. */
1851
1363
waited_time.tv_sec = (now.tv_sec
1852
- mc->current_server->last_seen.tv_sec);
1364
- mc.current_server->last_seen.tv_sec);
1853
1365
waited_time.tv_nsec = (now.tv_nsec
1854
- mc->current_server->last_seen.tv_nsec);
1366
- mc.current_server->last_seen.tv_nsec);
1855
1367
/* total time is 10s/10,000ms.
1856
1368
Converting to s from ms by dividing by 1,000,
1857
1369
and ns to ms by dividing by 1,000,000. */
1859
1371
- ((intmax_t)waited_time.tv_sec * 1000))
1860
1372
- ((intmax_t)waited_time.tv_nsec / 1000000));
1861
1373
1862
if(debug){
1863
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1864
block_time);
1374
if (debug){
1375
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1865
1376
}
1866
1377
1867
1378
if(block_time <= 0){
1868
ret = start_mandos_communication(mc->current_server->ip,
1869
mc->current_server->port,
1870
mc->current_server->if_index,
1871
mc->current_server->af, mc);
1379
ret = start_mandos_communication(mc.current_server->ip,
1380
mc.current_server->port,
1381
mc.current_server->if_index,
1382
mc.current_server->af);
1872
1383
if(ret == 0){
1873
avahi_simple_poll_quit(s);
1384
avahi_simple_poll_quit(mc.simple_poll);
1874
1385
return 0;
1875
1386
}
1876
1387
ret = clock_gettime(CLOCK_MONOTONIC,
1877
&mc->current_server->last_seen);
1388
&mc.current_server->last_seen);
1878
1389
if(ret == -1){
1879
1390
perror_plus("clock_gettime");
1880
1391
return -1;
1881
1392
}
1882
mc->current_server = mc->current_server->next;
1393
mc.current_server = mc.current_server->next;
1883
1394
block_time = 0; /* Call avahi to find new Mandos
1884
1395
servers, but don't block */
1885
1396
}
1887
1398
ret = avahi_simple_poll_iterate(s, (int)block_time);
1888
1399
}
1889
1400
if(ret != 0){
1890
if(ret > 0 or errno != EINTR){
1401
if (ret > 0 or errno != EINTR) {
1891
1402
return (ret != 1) ? ret : 0;
1892
1403
}
1893
1404
}
1894
1405
}
1895
1406
}
1896
1407
1897
__attribute__((nonnull))
1898
void run_network_hooks(const char *mode, const char *interface,
1899
const float delay){
1900
struct dirent **direntries = NULL;
1901
if(hookdir_fd == -1){
1902
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1903
| O_CLOEXEC);
1904
if(hookdir_fd == -1){
1905
if(errno == ENOENT){
1906
if(debug){
1907
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1908
" found\n", hookdir);
1909
}
1910
} else {
1911
perror_plus("open");
1912
}
1913
return;
1914
}
1915
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1919
runnable_hook, alphasort);
1920
#else /* not __GLIBC_PREREQ(2, 15) */
1921
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1922
alphasort);
1923
#endif /* not __GLIBC_PREREQ(2, 15) */
1924
#else /* not __GLIBC__ */
1925
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1926
alphasort);
1927
#endif /* not __GLIBC__ */
1928
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1944
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1991
perror_plus("asprintf");
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1996
free(delaystring);
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
2065
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
2085
}
2086
2087
__attribute__((nonnull, warn_unused_result))
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t old_errno = errno;
2091
int ret;
2092
struct ifreq network;
2093
unsigned int if_index = if_nametoindex(interface);
2094
if(if_index == 0){
2095
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2096
errno = old_errno;
2097
return ENXIO;
2098
}
2099
2100
if(quit_now){
2101
errno = old_errno;
2102
return EINTR;
2103
}
2104
2105
if(not interface_is_up(interface)){
2106
error_t ret_errno = 0, ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
2108
ret_errno = errno;
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2110
"\"%s\"\n", interface);
2111
errno = old_errno;
2112
return ret_errno;
2113
}
2114
network.ifr_flags |= IFF_UP; /* set flag */
2115
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
