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- Committer: Teddy Hogeborn
- Date: 2011-07-25 18:52:11 UTC
- mfrom: (237.7.37 trunk)
- Revision ID: teddy@fukt.bsnet.se-20110725185211-wlitr9jvs70e1xh8
Merge from trunk.
- files removed:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
70
66
program_invocation_short_name */
71
67
#include <time.h> /* nanosleep(), time(), sleep() */
72
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
77
73
*/
78
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
79
75
getuid(), getgid(), seteuid(),
80
setgid(), pause(), _exit(),
81
unlinkat() */
82
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
83
78
#include <iso646.h> /* not, or, and */
84
79
#include <argp.h> /* struct argp_option, error_t, struct
85
80
argp_state, struct argp,
90
85
raise() */
91
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
92
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
93
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
94
WEXITSTATUS(), WTERMSIG() */
95
#include <grp.h> /* setgroups() */
96
#include <argz.h> /* argz_add_sep(), argz_next(),
97
argz_delete(), argz_append(),
98
argz_stringify(), argz_add(),
99
argz_count() */
100
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
101
EAI_SYSTEM, gai_strerror() */
102
88
103
89
#ifdef __linux__
104
90
#include <sys/klog.h> /* klogctl() */
122
108
init_gnutls_session(),
123
109
GNUTLS_* */
124
110
#include <gnutls/openpgp.h>
125
/* gnutls_certificate_set_openpgp_key_file(),
126
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
127
113
128
114
/* GPGME */
129
115
#include <gpgme.h> /* All GPGME types, constants and
137
123
#define PATHDIR "/conf/conf.d/mandos"
138
124
#define SECKEY "seckey.txt"
139
125
#define PUBKEY "pubkey.txt"
140
#define HOOKDIR "/lib/mandos/network-hooks.d"
141
126
142
127
bool debug = false;
143
128
static const char mandos_protocol_version[] = "1";
144
129
const char *argp_program_version = "mandos-client " VERSION;
145
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
146
131
static const char sys_class_net[] = "/sys/class/net";
147
132
char *connect_to = NULL;
148
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
150
uid_t uid = 65534;
151
gid_t gid = 65534;
152
133
153
134
/* Doubly linked list that need to be circularly linked when used */
154
135
typedef struct server{
155
136
const char *ip;
156
in_port_t port;
137
uint16_t port;
157
138
AvahiIfIndex if_index;
158
139
int af;
159
140
struct timespec last_seen;
163
144
164
145
/* Used for passing in values through the Avahi callback functions */
165
146
typedef struct {
147
AvahiSimplePoll *simple_poll;
166
148
AvahiServer *server;
167
149
gnutls_certificate_credentials_t cred;
168
150
unsigned int dh_bits;
170
152
const char *priority;
171
153
gpgme_ctx_t ctx;
172
154
server *current_server;
173
char *interfaces;
174
size_t interfaces_size;
175
155
} mandos_context;
176
156
177
/* global so signal handler can reach it*/
178
AvahiSimplePoll *simple_poll;
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
179
162
180
163
sig_atomic_t quit_now = 0;
181
164
int signal_received = 0;
182
165
183
166
/* Function to use when printing errors */
184
167
void perror_plus(const char *print_text){
185
int e = errno;
186
168
fprintf(stderr, "Mandos plugin %s: ",
187
169
program_invocation_short_name);
188
errno = e;
189
170
perror(print_text);
190
171
}
191
172
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
193
int fprintf_plus(FILE *stream, const char *format, ...){
194
va_list ap;
195
va_start (ap, format);
196
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
198
program_invocation_short_name));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
200
}
201
202
173
/*
203
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
204
175
* bytes. "buffer_capacity" is how much is currently allocated,
205
176
* "buffer_length" is how much is already used.
206
177
*/
207
__attribute__((nonnull, warn_unused_result))
208
178
size_t incbuffer(char **buffer, size_t buffer_length,
209
size_t buffer_capacity){
179
size_t buffer_capacity){
210
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
211
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
212
if(new_buf == NULL){
213
int old_errno = errno;
214
free(*buffer);
215
errno = old_errno;
216
*buffer = NULL;
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
217
183
return 0;
218
184
}
219
*buffer = new_buf;
220
185
buffer_capacity += BUFFER_SIZE;
221
186
}
222
187
return buffer_capacity;
223
188
}
224
189
225
/* Add server to set of servers to retry periodically */
226
__attribute__((nonnull, warn_unused_result))
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
int af, server **current_server){
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
229
193
int ret;
230
194
server *new_server = malloc(sizeof(server));
231
195
if(new_server == NULL){
232
196
perror_plus("malloc");
233
return false;
197
return -1;
234
198
}
235
199
*new_server = (server){ .ip = strdup(ip),
236
.port = port,
237
.if_index = if_index,
238
.af = af };
200
.port = port,
201
.if_index = if_index,
202
.af = af };
239
203
if(new_server->ip == NULL){
240
204
perror_plus("strdup");
241
free(new_server);
242
return false;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
#ifdef __GNUC__
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
250
#endif
251
free((char *)(new_server->ip));
252
#ifdef __GNUC__
253
#pragma GCC diagnostic pop
254
#endif
255
free(new_server);
256
return false;
257
}
258
/* Special case of first server */
259
if(*current_server == NULL){
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
260
209
new_server->next = new_server;
261
210
new_server->prev = new_server;
262
*current_server = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
263
213
} else {
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
267
216
new_server->prev->next = new_server;
268
(*current_server)->prev = new_server;
269
}
270
return true;
217
mc.current_server->prev = new_server;
218
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
if(ret == -1){
221
perror_plus("clock_gettime");
222
return -1;
223
}
224
return 0;
271
225
}
272
226
273
227
/*
274
228
* Initialize GPGME.
275
229
*/
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
280
mandos_context *mc){
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
281
232
gpgme_error_t rc;
282
233
gpgme_engine_info_t engine_info;
283
234
235
284
236
/*
285
237
* Helper function to insert pub and seckey to the engine keyring.
286
238
*/
287
bool import_key(const char * const filename){
239
bool import_key(const char *filename){
288
240
int ret;
289
241
int fd;
290
242
gpgme_data_t pgp_data;
297
249
298
250
rc = gpgme_data_new_from_fd(&pgp_data, fd);
299
251
if(rc != GPG_ERR_NO_ERROR){
300
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
gpgme_strsource(rc), gpgme_strerror(rc));
302
254
return false;
303
255
}
304
256
305
rc = gpgme_op_import(mc->ctx, pgp_data);
257
rc = gpgme_op_import(mc.ctx, pgp_data);
306
258
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
309
261
return false;
310
262
}
311
263
312
ret = close(fd);
264
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
265
if(ret == -1){
314
266
perror_plus("close");
315
267
}
318
270
}
319
271
320
272
if(debug){
321
fprintf_plus(stderr, "Initializing GPGME\n");
273
fprintf(stderr, "Initializing GPGME\n");
322
274
}
323
275
324
276
/* Init GPGME */
325
277
gpgme_check_version(NULL);
326
278
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
327
279
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
329
gpgme_strsource(rc), gpgme_strerror(rc));
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
330
282
return false;
331
283
}
332
284
333
/* Set GPGME home directory for the OpenPGP engine only */
285
/* Set GPGME home directory for the OpenPGP engine only */
334
286
rc = gpgme_get_engine_info(&engine_info);
335
287
if(rc != GPG_ERR_NO_ERROR){
336
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
337
gpgme_strsource(rc), gpgme_strerror(rc));
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
338
290
return false;
339
291
}
340
292
while(engine_info != NULL){
346
298
engine_info = engine_info->next;
347
299
}
348
300
if(engine_info == NULL){
349
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
350
tempdir);
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
351
302
return false;
352
303
}
353
304
354
305
/* Create new GPGME "context" */
355
rc = gpgme_new(&(mc->ctx));
306
rc = gpgme_new(&(mc.ctx));
356
307
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "Mandos plugin mandos-client: "
358
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
359
gpgme_strerror(rc));
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
360
310
return false;
361
311
}
362
312
371
321
* Decrypt OpenPGP data.
