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- Committer: Teddy Hogeborn
- Date: 2015-07-12 01:25:14 UTC
- Revision ID: teddy@recompile.se-20150712012514-x4wdgi1hz46h0apg
debian/mandos-client.README.Debian: Document the dhparams.pem file.
- files added:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2010 Teddy Hogeborn
13
* Copyright © 2008-2010 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() */
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 */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
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>";
130
142
static const char sys_class_net[] = "/sys/class/net";
131
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;
132
159
133
160
/* Used for passing in values through the Avahi callback functions */
134
161
typedef struct {
135
AvahiSimplePoll *simple_poll;
136
162
AvahiServer *server;
137
163
gnutls_certificate_credentials_t cred;
138
164
unsigned int dh_bits;
139
165
gnutls_dh_params_t dh_params;
140
166
const char *priority;
141
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
142
171
} mandos_context;
143
172
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
148
175
149
176
sig_atomic_t quit_now = 0;
150
177
int signal_received = 0;
151
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
152
198
/*
153
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
200
* bytes. "buffer_capacity" is how much is currently allocated,
155
201
* "buffer_length" is how much is already used.
156
202
*/
203
__attribute__((nonnull, warn_unused_result))
157
204
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
205
size_t buffer_capacity){
159
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
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;
162
213
return 0;
163
214
}
215
*buffer = new_buf;
164
216
buffer_capacity += BUFFER_SIZE;
165
217
}
166
218
return buffer_capacity;
167
219
}
168
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
169
269
/*
170
270
* Initialize GPGME.
171
271
*/
172
static bool init_gpgme(const char *seckey,
173
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){
174
277
gpgme_error_t rc;
175
278
gpgme_engine_info_t engine_info;
176
279
177
178
280
/*
179
281
* Helper function to insert pub and seckey to the engine keyring.
180
282
*/
181
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
182
284
int ret;
183
285
int fd;
184
286
gpgme_data_t pgp_data;
185
287
186
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
289
if(fd == -1){
188
perror("open");
290
perror_plus("open");
189
291
return false;
190
292
}
191
293
192
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
295
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
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));
196
298
return false;
197
299
}
198
300
199
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
200
302
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
203
305
return false;
204
306
}
205
307
206
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
309
if(ret == -1){
208
perror("close");
310
perror_plus("close");
209
311
}
210
312
gpgme_data_release(pgp_data);
211
313
return true;
212
314
}
213
315
214
316
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
216
318
}
217
319
218
320
/* Init GPGME */
219
321
gpgme_check_version(NULL);
220
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
323
if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
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));
224
326
return false;
225
327
}
226
328
227
/* Set GPGME home directory for the OpenPGP engine only */
329
/* Set GPGME home directory for the OpenPGP engine only */
228
330
rc = gpgme_get_engine_info(&engine_info);
229
331
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
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));
232
334
return false;
233
335
}
234
336
while(engine_info != NULL){
240
342
engine_info = engine_info->next;
241
343
}
242
344
if(engine_info == NULL){
243
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);
244
347
return false;
245
348
}
246
349
247
350
/* Create new GPGME "context" */
248
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
249
352
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
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));
252
356
return false;
253
357
}
254
358
263
367
* Decrypt OpenPGP data.
