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- Committer: Teddy Hogeborn
- Date: 2011-10-05 16:56:06 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 509.
- Revision ID: teddy@recompile.se-20111005165606-4ukrgml2ctg8ky1q
Removed superflous white space.
* Makefile: - '' -
* initramfs-tools-hook: - '' -
* mandos: - '' -
* plugin-runner.xml: - '' -
* Makefile: - '' -
* initramfs-tools-hook: - '' -
* mandos: - '' -
* plugin-runner.xml: - '' -
- files removed:
- debian/mandos-client.examples
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
85
85
raise() */
86
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
88
98
89
#ifdef __linux__
99
90
#include <sys/klog.h> /* klogctl() */
117
108
init_gnutls_session(),
118
109
GNUTLS_* */
119
110
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
122
113
123
114
/* GPGME */
124
115
#include <gpgme.h> /* All GPGME types, constants and
132
123
#define PATHDIR "/conf/conf.d/mandos"
133
124
#define SECKEY "seckey.txt"
134
125
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
126
137
127
bool debug = false;
138
128
static const char mandos_protocol_version[] = "1";
140
130
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
131
static const char sys_class_net[] = "/sys/class/net";
142
132
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
133
147
134
/* Doubly linked list that need to be circularly linked when used */
148
135
typedef struct server{
149
136
const char *ip;
150
in_port_t port;
137
uint16_t port;
151
138
AvahiIfIndex if_index;
152
139
int af;
153
140
struct timespec last_seen;
157
144
158
145
/* Used for passing in values through the Avahi callback functions */
159
146
typedef struct {
147
AvahiSimplePoll *simple_poll;
160
148
AvahiServer *server;
161
149
gnutls_certificate_credentials_t cred;
162
150
unsigned int dh_bits;
164
152
const char *priority;
165
153
gpgme_ctx_t ctx;
166
154
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
155
} mandos_context;
170
156
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
173
162
174
163
sig_atomic_t quit_now = 0;
175
164
int signal_received = 0;
176
165
177
166
/* Function to use when printing errors */
178
167
void perror_plus(const char *print_text){
179
int e = errno;
180
168
fprintf(stderr, "Mandos plugin %s: ",
181
169
program_invocation_short_name);
182
errno = e;
183
170
perror(print_text);
184
171
}
185
172
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
196
173
/*
197
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
175
* bytes. "buffer_capacity" is how much is currently allocated,
199
176
* "buffer_length" is how much is already used.
200
177
*/
201
__attribute__((nonnull, warn_unused_result))
202
178
size_t incbuffer(char **buffer, size_t buffer_length,
203
size_t buffer_capacity){
179
size_t buffer_capacity){
204
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
211
183
return 0;
212
184
}
213
*buffer = new_buf;
214
185
buffer_capacity += BUFFER_SIZE;
215
186
}
216
187
return buffer_capacity;
217
188
}
218
189
219
190
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
223
194
int ret;
224
195
server *new_server = malloc(sizeof(server));
225
196
if(new_server == NULL){
226
197
perror_plus("malloc");
227
return false;
198
return -1;
228
199
}
229
200
*new_server = (server){ .ip = strdup(ip),
230
.port = port,
231
.if_index = if_index,
232
.af = af };
201
.port = port,
202
.if_index = if_index,
203
.af = af };
233
204
if(new_server->ip == NULL){
234
205
perror_plus("strdup");
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
206
return -1;
241
207
}
242
208
/* Special case of first server */
243
if(*current_server == NULL){
209
if (mc.current_server == NULL){
244
210
new_server->next = new_server;
245
211
new_server->prev = new_server;
246
*current_server = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
247
214
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
251
217
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
255
226
}
256
227
257
228
/*
258
229
* Initialize GPGME.
259
230
*/
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char *seckey, const char *pubkey,
262
const char *tempdir, mandos_context *mc){
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
263
233
gpgme_error_t rc;
264
234
gpgme_engine_info_t engine_info;
265
235
236
266
237
/*
267
238
* Helper function to insert pub and seckey to the engine keyring.
268
239
*/
279
250
280
251
rc = gpgme_data_new_from_fd(&pgp_data, fd);
281
252
if(rc != GPG_ERR_NO_ERROR){
282
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
284
255
return false;
285
256
}
286
257
287
rc = gpgme_op_import(mc->ctx, pgp_data);
258
rc = gpgme_op_import(mc.ctx, pgp_data);
288
259
if(rc != GPG_ERR_NO_ERROR){
289
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
291
262
return false;
292
263
}
293
264
300
271
}
301
272
302
273
if(debug){
303
fprintf_plus(stderr, "Initializing GPGME\n");
274
fprintf(stderr, "Initializing GPGME\n");
304
275
}
305
276
306
277
/* Init GPGME */
307
278
gpgme_check_version(NULL);
308
279
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
309
280
if(rc != GPG_ERR_NO_ERROR){
310
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
312
283
return false;
313
284
}
314
285
315
286
/* Set GPGME home directory for the OpenPGP engine only */
316
287
rc = gpgme_get_engine_info(&engine_info);
317
288
if(rc != GPG_ERR_NO_ERROR){
318
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
319
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
320
291
return false;
321
292
}
322
293
while(engine_info != NULL){
328
299
engine_info = engine_info->next;
329
300
}
330
301
if(engine_info == NULL){
331
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
332
tempdir);
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
333
303
return false;
334
304
}
335
305
336
306
/* Create new GPGME "context" */
337
rc = gpgme_new(&(mc->ctx));
307
rc = gpgme_new(&(mc.ctx));
338
308
if(rc != GPG_ERR_NO_ERROR){
339
fprintf_plus(stderr, "Mandos plugin mandos-client: "
340
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
341
gpgme_strerror(rc));
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
342
311
return false;
343
312
}
344
313
353
322
* Decrypt OpenPGP data.