372
322
* Returns -1 on error
373
323
*/
374
__attribute__((nonnull, warn_unused_result))
375
324
static ssize_t pgp_packet_decrypt(const char *cryptotext,
376
325
size_t crypto_size,
377
char **plaintext,
378
mandos_context *mc){
326
char **plaintext){
379
327
gpgme_data_t dh_crypto, dh_plain;
380
328
gpgme_error_t rc;
381
329
ssize_t ret;
383
331
ssize_t plaintext_length = 0;
384
332
385
333
if(debug){
386
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
387
335
}
388
336
389
337
/* Create new GPGME data buffer from memory cryptotext */
390
338
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
391
339
0);
392
340
if(rc != GPG_ERR_NO_ERROR){
393
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
394
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
395
343
return -1;
396
344
}
397
345
398
346
/* Create new empty GPGME data buffer for the plaintext */
399
347
rc = gpgme_data_new(&dh_plain);
400
348
if(rc != GPG_ERR_NO_ERROR){
401
fprintf_plus(stderr, "Mandos plugin mandos-client: "
402
"bad gpgme_data_new: %s: %s\n",
403
gpgme_strsource(rc), gpgme_strerror(rc));
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
404
351
gpgme_data_release(dh_crypto);
405
352
return -1;
406
353
}
407
354
408
355
/* Decrypt data from the cryptotext data buffer to the plaintext
409
356
data buffer */
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
358
if(rc != GPG_ERR_NO_ERROR){
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
413
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
414
361
plaintext_length = -1;
415
362
if(debug){
416
363
gpgme_decrypt_result_t result;
417
result = gpgme_op_decrypt_result(mc->ctx);
364
result = gpgme_op_decrypt_result(mc.ctx);
418
365
if(result == NULL){
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
420
367
} else {
421
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
422
result->unsupported_algorithm);
423
fprintf_plus(stderr, "Wrong key usage: %u\n",
424
result->wrong_key_usage);
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
425
372
if(result->file_name != NULL){
426
fprintf_plus(stderr, "File name: %s\n", result->file_name);
373
fprintf(stderr, "File name: %s\n", result->file_name);
427
374
}
428
375
gpgme_recipient_t recipient;
429
376
recipient = result->recipients;
430
377
while(recipient != NULL){
431
fprintf_plus(stderr, "Public key algorithm: %s\n",
432
gpgme_pubkey_algo_name
433
(recipient->pubkey_algo));
434
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
435
fprintf_plus(stderr, "Secret key available: %s\n",
436
recipient->status == GPG_ERR_NO_SECKEY
437
? "No" : "Yes");
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "No" : "Yes");
438
384
recipient = recipient->next;
439
385
}
440
386
}
443
389
}
444
390
445
391
if(debug){
446
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
447
393
}
448
394
449
395
/* Seek back to the beginning of the GPGME plaintext data buffer */
456
402
*plaintext = NULL;
457
403
while(true){
458
404
plaintext_capacity = incbuffer(plaintext,
459
(size_t)plaintext_length,
460
plaintext_capacity);
405
(size_t)plaintext_length,
406
plaintext_capacity);
461
407
if(plaintext_capacity == 0){
462
perror_plus("incbuffer");
463
plaintext_length = -1;
464
goto decrypt_end;
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
465
411
}
466
412
467
413
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
480
426
}
481
427
482
428
if(debug){
483
fprintf_plus(stderr, "Decrypted password is: ");
429
fprintf(stderr, "Decrypted password is: ");
484
430
for(ssize_t i = 0; i < plaintext_length; i++){
485
431
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
486
432
}
497
443
return plaintext_length;
498
444
}
499
445
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
502
if(str == NULL)
503
return "(unknown)";
504
return str;
505
}
506
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
509
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
446
static const char * safer_gnutls_strerror(int value){
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
449
if(ret == NULL)
450
ret = "(unknown)";
451
return ret;
511
452
}
512
453
513
454
/* GnuTLS log function callback */
514
__attribute__((nonnull))
515
455
static void debuggnutls(__attribute__((unused)) int level,
516
456
const char* string){
517
fprintf_plus(stderr, "GnuTLS: %s", string);
457
fprintf(stderr, "GnuTLS: %s", string);
518
458
}
519
459
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
521
460
static int init_gnutls_global(const char *pubkeyfilename,
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
mandos_context *mc){
461
const char *seckeyfilename){
525
462
int ret;
526
unsigned int uret;
527
463
528
464
if(debug){
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
465
fprintf(stderr, "Initializing GnuTLS\n");
466
}
467
468
ret = gnutls_global_init();
469
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
472
return -1;
530
473
}
531
474
532
475
if(debug){
538
481
}
539
482
540
483
/* OpenPGP credentials */
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
542
485
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
safer_gnutls_strerror(ret));
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
488
gnutls_global_deinit();
545
489
return -1;
546
490
}
547
491
548
492
if(debug){
549
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
550
" secret key %s as GnuTLS credentials\n",
551
pubkeyfilename,
552
seckeyfilename);
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
553
496
}
554
497
555
498
ret = gnutls_certificate_set_openpgp_key_file
556
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
557
500
GNUTLS_OPENPGP_FMT_BASE64);
558
501
if(ret != GNUTLS_E_SUCCESS){
559
fprintf_plus(stderr,
560
"Error[%d] while reading the OpenPGP key pair ('%s',"
561
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
562
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
563
safer_gnutls_strerror(ret));
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
564
507
goto globalfail;
565
508
}
566
509
567
510
/* GnuTLS server initialization */
568
ret = gnutls_dh_params_init(&mc->dh_params);
569
if(ret != GNUTLS_E_SUCCESS){
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
571
" initialization: %s\n",
572
safer_gnutls_strerror(ret));
573
goto globalfail;
574
}
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
578
do {
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
580
if(dhpfile == -1){
581
perror_plus("open");
582
dhparamsfilename = NULL;
583
break;
584
}
585
size_t params_capacity = 0;
586
while(true){
587
params_capacity = incbuffer((char **)¶ms.data,
588
(size_t)params.size,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
592
free(params.data);
593
params.data = NULL;
594
dhparamsfilename = NULL;
595
break;
596
}
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
599
BUFFER_SIZE);
600
/* EOF */
601
if(bytes_read == 0){
602
break;
603
}
604
/* check bytes_read for failure */
605
if(bytes_read < 0){
606
perror_plus("read");
607
free(params.data);
608
params.data = NULL;
609
dhparamsfilename = NULL;
610
break;
611
}
612
params.size += (unsigned int)bytes_read;
613
}
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
616
}
617
if(dhparamsfilename == NULL){
618
break;
619
}
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
627
}
628
} while(false);
629
}
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
635
do {
636
int secfile = open(seckeyfilename, O_RDONLY);
637
if(secfile == -1){
638
perror_plus("open");
639
break;
640
}
641
size_t buffer_capacity = 0;
642
while(true){
643
buffer_capacity = incbuffer((char **)&buffer.data,
644
(size_t)buffer.size,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
648
free(buffer.data);
649
buffer.data = NULL;
650
break;
651
}
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
654
BUFFER_SIZE);
655
/* EOF */
656
if(bytes_read == 0){
657
break;
658
}
659
/* check bytes_read for failure */
660
if(bytes_read < 0){
661
perror_plus("read");
662
free(buffer.data);
663
buffer.data = NULL;
664
break;
665
}
666
buffer.size += (unsigned int)bytes_read;
667
}
668
close(secfile);
669
} while(false);
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
673
{
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
678
" structure: %s",
679
safer_gnutls_strerror(ret));
680
free(buffer.data);
681
buffer.data = NULL;
682
} else {
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
688
privkey = NULL;
689
}
690
free(buffer.data);
691
buffer.data = NULL;
692
if(privkey != NULL){
693
/* Use private key to suggest an appropriate
694
sec_param */
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
697
if(debug){
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
701
(sec_param)));
702
}
703
}
704
}
705
}
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
709
if(debug){
710
fprintf_plus(stderr, "Falling back to security parameter"
711
" \"%s\"\n",
712
safe_string(gnutls_sec_param_get_name
713
(sec_param)));
714
}
715
}
716
}
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
718
if(uret != 0){
719
mc->dh_bits = uret;
720
if(debug){
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
724
(sec_param)),
725
mc->dh_bits);
726
}
727
} else {
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
safer_gnutls_strerror(ret));
733
goto globalfail;
734
}
735
} else if(debug){
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
737
mc->dh_bits);
738
}
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
744
goto globalfail;
745
}
746
}
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
511
ret = gnutls_dh_params_init(&mc.dh_params);
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
515
goto globalfail;
516
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
521
goto globalfail;
522
}
523
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
748
525
749
526
return 0;
750
527
751
528
globalfail:
752
529
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
530
gnutls_certificate_free_credentials(mc.cred);
531
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
755
533
return -1;
756
534
}
757
535
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
760
mandos_context *mc){
536
static int init_gnutls_session(gnutls_session_t *session){
761
537
int ret;
762
538
/* GnuTLS session creation */
763
539
do {
767
543
}
768
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
769
545
if(ret != GNUTLS_E_SUCCESS){
770
fprintf_plus(stderr,
771
"Error in GnuTLS session initialization: %s\n",
772
safer_gnutls_strerror(ret));
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
773
548
}
774
549
775
550
{
776
551
const char *err;
777
552
do {
778
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
779
554
if(quit_now){
780
555
gnutls_deinit(*session);
781
556
return -1;
782
557
}
783
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
784
559
if(ret != GNUTLS_E_SUCCESS){
785
fprintf_plus(stderr, "Syntax error at: %s\n", err);
786
fprintf_plus(stderr, "GnuTLS error: %s\n",
787
safer_gnutls_strerror(ret));
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
