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- Committer: Teddy Hogeborn
- Date: 2015-07-27 09:23:56 UTC
- Revision ID: teddy@recompile.se-20150727092356-65ul6jsiozlkjw4e
Debian bug fix for mandos-client: Remove dhparams.pem on purge.
* debian/mandos-client.postrm (purge): Bug fix: Remove dhparams.pem.
* debian/mandos-client.postrm (purge): Bug fix: Remove dhparams.pem.
- files added:
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
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() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
85
86
raise() */
86
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
88
98
89
99
#ifdef __linux__
90
100
#include <sys/klog.h> /* klogctl() */
108
118
init_gnutls_session(),
109
119
GNUTLS_* */
110
120
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
113
123
114
124
/* GPGME */
115
125
#include <gpgme.h> /* All GPGME types, constants and
131
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
142
static const char sys_class_net[] = "/sys/class/net";
133
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
134
148
135
149
/* Doubly linked list that need to be circularly linked when used */
136
150
typedef struct server{
137
151
const char *ip;
138
uint16_t port;
152
in_port_t port;
139
153
AvahiIfIndex if_index;
140
154
int af;
141
155
struct timespec last_seen;
145
159
146
160
/* Used for passing in values through the Avahi callback functions */
147
161
typedef struct {
148
AvahiSimplePoll *simple_poll;
149
162
AvahiServer *server;
150
163
gnutls_certificate_credentials_t cred;
151
164
unsigned int dh_bits;
153
166
const char *priority;
154
167
gpgme_ctx_t ctx;
155
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
156
171
} mandos_context;
157
172
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 };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
163
175
164
176
sig_atomic_t quit_now = 0;
165
177
int signal_received = 0;
166
178
167
179
/* Function to use when printing errors */
168
180
void perror_plus(const char *print_text){
181
int e = errno;
169
182
fprintf(stderr, "Mandos plugin %s: ",
170
183
program_invocation_short_name);
184
errno = e;
171
185
perror(print_text);
172
186
}
173
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
174
189
int fprintf_plus(FILE *stream, const char *format, ...){
175
190
va_list ap;
176
191
va_start (ap, format);
177
192
178
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
179
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
180
196
}
181
197
182
198
/*
184
200
* bytes. "buffer_capacity" is how much is currently allocated,
185
201
* "buffer_length" is how much is already used.
186
202
*/
203
__attribute__((nonnull, warn_unused_result))
187
204
size_t incbuffer(char **buffer, size_t buffer_length,
188
size_t buffer_capacity){
205
size_t buffer_capacity){
189
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
190
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
191
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
192
213
return 0;
193
214
}
215
*buffer = new_buf;
194
216
buffer_capacity += BUFFER_SIZE;
195
217
}
196
218
return buffer_capacity;
197
219
}
198
220
199
221
/* Add server to set of servers to retry periodically */
200
int add_server(const char *ip, uint16_t port,
201
AvahiIfIndex if_index,
202
int af){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
203
225
int ret;
204
226
server *new_server = malloc(sizeof(server));
205
227
if(new_server == NULL){
206
228
perror_plus("malloc");
207
return -1;
229
return false;
208
230
}
209
231
*new_server = (server){ .ip = strdup(ip),
210
.port = port,
211
.if_index = if_index,
212
.af = af };
232
.port = port,
233
.if_index = if_index,
234
.af = af };
213
235
if(new_server->ip == NULL){
214
236
perror_plus("strdup");
215
return -1;
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#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;
216
253
}
217
254
/* Special case of first server */
218
if (mc.current_server == NULL){
255
if(*current_server == NULL){
219
256
new_server->next = new_server;
220
257
new_server->prev = new_server;
221
mc.current_server = new_server;
222
/* Place the new server last in the list */
258
*current_server = new_server;
223
259
} else {
224
new_server->next = mc.current_server;
225
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
226
263
new_server->prev->next = new_server;
227
mc.current_server->prev = new_server;
228
}
229
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
230
if(ret == -1){
231
perror_plus("clock_gettime");
232
return -1;
233
}
234
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
235
267
}
236
268
237
269
/*
238
270
* Initialize GPGME.
239
271
*/
240
static bool init_gpgme(const char *seckey,
241
const char *pubkey, const char *tempdir){
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){
242
277
gpgme_error_t rc;
243
278
gpgme_engine_info_t engine_info;
244
279
245
246
280
/*
247
281
* Helper function to insert pub and seckey to the engine keyring.
248
282
*/
249
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
250
284
int ret;
251
285
int fd;
252
286
gpgme_data_t pgp_data;
259
293
260
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
261
295
if(rc != GPG_ERR_NO_ERROR){
262
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
263
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
264
298
return false;
265
299
}
266
300
267
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
268
302
if(rc != GPG_ERR_NO_ERROR){
269
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
271
305
return false;
272
306
}
273
307
274
ret = (int)TEMP_FAILURE_RETRY(close(fd));
308
ret = close(fd);
275
309
if(ret == -1){
276
310
perror_plus("close");
277
311
}
280
314
}
281
315
282
316
if(debug){
283
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
284
318
}
285
319
286
320
/* Init GPGME */
287
321
gpgme_check_version(NULL);
288
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
289
323
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
292
326
return false;
293
327
}
294
328
295
329
/* Set GPGME home directory for the OpenPGP engine only */
296
330
rc = gpgme_get_engine_info(&engine_info);
297
331
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
300
334
return false;
301
335
}
302
336
while(engine_info != NULL){
308
342
engine_info = engine_info->next;
309
343
}
310
344
if(engine_info == NULL){
311
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
312
347
return false;
313
348
}
314
349
315
350
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
317
352
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "bad gpgme_new: %s: %s\n",
319
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
320
356
return false;
321
357
}
322
358
331
367
* Decrypt OpenPGP data.