354
323
* Returns -1 on error
355
324
*/
356
__attribute__((nonnull, warn_unused_result))
357
325
static ssize_t pgp_packet_decrypt(const char *cryptotext,
358
326
size_t crypto_size,
359
char **plaintext,
360
mandos_context *mc){
327
char **plaintext){
361
328
gpgme_data_t dh_crypto, dh_plain;
362
329
gpgme_error_t rc;
363
330
ssize_t ret;
365
332
ssize_t plaintext_length = 0;
366
333
367
334
if(debug){
368
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
369
336
}
370
337
371
338
/* Create new GPGME data buffer from memory cryptotext */
372
339
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
373
340
0);
374
341
if(rc != GPG_ERR_NO_ERROR){
375
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
377
344
return -1;
378
345
}
379
346
380
347
/* Create new empty GPGME data buffer for the plaintext */
381
348
rc = gpgme_data_new(&dh_plain);
382
349
if(rc != GPG_ERR_NO_ERROR){
383
fprintf_plus(stderr, "Mandos plugin mandos-client: "
384
"bad gpgme_data_new: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
386
352
gpgme_data_release(dh_crypto);
387
353
return -1;
388
354
}
389
355
390
356
/* Decrypt data from the cryptotext data buffer to the plaintext
391
357
data buffer */
392
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
393
359
if(rc != GPG_ERR_NO_ERROR){
394
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
396
362
plaintext_length = -1;
397
363
if(debug){
398
364
gpgme_decrypt_result_t result;
399
result = gpgme_op_decrypt_result(mc->ctx);
365
result = gpgme_op_decrypt_result(mc.ctx);
400
366
if(result == NULL){
401
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
402
368
} else {
403
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
404
result->unsupported_algorithm);
405
fprintf_plus(stderr, "Wrong key usage: %u\n",
406
result->wrong_key_usage);
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
407
373
if(result->file_name != NULL){
408
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
fprintf(stderr, "File name: %s\n", result->file_name);
409
375
}
410
376
gpgme_recipient_t recipient;
411
377
recipient = result->recipients;
412
378
while(recipient != NULL){
413
fprintf_plus(stderr, "Public key algorithm: %s\n",
414
gpgme_pubkey_algo_name
415
(recipient->pubkey_algo));
416
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
417
fprintf_plus(stderr, "Secret key available: %s\n",
418
recipient->status == GPG_ERR_NO_SECKEY
419
? "No" : "Yes");
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
420
385
recipient = recipient->next;
421
386
}
422
387
}
425
390
}
426
391
427
392
if(debug){
428
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
429
394
}
430
395
431
396
/* Seek back to the beginning of the GPGME plaintext data buffer */
438
403
*plaintext = NULL;
439
404
while(true){
440
405
plaintext_capacity = incbuffer(plaintext,
441
(size_t)plaintext_length,
442
plaintext_capacity);
406
(size_t)plaintext_length,
407
plaintext_capacity);
443
408
if(plaintext_capacity == 0){
444
perror_plus("incbuffer");
445
plaintext_length = -1;
446
goto decrypt_end;
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
447
412
}
448
413
449
414
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
462
427
}
463
428
464
429
if(debug){
465
fprintf_plus(stderr, "Decrypted password is: ");
430
fprintf(stderr, "Decrypted password is: ");
466
431
for(ssize_t i = 0; i < plaintext_length; i++){
467
432
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
468
433
}
479
444
return plaintext_length;
480
445
}
481
446
482
__attribute__((warn_unused_result))
483
static const char *safer_gnutls_strerror(int value){
484
const char *ret = gnutls_strerror(value);
447
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
485
450
if(ret == NULL)
486
451
ret = "(unknown)";
487
452
return ret;
488
453
}
489
454
490
455
/* GnuTLS log function callback */
491
__attribute__((nonnull))
492
456
static void debuggnutls(__attribute__((unused)) int level,
493
457
const char* string){
494
fprintf_plus(stderr, "GnuTLS: %s", string);
458
fprintf(stderr, "GnuTLS: %s", string);
495
459
}
496
460
497
__attribute__((nonnull, warn_unused_result))
498
461
static int init_gnutls_global(const char *pubkeyfilename,
499
const char *seckeyfilename,
500
mandos_context *mc){
462
const char *seckeyfilename){
501
463
int ret;
502
464
503
465
if(debug){
504
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
fprintf(stderr, "Initializing GnuTLS\n");
505
467
}
506
468
507
469
ret = gnutls_global_init();
508
470
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
510
safer_gnutls_strerror(ret));
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
511
473
return -1;
512
474
}
513
475
520
482
}
521
483
522
484
/* OpenPGP credentials */
523
ret = gnutls_certificate_allocate_credentials(&mc->cred);
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
524
486
if(ret != GNUTLS_E_SUCCESS){
525
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
526
safer_gnutls_strerror(ret));
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
527
489
gnutls_global_deinit();
528
490
return -1;
529
491
}
530
492
531
493
if(debug){
532
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
533
" secret key %s as GnuTLS credentials\n",
534
pubkeyfilename,
535
seckeyfilename);
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
536
497
}
537
498
538
499
ret = gnutls_certificate_set_openpgp_key_file
539
(mc->cred, pubkeyfilename, seckeyfilename,
500
(mc.cred, pubkeyfilename, seckeyfilename,
540
501
GNUTLS_OPENPGP_FMT_BASE64);
541
502
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr,
543
"Error[%d] while reading the OpenPGP key pair ('%s',"
544
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
545
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
546
safer_gnutls_strerror(ret));
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
547
508
goto globalfail;
548
509
}
549
510
550
511
/* GnuTLS server initialization */
551
ret = gnutls_dh_params_init(&mc->dh_params);
512
ret = gnutls_dh_params_init(&mc.dh_params);
552
513
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
554
" initialization: %s\n",
555
safer_gnutls_strerror(ret));
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
556
516
goto globalfail;
557
517
}
558
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
559
519
if(ret != GNUTLS_E_SUCCESS){
560
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
561
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
562
522
goto globalfail;
563
523
}
564
524
565
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
566
526
567
527
return 0;
568
528
569
529
globalfail:
570
530
571
gnutls_certificate_free_credentials(mc->cred);
531
gnutls_certificate_free_credentials(mc.cred);
572
532
gnutls_global_deinit();
573
gnutls_dh_params_deinit(mc->dh_params);
533
gnutls_dh_params_deinit(mc.dh_params);
574
534
return -1;
575
535
}
576
536
577
__attribute__((nonnull, warn_unused_result))
578
static int init_gnutls_session(gnutls_session_t *session,
579
mandos_context *mc){
537
static int init_gnutls_session(gnutls_session_t *session){
580
538
int ret;
581
539
/* GnuTLS session creation */
582
540
do {
586
544
}
587
545
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
588
546
if(ret != GNUTLS_E_SUCCESS){
589
fprintf_plus(stderr,
590
"Error in GnuTLS session initialization: %s\n",
591
safer_gnutls_strerror(ret));
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
592
549
}
593
550
594
551
{
595
552
const char *err;
596
553
do {
597
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
598
555
if(quit_now){
599
556
gnutls_deinit(*session);
600
557
return -1;
601
558
}
602
559
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
603
560
if(ret != GNUTLS_E_SUCCESS){
604
fprintf_plus(stderr, "Syntax error at: %s\n", err);
605
fprintf_plus(stderr, "GnuTLS error: %s\n",
606
safer_gnutls_strerror(ret));
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
607
564
gnutls_deinit(*session);
608
565
return -1;
609
566
}
611
568
612
569
do {
613
570
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
614
mc->cred);
571
mc.cred);
615
572
if(quit_now){
616
573
gnutls_deinit(*session);
617
574
return -1;
618
575
}
619
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
620
577
if(ret != GNUTLS_E_SUCCESS){
621
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
622
safer_gnutls_strerror(ret));
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
623
580
gnutls_deinit(*session);
624
581
return -1;
625
582
}
627
584
/* ignore client certificate if any. */
628
585
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
629
586
630
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
631
588
632
589
return 0;
633
590
}
637
594
__attribute__((unused)) const char *txt){}
638
595
639
596
/* Called when a Mandos server is found */
640
__attribute__((nonnull, warn_unused_result))
641
static int start_mandos_communication(const char *ip, in_port_t port,
