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- Committer: Teddy Hogeborn
- Date: 2016-02-21 14:24:01 UTC
- Revision ID: teddy@recompile.se-20160221142401-j7glu6a2hg604d1e
Use AddressSanitizer and UndefinedBehaviorSanitizer.
* Makefile (SANITIZE): New; set to all sanitizing options depending on
GCC version.
(CFLAGS): Added "$(SANITIZE)".
* Makefile (SANITIZE): New; set to all sanitizing options depending on
GCC version.
(CFLAGS): Added "$(SANITIZE)".
- files added:
- DBUS-API
- debian/source
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.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
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
77
79
#include <iso646.h> /* not, or, and */
78
80
#include <argp.h> /* struct argp_option, error_t, struct
79
81
argp_state, struct argp,
84
86
raise() */
85
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
87
98
88
99
#ifdef __linux__
89
100
#include <sys/klog.h> /* klogctl() */
107
118
init_gnutls_session(),
108
119
GNUTLS_* */
109
120
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
112
123
113
124
/* GPGME */
114
125
#include <gpgme.h> /* All GPGME types, constants and
122
133
#define PATHDIR "/conf/conf.d/mandos"
123
134
#define SECKEY "seckey.txt"
124
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
137
126
138
bool debug = false;
127
139
static const char mandos_protocol_version[] = "1";
128
140
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
130
159
131
160
/* Used for passing in values through the Avahi callback functions */
132
161
typedef struct {
133
AvahiSimplePoll *simple_poll;
134
162
AvahiServer *server;
135
163
gnutls_certificate_credentials_t cred;
136
164
unsigned int dh_bits;
137
165
gnutls_dh_params_t dh_params;
138
166
const char *priority;
139
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
140
171
} mandos_context;
141
172
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
146
175
147
176
sig_atomic_t quit_now = 0;
148
177
int signal_received = 0;
149
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
150
198
/*
151
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
200
* bytes. "buffer_capacity" is how much is currently allocated,
153
201
* "buffer_length" is how much is already used.
154
202
*/
203
__attribute__((nonnull, warn_unused_result))
155
204
size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
205
size_t buffer_capacity){
157
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
160
213
return 0;
161
214
}
215
*buffer = new_buf;
162
216
buffer_capacity += BUFFER_SIZE;
163
217
}
164
218
return buffer_capacity;
165
219
}
166
220
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
167
269
/*
168
270
* Initialize GPGME.
169
271
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
172
277
gpgme_error_t rc;
173
278
gpgme_engine_info_t engine_info;
174
279
175
176
280
/*
177
281
* Helper function to insert pub and seckey to the engine keyring.
178
282
*/
179
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
180
284
int ret;
181
285
int fd;
182
286
gpgme_data_t pgp_data;
183
287
184
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
289
if(fd == -1){
186
perror("open");
290
perror_plus("open");
187
291
return false;
188
292
}
189
293
190
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
295
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
194
298
return false;
195
299
}
196
300
197
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
198
302
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
201
305
return false;
202
306
}
203
307
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
308
ret = close(fd);
205
309
if(ret == -1){
206
perror("close");
310
perror_plus("close");
207
311
}
208
312
gpgme_data_release(pgp_data);
209
313
return true;
210
314
}
211
315
212
316
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
214
318
}
215
319
216
320
/* Init GPGME */
217
321
gpgme_check_version(NULL);
218
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
323
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
222
326
return false;
223
327
}
224
328
225
/* Set GPGME home directory for the OpenPGP engine only */
329
/* Set GPGME home directory for the OpenPGP engine only */
226
330
rc = gpgme_get_engine_info(&engine_info);
227
331
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
230
334
return false;
231
335
}
232
336
while(engine_info != NULL){
238
342
engine_info = engine_info->next;
239
343
}
240
344
if(engine_info == NULL){
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
242
347
return false;
243
348
}
244
349
245
350
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
247
352
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
250
356
return false;
251
357
}
252
358
261
367
* Decrypt OpenPGP data.
262
368
* Returns -1 on error
263
369
*/
370
__attribute__((nonnull, warn_unused_result))
264
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
265
372
size_t crypto_size,
266
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
267
375
gpgme_data_t dh_crypto, dh_plain;
268
376
gpgme_error_t rc;
269
377
ssize_t ret;
271
379
ssize_t plaintext_length = 0;
272
380
273
381
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
275
383
}
276
384
277
385
/* Create new GPGME data buffer from memory cryptotext */
278
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
387
0);
280
388
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
283
391
return -1;
284
392
}
285
393
286
394
/* Create new empty GPGME data buffer for the plaintext */
287
395
rc = gpgme_data_new(&dh_plain);
288
396
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
291
400
gpgme_data_release(dh_crypto);
292
401
return -1;
293
402
}
294
403
295
404
/* Decrypt data from the cryptotext data buffer to the plaintext
296
405
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
298
407
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
301
410
plaintext_length = -1;
302
411
if(debug){
303
412
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
305
414
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
416
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
312
421
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
423
}
315
424
gpgme_recipient_t recipient;
316
425
recipient = result->recipients;
317
426
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
324
434
recipient = recipient->next;
325
435
}
326
436
}
329
439
}
330
440
331
441
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
333
443
}
334
444
335
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
447
perror_plus("gpgme_data_seek");
338
448
plaintext_length = -1;
339
449
goto decrypt_end;
340
450
}
342
452
*plaintext = NULL;
343
453
while(true){
344
454
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
347
457
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
351
461
}
352
462
353
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
468
break;
359
469
}
360
470
if(ret < 0){
361
perror("gpgme_data_read");
471
perror_plus("gpgme_data_read");
362
472
plaintext_length = -1;
363
473
goto decrypt_end;
364
474
}
366
476
}
367
477
368
478
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
370
480
for(ssize_t i = 0; i < plaintext_length; i++){
371
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
482
}
383
493
return plaintext_length;
384
494
}
385
495
386
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
389
if(ret == NULL)
390
ret = "(unknown)";
391
return ret;
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
392
507
}
393
508
394
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
395
511
static void debuggnutls(__attribute__((unused)) int level,
396
512
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
513
fprintf_plus(stderr, "GnuTLS: %s", string);
398
514
}
399
515
516
__attribute__((nonnull, warn_unused_result))
400
517
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
402
521
int ret;
522
unsigned int uret;
403
523
404
524
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
406
526
}
407
527
408
528
ret = gnutls_global_init();
409
529
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
412
532
return -1;
413
533
}
414
534
421
541
}
422
542
423
543
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
425
545
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
431
548
gnutls_global_deinit();
432
549
return -1;
433
550
}
434
551
435
552
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
439
557
}
440
558
441
559
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
443
561
GNUTLS_OPENPGP_FMT_BASE64);
444
562
if(ret != GNUTLS_E_SUCCESS){
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
563
fprintf_plus(stderr,
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
450
568
goto globalfail;
451
569
}
452
570
453
571
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
455
