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» Revision
237.7.322
(compared to revision 237.15.3)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-07-20 00:06:05 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150720000605-244crrgqx254i3bs
Don't use TEMP_FAILURE_RETRY around close().
* plugin-runner.c: Don't use TEMP_FAILURE_RETRY around close().
* plugins.d/mandos-client.c: - '' -
* plugins.d/usplash.c: - '' -
* plugin-runner.c: Don't use TEMP_FAILURE_RETRY around close().
* plugins.d/mandos-client.c: - '' -
* plugins.d/usplash.c: - '' -
- 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))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
174
198
/*
175
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
200
* bytes. "buffer_capacity" is how much is currently allocated,
177
201
* "buffer_length" is how much is already used.
178
202
*/
203
__attribute__((nonnull, warn_unused_result))
179
204
size_t incbuffer(char **buffer, size_t buffer_length,
180
size_t buffer_capacity){
205
size_t buffer_capacity){
181
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
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;
184
213
return 0;
185
214
}
215
*buffer = new_buf;
186
216
buffer_capacity += BUFFER_SIZE;
187
217
}
188
218
return buffer_capacity;
189
219
}
190
220
191
221
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
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){
195
225
int ret;
196
226
server *new_server = malloc(sizeof(server));
197
227
if(new_server == NULL){
198
228
perror_plus("malloc");
199
return -1;
229
return false;
200
230
}
201
231
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
232
.port = port,
233
.if_index = if_index,
234
.af = af };
205
235
if(new_server->ip == NULL){
206
236
perror_plus("strdup");
207
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;
208
253
}
209
254
/* Special case of first server */
210
if (mc.current_server == NULL){
255
if(*current_server == NULL){
211
256
new_server->next = new_server;
212
257
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
258
*current_server = new_server;
215
259
} else {
216
new_server->next = mc.current_server;
217
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;
218
263
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
227
267
}
228
268
229
269
/*
230
270
* Initialize GPGME.
231
271
*/
232
static bool init_gpgme(const char *seckey,
233
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){
234
277
gpgme_error_t rc;
235
278
gpgme_engine_info_t engine_info;
236
279
237
238
280
/*
239
281
* Helper function to insert pub and seckey to the engine keyring.
240
282
*/
241
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
242
284
int ret;
243
285
int fd;
244
286
gpgme_data_t pgp_data;
251
293
252
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
253
295
if(rc != GPG_ERR_NO_ERROR){
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
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));
256
298
return false;
257
299
}
258
300
259
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
260
302
if(rc != GPG_ERR_NO_ERROR){
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
263
305
return false;
264
306
}
265
307
266
ret = (int)TEMP_FAILURE_RETRY(close(fd));
308
ret = close(fd);
267
309
if(ret == -1){
268
310
perror_plus("close");
269
311
}
272
314
}
273
315
274
316
if(debug){
275
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
276
318
}
277
319
278
320
/* Init GPGME */
279
321
gpgme_check_version(NULL);
280
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
281
323
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
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));
284
326
return false;
285
327
}
286
328
287
329
/* Set GPGME home directory for the OpenPGP engine only */
288
330
rc = gpgme_get_engine_info(&engine_info);
289
331
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
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));
292
334
return false;
293
335
}
294
336
while(engine_info != NULL){
300
342
engine_info = engine_info->next;
301
343
}
302
344
if(engine_info == NULL){
303
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);
304
347
return false;
305
348
}
306
349
307
350
/* Create new GPGME "context" */
308
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
309
352
if(rc != GPG_ERR_NO_ERROR){
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
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));
312
356
return false;
313
357
}
314
358
323
367
* Decrypt OpenPGP data.
324
368
* Returns -1 on error
325
369
*/
370
__attribute__((nonnull, warn_unused_result))
326
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
327
372
size_t crypto_size,
328
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
329
375
gpgme_data_t dh_crypto, dh_plain;
330
376
gpgme_error_t rc;
331
377
ssize_t ret;
333
379
ssize_t plaintext_length = 0;
334
380
335
381
if(debug){
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
337
383
}
338
384
339
385
/* Create new GPGME data buffer from memory cryptotext */
340
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
341
387
0);
342
388
if(rc != GPG_ERR_NO_ERROR){
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
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));
345
391
return -1;
346
392
}
347
393
348
394
/* Create new empty GPGME data buffer for the plaintext */
349
395
rc = gpgme_data_new(&dh_plain);
350
396
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
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));
353
400
gpgme_data_release(dh_crypto);
354
401
return -1;
355
402
}
356
403
357
404
/* Decrypt data from the cryptotext data buffer to the plaintext
358
405
data buffer */
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
360
407
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
363
410
plaintext_length = -1;
364
411
if(debug){
365
412
gpgme_decrypt_result_t result;
366
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
367
414
if(result == NULL){
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
369
416
} else {
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
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);
374
421
if(result->file_name != NULL){
375
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
376
423
}
377
424
gpgme_recipient_t recipient;
378
425
recipient = result->recipients;
379
426
while(recipient != NULL){
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
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");
386
434
recipient = recipient->next;
387
435
}
388
436
}
391
439
}
392
440
393
441
if(debug){
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
395
443
}
396
444
397
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
404
452
*plaintext = NULL;
405
453
while(true){
406
454
plaintext_capacity = incbuffer(plaintext,
407
(size_t)plaintext_length,
408
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
409
457
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
413
461
}
414
462
415
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
428
476
}
429
477
430
478
if(debug){
431
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
432
480
for(ssize_t i = 0; i < plaintext_length; i++){
433
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
434
482
}
445
493
return plaintext_length;
446
494
}
447
495
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
451
if(ret == NULL)
452
ret = "(unknown)";
453
return ret;
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);
454
507
}
455
508
456
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
457
511
static void debuggnutls(__attribute__((unused)) int level,
458
512
const char* string){
459
fprintf(stderr, "GnuTLS: %s", string);
513
fprintf_plus(stderr, "GnuTLS: %s", string);
460
514
}
461
515
516
__attribute__((nonnull, warn_unused_result))
462
517
static int init_gnutls_global(const char *pubkeyfilename,
463
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
464
521
int ret;
522
unsigned int uret;
465
523
466
524
if(debug){
467
fprintf(stderr, "Initializing GnuTLS\n");
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
468
526
}
469
527
470
528
ret = gnutls_global_init();
471
529
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
474
532
return -1;
475
533
}
476
534
483
541
}
484
542
485
543
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
487
545
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
490
548
gnutls_global_deinit();
491
549
return -1;
492
550
}
493
551
494
552
if(debug){
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
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);
498
557
}
499
558
500
559
ret = gnutls_certificate_set_openpgp_key_file
501
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
502
561
GNUTLS_OPENPGP_FMT_BASE64);
503
562
if(ret != GNUTLS_E_SUCCESS){
504
fprintf(stderr,
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
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));
509
568
goto globalfail;
510
569
}
511
570
512
571
/* GnuTLS server initialization */
513
ret = gnutls_dh_params_init(&mc.dh_params);
514
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
517
goto globalfail;
518
}
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
520
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
523
goto globalfail;
524
}
525
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
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);
527
752
528
753
return 0;
529
754
530
755
globalfail:
531
756
532
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
533
758
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
535
760
return -1;
536
761
}
537
762
538
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){
539
766
int ret;
540
767
/* GnuTLS session creation */
541
768
do {
545
772
}
546
773
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
547
774
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
775
fprintf_plus(stderr,
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
550
778
}
551
779
552
780
{
553
781
const char *err;
554
782
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
556
784
if(quit_now){
557
785