597
static int start_mandos_communication(const char *ip, uint16_t port,
642
598
AvahiIfIndex if_index,
643
int af, mandos_context *mc){
599
int af){
644
600
int ret, tcp_sd = -1;
645
601
ssize_t sret;
646
struct sockaddr_storage to;
602
union {
603
struct sockaddr_in in;
604
struct sockaddr_in6 in6;
605
} to;
647
606
char *buffer = NULL;
648
607
char *decrypted_buffer = NULL;
649
608
size_t buffer_length = 0;
668
627
pf = PF_INET;
669
628
break;
670
629
default:
671
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
fprintf(stderr, "Bad address family: %d\n", af);
672
631
errno = EINVAL;
673
632
return -1;
674
633
}
675
634
676
/* If the interface is specified and we have a list of interfaces */
677
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
678
/* Check if the interface is one of the interfaces we are using */
679
bool match = false;
680
{
681
char *interface = NULL;
682
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
683
interface))){
684
if(if_nametoindex(interface) == (unsigned int)if_index){
685
match = true;
686
break;
687
}
688
}
689
}
690
if(not match){
691
/* This interface does not match any in the list, so we don't
692
connect to the server */
693
if(debug){
694
char interface[IF_NAMESIZE];
695
if(if_indextoname((unsigned int)if_index, interface) == NULL){
696
perror_plus("if_indextoname");
697
} else {
698
fprintf_plus(stderr, "Skipping server on non-used interface"
699
" \"%s\"\n",
700
if_indextoname((unsigned int)if_index,
701
interface));
702
}
703
}
704
return -1;
705
}
706
}
707
708
ret = init_gnutls_session(&session, mc);
635
ret = init_gnutls_session(&session);
709
636
if(ret != 0){
710
637
return -1;
711
638
}
712
639
713
640
if(debug){
714
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
715
PRIuMAX "\n", ip, (uintmax_t)port);
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
716
643
}
717
644
718
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
730
657
731
658
memset(&to, 0, sizeof(to));
732
659
if(af == AF_INET6){
733
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
734
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
660
to.in6.sin6_family = (sa_family_t)af;
661
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
662
} else { /* IPv4 */
736
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
663
to.in.sin_family = (sa_family_t)af;
664
ret = inet_pton(af, ip, &to.in.sin_addr);
738
665
}
739
666
if(ret < 0 ){
740
667
int e = errno;
744
671
}
745
672
if(ret == 0){
746
673
int e = errno;
747
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
fprintf(stderr, "Bad address: %s\n", ip);
748
675
errno = e;
749
676
goto mandos_end;
750
677
}
751
678
if(af == AF_INET6){
752
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
753
if(IN6_IS_ADDR_LINKLOCAL
754
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
755
686
if(if_index == AVAHI_IF_UNSPEC){
756
fprintf_plus(stderr, "An IPv6 link-local address is"
757
" incomplete without a network interface\n");
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
758
689
errno = EINVAL;
759
690
goto mandos_end;
760
691
}
761
692
/* Set the network interface number as scope */
762
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
693
to.in6.sin6_scope_id = (uint32_t)if_index;
763
694
}
764
695
} else {
765
((struct sockaddr_in *)&to)->sin_port = htons(port);
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
766
699
}
767
700
768
701
if(quit_now){
776
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
777
710
perror_plus("if_indextoname");
778
711
} else {
779
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
780
"\n", ip, interface, (uintmax_t)port);
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
781
714
}
782
715
} else {
783
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
784
ip, (uintmax_t)port);
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
785
718
}
786
719
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
787
720
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
721
const char *pcret;
788
722
if(af == AF_INET6){
789
ret = getnameinfo((struct sockaddr *)&to,
790
sizeof(struct sockaddr_in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
724
sizeof(addrstr));
793
725
} else {
794
ret = getnameinfo((struct sockaddr *)&to,
795
sizeof(struct sockaddr_in),
796
addrstr, sizeof(addrstr), NULL, 0,
797
NI_NUMERICHOST);
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
727
sizeof(addrstr));
798
728
}
799
if(ret == EAI_SYSTEM){
800
perror_plus("getnameinfo");
801
} else if(ret != 0) {
802
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
803
} else if(strcmp(addrstr, ip) != 0){
804
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
729
if(pcret == NULL){
730
perror_plus("inet_ntop");
731
} else {
732
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
734
}
805
735
}
806
736
}
807
737
811
741
}
812
742
813
743
if(af == AF_INET6){
814
ret = connect(tcp_sd, (struct sockaddr *)&to,
815
sizeof(struct sockaddr_in6));
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
745
} else {
817
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
818
sizeof(struct sockaddr_in));
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
747
}
820
748
if(ret < 0){
821
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
822
750
int e = errno;
823
751
perror_plus("connect");
824
752
errno = e;
836
764
while(true){
837
765
size_t out_size = strlen(out);
838
766
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
839
out_size - written));
767
out_size - written));
840
768
if(ret == -1){
841
769
int e = errno;
842
770
perror_plus("write");
862
790
}
863
791
864
792
if(debug){
865
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
866
794
}
867
795
868
796
if(quit_now){
870
798
goto mandos_end;
871
799
}
872
800
873
/* This casting via intptr_t is to eliminate warning about casting
874
an int to a pointer type. This is exactly how the GnuTLS Guile
875
function "set-session-transport-fd!" does it. */
876
gnutls_transport_set_ptr(session,
877
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
878
803
879
804
if(quit_now){
880
805
errno = EINTR;
891
816
892
817
if(ret != GNUTLS_E_SUCCESS){
893
818
if(debug){
894
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
895
820
gnutls_perror(ret);
896
821
}
897
822
errno = EPROTO;
901
826
/* Read OpenPGP packet that contains the wanted password */
902
827
903
828
if(debug){
904
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
905
" %s\n", ip);
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
906
831
}
907
832
908
833
while(true){
913
838
}
914
839
915
840
buffer_capacity = incbuffer(&buffer, buffer_length,
916
buffer_capacity);
841
buffer_capacity);
917
842
if(buffer_capacity == 0){
918
843
int e = errno;
919
844
perror_plus("incbuffer");
946
871
}
947
872
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
948
873
if(ret < 0){
949
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
950
"***\n");
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
951
875
gnutls_perror(ret);
952
876
errno = EPROTO;
953
877
goto mandos_end;
954
878
}
955
879
break;
956
880
default:
957
fprintf_plus(stderr, "Unknown error while reading data from"
958
" encrypted session with Mandos server\n");
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
959
883
gnutls_bye(session, GNUTLS_SHUT_RDWR);
960
884
errno = EIO;
961
885
goto mandos_end;
966
890
}
967
891
968
892
if(debug){
969
fprintf_plus(stderr, "Closing TLS session\n");
893
fprintf(stderr, "Closing TLS session\n");
970
894
}
971
895
972
896
if(quit_now){
984
908
985
909
if(buffer_length > 0){
986
910
ssize_t decrypted_buffer_size;
987
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
988
&decrypted_buffer, mc);
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
913
&decrypted_buffer);
989
914
if(decrypted_buffer_size >= 0){
990
915
991
916
written = 0;
1001
926
if(ret == 0 and ferror(stdout)){
1002
927
int e = errno;
1003
928
if(debug){
1004
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1005
strerror(errno));
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
1006
931
}
1007
932
errno = e;
1008
933
goto mandos_end;
1039
964
return retval;
1040
965
}
1041
966
1042
__attribute__((nonnull))
1043
967
static void resolve_callback(AvahiSServiceResolver *r,
1044
968
AvahiIfIndex interface,
1045
969
AvahiProtocol proto,
1053
977
AVAHI_GCC_UNUSED AvahiStringList *txt,
1054
978
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
979
flags,
1056
void *mc){
1057
if(r == NULL){
1058
return;
1059
}
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
1060
982
1061
983
/* Called whenever a service has been resolved successfully or
1062
984
timed out */
1068
990
switch(event){
1069
991
default:
1070
992
case AVAHI_RESOLVER_FAILURE:
1071
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1072
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1073