2118
ret_errno = errno;
2119
perror_plus("socket");
2120
errno = old_errno;
2121
return ret_errno;
2122
}
2123
2124
if(quit_now){
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
2129
errno = old_errno;
2130
return EINTR;
2131
}
2132
2133
if(debug){
2134
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2135
interface);
2136
}
2137
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2140
if(ret_errno != 0){
2141
errno = ret_errno;
2142
perror_plus("Failed to raise privileges");
2143
}
2144
2145
#ifdef __linux__
2146
int ret_linux;
2147
bool restore_loglevel = false;
2148
if(ret_errno == 0){
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2154
} else {
2155
restore_loglevel = true;
2156
}
2157
}
2158
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
2161
#ifdef __linux__
2162
if(restore_loglevel){
2163
ret_linux = klogctl(7, NULL, 0);
2164
if(ret_linux == -1){
2165
perror_plus("klogctl");
2166
}
2167
}
2168
#endif /* __linux__ */
2169
2170
/* If raise_privileges() succeeded above */
2171
if(ret_errno == 0){
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2174
if(ret_errno != 0){
2175
errno = ret_errno;
2176
perror_plus("Failed to lower privileges");
2177
}
2178
}
2179
2180
/* Close the socket */
2181
ret = close(sd);
2182
if(ret == -1){
2183
perror_plus("close");
2184
}
2185
2186
if(ret_setflags == -1){
2187
errno = ioctl_errno;
2188
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2189
errno = old_errno;
2190
return ioctl_errno;
2191
}
2192
} else if(debug){
2193
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2194
interface);
2195
}
2196
2197
/* Sleep checking until interface is running.
2198
Check every 0.25s, up to total time of delay */
2199
for(int i=0; i < delay * 4; i++){
2200
if(interface_is_running(interface)){
2201
break;
2202
}
2203
struct timespec sleeptime = { .tv_nsec = 250000000 };
2204
ret = nanosleep(&sleeptime, NULL);
2205
if(ret == -1 and errno != EINTR){
2206
perror_plus("nanosleep");
2207
}
2208
}
2209
2210
errno = old_errno;
2211
return 0;
2212
}
2213
2214
__attribute__((nonnull, warn_unused_result))
2215
error_t take_down_interface(const char *const interface){
2216
error_t old_errno = errno;
2217
struct ifreq network;
2218
unsigned int if_index = if_nametoindex(interface);
2219
if(if_index == 0){
2220
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2221
errno = old_errno;
2222
return ENXIO;
2223
}
2224
if(interface_is_up(interface)){
2225
error_t ret_errno = 0, ioctl_errno = 0;
2226
if(not get_flags(interface, &network) and debug){
2227
ret_errno = errno;
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2229
"\"%s\"\n", interface);
2230
errno = old_errno;
2231
return ret_errno;
2232
}
2233
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
if(sd == -1){
2237
ret_errno = errno;
2238
perror_plus("socket");
2239
errno = old_errno;
2240
return ret_errno;
2241
}
2242
2243
if(debug){
2244
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2245
interface);
2246
}
2247
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to raise privileges");
2253
}
2254
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
2267
2268
/* Close the socket */
2269
int ret = close(sd);
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
errno = old_errno;
2278
return ioctl_errno;
2279
}
2280
} else if(debug){
2281
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2282
interface);
2283
}
2284
2285
errno = old_errno;
2286
return 0;
2287
}
2288
2289
1408
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
2295
1409
AvahiSServiceBrowser *sb = NULL;
2296
error_t ret_errno;
1410
int error;
2297
1411
int ret;
2298
1412
intmax_t tmpmax;
2299
1413
char *tmp;
2300
1414
int exitcode = EXIT_SUCCESS;
2301
char *interfaces_to_take_down = NULL;
2302
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
1415
const char *interface = "";
1416
struct ifreq network;
1417
int sd = -1;
1418
bool take_down_interface = false;
1419