gnutls_deinit(*session);
558
786
return -1;
559
787
}
560
788
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
561
789
if(ret != GNUTLS_E_SUCCESS){
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
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));
565
793
gnutls_deinit(*session);
566
794
return -1;
567
795
}
569
797
570
798
do {
571
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
800
mc->cred);
573
801
if(quit_now){
574
802
gnutls_deinit(*session);
575
803
return -1;
576
804
}
577
805
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
578
806
if(ret != GNUTLS_E_SUCCESS){
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
581
809
gnutls_deinit(*session);
582
810
return -1;
583
811
}
585
813
/* ignore client certificate if any. */
586
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
587
815
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
589
590
816
return 0;
591
817
}
592
818
594
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
595
821
__attribute__((unused)) const char *txt){}
596
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
_exit(EX_UNAVAILABLE);
958
}
959
close(helperdir_fd);
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
597
1040
/* Called when a Mandos server is found */
598
static int start_mandos_communication(const char *ip, uint16_t port,
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
599
1043
AvahiIfIndex if_index,
600
int af){
1044
int af, mandos_context *mc){
601
1045
int ret, tcp_sd = -1;
602
1046
ssize_t sret;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
1047
struct sockaddr_storage to;
607
1048
char *buffer = NULL;
608
1049
char *decrypted_buffer = NULL;
609
1050
size_t buffer_length = 0;
612
1053
int retval = -1;
613
1054
gnutls_session_t session;
614
1055
int pf; /* Protocol family */
1056
bool route_added = false;
615
1057
616
1058
errno = 0;
617
1059
628
1070
pf = PF_INET;
629
1071
break;
630
1072
default:
631
fprintf(stderr, "Bad address family: %d\n", af);
1073
fprintf_plus(stderr, "Bad address family: %d\n", af);
632
1074
errno = EINVAL;
633
1075
return -1;
634
1076
}
635
1077
636
ret = init_gnutls_session(&session);
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
1106
return -1;
1107
}
1108
}
1109
1110
ret = init_gnutls_session(&session, mc);
637
1111
if(ret != 0){
638
1112
return -1;
639
1113
}
640
1114
641
1115
if(debug){
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
644
1118
}
645
1119
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
647
1121
if(tcp_sd < 0){
648
1122
int e = errno;
649
1123
perror_plus("socket");
656
1130
goto mandos_end;
657
1131
}
658
1132
659
memset(&to, 0, sizeof(to));
660
1133
if(af == AF_INET6){
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
663
1137
} else { /* IPv4 */
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
666
1141
}
667
1142
if(ret < 0 ){
668
1143
int e = errno;
672
1147
}
673
1148
if(ret == 0){
674
1149
int e = errno;
675
fprintf(stderr, "Bad address: %s\n", ip);
1150
fprintf_plus(stderr, "Bad address: %s\n", ip);
676
1151
errno = e;
677
1152
goto mandos_end;
678
1153
}
679
1154
if(af == AF_INET6){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
687
1158
if(if_index == AVAHI_IF_UNSPEC){
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
1159
fprintf_plus(stderr, "An IPv6 link-local address is"
1160
" incomplete without a network interface\n");
690
1161
errno = EINVAL;
691
1162
goto mandos_end;
692
1163
}
693
1164
/* Set the network interface number as scope */
694
to.in6.sin6_scope_id = (uint32_t)if_index;
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
695
1166
}
696
1167
} else {
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
700
1169
}
701
1170
702
1171
if(quit_now){
710
1179
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
1180
perror_plus("if_indextoname");
712
1181
} else {
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
1182
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1183
"\n", ip, interface, (uintmax_t)port);
715
1184
}
716
1185
} else {
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
1186
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1187
ip, (uintmax_t)port);
719
1188
}
720
1189
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
721
1190
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
const char *pcret;
723
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
726
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
729
}
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
732
} else {
733
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
}
736
}
737
}
738
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
}
749
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
1191
if(af == AF_INET6){
1192
ret = getnameinfo((struct sockaddr *)&to,
1193
sizeof(struct sockaddr_in6),
1194
addrstr, sizeof(addrstr), NULL, 0,
1195
NI_NUMERICHOST);
1196
} else {
1197
ret = getnameinfo((struct sockaddr *)&to,
1198
sizeof(struct sockaddr_in),
1199
addrstr, sizeof(addrstr), NULL, 0,
1200
NI_NUMERICHOST);
1201
}
1202
if(ret == EAI_SYSTEM){
1203
perror_plus("getnameinfo");
1204
} else if(ret != 0) {
1205
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1206
} else if(strcmp(addrstr, ip) != 0){
1207
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1208
}
1209
}
1210
1211
if(quit_now){
1212
errno = EINTR;
1213
goto mandos_end;
1214
}
1215
1216
while(true){
1217
if(af == AF_INET6){
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1220
} else {
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1223
}
1224
if(ret < 0){
1225
if(errno == ENETUNREACH
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
&to)->sin6_addr)))
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1242
1243
Avahi bug reference:
1244
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1246
*/
1247
if(debug){
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
" direct route\n");
1250
}
1251
int e = errno;
1252
route_added = add_local_route(ip, if_index);
1253
if(route_added){
1254
continue;
1255
}
1256
errno = e;
1257
}
1258
if(errno != ECONNREFUSED or debug){
1259
int e = errno;
1260
perror_plus("connect");
1261
errno = e;
1262
}
1263
goto mandos_end;
1264
}
1265
1266
if(quit_now){
1267
errno = EINTR;
1268
goto mandos_end;
1269
}
1270
break;
761
1271
}
762
1272
763
1273
const char *out = mandos_protocol_version;
765
1275
while(true){
766
1276
size_t out_size = strlen(out);
767
1277
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
768
out_size - written));
1278
out_size - written));
769
1279
if(ret == -1){
770
1280
int e = errno;
771
1281
perror_plus("write");
791
1301
}
792
1302
793
1303
if(debug){
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1304
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
795
1305
}
796
1306
797
1307
if(quit_now){
799
1309
goto mandos_end;
800
1310
}
801
1311
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1312
/* This casting via intptr_t is to eliminate warning about casting
1313
an int to a pointer type. This is exactly how the GnuTLS Guile
1314
function "set-session-transport-fd!" does it. */
1315
gnutls_transport_set_ptr(session,
1316
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
804
1317
805
1318
if(quit_now){
806
1319
errno = EINTR;
817
1330
818
1331
if(ret != GNUTLS_E_SUCCESS){
819
1332
if(debug){
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1333
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
821
1334
gnutls_perror(ret);
822
1335
}
823
1336
errno = EPROTO;
827
1340
/* Read OpenPGP packet that contains the wanted password */
828
1341
829
1342
if(debug){
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
1343
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1344
" %s\n", ip);
832
1345
}
833
1346
834
1347
while(true){
839
1352
}
840
1353
841
1354
buffer_capacity = incbuffer(&buffer, buffer_length,
842
buffer_capacity);
1355
buffer_capacity);
843
1356
if(buffer_capacity == 0){
844
1357
int e = errno;
845
1358
perror_plus("incbuffer");
872
1385
}
873
1386
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
874
1387
if(ret < 0){
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1388
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1389
"***\n");
876
1390
gnutls_perror(ret);
877
1391
errno = EPROTO;
878
1392
goto mandos_end;
879
1393
}
880
1394
break;
881
1395
default:
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
1396
fprintf_plus(stderr, "Unknown error while reading data from"
1397
" encrypted session with Mandos server\n");
884
1398
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
1399
errno = EIO;
886
1400
goto mandos_end;
891
1405
}
892
1406
893
1407
if(debug){
894
fprintf(stderr, "Closing TLS session\n");
1408
fprintf_plus(stderr, "Closing TLS session\n");
895
1409
}
896
1410
897
1411
if(quit_now){
909
1423
910
1424
if(buffer_length > 0){
911
1425
ssize_t decrypted_buffer_size;
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
1426
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1427
&decrypted_buffer, mc);
915
1428
if(decrypted_buffer_size >= 0){
916
1429
917
1430
written = 0;
927
1440
if(ret == 0 and ferror(stdout)){
928
1441
int e = errno;
929
1442
if(debug){
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
1443
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1444
strerror(errno));
932
1445
}
933
1446
errno = e;
934
1447
goto mandos_end;
943
1456
944
1457
mandos_end:
945
1458
{
1459
if(route_added){
1460
if(not delete_local_route(ip, if_index)){
1461
fprintf_plus(stderr, "Failed to delete local route to %s on"
1462
" interface %d", ip, if_index);
1463
}
1464
}
946
1465
int e = errno;
947
1466
free(decrypted_buffer);
948
1467
free(buffer);
949
1468
if(tcp_sd >= 0){
950
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1469
ret = close(tcp_sd);
951
1470
}
952
1471
if(ret == -1){
953
1472
if(e == 0){
965
1484
return retval;
966
1485
}
967
1486
1487
__attribute__((nonnull))
968
1488
static void resolve_callback(AvahiSServiceResolver *r,
969
1489
AvahiIfIndex interface,
970
1490
AvahiProtocol proto,
978
1498
AVAHI_GCC_UNUSED AvahiStringList *txt,
979
1499
AVAHI_GCC_UNUSED AvahiLookupResultFlags