domain,
1074
avahi_strerror(avahi_server_errno
1075
(((mandos_context*)mc)->server)));
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
1076
996
break;
1077
997
1078
998
case AVAHI_RESOLVER_FOUND:
1080
1000
char ip[AVAHI_ADDRESS_STR_MAX];
1081
1001
avahi_address_snprint(ip, sizeof(ip), address);
1082
1002
if(debug){
1083
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1084
PRIdMAX ") on port %" PRIu16 "\n", name,
1085
host_name, ip, (intmax_t)interface, port);
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
1086
1006
}
1087
int ret = start_mandos_communication(ip, (in_port_t)port,
1088
interface,
1089
avahi_proto_to_af(proto),
1090
mc);
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1091
1009
if(ret == 0){
1092
avahi_simple_poll_quit(simple_poll);
1010
avahi_simple_poll_quit(mc.simple_poll);
1093
1011
} else {
1094
if(not add_server(ip, (in_port_t)port, interface,
1095
avahi_proto_to_af(proto),
1096
&((mandos_context*)mc)->current_server)){
1097
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1098
" list\n", name);
1099
}
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1100
1014
}
1101
1015
}
1102
1016
}
1112
1026
const char *domain,
1113
1027
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1114
1028
flags,
1115
void *mc){
1116
if(b == NULL){
1117
return;
1118
}
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
1119
1031
1120
1032
/* Called whenever a new services becomes available on the LAN or
1121
1033
is removed from the LAN */
1128
1040
default:
1129
1041
case AVAHI_BROWSER_FAILURE:
1130
1042
1131
fprintf_plus(stderr, "(Avahi browser) %s\n",
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1134
avahi_simple_poll_quit(simple_poll);
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
1135
1046
return;
1136
1047
1137
1048
case AVAHI_BROWSER_NEW:
1140
1051
the callback function is called the Avahi server will free the
1141
1052
resolver for us. */
1142
1053
1143
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1144
interface, protocol, name, type,
1145
domain, protocol, 0,
1146
resolve_callback, mc) == NULL)
1147
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1148
" %s\n", name,
1149
avahi_strerror(avahi_server_errno
1150
(((mandos_context*)mc)->server)));
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1151
1059
break;
1152
1060
1153
1061
case AVAHI_BROWSER_REMOVE:
1156
1064
case AVAHI_BROWSER_ALL_FOR_NOW:
1157
1065
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1158
1066
if(debug){
1159
fprintf_plus(stderr, "No Mandos server found, still"
1160
" searching...\n");
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1161
1068
}
1162
1069
break;
1163
1070
}
1172
1079
signal_received = sig;
1173
1080
int old_errno = errno;
1174
1081
/* set main loop to exit */
1175
if(simple_poll != NULL){
1176
avahi_simple_poll_quit(simple_poll);
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1177
1084
}
1178
1085
errno = old_errno;
1179
1086
}
1180
1087
1181
__attribute__((nonnull, warn_unused_result))
1182
bool get_flags(const char *ifname, struct ifreq *ifr){
1183
int ret;
1184
error_t ret_errno;
1185
1186
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1187
if(s < 0){
1188
ret_errno = errno;
1189
perror_plus("socket");
1190
errno = ret_errno;
1191
return false;
1192
}
1193
strcpy(ifr->ifr_name, ifname);
1194
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1195
if(ret == -1){
1088
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1196
1144
if(debug){
1197
ret_errno = errno;
1198
perror_plus("ioctl SIOCGIFFLAGS");
1199
errno = ret_errno;
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1200
1147
}
1201
return false;
1148
free(flagstring);
1149
return 0;
1202
1150
}
1203
return true;
1204
}
1205
1206
__attribute__((nonnull, warn_unused_result))
1207
bool good_flags(const char *ifname, const struct ifreq *ifr){
1208
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1209
1153
/* Reject the loopback device */
1210
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(flags & IFF_LOOPBACK){
1211
1155
if(debug){
1212
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1213
ifname);
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1214
1158
}
1215
return false;
1159
return 0;
1216
1160
}
1217
1161
/* Accept point-to-point devices only if connect_to is specified */
1218
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1219
1163
if(debug){
1220
fprintf_plus(stderr, "Accepting point-to-point interface"
1221
" \"%s\"\n", ifname);
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1222
1166
}
1223
return true;
1167
return 1;
1224
1168
}
1225
1169
/* Otherwise, reject non-broadcast-capable devices */
1226
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(not (flags & IFF_BROADCAST)){
1227
1171
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1229
" \"%s\"\n", ifname);
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1230
1174
}
1231
return false;
1175
return 0;
1232
1176
}
1233
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1234
if(ifr->ifr_flags & IFF_NOARP){
1178
if(flags & IFF_NOARP){
1235
1179
if(debug){
1236
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1237
ifname);
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1238
1182
}
1239
return false;
1183
return 0;
1240
1184
}
1241
1242
1185
/* Accept this device */
1243
1186
if(debug){
1244
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1245
}
1246
return true;
1247
}
1248
1249
/*
1250
* This function determines if a directory entry in /sys/class/net
1251
* corresponds to an acceptable network device.
1252
* (This function is passed to scandir(3) as a filter function.)
1253
*/
1254
__attribute__((nonnull, warn_unused_result))
1255
int good_interface(const struct dirent *if_entry){
1256
if(if_entry->d_name[0] == '.'){
1257
return 0;
1258
}
1259
1260
struct ifreq ifr;
1261
if(not get_flags(if_entry->d_name, &ifr)){
1262
if(debug){
1263
fprintf_plus(stderr, "Failed to get flags for interface "
1264
"\"%s\"\n", if_entry->d_name);
1265
}
1266
return 0;
1267
}
1268
1269
if(not good_flags(if_entry->d_name, &ifr)){
1270
return 0;
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1271
1189
}
1272
1190
return 1;
1273
1191
}
1274
1192
1275
/*
1276
* This function determines if a network interface is up.
1277
*/
1278
__attribute__((nonnull, warn_unused_result))
1279
bool interface_is_up(const char *interface){
1280
struct ifreq ifr;
1281
if(not get_flags(interface, &ifr)){
1282
if(debug){
1283
fprintf_plus(stderr, "Failed to get flags for interface "
1284
"\"%s\"\n", interface);
1285
}
1286
return false;
1287
}
1288
1289
return (bool)(ifr.ifr_flags & IFF_UP);
1290
}
1291
1292
/*
1293
* This function determines if a network interface is running
1294
*/
1295
__attribute__((nonnull, warn_unused_result))
1296
bool interface_is_running(const char *interface){
1297
struct ifreq ifr;
1298
if(not get_flags(interface, &ifr)){
1299
if(debug){
1300
fprintf_plus(stderr, "Failed to get flags for interface "
1301
"\"%s\"\n", interface);
1302
}
1303
return false;
1304
}
1305
1306
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1307
}
1308
1309
__attribute__((nonnull, pure, warn_unused_result))
1310
1193
int notdotentries(const struct dirent *direntry){
1311
1194
/* Skip "." and ".." */
1312
1195
if(direntry->d_name[0] == '.'
1318
1201
return 1;
1319
1202
}
1320
1203
1321
/* Is this directory entry a runnable program? */
1322
__attribute__((nonnull, warn_unused_result))
1323
int runnable_hook(const struct dirent *direntry){
1324
int ret;
1325
size_t sret;
1326
struct stat st;
1327
1328
if((direntry->d_name)[0] == '\0'){
1329
/* Empty name? */
1330
return 0;
1331
}
1332
1333
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1334
"abcdefghijklmnopqrstuvwxyz"
1335
"0123456789"
1336
"_-");
1337
if((direntry->d_name)[sret] != '\0'){
1338
/* Contains non-allowed characters */
1339
if(debug){
1340
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1341
direntry->d_name);
1342
}
1343
return 0;
1344
}
1345
1346
char *fullname = NULL;
1347
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1348
if(ret < 0){
1349
perror_plus("asprintf");
1350
return 0;
1351
}
1352
1353
ret = stat(fullname, &st);
1354
if(ret == -1){
1355
if(debug){
1356
perror_plus("Could not stat hook");
1357
}
1358
return 0;
1359
}
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1362
if(debug){
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
direntry->d_name);
1365
}
1366
return 0;
1367
}
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1379
}
1380
return 1;
1381
}
1382
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1386
1205
int ret;
1387
1206
struct timespec now;
1388
1207
struct timespec waited_time;
1389
1208
intmax_t block_time;
1390
1209
1391
1210
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1394
fprintf_plus(stderr, "Wait until first server is found."