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
458
goto globalfail;
459
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
464
goto globalfail;
465
}
466
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
572
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
577
goto globalfail;
578
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
468
752
469
753
return 0;
470
754
471
755
globalfail:
472
756
473
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
474
758
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
476
760
return -1;
477
761
}
478
762
479
static int init_gnutls_session(gnutls_session_t *session){
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
480
766
int ret;
481
767
/* GnuTLS session creation */
482
768
do {
486
772
}
487
773
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
774
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
775
fprintf_plus(stderr,
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
491
778
}
492
779
493
780
{
494
781
const char *err;
495
782
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
497
784
if(quit_now){
498
785
gnutls_deinit(*session);
499
786
return -1;
500
787
}
501
788
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
789
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
790
fprintf_plus(stderr, "Syntax error at: %s\n", err);
791
fprintf_plus(stderr, "GnuTLS error: %s\n",
792
safer_gnutls_strerror(ret));
506
793
gnutls_deinit(*session);
507
794
return -1;
508
795
}
510
797
511
798
do {
512
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
800
mc->cred);
514
801
if(quit_now){
515
802
gnutls_deinit(*session);
516
803
return -1;
517
804
}
518
805
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
806
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
522
809
gnutls_deinit(*session);
523
810
return -1;
524
811
}
526
813
/* ignore client certificate if any. */
527
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
528
815
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
530
531
816
return 0;
532
817
}
533
818
535
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
536
821
__attribute__((unused)) const char *txt){}
537
822
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = close(devnull);
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
close(helperdir_fd);
958
_exit(EX_UNAVAILABLE);
959
}
960
close(helperdir_fd);
961
#ifdef __GNUC__
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
964
#endif
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
968
environ) == -1){
969
#ifdef __GNUC__
970
#pragma GCC diagnostic pop
971
#endif
972
perror_plus("fexecve");
973
_exit(EXIT_FAILURE);
974
}
975
}
976
if(pid == -1){
977
perror_plus("fork");
978
return false;
979
}
980
int status;
981
pid_t pret = -1;
982
errno = 0;
983
do {
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
991
}
992
if(kill(pid, SIGTERM) == -1){
993
perror_plus("kill");
994
}
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
997
" helper program");
998
}
999
return false;
1000
}
1001
} while(pret == -1 and errno == EINTR);
1002
if(pret == -1){
1003
perror_plus("waitpid");
1004
return false;
1005
}
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1010
return false;
1011
}
1012
return true;
1013
}
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1017
return false;
1018
}
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1020
return false;
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
}
1029
return add_delete_local_route(true, address, if_index);
1030
}
1031
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1035
if(debug){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
}
1038
return add_delete_local_route(false, address, if_index);
1039
}
1040
538
1041
/* Called when a Mandos server is found */
539
static int start_mandos_communication(const char *ip, uint16_t port,
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
540
1044
AvahiIfIndex if_index,
541
int af){
1045
int af, mandos_context *mc){
542
1046
int ret, tcp_sd = -1;
543
1047
ssize_t sret;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
1048
struct sockaddr_storage to;
548
1049
char *buffer = NULL;
549
1050
char *decrypted_buffer = NULL;
550
1051
size_t buffer_length = 0;
553
1054
int retval = -1;
554
1055
gnutls_session_t session;
555
1056
int pf; /* Protocol family */
1057
bool route_added = false;
556
1058
557
1059
errno = 0;
558
1060
569
1071
pf = PF_INET;
570
1072
break;
571
1073
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
1074
fprintf_plus(stderr, "Bad address family: %d\n", af);
573
1075
errno = EINVAL;
574
1076
return -1;
575
1077
}
576
1078
577
ret = init_gnutls_session(&session);
1079
/* If the interface is specified and we have a list of interfaces */
1080
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1081
/* Check if the interface is one of the interfaces we are using */
1082
bool match = false;
1083
{
1084
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
1107
return -1;
1108
}
1109
}
1110
1111
ret = init_gnutls_session(&session, mc);
578
1112
if(ret != 0){
579
1113
return -1;
580
1114
}
581
1115
582
1116
if(debug){
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
585
1119
}
586
1120
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
588
1122
if(tcp_sd < 0){
589
1123
int e = errno;
590
perror("socket");
1124
perror_plus("socket");
591
1125
errno = e;
592
1126
goto mandos_end;
593
1127
}
597
1131
goto mandos_end;
598
1132
}
599
1133
600
memset(&to, 0, sizeof(to));
601
1134
if(af == AF_INET6){
602
to.in6.sin6_family = (sa_family_t)af;
603
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
604
1138
} else { /* IPv4 */
605
to.in.sin_family = (sa_family_t)af;
606
ret = inet_pton(af, ip, &to.in.sin_addr);
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
607
1142
}
608
1143
if(ret < 0 ){
609
1144
int e = errno;
610
perror("inet_pton");
1145
perror_plus("inet_pton");
611
1146
errno = e;
612
1147
goto mandos_end;
613
1148
}
614
1149
if(ret == 0){
615
1150
int e = errno;
616
fprintf(stderr, "Bad address: %s\n", ip);
1151
fprintf_plus(stderr, "Bad address: %s\n", ip);
617
1152
errno = e;
618
1153
goto mandos_end;
619
1154
}
620
1155
if(af == AF_INET6){
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
628
1159
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
" incomplete without a network interface\n");
631
1162
errno = EINVAL;
632
1163
goto mandos_end;
633
1164
}
634
1165
/* Set the network interface number as scope */
635
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
636
1167
}
637
1168
} else {
638
to.in.sin_port = htons(port); /* Spurious warnings from
639
-Wconversion and
640
-Wunreachable-code */
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
641
1170
}
642
1171
643
1172
if(quit_now){
649
1178
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
1179
char interface[IF_NAMESIZE];
651
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
1181
perror_plus("if_indextoname");
653
1182
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
656
1185
}
657
1186
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
660
1189
}
661
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
663
const char *pcret;
664
if(af == AF_INET6){
665
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
666
sizeof(addrstr));
667
} else {
668
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
669
sizeof(addrstr));
670
}
671
if(pcret == NULL){
672
perror("inet_ntop");
673
} else {
674
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
676
}
677
}
678
}
679
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
683
}
684
685
if(af == AF_INET6){
686
ret = connect(tcp_sd, &to.in6, sizeof(to));
687
} else {
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
}
690
if(ret < 0){
691
int e = errno;
692
perror("connect");
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
goto mandos_end;
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
700
1272
}
701
1273
702
1274
const char *out = mandos_protocol_version;
704
1276
while(true){
705
1277
size_t out_size = strlen(out);
706
1278
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
out_size - written));
1279
out_size - written));
708
1280
if(ret == -1){
709
1281
int e = errno;
710
perror("write");
1282
perror_plus("write");
711
1283
errno = e;
712
1284
goto mandos_end;
713
1285
}
730
1302
}
731
1303
732
1304
if(debug){
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1305
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
734
1306
}
735
1307
736
1308
if(quit_now){
738
1310
goto mandos_end;
739
1311
}
740
1312
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
742
1318
743
1319
if(quit_now){
744
1320
errno = EINTR;
755
1331
756
1332
if(ret != GNUTLS_E_SUCCESS){
757
1333
if(debug){
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1334
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