332
368
* Returns -1 on error
333
369
*/
370
__attribute__((nonnull, warn_unused_result))
334
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
335
372
size_t crypto_size,
336
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
337
375
gpgme_data_t dh_crypto, dh_plain;
338
376
gpgme_error_t rc;
339
377
ssize_t ret;
341
379
ssize_t plaintext_length = 0;
342
380
343
381
if(debug){
344
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
345
383
}
346
384
347
385
/* Create new GPGME data buffer from memory cryptotext */
348
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
349
387
0);
350
388
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
353
391
return -1;
354
392
}
355
393
356
394
/* Create new empty GPGME data buffer for the plaintext */
357
395
rc = gpgme_data_new(&dh_plain);
358
396
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
361
400
gpgme_data_release(dh_crypto);
362
401
return -1;
363
402
}
364
403
365
404
/* Decrypt data from the cryptotext data buffer to the plaintext
366
405
data buffer */
367
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
368
407
if(rc != GPG_ERR_NO_ERROR){
369
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
371
410
plaintext_length = -1;
372
411
if(debug){
373
412
gpgme_decrypt_result_t result;
374
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
375
414
if(result == NULL){
376
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
377
416
} else {
378
fprintf(stderr, "Unsupported algorithm: %s\n",
379
result->unsupported_algorithm);
380
fprintf(stderr, "Wrong key usage: %u\n",
381
result->wrong_key_usage);
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);
382
421
if(result->file_name != NULL){
383
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
384
423
}
385
424
gpgme_recipient_t recipient;
386
425
recipient = result->recipients;
387
426
while(recipient != NULL){
388
fprintf(stderr, "Public key algorithm: %s\n",
389
gpgme_pubkey_algo_name(recipient->pubkey_algo));
390
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
391
fprintf(stderr, "Secret key available: %s\n",
392
recipient->status == GPG_ERR_NO_SECKEY
393
? "No" : "Yes");
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");
394
434
recipient = recipient->next;
395
435
}
396
436
}
399
439
}
400
440
401
441
if(debug){
402
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
403
443
}
404
444
405
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
412
452
*plaintext = NULL;
413
453
while(true){
414
454
plaintext_capacity = incbuffer(plaintext,
415
(size_t)plaintext_length,
416
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
417
457
if(plaintext_capacity == 0){
418
perror_plus("incbuffer");
419
plaintext_length = -1;
420
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
421
461
}
422
462
423
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
436
476
}
437
477
438
478
if(debug){
439
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
440
480
for(ssize_t i = 0; i < plaintext_length; i++){
441
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
442
482
}
453
493
return plaintext_length;
454
494
}
455
495
456
static const char * safer_gnutls_strerror(int value){
457
const char *ret = gnutls_strerror(value); /* Spurious warning from
458
-Wunreachable-code */
459
if(ret == NULL)
460
ret = "(unknown)";
461
return ret;
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);
462
507
}
463
508
464
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
465
511
static void debuggnutls(__attribute__((unused)) int level,
466
512
const char* string){
467
fprintf(stderr, "GnuTLS: %s", string);
513
fprintf_plus(stderr, "GnuTLS: %s", string);
468
514
}
469
515
516
__attribute__((nonnull, warn_unused_result))
470
517
static int init_gnutls_global(const char *pubkeyfilename,
471
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
472
521
int ret;
522
unsigned int uret;
473
523
474
524
if(debug){
475
fprintf(stderr, "Initializing GnuTLS\n");
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
476
526
}
477
527
478
528
ret = gnutls_global_init();
479
529
if(ret != GNUTLS_E_SUCCESS){
480
fprintf(stderr, "GnuTLS global_init: %s\n",
481
safer_gnutls_strerror(ret));
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
482
532
return -1;
483
533
}
484
534
491
541
}
492
542
493
543
/* OpenPGP credentials */
494
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
495
545
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "GnuTLS memory error: %s\n",
497
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
498
548
gnutls_global_deinit();
499
549
return -1;
500
550
}
501
551
502
552
if(debug){
503
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
504
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
505
seckeyfilename);
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
506
557
}
507
558
508
559
ret = gnutls_certificate_set_openpgp_key_file
509
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
510
561
GNUTLS_OPENPGP_FMT_BASE64);
511
562
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr,
513
"Error[%d] while reading the OpenPGP key pair ('%s',"
514
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
515
fprintf(stderr, "The GnuTLS error is: %s\n",
516
safer_gnutls_strerror(ret));
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));
517
568
goto globalfail;
518
569
}
519
570
520
571
/* GnuTLS server initialization */
521
ret = gnutls_dh_params_init(&mc.dh_params);
522
if(ret != GNUTLS_E_SUCCESS){
523
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
524
" %s\n", safer_gnutls_strerror(ret));
525
goto globalfail;
526
}
527
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
530
safer_gnutls_strerror(ret));
531
goto globalfail;
532
}
533
534
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
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);
535
752
536
753
return 0;
537
754
538
755
globalfail:
539
756
540
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
541
758
gnutls_global_deinit();
542
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
543
760
return -1;
544
761
}
545
762
546
static int init_gnutls_session(gnutls_session_t *session){
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
547
766
int ret;
548
767
/* GnuTLS session creation */
549
768
do {
553
772
}
554
773
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
555
774
if(ret != GNUTLS_E_SUCCESS){
556
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
557
safer_gnutls_strerror(ret));
775
fprintf_plus(stderr,
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
558
778
}
559
779
560
780
{
561
781
const char *err;
562
782
do {
563
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
564
784
if(quit_now){
565
785
gnutls_deinit(*session);
566
786
return -1;
567
787
}
568
788
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
569
789
if(ret != GNUTLS_E_SUCCESS){
570
fprintf(stderr, "Syntax error at: %s\n", err);
571
fprintf(stderr, "GnuTLS error: %s\n",
572
safer_gnutls_strerror(ret));
790
fprintf_plus(stderr, "Syntax error at: %s\n", err);
791
fprintf_plus(stderr, "GnuTLS error: %s\n",
792
safer_gnutls_strerror(ret));
573
793
gnutls_deinit(*session);
574
794
return -1;
575
795
}
577
797
578
798
do {
579
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
580
mc.cred);
800
mc->cred);
581
801
if(quit_now){
582
802
gnutls_deinit(*session);
583
803
return -1;
584
804