uid_t uid;
1420
gid_t gid;
1421
char tempdir[] = "/tmp/mandosXXXXXX";
1422
bool tempdir_created = false;
2306
1423
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2307
1424
const char *seckey = PATHDIR "/" SECKEY;
2308
1425
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
char *interfaces_hooks = NULL;
2311
1426
2312
1427
bool gnutls_initialized = false;
2313
1428
bool gpgme_initialized = false;
2365
1480
.doc = "Bit length of the prime number used in the"
2366
1481
" Diffie-Hellman key exchange",
2367
1482
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
2373
1483
{ .name = "priority", .key = 130,
2374
1484
.arg = "STRING",
2375
1485
.doc = "GnuTLS priority string for the TLS handshake",
2380
1490
.group = 2 },
2381
1491
{ .name = "retry", .key = 132,
2382
1492
.arg = "SECONDS",
2383
.doc = "Retry interval used when denied by the Mandos server",
2384
.group = 2 },
2385
{ .name = "network-hook-dir", .key = 133,
2386
.arg = "DIR",
2387
.doc = "Directory where network hooks are located",
1493
.doc = "Retry interval used when denied by the mandos server",
2388
1494
.group = 2 },
2389
1495
/*
2390
1496
* These reproduce what we would get without ARGP_NO_HELP
2409
1515
connect_to = arg;
2410
1516
break;
2411
1517
case 'i': /* --interface */
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
arg, (int)',');
2414
if(ret_errno != 0){
2415
argp_error(state, "%s", strerror(ret_errno));
2416
}
1518
interface = arg;
2417
1519
break;
2418
1520
case 's': /* --seckey */
2419
1521
seckey = arg;
2430
1532
}
2431
1533
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2432
1534
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
2436
1535
case 130: /* --priority */
2437
1536
mc.priority = arg;
2438
1537
break;
2451
1550
argp_error(state, "Bad retry interval");
2452
1551
}
2453
1552
break;
2454
case 133: /* --network-hook-dir */
2455
hookdir = arg;
2456
break;
2457
1553
/*
2458
1554
* These reproduce what we would get without ARGP_NO_HELP
2459
1555
*/
2465
1561
argp_state_help(state, state->out_stream,
2466
1562
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2467
1563
case 'V': /* --version */
2468
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1564
fprintf(state->out_stream, "%s\n", argp_program_version);
2469
1565
exit(argp_err_exit_status);
2470
1566
break;
2471
1567
default:
2494
1590
goto end;
2495
1591
}
2496
1592
}
2497
1593
2498
1594
{
2499
1595
/* Work around Debian bug #633582:
2500
1596
<http://bugs.debian.org/633582> */
2501
2502
/* Re-raise privileges */
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2506
perror_plus("Failed to raise privileges");
2507
} else {
2508
struct stat st;
2509
2510
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2511
int seckey_fd = open(seckey, O_RDONLY);
2512
if(seckey_fd == -1){
2513
perror_plus("open");
2514
} else {
2515
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2516
if(ret == -1){
2517
perror_plus("fstat");
2518
} else {
2519
if(S_ISREG(st.st_mode)
2520
and st.st_uid == 0 and st.st_gid == 0){
2521
ret = fchown(seckey_fd, uid, gid);
2522
if(ret == -1){
2523
perror_plus("fchown");
2524
}
2525
}
2526
}
2527
close(seckey_fd);
2528
}
2529
}
2530
2531
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
int pubkey_fd = open(pubkey, O_RDONLY);
2533
if(pubkey_fd == -1){
2534
perror_plus("open");
2535
} else {
2536
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2537
if(ret == -1){
2538
perror_plus("fstat");
2539
} else {
2540
if(S_ISREG(st.st_mode)
2541
and st.st_uid == 0 and st.st_gid == 0){
2542
ret = fchown(pubkey_fd, uid, gid);
2543
if(ret == -1){
2544
perror_plus("fchown");
2545
}
2546
}
2547
}
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
2574
/* Lower privileges */
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to lower privileges");
2579
}
2580
}
2581
}
2582
2583
/* Remove invalid interface names (except "none") */
2584
{
2585
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2587