264
368
* Returns -1 on error
265
369
*/
370
__attribute__((nonnull, warn_unused_result))
266
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
372
size_t crypto_size,
268
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
269
375
gpgme_data_t dh_crypto, dh_plain;
270
376
gpgme_error_t rc;
271
377
ssize_t ret;
273
379
ssize_t plaintext_length = 0;
274
380
275
381
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
277
383
}
278
384
279
385
/* Create new GPGME data buffer from memory cryptotext */
280
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
387
0);
282
388
if(rc != GPG_ERR_NO_ERROR){
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
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));
285
391
return -1;
286
392
}
287
393
288
394
/* Create new empty GPGME data buffer for the plaintext */
289
395
rc = gpgme_data_new(&dh_plain);
290
396
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
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));
293
400
gpgme_data_release(dh_crypto);
294
401
return -1;
295
402
}
296
403
297
404
/* Decrypt data from the cryptotext data buffer to the plaintext
298
405
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
300
407
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
303
410
plaintext_length = -1;
304
411
if(debug){
305
412
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
307
414
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
309
416
} else {
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
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);
314
421
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
316
423
}
317
424
gpgme_recipient_t recipient;
318
425
recipient = result->recipients;
319
426
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "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");
326
434
recipient = recipient->next;
327
435
}
328
436
}
331
439
}
332
440
333
441
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
335
443
}
336
444
337
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
447
perror_plus("gpgme_data_seek");
340
448
plaintext_length = -1;
341
449
goto decrypt_end;
342
450
}
344
452
*plaintext = NULL;
345
453
while(true){
346
454
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
349
457
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
353
461
}
354
462
355
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
360
468
break;
361
469
}
362
470
if(ret < 0){
363
perror("gpgme_data_read");
471
perror_plus("gpgme_data_read");
364
472
plaintext_length = -1;
365
473
goto decrypt_end;
366
474
}
368
476
}
369
477
370
478
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
372
480
for(ssize_t i = 0; i < plaintext_length; i++){
373
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
482
}
385
493
return plaintext_length;
386
494
}
387
495
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
391
if(ret == NULL)
392
ret = "(unknown)";
393
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);
394
507
}
395
508
396
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
397
511
static void debuggnutls(__attribute__((unused)) int level,
398
512
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
513
fprintf_plus(stderr, "GnuTLS: %s", string);
400
514
}
401
515
516
__attribute__((nonnull, warn_unused_result))
402
517
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
404
521
int ret;
522
unsigned int uret;
405
523
406
524
if(debug){
407
fprintf(stderr, "Initializing GnuTLS\n");
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
408
526
}
409
527
410
528
ret = gnutls_global_init();
411
529
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
414
532
return -1;
415
533
}
416
534
423
541
}
424
542
425
543
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
427
545
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
433
548
gnutls_global_deinit();
434
549
return -1;
435
550
}
436
551
437
552
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
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);
441
557
}
442
558
443
559
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
445
561
GNUTLS_OPENPGP_FMT_BASE64);
446
562
if(ret != GNUTLS_E_SUCCESS){
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
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));
452
568
goto globalfail;
453
569
}
454
570
455
571
/* GnuTLS server initialization */
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
460
goto globalfail;
461
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
466
goto globalfail;
467
}
468
469
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);
470
752
471
753
return 0;
472
754
473
755
globalfail:
474
756
475
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
476
758
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
478
760
return -1;
479
761
}
480
762
481
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){
482
766
int ret;
483
767
/* GnuTLS session creation */
484
768
do {
488
772
}
489
773
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
774
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