}
585
805
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
586
806
if(ret != GNUTLS_E_SUCCESS){
587
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
588
safer_gnutls_strerror(ret));
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
589
809
gnutls_deinit(*session);
590
810
return -1;
591
811
}
593
813
/* ignore client certificate if any. */
594
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
595
815
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
597
598
816
return 0;
599
817
}
600
818
602
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
603
821
__attribute__((unused)) const char *txt){}
604
822
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
605
1041
/* Called when a Mandos server is found */
606
static int start_mandos_communication(const char *ip, uint16_t port,
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
607
1044
AvahiIfIndex if_index,
608
int af){
1045
int af, mandos_context *mc){
609
1046
int ret, tcp_sd = -1;
610
1047
ssize_t sret;
611
union {
612
struct sockaddr_in in;
613
struct sockaddr_in6 in6;
614
} to;
1048
struct sockaddr_storage to;
615
1049
char *buffer = NULL;
616
1050
char *decrypted_buffer = NULL;
617
1051
size_t buffer_length = 0;
620
1054
int retval = -1;
621
1055
gnutls_session_t session;
622
1056
int pf; /* Protocol family */
1057
bool route_added = false;
623
1058
624
1059
errno = 0;
625
1060
636
1071
pf = PF_INET;
637
1072
break;
638
1073
default:
639
fprintf(stderr, "Bad address family: %d\n", af);
1074
fprintf_plus(stderr, "Bad address family: %d\n", af);
640
1075
errno = EINVAL;
641
1076
return -1;
642
1077
}
643
1078
644
ret = init_gnutls_session(&session);
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);
645
1112
if(ret != 0){
646
1113
return -1;
647
1114
}
648
1115
649
1116
if(debug){
650
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
"\n", ip, port);
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
652
1119
}
653
1120
654
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
655
1122
if(tcp_sd < 0){
656
1123
int e = errno;
657
1124
perror_plus("socket");
664
1131
goto mandos_end;
665
1132
}
666
1133
667
memset(&to, 0, sizeof(to));
668
1134
if(af == AF_INET6){
669
to.in6.sin6_family = (sa_family_t)af;
670
ret = inet_pton(af, ip, &to.in6.sin6_addr);
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);
671
1138
} else { /* IPv4 */
672
to.in.sin_family = (sa_family_t)af;
673
ret = inet_pton(af, ip, &to.in.sin_addr);
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);
674
1142
}
675
1143
if(ret < 0 ){
676
1144
int e = errno;
680
1148
}
681
1149
if(ret == 0){
682
1150
int e = errno;
683
fprintf(stderr, "Bad address: %s\n", ip);
1151
fprintf_plus(stderr, "Bad address: %s\n", ip);
684
1152
errno = e;
685
1153
goto mandos_end;
686
1154
}
687
1155
if(af == AF_INET6){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
695
1159
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
" incomplete without a network interface\n");
698
1162
errno = EINVAL;
699
1163
goto mandos_end;
700
1164
}
701
1165
/* Set the network interface number as scope */
702
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
703
1167
}
704
1168
} else {
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
708
1170
}
709
1171
710
1172
if(quit_now){
718
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
1181
perror_plus("if_indextoname");
720
1182
} else {
721
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
723
1185
}
724
1186
} else {
725
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
726
port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
727
1189
}
728
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
729
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
const char *pcret;
731
if(af == AF_INET6){
732
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
733
sizeof(addrstr));
734
} else {
735
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
736
sizeof(addrstr));
737
}
738
if(pcret == NULL){
739
perror_plus("inet_ntop");
740
} else {
741
if(strcmp(addrstr, ip) != 0){
742
fprintf(stderr, "Canonical address form: %s\n", addrstr);
743
}
744
}
745
}
746
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
if(af == AF_INET6){
753
ret = connect(tcp_sd, &to.in6, sizeof(to));
754
} else {
755
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
756
}
757
if(ret < 0){
758
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
759
int e = errno;
760
perror_plus("connect");
761
errno = e;
762
}
763
goto mandos_end;
764
}
765
766
if(quit_now){
767
errno = EINTR;
768
goto mandos_end;
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
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;
769
1272
}
770
1273
771
1274
const char *out = mandos_protocol_version;
773
1276
while(true){
774
1277
size_t out_size = strlen(out);
775
1278
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
776
out_size - written));
1279
out_size - written));
777
1280
if(ret == -1){
778
1281
int e = errno;
779
1282
perror_plus("write");
799
1302
}
800
1303
801
1304
if(debug){
802
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1305
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
803
1306
}
804
1307
805
1308
if(quit_now){
807
1310
goto mandos_end;
808
1311
}
809
1312
810
/* Spurious warning from -Wint-to-pointer-cast */
811
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
812
1318
813
1319
if(quit_now){
814
1320
errno = EINTR;
825
1331
826
1332
if(ret != GNUTLS_E_SUCCESS){
827
1333
if(debug){
828
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1334
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
829
1335
gnutls_perror(ret);
830
1336
}
831
1337
errno = EPROTO;
835
1341
/* Read OpenPGP packet that contains the wanted password */
836
1342
837
1343
if(debug){
838
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
839
ip);
1344
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1345
" %s\n", ip);
840
1346
}
841
1347
842
1348
while(true){
847
1353
}
848
1354
849
1355
buffer_capacity = incbuffer(&buffer, buffer_length,
850
buffer_capacity);
1356
buffer_capacity);
851
1357
if(buffer_capacity == 0){
852
1358
int e = errno;
853
1359
perror_plus("incbuffer");
880
1386
}
881
1387
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
882
1388
if(ret < 0){
883
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1389
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1390
"***\n");
884
1391
gnutls_perror(ret);
885
1392
errno = EPROTO;
886
1393
goto mandos_end;
887
1394
}
888
1395
break;
889
1396
default:
890
fprintf(stderr, "Unknown error while reading data from"
891
" encrypted session with Mandos server\n");
1397
fprintf_plus(stderr, "Unknown error while reading data from"
1398
" encrypted session with Mandos server\n");
892
1399
gnutls_bye(session, GNUTLS_SHUT_RDWR);
893
1400
errno = EIO;
894
1401
goto mandos_end;
899
1406
}
900
1407
901
1408
if(debug){
902
fprintf(stderr, "Closing TLS session\n");
1409
fprintf_plus(stderr, "Closing TLS session\n");
903
1410
}
904
1411
905
1412
if(quit_now){
917
1424
918
1425
if(buffer_length > 0){
919
1426
ssize_t decrypted_buffer_size;
920
decrypted_buffer_size = pgp_packet_decrypt(buffer,
921
buffer_length,
922
&decrypted_buffer);
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
923
1429
if(decrypted_buffer_size >= 0){
924
1430
925
1431
written = 0;
935
1441
if(ret == 0 and ferror(stdout)){