759
1335
gnutls_perror(ret);
760
1336
}
761
1337
errno = EPROTO;
765
1341
/* Read OpenPGP packet that contains the wanted password */
766
1342
767
1343
if(debug){
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
1344
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1345
" %s\n", ip);
770
1346
}
771
1347
772
1348
while(true){
777
1353
}
778
1354
779
1355
buffer_capacity = incbuffer(&buffer, buffer_length,
780
buffer_capacity);
1356
buffer_capacity);
781
1357
if(buffer_capacity == 0){
782
1358
int e = errno;
783
perror("incbuffer");
1359
perror_plus("incbuffer");
784
1360
errno = e;
785
1361
goto mandos_end;
786
1362
}
810
1386
}
811
1387
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
1388
if(ret < 0){
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1389
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1390
"***\n");
814
1391
gnutls_perror(ret);
815
1392
errno = EPROTO;
816
1393
goto mandos_end;
817
1394
}
818
1395
break;
819
1396
default:
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
1397
fprintf_plus(stderr, "Unknown error while reading data from"
1398
" encrypted session with Mandos server\n");
822
1399
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
1400
errno = EIO;
824
1401
goto mandos_end;
829
1406
}
830
1407
831
1408
if(debug){
832
fprintf(stderr, "Closing TLS session\n");
1409
fprintf_plus(stderr, "Closing TLS session\n");
833
1410
}
834
1411
835
1412
if(quit_now){
847
1424
848
1425
if(buffer_length > 0){
849
1426
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
852
&decrypted_buffer);
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
853
1429
if(decrypted_buffer_size >= 0){
854
1430
855
1431
written = 0;
865
1441
if(ret == 0 and ferror(stdout)){
866
1442
int e = errno;
867
1443
if(debug){
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
1444
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1445
strerror(errno));
870
1446
}
871
1447
errno = e;
872
1448
goto mandos_end;
881
1457
882
1458
mandos_end:
883
1459
{
1460
if(route_added){
1461
if(not delete_local_route(ip, if_index)){
1462
fprintf_plus(stderr, "Failed to delete local route to %s on"
1463
" interface %d", ip, if_index);
1464
}
1465
}
884
1466
int e = errno;
885
1467
free(decrypted_buffer);
886
1468
free(buffer);
887
1469
if(tcp_sd >= 0){
888
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1470
ret = close(tcp_sd);
889
1471
}
890
1472
if(ret == -1){
891
1473
if(e == 0){
892
1474
e = errno;
893
1475
}
894
perror("close");
1476
perror_plus("close");
895
1477
}
896
1478
gnutls_deinit(session);
1479
errno = e;
897
1480
if(quit_now){
898
e = EINTR;
1481
errno = EINTR;
899
1482
retval = -1;
900
1483
}
901
errno = e;
902
1484
}
903
1485
return retval;
904
1486
}
905
1487
1488
__attribute__((nonnull))
906
1489
static void resolve_callback(AvahiSServiceResolver *r,
907
1490
AvahiIfIndex interface,
908
1491
AvahiProtocol proto,
916
1499
AVAHI_GCC_UNUSED AvahiStringList *txt,
917
1500
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
1501
flags,
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(r);
1502
void *mc){
1503
if(r == NULL){
1504
return;
1505
}
921
1506
922
1507
/* Called whenever a service has been resolved successfully or
923
1508
timed out */
924
1509
925
1510
if(quit_now){
1511
avahi_s_service_resolver_free(r);
926
1512
return;
927
1513
}
928
1514
929
1515
switch(event){
930
1516
default:
931
1517
case AVAHI_RESOLVER_FAILURE:
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
avahi_strerror(avahi_server_errno(mc.server)));
1518
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1519
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1520
domain,
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
935
1523
break;
936
1524
937
1525
case AVAHI_RESOLVER_FOUND:
939
1527
char ip[AVAHI_ADDRESS_STR_MAX];
940
1528
avahi_address_snprint(ip, sizeof(ip), address);
941
1529
if(debug){
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
1530
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1531
PRIdMAX ") on port %" PRIu16 "\n", name,
1532
host_name, ip, (intmax_t)interface, port);
945
1533
}
946
int ret = start_mandos_communication(ip, port, interface,
947
avahi_proto_to_af(proto));
1534
int ret = start_mandos_communication(ip, (in_port_t)port,
1535
interface,
1536
avahi_proto_to_af(proto),
1537
mc);
948
1538
if(ret == 0){
949
avahi_simple_poll_quit(mc.simple_poll);
1539
avahi_simple_poll_quit(simple_poll);
1540
} else {
1541
if(not add_server(ip, (in_port_t)port, interface,
1542
avahi_proto_to_af(proto),
1543
&((mandos_context*)mc)->current_server)){
1544
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1545
" list\n", name);
1546
}
950
1547
}
951
1548
}
952
1549
}
962
1559
const char *domain,
963
1560
AVAHI_GCC_UNUSED AvahiLookupResultFlags
964
1561
flags,
965
AVAHI_GCC_UNUSED void* userdata){
966
assert(b);
1562
void *mc){
1563
if(b == NULL){
1564
return;
1565
}
967
1566
968
1567
/* Called whenever a new services becomes available on the LAN or
969
1568
is removed from the LAN */
976
1575
default:
977
1576
case AVAHI_BROWSER_FAILURE:
978
1577
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
1578
fprintf_plus(stderr, "(Avahi browser) %s\n",
1579
avahi_strerror(avahi_server_errno
1580
(((mandos_context*)mc)->server)));
1581
avahi_simple_poll_quit(simple_poll);
982
1582
return;
983
1583
984
1584
case AVAHI_BROWSER_NEW:
987
1587
the callback function is called the Avahi server will free the
988
1588
resolver for us. */
989
1589
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
name, avahi_strerror(avahi_server_errno(mc.server)));
1590
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1591
interface, protocol, name, type,
1592
domain, protocol, 0,
1593
resolve_callback, mc) == NULL)
1594
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1595
" %s\n", name,
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
995
1598
break;
996
1599
997
1600
case AVAHI_BROWSER_REMOVE:
1000
1603
case AVAHI_BROWSER_ALL_FOR_NOW:
1001
1604
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1002
1605
if(debug){
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1606
fprintf_plus(stderr, "No Mandos server found, still"
1607
" searching...\n");
1004
1608
}
1005
1609
break;
1006
1610
}
1007
1611
}
1008
1612
1009
/* stop main loop after sigterm has been called */
1613
/* Signal handler that stops main loop after SIGTERM */
1010
1614
static void handle_sigterm(int sig){
1011
1615
if(quit_now){
1012
1616
return;
1014
1618
quit_now = 1;
1015
1619
signal_received = sig;
1016
1620
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1621
/* set main loop to exit */
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1624
}
1625
errno = old_errno;
1626
}
1627
1628
__attribute__((nonnull, warn_unused_result))
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
int ret;
1631
error_t ret_errno;
1632
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1634
if(s < 0){
1635
ret_errno = errno;
1636
perror_plus("socket");
1637
errno = ret_errno;
1638
return false;
1639
}
1640
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1641
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1642
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1643
if(ret == -1){
1644
if(debug){
1645
ret_errno = errno;
1646
perror_plus("ioctl SIOCGIFFLAGS");
1647
errno = ret_errno;
1648
}
1649
return false;
1650
}
1651
return true;
1652
}
1653
1654
__attribute__((nonnull, warn_unused_result))
1655
bool good_flags(const char *ifname, const struct ifreq *ifr){
1656
1657
/* Reject the loopback device */
1658
if(ifr->ifr_flags & IFF_LOOPBACK){
1659
if(debug){
1660
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1661
ifname);
1662
}
1663
return false;
1664
}
1665
/* Accept point-to-point devices only if connect_to is specified */
1666
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1667
if(debug){
1668
fprintf_plus(stderr, "Accepting point-to-point interface"
1669
" \"%s\"\n", ifname);
1670
}
1671
return true;
1672
}
1673
/* Otherwise, reject non-broadcast-capable devices */
1674
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1675
if(debug){
1676
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1677
" \"%s\"\n", ifname);
1678
}
1679
return false;
1680
}
1681
/* Reject non-ARP interfaces (including dummy interfaces) */
1682
if(ifr->ifr_flags & IFF_NOARP){
1683
if(debug){
1684
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1685
ifname);
1686
}
1687
return false;
1688
}
1689
1690
/* Accept this device */
1691
if(debug){
1692
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1693
}
1694
return true;
1695
}
1696
1697
/*
1698
* This function determines if a directory entry in /sys/class/net
1699
* corresponds to an acceptable network device.
1700
* (This function is passed to scandir(3) as a filter function.)