1395
" No timeout!\n");
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1396
1215
}
1397
1216
ret = avahi_simple_poll_iterate(s, -1);
1398
1217
} else {
1399
if(debug){
1400
fprintf_plus(stderr, "Check current_server if we should run"
1401
" it, or wait\n");
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1402
1221
}
1403
1222
/* the current time */
1404
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1409
1228
/* Calculating in ms how long time between now and server
1410
1229
who we visted longest time ago. Now - last seen. */
1411
1230
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1231
- mc.current_server->last_seen.tv_sec);
1413
1232
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1233
- mc.current_server->last_seen.tv_nsec);
1415
1234
/* total time is 10s/10,000ms.
1416
1235
Converting to s from ms by dividing by 1,000,
1417
1236
and ns to ms by dividing by 1,000,000. */
1419
1238
- ((intmax_t)waited_time.tv_sec * 1000))
1420
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1240
1422
if(debug){
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
block_time);
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1425
1243
}
1426
1244
1427
1245
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1432
1250
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1251
avahi_simple_poll_quit(mc.simple_poll);
1434
1252
return 0;
1435
1253
}
1436
1254
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1255
&mc.current_server->last_seen);
1438
1256
if(ret == -1){
1439
1257
perror_plus("clock_gettime");
1440
1258
return -1;
1441
1259
}
1442
mc->current_server = mc->current_server->next;
1260
mc.current_server = mc.current_server->next;
1443
1261
block_time = 0; /* Call avahi to find new Mandos
1444
1262
servers, but don't block */
1445
1263
}
1447
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
1266
}
1449
1267
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1268
if (ret > 0 or errno != EINTR) {
1451
1269
return (ret != 1) ? ret : 0;
1452
1270
}
1453
1271
}
1454
1272
}
1455
1273
}
1456
1274
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
perror_plus("seteuid");
1465
}
1466
errno = old_errno;
1467
return ret_errno;
1468
}
1469
1470
/* Set effective and real user ID to 0. Return errno. */
1471
__attribute__((warn_unused_result))
1472
error_t raise_privileges_permanently(void){
1473
error_t old_errno = errno;
1474
error_t ret_errno = raise_privileges();
1475
if(ret_errno != 0){
1476
errno = old_errno;
1477
return ret_errno;
1478
}
1479
if(setuid(0) == -1){
1480
ret_errno = errno;
1481
perror_plus("seteuid");
1482
}
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
1487
/* Set effective user ID to unprivileged saved user ID */
1488
__attribute__((warn_unused_result))
1489
error_t lower_privileges(void){
1490
error_t old_errno = errno;
1491
error_t ret_errno = 0;
1492
if(seteuid(uid) == -1){
1493
ret_errno = errno;
1494
perror_plus("seteuid");
1495
}
1496
errno = old_errno;
1497
return ret_errno;
1498
}
1499
1500
/* Lower privileges permanently */
1501
__attribute__((warn_unused_result))
1502
error_t lower_privileges_permanently(void){
1503
error_t old_errno = errno;
1504
error_t ret_errno = 0;
1505
if(setuid(uid) == -1){
1506
ret_errno = errno;
1507
perror_plus("setuid");
1508
}
1509
errno = old_errno;
1510
return ret_errno;
1511
}
1512
1513
__attribute__((nonnull))
1514
void run_network_hooks(const char *mode, const char *interface,
1515
const float delay){
1516
struct dirent **direntries;
1517
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1518
alphasort);
1519
if(numhooks == -1){
1520
if(errno == ENOENT){
1521
if(debug){
1522
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1523
" found\n", hookdir);
1524
}
1525
} else {
1526
perror_plus("scandir");
1527
}
1528
} else {
1529
struct dirent *direntry;
1530
int ret;
1531
int devnull = open("/dev/null", O_RDONLY);
1532
for(int i = 0; i < numhooks; i++){
1533
direntry = direntries[i];
1534
char *fullname = NULL;
1535
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1536
if(ret < 0){
1537
perror_plus("asprintf");
1538
continue;
1539
}
1540
if(debug){
1541
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1542
direntry->d_name);
1543
}
1544
pid_t hook_pid = fork();
1545
if(hook_pid == 0){
1546
/* Child */
1547
/* Raise privileges */
1548
if(raise_privileges_permanently() != 0){
1549
perror_plus("Failed to raise privileges");
1550
_exit(EX_NOPERM);
1551
}
1552
/* Set group */
1553
errno = 0;
1554
ret = setgid(0);
1555
if(ret == -1){
1556
perror_plus("setgid");
1557
_exit(EX_NOPERM);
1558
}
1559
/* Reset supplementary groups */
1560
errno = 0;
1561
ret = setgroups(0, NULL);
1562
if(ret == -1){
1563
perror_plus("setgroups");
1564
_exit(EX_NOPERM);
1565
}
1566
ret = dup2(devnull, STDIN_FILENO);
1567
if(ret == -1){
1568
perror_plus("dup2(devnull, STDIN_FILENO)");
1569
_exit(EX_OSERR);
1570
}
1571
ret = close(devnull);
1572
if(ret == -1){
1573
perror_plus("close");
1574
_exit(EX_OSERR);
1575
}
1576
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1577
if(ret == -1){
1578
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1579
_exit(EX_OSERR);
1580
}
1581
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
ret = setenv("DEVICE", interface, 1);
1587
if(ret == -1){
1588
perror_plus("setenv");
1589
_exit(EX_OSERR);
1590
}
1591
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1592
if(ret == -1){
1593
perror_plus("setenv");
1594
_exit(EX_OSERR);
1595
}
1596
ret = setenv("MODE", mode, 1);
1597
if(ret == -1){
1598
perror_plus("setenv");
1599
_exit(EX_OSERR);
1600
}
1601
char *delaystring;
1602
ret = asprintf(&delaystring, "%f", (double)delay);
1603
if(ret == -1){
1604
perror_plus("asprintf");
1605
_exit(EX_OSERR);
1606
}
1607
ret = setenv("DELAY", delaystring, 1);
1608
if(ret == -1){
1609
free(delaystring);
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
free(delaystring);
1614
if(connect_to != NULL){
1615
ret = setenv("CONNECT", connect_to, 1);
1616
if(ret == -1){
1617
perror_plus("setenv");
1618
_exit(EX_OSERR);
1619
}
1620
}
1621
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1622
perror_plus("execl");
1623
_exit(EXIT_FAILURE);
1624
}
1625
} else {
1626
int status;
1627
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1628
perror_plus("waitpid");
1629
free(fullname);
1630
continue;
1631
}
1632
if(WIFEXITED(status)){
1633
if(WEXITSTATUS(status) != 0){
1634
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1635
" with status %d\n", direntry->d_name,
1636
WEXITSTATUS(status));
1637
free(fullname);
1638
continue;
1639
}
1640
} else if(WIFSIGNALED(status)){
1641
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1642
" signal %d\n", direntry->d_name,
1643