788
563
gnutls_deinit(*session);
789
564
return -1;
790
565
}
792
567
793
568
do {
794
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
795
mc->cred);
570
mc.cred);
796
571
if(quit_now){
797
572
gnutls_deinit(*session);
798
573
return -1;
799
574
}
800
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
801
576
if(ret != GNUTLS_E_SUCCESS){
802
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
803
safer_gnutls_strerror(ret));
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
804
579
gnutls_deinit(*session);
805
580
return -1;
806
581
}
808
583
/* ignore client certificate if any. */
809
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
810
585
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
587
811
588
return 0;
812
589
}
813
590
815
592
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
816
593
__attribute__((unused)) const char *txt){}
817
594
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
error_t raise_privileges(void){
821
error_t old_errno = errno;
822
error_t ret_errno = 0;
823
if(seteuid(0) == -1){
824
ret_errno = errno;
825
}
826
errno = old_errno;
827
return ret_errno;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
error_t raise_privileges_permanently(void){
833
error_t old_errno = errno;
834
error_t ret_errno = raise_privileges();
835
if(ret_errno != 0){
836
errno = old_errno;
837
return ret_errno;
838
}
839
if(setuid(0) == -1){
840
ret_errno = errno;
841
}
842
errno = old_errno;
843
return ret_errno;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
error_t lower_privileges(void){
849
error_t old_errno = errno;
850
error_t ret_errno = 0;
851
if(seteuid(uid) == -1){
852
ret_errno = errno;
853
}
854
errno = old_errno;
855
return ret_errno;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
error_t lower_privileges_permanently(void){
861
error_t old_errno = errno;
862
error_t ret_errno = 0;
863
if(setuid(uid) == -1){
864
ret_errno = errno;
865
}
866
errno = old_errno;
867
return ret_errno;
868
}
869
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
873
const char *address,
874
AvahiIfIndex if_index){
875
int ret;
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
882
if(debug){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
885
}
886
return false;
887
}
888
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
892
return false;
893
}
894
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
896
if(devnull == -1){
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
898
return false;
899
}
900
pid_t pid = fork();
901
if(pid == 0){
902
/* Child */
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
905
if(errno != 0){
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
908
} else {
909
/* Set group */
910
errno = 0;
911
ret = setgid(0);
912
if(ret == -1){
913
perror_plus("setgid");
914
_exit(EX_NOPERM);
915
}
916
/* Reset supplementary groups */
917
errno = 0;
918
ret = setgroups(0, NULL);
919
if(ret == -1){
920
perror_plus("setgroups");
921
_exit(EX_NOPERM);
922
}
923
}
924
ret = dup2(devnull, STDIN_FILENO);
925
if(ret == -1){
926
perror_plus("dup2(devnull, STDIN_FILENO)");
927
_exit(EX_OSERR);
928
}
929
ret = close(devnull);
930
if(ret == -1){
931
perror_plus("close");
932
_exit(EX_OSERR);
933
}
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
if(ret == -1){
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
937
_exit(EX_OSERR);
938
}
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
O_RDONLY
941
| O_DIRECTORY
942
| O_PATH
943
| O_CLOEXEC));
944
if(helperdir_fd == -1){
945
perror_plus("open");
946
_exit(EX_UNAVAILABLE);
947
}
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
949
helper, O_RDONLY));
950
if(helper_fd == -1){
951
perror_plus("openat");
952
close(helperdir_fd);
953
_exit(EX_UNAVAILABLE);
954
}
955
close(helperdir_fd);
956
#ifdef __GNUC__
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
959
#endif
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
963
environ) == -1){
964
#ifdef __GNUC__
965
#pragma GCC diagnostic pop
966
#endif
967
perror_plus("fexecve");
968
_exit(EXIT_FAILURE);
969
}
970
}
971
if(pid == -1){
972
perror_plus("fork");
973
return false;
974
}
975
int status;
976
pid_t pret = -1;
977
errno = 0;
978
do {
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
986
}
987
if(kill(pid, SIGTERM) == -1){
988
perror_plus("kill");
989
}
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
992
" helper program");
993
}
994
return false;
995
}
996
} while(pret == -1 and errno == EINTR);
997
if(pret == -1){
998
perror_plus("waitpid");
999
return false;
1000
}
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1005
return false;
1006
}
1007
return true;
1008
}
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1012
return false;
1013
}
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1015
return false;
1016
}
1017
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1021
if(debug){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1023
}
1024
return add_delete_local_route(true, address, if_index);
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1032
}
1033
return add_delete_local_route(false, address, if_index);
1034
}
1035
1036
595
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
596
static int start_mandos_communication(const char *ip, uint16_t port,
1039
597
AvahiIfIndex if_index,
1040
int af, mandos_context *mc){
598
int af){
1041
599
int ret, tcp_sd = -1;
1042
600
ssize_t sret;
1043
struct sockaddr_storage to;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
1044
605
char *buffer = NULL;
1045
606
char *decrypted_buffer = NULL;
1046
607
size_t buffer_length = 0;
1049
610
int retval = -1;
1050
611
gnutls_session_t session;
1051
612
int pf; /* Protocol family */
1052
bool route_added = false;
1053
613
1054
614
errno = 0;
1055
615
1066
626
pf = PF_INET;
1067
627
break;
1068
628
default:
1069
fprintf_plus(stderr, "Bad address family: %d\n", af);
629
fprintf(stderr, "Bad address family: %d\n", af);
1070
630
errno = EINVAL;
1071
631
return -1;
1072
632
}
1073
633
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1077
bool match = false;
1078
{
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1081
interface))){
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1083
match = true;
1084
break;
1085
}
1086
}
1087
}
1088
if(not match){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1091
if(debug){
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1095
} else {
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1097
" \"%s\"\n",
1098
if_indextoname((unsigned int)if_index,
1099
interface));
1100
}
1101
}
1102
return -1;
1103
}
1104
}
1105
1106
ret = init_gnutls_session(&session, mc);
634
ret = init_gnutls_session(&session);
1107
635
if(ret != 0){
1108
636
return -1;
1109
637
}
1110
638
1111
639
if(debug){
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1113
PRIuMAX "\n", ip, (uintmax_t)port);
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
1114
642
}
1115
643
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
1117
645
if(tcp_sd < 0){
1118
646
int e = errno;
1119
647
perror_plus("socket");
1126
654
goto mandos_end;
1127
655
}
1128
656
657
memset(&to, 0, sizeof(to));
1129
658
if(af == AF_INET6){
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1133
661
} else { /* IPv4 */
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
1137
664
}
1138
665
if(ret < 0 ){
1139
666
int e = errno;
1143
670
}
1144
671
if(ret == 0){
1145
672
int e = errno;
1146
fprintf_plus(stderr, "Bad address: %s\n", ip);
673
fprintf(stderr, "Bad address: %s\n", ip);
1147
674
errno = e;
1148
675
goto mandos_end;
1149
676
}
1150
677
if(af == AF_INET6){
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
1154
685
if(if_index == AVAHI_IF_UNSPEC){
1155
fprintf_plus(stderr, "An IPv6 link-local address is"
1156
" incomplete without a network interface\n");
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
1157
688
errno = EINVAL;
1158
689
goto mandos_end;
1159
690
}
1160
691
/* Set the network interface number as scope */
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
692
to.in6.sin6_scope_id = (uint32_t)if_index;
1162
693
}
1163
694
} else {
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
1165
698
}
1166
699
1167
700
if(quit_now){
1175
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1176
709
perror_plus("if_indextoname");
1177
710
} else {
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
1180
713
}
1181
714
} else {
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
1184
717
}
1185
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1186
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1187
if(af == AF_INET6){
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1191
NI_NUMERICHOST);
1192
} else {
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
}
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1204
}
1205
}
1206
1207
if(quit_now){
1208
errno = EINTR;
1209
goto mandos_end;
1210
}
1211
1212
while(true){
1213
if(af == AF_INET6){
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1216
} else {
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1219
}
1220
if(ret < 0){
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1227
&to)->sin6_addr)))
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1238
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1242
*/
1243
if(debug){
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1245
" direct route\n");
1246
}
1247
int e = errno;
1248
route_added = add_local_route(ip, if_index);
1249
if(route_added){
1250
continue;
1251
}
1252
errno = e;
1253
}
1254
if(errno != ECONNREFUSED or debug){
1255
int e = errno;
1256
perror_plus("connect");
1257
errno = e;
1258
}
1259
goto mandos_end;
1260
}
1261
1262
if(quit_now){
1263
errno = EINTR;
1264
goto mandos_end;
1265
}
1266
break;
720
const char *pcret;
721
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
724
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
727
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
730
} else {
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
733
}
734
}
735
}
736
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
744
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
746
}
747
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
753
goto mandos_end;
754
}
755
756
if(quit_now){
757
errno = EINTR;
758
goto mandos_end;
1267
759
}
1268
760
1269
761
const char *out = mandos_protocol_version;
1271
763
while(true){
1272
764
size_t out_size = strlen(out);
1273
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1274
out_size - written));
766
out_size - written));
1275
767
if(ret == -1){
1276
768
int e = errno;
1277
769
perror_plus("write");
1297
789
}
1298
790
1299
791
if(debug){
1300
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1301
793
}
1302
794
1303
795
if(quit_now){
1305
797
goto mandos_end;
1306
798
}
1307
799
1308
/* This casting via intptr_t is to eliminate warning about casting
1309
an int to a pointer type. This is exactly how the GnuTLS Guile