980
1500
flags,
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1501
void *mc){
1502
if(r == NULL){
1503
return;
1504
}
983
1505
984
1506
/* Called whenever a service has been resolved successfully or
985
1507
timed out */
986
1508
987
1509
if(quit_now){
1510
avahi_s_service_resolver_free(r);
988
1511
return;
989
1512
}
990
1513
991
1514
switch(event){
992
1515
default:
993
1516
case AVAHI_RESOLVER_FAILURE:
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
1517
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1518
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1519
domain,
1520
avahi_strerror(avahi_server_errno
1521
(((mandos_context*)mc)->server)));
997
1522
break;
998
1523
999
1524
case AVAHI_RESOLVER_FOUND:
1001
1526
char ip[AVAHI_ADDRESS_STR_MAX];
1002
1527
avahi_address_snprint(ip, sizeof(ip), address);
1003
1528
if(debug){
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1529
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1530
PRIdMAX ") on port %" PRIu16 "\n", name,
1531
host_name, ip, (intmax_t)interface, port);
1007
1532
}
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1533
int ret = start_mandos_communication(ip, (in_port_t)port,
1534
interface,
1535
avahi_proto_to_af(proto),
1536
mc);
1010
1537
if(ret == 0){
1011
avahi_simple_poll_quit(mc.simple_poll);
1538
avahi_simple_poll_quit(simple_poll);
1012
1539
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1540
if(not add_server(ip, (in_port_t)port, interface,
1541
avahi_proto_to_af(proto),
1542
&((mandos_context*)mc)->current_server)){
1543
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1544
" list\n", name);
1545
}
1015
1546
}
1016
1547
}
1017
1548
}
1027
1558
const char *domain,
1028
1559
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
1560
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1561
void *mc){
1562
if(b == NULL){
1563
return;
1564
}
1032
1565
1033
1566
/* Called whenever a new services becomes available on the LAN or
1034
1567
is removed from the LAN */
1041
1574
default:
1042
1575
case AVAHI_BROWSER_FAILURE:
1043
1576
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1577
fprintf_plus(stderr, "(Avahi browser) %s\n",
1578
avahi_strerror(avahi_server_errno
1579
(((mandos_context*)mc)->server)));
1580
avahi_simple_poll_quit(simple_poll);
1047
1581
return;
1048
1582
1049
1583
case AVAHI_BROWSER_NEW:
1052
1586
the callback function is called the Avahi server will free the
1053
1587
resolver for us. */
1054
1588
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
1589
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1590
interface, protocol, name, type,
1591
domain, protocol, 0,
1592
resolve_callback, mc) == NULL)
1593
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1594
" %s\n", name,
1595
avahi_strerror(avahi_server_errno
1596
(((mandos_context*)mc)->server)));
1060
1597
break;
1061
1598
1062
1599
case AVAHI_BROWSER_REMOVE:
1065
1602
case AVAHI_BROWSER_ALL_FOR_NOW:
1066
1603
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1067
1604
if(debug){
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1605
fprintf_plus(stderr, "No Mandos server found, still"
1606
" searching...\n");
1069
1607
}
1070
1608
break;
1071
1609
}
1080
1618
signal_received = sig;
1081
1619
int old_errno = errno;
1082
1620
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1621
if(simple_poll != NULL){
1622
avahi_simple_poll_quit(simple_poll);
1085
1623
}
1086
1624
errno = old_errno;
1087
1625
}
1088
1626
1627
__attribute__((nonnull, warn_unused_result))
1089
1628
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
1629
int ret;
1630
error_t ret_errno;
1091
1631
1092
1632
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
1633
if(s < 0){
1634
ret_errno = errno;
1094
1635
perror_plus("socket");
1636
errno = ret_errno;
1095
1637
return false;
1096
1638
}
1097
1639
strcpy(ifr->ifr_name, ifname);
1098
1640
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
1641
if(ret == -1){
1100
1642
if(debug){
1643
ret_errno = errno;
1101
1644
perror_plus("ioctl SIOCGIFFLAGS");
1645
errno = ret_errno;
1102
1646
}
1103
1647
return false;
1104
1648
}
1105
1649
return true;
1106
1650
}
1107
1651
1652
__attribute__((nonnull, warn_unused_result))
1108
1653
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1654
1110
1655
/* Reject the loopback device */
1111
1656
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
1657
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1658
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1659
ifname);
1115
1660
}
1116
1661
return false;
1117
1662
}
1118
1663
/* Accept point-to-point devices only if connect_to is specified */
1119
1664
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
1665
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1666
fprintf_plus(stderr, "Accepting point-to-point interface"
1667
" \"%s\"\n", ifname);
1123
1668
}
1124
1669
return true;
1125
1670
}
1126
1671
/* Otherwise, reject non-broadcast-capable devices */
1127
1672
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
1673
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1674
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1675
" \"%s\"\n", ifname);
1131
1676
}
1132
1677
return false;
1133
1678
}
1134
1679
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
1680
if(ifr->ifr_flags & IFF_NOARP){
1136
1681
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1682
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1683
ifname);
1138
1684
}
1139
1685
return false;
1140
1686
}
1141
1687
1142
1688
/* Accept this device */
1143
1689
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1690
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1145
1691
}
1146
1692
return true;
1147
1693
}
1151
1697
* corresponds to an acceptable network device.
1152
1698
* (This function is passed to scandir(3) as a filter function.)
1153
1699
*/
1700
__attribute__((nonnull, warn_unused_result))
1154
1701
int good_interface(const struct dirent *if_entry){
1155
int ret;
1156
1702
if(if_entry->d_name[0] == '.'){
1157
1703
return 0;
1158
1704
}
1705
1159
1706
struct ifreq ifr;
1160
1161
1707
if(not get_flags(if_entry->d_name, &ifr)){
1708
if(debug){
1709
fprintf_plus(stderr, "Failed to get flags for interface "
1710
"\"%s\"\n", if_entry->d_name);
1711
}
1162
1712
return 0;
1163
1713
}
1164
1714
1169
1719
}
1170
1720
1171
1721
/*
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device which is up.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int up_interface(const struct dirent *if_entry){
1177
ssize_t ssret;
1178
char *flagname = NULL;
1179
if(if_entry->d_name[0] == '.'){
1180
return 0;
1181
}
1182
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1183
if_entry->d_name);
1184
if(ret < 0){
1185
perror_plus("asprintf");
1186
return 0;
1187
}
1188
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1189
if(flags_fd == -1){
1190
perror_plus("open");
1191
free(flagname);
1192
return 0;
1193
}
1194
free(flagname);
1195
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1196
/* read line from flags_fd */
1197
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1198
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1199
flagstring[(size_t)to_read] = '\0';
1200
if(flagstring == NULL){
1201
perror_plus("malloc");
1202
close(flags_fd);
1203
return 0;
1204
}
1205
while(to_read > 0){
1206
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1207
(size_t)to_read));
1208
if(ssret == -1){
1209
perror_plus("read");
1210
free(flagstring);
1211
close(flags_fd);
1212
return 0;
1213
}
1214
to_read -= ssret;
1215
if(ssret == 0){
1216
break;
1217
}
1218
}
1219
close(flags_fd);
1220
intmax_t tmpmax;
1221
char *tmp;
1222
errno = 0;
1223
tmpmax = strtoimax(flagstring, &tmp, 0);
1224
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1225
and not (isspace(*tmp)))
1226
or tmpmax != (ifreq_flags)tmpmax){
1227
if(debug){
1228
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1229
flagstring, if_entry->d_name);
1230
}
1231
free(flagstring);
1232
return 0;
1233
}
1234
free(flagstring);
1235
ifreq_flags flags = (ifreq_flags)tmpmax;
1236
/* Reject the loopback device */
1237
if(flags & IFF_LOOPBACK){
1238
if(debug){
1239
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (flags & IFF_UP)){
1247
return 0;
1248
}
1249
1250
/* Accept point-to-point devices only if connect_to is specified */
1251
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1252
if(debug){
1253
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1254
if_entry->d_name);
1255
}
1256
return 1;
1257
}
1258
/* Otherwise, reject non-broadcast-capable devices */
1259
if(not (flags & IFF_BROADCAST)){
1260
if(debug){
1261
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 0;
1265
}
1266
/* Reject non-ARP interfaces (including dummy interfaces) */
1267
if(flags & IFF_NOARP){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Accept this device */
1275
if(debug){
1276
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1277
if_entry->d_name);
1278
}
1279
return 1;
1280
}
1281
1722
* This function determines if a network interface is up.
1723
*/
1724
__attribute__((nonnull, warn_unused_result))
1725
bool interface_is_up(const char *interface){
1726
struct ifreq ifr;
1727
if(not get_flags(interface, &ifr)){
1728
if(debug){
1729
fprintf_plus(stderr, "Failed to get flags for interface "
1730
"\"%s\"\n", interface);
1731
}
1732
return false;
1733
}
1734
1735
return (bool)(ifr.ifr_flags & IFF_UP);
1736
}
1737
1738
/*
1739
* This function determines if a network interface is running
1740
*/
1741
__attribute__((nonnull, warn_unused_result))
1742
bool interface_is_running(const char *interface){
1743
struct ifreq ifr;
1744
if(not get_flags(interface, &ifr)){
1745
if(debug){
1746
fprintf_plus(stderr, "Failed to get flags for interface "
1747
"\"%s\"\n", interface);
1748
}
1749
return false;
1750
}
1751
1752
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1753
}
1754
1755
__attribute__((nonnull, pure, warn_unused_result))
1282
1756
int notdotentries(const struct dirent *direntry){
1283
1757
/* Skip "." and ".." */
1284
1758
if(direntry->d_name[0] == '.'