936
1442
int e = errno;
937
1443
if(debug){
938
fprintf(stderr, "Error writing encrypted data: %s\n",
939
strerror(errno));
1444
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1445
strerror(errno));
940
1446
}
941
1447
errno = e;
942
1448
goto mandos_end;
951
1457
952
1458
mandos_end:
953
1459
{
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
}
954
1466
int e = errno;
955
1467
free(decrypted_buffer);
956
1468
free(buffer);
957
1469
if(tcp_sd >= 0){
958
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1470
ret = close(tcp_sd);
959
1471
}
960
1472
if(ret == -1){
961
1473
if(e == 0){
973
1485
return retval;
974
1486
}
975
1487
1488
__attribute__((nonnull))
976
1489
static void resolve_callback(AvahiSServiceResolver *r,
977
1490
AvahiIfIndex interface,
978
1491
AvahiProtocol proto,
986
1499
AVAHI_GCC_UNUSED AvahiStringList *txt,
987
1500
AVAHI_GCC_UNUSED AvahiLookupResultFlags
988
1501
flags,
989
AVAHI_GCC_UNUSED void* userdata){
990
assert(r);
1502
void *mc){
1503
if(r == NULL){
1504
return;
1505
}
991
1506
992
1507
/* Called whenever a service has been resolved successfully or
993
1508
timed out */
994
1509
995
1510
if(quit_now){
1511
avahi_s_service_resolver_free(r);
996
1512
return;
997
1513
}
998
1514
999
1515
switch(event){
1000
1516
default:
1001
1517
case AVAHI_RESOLVER_FAILURE:
1002
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1003
" of type '%s' in domain '%s': %s\n", name, type, domain,
1004
avahi_strerror(avahi_server_errno(mc.server)));
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)));
1005
1523
break;
1006
1524
1007
1525
case AVAHI_RESOLVER_FOUND:
1009
1527
char ip[AVAHI_ADDRESS_STR_MAX];
1010
1528
avahi_address_snprint(ip, sizeof(ip), address);
1011
1529
if(debug){
1012
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1013
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1014
ip, (intmax_t)interface, port);
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);
1015
1533
}
1016
int ret = start_mandos_communication(ip, port, interface,
1017
avahi_proto_to_af(proto));
1534
int ret = start_mandos_communication(ip, (in_port_t)port,
1535
interface,
1536
avahi_proto_to_af(proto),
1537
mc);
1018
1538
if(ret == 0){
1019
avahi_simple_poll_quit(mc.simple_poll);
1539
avahi_simple_poll_quit(simple_poll);
1020
1540
} else {
1021
ret = add_server(ip, port, interface,
1022
avahi_proto_to_af(proto));
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
}
1023
1547
}
1024
1548
}
1025
1549
}
1035
1559
const char *domain,
1036
1560
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1037
1561
flags,
1038
AVAHI_GCC_UNUSED void* userdata){
1039
assert(b);
1562
void *mc){
1563
if(b == NULL){
1564
return;
1565
}
1040
1566
1041
1567
/* Called whenever a new services becomes available on the LAN or
1042
1568
is removed from the LAN */
1049
1575
default:
1050
1576
case AVAHI_BROWSER_FAILURE:
1051
1577
1052
fprintf(stderr, "(Avahi browser) %s\n",
1053
avahi_strerror(avahi_server_errno(mc.server)));
1054
avahi_simple_poll_quit(mc.simple_poll);
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);
1055
1582
return;
1056
1583
1057
1584
case AVAHI_BROWSER_NEW:
1060
1587
the callback function is called the Avahi server will free the
1061
1588
resolver for us. */
1062
1589
1063
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1064
name, type, domain, protocol, 0,
1065
resolve_callback, NULL) == NULL)
1066
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1067
name, avahi_strerror(avahi_server_errno(mc.server)));
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)));
1068
1598
break;
1069
1599
1070
1600
case AVAHI_BROWSER_REMOVE:
1073
1603
case AVAHI_BROWSER_ALL_FOR_NOW:
1074
1604
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1075
1605
if(debug){
1076
fprintf(stderr, "No Mandos server found, still searching...\n");
1606
fprintf_plus(stderr, "No Mandos server found, still"
1607
" searching...\n");
1077
1608
}
1078
1609
break;
1079
1610
}
1088
1619
signal_received = sig;
1089
1620
int old_errno = errno;
1090
1621
/* set main loop to exit */
1091
if(mc.simple_poll != NULL){
1092
avahi_simple_poll_quit(mc.simple_poll);
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1093
1624
}
1094
1625
errno = old_errno;
1095
1626
}
1096
1627
1628
__attribute__((nonnull, warn_unused_result))
1097
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1098
1630
int ret;
1631
error_t ret_errno;
1099
1632
1100
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1101
1634
if(s < 0){
1635
ret_errno = errno;
1102
1636
perror_plus("socket");
1637
errno = ret_errno;
1103
1638
return false;
1104
1639
}
1105
1640
strcpy(ifr->ifr_name, ifname);
1106
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1107
1642
if(ret == -1){
1108
1643
if(debug){
1644
ret_errno = errno;
1109
1645
perror_plus("ioctl SIOCGIFFLAGS");
1646
errno = ret_errno;
1110
1647
}
1111
1648
return false;
1112
1649
}
1113
1650
return true;
1114
1651
}
1115
1652
1653
__attribute__((nonnull, warn_unused_result))
1116
1654
bool good_flags(const char *ifname, const struct ifreq *ifr){
1117
1655
1118
1656
/* Reject the loopback device */
1119
1657
if(ifr->ifr_flags & IFF_LOOPBACK){
1120
1658
if(debug){
1121
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1122
ifname);
1659
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1660
ifname);
1123
1661
}
1124
1662
return false;
1125
1663
}
1126
1664
/* Accept point-to-point devices only if connect_to is specified */
1127
1665
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1128
1666
if(debug){
1129
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1130
ifname);
1667
fprintf_plus(stderr, "Accepting point-to-point interface"
1668
" \"%s\"\n", ifname);
1131
1669
}
1132
1670
return true;
1133
1671
}
1134
1672
/* Otherwise, reject non-broadcast-capable devices */
1135
1673
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1136
1674
if(debug){
1137
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1138
ifname);
1675
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1676
" \"%s\"\n", ifname);
1139
1677
}
1140
1678
return false;
1141
1679
}
1142
1680
/* Reject non-ARP interfaces (including dummy interfaces) */
1143
1681
if(ifr->ifr_flags & IFF_NOARP){
1144
1682
if(debug){
1145
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1683
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1684
ifname);
1146
1685
}
1147
1686
return false;
1148
1687
}
1149
1688
1150
1689
/* Accept this device */
1151
1690
if(debug){
1152
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1691
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1153
1692
}
1154
1693
return true;
1155
1694
}
1159
1698
* corresponds to an acceptable network device.
1160
1699
* (This function is passed to scandir(3) as a filter function.)
1161
1700
*/
1701
__attribute__((nonnull, warn_unused_result))
1162
1702
int good_interface(const struct dirent *if_entry){
1163
int ret;
1164
1703
if(if_entry->d_name[0] == '.'){
1165
1704
return 0;
1166
1705
}
1706
1167
1707
struct ifreq ifr;
1168
1169
1708
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
}
1170
1713
return 0;
1171
1714
}
1172
1715
1177
1720
}
1178
1721
1179
1722
/*
1180
* This function determines if a directory entry in /sys/class/net
1181
* corresponds to an acceptable network device which is up.
1182
* (This function is passed to scandir(3) as a filter function.)