1701
*/
1702
__attribute__((nonnull, warn_unused_result))
1703
int good_interface(const struct dirent *if_entry){
1704
if(if_entry->d_name[0] == '.'){
1705
return 0;
1706
}
1707
1708
struct ifreq ifr;
1709
if(not get_flags(if_entry->d_name, &ifr)){
1710
if(debug){
1711
fprintf_plus(stderr, "Failed to get flags for interface "
1712
"\"%s\"\n", if_entry->d_name);
1713
}
1714
return 0;
1715
}
1716
1717
if(not good_flags(if_entry->d_name, &ifr)){
1718
return 0;
1719
}
1720
return 1;
1721
}
1722
1723
/*
1724
* This function determines if a network interface is up.
1725
*/
1726
__attribute__((nonnull, warn_unused_result))
1727
bool interface_is_up(const char *interface){
1728
struct ifreq ifr;
1729
if(not get_flags(interface, &ifr)){
1730
if(debug){
1731
fprintf_plus(stderr, "Failed to get flags for interface "
1732
"\"%s\"\n", interface);
1733
}
1734
return false;
1735
}
1736
1737
return (bool)(ifr.ifr_flags & IFF_UP);
1738
}
1739
1740
/*
1741
* This function determines if a network interface is running
1742
*/
1743
__attribute__((nonnull, warn_unused_result))
1744
bool interface_is_running(const char *interface){
1745
struct ifreq ifr;
1746
if(not get_flags(interface, &ifr)){
1747
if(debug){
1748
fprintf_plus(stderr, "Failed to get flags for interface "
1749
"\"%s\"\n", interface);
1750
}
1751
return false;
1752
}
1753
1754
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1755
}
1756
1757
__attribute__((nonnull, pure, warn_unused_result))
1758
int notdotentries(const struct dirent *direntry){
1759
/* Skip "." and ".." */
1760
if(direntry->d_name[0] == '.'
1761
and (direntry->d_name[1] == '\0'
1762
or (direntry->d_name[1] == '.'
1763
and direntry->d_name[2] == '\0'))){
1764
return 0;
1765
}
1766
return 1;
1767
}
1768
1769
/* Is this directory entry a runnable program? */
1770
__attribute__((nonnull, warn_unused_result))
1771
int runnable_hook(const struct dirent *direntry){
1772
int ret;
1773
size_t sret;
1774
struct stat st;
1775
1776
if((direntry->d_name)[0] == '\0'){
1777
/* Empty name? */
1778
return 0;
1779
}
1780
1781
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1782
"abcdefghijklmnopqrstuvwxyz"
1783
"0123456789"
1784
"_.-");
1785
if((direntry->d_name)[sret] != '\0'){
1786
/* Contains non-allowed characters */
1787
if(debug){
1788
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1789
direntry->d_name);
1790
}
1791
return 0;
1792
}
1793
1794
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1795
if(ret == -1){
1796
if(debug){
1797
perror_plus("Could not stat hook");
1798
}
1799
return 0;
1800
}
1801
if(not (S_ISREG(st.st_mode))){
1802
/* Not a regular file */
1803
if(debug){
1804
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1805
direntry->d_name);
1806
}
1807
return 0;
1808
}
1809
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1810
/* Not executable */
1811
if(debug){
1812
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1813
direntry->d_name);
1814
}
1815
return 0;
1816
}
1817
if(debug){
1818
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1819
direntry->d_name);
1820
}
1821
return 1;
1822
}
1823
1824
__attribute__((nonnull, warn_unused_result))
1825
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1826
mandos_context *mc){
1827
int ret;
1828
struct timespec now;
1829
struct timespec waited_time;
1830
intmax_t block_time;
1831
1832
while(true){
1833
if(mc->current_server == NULL){
1834
if(debug){
1835
fprintf_plus(stderr, "Wait until first server is found."
1836
" No timeout!\n");
1837
}
1838
ret = avahi_simple_poll_iterate(s, -1);
1839
} else {
1840
if(debug){
1841
fprintf_plus(stderr, "Check current_server if we should run"
1842
" it, or wait\n");
1843
}
1844
/* the current time */
1845
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1846
if(ret == -1){
1847
perror_plus("clock_gettime");
1848
return -1;
1849
}
1850
/* Calculating in ms how long time between now and server
1851
who we visted longest time ago. Now - last seen. */
1852
waited_time.tv_sec = (now.tv_sec
1853
- mc->current_server->last_seen.tv_sec);
1854
waited_time.tv_nsec = (now.tv_nsec
1855
- mc->current_server->last_seen.tv_nsec);
1856
/* total time is 10s/10,000ms.
1857
Converting to s from ms by dividing by 1,000,
1858
and ns to ms by dividing by 1,000,000. */
1859
block_time = ((retry_interval
1860
- ((intmax_t)waited_time.tv_sec * 1000))
1861
- ((intmax_t)waited_time.tv_nsec / 1000000));
1862
1863
if(debug){
1864
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1865
block_time);
1866
}
1867
1868
if(block_time <= 0){
1869
ret = start_mandos_communication(mc->current_server->ip,
1870
mc->current_server->port,
1871
mc->current_server->if_index,
1872
mc->current_server->af, mc);
1873
if(ret == 0){
1874
avahi_simple_poll_quit(s);
1875
return 0;
1876
}
1877
ret = clock_gettime(CLOCK_MONOTONIC,
1878
&mc->current_server->last_seen);
1879
if(ret == -1){
1880
perror_plus("clock_gettime");
1881
return -1;
1882
}
1883
mc->current_server = mc->current_server->next;
1884
block_time = 0; /* Call avahi to find new Mandos
1885
servers, but don't block */
1886
}
1887
1888
ret = avahi_simple_poll_iterate(s, (int)block_time);
1889
}
1890
if(ret != 0){
1891
if(ret > 0 or errno != EINTR){
1892
return (ret != 1) ? ret : 0;
1893
}
1894
}
1895
}
1896
}
1897
1898
__attribute__((nonnull))
1899
void run_network_hooks(const char *mode, const char *interface,
1900
const float delay){
1901
struct dirent **direntries = NULL;
1902
if(hookdir_fd == -1){
1903
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1904
| O_CLOEXEC);
1905
if(hookdir_fd == -1){
1906
if(errno == ENOENT){
1907
if(debug){
1908
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1909
" found\n", hookdir);
1910
}
1911
} else {
1912
perror_plus("open");
1913
}
1914
return;
1915
}
1916
}
1917
#ifdef __GLIBC__
1918
#if __GLIBC_PREREQ(2, 15)
1919
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1920
runnable_hook, alphasort);
1921
#else /* not __GLIBC_PREREQ(2, 15) */
1922
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1923
alphasort);
1924
#endif /* not __GLIBC_PREREQ(2, 15) */