775
fprintf_plus(stderr,
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
493
778
}
494
779
495
780
{
496
781
const char *err;
497
782
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
499
784
if(quit_now){
500
785
gnutls_deinit(*session);
501
786
return -1;
502
787
}
503
788
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
789
if(ret != GNUTLS_E_SUCCESS){
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
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));
508
793
gnutls_deinit(*session);
509
794
return -1;
510
795
}
512
797
513
798
do {
514
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
800
mc->cred);
516
801
if(quit_now){
517
802
gnutls_deinit(*session);
518
803
return -1;
519
804
}
520
805
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
806
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
524
809
gnutls_deinit(*session);
525
810
return -1;
526
811
}
528
813
/* ignore client certificate if any. */
529
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
530
815
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
532
533
816
return 0;
534
817
}
535
818
537
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
538
821
__attribute__((unused)) const char *txt){}
539
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 = (int)TEMP_FAILURE_RETRY(close(devnull));
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
_exit(EX_UNAVAILABLE);
958
}
959
TEMP_FAILURE_RETRY(close(helperdir_fd));
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
540
1040
/* Called when a Mandos server is found */
541
static int start_mandos_communication(const char *ip, uint16_t port,
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
542
1043
AvahiIfIndex if_index,
543
int af){
1044
int af, mandos_context *mc){
544
1045
int ret, tcp_sd = -1;
545
1046
ssize_t sret;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
1047
struct sockaddr_storage to;
550
1048
char *buffer = NULL;
551
1049
char *decrypted_buffer = NULL;
552
1050
size_t buffer_length = 0;
555
1053
int retval = -1;
556
1054
gnutls_session_t session;
557
1055
int pf; /* Protocol family */
1056
bool route_added = false;
558
1057
559
1058
errno = 0;
560
1059
571
1070
pf = PF_INET;
572
1071
break;
573
1072
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
1073
fprintf_plus(stderr, "Bad address family: %d\n", af);
575
1074
errno = EINVAL;
576
1075
return -1;
577
1076
}
578
1077
579
ret = init_gnutls_session(&session);
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
1106
return -1;
1107
}
1108
}
1109
1110
ret = init_gnutls_session(&session, mc);
580
1111
if(ret != 0){
581
1112
return -1;
582
1113
}
583
1114
584
1115
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
587
1118
}
588
1119
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
590
1121
if(tcp_sd < 0){
591
1122
int e = errno;
592
perror("socket");
1123
perror_plus("socket");
593
1124
errno = e;
594
1125
goto mandos_end;
595
1126
}
601
1132
602
1133
memset(&to, 0, sizeof(to));
603
1134
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1135
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1136
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
606
1137
} else { /* IPv4 */
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
1138
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1139
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
609
1140
}
610
1141
if(ret < 0 ){
611
1142
int e = errno;
612
perror("inet_pton");
1143
perror_plus("inet_pton");
613
1144
errno = e;
614
1145
goto mandos_end;
615
1146
}
616
1147
if(ret == 0){
617
1148
int e = errno;
618
fprintf(stderr, "Bad address: %s\n", ip);
1149
fprintf_plus(stderr, "Bad address: %s\n", ip);
619
1150
errno = e;
620
1151
goto mandos_end;
621
1152
}
622
1153
if(af == AF_INET6){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
630
1157
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
1159
" incomplete without a network interface\n");
633
1160
errno = EINVAL;
634
1161
goto mandos_end;
635
1162
}
636
1163
/* Set the network interface number as scope */
637
to.in6.sin6_scope_id = (uint32_t)if_index;
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
638
1165
}
639
1166
} else {
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
643
1168
}
644
1169
645
1170
if(quit_now){
651
1176
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
1177
char interface[IF_NAMESIZE];
653
1178
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
1179
perror_plus("if_indextoname");
655
1180
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
658
1183
}
659
1184
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
662
1187
}
663
1188
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
1189
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
666
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
669
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
672
}
673
if(pcret == NULL){
674
perror("inet_ntop");
675
} else {
676
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
678
}
679
}
680
}
681