1183
*/
1184
int up_interface(const struct dirent *if_entry){
1185
ssize_t ssret;
1186
char *flagname = NULL;
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1191
if_entry->d_name);
1192
if(ret < 0){
1193
perror_plus("asprintf");
1194
return 0;
1195
}
1196
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1197
if(flags_fd == -1){
1198
perror_plus("open");
1199
free(flagname);
1200
return 0;
1201
}
1202
free(flagname);
1203
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1204
/* read line from flags_fd */
1205
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1206
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1207
flagstring[(size_t)to_read] = '\0';
1208
if(flagstring == NULL){
1209
perror_plus("malloc");
1210
close(flags_fd);
1211
return 0;
1212
}
1213
while(to_read > 0){
1214
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1215
(size_t)to_read));
1216
if(ssret == -1){
1217
perror_plus("read");
1218
free(flagstring);
1219
close(flags_fd);
1220
return 0;
1221
}
1222
to_read -= ssret;
1223
if(ssret == 0){
1224
break;
1225
}
1226
}
1227
close(flags_fd);
1228
intmax_t tmpmax;
1229
char *tmp;
1230
errno = 0;
1231
tmpmax = strtoimax(flagstring, &tmp, 0);
1232
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1233
and not (isspace(*tmp)))
1234
or tmpmax != (ifreq_flags)tmpmax){
1235
if(debug){
1236
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1237
flagstring, if_entry->d_name);
1238
}
1239
free(flagstring);
1240
return 0;
1241
}
1242
free(flagstring);
1243
ifreq_flags flags = (ifreq_flags)tmpmax;
1244
/* Reject the loopback device */
1245
if(flags & IFF_LOOPBACK){
1246
if(debug){
1247
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject down interfaces */
1254
if(not (flags & IFF_UP)){
1255
return 0;
1256
}
1257
1258
/* Accept point-to-point devices only if connect_to is specified */
1259
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1260
if(debug){
1261
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 1;
1265
}
1266
/* Otherwise, reject non-broadcast-capable devices */
1267
if(not (flags & IFF_BROADCAST)){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Reject non-ARP interfaces (including dummy interfaces) */
1275
if(flags & IFF_NOARP){
1276
if(debug){
1277
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1278
if_entry->d_name);
1279
}
1280
return 0;
1281
}
1282
/* Accept this device */
1283
if(debug){
1284
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1285
if_entry->d_name);
1286
}
1287
return 1;
1288
}
1289
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))
1290
1757
int notdotentries(const struct dirent *direntry){
1291
1758
/* Skip "." and ".." */
1292
1759
if(direntry->d_name[0] == '.'
1299
1766
}
1300
1767
1301
1768
/* Is this directory entry a runnable program? */
1769
__attribute__((nonnull, warn_unused_result))
1302
1770
int runnable_hook(const struct dirent *direntry){
1303
1771
int ret;
1772
size_t sret;
1304
1773
struct stat st;
1305
1774
1306
1775
if((direntry->d_name)[0] == '\0'){
1308
1777
return 0;
1309
1778
}
1310
1779
1311
/* Save pointer to last character */
1312
char *end = strchr(direntry->d_name, '\0')-1;
1313
1314
if(*end == '~'){
1315
/* Backup name~ */
1316
return 0;
1317
}
1318
1319
if(((direntry->d_name)[0] == '#')
1320
and (*end == '#')){
1321
/* Temporary #name# */
1322
return 0;
1323
}
1324
1325
/* XXX more rules here */
1326
1327
ret = stat(direntry->d_name, &st);
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);
1328
1794
if(ret == -1){
1329
1795
if(debug){
1330
perror_plus("Could not stat plugin");
1796
perror_plus("Could not stat hook");
1331
1797
}
1332
1798
return 0;
1333
1799
}
1334
if(not (st.st_mode & S_ISREG)){
1800
if(not (S_ISREG(st.st_mode))){
1335
1801
/* Not a regular file */
1802
if(debug){
1803
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1804
direntry->d_name);
1805
}
1336
1806
return 0;
1337
1807
}
1338
1808
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1339
1809
/* Not executable */
1810
if(debug){
1811
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1812
direntry->d_name);
1813
}
1340
1814
return 0;
1341
1815
}
1816
if(debug){
1817
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1818
direntry->d_name);
1819
}
1342
1820
return 1;
1343
1821
}
1344
1822
1345
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1823
__attribute__((nonnull, warn_unused_result))
1824
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1825
mandos_context *mc){
1346
1826
int ret;
1347
1827
struct timespec now;
1348
1828
struct timespec waited_time;
1349
1829
intmax_t block_time;
1350
1830
1351
1831
while(true){
1352
if(mc.current_server == NULL){
1353
if (debug){
1354
fprintf(stderr,
1355
"Wait until first server is found. No timeout!\n");
1832
if(mc->current_server == NULL){
1833
if(debug){
1834
fprintf_plus(stderr, "Wait until first server is found."
1835
" No timeout!\n");
1356
1836
}
1357
1837
ret = avahi_simple_poll_iterate(s, -1);
1358
1838
} else {
1359
if (debug){
1360
fprintf(stderr, "Check current_server if we should run it,"
1361
" or wait\n");
1839
if(debug){
1840
fprintf_plus(stderr, "Check current_server if we should run"
1841
" it, or wait\n");
1362
1842
}
1363
1843
/* the current time */
1364
1844
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1369
1849
/* Calculating in ms how long time between now and server
1370
1850
who we visted longest time ago. Now - last seen. */
1371
1851
waited_time.tv_sec = (now.tv_sec
1372
- mc.current_server->last_seen.tv_sec);
1852
- mc->current_server->last_seen.tv_sec);
1373
1853
waited_time.tv_nsec = (now.tv_nsec
1374
- mc.current_server->last_seen.tv_nsec);
1854
- mc->current_server->last_seen.tv_nsec);
1375
1855
/* total time is 10s/10,000ms.