1925
#else /* not __GLIBC__ */
1926
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1927
alphasort);
1928
#endif /* not __GLIBC__ */
1929
if(numhooks == -1){
1930
perror_plus("scandir");
1931
return;
1932
}
1933
struct dirent *direntry;
1934
int ret;
1935
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1936
if(devnull == -1){
1937
perror_plus("open(\"/dev/null\", O_RDONLY)");
1938
return;
1939
}
1940
for(int i = 0; i < numhooks; i++){
1941
direntry = direntries[i];
1942
if(debug){
1943
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1944
direntry->d_name);
1945
}
1946
pid_t hook_pid = fork();
1947
if(hook_pid == 0){
1948
/* Child */
1949
/* Raise privileges */
1950
errno = raise_privileges_permanently();
1951
if(errno != 0){
1952
perror_plus("Failed to raise privileges");
1953
_exit(EX_NOPERM);
1954
}
1955
/* Set group */
1956
errno = 0;
1957
ret = setgid(0);
1958
if(ret == -1){
1959
perror_plus("setgid");
1960
_exit(EX_NOPERM);
1961
}
1962
/* Reset supplementary groups */
1963
errno = 0;
1964
ret = setgroups(0, NULL);
1965
if(ret == -1){
1966
perror_plus("setgroups");
1967
_exit(EX_NOPERM);
1968
}
1969
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
ret = setenv("DEVICE", interface, 1);
1975
if(ret == -1){
1976
perror_plus("setenv");
1977
_exit(EX_OSERR);
1978
}
1979
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1980
if(ret == -1){
1981
perror_plus("setenv");
1982
_exit(EX_OSERR);
1983
}
1984
ret = setenv("MODE", mode, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
char *delaystring;
1990
ret = asprintf(&delaystring, "%f", (double)delay);
1991
if(ret == -1){
1992
perror_plus("asprintf");
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("DELAY", delaystring, 1);
1996
if(ret == -1){
1997
free(delaystring);
1998
perror_plus("setenv");
1999
_exit(EX_OSERR);
2000
}
2001
free(delaystring);
2002
if(connect_to != NULL){
2003
ret = setenv("CONNECT", connect_to, 1);
2004
if(ret == -1){
2005
perror_plus("setenv");
2006
_exit(EX_OSERR);
2007
}
2008
}
2009
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2010
direntry->d_name,
2011
O_RDONLY));
2012
if(hook_fd == -1){
2013
perror_plus("openat");
2014
_exit(EXIT_FAILURE);
2015
}
2016
if(close(hookdir_fd) == -1){
2017
perror_plus("close");
2018
_exit(EXIT_FAILURE);
2019
}
2020
ret = dup2(devnull, STDIN_FILENO);
2021
if(ret == -1){
2022
perror_plus("dup2(devnull, STDIN_FILENO)");
2023
_exit(EX_OSERR);
2024
}
2025
ret = close(devnull);
2026
if(ret == -1){
2027
perror_plus("close");
2028
_exit(EX_OSERR);
2029
}
2030
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2031
if(ret == -1){
2032
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2033
_exit(EX_OSERR);
2034
}
2035
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2036
environ) == -1){
2037
perror_plus("fexecve");
2038
_exit(EXIT_FAILURE);
2039
}
2040
} else {
2041
if(hook_pid == -1){
2042
perror_plus("fork");
2043
free(direntry);
2044
continue;
2045
}
2046
int status;
2047
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2048
perror_plus("waitpid");
2049
free(direntry);
2050
continue;
2051
}
2052
if(WIFEXITED(status)){
2053
if(WEXITSTATUS(status) != 0){
2054
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2055
" with status %d\n", direntry->d_name,
2056
WEXITSTATUS(status));
2057
free(direntry);
2058
continue;
2059
}
2060
} else if(WIFSIGNALED(status)){
2061
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2062
" signal %d\n", direntry->d_name,
2063
WTERMSIG(status));
2064
free(direntry);
2065
continue;
2066
} else {
2067
fprintf_plus(stderr, "Warning: network hook \"%s\""
2068
" crashed\n", direntry->d_name);
2069
free(direntry);
2070
continue;
2071
}
2072
}
2073
if(debug){
2074
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2075
direntry->d_name);
2076
}
2077
free(direntry);
2078
}
2079
free(direntries);
2080
if(close(hookdir_fd) == -1){
2081
perror_plus("close");
2082
} else {
2083
hookdir_fd = -1;
2084
}
2085
close(devnull);
2086
}
2087
2088
__attribute__((nonnull, warn_unused_result))
2089
error_t bring_up_interface(const char *const interface,
2090
const float delay){
2091
error_t old_errno = errno;
2092
int ret;
2093
struct ifreq network;
2094
unsigned int if_index = if_nametoindex(interface);
2095
if(if_index == 0){
2096
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2097
errno = old_errno;
2098
return ENXIO;
2099
}
2100
2101
if(quit_now){
2102
errno = old_errno;
2103
return EINTR;
2104
}
2105
2106
if(not interface_is_up(interface)){
2107
error_t ret_errno = 0, ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
2109
ret_errno = errno;
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2111
"\"%s\"\n", interface);
2112
errno = old_errno;
2113
return ret_errno;
2114
}
2115
network.ifr_flags |= IFF_UP; /* set flag */
2116
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
2119
ret_errno = errno;
2120
perror_plus("socket");
2121
errno = old_errno;
2122
return ret_errno;
2123
}
2124
2125
if(quit_now){
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
2130
errno = old_errno;
2131
return EINTR;
2132
}
2133
2134
if(debug){
2135
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2136
interface);
2137
}
2138
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
2145
2146
#ifdef __linux__
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
2158
}
2159
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
2162
#ifdef __linux__
2163
if(restore_loglevel){
2164
ret_linux = klogctl(7, NULL, 0);
2165
if(ret_linux == -1){
2166
perror_plus("klogctl");
2167
}
2168
}
2169
#endif /* __linux__ */
2170
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
2180
2181
/* Close the socket */
2182
ret = close(sd);
2183
if(ret == -1){
2184
perror_plus("close");
2185
}
2186
2187
if(ret_setflags == -1){
2188
errno = ioctl_errno;
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2190
errno = old_errno;
2191
return ioctl_errno;
2192
}
2193
} else if(debug){
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2195
interface);
2196
}
2197
2198
/* Sleep checking until interface is running.