1291
1765
}
1292
1766
1293
1767
/* Is this directory entry a runnable program? */
1768
__attribute__((nonnull, warn_unused_result))
1294
1769
int runnable_hook(const struct dirent *direntry){
1295
1770
int ret;
1771
size_t sret;
1296
1772
struct stat st;
1297
1773
1298
1774
if((direntry->d_name)[0] == '\0'){
1300
1776
return 0;
1301
1777
}
1302
1778
1303
/* Save pointer to last character */
1304
char *end = strchr(direntry->d_name, '\0')-1;
1305
1306
if(*end == '~'){
1307
/* Backup name~ */
1308
return 0;
1309
}
1310
1311
if(((direntry->d_name)[0] == '#')
1312
and (*end == '#')){
1313
/* Temporary #name# */
1314
return 0;
1315
}
1316
1317
/* XXX more rules here */
1318
1319
ret = stat(direntry->d_name, &st);
1779
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1780
"abcdefghijklmnopqrstuvwxyz"
1781
"0123456789"
1782
"_.-");
1783
if((direntry->d_name)[sret] != '\0'){
1784
/* Contains non-allowed characters */
1785
if(debug){
1786
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1787
direntry->d_name);
1788
}
1789
return 0;
1790
}
1791
1792
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1320
1793
if(ret == -1){
1321
1794
if(debug){
1322
perror_plus("Could not stat plugin");
1795
perror_plus("Could not stat hook");
1323
1796
}
1324
1797
return 0;
1325
1798
}
1326
if(not (st.st_mode & S_ISREG)){
1799
if(not (S_ISREG(st.st_mode))){
1327
1800
/* Not a regular file */
1801
if(debug){
1802
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1803
direntry->d_name);
1804
}
1328
1805
return 0;
1329
1806
}
1330
1807
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1331
1808
/* Not executable */
1809
if(debug){
1810
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1811
direntry->d_name);
1812
}
1332
1813
return 0;
1333
1814
}
1815
if(debug){
1816
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1817
direntry->d_name);
1818
}
1334
1819
return 1;
1335
1820
}
1336
1821
1337
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1822
__attribute__((nonnull, warn_unused_result))
1823
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1824
mandos_context *mc){
1338
1825
int ret;
1339
1826
struct timespec now;
1340
1827
struct timespec waited_time;
1341
1828
intmax_t block_time;
1342
1829
1343
1830
while(true){
1344
if(mc.current_server == NULL){
1345
if (debug){
1346
fprintf(stderr,
1347
"Wait until first server is found. No timeout!\n");
1831
if(mc->current_server == NULL){
1832
if(debug){
1833
fprintf_plus(stderr, "Wait until first server is found."
1834
" No timeout!\n");
1348
1835
}
1349
1836
ret = avahi_simple_poll_iterate(s, -1);
1350
1837
} else {
1351
if (debug){
1352
fprintf(stderr, "Check current_server if we should run it,"
1353
" or wait\n");
1838
if(debug){
1839
fprintf_plus(stderr, "Check current_server if we should run"
1840
" it, or wait\n");
1354
1841
}
1355
1842
/* the current time */
1356
1843
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1361
1848
/* Calculating in ms how long time between now and server
1362
1849
who we visted longest time ago. Now - last seen. */
1363
1850
waited_time.tv_sec = (now.tv_sec
1364
- mc.current_server->last_seen.tv_sec);
1851
- mc->current_server->last_seen.tv_sec);
1365
1852
waited_time.tv_nsec = (now.tv_nsec
1366
- mc.current_server->last_seen.tv_nsec);
1853
- mc->current_server->last_seen.tv_nsec);
1367
1854
/* total time is 10s/10,000ms.
1368
1855
Converting to s from ms by dividing by 1,000,
1369
1856
and ns to ms by dividing by 1,000,000. */
1371
1858
- ((intmax_t)waited_time.tv_sec * 1000))
1372
1859
- ((intmax_t)waited_time.tv_nsec / 1000000));
1373
1860
1374
if (debug){
1375
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1861
if(debug){
1862
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1863
block_time);
1376
1864
}
1377
1865
1378
1866
if(block_time <= 0){
1379
ret = start_mandos_communication(mc.current_server->ip,
1380
mc.current_server->port,
1381
mc.current_server->if_index,
1382
mc.current_server->af);
1867
ret = start_mandos_communication(mc->current_server->ip,
1868
mc->current_server->port,
1869
mc->current_server->if_index,
1870
mc->current_server->af, mc);
1383
1871
if(ret == 0){
1384
avahi_simple_poll_quit(mc.simple_poll);
1872
avahi_simple_poll_quit(s);
1385
1873
return 0;
1386
1874
}
1387
1875
ret = clock_gettime(CLOCK_MONOTONIC,
1388
&mc.current_server->last_seen);
1876
&mc->current_server->last_seen);
1389
1877
if(ret == -1){
1390
1878
perror_plus("clock_gettime");
1391
1879
return -1;
1392
1880
}
1393
mc.current_server = mc.current_server->next;
1881
mc->current_server = mc->current_server->next;
1394
1882
block_time = 0; /* Call avahi to find new Mandos
1395
1883
servers, but don't block */
1396
1884
}
1398
1886
ret = avahi_simple_poll_iterate(s, (int)block_time);
1399
1887
}
1400
1888
if(ret != 0){
1401
if (ret > 0 or errno != EINTR) {
1889
if(ret > 0 or errno != EINTR){
1402
1890
return (ret != 1) ? ret : 0;
1403
1891
}
1404
1892
}
1405
1893
}
1406
1894
}
1407
1895
1896
__attribute__((nonnull))
1897
void run_network_hooks(const char *mode, const char *interface,
1898
const float delay){
1899
struct dirent **direntries = NULL;
1900
if(hookdir_fd == -1){
1901
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1902
| O_CLOEXEC);
1903
if(hookdir_fd == -1){
1904
if(errno == ENOENT){
1905
if(debug){
1906
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1907
" found\n", hookdir);
1908
}
1909
} else {
1910
perror_plus("open");
1911
}
1912
return;
1913
}
1914
}
1915
#ifdef __GLIBC__
1916
#if __GLIBC_PREREQ(2, 15)
1917
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1918
runnable_hook, alphasort);
1919
#else /* not __GLIBC_PREREQ(2, 15) */
1920
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1921
alphasort);
1922
#endif /* not __GLIBC_PREREQ(2, 15) */
1923
#else /* not __GLIBC__ */
1924
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1925
alphasort);
1926
#endif /* not __GLIBC__ */
1927
if(numhooks == -1){
1928
perror_plus("scandir");
1929
return;
1930
}
1931
struct dirent *direntry;
1932
int ret;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
if(devnull == -1){
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
return;
1937
}
1938
for(int i = 0; i < numhooks; i++){
1939
direntry = direntries[i];
1940
if(debug){
1941
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
direntry->d_name);
1943
}
1944
pid_t hook_pid = fork();
1945
if(hook_pid == 0){
1946
/* Child */
1947
/* Raise privileges */
1948
errno = raise_privileges_permanently();
1949
if(errno != 0){
1950
perror_plus("Failed to raise privileges");
1951
_exit(EX_NOPERM);
1952
}
1953
/* Set group */
1954
errno = 0;
1955
ret = setgid(0);
1956
if(ret == -1){
1957
perror_plus("setgid");
1958
_exit(EX_NOPERM);
1959
}
1960
/* Reset supplementary groups */
1961
errno = 0;
1962
ret = setgroups(0, NULL);
1963
if(ret == -1){
1964
perror_plus("setgroups");
1965
_exit(EX_NOPERM);
1966
}
1967
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
if(ret == -1){
1969
perror_plus("setenv");
1970
_exit(EX_OSERR);
1971
}
1972
ret = setenv("DEVICE", interface, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("MODE", mode, 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
char *delaystring;
1988
ret = asprintf(&delaystring, "%f", (double)delay);
1989
if(ret == -1){
1990
perror_plus("asprintf");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("DELAY", delaystring, 1);
1994
if(ret == -1){
1995
free(delaystring);
1996
perror_plus("setenv");
1997
_exit(EX_OSERR);
1998
}
1999
free(delaystring);
2000
if(connect_to != NULL){
2001
ret = setenv("CONNECT", connect_to, 1);
2002
if(ret == -1){
2003
perror_plus("setenv");
2004
_exit(EX_OSERR);
2005
}
2006
}
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2008
direntry->d_name,
2009