interface))){
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2591
fprintf_plus(stderr, "Not using nonexisting interface"
2592
" \"%s\"\n", interface);
2593
}
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2595
interface = NULL;
2596
}
2597
}
2598
}
2599
2600
/* Run network hooks */
2601
{
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2604
if(interfaces_hooks == NULL){
2605
perror_plus("malloc");
1597
struct stat st;
1598
1599
/* Re-raise priviliges */
1600
errno = 0;
1601
ret = seteuid(0);
1602
if(ret == -1){
1603
perror_plus("seteuid");
1604
}
1605
1606
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1607
int seckey_fd = open(seckey, O_RDONLY);
1608
if(seckey_fd == -1){
1609
perror_plus("open");
1610
} else {
1611
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1612
if(ret == -1){
1613
perror_plus("fstat");
1614
} else {
1615
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1616
ret = fchown(seckey_fd, uid, gid);
1617
if(ret == -1){
1618
perror_plus("fchown");
1619
}
1620
}
1621
}
1622
TEMP_FAILURE_RETRY(close(seckey_fd));
1623
}
1624
}
1625
1626
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1627
int pubkey_fd = open(pubkey, O_RDONLY);
1628
if(pubkey_fd == -1){
1629
perror_plus("open");
1630
} else {
1631
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1632
if(ret == -1){
1633
perror_plus("fstat");
1634
} else {
1635
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1636
ret = fchown(pubkey_fd, uid, gid);
1637
if(ret == -1){
1638
perror_plus("fchown");
1639
}
1640
}
1641
}
1642
TEMP_FAILURE_RETRY(close(pubkey_fd));
1643
}
1644
}
1645
1646
/* Lower privileges */
1647
errno = 0;
1648
ret = seteuid(uid);
1649
if(ret == -1){
1650
perror_plus("seteuid");
1651
}
1652
}
1653
1654
/* Find network hooks and run them */
1655
{
1656
struct dirent **direntries;
1657
struct dirent *direntry;
1658
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1659
alphasort);
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[0];
1663
char *fullname = NULL;
1664
ret = asprintf(&fullname, "%s/%s", tempdir,
1665
direntry->d_name);
1666
if(ret < 0){
1667
perror_plus("asprintf");
1668
continue;
1669
}
1670
pid_t hook_pid = fork();
1671
if(hook_pid == 0){
1672
/* Child */
1673
dup2(devnull, STDIN_FILENO);
1674
close(devnull);
1675
dup2(STDERR_FILENO, STDOUT_FILENO);
1676
setenv("DEVICE", interface, 1);
1677
setenv("VERBOSE", debug ? "1" : "0", 1);
1678
setenv("MODE", "start", 1);
1679
/* setenv( XXX more here */
1680
ret = execl(fullname, direntry->d_name, "start");
1681
perror_plus("execl");
1682
}
1683
free(fullname);
1684
if(quit_now){
2606
1685
goto end;
2607
1686
}
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
1687
}
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
1688
close(devnull);
2613
1689
}
2614
1690
2615
1691
if(not debug){
2616
1692
avahi_set_log_function(empty_log);
2617
1693
}
2618
1694
1695
if(interface[0] == '\0'){
1696
struct dirent **direntries;
1697
ret = scandir(sys_class_net, &direntries, good_interface,
1698
alphasort);
1699
if(ret >= 1){
1700
/* Pick the first good interface */
1701
interface = strdup(direntries[0]->d_name);
1702
if(debug){
1703
fprintf(stderr, "Using interface \"%s\"\n", interface);
1704
}
1705
if(interface == NULL){
1706
perror_plus("malloc");
1707
free(direntries);
1708
exitcode = EXIT_FAILURE;
1709
goto end;
1710
}
1711
free(direntries);
1712
} else {
1713
free(direntries);
1714
fprintf(stderr, "Could not find a network interface\n");
1715
exitcode = EXIT_FAILURE;
1716
goto end;
1717
}
1718
}
1719
2619
1720
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2620
1721
from the signal handler */
2621
1722
/* Initialize the pseudo-RNG for Avahi */
2622
1723
srand((unsigned int) time(NULL));
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
2625
fprintf_plus(stderr,
2626
"Avahi: Failed to create simple poll object.\n");
1724
mc.simple_poll = avahi_simple_poll_new();
1725
if(mc.simple_poll == NULL){