WTERMSIG(status));
1644
free(fullname);
1645
continue;
1646
} else {
1647
fprintf_plus(stderr, "Warning: network hook \"%s\""
1648
" crashed\n", direntry->d_name);
1649
free(fullname);
1650
continue;
1651
}
1652
}
1653
free(fullname);
1654
if(debug){
1655
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1656
direntry->d_name);
1657
}
1658
}
1659
close(devnull);
1660
}
1661
}
1662
1663
__attribute__((nonnull, warn_unused_result))
1664
error_t bring_up_interface(const char *const interface,
1665
const float delay){
1666
error_t old_errno = errno;
1667
int ret;
1668
struct ifreq network;
1669
unsigned int if_index = if_nametoindex(interface);
1670
if(if_index == 0){
1671
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1672
errno = old_errno;
1673
return ENXIO;
1674
}
1675
1676
if(quit_now){
1677
errno = old_errno;
1678
return EINTR;
1679
}
1680
1681
if(not interface_is_up(interface)){
1682
error_t ret_errno = 0, ioctl_errno = 0;
1683
if(not get_flags(interface, &network)){
1684
ret_errno = errno;
1685
fprintf_plus(stderr, "Failed to get flags for interface "
1686
"\"%s\"\n", interface);
1687
errno = old_errno;
1688
return ret_errno;
1689
}
1690
network.ifr_flags |= IFF_UP; /* set flag */
1691
1692
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1693
if(sd == -1){
1694
ret_errno = errno;
1695
perror_plus("socket");
1696
errno = old_errno;
1697
return ret_errno;
1698
}
1699
1700
if(quit_now){
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
errno = old_errno;
1706
return EINTR;
1707
}
1708
1709
if(debug){
1710
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1711
interface);
1712
}
1713
1714
/* Raise privileges */
1715
ret_errno = raise_privileges();
1716
bool restore_loglevel = false;
1717
if(ret_errno != 0){
1718
perror_plus("Failed to raise privileges");
1719
}
1720
#ifdef __linux__
1721
int ret_linux;
1722
if(ret_errno == 0){
1723
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1724
messages about the network interface to mess up the prompt */
1725
ret_linux = klogctl(8, NULL, 5);
1726
if(ret_linux == -1){
1727
perror_plus("klogctl");
1728
} else {
1729
restore_loglevel = true;
1730
}
1731
}
1732
#endif /* __linux__ */
1733
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1734
ioctl_errno = errno;
1735
#ifdef __linux__
1736
if(restore_loglevel){
1737
ret_linux = klogctl(7, NULL, 0);
1738
if(ret_linux == -1){
1739
perror_plus("klogctl");
1740
}
1741
}
1742
#endif /* __linux__ */
1743
1744
/* If raise_privileges() succeeded above */
1745
if(ret_errno == 0){
1746
/* Lower privileges */
1747
ret_errno = lower_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to lower privileges");
1751
}
1752
}
1753
1754
/* Close the socket */
1755
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1756
if(ret == -1){
1757
perror_plus("close");
1758
}
1759
1760
if(ret_setflags == -1){
1761
errno = ioctl_errno;
1762
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1763
errno = old_errno;
1764
return ioctl_errno;
1765
}
1766
} else if(debug){
1767
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1768
interface);
1769
}
1770
1771
/* Sleep checking until interface is running.
1772
Check every 0.25s, up to total time of delay */
1773
for(int i=0; i < delay * 4; i++){
1774
if(interface_is_running(interface)){
1775
break;
1776
}
1777
struct timespec sleeptime = { .tv_nsec = 250000000 };
1778
ret = nanosleep(&sleeptime, NULL);
1779
if(ret == -1 and errno != EINTR){
1780
perror_plus("nanosleep");
1781
}
1782
}
1783
1784
errno = old_errno;
1785
return 0;
1786
}
1787
1788
__attribute__((nonnull, warn_unused_result))
1789
error_t take_down_interface(const char *const interface){
1790
error_t old_errno = errno;
1791
struct ifreq network;
1792
unsigned int if_index = if_nametoindex(interface);
1793
if(if_index == 0){
1794
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1795
errno = old_errno;
1796
return ENXIO;
1797
}
1798
if(interface_is_up(interface)){
1799
error_t ret_errno = 0, ioctl_errno = 0;
1800
if(not get_flags(interface, &network) and debug){
1801
ret_errno = errno;
1802
fprintf_plus(stderr, "Failed to get flags for interface "
1803
"\"%s\"\n", interface);
1804
errno = old_errno;
1805
return ret_errno;
1806
}
1807
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1808
1809
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
if(sd == -1){
1811
ret_errno = errno;
1812
perror_plus("socket");
1813
errno = old_errno;
1814
return ret_errno;
1815
}
1816
1817
if(debug){
1818
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1819
interface);
1820
}
1821
1822
/* Raise privileges */
1823
ret_errno = raise_privileges();
1824
if(ret_errno != 0){
1825
perror_plus("Failed to raise privileges");
1826
}
1827
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1828
ioctl_errno = errno;
1829
1830
/* If raise_privileges() succeeded above */
1831
if(ret_errno == 0){
1832
/* Lower privileges */
1833
ret_errno = lower_privileges();
1834
if(ret_errno != 0){
1835
errno = ret_errno;
1836
perror_plus("Failed to lower privileges");
1837
}
1838
}
1839
1840
/* Close the socket */
1841
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1842
if(ret == -1){
1843
perror_plus("close");
1844
}
1845
1846
if(ret_setflags == -1){
1847
errno = ioctl_errno;
1848
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1849
errno = old_errno;
1850
return ioctl_errno;
1851
}
1852
} else if(debug){
1853
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1854
interface);
1855
}
1856
1857
errno = old_errno;
1858
return 0;
1859
}
1860
1861
1275
int main(int argc, char *argv[]){
1862
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1863
.priority = "SECURE256:!CTYPE-X.509:"
1864
"+CTYPE-OPENPGP", .current_server = NULL,
1865
.interfaces = NULL, .interfaces_size = 0 };
1866
1276
AvahiSServiceBrowser *sb = NULL;
1867
error_t ret_errno;
1277
int error;
1868
1278
int ret;
1869
1279
intmax_t tmpmax;
1870
1280
char *tmp;
1871
1281
int exitcode = EXIT_SUCCESS;
1872
char *interfaces_to_take_down = NULL;
1873
size_t interfaces_to_take_down_size = 0;
1282
const char *interface = "";
1283
struct ifreq network;
1284
int sd = -1;
1285
bool take_down_interface = false;
1286
uid_t uid;
1287
gid_t gid;
1874
1288
char tempdir[] = "/tmp/mandosXXXXXX";
1875
1289
bool tempdir_created = false;
1876
1290
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1877
1291
const char *seckey = PATHDIR "/" SECKEY;
1878
1292
const char *pubkey = PATHDIR "/" PUBKEY;
1879
char *interfaces_hooks = NULL;
1880
1293
1881
1294
bool gnutls_initialized = false;
1882
1295
bool gpgme_initialized = false;
1944
1357
.group = 2 },
1945
1358
{ .name = "retry", .key = 132,
1946
1359
.arg = "SECONDS",
1947