O_RDONLY));
2010
if(hook_fd == -1){
2011
perror_plus("openat");
2012
_exit(EXIT_FAILURE);
2013
}
2014
if(close(hookdir_fd) == -1){
2015
perror_plus("close");
2016
_exit(EXIT_FAILURE);
2017
}
2018
ret = dup2(devnull, STDIN_FILENO);
2019
if(ret == -1){
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
_exit(EX_OSERR);
2022
}
2023
ret = close(devnull);
2024
if(ret == -1){
2025
perror_plus("close");
2026
_exit(EX_OSERR);
2027
}
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
if(ret == -1){
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
_exit(EX_OSERR);
2032
}
2033
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
environ) == -1){
2035
perror_plus("fexecve");
2036
_exit(EXIT_FAILURE);
2037
}
2038
} else {
2039
if(hook_pid == -1){
2040
perror_plus("fork");
2041
free(direntry);
2042
continue;
2043
}
2044
int status;
2045
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2046
perror_plus("waitpid");
2047
free(direntry);
2048
continue;
2049
}
2050
if(WIFEXITED(status)){
2051
if(WEXITSTATUS(status) != 0){
2052
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2053
" with status %d\n", direntry->d_name,
2054
WEXITSTATUS(status));
2055
free(direntry);
2056
continue;
2057
}
2058
} else if(WIFSIGNALED(status)){
2059
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2060
" signal %d\n", direntry->d_name,
2061
WTERMSIG(status));
2062
free(direntry);
2063
continue;
2064
} else {
2065
fprintf_plus(stderr, "Warning: network hook \"%s\""
2066
" crashed\n", direntry->d_name);
2067
free(direntry);
2068
continue;
2069
}
2070
}
2071
if(debug){
2072
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2073
direntry->d_name);
2074
}
2075
free(direntry);
2076
}
2077
free(direntries);
2078
if(close(hookdir_fd) == -1){
2079
perror_plus("close");
2080
} else {
2081
hookdir_fd = -1;
2082
}
2083
close(devnull);
2084
}
2085
2086
__attribute__((nonnull, warn_unused_result))
2087
error_t bring_up_interface(const char *const interface,
2088
const float delay){
2089
error_t old_errno = errno;
2090
int ret;
2091
struct ifreq network;
2092
unsigned int if_index = if_nametoindex(interface);
2093
if(if_index == 0){
2094
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2095
errno = old_errno;
2096
return ENXIO;
2097
}
2098
2099
if(quit_now){
2100
errno = old_errno;
2101
return EINTR;
2102
}
2103
2104
if(not interface_is_up(interface)){
2105
error_t ret_errno = 0, ioctl_errno = 0;
2106
if(not get_flags(interface, &network)){
2107
ret_errno = errno;
2108
fprintf_plus(stderr, "Failed to get flags for interface "
2109
"\"%s\"\n", interface);
2110
errno = old_errno;
2111
return ret_errno;
2112
}
2113
network.ifr_flags |= IFF_UP; /* set flag */
2114
2115
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2116
if(sd == -1){
2117
ret_errno = errno;
2118
perror_plus("socket");
2119
errno = old_errno;
2120
return ret_errno;
2121
}
2122
2123
if(quit_now){
2124
ret = close(sd);
2125
if(ret == -1){
2126
perror_plus("close");
2127
}
2128
errno = old_errno;
2129
return EINTR;
2130
}
2131
2132
if(debug){
2133
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2134
interface);
2135
}
2136
2137
/* Raise privileges */
2138
ret_errno = raise_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to raise privileges");
2142
}
2143
2144
#ifdef __linux__
2145
int ret_linux;
2146
bool restore_loglevel = false;
2147
if(ret_errno == 0){
2148
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2149
messages about the network interface to mess up the prompt */
2150
ret_linux = klogctl(8, NULL, 5);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2153
} else {
2154
restore_loglevel = true;
2155
}
2156
}
2157
#endif /* __linux__ */
2158
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2159
ioctl_errno = errno;
2160
#ifdef __linux__
2161
if(restore_loglevel){
2162
ret_linux = klogctl(7, NULL, 0);
2163
if(ret_linux == -1){
2164
perror_plus("klogctl");
2165
}
2166
}
2167
#endif /* __linux__ */
2168
2169
/* If raise_privileges() succeeded above */
2170
if(ret_errno == 0){
2171
/* Lower privileges */
2172
ret_errno = lower_privileges();
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("Failed to lower privileges");
2176
}
2177
}
2178
2179
/* Close the socket */
2180
ret = close(sd);
2181
if(ret == -1){
2182
perror_plus("close");
2183
}
2184
2185
if(ret_setflags == -1){
2186
errno = ioctl_errno;
2187
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2188
errno = old_errno;
2189
return ioctl_errno;
2190
}
2191
} else if(debug){
2192
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2193
interface);
2194
}
2195
2196
/* Sleep checking until interface is running.
2197
Check every 0.25s, up to total time of delay */
2198
for(int i=0; i < delay * 4; i++){
2199
if(interface_is_running(interface)){
2200
break;
2201
}
2202
struct timespec sleeptime = { .tv_nsec = 250000000 };
2203
ret = nanosleep(&sleeptime, NULL);
2204
if(ret == -1 and errno != EINTR){
2205
perror_plus("nanosleep");
2206
}
2207
}
2208
2209
errno = old_errno;
2210
return 0;
2211
}
2212
2213
__attribute__((nonnull, warn_unused_result))
2214
error_t take_down_interface(const char *const interface){
2215
error_t old_errno = errno;
2216
struct ifreq network;
2217
unsigned int if_index = if_nametoindex(interface);
2218
if(if_index == 0){
2219
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2220
errno = old_errno;
2221
return ENXIO;
2222
}
2223
if(interface_is_up(interface)){
2224
error_t ret_errno = 0, ioctl_errno = 0;
2225
if(not get_flags(interface, &network) and debug){
2226
ret_errno = errno;
2227
fprintf_plus(stderr, "Failed to get flags for interface "
2228
"\"%s\"\n", interface);
2229
errno = old_errno;
2230
return ret_errno;
2231
}
2232
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2233
2234
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2235
if(sd == -1){
2236
ret_errno = errno;
2237
perror_plus("socket");
2238
errno = old_errno;
2239
return ret_errno;
2240
}
2241
2242
if(debug){
2243
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2244
interface);
2245
}
2246
2247
/* Raise privileges */
2248
ret_errno = raise_privileges();
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("Failed to raise privileges");
2252
}
2253
2254
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2255
ioctl_errno = errno;
2256
2257
/* If raise_privileges() succeeded above */
2258
if(ret_errno == 0){
2259
/* Lower privileges */
2260
ret_errno = lower_privileges();
2261
if(ret_errno != 0){
2262
errno = ret_errno;
2263
perror_plus("Failed to lower privileges");
2264
}
2265
}
2266
2267
/* Close the socket */
2268
int ret = close(sd);
2269
if(ret == -1){
2270
perror_plus("close");
2271
}
2272
2273
if(ret_setflags == -1){
2274
errno = ioctl_errno;
2275
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2276
errno = old_errno;
2277
return ioctl_errno;
2278
}
2279
} else if(debug){
2280
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2281
interface);
2282
}
2283
2284
errno = old_errno;
2285
return 0;
2286
}
2287
1408
2288
int main(int argc, char *argv[]){
2289
mandos_context mc = { .server = NULL, .dh_bits = 0,
2290
.priority = "SECURE256:!CTYPE-X.509:"
2291
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2292
.interfaces = NULL, .interfaces_size = 0 };
1409
2293
AvahiSServiceBrowser *sb = NULL;
1410
int error;
2294
error_t ret_errno;
1411
2295
int ret;
1412
2296
intmax_t tmpmax;
1413
2297
char *tmp;
1414
2298
int exitcode = EXIT_SUCCESS;
1415
const char *interface = "";
1416
struct ifreq network;
1417
int sd = -1;
1418
bool take_down_interface = false;
1419
uid_t uid;
1420
gid_t gid;
1421
char tempdir[] = "/tmp/mandosXXXXXX";
1422
bool tempdir_created = false;
2299
char *interfaces_to_take_down = NULL;
2300
size_t interfaces_to_take_down_size = 0;
2301