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
}
692
if(ret < 0){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
int e = errno;
695
perror("connect");
696
errno = e;
697
}
698
goto mandos_end;
699
}
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(errno == ENETUNREACH
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
704
1270
}
705
1271
706
1272
const char *out = mandos_protocol_version;
708
1274
while(true){
709
1275
size_t out_size = strlen(out);
710
1276
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
out_size - written));
1277
out_size - written));
712
1278
if(ret == -1){
713
1279
int e = errno;
714
perror("write");
1280
perror_plus("write");
715
1281
errno = e;
716
1282
goto mandos_end;
717
1283
}
734
1300
}
735
1301
736
1302
if(debug){
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1303
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
738
1304
}
739
1305
740
1306
if(quit_now){
742
1308
goto mandos_end;
743
1309
}
744
1310
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1311
/* This casting via intptr_t is to eliminate warning about casting
1312
an int to a pointer type. This is exactly how the GnuTLS Guile
1313
function "set-session-transport-fd!" does it. */
1314
gnutls_transport_set_ptr(session,
1315
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
746
1316
747
1317
if(quit_now){
748
1318
errno = EINTR;
759
1329
760
1330
if(ret != GNUTLS_E_SUCCESS){
761
1331
if(debug){
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1332
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
763
1333
gnutls_perror(ret);
764
1334
}
765
1335
errno = EPROTO;
769
1339
/* Read OpenPGP packet that contains the wanted password */
770
1340
771
1341
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
1342
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1343
" %s\n", ip);
774
1344
}
775
1345
776
1346
while(true){
781
1351
}
782
1352
783
1353
buffer_capacity = incbuffer(&buffer, buffer_length,
784
buffer_capacity);
1354
buffer_capacity);
785
1355
if(buffer_capacity == 0){
786
1356
int e = errno;
787
perror("incbuffer");
1357
perror_plus("incbuffer");
788
1358
errno = e;
789
1359
goto mandos_end;
790
1360
}
814
1384
}
815
1385
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
1386
if(ret < 0){
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1387
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1388
"***\n");
818
1389
gnutls_perror(ret);
819
1390
errno = EPROTO;
820
1391
goto mandos_end;
821
1392
}
822
1393
break;
823
1394
default:
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
1395
fprintf_plus(stderr, "Unknown error while reading data from"
1396
" encrypted session with Mandos server\n");
826
1397
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
1398
errno = EIO;
828
1399
goto mandos_end;
833
1404
}
834
1405
835
1406
if(debug){
836
fprintf(stderr, "Closing TLS session\n");
1407
fprintf_plus(stderr, "Closing TLS session\n");
837
1408
}
838
1409
839
1410
if(quit_now){
851
1422
852
1423
if(buffer_length > 0){
853
1424
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
856
&decrypted_buffer);
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1426
&decrypted_buffer, mc);
857
1427
if(decrypted_buffer_size >= 0){
858
1428
859
1429
written = 0;
869
1439
if(ret == 0 and ferror(stdout)){
870
1440
int e = errno;
871
1441
if(debug){
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
1442
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1443
strerror(errno));
874
1444
}
875
1445
errno = e;
876
1446
goto mandos_end;
885
1455
886
1456
mandos_end:
887
1457
{
1458
if(route_added){
1459
if(not delete_local_route(ip, if_index)){
1460
fprintf_plus(stderr, "Failed to delete local route to %s on"
1461
" interface %d", ip, if_index);
1462
}
1463
}
888
1464
int e = errno;
889
1465
free(decrypted_buffer);
890
1466
free(buffer);
895
1471
if(e == 0){
896
1472
e = errno;
897
1473
}
898
perror("close");
1474
perror_plus("close");
899
1475
}
900
1476
gnutls_deinit(session);
1477
errno = e;
901
1478
if(quit_now){
902
e = EINTR;
1479
errno = EINTR;
903
1480
retval = -1;
904
1481
}
905
errno = e;
906
1482
}
907
1483
return retval;
908
1484
}
909
1485
1486
__attribute__((nonnull))
910
1487
static void resolve_callback(AvahiSServiceResolver *r,
911
1488
AvahiIfIndex interface,
912
1489
AvahiProtocol proto,
920
1497
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
1498
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
1499
flags,
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
1500
void *mc){
1501
if(r == NULL){
1502
return;
1503
}
925
1504
926
1505
/* Called whenever a service has been resolved successfully or
927
1506
timed out */
928
1507
929
1508
if(quit_now){
1509
avahi_s_service_resolver_free(r);
930
1510
return;
931
1511
}
932
1512
933
1513
switch(event){
934
1514
default:
935
1515
case AVAHI_RESOLVER_FAILURE:
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
1516
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1517
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1518