1310
function "set-session-transport-fd!" does it. */
1311
gnutls_transport_set_ptr(session,
1312
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
800
/* Spurious warning from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1313
802
1314
803
if(quit_now){
1315
804
errno = EINTR;
1326
815
1327
816
if(ret != GNUTLS_E_SUCCESS){
1328
817
if(debug){
1329
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1330
819
gnutls_perror(ret);
1331
820
}
1332
821
errno = EPROTO;
1336
825
/* Read OpenPGP packet that contains the wanted password */
1337
826
1338
827
if(debug){
1339
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1340
" %s\n", ip);
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
1341
830
}
1342
831
1343
832
while(true){
1348
837
}
1349
838
1350
839
buffer_capacity = incbuffer(&buffer, buffer_length,
1351
buffer_capacity);
840
buffer_capacity);
1352
841
if(buffer_capacity == 0){
1353
842
int e = errno;
1354
843
perror_plus("incbuffer");
1381
870
}
1382
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1383
872
if(ret < 0){
1384
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1385
"***\n");
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1386
874
gnutls_perror(ret);
1387
875
errno = EPROTO;
1388
876
goto mandos_end;
1389
877
}
1390
878
break;
1391
879
default:
1392
fprintf_plus(stderr, "Unknown error while reading data from"
1393
" encrypted session with Mandos server\n");
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
1394
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1395
883
errno = EIO;
1396
884
goto mandos_end;
1401
889
}
1402
890
1403
891
if(debug){
1404
fprintf_plus(stderr, "Closing TLS session\n");
892
fprintf(stderr, "Closing TLS session\n");
1405
893
}
1406
894
1407
895
if(quit_now){
1419
907
1420
908
if(buffer_length > 0){
1421
909
ssize_t decrypted_buffer_size;
1422
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1423
&decrypted_buffer, mc);
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
1424
913
if(decrypted_buffer_size >= 0){
1425
914
1426
915
written = 0;
1436
925
if(ret == 0 and ferror(stdout)){
1437
926
int e = errno;
1438
927
if(debug){
1439
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1440
strerror(errno));
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
1441
930
}
1442
931
errno = e;
1443
932
goto mandos_end;
1452
941
1453
942
mandos_end:
1454
943
{
1455
if(route_added){
1456
if(not delete_local_route(ip, if_index)){
1457
fprintf_plus(stderr, "Failed to delete local route to %s on"
1458
" interface %d", ip, if_index);
1459
}
1460
}
1461
944
int e = errno;
1462
945
free(decrypted_buffer);
1463
946
free(buffer);
1464
947
if(tcp_sd >= 0){
1465
ret = close(tcp_sd);
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1466
949
}
1467
950
if(ret == -1){
1468
951
if(e == 0){
1480
963
return retval;
1481
964
}
1482
965
1483
__attribute__((nonnull))
1484
966
static void resolve_callback(AvahiSServiceResolver *r,
1485
967
AvahiIfIndex interface,
1486
968
AvahiProtocol proto,
1494
976
AVAHI_GCC_UNUSED AvahiStringList *txt,
1495
977
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1496
978
flags,
1497
void *mc){
1498
if(r == NULL){
1499
return;
1500
}
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1501
981
1502
982
/* Called whenever a service has been resolved successfully or
1503
983
timed out */
1504
984
1505
985
if(quit_now){
1506
avahi_s_service_resolver_free(r);
1507
986
return;
1508
987
}
1509
988
1510
989
switch(event){
1511
990
default:
1512
991
case AVAHI_RESOLVER_FAILURE:
1513
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1514
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1515
domain,
1516
avahi_strerror(avahi_server_errno
1517
(((mandos_context*)mc)->server)));
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
1518
995
break;
1519
996
1520
997
case AVAHI_RESOLVER_FOUND:
1522
999
char ip[AVAHI_ADDRESS_STR_MAX];
1523
1000
avahi_address_snprint(ip, sizeof(ip), address);
1524
1001
if(debug){
1525
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1526
PRIdMAX ") on port %" PRIu16 "\n", name,
1527
host_name, ip, (intmax_t)interface, port);
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
1528
1005
}
1529
int ret = start_mandos_communication(ip, (in_port_t)port,
1530
interface,
1531
avahi_proto_to_af(proto),
1532
mc);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1533
1008
if(ret == 0){
1534
avahi_simple_poll_quit(simple_poll);
1009
avahi_simple_poll_quit(mc.simple_poll);
1535
1010
} else {
1536
if(not add_server(ip, (in_port_t)port, interface,
1537
avahi_proto_to_af(proto),
1538
&((mandos_context*)mc)->current_server)){
1539
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1540
" list\n", name);
1541
}
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1542
1013
}
1543
1014
}
1544
1015
}
1554
1025
const char *domain,
1555
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1556
1027
flags,
1557
void *mc){
1558
if(b == NULL){
1559
return;
1560
}
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1561
1030
1562
1031
/* Called whenever a new services becomes available on the LAN or
1563
1032
is removed from the LAN */
1570
1039
default:
1571
1040
case AVAHI_BROWSER_FAILURE:
1572
1041
1573
fprintf_plus(stderr, "(Avahi browser) %s\n",
1574
avahi_strerror(avahi_server_errno
1575
(((mandos_context*)mc)->server)));
1576
avahi_simple_poll_quit(simple_poll);
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1577
1045
return;
1578
1046
1579
1047
case AVAHI_BROWSER_NEW:
1582
1050
the callback function is called the Avahi server will free the
1583
1051
resolver for us. */
1584
1052
1585
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1586
interface, protocol, name, type,
1587
domain, protocol, 0,
1588
resolve_callback, mc) == NULL)
1589
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1590
" %s\n", name,
1591
avahi_strerror(avahi_server_errno
1592
(((mandos_context*)mc)->server)));
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1593
1058
break;
1594
1059
1595
1060
case AVAHI_BROWSER_REMOVE:
1598
1063
case AVAHI_BROWSER_ALL_FOR_NOW:
1599
1064
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1600
1065
if(debug){
1601
fprintf_plus(stderr, "No Mandos server found, still"
1602
" searching...\n");
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1603
1067
}
1604
1068
break;
1605
1069
}
1614
1078
signal_received = sig;
1615
1079
int old_errno = errno;
1616
1080
/* set main loop to exit */
1617
if(simple_poll != NULL){
1618
avahi_simple_poll_quit(simple_poll);
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1619
1083
}
1620
1084
errno = old_errno;
1621
1085
}
1622
1086
1623
__attribute__((nonnull, warn_unused_result))
1624
bool get_flags(const char *ifname, struct ifreq *ifr){
1625
int ret;
1626
error_t ret_errno;
1627
1628
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1629
if(s < 0){
1630
ret_errno = errno;
1631
perror_plus("socket");
1632
errno = ret_errno;
1633
return false;
1634
}
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1637
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1638
if(ret == -1){
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1639
1143
if(debug){
1640
ret_errno = errno;
1641
perror_plus("ioctl SIOCGIFFLAGS");
1642
errno = ret_errno;
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1643
1146
}
1644
return false;
1147
free(flagstring);
1148
return 0;
1645
1149
}
1646
return true;
1647
}
1648
1649
__attribute__((nonnull, warn_unused_result))
1650
bool good_flags(const char *ifname, const struct ifreq *ifr){
1651
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1652
1152
/* Reject the loopback device */
1653
if(ifr->ifr_flags & IFF_LOOPBACK){
1153
if(flags & IFF_LOOPBACK){
1654
1154
if(debug){
1655
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1656
ifname);
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1657
1157
}
1658
return false;
1158
return 0;
1659
1159
}
1660
1160
/* Accept point-to-point devices only if connect_to is specified */
1661
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1662
1162
if(debug){
1663
fprintf_plus(stderr, "Accepting point-to-point interface"
1664
" \"%s\"\n", ifname);
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1665
1165
}
1666
return true;
1166
return 1;
1667
1167
}
1668
1168
/* Otherwise, reject non-broadcast-capable devices */
1669
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1169
if(not (flags & IFF_BROADCAST)){
1670
1170
if(debug){
1671
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1672
" \"%s\"\n", ifname);
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1673
1173
}
1674
return false;
1174
return 0;
1675
1175
}
1676
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1677
if(ifr->ifr_flags & IFF_NOARP){
1177
if(flags & IFF_NOARP){
1678
1178
if(debug){
1679
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1680
ifname);
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1681
1181
}
1682
return false;
1182
return 0;
1683
1183
}
1684
1685
1184
/* Accept this device */
1686
1185
if(debug){
1687
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1688
}
1689
return true;
1690
}
1691
1692
/*
1693
* This function determines if a directory entry in /sys/class/net
1694
* corresponds to an acceptable network device.
1695
* (This function is passed to scandir(3) as a filter function.)
1696
*/
1697
__attribute__((nonnull, warn_unused_result))
1698
int good_interface(const struct dirent *if_entry){
1699
if(if_entry->d_name[0] == '.'){
1700
return 0;
1701
}
1702
1703
struct ifreq ifr;
1704
if(not get_flags(if_entry->d_name, &ifr)){
1705
if(debug){
1706
fprintf_plus(stderr, "Failed to get flags for interface "
1707
"\"%s\"\n", if_entry->d_name);
1708
}
1709
return 0;
1710
}
1711
1712
if(not good_flags(if_entry->d_name, &ifr)){
1713
return 0;
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1714
1188
}
1715
1189
return 1;
1716
1190
}
1717
1191
1718
/*
1719
* This function determines if a network interface is up.
1720
*/
1721
__attribute__((nonnull, warn_unused_result))
1722
bool interface_is_up(const char *interface){
1723
struct ifreq ifr;
1724
if(not get_flags(interface, &ifr)){
1725
if(debug){
1726
fprintf_plus(stderr, "Failed to get flags for interface "
1727
"\"%s\"\n", interface);
1728
}
1729
return false;
1730
}
1731
1732
return (bool)(ifr.ifr_flags & IFF_UP);
1733
}
1734
1735
/*
1736
* This function determines if a network interface is running
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
bool interface_is_running(const char *interface){
1740
struct ifreq ifr;
1741
if(not get_flags(interface, &ifr)){
1742
if(debug){
1743
fprintf_plus(stderr, "Failed to get flags for interface "
1744
"\"%s\"\n", interface);
1745
}
1746
return false;
1747
}
1748
1749
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1750
}
1751
1752
__attribute__((nonnull, pure, warn_unused_result))
1753
1192
int notdotentries(const struct dirent *direntry){
1754
1193
/* Skip "." and ".." */
1755
1194
if(direntry->d_name[0] == '.'