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2302
char old_tempdir[] = "/tmp/mandosXXXXXX";
2303
char *tempdir = NULL;
1423
2304
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1424
2305
const char *seckey = PATHDIR "/" SECKEY;
1425
2306
const char *pubkey = PATHDIR "/" PUBKEY;
2307
const char *dh_params_file = NULL;
2308
char *interfaces_hooks = NULL;
1426
2309
1427
2310
bool gnutls_initialized = false;
1428
2311
bool gpgme_initialized = false;
1480
2363
.doc = "Bit length of the prime number used in the"
1481
2364
" Diffie-Hellman key exchange",
1482
2365
.group = 2 },
2366
{ .name = "dh-params", .key = 134,
2367
.arg = "FILE",
2368
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2369
" for the Diffie-Hellman key exchange",
2370
.group = 2 },
1483
2371
{ .name = "priority", .key = 130,
1484
2372
.arg = "STRING",
1485
2373
.doc = "GnuTLS priority string for the TLS handshake",
1490
2378
.group = 2 },
1491
2379
{ .name = "retry", .key = 132,
1492
2380
.arg = "SECONDS",
1493
.doc = "Retry interval used when denied by the mandos server",
2381
.doc = "Retry interval used when denied by the Mandos server",
2382
.group = 2 },
2383
{ .name = "network-hook-dir", .key = 133,
2384
.arg = "DIR",
2385
.doc = "Directory where network hooks are located",
1494
2386
.group = 2 },
1495
2387
/*
1496
2388
* These reproduce what we would get without ARGP_NO_HELP
1515
2407
connect_to = arg;
1516
2408
break;
1517
2409
case 'i': /* --interface */
1518
interface = arg;
2410
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2411
arg, (int)',');
2412
if(ret_errno != 0){
2413
argp_error(state, "%s", strerror(ret_errno));
2414
}
1519
2415
break;
1520
2416
case 's': /* --seckey */
1521
2417
seckey = arg;
1532
2428
}
1533
2429
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1534
2430
break;
2431
case 134: /* --dh-params */
2432
dh_params_file = arg;
2433
break;
1535
2434
case 130: /* --priority */
1536
2435
mc.priority = arg;
1537
2436
break;
1550
2449
argp_error(state, "Bad retry interval");
1551
2450
}
1552
2451
break;
2452
case 133: /* --network-hook-dir */
2453
hookdir = arg;
2454
break;
1553
2455
/*
1554
2456
* These reproduce what we would get without ARGP_NO_HELP
1555
2457
*/
1561
2463
argp_state_help(state, state->out_stream,
1562
2464
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1563
2465
case 'V': /* --version */
1564
fprintf(state->out_stream, "%s\n", argp_program_version);
2466
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1565
2467
exit(argp_err_exit_status);
1566
2468
break;
1567
2469
default:
1590
2492
goto end;
1591
2493
}
1592
2494
}
1593
2495
1594
2496
{
1595
2497
/* Work around Debian bug #633582:
1596
2498
<http://bugs.debian.org/633582> */
1597
struct stat st;
1598
1599
/* Re-raise priviliges */
1600
errno = 0;
1601
ret = seteuid(0);
1602
if(ret == -1){
1603
perror_plus("seteuid");
1604
}
1605
1606
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1607
int seckey_fd = open(seckey, O_RDONLY);
1608
if(seckey_fd == -1){
1609
perror_plus("open");
1610
} else {
1611
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1612
if(ret == -1){
1613
perror_plus("fstat");
1614
} else {
1615
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1616
ret = fchown(seckey_fd, uid, gid);
1617
if(ret == -1){
1618
perror_plus("fchown");
1619
}
1620
}
1621
}
1622
TEMP_FAILURE_RETRY(close(seckey_fd));
1623
}
1624
}
1625
1626
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1627
int pubkey_fd = open(pubkey, O_RDONLY);
1628
if(pubkey_fd == -1){
1629
perror_plus("open");
1630
} else {
1631
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1632
if(ret == -1){
1633
perror_plus("fstat");
1634
} else {
1635
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1636
ret = fchown(pubkey_fd, uid, gid);
1637
if(ret == -1){
1638
perror_plus("fchown");
1639
}
1640
}
1641
}
1642
TEMP_FAILURE_RETRY(close(pubkey_fd));
1643
}
1644
}
1645
1646
/* Lower privileges */
1647
errno = 0;
1648
ret = seteuid(uid);
1649
if(ret == -1){
1650
perror_plus("seteuid");
1651
}
1652
}
1653
1654
/* Find network hooks and run them */
1655
{
1656
struct dirent **direntries;
1657
struct dirent *direntry;
1658
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1659
alphasort);
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[0];
1663
char *fullname = NULL;
1664
ret = asprintf(&fullname, "%s/%s", tempdir,
1665
direntry->d_name);
1666
if(ret < 0){
1667
perror_plus("asprintf");
1668
continue;
1669
}
1670
pid_t hook_pid = fork();
1671
if(hook_pid == 0){
1672
/* Child */
1673
dup2(devnull, STDIN_FILENO);
1674
close(devnull);
1675
dup2(STDERR_FILENO, STDOUT_FILENO);
1676
setenv("DEVICE", interface, 1);
1677
setenv("VERBOSE", debug ? "1" : "0", 1);
1678
setenv("MODE", "start", 1);
1679
/* setenv( XXX more here */
1680
ret = execl(fullname, direntry->d_name, "start");
1681
perror_plus("execl");
1682
}
1683
free(fullname);
1684
if(quit_now){
2499
2500
/* Re-raise privileges */
2501
ret_errno = raise_privileges();
2502
if(ret_errno != 0){
2503
errno = ret_errno;
2504
perror_plus("Failed to raise privileges");
2505
} else {
2506
struct stat st;
2507
2508
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2509
int seckey_fd = open(seckey, O_RDONLY);
2510
if(seckey_fd == -1){
2511
perror_plus("open");
2512
} else {
2513
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2514
if(ret == -1){
2515
perror_plus("fstat");
2516
} else {
2517
if(S_ISREG(st.st_mode)
2518
and st.st_uid == 0 and st.st_gid == 0){
2519
ret = fchown(seckey_fd, uid, gid);
2520
if(ret == -1){
2521
perror_plus("fchown");
2522
}
2523
}
2524
}
2525
close(seckey_fd);
2526
}
2527
}
2528
2529
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2530
int pubkey_fd = open(pubkey, O_RDONLY);
2531
if(pubkey_fd == -1){
2532
perror_plus("open");
2533
} else {
2534
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2535
if(ret == -1){
2536
perror_plus("fstat");
2537
} else {
2538
if(S_ISREG(st.st_mode)
2539
and st.st_uid == 0 and st.st_gid == 0){
2540
ret = fchown(pubkey_fd, uid, gid);
2541
if(ret == -1){
2542
perror_plus("fchown");
2543
}
2544
}
2545
}
2546
close(pubkey_fd);
2547
}
2548
}
2549
2550
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2551
int dhparams_fd = open(dh_params_file, O_RDONLY);
2552
if(dhparams_fd == -1){
2553
perror_plus("open");
2554
} else {
2555
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2556
if(ret == -1){
2557
perror_plus("fstat");
2558
} else {
2559
if(S_ISREG(st.st_mode)
2560
and st.st_uid == 0 and st.st_gid == 0){
2561
ret = fchown(dhparams_fd, uid, gid);
2562
if(ret == -1){
2563
perror_plus("fchown");
2564
}
2565
}
2566
}
2567
close(dhparams_fd);
2568
}
2569
}
2570
2571
/* Lower privileges */
2572
ret_errno = lower_privileges();
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to lower privileges");
2576
}
2577
}
2578
}
2579
2580
/* Remove invalid interface names (except "none") */
2581
{
2582
char *interface = NULL;
2583
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2584
interface))){
2585
if(strcmp(interface, "none") != 0
2586
and if_nametoindex(interface) == 0){
2587
if(interface[0] != '\0'){
2588
fprintf_plus(stderr, "Not using nonexisting interface"
2589
" \"%s\"\n", interface);
2590
}
2591
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2592
interface = NULL;
2593
}
2594
}
2595
}
2596
2597
/* Run network hooks */
2598
{
2599
if(mc.interfaces != NULL){
2600
interfaces_hooks = malloc(mc.interfaces_size);
2601
if(interfaces_hooks == NULL){
2602
perror_plus("malloc");
1685
2603
goto end;
1686
2604
}
2605
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2606
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1687
2607
}
1688
close(devnull);
2608
run_network_hooks("start", interfaces_hooks != NULL ?