domain,
1519
avahi_strerror(avahi_server_errno
1520
(((mandos_context*)mc)->server)));
939
1521
break;
940
1522
941
1523
case AVAHI_RESOLVER_FOUND:
943
1525
char ip[AVAHI_ADDRESS_STR_MAX];
944
1526
avahi_address_snprint(ip, sizeof(ip), address);
945
1527
if(debug){
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
1528
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1529
PRIdMAX ") on port %" PRIu16 "\n", name,
1530
host_name, ip, (intmax_t)interface, port);
949
1531
}
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
1532
int ret = start_mandos_communication(ip, (in_port_t)port,
1533
interface,
1534
avahi_proto_to_af(proto),
1535
mc);
952
1536
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
1537
avahi_simple_poll_quit(simple_poll);
1538
} else {
1539
if(not add_server(ip, (in_port_t)port, interface,
1540
avahi_proto_to_af(proto),
1541
&((mandos_context*)mc)->current_server)){
1542
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1543
" list\n", name);
1544
}
954
1545
}
955
1546
}
956
1547
}
966
1557
const char *domain,
967
1558
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
1559
flags,
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
1560
void *mc){
1561
if(b == NULL){
1562
return;
1563
}
971
1564
972
1565
/* Called whenever a new services becomes available on the LAN or
973
1566
is removed from the LAN */
980
1573
default:
981
1574
case AVAHI_BROWSER_FAILURE:
982
1575
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1576
fprintf_plus(stderr, "(Avahi browser) %s\n",
1577
avahi_strerror(avahi_server_errno
1578
(((mandos_context*)mc)->server)));
1579
avahi_simple_poll_quit(simple_poll);
986
1580
return;
987
1581
988
1582
case AVAHI_BROWSER_NEW:
991
1585
the callback function is called the Avahi server will free the
992
1586
resolver for us. */
993
1587
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1588
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1589
interface, protocol, name, type,
1590
domain, protocol, 0,
1591
resolve_callback, mc) == NULL)
1592
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1593
" %s\n", name,
1594
avahi_strerror(avahi_server_errno
1595
(((mandos_context*)mc)->server)));
999
1596
break;
1000
1597
1001
1598
case AVAHI_BROWSER_REMOVE:
1004
1601
case AVAHI_BROWSER_ALL_FOR_NOW:
1005
1602
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1006
1603
if(debug){
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1604
fprintf_plus(stderr, "No Mandos server found, still"
1605
" searching...\n");
1008
1606
}
1009
1607
break;
1010
1608
}
1011
1609
}
1012
1610
1013
/* stop main loop after sigterm has been called */
1611
/* Signal handler that stops main loop after SIGTERM */
1014
1612
static void handle_sigterm(int sig){
1015
1613
if(quit_now){
1016
1614
return;
1018
1616
quit_now = 1;
1019
1617
signal_received = sig;
1020
1618
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1619
/* set main loop to exit */
1620
if(simple_poll != NULL){
1621
avahi_simple_poll_quit(simple_poll);
1023
1622
}
1024
1623
errno = old_errno;
1025
1624
}
1026
1625
1626
__attribute__((nonnull, warn_unused_result))
1627
bool get_flags(const char *ifname, struct ifreq *ifr){
1628
int ret;
1629
error_t ret_errno;
1630
1631
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1632
if(s < 0){
1633
ret_errno = errno;
1634
perror_plus("socket");
1635
errno = ret_errno;
1636
return false;
1637
}
1638
strcpy(ifr->ifr_name, ifname);
1639
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1640
if(ret == -1){
1641
if(debug){
1642
ret_errno = errno;
1643
perror_plus("ioctl SIOCGIFFLAGS");
1644
errno = ret_errno;
1645
}
1646
return false;
1647
}
1648
return true;
1649
}
1650
1651
__attribute__((nonnull, warn_unused_result))
1652
bool good_flags(const char *ifname, const struct ifreq *ifr){
1653
1654
/* Reject the loopback device */
1655
if(ifr->ifr_flags & IFF_LOOPBACK){
1656
if(debug){
1657
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1658
ifname);
1659
}
1660
return false;
1661
}
1662
/* Accept point-to-point devices only if connect_to is specified */
1663
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1664
if(debug){
1665
fprintf_plus(stderr, "Accepting point-to-point interface"
1666
" \"%s\"\n", ifname);
1667
}
1668
return true;
1669
}
1670
/* Otherwise, reject non-broadcast-capable devices */
1671
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1672
if(debug){
1673
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1674
" \"%s\"\n", ifname);
1675
}
1676
return false;
1677
}
1678
/* Reject non-ARP interfaces (including dummy interfaces) */
1679
if(ifr->ifr_flags & IFF_NOARP){
1680
if(debug){
1681
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1682
ifname);
1683
}
1684
return false;
1685
}
1686
1687
/* Accept this device */
1688
if(debug){
1689
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1690
}
1691
return true;
1692
}
1693
1027
1694
/*
1028
1695
* This function determines if a directory entry in /sys/class/net
1029
1696
* corresponds to an acceptable network device.