1761
1200
return 1;
1762
1201
}
1763
1202
1764
/* Is this directory entry a runnable program? */
1765
__attribute__((nonnull, warn_unused_result))
1766
int runnable_hook(const struct dirent *direntry){
1767
int ret;
1768
size_t sret;
1769
struct stat st;
1770
1771
if((direntry->d_name)[0] == '\0'){
1772
/* Empty name? */
1773
return 0;
1774
}
1775
1776
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1777
"abcdefghijklmnopqrstuvwxyz"
1778
"0123456789"
1779
"_.-");
1780
if((direntry->d_name)[sret] != '\0'){
1781
/* Contains non-allowed characters */
1782
if(debug){
1783
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1784
direntry->d_name);
1785
}
1786
return 0;
1787
}
1788
1789
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1790
if(ret == -1){
1791
if(debug){
1792
perror_plus("Could not stat hook");
1793
}
1794
return 0;
1795
}
1796
if(not (S_ISREG(st.st_mode))){
1797
/* Not a regular file */
1798
if(debug){
1799
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1800
direntry->d_name);
1801
}
1802
return 0;
1803
}
1804
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1805
/* Not executable */
1806
if(debug){
1807
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1808
direntry->d_name);
1809
}
1810
return 0;
1811
}
1812
if(debug){
1813
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1814
direntry->d_name);
1815
}
1816
return 1;
1817
}
1818
1819
__attribute__((nonnull, warn_unused_result))
1820
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
mandos_context *mc){
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1822
1204
int ret;
1823
1205
struct timespec now;
1824
1206
struct timespec waited_time;
1825
1207
intmax_t block_time;
1826
1208
1827
1209
while(true){
1828
if(mc->current_server == NULL){
1829
if(debug){
1830
fprintf_plus(stderr, "Wait until first server is found."
1831
" No timeout!\n");
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1832
1214
}
1833
1215
ret = avahi_simple_poll_iterate(s, -1);
1834
1216
} else {
1835
if(debug){
1836
fprintf_plus(stderr, "Check current_server if we should run"
1837
" it, or wait\n");
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1838
1220
}
1839
1221
/* the current time */
1840
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1845
1227
/* Calculating in ms how long time between now and server
1846
1228
who we visted longest time ago. Now - last seen. */
1847
1229
waited_time.tv_sec = (now.tv_sec
1848
- mc->current_server->last_seen.tv_sec);
1230
- mc.current_server->last_seen.tv_sec);
1849
1231
waited_time.tv_nsec = (now.tv_nsec
1850
- mc->current_server->last_seen.tv_nsec);
1232
- mc.current_server->last_seen.tv_nsec);
1851
1233
/* total time is 10s/10,000ms.
1852
1234
Converting to s from ms by dividing by 1,000,
1853
1235
and ns to ms by dividing by 1,000,000. */
1854
1236
block_time = ((retry_interval
1855
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1856
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1857
1858
if(debug){
1859
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1860
block_time);
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1861
1242
}
1862
1243
1863
1244
if(block_time <= 0){
1864
ret = start_mandos_communication(mc->current_server->ip,
1865
mc->current_server->port,
1866
mc->current_server->if_index,
1867
mc->current_server->af, mc);
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1868
1249
if(ret == 0){
1869
avahi_simple_poll_quit(s);
1250
avahi_simple_poll_quit(mc.simple_poll);
1870
1251
return 0;
1871
1252
}
1872
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1873
&mc->current_server->last_seen);
1254
&mc.current_server->last_seen);
1874
1255
if(ret == -1){
1875
1256
perror_plus("clock_gettime");
1876
1257
return -1;
1877
1258
}
1878
mc->current_server = mc->current_server->next;
1259
mc.current_server = mc.current_server->next;
1879
1260
block_time = 0; /* Call avahi to find new Mandos
1880
1261
servers, but don't block */
1881
1262
}
1883
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1884
1265
}
1885
1266
if(ret != 0){
1886
if(ret > 0 or errno != EINTR){
1267
if (ret > 0 or errno != EINTR) {
1887
1268
return (ret != 1) ? ret : 0;
1888
1269
}
1889
1270
}
1890
1271
}
1891
1272
}
1892
1273
1893
__attribute__((nonnull))
1894
void run_network_hooks(const char *mode, const char *interface,
1895
const float delay){
1896
struct dirent **direntries = NULL;
1897
if(hookdir_fd == -1){
1898
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1899
| O_CLOEXEC);
1900
if(hookdir_fd == -1){
1901
if(errno == ENOENT){
1902
if(debug){
1903
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1904
" found\n", hookdir);
1905
}
1906
} else {
1907
perror_plus("open");
1908
}
1909
return;
1910
}
1911
}
1912
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
runnable_hook, alphasort);
1914
if(numhooks == -1){
1915
perror_plus("scandir");
1916
return;
1917
}
1918
struct dirent *direntry;
1919
int ret;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1921
if(devnull == -1){
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1923
return;
1924
}
1925
for(int i = 0; i < numhooks; i++){
1926
direntry = direntries[i];
1927
if(debug){
1928
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1929
direntry->d_name);
1930
}
1931
pid_t hook_pid = fork();
1932
if(hook_pid == 0){
1933
/* Child */
1934
/* Raise privileges */
1935
errno = raise_privileges_permanently();
1936
if(errno != 0){
1937
perror_plus("Failed to raise privileges");
1938
_exit(EX_NOPERM);
1939
}
1940
/* Set group */
1941
errno = 0;
1942
ret = setgid(0);
1943
if(ret == -1){
1944
perror_plus("setgid");
1945
_exit(EX_NOPERM);
1946
}
1947
/* Reset supplementary groups */
1948
errno = 0;
1949
ret = setgroups(0, NULL);
1950
if(ret == -1){
1951
perror_plus("setgroups");
1952
_exit(EX_NOPERM);
1953
}
1954
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1955
if(ret == -1){
1956
perror_plus("setenv");
1957
_exit(EX_OSERR);
1958
}
1959
ret = setenv("DEVICE", interface, 1);
1960
if(ret == -1){
1961
perror_plus("setenv");
1962
_exit(EX_OSERR);
1963
}
1964
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1965
if(ret == -1){
1966
perror_plus("setenv");
1967
_exit(EX_OSERR);
1968
}
1969
ret = setenv("MODE", mode, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
char *delaystring;
1975
ret = asprintf(&delaystring, "%f", (double)delay);
1976
if(ret == -1){
1977
perror_plus("asprintf");
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("DELAY", delaystring, 1);
1981
if(ret == -1){
1982
free(delaystring);
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
free(delaystring);
1987
if(connect_to != NULL){
1988
ret = setenv("CONNECT", connect_to, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
}
1994
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1995
direntry->d_name,
1996
O_RDONLY));
1997
if(hook_fd == -1){
1998
perror_plus("openat");
1999
_exit(EXIT_FAILURE);
2000
}
2001
if(close(hookdir_fd) == -1){
2002
perror_plus("close");
2003
_exit(EXIT_FAILURE);
2004
}
2005
ret = dup2(devnull, STDIN_FILENO);
2006
if(ret == -1){
2007
perror_plus("dup2(devnull, STDIN_FILENO)");
2008
_exit(EX_OSERR);
2009
}
2010
ret = close(devnull);
2011
if(ret == -1){
2012
perror_plus("close");
2013
_exit(EX_OSERR);
2014
}
2015
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2016
if(ret == -1){
2017
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2018
_exit(EX_OSERR);
2019
}
2020
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2021
environ) == -1){
2022
perror_plus("fexecve");
2023
_exit(EXIT_FAILURE);
2024
}
2025
} else {
2026
if(hook_pid == -1){
2027
perror_plus("fork");
2028
free(direntry);
2029
continue;
2030
}
2031
int status;
2032
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2033
perror_plus("waitpid");
2034
free(direntry);
2035
continue;
2036
}
2037
if(WIFEXITED(status)){
2038
if(WEXITSTATUS(status) != 0){
2039
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2040
" with status %d\n", direntry->d_name,
2041
WEXITSTATUS(status));
2042
free(direntry);
2043
continue;
2044
}
2045
} else if(WIFSIGNALED(status)){
2046
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2047
" signal %d\n", direntry->d_name,
2048
WTERMSIG(status));
2049
free(direntry);
2050
continue;
2051
} else {
2052
fprintf_plus(stderr, "Warning: network hook \"%s\""
2053
" crashed\n", direntry->d_name);
2054
free(direntry);
2055
continue;
2056
}
2057
}
2058
if(debug){
2059
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2060
direntry->d_name);
2061
}
2062
free(direntry);
2063
}
2064
free(direntries);
2065
if(close(hookdir_fd) == -1){
2066
perror_plus("close");
2067
} else {
2068
hookdir_fd = -1;
2069
}
2070
close(devnull);
2071
}
2072
2073
__attribute__((nonnull, warn_unused_result))
2074
error_t bring_up_interface(const char *const interface,
2075
const float delay){
2076
error_t old_errno = errno;
2077
int ret;
2078
struct ifreq network;
2079
unsigned int if_index = if_nametoindex(interface);
2080
if(if_index == 0){
2081
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2082
errno = old_errno;
2083
return ENXIO;
2084
}
2085
2086
if(quit_now){
2087
errno = old_errno;
2088
return EINTR;
2089
}
2090
2091
if(not interface_is_up(interface)){
2092
error_t ret_errno = 0, ioctl_errno = 0;
2093
if(not get_flags(interface, &network)){
2094
ret_errno = errno;
2095
fprintf_plus(stderr, "Failed to get flags for interface "
2096
"\"%s\"\n", interface);
2097
errno = old_errno;
2098
return ret_errno;
2099
}
2100
network.ifr_flags |= IFF_UP; /* set flag */
2101
2102
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2103
if(sd == -1){
2104
ret_errno = errno;
2105
perror_plus("socket");
2106
errno = old_errno;
2107
return ret_errno;
2108
}
2109
2110
if(quit_now){
2111
ret = close(sd);
2112
if(ret == -1){
2113
perror_plus("close");
2114
}
2115
errno = old_errno;
2116
return EINTR;
2117
}
2118
2119
if(debug){
2120
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2121
interface);
2122
}
2123
2124
/* Raise privileges */
2125
ret_errno = raise_privileges();
2126
if(ret_errno != 0){
2127
errno = ret_errno;
2128
perror_plus("Failed to raise privileges");
2129
}
2130
2131
#ifdef __linux__
2132
int ret_linux;
2133
bool restore_loglevel = false;
2134
if(ret_errno == 0){
2135
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2136
messages about the network interface to mess up the prompt */
2137
ret_linux = klogctl(8, NULL, 5);
2138
if(ret_linux == -1){
2139
perror_plus("klogctl");
2140
} else {
2141
restore_loglevel = true;
2142
}
2143
}
2144
#endif /* __linux__ */
2145
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2146
ioctl_errno = errno;
2147
#ifdef __linux__
2148
if(restore_loglevel){
2149
ret_linux = klogctl(7, NULL, 0);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2152
}
2153
}
2154
#endif /* __linux__ */
2155
2156
/* If raise_privileges() succeeded above */
2157
if(ret_errno == 0){
2158
/* Lower privileges */
2159
ret_errno = lower_privileges();
2160
if(ret_errno != 0){
2161
errno = ret_errno;
2162
perror_plus("Failed to lower privileges");
2163
}
2164
}
2165
2166
/* Close the socket */
2167
ret = close(sd);
2168
if(ret == -1){
2169
perror_plus("close");
2170
}
2171
2172
if(ret_setflags == -1){
2173
errno = ioctl_errno;
2174
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2175
errno = old_errno;
2176
return ioctl_errno;
2177
}
2178
} else if(debug){
2179
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2180
interface);
2181
}
2182
2183
/* Sleep checking until interface is running.