2609
interfaces_hooks : "", delay);
1689
2610
}
1690
2611
1691
2612
if(not debug){
1692
2613
avahi_set_log_function(empty_log);
1693
2614
}
1694
2615
1695
if(interface[0] == '\0'){
1696
struct dirent **direntries;
1697
ret = scandir(sys_class_net, &direntries, good_interface,
1698
alphasort);
1699
if(ret >= 1){
1700
/* Pick the first good interface */
1701
interface = strdup(direntries[0]->d_name);
1702
if(debug){
1703
fprintf(stderr, "Using interface \"%s\"\n", interface);
1704
}
1705
if(interface == NULL){
1706
perror_plus("malloc");
1707
free(direntries);
1708
exitcode = EXIT_FAILURE;
1709
goto end;
1710
}
1711
free(direntries);
1712
} else {
1713
free(direntries);
1714
fprintf(stderr, "Could not find a network interface\n");
1715
exitcode = EXIT_FAILURE;
1716
goto end;
1717
}
1718
}
1719
1720
2616
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1721
2617
from the signal handler */
1722
2618
/* Initialize the pseudo-RNG for Avahi */
1723
2619
srand((unsigned int) time(NULL));
1724
mc.simple_poll = avahi_simple_poll_new();
1725
if(mc.simple_poll == NULL){
1726
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2620
simple_poll = avahi_simple_poll_new();
2621
if(simple_poll == NULL){
2622
fprintf_plus(stderr,
2623
"Avahi: Failed to create simple poll object.\n");
1727
2624
exitcode = EX_UNAVAILABLE;
1728
2625
goto end;
1729
2626
}
1791
2688
}
1792
2689
}
1793
2690
1794
/* If the interface is down, bring it up */
1795
if(strcmp(interface, "none") != 0){
1796
if_index = (AvahiIfIndex) if_nametoindex(interface);
1797
if(if_index == 0){
1798
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1799
exitcode = EX_UNAVAILABLE;
1800
goto end;
1801
}
1802
1803
if(quit_now){
1804
goto end;
1805
}
1806
1807
/* Re-raise priviliges */
1808
errno = 0;
1809
ret = seteuid(0);
1810
if(ret == -1){
1811
perror_plus("seteuid");
1812
}
1813
1814
#ifdef __linux__
1815
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1816
messages about the network interface to mess up the prompt */
1817
ret = klogctl(8, NULL, 5);
1818
bool restore_loglevel = true;
1819
if(ret == -1){
1820
restore_loglevel = false;
1821
perror_plus("klogctl");
1822
}
1823
#endif /* __linux__ */
1824
1825
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1826
if(sd < 0){
1827
perror_plus("socket");
1828
exitcode = EX_OSERR;
1829
#ifdef __linux__
1830
if(restore_loglevel){
1831
ret = klogctl(7, NULL, 0);
1832
if(ret == -1){
1833
perror_plus("klogctl");
1834
}
1835
}
1836
#endif /* __linux__ */
1837
/* Lower privileges */
1838
errno = 0;
1839
ret = seteuid(uid);
1840
if(ret == -1){
1841
perror_plus("seteuid");
1842
}
1843
goto end;
1844
}
1845
strcpy(network.ifr_name, interface);
1846
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1847
if(ret == -1){
1848
perror_plus("ioctl SIOCGIFFLAGS");
1849
#ifdef __linux__
1850
if(restore_loglevel){
1851
ret = klogctl(7, NULL, 0);
1852
if(ret == -1){
1853
perror_plus("klogctl");
1854
}
1855
}
1856
#endif /* __linux__ */
1857
exitcode = EX_OSERR;
1858
/* Lower privileges */
1859
errno = 0;
1860
ret = seteuid(uid);
1861
if(ret == -1){
1862
perror_plus("seteuid");
1863
}
1864
goto end;
1865
}
1866
if((network.ifr_flags & IFF_UP) == 0){
1867
network.ifr_flags |= IFF_UP;
1868
take_down_interface = true;
1869
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1870
if(ret == -1){
1871
take_down_interface = false;
1872
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1873
exitcode = EX_OSERR;
1874
#ifdef __linux__
1875
if(restore_loglevel){
1876
ret = klogctl(7, NULL, 0);
1877
if(ret == -1){
1878
perror_plus("klogctl");
2691
/* If no interfaces were specified, make a list */
2692
if(mc.interfaces == NULL){
2693
struct dirent **direntries = NULL;
2694
/* Look for any good interfaces */
2695
ret = scandir(sys_class_net, &direntries, good_interface,
2696
alphasort);
2697
if(ret >= 1){
2698
/* Add all found interfaces to interfaces list */
2699
for(int i = 0; i < ret; ++i){
2700
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2701
direntries[i]->d_name);
2702
if(ret_errno != 0){
2703
errno = ret_errno;
2704
perror_plus("argz_add");
2705
free(direntries[i]);
2706
continue;
2707
}
2708
if(debug){
2709
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2710
direntries[i]->d_name);
2711
}
2712
free(direntries[i]);
2713
}
2714
free(direntries);
2715
} else {
2716
if(ret == 0){
2717
free(direntries);
2718
}
2719
fprintf_plus(stderr, "Could not find a network interface\n");
2720
exitcode = EXIT_FAILURE;
2721
goto end;
2722
}
2723
}
2724
2725
/* Bring up interfaces which are down, and remove any "none"s */
2726
{
2727
char *interface = NULL;
2728
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2729
interface))){
2730
/* If interface name is "none", stop bringing up interfaces.
2731
Also remove all instances of "none" from the list */
2732
if(strcmp(interface, "none") == 0){
2733
argz_delete(&mc.interfaces, &mc.interfaces_size,
2734
interface);
2735
interface = NULL;
2736
while((interface = argz_next(mc.interfaces,
2737
mc.interfaces_size, interface))){
2738
if(strcmp(interface, "none") == 0){
2739
argz_delete(&mc.interfaces, &mc.interfaces_size,
2740
interface);
2741
interface = NULL;
1879
2742
}
1880
2743
}
1881
#endif /* __linux__ */
1882
/* Lower privileges */
1883
errno = 0;
1884
ret = seteuid(uid);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
goto end;
1889
}
1890
}
1891
/* Sleep checking until interface is running.
1892
Check every 0.25s, up to total time of delay */
1893
for(int i=0; i < delay * 4; i++){
1894
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1895
if(ret == -1){
1896
perror_plus("ioctl SIOCGIFFLAGS");
1897
} else if(network.ifr_flags & IFF_RUNNING){
1898
2744
break;
1899
2745
}
1900
struct timespec sleeptime = { .tv_nsec = 250000000 };
1901
ret = nanosleep(&sleeptime, NULL);
1902
if(ret == -1 and errno != EINTR){
1903
perror_plus("nanosleep");
1904
}
1905
}
1906
if(not take_down_interface){
1907
/* We won't need the socket anymore */
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1912
}
1913
#ifdef __linux__
1914
if(restore_loglevel){
1915
/* Restores kernel loglevel to default */
1916
ret = klogctl(7, NULL, 0);
1917
if(ret == -1){
1918
perror_plus("klogctl");
1919
}
1920
}
1921
#endif /* __linux__ */
1922
/* Lower privileges */
1923
errno = 0;
1924
if(take_down_interface){
1925
/* Lower privileges */
1926
ret = seteuid(uid);
1927
if(ret == -1){
1928
perror_plus("seteuid");
1929
}
1930
} else {
1931
/* Lower privileges permanently */
1932
ret = setuid(uid);
1933
if(ret == -1){
1934
perror_plus("setuid");
1935
}
1936
}
2746
bool interface_was_up = interface_is_up(interface);
2747
errno = bring_up_interface(interface, delay);
2748
if(not interface_was_up){
2749
if(errno != 0){
2750
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2751
" %s\n", interface, strerror(errno));
2752
} else {
2753
errno = argz_add(&interfaces_to_take_down,
2754
&interfaces_to_take_down_size,
2755
interface);
2756
if(errno != 0){
2757
perror_plus("argz_add");
2758
}
2759
}
2760
}
2761
}
2762
if(debug and (interfaces_to_take_down == NULL)){
2763
fprintf_plus(stderr, "No interfaces were brought up\n");
2764
}
2765
}
2766
2767
/* If we only got one interface, explicitly use only that one */
2768
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2769
if(debug){
2770
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2771
mc.interfaces);
2772
}
2773
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1937
2774
}
1938
2775
1939
2776
if(quit_now){
1940
2777
goto end;
1941
2778
}
1942
2779
1943
ret = init_gnutls_global(pubkey, seckey);
2780
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1944
2781
if(ret == -1){
1945
fprintf(stderr, "init_gnutls_global failed\n");
2782
fprintf_plus(stderr, "init_gnutls_global failed\n");
1946
2783
exitcode = EX_UNAVAILABLE;
1947
2784
goto end;
1948
2785
} else {
1953
2790
goto end;
1954
2791
}
1955
2792
1956
if(mkdtemp(tempdir) == NULL){
2793
/* Try /run/tmp before /tmp */
2794
tempdir = mkdtemp(run_tempdir);
2795
if(tempdir == NULL and errno == ENOENT){
2796
if(debug){
2797
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2798
run_tempdir, old_tempdir);
2799
}
2800
tempdir = mkdtemp(old_tempdir);
2801
}
2802
if(tempdir == NULL){
1957
2803
perror_plus("mkdtemp");
1958
2804
goto end;
1959
2805
}
1960
tempdir_created = true;
1961
2806
1962
2807
if(quit_now){
1963
2808
goto end;
1964
2809
}
1965
2810
1966
if(not init_gpgme(pubkey, seckey, tempdir)){
1967
fprintf(stderr, "init_gpgme failed\n");
2811
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2812
fprintf_plus(stderr, "init_gpgme failed\n");
1968
2813
exitcode = EX_UNAVAILABLE;
1969
2814
goto end;
1970
2815
} else {
1979
2824
/* Connect directly, do not use Zeroconf */
1980
2825
/* (Mainly meant for debugging) */
1981
2826
char *address = strrchr(connect_to, ':');
2827
1982
2828
if(address == NULL){
1983
fprintf(stderr, "No colon in address\n");
2829
fprintf_plus(stderr, "No colon in address\n");
1984
2830
exitcode = EX_USAGE;