2199
Check every 0.25s, up to total time of delay */
2200
for(int i=0; i < delay * 4; i++){
2201
if(interface_is_running(interface)){
2202
break;
2203
}
2204
struct timespec sleeptime = { .tv_nsec = 250000000 };
2205
ret = nanosleep(&sleeptime, NULL);
2206
if(ret == -1 and errno != EINTR){
2207
perror_plus("nanosleep");
2208
}
2209
}
2210
2211
errno = old_errno;
2212
return 0;
2213
}
2214
2215
__attribute__((nonnull, warn_unused_result))
2216
error_t take_down_interface(const char *const interface){
2217
error_t old_errno = errno;
2218
struct ifreq network;
2219
unsigned int if_index = if_nametoindex(interface);
2220
if(if_index == 0){
2221
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2222
errno = old_errno;
2223
return ENXIO;
2224
}
2225
if(interface_is_up(interface)){
2226
error_t ret_errno = 0, ioctl_errno = 0;
2227
if(not get_flags(interface, &network) and debug){
2228
ret_errno = errno;
2229
fprintf_plus(stderr, "Failed to get flags for interface "
2230
"\"%s\"\n", interface);
2231
errno = old_errno;
2232
return ret_errno;
2233
}
2234
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2235
2236
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
if(sd == -1){
2238
ret_errno = errno;
2239
perror_plus("socket");
2240
errno = old_errno;
2241
return ret_errno;
2242
}
2243
2244
if(debug){
2245
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2246
interface);
2247
}
2248
2249
/* Raise privileges */
2250
ret_errno = raise_privileges();
2251
if(ret_errno != 0){
2252
errno = ret_errno;
2253
perror_plus("Failed to raise privileges");
2254
}
2255
2256
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
ioctl_errno = errno;
2258
2259
/* If raise_privileges() succeeded above */
2260
if(ret_errno == 0){
2261
/* Lower privileges */
2262
ret_errno = lower_privileges();
2263
if(ret_errno != 0){
2264
errno = ret_errno;
2265
perror_plus("Failed to lower privileges");
2266
}
2267
}
2268
2269
/* Close the socket */
2270
int ret = close(sd);
2271
if(ret == -1){
2272
perror_plus("close");
2273
}
2274
2275
if(ret_setflags == -1){
2276
errno = ioctl_errno;
2277
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2278
errno = old_errno;
2279
return ioctl_errno;
2280
}
2281
} else if(debug){
2282
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2283
interface);
2284
}
2285
2286
errno = old_errno;
2287
return 0;
1021
2288
}
1022
2289
1023
2290
int main(int argc, char *argv[]){
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
1024
2296
AvahiSServiceBrowser *sb = NULL;
1025
int error;
2297
error_t ret_errno;
1026
2298
int ret;
1027
2299
intmax_t tmpmax;
1028
2300
char *tmp;
1029
2301
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1038
bool tempdir_created = false;
2302
char *interfaces_to_take_down = NULL;
2303
size_t interfaces_to_take_down_size = 0;
2304
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2305
char old_tempdir[] = "/tmp/mandosXXXXXX";
2306
char *tempdir = NULL;
1039
2307
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1040
2308
const char *seckey = PATHDIR "/" SECKEY;
1041
2309
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
char *interfaces_hooks = NULL;
1042
2312
1043
2313
bool gnutls_initialized = false;
1044
2314
bool gpgme_initialized = false;
1045
2315
float delay = 2.5f;
2316
double retry_interval = 10; /* 10s between trying a server and
2317
retrying the same server again */
1046
2318
1047
2319
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
2320
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1054
2326
errno = 0;
1055
2327
ret = setgid(gid);
1056
2328
if(ret == -1){
1057
perror("setgid");
2329
perror_plus("setgid");
1058
2330
}
1059
2331
1060
2332
/* Lower user privileges (temporarily) */
1061
2333
errno = 0;
1062
2334
ret = seteuid(uid);
1063
2335
if(ret == -1){
1064
perror("seteuid");
2336
perror_plus("seteuid");
1065
2337
}
1066
2338
1067
2339
if(quit_now){
1094
2366
.doc = "Bit length of the prime number used in the"
1095
2367
" Diffie-Hellman key exchange",
1096
2368
.group = 2 },
2369
{ .name = "dh-params", .key = 134,
2370
.arg = "FILE",
2371
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2372
" for the Diffie-Hellman key exchange",
2373
.group = 2 },
1097
2374
{ .name = "priority", .key = 130,
1098
2375
.arg = "STRING",
1099
2376
.doc = "GnuTLS priority string for the TLS handshake",
1102
2379
.arg = "SECONDS",
1103
2380
.doc = "Maximum delay to wait for interface startup",
1104
2381
.group = 2 },
2382
{ .name = "retry", .key = 132,
2383
.arg = "SECONDS",
2384
.doc = "Retry interval used when denied by the Mandos server",
2385
.group = 2 },
2386
{ .name = "network-hook-dir", .key = 133,
2387
.arg = "DIR",
2388
.doc = "Directory where network hooks are located",
2389
.group = 2 },
1105
2390
/*
1106
2391
* These reproduce what we would get without ARGP_NO_HELP
1107
2392
*/
1125
2410
connect_to = arg;
1126
2411
break;
1127
2412
case 'i': /* --interface */
1128
interface = arg;
2413
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2414
arg, (int)',');
2415
if(ret_errno != 0){
2416
argp_error(state, "%s", strerror(ret_errno));
2417
}
1129
2418
break;
1130
2419
case 's': /* --seckey */
1131
2420
seckey = arg;
1142
2431
}
1143
2432
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1144
2433
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
1145
2437
case 130: /* --priority */
1146
2438
mc.priority = arg;
1147
2439
break;
1151
2443
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
2444
argp_error(state, "Bad delay");
1153
2445
}
2446
case 132: /* --retry */
2447
errno = 0;
2448
retry_interval = strtod(arg, &tmp);
2449
if(errno != 0 or tmp == arg or *tmp != '\0'
2450
or (retry_interval * 1000) > INT_MAX
2451
or retry_interval < 0){
2452
argp_error(state, "Bad retry interval");
2453
}
2454
break;
2455
case 133: /* --network-hook-dir */
2456
hookdir = arg;
1154
2457
break;
1155
2458
/*
1156
2459
* These reproduce what we would get without ARGP_NO_HELP
1163
2466
argp_state_help(state, state->out_stream,
1164
2467
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
2468
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
2469
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1167
2470
exit(argp_err_exit_status);
1168
2471
break;
1169
2472
default:
1184
2487
case ENOMEM:
1185
2488
default:
1186
2489
errno = ret;
1187
perror("argp_parse");
2490
perror_plus("argp_parse");
1188
2491
exitcode = EX_OSERR;
1189
2492
goto end;
1190
2493
case EINVAL:
1193
2496
}
1194
2497
}
1195
2498
2499
{
2500
/* Work around Debian bug #633582:
2501
<http://bugs.debian.org/633582> */
2502
2503
/* Re-raise privileges */
2504
ret_errno = raise_privileges();
2505
if(ret_errno != 0){
2506
errno = ret_errno;
2507
perror_plus("Failed to raise privileges");
2508
} else {
2509
struct stat st;
2510
2511
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2512
int seckey_fd = open(seckey, O_RDONLY);
2513
if(seckey_fd == -1){
2514
perror_plus("open");
2515
} else {
2516
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2517
if(ret == -1){
2518
perror_plus("fstat");
2519
} else {
2520
if(S_ISREG(st.st_mode)
2521
and st.st_uid == 0 and st.st_gid == 0){
2522
ret = fchown(seckey_fd, uid, gid);
2523
if(ret == -1){
2524
perror_plus("fchown");
2525
}
2526
}
2527
}
2528
close(seckey_fd);
2529
}
2530
}
2531
2532
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
int pubkey_fd = open(pubkey, O_RDONLY);
2534
if(pubkey_fd == -1){
2535
perror_plus("open");
2536
} else {
2537
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2538
if(ret == -1){
2539
perror_plus("fstat");
2540
} else {
2541
if(S_ISREG(st.st_mode)
2542
and st.st_uid == 0 and st.st_gid == 0){
2543
ret = fchown(pubkey_fd, uid, gid);
2544
if(ret == -1){
2545
perror_plus("fchown");
2546
}
2547
}
2548
}
2549
close(pubkey_fd);
2550
}
2551
}
2552
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2558
} else {
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
if(ret == -1){
2561
perror_plus("fstat");
2562
} else {
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2566
if(ret == -1){
2567
perror_plus("fchown");
2568
}
2569
}
2570
}
2571
close(dhparams_fd);
2572
}
2573
}
2574
2575
/* Lower privileges */
2576
ret_errno = lower_privileges();
2577
if(ret_errno != 0){
2578
errno = ret_errno;
2579
perror_plus("Failed to lower privileges");
2580
}
2581
}
2582
}
2583
2584
/* Remove invalid interface names (except "none") */
2585
{
2586
char *interface = NULL;
2587
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2588
interface))){
2589
if(strcmp(interface, "none") != 0
2590
and if_nametoindex(interface) == 0){
2591
if(interface[0] != '\0'){
2592
fprintf_plus(stderr, "Not using nonexisting interface"
2593
" \"%s\"\n", interface);
2594
}
2595
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2596
interface = NULL;
2597
}
2598
}
2599
}
2600
2601
/* Run network hooks */
2602
{
2603
if(mc.interfaces != NULL){
2604
interfaces_hooks = malloc(mc.interfaces_size);
2605
if(interfaces_hooks == NULL){
2606
perror_plus("malloc");
2607
goto end;
2608
}
2609
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2610
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2611
}
2612
run_network_hooks("start", interfaces_hooks != NULL ?