1726
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2627
1727
exitcode = EX_UNAVAILABLE;
2628
1728
goto end;
2629
1729
}
2691
1791
}
2692
1792
}
2693
1793
2694
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2697
/* Look for any good interfaces */
2698
ret = scandir(sys_class_net, &direntries, good_interface,
2699
alphasort);
2700
if(ret >= 1){
2701
/* Add all found interfaces to interfaces list */
2702
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2704
direntries[i]->d_name);
2705
if(ret_errno != 0){
2706
errno = ret_errno;
2707
perror_plus("argz_add");
2708
free(direntries[i]);
2709
continue;
2710
}
2711
if(debug){
2712
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
direntries[i]->d_name);
2714
}
2715
free(direntries[i]);
2716
}
2717
free(direntries);
1794
/* If the interface is down, bring it up */
1795
if(strcmp(interface, "none") != 0){
1796
if_index = (AvahiIfIndex) if_nametoindex(interface);
1797
if(if_index == 0){
1798
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1799
exitcode = EX_UNAVAILABLE;
1800
goto end;
1801
}
1802
1803
if(quit_now){
1804
goto end;
1805
}
1806
1807
/* Re-raise priviliges */
1808
errno = 0;
1809
ret = seteuid(0);
1810
if(ret == -1){
1811
perror_plus("seteuid");
1812
}
1813
1814
#ifdef __linux__
1815
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1816
messages about the network interface to mess up the prompt */
1817
ret = klogctl(8, NULL, 5);
1818
bool restore_loglevel = true;
1819
if(ret == -1){
1820
restore_loglevel = false;
1821
perror_plus("klogctl");
1822
}
1823
#endif /* __linux__ */
1824
1825
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1826
if(sd < 0){
1827
perror_plus("socket");
1828
exitcode = EX_OSERR;
1829
#ifdef __linux__
1830
if(restore_loglevel){
1831
ret = klogctl(7, NULL, 0);
1832
if(ret == -1){
1833
perror_plus("klogctl");
1834
}
1835
}
1836
#endif /* __linux__ */
1837
/* Lower privileges */
1838
errno = 0;
1839
ret = seteuid(uid);
1840
if(ret == -1){
1841
perror_plus("seteuid");
1842
}
1843
goto end;
1844
}
1845
strcpy(network.ifr_name, interface);
1846
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1847
if(ret == -1){
1848
perror_plus("ioctl SIOCGIFFLAGS");
1849
#ifdef __linux__
1850
if(restore_loglevel){
1851
ret = klogctl(7, NULL, 0);
1852
if(ret == -1){
1853
perror_plus("klogctl");
1854
}
1855
}
1856
#endif /* __linux__ */
1857
exitcode = EX_OSERR;
1858
/* Lower privileges */
1859
errno = 0;
1860
ret = seteuid(uid);
1861
if(ret == -1){
1862
perror_plus("seteuid");
1863
}
1864
goto end;
1865
}
1866
if((network.ifr_flags & IFF_UP) == 0){
1867
network.ifr_flags |= IFF_UP;
1868
take_down_interface = true;
1869
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1870
if(ret == -1){
1871
take_down_interface = false;
1872
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1873
exitcode = EX_OSERR;
1874
#ifdef __linux__
1875
if(restore_loglevel){
1876
ret = klogctl(7, NULL, 0);
1877
if(ret == -1){
1878
perror_plus("klogctl");
1879
}
1880
}
1881
#endif /* __linux__ */
1882
/* Lower privileges */
1883
errno = 0;
1884
ret = seteuid(uid);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
goto end;
1889
}
1890
}
1891
/* Sleep checking until interface is running.
1892
Check every 0.25s, up to total time of delay */
1893
for(int i=0; i < delay * 4; i++){
1894
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1895
if(ret == -1){
1896
perror_plus("ioctl SIOCGIFFLAGS");
1897
} else if(network.ifr_flags & IFF_RUNNING){
1898
break;
1899
}
1900
struct timespec sleeptime = { .tv_nsec = 250000000 };
1901
ret = nanosleep(&sleeptime, NULL);
1902
if(ret == -1 and errno != EINTR){
1903
perror_plus("nanosleep");
1904
}
1905
}
1906
if(not take_down_interface){
1907
/* We won't need the socket anymore */
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1912
}
1913
#ifdef __linux__
1914
if(restore_loglevel){
1915
/* Restores kernel loglevel to default */
1916
ret = klogctl(7, NULL, 0);