1985
2831
goto end;
1986
2832
}
1989
2835
goto end;
1990
2836
}
1991
2837
1992
uint16_t port;
2838
in_port_t port;
1993
2839
errno = 0;
1994
2840
tmpmax = strtoimax(address+1, &tmp, 10);
1995
2841
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1996
or tmpmax != (uint16_t)tmpmax){
1997
fprintf(stderr, "Bad port number\n");
2842
or tmpmax != (in_port_t)tmpmax){
2843
fprintf_plus(stderr, "Bad port number\n");
1998
2844
exitcode = EX_USAGE;
1999
2845
goto end;
2000
2846
}
2001
2847
2002
2848
if(quit_now){
2003
2849
goto end;
2004
2850
}
2005
2851
2006
port = (uint16_t)tmpmax;
2852
port = (in_port_t)tmpmax;
2007
2853
*address = '\0';
2008
2854
/* Colon in address indicates IPv6 */
2009
2855
int af;
2025
2871
}
2026
2872
2027
2873
while(not quit_now){
2028
ret = start_mandos_communication(address, port, if_index, af);
2874
ret = start_mandos_communication(address, port, if_index, af,
2875
&mc);
2029
2876
if(quit_now or ret == 0){
2030
2877
break;
2031
2878
}
2032
2879
if(debug){
2033
fprintf(stderr, "Retrying in %d seconds\n",
2034
(int)retry_interval);
2880
fprintf_plus(stderr, "Retrying in %d seconds\n",
2881
(int)retry_interval);
2035
2882
}
2036
sleep((int)retry_interval);
2883
sleep((unsigned int)retry_interval);
2037
2884
}
2038
2885
2039
if (not quit_now){
2886
if(not quit_now){
2040
2887
exitcode = EXIT_SUCCESS;
2041
2888
}
2042
2889
2057
2904
config.publish_domain = 0;
2058
2905
2059
2906
/* Allocate a new server */
2060
mc.server = avahi_server_new(avahi_simple_poll_get
2061
(mc.simple_poll), &config, NULL,
2062
NULL, &error);
2907
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2908
&config, NULL, NULL, &ret_errno);
2063
2909
2064
2910
/* Free the Avahi configuration data */
2065
2911
avahi_server_config_free(&config);
2067
2913
2068
2914
/* Check if creating the Avahi server object succeeded */
2069
2915
if(mc.server == NULL){
2070
fprintf(stderr, "Failed to create Avahi server: %s\n",
2071
avahi_strerror(error));
2916
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2917
avahi_strerror(ret_errno));
2072
2918
exitcode = EX_UNAVAILABLE;
2073
2919
goto end;
2074
2920
}
2080
2926
/* Create the Avahi service browser */
2081
2927
sb = avahi_s_service_browser_new(mc.server, if_index,
2082
2928
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2083
NULL, 0, browse_callback, NULL);
2929
NULL, 0, browse_callback,
2930
(void *)&mc);
2084
2931
if(sb == NULL){
2085
fprintf(stderr, "Failed to create service browser: %s\n",
2086
avahi_strerror(avahi_server_errno(mc.server)));
2932
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2933
avahi_strerror(avahi_server_errno(mc.server)));
2087
2934
exitcode = EX_UNAVAILABLE;
2088
2935
goto end;
2089
2936
}
2095
2942
/* Run the main loop */
2096
2943
2097
2944
if(debug){
2098
fprintf(stderr, "Starting Avahi loop search\n");
2945
fprintf_plus(stderr, "Starting Avahi loop search\n");
2099
2946
}
2100
2101
ret = avahi_loop_with_timeout(mc.simple_poll,
2102
(int)(retry_interval * 1000));
2947
2948
ret = avahi_loop_with_timeout(simple_poll,
2949
(int)(retry_interval * 1000), &mc);
2103
2950
if(debug){
2104
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2105
(ret == 0) ? "successfully" : "with error");
2951
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2952
(ret == 0) ? "successfully" : "with error");
2106
2953
}
2107
2954
2108
2955
end:
2109
2956
2110
2957
if(debug){
2111
fprintf(stderr, "%s exiting\n", argv[0]);
2958
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2112
2959
}
2113
2960
2114
2961
/* Cleanup things */
2962
free(mc.interfaces);
2963
2115
2964
if(sb != NULL)
2116
2965
avahi_s_service_browser_free(sb);
2117
2966
2118
2967
if(mc.server != NULL)
2119
2968
avahi_server_free(mc.server);
2120
2969
2121
if(mc.simple_poll != NULL)
2122
avahi_simple_poll_free(mc.simple_poll);
2970
if(simple_poll != NULL)
2971
avahi_simple_poll_free(simple_poll);
2123
2972
2124
2973
if(gnutls_initialized){
2125
2974
gnutls_certificate_free_credentials(mc.cred);
2130
2979
if(gpgme_initialized){
2131
2980
gpgme_release(mc.ctx);
2132
2981
}
2133
2982
2134
2983
/* Cleans up the circular linked list of Mandos servers the client
2135
2984
has seen */
2136
2985
if(mc.current_server != NULL){
2137
2986
mc.current_server->prev->next = NULL;
2138
2987
while(mc.current_server != NULL){
2139
2988
server *next = mc.current_server->next;
2989
#ifdef __GNUC__
2990
#pragma GCC diagnostic push
2991
#pragma GCC diagnostic ignored "-Wcast-qual"
2992
#endif
2993
free((char *)(mc.current_server->ip));
2994
#ifdef __GNUC__
2995
#pragma GCC diagnostic pop
2996
#endif
2140
2997
free(mc.current_server);
2141
2998
mc.current_server = next;
2142
2999
}
2143
3000
}
2144
3001
2145
/* XXX run network hooks "stop" here */
2146
2147
/* Take down the network interface */
2148
if(take_down_interface){
2149
/* Re-raise priviliges */
2150
errno = 0;
2151
ret = seteuid(0);
2152
if(ret == -1){
2153
perror_plus("seteuid");
3002
/* Re-raise privileges */
3003
{
3004
ret_errno = raise_privileges();
3005
if(ret_errno != 0){
3006
errno = ret_errno;
3007
perror_plus("Failed to raise privileges");
3008
} else {
3009
3010
/* Run network hooks */
3011
run_network_hooks("stop", interfaces_hooks != NULL ?
3012
interfaces_hooks : "", delay);
3013
3014
/* Take down the network interfaces which were brought up */
3015
{
3016
char *interface = NULL;
3017
while((interface=argz_next(interfaces_to_take_down,
3018
interfaces_to_take_down_size,
3019
interface))){
3020
ret_errno = take_down_interface(interface);
3021
if(ret_errno != 0){
3022
errno = ret_errno;
3023
perror_plus("Failed to take down interface");
3024
}
3025
}
3026
if(debug and (interfaces_to_take_down == NULL)){
3027
fprintf_plus(stderr, "No interfaces needed to be taken"
3028
" down\n");
3029
}
3030
}
2154
3031
}
2155
if(geteuid() == 0){
2156
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2157
if(ret == -1){
2158
perror_plus("ioctl SIOCGIFFLAGS");
2159
} else if(network.ifr_flags & IFF_UP) {
2160
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2161
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2162
if(ret == -1){
2163
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2164
}
2165
}
2166
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2167
if(ret == -1){
2168
perror_plus("close");
2169
}
2170
/* Lower privileges permanently */
2171
errno = 0;
2172
ret = setuid(uid);
2173
if(ret == -1){
2174
perror_plus("setuid");
2175
}
3032
3033
ret_errno = lower_privileges_permanently();
3034
if(ret_errno != 0){
3035
errno = ret_errno;
3036
perror_plus("Failed to lower privileges permanently");
2176
3037
}
2177
3038
}
2178
3039
3040
free(interfaces_to_take_down);
3041
free(interfaces_hooks);
3042
2179
3043
/* Removes the GPGME temp directory and all files inside */
2180
if(tempdir_created){
3044
if(tempdir != NULL){
2181
3045
struct dirent **direntries = NULL;
2182
struct dirent *direntry = NULL;
2183
int numentries = scandir(tempdir, &direntries, notdotentries,
2184
alphasort);
2185
if (numentries > 0){
2186
for(int i = 0; i < numentries; i++){
2187
direntry = direntries[i];
2188
char *fullname = NULL;
2189
ret = asprintf(&fullname, "%s/%s", tempdir,
2190
direntry->d_name);
2191
if(ret < 0){
2192
perror_plus("asprintf");
2193
continue;
2194
}
2195
ret = remove(fullname);
2196
if(ret == -1){
2197
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2198
strerror(errno));
2199
}
2200
free(fullname);
3046
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3047
| O_NOFOLLOW
3048
| O_DIRECTORY
3049
| O_PATH));
3050
if(tempdir_fd == -1){
3051
perror_plus("open");
3052
} else {
3053
#ifdef __GLIBC__
3054
#if __GLIBC_PREREQ(2, 15)
3055
int numentries = scandirat(tempdir_fd, ".", &direntries,
3056
notdotentries, alphasort);
3057
#else /* not __GLIBC_PREREQ(2, 15) */
3058
int numentries = scandir(tempdir, &direntries, notdotentries,
3059
alphasort);
3060
#endif /* not __GLIBC_PREREQ(2, 15) */
3061
#else /* not __GLIBC__ */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3063
alphasort);
3064
#endif /* not __GLIBC__ */
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3067
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3068
if(ret == -1){
3069
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3070
" \"%s\", 0): %s\n", tempdir,
3071
direntries[i]->d_name, strerror(errno));
3072
}
3073
free(direntries[i]);
3074
}
3075
3076
/* need to clean even if 0 because man page doesn't specify */
3077
free(direntries);
3078
if(numentries == -1){
3079
perror_plus("scandir");
3080
}
3081
ret = rmdir(tempdir);
3082
if(ret == -1 and errno != ENOENT){
3083
perror_plus("rmdir");
3084
}
2201
3085
}
2202
}
2203
2204
/* need to clean even if 0 because man page doesn't specify */
2205
free(direntries);
2206
if (numentries == -1){
2207
perror_plus("scandir");
2208
}
2209
ret = rmdir(tempdir);
2210
if(ret == -1 and errno != ENOENT){
2211
perror_plus("rmdir");
3086
close(tempdir_fd);
2212
3087
}
2213
3088
}
2214
3089
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0