.doc = "Retry interval used when denied by the Mandos server",
1948
.group = 2 },
1949
{ .name = "network-hook-dir", .key = 133,
1950
.arg = "DIR",
1951
.doc = "Directory where network hooks are located",
1360
.doc = "Retry interval used when denied by the mandos server",
1952
1361
.group = 2 },
1953
1362
/*
1954
1363
* These reproduce what we would get without ARGP_NO_HELP
1973
1382
connect_to = arg;
1974
1383
break;
1975
1384
case 'i': /* --interface */
1976
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1977
arg, (int)',');
1978
if(ret_errno != 0){
1979
argp_error(state, "%s", strerror(ret_errno));
1980
}
1385
interface = arg;
1981
1386
break;
1982
1387
case 's': /* --seckey */
1983
1388
seckey = arg;
2012
1417
argp_error(state, "Bad retry interval");
2013
1418
}
2014
1419
break;
2015
case 133: /* --network-hook-dir */
2016
hookdir = arg;
2017
break;
2018
1420
/*
2019
1421
* These reproduce what we would get without ARGP_NO_HELP
2020
1422
*/
2026
1428
argp_state_help(state, state->out_stream,
2027
1429
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2028
1430
case 'V': /* --version */
2029
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
2030
1432
exit(argp_err_exit_status);
2031
1433
break;
2032
1434
default:
2059
1461
{
2060
1462
/* Work around Debian bug #633582:
2061
1463
<http://bugs.debian.org/633582> */
2062
2063
/* Re-raise privileges */
2064
ret_errno = raise_privileges();
2065
if(ret_errno != 0){
2066
errno = ret_errno;
2067
perror_plus("Failed to raise privileges");
2068
} else {
2069
struct stat st;
2070
2071
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2072
int seckey_fd = open(seckey, O_RDONLY);
2073
if(seckey_fd == -1){
2074
perror_plus("open");
2075
} else {
2076
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2077
if(ret == -1){
2078
perror_plus("fstat");
2079
} else {
2080
if(S_ISREG(st.st_mode)
2081
and st.st_uid == 0 and st.st_gid == 0){
2082
ret = fchown(seckey_fd, uid, gid);
2083
if(ret == -1){
2084
perror_plus("fchown");
2085
}
2086
}
2087
}
2088
TEMP_FAILURE_RETRY(close(seckey_fd));
2089
}
2090
}
2091
2092
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2093
int pubkey_fd = open(pubkey, O_RDONLY);
2094
if(pubkey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2098
if(ret == -1){
2099
perror_plus("fstat");
2100
} else {
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(pubkey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(pubkey_fd));
2110
}
2111
}
2112
2113
/* Lower privileges */
2114
ret_errno = lower_privileges();
2115
if(ret_errno != 0){
2116
errno = ret_errno;
2117
perror_plus("Failed to lower privileges");
2118
}
2119
}
2120
}
2121
2122
/* Remove invalid interface names (except "none") */
2123
{
2124
char *interface = NULL;
2125
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2126
interface))){
2127
if(strcmp(interface, "none") != 0
2128
and if_nametoindex(interface) == 0){
2129
if(interface[0] != '\0'){
2130
fprintf_plus(stderr, "Not using nonexisting interface"
2131
" \"%s\"\n", interface);
2132
}
2133
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2134
interface = NULL;
2135
}
2136
}
2137
}
2138
2139
/* Run network hooks */
2140
{
2141
if(mc.interfaces != NULL){
2142
interfaces_hooks = malloc(mc.interfaces_size);
2143
if(interfaces_hooks == NULL){
2144
perror_plus("malloc");
2145
goto end;
2146
}
2147
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2148
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2149
}
2150
run_network_hooks("start", interfaces_hooks != NULL ?
2151
interfaces_hooks : "", delay);
1464
struct stat st;
1465
1466
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
2152
1519
}
2153
1520
2154
1521
if(not debug){
2155
1522
avahi_set_log_function(empty_log);
2156
1523
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1546
goto end;
1547
}
1548
}
2157
1549
2158
1550
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2159
1551
from the signal handler */
2160
1552
/* Initialize the pseudo-RNG for Avahi */
2161
1553
srand((unsigned int) time(NULL));
2162
simple_poll = avahi_simple_poll_new();
2163
if(simple_poll == NULL){
2164
fprintf_plus(stderr,
2165
"Avahi: Failed to create simple poll object.\n");
1554
mc.simple_poll = avahi_simple_poll_new();
1555
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2166
1557
exitcode = EX_UNAVAILABLE;
2167
1558
goto end;
2168
1559
}
2230
1621
}
2231
1622
}
2232
1623
2233
/* If no interfaces were specified, make a list */
2234
if(mc.interfaces == NULL){
2235
struct dirent **direntries;
2236
/* Look for any good interfaces */
2237
ret = scandir(sys_class_net, &direntries, good_interface,
2238
alphasort);
2239
if(ret >= 1){
2240
/* Add all found interfaces to interfaces list */
2241
for(int i = 0; i < ret; ++i){
2242
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2243
direntries[i]->d_name);
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("argz_add");
2247
continue;
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2251
direntries[i]->d_name);
2252
}
2253
}
2254
free(direntries);
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
#ifdef __linux__
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1649
if(ret == -1){
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1652
}
1653
#endif /* __linux__ */
1654
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1659
#ifdef __linux__
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1662
if(ret == -1){
1663
perror_plus("klogctl");
1664
}
1665
}
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
goto end;
1674
}
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1682
if(ret == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1694
goto end;
1695
}
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1704
#ifdef __linux__
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
perror_plus("klogctl");
1709
}
1710
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
goto end;
1719
}
1720
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1728
break;
1729
}
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1734
}
1735
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
}
1743
#ifdef __linux__
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1747
if(ret == -1){
1748
perror_plus("klogctl");
1749
}
1750
}
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
2255
1760
} else {
2256
free(direntries);
2257
fprintf_plus(stderr, "Could not find a network interface\n");
2258
exitcode = EXIT_FAILURE;
2259
goto end;
2260
}
2261
}
2262
2263
/* Bring up interfaces which are down, and remove any "none"s */
2264
{
2265
char *interface = NULL;
2266
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2267
interface))){
2268
/* If interface name is "none", stop bringing up interfaces.