2184
Check every 0.25s, up to total time of delay */
2185
for(int i=0; i < delay * 4; i++){
2186
if(interface_is_running(interface)){
2187
break;
2188
}
2189
struct timespec sleeptime = { .tv_nsec = 250000000 };
2190
ret = nanosleep(&sleeptime, NULL);
2191
if(ret == -1 and errno != EINTR){
2192
perror_plus("nanosleep");
2193
}
2194
}
2195
2196
errno = old_errno;
2197
return 0;
2198
}
2199
2200
__attribute__((nonnull, warn_unused_result))
2201
error_t take_down_interface(const char *const interface){
2202
error_t old_errno = errno;
2203
struct ifreq network;
2204
unsigned int if_index = if_nametoindex(interface);
2205
if(if_index == 0){
2206
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2207
errno = old_errno;
2208
return ENXIO;
2209
}
2210
if(interface_is_up(interface)){
2211
error_t ret_errno = 0, ioctl_errno = 0;
2212
if(not get_flags(interface, &network) and debug){
2213
ret_errno = errno;
2214
fprintf_plus(stderr, "Failed to get flags for interface "
2215
"\"%s\"\n", interface);
2216
errno = old_errno;
2217
return ret_errno;
2218
}
2219
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2220
2221
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2222
if(sd == -1){
2223
ret_errno = errno;
2224
perror_plus("socket");
2225
errno = old_errno;
2226
return ret_errno;
2227
}
2228
2229
if(debug){
2230
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2231
interface);
2232
}
2233
2234
/* Raise privileges */
2235
ret_errno = raise_privileges();
2236
if(ret_errno != 0){
2237
errno = ret_errno;
2238
perror_plus("Failed to raise privileges");
2239
}
2240
2241
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2242
ioctl_errno = errno;
2243
2244
/* If raise_privileges() succeeded above */
2245
if(ret_errno == 0){
2246
/* Lower privileges */
2247
ret_errno = lower_privileges();
2248
if(ret_errno != 0){
2249
errno = ret_errno;
2250
perror_plus("Failed to lower privileges");
2251
}
2252
}
2253
2254
/* Close the socket */
2255
int ret = close(sd);
2256
if(ret == -1){
2257
perror_plus("close");
2258
}
2259
2260
if(ret_setflags == -1){
2261
errno = ioctl_errno;
2262
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2263
errno = old_errno;
2264
return ioctl_errno;
2265
}
2266
} else if(debug){
2267
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2268
interface);
2269
}
2270
2271
errno = old_errno;
2272
return 0;
2273
}
2274
2275
1274
int main(int argc, char *argv[]){
2276
mandos_context mc = { .server = NULL, .dh_bits = 0,
2277
.priority = "SECURE256:!CTYPE-X.509"
2278
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2279
.current_server = NULL, .interfaces = NULL,
2280
.interfaces_size = 0 };
2281
1275
AvahiSServiceBrowser *sb = NULL;
2282
error_t ret_errno;
1276
int error;
2283
1277
int ret;
2284
1278
intmax_t tmpmax;
2285
1279
char *tmp;
2286
1280
int exitcode = EXIT_SUCCESS;
2287
char *interfaces_to_take_down = NULL;
2288
size_t interfaces_to_take_down_size = 0;
2289
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2290
char old_tempdir[] = "/tmp/mandosXXXXXX";
2291
char *tempdir = NULL;
1281
const char *interface = "";
1282
struct ifreq network;
1283
int sd = -1;
1284
bool take_down_interface = false;
1285
uid_t uid;
1286
gid_t gid;
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1288
bool tempdir_created = false;
2292
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2293
1290
const char *seckey = PATHDIR "/" SECKEY;
2294
1291
const char *pubkey = PATHDIR "/" PUBKEY;
2295
const char *dh_params_file = NULL;
2296
char *interfaces_hooks = NULL;
2297
1292
2298
1293
bool gnutls_initialized = false;
2299
1294
bool gpgme_initialized = false;
2351
1346
.doc = "Bit length of the prime number used in the"
2352
1347
" Diffie-Hellman key exchange",
2353
1348
.group = 2 },
2354
{ .name = "dh-params", .key = 134,
2355
.arg = "FILE",
2356
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2357
" for the Diffie-Hellman key exchange",
2358
.group = 2 },
2359
1349
{ .name = "priority", .key = 130,
2360
1350
.arg = "STRING",
2361
1351
.doc = "GnuTLS priority string for the TLS handshake",
2366
1356
.group = 2 },
2367
1357
{ .name = "retry", .key = 132,
2368
1358
.arg = "SECONDS",
2369
.doc = "Retry interval used when denied by the Mandos server",
2370
.group = 2 },
2371
{ .name = "network-hook-dir", .key = 133,
2372
.arg = "DIR",
2373
.doc = "Directory where network hooks are located",
1359
.doc = "Retry interval used when denied by the mandos server",
2374
1360
.group = 2 },
2375
1361
/*
2376
1362
* These reproduce what we would get without ARGP_NO_HELP
2395
1381
connect_to = arg;
2396
1382
break;
2397
1383
case 'i': /* --interface */
2398
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2399
arg, (int)',');
2400
if(ret_errno != 0){
2401
argp_error(state, "%s", strerror(ret_errno));
2402
}
1384
interface = arg;
2403
1385
break;
2404
1386
case 's': /* --seckey */
2405
1387
seckey = arg;
2416
1398
}
2417
1399
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2418
1400
break;
2419
case 134: /* --dh-params */
2420
dh_params_file = arg;
2421
break;
2422
1401
case 130: /* --priority */
2423
1402
mc.priority = arg;
2424
1403
break;
2432
1411
errno = 0;
2433
1412
retry_interval = strtod(arg, &tmp);
2434
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
2435
or (retry_interval * 1000) > INT_MAX
2436
or retry_interval < 0){
1414
or (retry_interval * 1000) > INT_MAX){
2437
1415
argp_error(state, "Bad retry interval");
2438
1416
}
2439
1417
break;
2440
case 133: /* --network-hook-dir */
2441
hookdir = arg;
2442
break;
2443
1418
/*
2444
1419
* These reproduce what we would get without ARGP_NO_HELP
2445
1420
*/
2451
1426
argp_state_help(state, state->out_stream,
2452
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2453
1428
case 'V': /* --version */
2454
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
2455
1430
exit(argp_err_exit_status);
2456
1431
break;
2457
1432
default:
2480
1455
goto end;
2481
1456
}
2482
1457
}
2483
1458
2484
1459
{
2485
1460
/* Work around Debian bug #633582:
2486
1461
<http://bugs.debian.org/633582> */
2487
2488
/* Re-raise privileges */
2489
ret_errno = raise_privileges();
2490
if(ret_errno != 0){
2491
errno = ret_errno;
2492
perror_plus("Failed to raise privileges");
2493
} else {
2494
struct stat st;
2495
2496
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2497
int seckey_fd = open(seckey, O_RDONLY);
2498
if(seckey_fd == -1){
2499
perror_plus("open");
2500
} else {
2501
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2502
if(ret == -1){
2503
perror_plus("fstat");
2504
} else {
2505
if(S_ISREG(st.st_mode)
2506
and st.st_uid == 0 and st.st_gid == 0){
2507
ret = fchown(seckey_fd, uid, gid);
2508
if(ret == -1){
2509
perror_plus("fchown");
2510
}
2511
}
2512
}
2513
close(seckey_fd);
2514
}
2515
}
2516
2517
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2518
int pubkey_fd = open(pubkey, O_RDONLY);
2519
if(pubkey_fd == -1){
2520
perror_plus("open");
2521
} else {
2522
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2523
if(ret == -1){
2524
perror_plus("fstat");
2525
} else {
2526
if(S_ISREG(st.st_mode)
2527
and st.st_uid == 0 and st.st_gid == 0){
2528
ret = fchown(pubkey_fd, uid, gid);
2529
if(ret == -1){
2530
perror_plus("fchown");
2531
}
2532
}
2533
}
2534
close(pubkey_fd);
2535
}
2536
}
2537
2538
if(dh_params_file != NULL
2539
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2540
int dhparams_fd = open(dh_params_file, O_RDONLY);
2541
if(dhparams_fd == -1){
2542
perror_plus("open");
2543
} else {
2544
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2545
if(ret == -1){
2546
perror_plus("fstat");
2547
} else {
2548
if(S_ISREG(st.st_mode)
2549
and st.st_uid == 0 and st.st_gid == 0){
2550
ret = fchown(dhparams_fd, uid, gid);
2551
if(ret == -1){
2552
perror_plus("fchown");
2553
}
2554
}
2555
}
2556
close(dhparams_fd);
2557
}
2558
}
2559
2560
/* Lower privileges */
2561
ret_errno = lower_privileges();
2562
if(ret_errno != 0){
2563
errno = ret_errno;
2564
perror_plus("Failed to lower privileges");
2565
}
2566
}
2567
}
2568
2569
/* Remove invalid interface names (except "none") */
2570
{
2571
char *interface = NULL;
2572
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2573
interface))){
2574
if(strcmp(interface, "none") != 0
2575
and if_nametoindex(interface) == 0){
2576
if(interface[0] != '\0'){
2577
fprintf_plus(stderr, "Not using nonexisting interface"
2578
" \"%s\"\n", interface);
2579
}
2580
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2581
interface = NULL;
2582
}
2583
}
2584
}
2585
2586
/* Run network hooks */
2587
{
2588
if(mc.interfaces != NULL){
2589
interfaces_hooks = malloc(mc.interfaces_size);
2590
if(interfaces_hooks == NULL){
2591
perror_plus("malloc");
2592
goto end;
2593
}
2594
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2595
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2596
}
2597
run_network_hooks("start", interfaces_hooks != NULL ?