1030
1697
* (This function is passed to scandir(3) as a filter function.)
1031
1698
*/
1699
__attribute__((nonnull, warn_unused_result))
1032
1700
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
1701
if(if_entry->d_name[0] == '.'){
1042
1702
return 0;
1043
1703
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1704
1705
struct ifreq ifr;
1706
if(not get_flags(if_entry->d_name, &ifr)){
1707
if(debug){
1708
fprintf_plus(stderr, "Failed to get flags for interface "
1709
"\"%s\"\n", if_entry->d_name);
1710
}
1711
return 0;
1712
}
1713
1714
if(not good_flags(if_entry->d_name, &ifr)){
1715
return 0;
1716
}
1717
return 1;
1718
}
1719
1720
/*
1721
* This function determines if a network interface is up.
1722
*/
1723
__attribute__((nonnull, warn_unused_result))
1724
bool interface_is_up(const char *interface){
1725
struct ifreq ifr;
1726
if(not get_flags(interface, &ifr)){
1727
if(debug){
1728
fprintf_plus(stderr, "Failed to get flags for interface "
1729
"\"%s\"\n", interface);
1730
}
1731
return false;
1732
}
1733
1734
return (bool)(ifr.ifr_flags & IFF_UP);
1735
}
1736
1737
/*
1738
* This function determines if a network interface is running
1739
*/
1740
__attribute__((nonnull, warn_unused_result))
1741
bool interface_is_running(const char *interface){
1742
struct ifreq ifr;
1743
if(not get_flags(interface, &ifr)){
1744
if(debug){
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
}
1748
return false;
1749
}
1750
1751
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1752
}
1753
1754
__attribute__((nonnull, pure, warn_unused_result))
1755
int notdotentries(const struct dirent *direntry){
1756
/* Skip "." and ".." */
1757
if(direntry->d_name[0] == '.'
1758
and (direntry->d_name[1] == '\0'
1759
or (direntry->d_name[1] == '.'
1760
and direntry->d_name[2] == '\0'))){
1761
return 0;
1762
}
1763
return 1;
1764
}
1765
1766
/* Is this directory entry a runnable program? */
1767
__attribute__((nonnull, warn_unused_result))
1768
int runnable_hook(const struct dirent *direntry){
1769
int ret;
1770
size_t sret;
1771
struct stat st;
1772
1773
if((direntry->d_name)[0] == '\0'){
1774
/* Empty name? */
1775
return 0;
1776
}
1777
1778
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1779
"abcdefghijklmnopqrstuvwxyz"
1780
"0123456789"
1781
"_.-");
1782
if((direntry->d_name)[sret] != '\0'){
1783
/* Contains non-allowed characters */
1784
if(debug){
1785
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1786
direntry->d_name);
1787
}
1788
return 0;
1789
}
1790
1791
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1792
if(ret == -1){
1793
if(debug){
1794
perror_plus("Could not stat hook");
1795
}
1796
return 0;
1797
}
1798
if(not (S_ISREG(st.st_mode))){
1799
/* Not a regular file */
1800
if(debug){
1801
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1802
direntry->d_name);
1803
}
1804
return 0;
1805
}
1806
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1807
/* Not executable */
1808
if(debug){
1809
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1810
direntry->d_name);
1811
}
1812
return 0;
1813
}
1814
if(debug){
1815
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1816
direntry->d_name);
1817
}
1818
return 1;
1819
}
1820
1821
__attribute__((nonnull, warn_unused_result))
1822
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1823
mandos_context *mc){
1824
int ret;
1825
struct timespec now;
1826
struct timespec waited_time;
1827
intmax_t block_time;
1828
1829
while(true){
1830
if(mc->current_server == NULL){
1831
if(debug){
1832
fprintf_plus(stderr, "Wait until first server is found."