2613
interfaces_hooks : "", delay);
2614
}
2615
1196
2616
if(not debug){
1197
2617
avahi_set_log_function(empty_log);
1198
2618
}
1201
2621
from the signal handler */
1202
2622
/* Initialize the pseudo-RNG for Avahi */
1203
2623
srand((unsigned int) time(NULL));
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2624
simple_poll = avahi_simple_poll_new();
2625
if(simple_poll == NULL){
2626
fprintf_plus(stderr,
2627
"Avahi: Failed to create simple poll object.\n");
1207
2628
exitcode = EX_UNAVAILABLE;
1208
2629
goto end;
1209
2630
}
1211
2632
sigemptyset(&sigterm_action.sa_mask);
1212
2633
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
2634
if(ret == -1){
1214
perror("sigaddset");
2635
perror_plus("sigaddset");
1215
2636
exitcode = EX_OSERR;
1216
2637
goto end;
1217
2638
}
1218
2639
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
2640
if(ret == -1){
1220
perror("sigaddset");
2641
perror_plus("sigaddset");
1221
2642
exitcode = EX_OSERR;
1222
2643
goto end;
1223
2644
}
1224
2645
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
2646
if(ret == -1){
1226
perror("sigaddset");
2647
perror_plus("sigaddset");
1227
2648
exitcode = EX_OSERR;
1228
2649
goto end;
1229
2650
}
1233
2654
*/
1234
2655
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
2656
if(ret == -1){
1236
perror("sigaction");
2657
perror_plus("sigaction");
1237
2658
return EX_OSERR;
1238
2659
}
1239
2660
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
2661
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
2662
if(ret == -1){
1242
perror("sigaction");
2663
perror_plus("sigaction");
1243
2664
exitcode = EX_OSERR;
1244
2665
goto end;
1245
2666
}
1246
2667
}
1247
2668
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
2669
if(ret == -1){
1249
perror("sigaction");
2670
perror_plus("sigaction");
1250
2671
return EX_OSERR;
1251
2672
}
1252
2673
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
2674
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
2675
if(ret == -1){
1255
perror("sigaction");
2676
perror_plus("sigaction");
1256
2677
exitcode = EX_OSERR;
1257
2678
goto end;
1258
2679
}
1259
2680
}
1260
2681
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
2682
if(ret == -1){
1262
perror("sigaction");
2683
perror_plus("sigaction");
1263
2684
return EX_OSERR;
1264
2685
}
1265
2686
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
2687
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
2688
if(ret == -1){
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
1270
goto end;
1271
}
1272
}
1273
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
2689
perror_plus("sigaction");
2690
exitcode = EX_OSERR;
2691
goto end;
2692
}
2693
}
2694
2695
/* If no interfaces were specified, make a list */
2696
if(mc.interfaces == NULL){
2697
struct dirent **direntries = NULL;
2698
/* Look for any good interfaces */
2699
ret = scandir(sys_class_net, &direntries, good_interface,
2700
alphasort);
2701
if(ret >= 1){
2702
/* Add all found interfaces to interfaces list */
2703
for(int i = 0; i < ret; ++i){
2704
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2705
direntries[i]->d_name);
2706
if(ret_errno != 0){
2707
errno = ret_errno;
2708
perror_plus("argz_add");
2709
free(direntries[i]);
2710
continue;
2711
}
2712
if(debug){
2713
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2714
direntries[i]->d_name);
2715
}
2716
free(direntries[i]);
2717
}
2718
free(direntries);
2719
} else {
2720
if(ret == 0){
2721
free(direntries);
2722
}
2723
fprintf_plus(stderr, "Could not find a network interface\n");
2724
exitcode = EXIT_FAILURE;
2725
goto end;
2726
}
2727
}
2728
2729
/* Bring up interfaces which are down, and remove any "none"s */
2730
{
2731
char *interface = NULL;
2732
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2733
interface))){
2734
/* If interface name is "none", stop bringing up interfaces.
2735
Also remove all instances of "none" from the list */
2736
if(strcmp(interface, "none") == 0){
2737
argz_delete(&mc.interfaces, &mc.interfaces_size,
2738
interface);
2739
interface = NULL;
2740
while((interface = argz_next(mc.interfaces,
2741
mc.interfaces_size, interface))){
2742
if(strcmp(interface, "none") == 0){
2743
argz_delete(&mc.interfaces, &mc.interfaces_size,
2744
interface);
2745
interface = NULL;
1359
2746
}
1360
2747
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
2748
break;
1378
2749
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
2750
bool interface_was_up = interface_is_up(interface);
2751
errno = bring_up_interface(interface, delay);
2752
if(not interface_was_up){
2753
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2756
} else {
2757
errno = argz_add(&interfaces_to_take_down,
2758
&interfaces_to_take_down_size,
2759
interface);
2760
if(errno != 0){
2761
perror_plus("argz_add");
2762
}
2763
}
2764
}
2765
}
2766
if(debug and (interfaces_to_take_down == NULL)){
2767
fprintf_plus(stderr, "No interfaces were brought up\n");
2768
}
2769
}
2770
2771
/* If we only got one interface, explicitly use only that one */
2772
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2773
if(debug){
2774
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2775
mc.interfaces);
2776
}
2777
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1416
2778
}
1417
2779
1418
2780
if(quit_now){
1419
2781
goto end;
1420
2782
}
1421
2783
1422
ret = init_gnutls_global(pubkey, seckey);
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1423
2785
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
2786
fprintf_plus(stderr, "init_gnutls_global failed\n");
1425
2787
exitcode = EX_UNAVAILABLE;
1426
2788
goto end;
1427
2789
} else {
1432
2794
goto end;
1433
2795
}
1434
2796
1435
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
2797
/* Try /run/tmp before /tmp */
2798
tempdir = mkdtemp(run_tempdir);
2799
if(tempdir == NULL and errno == ENOENT){
2800
if(debug){
2801
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2802
run_tempdir, old_tempdir);
2803
}
2804
tempdir = mkdtemp(old_tempdir);
2805
}
2806
if(tempdir == NULL){
2807
perror_plus("mkdtemp");
1439
2808
goto end;
1440
2809
}
1441
2810
1443
2812
goto end;
1444
2813
}
1445
2814
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
2815
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2816
fprintf_plus(stderr, "init_gpgme failed\n");
1448
2817
exitcode = EX_UNAVAILABLE;
1449
2818
goto end;
1450
2819
} else {
1459
2828
/* Connect directly, do not use Zeroconf */
1460
2829
/* (Mainly meant for debugging) */
1461
2830
char *address = strrchr(connect_to, ':');
2831
1462
2832
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
2833
fprintf_plus(stderr, "No colon in address\n");
1464
2834
exitcode = EX_USAGE;
1465
2835
goto end;
1466
2836
}
1469
2839
goto end;
1470
2840
}
1471
2841
1472
uint16_t port;
2842
in_port_t port;
1473
2843
errno = 0;
1474
2844
tmpmax = strtoimax(address+1, &tmp, 10);
1475
2845
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2846
or tmpmax != (in_port_t)tmpmax){
2847
fprintf_plus(stderr, "Bad port number\n");
1478
2848
exitcode = EX_USAGE;
1479
2849
goto end;
1480
2850
}
1481
2851
1482
2852
if(quit_now){
1483
2853
goto end;
1484
2854
}
1485
2855
1486
port = (uint16_t)tmpmax;
2856
port = (in_port_t)tmpmax;
1487
2857
*address = '\0';
1488
address = connect_to;
1489
2858