2598
interfaces_hooks : "", delay);
1462
struct stat st;
1463
1464
/* Re-raise priviliges */
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1512
}
2599
1513
}
2600
1514
2601
1515
if(not debug){
2602
1516
avahi_set_log_function(empty_log);
2603
1517
}
1518
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1522
alphasort);
1523
if(ret >= 1){
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1526
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
}
1529
if(interface == NULL){
1530
perror_plus("malloc");
1531
free(direntries);
1532
exitcode = EXIT_FAILURE;
1533
goto end;
1534
}
1535
free(direntries);
1536
} else {
1537
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1539
exitcode = EXIT_FAILURE;
1540
goto end;
1541
}
1542
}
2604
1543
2605
1544
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2606
1545
from the signal handler */
2607
1546
/* Initialize the pseudo-RNG for Avahi */
2608
1547
srand((unsigned int) time(NULL));
2609
simple_poll = avahi_simple_poll_new();
2610
if(simple_poll == NULL){
2611
fprintf_plus(stderr,
2612
"Avahi: Failed to create simple poll object.\n");
1548
mc.simple_poll = avahi_simple_poll_new();
1549
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2613
1551
exitcode = EX_UNAVAILABLE;
2614
1552
goto end;
2615
1553
}
2677
1615
}
2678
1616
}
2679
1617
2680
/* If no interfaces were specified, make a list */
2681
if(mc.interfaces == NULL){
2682
struct dirent **direntries = NULL;
2683
/* Look for any good interfaces */
2684
ret = scandir(sys_class_net, &direntries, good_interface,
2685
alphasort);
2686
if(ret >= 1){
2687
/* Add all found interfaces to interfaces list */
2688
for(int i = 0; i < ret; ++i){
2689
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2690
direntries[i]->d_name);
2691
if(ret_errno != 0){
2692
errno = ret_errno;
2693
perror_plus("argz_add");
2694
free(direntries[i]);
2695
continue;
2696
}
2697
if(debug){
2698
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2699
direntries[i]->d_name);
2700
}
2701
free(direntries[i]);
2702
}
2703
free(direntries);
1618
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1624
goto end;
1625
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
/* Re-raise priviliges */
1632
errno = 0;
1633
ret = seteuid(0);
1634
if(ret == -1){
1635
perror_plus("seteuid");
1636
}
1637
1638
#ifdef __linux__
1639
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
1641
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
1643
if(ret == -1){
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
1646
}
1647
#endif /* __linux__ */
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1653
#ifdef __linux__
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1656
if(ret == -1){
1657
perror_plus("klogctl");
1658
}
1659
}
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1662
errno = 0;
1663
ret = seteuid(uid);
1664
if(ret == -1){
1665
perror_plus("seteuid");
1666
}
1667
goto end;
1668
}
1669
strcpy(network.ifr_name, interface);
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1671
if(ret == -1){
1672
perror_plus("ioctl SIOCGIFFLAGS");
1673
#ifdef __linux__
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1676
if(ret == -1){
1677
perror_plus("klogctl");
1678
}
1679
}
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1683
errno = 0;
1684
ret = seteuid(uid);
1685
if(ret == -1){
1686
perror_plus("seteuid");
1687
}
1688
goto end;
1689
}
1690
if((network.ifr_flags & IFF_UP) == 0){
1691
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1694
if(ret == -1){
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1698
#ifdef __linux__
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1701
if(ret == -1){
1702
perror_plus("klogctl");
1703
}
1704
}
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1707
errno = 0;
1708
ret = seteuid(uid);
1709
if(ret == -1){
1710
perror_plus("seteuid");
1711
}
1712
goto end;
1713
}
1714
}
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1719
if(ret == -1){
1720
perror_plus("ioctl SIOCGIFFLAGS");
1721
} else if(network.ifr_flags & IFF_RUNNING){
1722
break;
1723
}
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
ret = nanosleep(&sleeptime, NULL);
1726
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1728
}
1729
}
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
if(ret == -1){
1734
perror_plus("close");
1735
}
1736
}
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1741
if(ret == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1747
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
2704
1754
} else {
2705
if(ret == 0){
2706
free(direntries);
2707
}
2708
fprintf_plus(stderr, "Could not find a network interface\n");
2709
exitcode = EXIT_FAILURE;
2710
goto end;
2711
}
2712
}
2713
2714
/* Bring up interfaces which are down, and remove any "none"s */
2715
{
2716
char *interface = NULL;
2717
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2718
interface))){
2719
/* If interface name is "none", stop bringing up interfaces.
2720
Also remove all instances of "none" from the list */
2721
if(strcmp(interface, "none") == 0){
2722
argz_delete(&mc.interfaces, &mc.interfaces_size,
2723
interface);
2724
interface = NULL;
2725
while((interface = argz_next(mc.interfaces,
2726
mc.interfaces_size, interface))){
2727
if(strcmp(interface, "none") == 0){
2728
argz_delete(&mc.interfaces, &mc.interfaces_size,
2729
interface);
2730
interface = NULL;
2731
}
2732
}
2733
break;
2734
}
2735
bool interface_was_up = interface_is_up(interface);
2736
errno = bring_up_interface(interface, delay);
2737
if(not interface_was_up){
2738
if(errno != 0){
2739
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2740
" %s\n", interface, strerror(errno));
2741
} else {
2742
errno = argz_add(&interfaces_to_take_down,
2743
&interfaces_to_take_down_size,
2744
interface);
2745
if(errno != 0){
2746
perror_plus("argz_add");
2747
}
2748
}
2749
}
2750
}
2751
if(debug and (interfaces_to_take_down == NULL)){
2752
fprintf_plus(stderr, "No interfaces were brought up\n");
2753
}
2754
}
2755
2756
/* If we only got one interface, explicitly use only that one */
2757
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2758
if(debug){
2759
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2760
mc.interfaces);
2761
}
2762
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
1760
}
2763
1761
}
2764
1762
2765
1763
if(quit_now){
2766
1764
goto end;
2767
1765
}
2768
1766
2769
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1767
ret = init_gnutls_global(pubkey, seckey);
2770
1768
if(ret == -1){
2771
fprintf_plus(stderr, "init_gnutls_global failed\n");
1769
fprintf(stderr, "init_gnutls_global failed\n");
2772
1770
exitcode = EX_UNAVAILABLE;
2773
1771
goto end;
2774
1772
} else {
2779
1777
goto end;
2780
1778
}
2781
1779
2782
/* Try /run/tmp before /tmp */
2783
tempdir = mkdtemp(run_tempdir);
2784
if(tempdir == NULL and errno == ENOENT){
2785
if(debug){
2786
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2787
run_tempdir, old_tempdir);
2788
}
2789
tempdir = mkdtemp(old_tempdir);
2790
}
2791
if(tempdir == NULL){
1780
if(mkdtemp(tempdir) == NULL){
2792
1781
perror_plus("mkdtemp");
2793
1782
goto end;
2794
1783
}
1784
tempdir_created = true;
2795
1785
2796
1786
if(quit_now){
2797
1787
goto end;
2798
1788
}
2799
1789
2800
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2801
fprintf_plus(stderr, "init_gpgme failed\n");
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2802
1792
exitcode = EX_UNAVAILABLE;
2803
1793
goto end;
2804
1794
} else {
2813
1803
/* Connect directly, do not use Zeroconf */
2814
1804
/* (Mainly meant for debugging) */
2815
1805
char *address = strrchr(connect_to, ':');
2816
2817
1806
if(address == NULL){
2818
fprintf_plus(stderr, "No colon in address\n");
1807
fprintf(stderr, "No colon in address\n");
2819
1808
exitcode = EX_USAGE;
2820
1809
goto end;
2821
1810
}
2824
1813
goto end;
2825
1814
}
2826
1815
2827
in_port_t port;
1816
uint16_t port;
2828
1817
errno = 0;
2829
1818
tmpmax = strtoimax(address+1, &tmp, 10);
2830
1819
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2831
or tmpmax != (in_port_t)tmpmax){
2832
fprintf_plus(stderr, "Bad port number\n");
1820
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2833
1822
exitcode = EX_USAGE;
2834
1823
goto end;
2835
1824
}
2836
1825
2837
1826
if(quit_now){
2838
1827
goto end;
2839
1828
}
2840
1829
2841