1376
1856
Converting to s from ms by dividing by 1,000,
1377
1857
and ns to ms by dividing by 1,000,000. */
1379
1859
- ((intmax_t)waited_time.tv_sec * 1000))
1380
1860
- ((intmax_t)waited_time.tv_nsec / 1000000));
1381
1861
1382
if (debug){
1383
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1862
if(debug){
1863
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1864
block_time);
1384
1865
}
1385
1866
1386
1867
if(block_time <= 0){
1387
ret = start_mandos_communication(mc.current_server->ip,
1388
mc.current_server->port,
1389
mc.current_server->if_index,
1390
mc.current_server->af);
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);
1391
1872
if(ret == 0){
1392
avahi_simple_poll_quit(mc.simple_poll);
1873
avahi_simple_poll_quit(s);
1393
1874
return 0;
1394
1875
}
1395
1876
ret = clock_gettime(CLOCK_MONOTONIC,
1396
&mc.current_server->last_seen);
1877
&mc->current_server->last_seen);
1397
1878
if(ret == -1){
1398
1879
perror_plus("clock_gettime");
1399
1880
return -1;
1400
1881
}
1401
mc.current_server = mc.current_server->next;
1882
mc->current_server = mc->current_server->next;
1402
1883
block_time = 0; /* Call avahi to find new Mandos
1403
1884
servers, but don't block */
1404
1885
}
1406
1887
ret = avahi_simple_poll_iterate(s, (int)block_time);
1407
1888
}
1408
1889
if(ret != 0){
1409
if (ret > 0 or errno != EINTR) {
1890
if(ret > 0 or errno != EINTR){
1410
1891
return (ret != 1) ? ret : 0;
1411
1892
}
1412
1893
}
1413
1894
}
1414
1895
}
1415
1896
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
1416
2289
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 };
1417
2295
AvahiSServiceBrowser *sb = NULL;
1418
int error;
2296
error_t ret_errno;
1419
2297
int ret;
1420
2298
intmax_t tmpmax;
1421
2299
char *tmp;
1422
2300
int exitcode = EXIT_SUCCESS;
1423
const char *interface = "";
1424
struct ifreq network;
1425
int sd = -1;
1426
bool take_down_interface = false;
1427
uid_t uid;
1428
gid_t gid;
1429
char tempdir[] = "/tmp/mandosXXXXXX";
1430
bool tempdir_created = false;
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;
1431
2306
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1432
2307
const char *seckey = PATHDIR "/" SECKEY;
1433
2308
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
char *interfaces_hooks = NULL;
1434
2311
1435
2312
bool gnutls_initialized = false;
1436
2313
bool gpgme_initialized = false;
1488
2365
.doc = "Bit length of the prime number used in the"
1489
2366
" Diffie-Hellman key exchange",
1490
2367
.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 },
1491
2373
{ .name = "priority", .key = 130,
1492
2374
.arg = "STRING",
1493
2375
.doc = "GnuTLS priority string for the TLS handshake",
1498
2380
.group = 2 },
1499
2381
{ .name = "retry", .key = 132,
1500
2382
.arg = "SECONDS",
1501
.doc = "Retry interval used when denied by the mandos server",
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",
1502
2388
.group = 2 },
1503
2389
/*
1504
2390
* These reproduce what we would get without ARGP_NO_HELP
1523
2409
connect_to = arg;
1524
2410
break;
1525
2411
case 'i': /* --interface */
1526
interface = arg;
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
}
1527
2417
break;
1528
2418
case 's': /* --seckey */
1529
2419
seckey = arg;
1540
2430
}
1541
2431
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1542
2432
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
1543
2436
case 130: /* --priority */
1544
2437
mc.priority = arg;
1545
2438
break;
1558
2451
argp_error(state, "Bad retry interval");
1559
2452
}
1560
2453
break;
2454
case 133: /* --network-hook-dir */
2455
hookdir = arg;
2456
break;
1561
2457
/*
1562
2458
* These reproduce what we would get without ARGP_NO_HELP
1563
2459
*/
1569
2465
argp_state_help(state, state->out_stream,
1570
2466
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1571
2467
case 'V': /* --version */
1572
fprintf(state->out_stream, "%s\n", argp_program_version);
2468
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1573
2469
exit(argp_err_exit_status);
1574
2470
break;
1575
2471
default:
1598
2494
goto end;
1599
2495
}
1600
2496
}
1601
2497
1602
2498
{
1603
2499
/* Work around Debian bug #633582:
1604
2500
<http://bugs.debian.org/633582> */
1605
struct stat st;
1606
1607
/* Re-raise priviliges */
1608
errno = 0;
1609
ret = seteuid(0);
1610
if(ret == -1){
1611
perror_plus("seteuid");
1612
}
1613
1614
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1615
int seckey_fd = open(seckey, O_RDONLY);
1616
if(seckey_fd == -1){
1617
perror_plus("open");
1618
} else {
1619
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1620
if(ret == -1){
1621
perror_plus("fstat");
1622
} else {
1623
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1624
ret = fchown(seckey_fd, uid, gid);
1625
if(ret == -1){
1626
perror_plus("fchown");
1627
}
1628
}
1629
}
1630
TEMP_FAILURE_RETRY(close(seckey_fd));
1631
}
1632
}
1633
1634
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1635
int pubkey_fd = open(pubkey, O_RDONLY);
1636
if(pubkey_fd == -1){
1637
perror_plus("open");
1638
} else {
1639
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1640
if(ret == -1){
1641
perror_plus("fstat");
1642
} else {
1643
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1644
ret = fchown(pubkey_fd, uid, gid);
1645
if(ret == -1){
1646
perror_plus("fchown");
1647
}
1648
}
1649
}
1650
TEMP_FAILURE_RETRY(close(pubkey_fd));
1651
}
1652
}
1653
1654
/* Lower privileges */
1655
errno = 0;
1656
ret = seteuid(uid);
1657
if(ret == -1){
1658
perror_plus("seteuid");
1659
}
1660
}
1661
1662
/* Find network hooks and run them */
1663
{
1664
struct dirent **direntries;
1665
struct dirent *direntry;
1666
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1667
alphasort);
1668
int devnull = open("/dev/null", O_RDONLY);
1669
for(int i = 0; i < numhooks; i++){
1670
direntry = direntries[0];
1671
char *fullname = NULL;
1672
ret = asprintf(&fullname, "%s/%s", tempdir,
1673
direntry->d_name);
1674
if(ret < 0){
1675
perror_plus("asprintf");
1676
continue;
1677
}
1678
pid_t hook_pid = fork();
1679
if(hook_pid == 0){
1680
/* Child */
1681
dup2(devnull, STDIN_FILENO);
1682
close(devnull);
1683
dup2(STDERR_FILENO, STDOUT_FILENO);
1684
setenv("DEVICE", interface, 1);
1685
setenv("VERBOSE", debug ? "1" : "0", 1);
1686
setenv("MODE", "start", 1);
1687
/* setenv( XXX more here */
1688
ret = execl(fullname, direntry->d_name, "start");
1689
perror_plus("execl");
1690
}
1691
free(fullname);
1692
if(quit_now){
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");