2269
Also remove all instances of "none" from the list */
2270
if(strcmp(interface, "none") == 0){
2271
argz_delete(&mc.interfaces, &mc.interfaces_size,
2272
interface);
2273
interface = NULL;
2274
while((interface = argz_next(mc.interfaces,
2275
mc.interfaces_size, interface))){
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
2280
}
2281
}
2282
break;
2283
}
2284
bool interface_was_up = interface_is_up(interface);
2285
errno = bring_up_interface(interface, delay);
2286
if(not interface_was_up){
2287
if(errno != 0){
2288
perror_plus("Failed to bring up interface");
2289
} else {
2290
errno = argz_add(&interfaces_to_take_down,
2291
&interfaces_to_take_down_size,
2292
interface);
2293
if(errno != 0){
2294
perror_plus("argz_add");
2295
}
2296
}
2297
}
2298
}
2299
if(debug and (interfaces_to_take_down == NULL)){
2300
fprintf_plus(stderr, "No interfaces were brought up\n");
2301
}
2302
}
2303
2304
/* If we only got one interface, explicitly use only that one */
2305
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2306
if(debug){
2307
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2308
mc.interfaces);
2309
}
2310
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
1766
}
2311
1767
}
2312
1768
2313
1769
if(quit_now){
2314
1770
goto end;
2315
1771
}
2316
1772
2317
ret = init_gnutls_global(pubkey, seckey, &mc);
1773
ret = init_gnutls_global(pubkey, seckey);
2318
1774
if(ret == -1){
2319
fprintf_plus(stderr, "init_gnutls_global failed\n");
1775
fprintf(stderr, "init_gnutls_global failed\n");
2320
1776
exitcode = EX_UNAVAILABLE;
2321
1777
goto end;
2322
1778
} else {
2337
1793
goto end;
2338
1794
}
2339
1795
2340
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2341
fprintf_plus(stderr, "init_gpgme failed\n");
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2342
1798
exitcode = EX_UNAVAILABLE;
2343
1799
goto end;
2344
1800
} else {
2353
1809
/* Connect directly, do not use Zeroconf */
2354
1810
/* (Mainly meant for debugging) */
2355
1811
char *address = strrchr(connect_to, ':');
2356
2357
1812
if(address == NULL){
2358
fprintf_plus(stderr, "No colon in address\n");
1813
fprintf(stderr, "No colon in address\n");
2359
1814
exitcode = EX_USAGE;
2360
1815
goto end;
2361
1816
}
2364
1819
goto end;
2365
1820
}
2366
1821
2367
in_port_t port;
1822
uint16_t port;
2368
1823
errno = 0;
2369
1824
tmpmax = strtoimax(address+1, &tmp, 10);
2370
1825
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2371
or tmpmax != (in_port_t)tmpmax){
2372
fprintf_plus(stderr, "Bad port number\n");
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2373
1828
exitcode = EX_USAGE;
2374
1829
goto end;
2375
1830
}
2376
1831
2377
1832
if(quit_now){
2378
1833
goto end;
2379
1834
}
2380
1835
2381
port = (in_port_t)tmpmax;
1836
port = (uint16_t)tmpmax;
2382
1837
*address = '\0';
2383
1838
/* Colon in address indicates IPv6 */
2384
1839
int af;
2400
1855
}
2401
1856
2402
1857
while(not quit_now){
2403
ret = start_mandos_communication(address, port, if_index, af,
2404
&mc);
1858
ret = start_mandos_communication(address, port, if_index, af);
2405
1859
if(quit_now or ret == 0){
2406
1860
break;
2407
1861
}
2408
1862
if(debug){
2409
fprintf_plus(stderr, "Retrying in %d seconds\n",
2410
(int)retry_interval);
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2411
1865
}
2412
sleep((unsigned int)retry_interval);
1866
sleep((int)retry_interval);
2413
1867
}
2414
1868
2415
if(not quit_now){
1869
if (not quit_now){
2416
1870
exitcode = EXIT_SUCCESS;
2417
1871
}
2418
1872
2419
1873
goto end;
2420
1874
}
2421
1875
2433
1887
config.publish_domain = 0;
2434
1888
2435
1889
/* Allocate a new server */
2436
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2437
&config, NULL, NULL, &ret_errno);
1890
mc.server = avahi_server_new(avahi_simple_poll_get
1891
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
2438
1893
2439
1894
/* Free the Avahi configuration data */
2440
1895
avahi_server_config_free(&config);
2442
1897
2443
1898
/* Check if creating the Avahi server object succeeded */
2444
1899
if(mc.server == NULL){
2445
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2446
avahi_strerror(ret_errno));
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2447
1902
exitcode = EX_UNAVAILABLE;
2448
1903
goto end;
2449
1904
}
2455
1910
/* Create the Avahi service browser */
2456
1911
sb = avahi_s_service_browser_new(mc.server, if_index,
2457
1912
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2458
NULL, 0, browse_callback,
2459
(void *)&mc);
1913
NULL, 0, browse_callback, NULL);
2460
1914
if(sb == NULL){
2461
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2462
avahi_strerror(avahi_server_errno(mc.server)));
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2463
1917
exitcode = EX_UNAVAILABLE;
2464
1918
goto end;
2465
1919
}
2471
1925
/* Run the main loop */
2472
1926
2473
1927
if(debug){
2474
fprintf_plus(stderr, "Starting Avahi loop search\n");
1928
fprintf(stderr, "Starting Avahi loop search\n");
2475
1929
}
2476
1930
2477
ret = avahi_loop_with_timeout(simple_poll,
2478
(int)(retry_interval * 1000), &mc);
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
2479
1933
if(debug){
2480
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2481
(ret == 0) ? "successfully" : "with error");
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2482
1936
}
2483
1937
2484
1938
end:
2485
1939
2486
1940
if(debug){
2487
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2488
1942
}
2489
1943
2490
1944
/* Cleanup things */
2491
free(mc.interfaces);
2492
2493
1945
if(sb != NULL)
2494
1946
avahi_s_service_browser_free(sb);
2495
1947
2496
1948
if(mc.server != NULL)
2497
1949
avahi_server_free(mc.server);
2498
1950
2499
if(simple_poll != NULL)
2500
avahi_simple_poll_free(simple_poll);
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
2501
1953
2502
1954
if(gnutls_initialized){
2503
1955
gnutls_certificate_free_credentials(mc.cred);
2508
1960
if(gpgme_initialized){
2509
1961
gpgme_release(mc.ctx);
2510
1962
}
2511
1963
2512
1964
/* Cleans up the circular linked list of Mandos servers the client
2513
1965
has seen */
2514
1966
if(mc.current_server != NULL){
2520
1972
}
2521
1973
}
2522
1974
2523
/* Re-raise privileges */
2524
{
2525
ret_errno = raise_privileges();
2526
if(ret_errno != 0){
2527
perror_plus("Failed to raise privileges");
2528
} else {
2529
2530
/* Run network hooks */
2531
run_network_hooks("stop", interfaces_hooks != NULL ?
2532
interfaces_hooks : "", delay);
2533
2534
/* Take down the network interfaces which were brought up */
2535
{
2536
char *interface = NULL;
2537
while((interface=argz_next(interfaces_to_take_down,
2538
interfaces_to_take_down_size,
2539
interface))){
2540
ret_errno = take_down_interface(interface);
2541
if(ret_errno != 0){
2542
errno = ret_errno;
2543
perror_plus("Failed to take down interface");
2544
}
2545
}
2546
if(debug and (interfaces_to_take_down == NULL)){
2547
fprintf_plus(stderr, "No interfaces needed to be taken"
2548
" down\n");
2549
}
2550
}
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
2551
1982
}
2552
ret_errno = lower_privileges_permanently();
2553
if(ret_errno != 0){
2554
perror_plus("Failed to lower privileges permanently");
1983
if(geteuid() == 0){
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1992
}
1993
}
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2555
2004
}
2556
2005
}
2557
2006
2558
free(interfaces_to_take_down);
2559
free(interfaces_hooks);
2560
2561
2007
/* Removes the GPGME temp directory and all files inside */
2562
2008
if(tempdir_created){
2563
2009
struct dirent **direntries = NULL;
2564
2010
struct dirent *direntry = NULL;
2565
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2566
2012
alphasort);
2567
if(numentries > 0){
2013
if (numentries > 0){
2568
2014
for(int i = 0; i < numentries; i++){
2569
2015
direntry = direntries[i];
2570
2016
char *fullname = NULL;
2576
2022
}
2577
2023
ret = remove(fullname);
2578
2024
if(ret == -1){
2579
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2580
strerror(errno));
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2581
2027
}
2582
2028
free(fullname);
2583
2029
}
2585
2031
2586
2032
/* need to clean even if 0 because man page doesn't specify */
2587
2033
free(direntries);
2588
if(numentries == -1){
2034
if (numentries == -1){
2589
2035
perror_plus("scandir");
2590
2036
}
2591
2037
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0