port = (in_port_t)tmpmax;
1830
port = (uint16_t)tmpmax;
2842
1831
*address = '\0';
1832
address = connect_to;
2843
1833
/* Colon in address indicates IPv6 */
2844
1834
int af;
2845
if(strchr(connect_to, ':') != NULL){
1835
if(strchr(address, ':') != NULL){
2846
1836
af = AF_INET6;
2847
/* Accept [] around IPv6 address - see RFC 5952 */
2848
if(connect_to[0] == '[' and address[-1] == ']')
2849
{
2850
connect_to++;
2851
address[-1] = '\0';
2852
}
2853
1837
} else {
2854
1838
af = AF_INET;
2855
1839
}
2856
address = connect_to;
2857
1840
2858
1841
if(quit_now){
2859
1842
goto end;
2860
1843
}
2861
1844
2862
1845
while(not quit_now){
2863
ret = start_mandos_communication(address, port, if_index, af,
2864
&mc);
1846
ret = start_mandos_communication(address, port, if_index, af);
2865
1847
if(quit_now or ret == 0){
2866
1848
break;
2867
1849
}
2868
if(debug){
2869
fprintf_plus(stderr, "Retrying in %d seconds\n",
2870
(int)retry_interval);
2871
}
2872
sleep((unsigned int)retry_interval);
2873
}
2874
2875
if(not quit_now){
1850
sleep((int)retry_interval or 1);
1851
};
1852
1853
if (not quit_now){
2876
1854
exitcode = EXIT_SUCCESS;
2877
1855
}
2878
1856
2879
1857
goto end;
2880
1858
}
2881
1859
2893
1871
config.publish_domain = 0;
2894
1872
2895
1873
/* Allocate a new server */
2896
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2897
&config, NULL, NULL, &ret_errno);
1874
mc.server = avahi_server_new(avahi_simple_poll_get
1875
(mc.simple_poll), &config, NULL,
1876
NULL, &error);
2898
1877
2899
1878
/* Free the Avahi configuration data */
2900
1879
avahi_server_config_free(&config);
2902
1881
2903
1882
/* Check if creating the Avahi server object succeeded */
2904
1883
if(mc.server == NULL){
2905
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2906
avahi_strerror(ret_errno));
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2907
1886
exitcode = EX_UNAVAILABLE;
2908
1887
goto end;
2909
1888
}
2915
1894
/* Create the Avahi service browser */
2916
1895
sb = avahi_s_service_browser_new(mc.server, if_index,
2917
1896
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2918
NULL, 0, browse_callback,
2919
(void *)&mc);
1897
NULL, 0, browse_callback, NULL);
2920
1898
if(sb == NULL){
2921
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2922
avahi_strerror(avahi_server_errno(mc.server)));
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2923
1901
exitcode = EX_UNAVAILABLE;
2924
1902
goto end;
2925
1903
}
2931
1909
/* Run the main loop */
2932
1910
2933
1911
if(debug){
2934
fprintf_plus(stderr, "Starting Avahi loop search\n");
1912
fprintf(stderr, "Starting Avahi loop search\n");
2935
1913
}
2936
2937
ret = avahi_loop_with_timeout(simple_poll,
2938
(int)(retry_interval * 1000), &mc);
1914
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
2939
1917
if(debug){
2940
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2941
(ret == 0) ? "successfully" : "with error");
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2942
1920
}
2943
1921
2944
1922
end:
2945
1923
2946
1924
if(debug){
2947
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2948
1926
}
2949
1927
2950
1928
/* Cleanup things */
2951
free(mc.interfaces);
2952
2953
1929
if(sb != NULL)
2954
1930
avahi_s_service_browser_free(sb);
2955
1931
2956
1932
if(mc.server != NULL)
2957
1933
avahi_server_free(mc.server);
2958
1934
2959
if(simple_poll != NULL)
2960
avahi_simple_poll_free(simple_poll);
1935
if(mc.simple_poll != NULL)
1936
avahi_simple_poll_free(mc.simple_poll);
2961
1937
2962
1938
if(gnutls_initialized){
2963
1939
gnutls_certificate_free_credentials(mc.cred);
1940
gnutls_global_deinit();
2964
1941
gnutls_dh_params_deinit(mc.dh_params);
2965
1942
}
2966
1943
2967
1944
if(gpgme_initialized){
2968
1945
gpgme_release(mc.ctx);
2969
1946
}
2970
1947
2971
1948
/* Cleans up the circular linked list of Mandos servers the client
2972
1949
has seen */
2973
1950
if(mc.current_server != NULL){
2974
1951
mc.current_server->prev->next = NULL;
2975
1952
while(mc.current_server != NULL){
2976
1953
server *next = mc.current_server->next;
2977
#ifdef __GNUC__
2978
#pragma GCC diagnostic push
2979
#pragma GCC diagnostic ignored "-Wcast-qual"
2980
#endif
2981
free((char *)(mc.current_server->ip));
2982
#ifdef __GNUC__
2983
#pragma GCC diagnostic pop
2984
#endif
2985
1954
free(mc.current_server);
2986
1955
mc.current_server = next;
2987
1956
}
2988
1957
}
2989
1958
2990
/* Re-raise privileges */
2991
{
2992
ret_errno = raise_privileges();
2993
if(ret_errno != 0){
2994
errno = ret_errno;
2995
perror_plus("Failed to raise privileges");
2996
} else {
2997
2998
/* Run network hooks */
2999
run_network_hooks("stop", interfaces_hooks != NULL ?
3000
interfaces_hooks : "", delay);
3001
3002
/* Take down the network interfaces which were brought up */
3003
{
3004
char *interface = NULL;
3005
while((interface=argz_next(interfaces_to_take_down,
3006
interfaces_to_take_down_size,
3007
interface))){
3008
ret_errno = take_down_interface(interface);
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3011
perror_plus("Failed to take down interface");
3012
}
3013
}
3014
if(debug and (interfaces_to_take_down == NULL)){
3015
fprintf_plus(stderr, "No interfaces needed to be taken"
3016
" down\n");
3017
}
3018
}
3019
}
3020
3021
ret_errno = lower_privileges_permanently();
3022
if(ret_errno != 0){
3023
errno = ret_errno;
3024
perror_plus("Failed to lower privileges permanently");
3025
}
3026
}
3027
3028
free(interfaces_to_take_down);
3029
free(interfaces_hooks);
3030
3031
void clean_dir_at(int base, const char * const dirname,
3032
uintmax_t level){
3033
struct dirent **direntries = NULL;
3034
int dret;
3035
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3036
O_RDONLY
3037
| O_NOFOLLOW
3038
| O_DIRECTORY
3039
| O_PATH));
3040
if(dir_fd == -1){
3041
perror_plus("open");
3042
}
3043
int numentries = scandirat(dir_fd, ".", &direntries,
3044
notdotentries, alphasort);
3045
if(numentries >= 0){
3046
for(int i = 0; i < numentries; i++){
3047
if(debug){
3048
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3049
dirname, direntries[i]->d_name);
3050
}
3051
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3052
if(dret == -1){
3053
if(errno == EISDIR){
3054
dret = unlinkat(dir_fd, direntries[i]->d_name,
3055
AT_REMOVEDIR);
3056
}
3057
if((dret == -1) and (errno == ENOTEMPTY)
3058
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3059
== 0) and (level == 0)){
3060
/* Recurse only in this special case */
3061
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3062
dret = 0;
3063
}
3064
if(dret == -1){
3065
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3066
direntries[i]->d_name, strerror(errno));
3067
}
3068
}
3069
free(direntries[i]);
3070
}
3071
3072
/* need to clean even if 0 because man page doesn't specify */
3073
free(direntries);
3074
if(numentries == -1){
3075
perror_plus("scandirat");
3076
}
3077
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3078
if(dret == -1 and errno != ENOENT){
3079
perror_plus("rmdir");
3080
}
3081
} else {
3082
perror_plus("scandirat");
3083
}
3084
close(dir_fd);
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1962
errno = 0;
1963
ret = seteuid(0);
1964
if(ret == -1){
1965
perror_plus("seteuid");
1966
}
1967
if(geteuid() == 0){
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1976
}
1977
}
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
1987
}
1988
}
3085
1989
}
3086
1990
3087
1991
/* Removes the GPGME temp directory and all files inside */
3088
if(tempdir != NULL){
3089
clean_dir_at(-1, tempdir, 0);
1992
if(tempdir_created){
1993
struct dirent **direntries = NULL;
1994
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
1998
direntry = direntries[i];
1999
char *fullname = NULL;
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
2001
direntry->d_name);
2002
if(ret < 0){
2003
perror_plus("asprintf");
2004
continue;
2005
}
2006
ret = remove(fullname);
2007
if(ret == -1){
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2010
}
2011
free(fullname);
2012
}
2013
}
2014
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2017
free(direntries);
2018
if (ret == -1){
2019
perror_plus("scandir");
2020
}
2021
ret = rmdir(tempdir);
2022
if(ret == -1 and errno != ENOENT){
2023
perror_plus("rmdir");
2024
}
3090
2025
}
3091
2026
3092
2027
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0