1833
" No timeout!\n");
1834
}
1835
ret = avahi_simple_poll_iterate(s, -1);
1836
} else {
1837
if(debug){
1838
fprintf_plus(stderr, "Check current_server if we should run"
1839
" it, or wait\n");
1840
}
1841
/* the current time */
1842
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1843
if(ret == -1){
1844
perror_plus("clock_gettime");
1845
return -1;
1846
}
1847
/* Calculating in ms how long time between now and server
1848
who we visted longest time ago. Now - last seen. */
1849
waited_time.tv_sec = (now.tv_sec
1850
- mc->current_server->last_seen.tv_sec);
1851
waited_time.tv_nsec = (now.tv_nsec
1852
- mc->current_server->last_seen.tv_nsec);
1853
/* total time is 10s/10,000ms.
1854
Converting to s from ms by dividing by 1,000,
1855
and ns to ms by dividing by 1,000,000. */
1856
block_time = ((retry_interval
1857
- ((intmax_t)waited_time.tv_sec * 1000))
1858
- ((intmax_t)waited_time.tv_nsec / 1000000));
1859
1860
if(debug){
1861
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1862
block_time);
1863
}
1864
1865
if(block_time <= 0){
1866
ret = start_mandos_communication(mc->current_server->ip,
1867
mc->current_server->port,
1868
mc->current_server->if_index,
1869
mc->current_server->af, mc);
1870
if(ret == 0){
1871
avahi_simple_poll_quit(s);
1872
return 0;
1873
}
1874
ret = clock_gettime(CLOCK_MONOTONIC,
1875
&mc->current_server->last_seen);
1876
if(ret == -1){
1877
perror_plus("clock_gettime");
1878
return -1;
1879
}
1880
mc->current_server = mc->current_server->next;
1881
block_time = 0; /* Call avahi to find new Mandos
1882
servers, but don't block */
1883
}
1884
1885
ret = avahi_simple_poll_iterate(s, (int)block_time);
1886
}
1887
if(ret != 0){
1888
if(ret > 0 or errno != EINTR){
1889
return (ret != 1) ? ret : 0;
1890
}
1891
}
1892
}
1893
}
1894
1895
__attribute__((nonnull))
1896
void run_network_hooks(const char *mode, const char *interface,
1897
const float delay){
1898
struct dirent **direntries = NULL;
1899
if(hookdir_fd == -1){
1900
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1901
| O_CLOEXEC);
1902
if(hookdir_fd == -1){
1903
if(errno == ENOENT){
1904
if(debug){
1905
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1906
" found\n", hookdir);
1907
}
1908
} else {
1909
perror_plus("open");
1910
}
1911
return;
1912
}
1913
}
1914
#ifdef __GLIBC__
1915
#if __GLIBC_PREREQ(2, 15)
1916
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1917
runnable_hook, alphasort);
1918
#else /* not __GLIBC_PREREQ(2, 15) */
1919
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1920
alphasort);
1921
#endif /* not __GLIBC_PREREQ(2, 15) */
1922
#else /* not __GLIBC__ */
1923
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1924
alphasort);
1925
#endif /* not __GLIBC__ */
1926
if(numhooks == -1){
1927
perror_plus("scandir");
1928
return;
1929
}
1930
struct dirent *direntry;
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1939
if(debug){
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1941
direntry->d_name);
1942
}
1943
pid_t hook_pid = fork();
1944
if(hook_pid == 0){
1945
/* Child */
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1948
if(errno != 0){
1949
perror_plus("Failed to raise privileges");
1950
_exit(EX_NOPERM);
1951
}
1952
/* Set group */
1953
errno = 0;
1954
ret = setgid(0);
1955
if(ret == -1){
1956
perror_plus("setgid");
1957
_exit(EX_NOPERM);
1958
}
1959
/* Reset supplementary groups */
1960
errno = 0;
1961
ret = setgroups(0, NULL);
1962
if(ret == -1){
1963
perror_plus("setgroups");
1964
_exit(EX_NOPERM);
1965
}
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
if(ret == -1){
1968
perror_plus("setenv");
1969
_exit(EX_OSERR);
1970
}
1971
ret = setenv("DEVICE", interface, 1);
1972
if(ret == -1){
1973
perror_plus("setenv");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
if(ret == -1){
1978
perror_plus("setenv");
1979
_exit(EX_OSERR);
1980
}
1981
ret = setenv("MODE", mode, 1);
1982
if(ret == -1){