1693
2606
goto end;
1694
2607
}
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1695
2610
}
1696
close(devnull);
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
1697
2613
}
1698
2614
1699
2615
if(not debug){
1700
2616
avahi_set_log_function(empty_log);
1701
2617
}
1702
2618
1703
if(interface[0] == '\0'){
1704
struct dirent **direntries;
1705
ret = scandir(sys_class_net, &direntries, good_interface,
1706
alphasort);
1707
if(ret >= 1){
1708
/* Pick the first good interface */
1709
interface = strdup(direntries[0]->d_name);
1710
if(debug){
1711
fprintf(stderr, "Using interface \"%s\"\n", interface);
1712
}
1713
if(interface == NULL){
1714
perror_plus("malloc");
1715
free(direntries);
1716
exitcode = EXIT_FAILURE;
1717
goto end;
1718
}
1719
free(direntries);
1720
} else {
1721
free(direntries);
1722
fprintf(stderr, "Could not find a network interface\n");
1723
exitcode = EXIT_FAILURE;
1724
goto end;
1725
}
1726
}
1727
1728
2619
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1729
2620
from the signal handler */
1730
2621
/* Initialize the pseudo-RNG for Avahi */
1731
2622
srand((unsigned int) time(NULL));
1732
mc.simple_poll = avahi_simple_poll_new();
1733
if(mc.simple_poll == NULL){
1734
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
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");
1735
2627
exitcode = EX_UNAVAILABLE;
1736
2628
goto end;
1737
2629
}
1799
2691
}
1800
2692
}
1801
2693
1802
/* If the interface is down, bring it up */
1803
if(strcmp(interface, "none") != 0){
1804
if_index = (AvahiIfIndex) if_nametoindex(interface);
1805
if(if_index == 0){
1806
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1807
exitcode = EX_UNAVAILABLE;
1808
goto end;
1809
}
1810
1811
if(quit_now){
1812
goto end;
1813
}
1814
1815
/* Re-raise priviliges */
1816
errno = 0;
1817
ret = seteuid(0);
1818
if(ret == -1){
1819
perror_plus("seteuid");
1820
}
1821
1822
#ifdef __linux__
1823
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1824
messages about the network interface to mess up the prompt */
1825
ret = klogctl(8, NULL, 5);
1826
bool restore_loglevel = true;
1827
if(ret == -1){
1828
restore_loglevel = false;
1829
perror_plus("klogctl");
1830
}
1831
#endif /* __linux__ */
1832
1833
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1834
if(sd < 0){
1835
perror_plus("socket");
1836
exitcode = EX_OSERR;
1837
#ifdef __linux__
1838
if(restore_loglevel){
1839
ret = klogctl(7, NULL, 0);
1840
if(ret == -1){
1841
perror_plus("klogctl");
1842
}
1843
}
1844
#endif /* __linux__ */
1845
/* Lower privileges */
1846
errno = 0;
1847
ret = seteuid(uid);
1848
if(ret == -1){
1849
perror_plus("seteuid");
1850
}
1851
goto end;
1852
}
1853
strcpy(network.ifr_name, interface);
1854
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1855
if(ret == -1){
1856
perror_plus("ioctl SIOCGIFFLAGS");
1857
#ifdef __linux__
1858
if(restore_loglevel){
1859
ret = klogctl(7, NULL, 0);
1860
if(ret == -1){
1861
perror_plus("klogctl");
1862
}
1863
}
1864
#endif /* __linux__ */
1865
exitcode = EX_OSERR;
1866
/* Lower privileges */
1867
errno = 0;
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
1872
goto end;
1873
}
1874
if((network.ifr_flags & IFF_UP) == 0){
1875
network.ifr_flags |= IFF_UP;
1876
take_down_interface = true;
1877
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1878
if(ret == -1){
1879
take_down_interface = false;
1880
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1881
exitcode = EX_OSERR;
1882
#ifdef __linux__
1883
if(restore_loglevel){
1884
ret = klogctl(7, NULL, 0);
1885
if(ret == -1){
1886
perror_plus("klogctl");
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);
2718
} 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;
1887
2745
}
1888
2746
}
1889
#endif /* __linux__ */
1890
/* Lower privileges */
1891
errno = 0;
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
goto end;
1897
}
1898
}
1899
/* Sleep checking until interface is running.
1900
Check every 0.25s, up to total time of delay */
1901
for(int i=0; i < delay * 4; i++){
1902
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1903
if(ret == -1){
1904
perror_plus("ioctl SIOCGIFFLAGS");
1905
} else if(network.ifr_flags & IFF_RUNNING){
1906
2747
break;
1907
2748
}
1908
struct timespec sleeptime = { .tv_nsec = 250000000 };
1909
ret = nanosleep(&sleeptime, NULL);
1910
if(ret == -1 and errno != EINTR){
1911
perror_plus("nanosleep");
1912
}
1913
}
1914
if(not take_down_interface){
1915
/* We won't need the socket anymore */
1916
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1917
if(ret == -1){
1918
perror_plus("close");
1919
}
1920
}
1921
#ifdef __linux__
1922
if(restore_loglevel){
1923
/* Restores kernel loglevel to default */
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
if(take_down_interface){
1933
/* Lower privileges */
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
} else {
1939
/* Lower privileges permanently */
1940
ret = setuid(uid);
1941
if(ret == -1){
1942
perror_plus("setuid");
1943
}
1944
}
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);
1945
2777
}
1946
2778
1947
2779
if(quit_now){
1948
2780
goto end;
1949
2781
}
1950
2782
1951
ret = init_gnutls_global(pubkey, seckey);
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1952
2784
if(ret == -1){
1953
fprintf(stderr, "init_gnutls_global failed\n");
2785
fprintf_plus(stderr, "init_gnutls_global failed\n");
1954
2786
exitcode = EX_UNAVAILABLE;
1955
2787
goto end;
1956
2788
} else {
1961
2793
goto end;
1962
2794
}
1963
2795
1964
if(mkdtemp(tempdir) == NULL){
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){
1965
2806
perror_plus("mkdtemp");
1966
2807
goto end;
1967
2808
}
1968
tempdir_created = true;
1969
2809
1970
2810
if(quit_now){
1971
2811
goto end;
1972
2812
}
1973
2813
1974
if(not init_gpgme(pubkey, seckey, tempdir)){
1975
fprintf(stderr, "init_gpgme failed\n");
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2815
fprintf_plus(stderr, "init_gpgme failed\n");
1976
2816
exitcode = EX_UNAVAILABLE;
1977
2817
goto end;
1978
2818
} else {
1987
2827
/* Connect directly, do not use Zeroconf */
1988
2828
/* (Mainly meant for debugging) */
1989
2829
char *address = strrchr(connect_to, ':');
2830
1990
2831
if(address == NULL){
1991
fprintf(stderr, "No colon in address\n");
2832
fprintf_plus(stderr, "No colon in address\n");
1992
2833
exitcode = EX_USAGE;
1993
2834
goto end;
1994
2835
}
1997
2838
goto end;
1998
2839
}
1999
2840
2000
uint16_t port;
2841
in_port_t port;
2001
2842
errno = 0;
2002