1917
if(ret == -1){
1918
perror_plus("klogctl");
1919
}
1920
}
1921
#endif /* __linux__ */
1922
/* Lower privileges */
1923
errno = 0;
1924
if(take_down_interface){
1925
/* Lower privileges */
1926
ret = seteuid(uid);
1927
if(ret == -1){
1928
perror_plus("seteuid");
1929
}
2718
1930
} else {
2719
if(ret == 0){
2720
free(direntries);
2721
}
2722
fprintf_plus(stderr, "Could not find a network interface\n");
2723
exitcode = EXIT_FAILURE;
2724
goto end;
2725
}
2726
}
2727
2728
/* Bring up interfaces which are down, and remove any "none"s */
2729
{
2730
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2732
interface))){
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2737
interface);
2738
interface = NULL;
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
}
2746
}
2747
break;
2748
}
2749
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2751
if(not interface_was_up){
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2755
} else {
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2758
interface);
2759
if(errno != 0){
2760
perror_plus("argz_add");
2761
}
2762
}
2763
}
2764
}
2765
if(debug and (interfaces_to_take_down == NULL)){
2766
fprintf_plus(stderr, "No interfaces were brought up\n");
2767
}
2768
}
2769
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
if(debug){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2774
mc.interfaces);
2775
}
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1931
/* Lower privileges permanently */
1932
ret = setuid(uid);
1933
if(ret == -1){
1934
perror_plus("setuid");
1935
}
1936
}
2777
1937
}
2778
1938
2779
1939
if(quit_now){
2780
1940
goto end;
2781
1941
}
2782
1942
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1943
ret = init_gnutls_global(pubkey, seckey);
2784
1944
if(ret == -1){
2785
fprintf_plus(stderr, "init_gnutls_global failed\n");
1945
fprintf(stderr, "init_gnutls_global failed\n");
2786
1946
exitcode = EX_UNAVAILABLE;
2787
1947
goto end;
2788
1948
} else {
2793
1953
goto end;
2794
1954
}
2795
1955
2796
/* Try /run/tmp before /tmp */
2797
tempdir = mkdtemp(run_tempdir);
2798
if(tempdir == NULL and errno == ENOENT){
2799
if(debug){
2800
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2801
run_tempdir, old_tempdir);
2802
}
2803
tempdir = mkdtemp(old_tempdir);
2804
}
2805
if(tempdir == NULL){
1956
if(mkdtemp(tempdir) == NULL){
2806
1957
perror_plus("mkdtemp");
2807
1958
goto end;
2808
1959
}
1960
tempdir_created = true;
2809
1961
2810
1962
if(quit_now){
2811
1963
goto end;
2812
1964
}
2813
1965
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2815
fprintf_plus(stderr, "init_gpgme failed\n");
1966
if(not init_gpgme(pubkey, seckey, tempdir)){
1967
fprintf(stderr, "init_gpgme failed\n");
2816
1968
exitcode = EX_UNAVAILABLE;
2817
1969
goto end;
2818
1970
} else {
2827
1979
/* Connect directly, do not use Zeroconf */
2828
1980
/* (Mainly meant for debugging) */
2829
1981
char *address = strrchr(connect_to, ':');
2830
2831
1982
if(address == NULL){
2832
fprintf_plus(stderr, "No colon in address\n");
1983
fprintf(stderr, "No colon in address\n");
2833
1984
exitcode = EX_USAGE;
2834
1985
goto end;
2835
1986
}
2838
1989
goto end;
2839
1990
}
2840
1991
2841
in_port_t port;
1992
uint16_t port;
2842
1993
errno = 0;
2843
1994
tmpmax = strtoimax(address+1, &tmp, 10);
2844
1995
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2845
or tmpmax != (in_port_t)tmpmax){
2846
fprintf_plus(stderr, "Bad port number\n");
1996
or tmpmax != (uint16_t)tmpmax){
1997
fprintf(stderr, "Bad port number\n");
2847
1998
exitcode = EX_USAGE;
2848
1999
goto end;
2849
2000
}
2850
2001
2851
2002
if(quit_now){
2852
2003
goto end;
2853
2004
}
2854
2005
2855
port = (in_port_t)tmpmax;
2006
port = (uint16_t)tmpmax;
2856
2007
*address = '\0';
2857
2008
/* Colon in address indicates IPv6 */
2858
2009
int af;
2874
2025
}
2875
2026
2876
2027
while(not quit_now){
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2028