/* Colon in address indicates IPv6 */
1490
2859
int af;
1491
if(strchr(address, ':') != NULL){
2860
if(strchr(connect_to, ':') != NULL){
1492
2861
af = AF_INET6;
2862
/* Accept [] around IPv6 address - see RFC 5952 */
2863
if(connect_to[0] == '[' and address[-1] == ']')
2864
{
2865
connect_to++;
2866
address[-1] = '\0';
2867
}
1493
2868
} else {
1494
2869
af = AF_INET;
1495
2870
}
2871
address = connect_to;
1496
2872
1497
2873
if(quit_now){
1498
2874
goto end;
1499
2875
}
1500
2876
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2877
while(not quit_now){
2878
ret = start_mandos_communication(address, port, if_index, af,
2879
&mc);
2880
if(quit_now or ret == 0){
2881
break;
2882
}
2883
if(debug){
2884
fprintf_plus(stderr, "Retrying in %d seconds\n",
2885
(int)retry_interval);
2886
}
2887
sleep((unsigned int)retry_interval);
2888
}
2889
2890
if(not quit_now){
1523
2891
exitcode = EXIT_SUCCESS;
1524
2892
}
2893
1525
2894
goto end;
1526
2895
}
1527
2896
1539
2908
config.publish_domain = 0;
1540
2909
1541
2910
/* Allocate a new server */
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret_errno);
1545
2913
1546
2914
/* Free the Avahi configuration data */
1547
2915
avahi_server_config_free(&config);
1549
2917
1550
2918
/* Check if creating the Avahi server object succeeded */
1551
2919
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
2920
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret_errno));
1554
2922
exitcode = EX_UNAVAILABLE;
1555
2923
goto end;
1556
2924
}
1562
2930
/* Create the Avahi service browser */
1563
2931
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
2932
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
2933
NULL, 0, browse_callback,
2934
(void *)&mc);
1566
2935
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
2936
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2937
avahi_strerror(avahi_server_errno(mc.server)));
1569
2938
exitcode = EX_UNAVAILABLE;
1570
2939
goto end;
1571
2940
}
1577
2946
/* Run the main loop */
1578
2947
1579
2948
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
2949
fprintf_plus(stderr, "Starting Avahi loop search\n");
1581
2950
}
1582
2951
1583
avahi_simple_poll_loop(mc.simple_poll);
2952
ret = avahi_loop_with_timeout(simple_poll,
2953
(int)(retry_interval * 1000), &mc);
2954
if(debug){
2955
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2956
(ret == 0) ? "successfully" : "with error");
2957
}
1584
2958
1585
2959
end:
1586
2960
1587
2961
if(debug){
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2962
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1589
2963
}
1590
2964
1591
2965
/* Cleanup things */
2966
free(mc.interfaces);
2967
1592
2968
if(sb != NULL)
1593
2969
avahi_s_service_browser_free(sb);
1594
2970
1595
2971
if(mc.server != NULL)
1596
2972
avahi_server_free(mc.server);
1597
2973
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
2974
if(simple_poll != NULL)
2975
avahi_simple_poll_free(simple_poll);
1600
2976
1601
2977
if(gnutls_initialized){
1602
2978
gnutls_certificate_free_credentials(mc.cred);
1608
2984
gpgme_release(mc.ctx);
1609
2985
}
1610
2986
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
1618
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
1628
}
1629
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
1639
}
1640
}
1641
}
1642
1643
/* Removes the temp directory used by GPGME */
1644
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
1665
char *fullname = NULL;
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
direntry->d_name);
1668
if(ret < 0){
1669
perror("asprintf");
1670
continue;
1671
}
1672
ret = remove(fullname);
1673
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
1676
}
1677
free(fullname);
1678
}
1679
closedir(d);
1680
}
1681
ret = rmdir(tempdir);
1682
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
2987
/* Cleans up the circular linked list of Mandos servers the client
2988
has seen */
2989
if(mc.current_server != NULL){
2990
mc.current_server->prev->next = NULL;
2991
while(mc.current_server != NULL){
2992
server *next = mc.current_server->next;
2993
#ifdef __GNUC__
2994
#pragma GCC diagnostic push
2995
#pragma GCC diagnostic ignored "-Wcast-qual"
2996
#endif
2997
free((char *)(mc.current_server->ip));
2998
#ifdef __GNUC__
2999
#pragma GCC diagnostic pop
3000
#endif
3001
free(mc.current_server);
3002
mc.current_server = next;
3003
}
3004
}
3005
3006
/* Re-raise privileges */
3007
{
3008
ret_errno = raise_privileges();
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3011
perror_plus("Failed to raise privileges");
3012
} else {
3013
3014
/* Run network hooks */
3015
run_network_hooks("stop", interfaces_hooks != NULL ?
3016
interfaces_hooks : "", delay);
3017
3018
/* Take down the network interfaces which were brought up */
3019
{
3020
char *interface = NULL;
3021
while((interface=argz_next(interfaces_to_take_down,
3022
interfaces_to_take_down_size,
3023
interface))){
3024
ret_errno = take_down_interface(interface);
3025
if(ret_errno != 0){
3026
errno = ret_errno;
3027
perror_plus("Failed to take down interface");
3028
}
3029
}
3030
if(debug and (interfaces_to_take_down == NULL)){
3031
fprintf_plus(stderr, "No interfaces needed to be taken"
3032
" down\n");
3033
}
3034
}
3035
}
3036
3037
ret_errno = lower_privileges_permanently();
3038
if(ret_errno != 0){
3039
errno = ret_errno;
3040
perror_plus("Failed to lower privileges permanently");
3041
}
3042
}
3043
3044
free(interfaces_to_take_down);
3045
free(interfaces_hooks);
3046
3047
/* Removes the GPGME temp directory and all files inside */
3048
if(tempdir != NULL){
3049
struct dirent **direntries = NULL;
3050
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3051
| O_NOFOLLOW
3052
| O_DIRECTORY
3053
| O_PATH));
3054
if(tempdir_fd == -1){
3055
perror_plus("open");
3056
} else {
3057
#ifdef __GLIBC__
3058
#if __GLIBC_PREREQ(2, 15)
3059
int numentries = scandirat(tempdir_fd, ".", &direntries,
3060
notdotentries, alphasort);
3061
#else /* not __GLIBC_PREREQ(2, 15) */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3063
alphasort);
3064
#endif /* not __GLIBC_PREREQ(2, 15) */
3065
#else /* not __GLIBC__ */
3066
int numentries = scandir(tempdir, &direntries, notdotentries,
3067
alphasort);
3068
#endif /* not __GLIBC__ */
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3071
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3072
if(ret == -1){
3073
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3074
" \"%s\", 0): %s\n", tempdir,
3075
direntries[i]->d_name, strerror(errno));
3076
}
3077
free(direntries[i]);
3078
}
3079
3080
/* need to clean even if 0 because man page doesn't specify */
3081
free(direntries);
3082
if(numentries == -1){
3083
perror_plus("scandir");
3084
}
3085
ret = rmdir(tempdir);
3086
if(ret == -1 and errno != ENOENT){
3087
perror_plus("rmdir");
3088
}
3089
}
3090
close(tempdir_fd);
1684
3091
}
1685
3092
}
1686
3093
1691
3098
&old_sigterm_action,
1692
3099
NULL));
1693
3100
if(ret == -1){
1694
perror("sigaction");
3101
perror_plus("sigaction");
1695
3102
}
1696
3103
do {
1697
3104
ret = raise(signal_received);
1698
3105
} while(ret != 0 and errno == EINTR);
1699
3106
if(ret != 0){
1700
perror("raise");
3107
perror_plus("raise");
1701
3108
abort();
1702
3109
}
1703
3110
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0