2843
tmpmax = strtoimax(address+1, &tmp, 10);
2003
2844
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2004
or tmpmax != (uint16_t)tmpmax){
2005
fprintf(stderr, "Bad port number\n");
2845
or tmpmax != (in_port_t)tmpmax){
2846
fprintf_plus(stderr, "Bad port number\n");
2006
2847
exitcode = EX_USAGE;
2007
2848
goto end;
2008
2849
}
2009
2850
2010
2851
if(quit_now){
2011
2852
goto end;
2012
2853
}
2013
2854
2014
port = (uint16_t)tmpmax;
2855
port = (in_port_t)tmpmax;
2015
2856
*address = '\0';
2016
2857
/* Colon in address indicates IPv6 */
2017
2858
int af;
2033
2874
}
2034
2875
2035
2876
while(not quit_now){
2036
ret = start_mandos_communication(address, port, if_index, af);
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2037
2879
if(quit_now or ret == 0){
2038
2880
break;
2039
2881
}
2040
2882
if(debug){
2041
fprintf(stderr, "Retrying in %d seconds\n",
2042
(int)retry_interval);
2883
fprintf_plus(stderr, "Retrying in %d seconds\n",
2884
(int)retry_interval);
2043
2885
}
2044
sleep((int)retry_interval);
2886
sleep((unsigned int)retry_interval);
2045
2887
}
2046
2888
2047
if (not quit_now){
2889
if(not quit_now){
2048
2890
exitcode = EXIT_SUCCESS;
2049
2891
}
2050
2892
2065
2907
config.publish_domain = 0;
2066
2908
2067
2909
/* Allocate a new server */
2068
mc.server = avahi_server_new(avahi_simple_poll_get
2069
(mc.simple_poll), &config, NULL,
2070
NULL, &error);
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret_errno);
2071
2912
2072
2913
/* Free the Avahi configuration data */
2073
2914
avahi_server_config_free(&config);
2075
2916
2076
2917
/* Check if creating the Avahi server object succeeded */
2077
2918
if(mc.server == NULL){
2078
fprintf(stderr, "Failed to create Avahi server: %s\n",
2079
avahi_strerror(error));
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2920
avahi_strerror(ret_errno));
2080
2921
exitcode = EX_UNAVAILABLE;
2081
2922
goto end;
2082
2923
}
2088
2929
/* Create the Avahi service browser */
2089
2930
sb = avahi_s_service_browser_new(mc.server, if_index,
2090
2931
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2091
NULL, 0, browse_callback, NULL);
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
2092
2934
if(sb == NULL){
2093
fprintf(stderr, "Failed to create service browser: %s\n",
2094
avahi_strerror(avahi_server_errno(mc.server)));
2935
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2936
avahi_strerror(avahi_server_errno(mc.server)));
2095
2937
exitcode = EX_UNAVAILABLE;
2096
2938
goto end;
2097
2939
}
2103
2945
/* Run the main loop */
2104
2946
2105
2947
if(debug){
2106
fprintf(stderr, "Starting Avahi loop search\n");
2948
fprintf_plus(stderr, "Starting Avahi loop search\n");
2107
2949
}
2108
2109
ret = avahi_loop_with_timeout(mc.simple_poll,
2110
(int)(retry_interval * 1000));
2950
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2111
2953
if(debug){
2112
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2113
(ret == 0) ? "successfully" : "with error");
2954
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2955
(ret == 0) ? "successfully" : "with error");
2114
2956
}
2115
2957
2116
2958
end:
2117
2959
2118
2960
if(debug){
2119
fprintf(stderr, "%s exiting\n", argv[0]);
2961
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2120
2962
}
2121
2963
2122
2964
/* Cleanup things */
2965
free(mc.interfaces);
2966
2123
2967
if(sb != NULL)
2124
2968
avahi_s_service_browser_free(sb);
2125
2969
2126
2970
if(mc.server != NULL)
2127
2971
avahi_server_free(mc.server);
2128
2972
2129
if(mc.simple_poll != NULL)
2130
avahi_simple_poll_free(mc.simple_poll);
2973
if(simple_poll != NULL)
2974
avahi_simple_poll_free(simple_poll);
2131
2975
2132
2976
if(gnutls_initialized){
2133
2977
gnutls_certificate_free_credentials(mc.cred);
2138
2982
if(gpgme_initialized){
2139
2983
gpgme_release(mc.ctx);
2140
2984
}
2141
2985
2142
2986
/* Cleans up the circular linked list of Mandos servers the client
2143
2987
has seen */
2144
2988
if(mc.current_server != NULL){
2145
2989
mc.current_server->prev->next = NULL;
2146
2990
while(mc.current_server != NULL){
2147
2991
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
2148
3000
free(mc.current_server);
2149
3001
mc.current_server = next;
2150
3002
}
2151
3003
}
2152
3004
2153
/* XXX run network hooks "stop" here */
2154
2155
/* Take down the network interface */
2156
if(take_down_interface){
2157
/* Re-raise priviliges */
2158
errno = 0;
2159
ret = seteuid(0);
2160
if(ret == -1){
2161
perror_plus("seteuid");
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
}
2162
3034
}
2163
if(geteuid() == 0){
2164
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2165
if(ret == -1){
2166
perror_plus("ioctl SIOCGIFFLAGS");
2167
} else if(network.ifr_flags & IFF_UP) {
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2170
if(ret == -1){
2171
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2172
}
2173
}
2174
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2175
if(ret == -1){
2176
perror_plus("close");
2177
}
2178
/* Lower privileges permanently */
2179
errno = 0;
2180
ret = setuid(uid);
2181
if(ret == -1){
2182
perror_plus("setuid");
2183
}
3035
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3039
perror_plus("Failed to lower privileges permanently");
2184
3040
}
2185
3041
}
2186
3042
3043
free(interfaces_to_take_down);
3044
free(interfaces_hooks);
3045
2187
3046
/* Removes the GPGME temp directory and all files inside */
2188
if(tempdir_created){
3047
if(tempdir != NULL){
2189
3048
struct dirent **direntries = NULL;
2190
struct dirent *direntry = NULL;
2191
int numentries = scandir(tempdir, &direntries, notdotentries,
2192
alphasort);
2193
if (numentries > 0){
2194
for(int i = 0; i < numentries; i++){
2195
direntry = direntries[i];
2196
char *fullname = NULL;
2197
ret = asprintf(&fullname, "%s/%s", tempdir,
2198
direntry->d_name);
2199
if(ret < 0){
2200
perror_plus("asprintf");
2201
continue;
2202
}
2203
ret = remove(fullname);
2204
if(ret == -1){
2205
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2206
strerror(errno));
2207
}
2208
free(fullname);
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
}
2209
3088
}
2210
}
2211
2212
/* need to clean even if 0 because man page doesn't specify */
2213
free(direntries);
2214
if (numentries == -1){
2215
perror_plus("scandir");
2216
}
2217
ret = rmdir(tempdir);
2218
if(ret == -1 and errno != ENOENT){
2219
perror_plus("rmdir");
3089
close(tempdir_fd);
2220
3090
}
2221
3091
}
2222
3092
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0