ret = start_mandos_communication(address, port, if_index, af);
2879
2029
if(quit_now or ret == 0){
2880
2030
break;
2881
2031
}
2882
2032
if(debug){
2883
fprintf_plus(stderr, "Retrying in %d seconds\n",
2884
(int)retry_interval);
2033
fprintf(stderr, "Retrying in %d seconds\n",
2034
(int)retry_interval);
2885
2035
}
2886
sleep((unsigned int)retry_interval);
2036
sleep((int)retry_interval);
2887
2037
}
2888
2038
2889
if(not quit_now){
2039
if (not quit_now){
2890
2040
exitcode = EXIT_SUCCESS;
2891
2041
}
2892
2042
2907
2057
config.publish_domain = 0;
2908
2058
2909
2059
/* Allocate a new server */
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret_errno);
2060
mc.server = avahi_server_new(avahi_simple_poll_get
2061
(mc.simple_poll), &config, NULL,
2062
NULL, &error);
2912
2063
2913
2064
/* Free the Avahi configuration data */
2914
2065
avahi_server_config_free(&config);
2916
2067
2917
2068
/* Check if creating the Avahi server object succeeded */
2918
2069
if(mc.server == NULL){
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2920
avahi_strerror(ret_errno));
2070
fprintf(stderr, "Failed to create Avahi server: %s\n",
2071
avahi_strerror(error));
2921
2072
exitcode = EX_UNAVAILABLE;
2922
2073
goto end;
2923
2074
}
2929
2080
/* Create the Avahi service browser */
2930
2081
sb = avahi_s_service_browser_new(mc.server, if_index,
2931
2082
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
2083
NULL, 0, browse_callback, NULL);
2934
2084
if(sb == NULL){
2935
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2936
avahi_strerror(avahi_server_errno(mc.server)));
2085
fprintf(stderr, "Failed to create service browser: %s\n",
2086
avahi_strerror(avahi_server_errno(mc.server)));
2937
2087
exitcode = EX_UNAVAILABLE;
2938
2088
goto end;
2939
2089
}
2945
2095
/* Run the main loop */
2946
2096
2947
2097
if(debug){
2948
fprintf_plus(stderr, "Starting Avahi loop search\n");
2098
fprintf(stderr, "Starting Avahi loop search\n");
2949
2099
}
2950
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2100
2101
ret = avahi_loop_with_timeout(mc.simple_poll,
2102
(int)(retry_interval * 1000));
2953
2103
if(debug){
2954
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2955
(ret == 0) ? "successfully" : "with error");
2104
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2105
(ret == 0) ? "successfully" : "with error");
2956
2106
}
2957
2107
2958
2108
end:
2959
2109
2960
2110
if(debug){
2961
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2111
fprintf(stderr, "%s exiting\n", argv[0]);
2962
2112
}
2963
2113
2964
2114
/* Cleanup things */
2965
free(mc.interfaces);
2966
2967
2115
if(sb != NULL)
2968
2116
avahi_s_service_browser_free(sb);
2969
2117
2970
2118
if(mc.server != NULL)
2971
2119
avahi_server_free(mc.server);
2972
2120
2973
if(simple_poll != NULL)
2974
avahi_simple_poll_free(simple_poll);
2121
if(mc.simple_poll != NULL)
2122
avahi_simple_poll_free(mc.simple_poll);
2975
2123
2976
2124
if(gnutls_initialized){
2977
2125
gnutls_certificate_free_credentials(mc.cred);
2982
2130
if(gpgme_initialized){
2983
2131
gpgme_release(mc.ctx);
2984
2132
}
2985
2133
2986
2134
/* Cleans up the circular linked list of Mandos servers the client
2987
2135
has seen */
2988
2136
if(mc.current_server != NULL){
2989
2137
mc.current_server->prev->next = NULL;
2990
2138
while(mc.current_server != NULL){
2991
2139
server *next = mc.current_server->next;
2992
#ifdef __GNUC__
2993
#pragma GCC diagnostic push
2994
#pragma GCC diagnostic ignored "-Wcast-qual"
2995
#endif
2996
free((char *)(mc.current_server->ip));
2997
#ifdef __GNUC__
2998
#pragma GCC diagnostic pop
2999
#endif
3000
2140
free(mc.current_server);
3001
2141
mc.current_server = next;
3002
2142
}
3003
2143
}
3004
2144
3005
/* Re-raise privileges */
3006
{
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3010
perror_plus("Failed to raise privileges");
3011
} else {
3012
3013
/* Run network hooks */
3014
run_network_hooks("stop", interfaces_hooks != NULL ?
3015
interfaces_hooks : "", delay);
3016
3017
/* Take down the network interfaces which were brought up */
3018
{
3019
char *interface = NULL;
3020
while((interface=argz_next(interfaces_to_take_down,
3021
interfaces_to_take_down_size,
3022
interface))){
3023
ret_errno = take_down_interface(interface);
3024
if(ret_errno != 0){
3025
errno = ret_errno;
3026
perror_plus("Failed to take down interface");
3027
}
3028
}
3029
if(debug and (interfaces_to_take_down == NULL)){
3030
fprintf_plus(stderr, "No interfaces needed to be taken"
3031
" down\n");
3032
}
3033
}
2145
/* XXX run network hooks "stop" here */
2146
2147
/* Take down the network interface */
2148
if(take_down_interface){
2149
/* Re-raise priviliges */
2150
errno = 0;
2151
ret = seteuid(0);
2152
if(ret == -1){
2153
perror_plus("seteuid");
3034
2154
}
3035
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3039
perror_plus("Failed to lower privileges permanently");
2155
if(geteuid() == 0){
2156
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2157
if(ret == -1){
2158
perror_plus("ioctl SIOCGIFFLAGS");
2159
} else if(network.ifr_flags & IFF_UP) {
2160
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2161
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2162
if(ret == -1){
2163
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2164
}
2165
}
2166
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2167
if(ret == -1){
2168
perror_plus("close");
2169
}
2170
/* Lower privileges permanently */
2171
errno = 0;
2172
ret = setuid(uid);
2173
if(ret == -1){
2174
perror_plus("setuid");
2175
}
3040
2176
}
3041
2177
}
3042
2178
3043
free(interfaces_to_take_down);
3044
free(interfaces_hooks);
3045
3046
2179
/* Removes the GPGME temp directory and all files inside */
3047
if(tempdir != NULL){
2180
if(tempdir_created){
3048
2181
struct dirent **direntries = NULL;
3049
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3050
| O_NOFOLLOW
3051
| O_DIRECTORY
3052
| O_PATH));
3053
if(tempdir_fd == -1){
3054
perror_plus("open");
3055
} else {
3056
#ifdef __GLIBC__
3057
#if __GLIBC_PREREQ(2, 15)
3058
int numentries = scandirat(tempdir_fd, ".", &direntries,
3059
notdotentries, alphasort);
3060
#else /* not __GLIBC_PREREQ(2, 15) */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC_PREREQ(2, 15) */
3064
#else /* not __GLIBC__ */
3065
int numentries = scandir(tempdir, &direntries, notdotentries,
3066
alphasort);
3067
#endif /* not __GLIBC__ */
3068
if(numentries >= 0){
3069
for(int i = 0; i < numentries; i++){
3070
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3071
if(ret == -1){
3072
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3073
" \"%s\", 0): %s\n", tempdir,
3074
direntries[i]->d_name, strerror(errno));
3075
}
3076
free(direntries[i]);
3077
}
3078
3079
/* need to clean even if 0 because man page doesn't specify */
3080
free(direntries);
3081
if(numentries == -1){
3082
perror_plus("scandir");
3083
}
3084
ret = rmdir(tempdir);
3085
if(ret == -1 and errno != ENOENT){
3086
perror_plus("rmdir");
3087
}
2182
struct dirent *direntry = NULL;
2183
int numentries = scandir(tempdir, &direntries, notdotentries,
2184
alphasort);
2185
if (numentries > 0){
2186
for(int i = 0; i < numentries; i++){
2187
direntry = direntries[i];
2188
char *fullname = NULL;
2189
ret = asprintf(&fullname, "%s/%s", tempdir,
2190
direntry->d_name);
2191
if(ret < 0){
2192
perror_plus("asprintf");
2193
continue;
2194
}
2195
ret = remove(fullname);
2196
if(ret == -1){
2197
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2198
strerror(errno));
2199
}
2200
free(fullname);
3088
2201
}
3089
close(tempdir_fd);
2202
}
2203
2204
/* need to clean even if 0 because man page doesn't specify */
2205
free(direntries);
2206
if (numentries == -1){
2207
perror_plus("scandir");
2208
}
2209
ret = rmdir(tempdir);
2210
if(ret == -1 and errno != ENOENT){
2211
perror_plus("rmdir");
3090
2212
}
3091
2213
}
3092
2214
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0