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
char *delaystring;
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1988
if(ret == -1){
1989
perror_plus("asprintf");
1990
_exit(EX_OSERR);
1991
}
1992
ret = setenv("DELAY", delaystring, 1);
1993
if(ret == -1){
1994
free(delaystring);
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
free(delaystring);
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
2009
if(hook_fd == -1){
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2012
}
2013
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2016
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2023
if(ret == -1){
2024
perror_plus("close");
2025
_exit(EX_OSERR);
2026
}
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
if(ret == -1){
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2030
_exit(EX_OSERR);
2031
}
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
environ) == -1){
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2036
}
2037
} else {
2038
if(hook_pid == -1){
2039
perror_plus("fork");
2040
free(direntry);
2041
continue;
2042
}
2043
int status;
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2046
free(direntry);
2047
continue;
2048
}
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2054
free(direntry);
2055
continue;
2056
}
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2060
WTERMSIG(status));
2061
free(direntry);
2062
continue;
2063
} else {
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2066
free(direntry);
2067
continue;
2068
}
2069
}
2070
if(debug){
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2072
direntry->d_name);
2073
}
2074
free(direntry);
2075
}
2076
free(direntries);
2077
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2078
perror_plus("close");
2079
} else {
2080
hookdir_fd = -1;
2081
}
2082
close(devnull);
2083
}
2084
2085
__attribute__((nonnull, warn_unused_result))
2086
error_t bring_up_interface(const char *const interface,
2087
const float delay){
2088
error_t old_errno = errno;
2089
int ret;
2090
struct ifreq network;
2091
unsigned int if_index = if_nametoindex(interface);
2092
if(if_index == 0){
2093
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2094
errno = old_errno;
2095
return ENXIO;
2096
}
2097
2098
if(quit_now){
2099
errno = old_errno;
2100
return EINTR;
2101
}
2102
2103
if(not interface_is_up(interface)){
2104
error_t ret_errno = 0, ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
2106
ret_errno = errno;
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2108
"\"%s\"\n", interface);
2109
errno = old_errno;
2110
return ret_errno;
2111
}
2112
network.ifr_flags |= IFF_UP; /* set flag */
2113
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2115
if(sd == -1){
2116
ret_errno = errno;
2117
perror_plus("socket");
2118
errno = old_errno;
2119
return ret_errno;
2120
}
2121
2122
if(quit_now){
2123
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2124
if(ret == -1){
2125
perror_plus("close");
2126
}
2127
errno = old_errno;
2128
return EINTR;
2129
}
2130
2131
if(debug){
2132
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2133
interface);
2134
}
2135
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2138
if(ret_errno != 0){
2139
errno = ret_errno;
2140
perror_plus("Failed to raise privileges");
2141
}
2142
2143
#ifdef __linux__
2144
int ret_linux;
2145
bool restore_loglevel = false;
2146
if(ret_errno == 0){
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2152
} else {
2153
restore_loglevel = true;
2154
}
2155
}
2156
#endif /* __linux__ */
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
2159
#ifdef __linux__
2160
if(restore_loglevel){
2161
ret_linux = klogctl(7, NULL, 0);
2162
if(ret_linux == -1){
2163
perror_plus("klogctl");
2164
}
2165
}
2166
#endif /* __linux__ */
2167
2168
/* If raise_privileges() succeeded above */
2169
if(ret_errno == 0){
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2172
if(ret_errno != 0){
2173
errno = ret_errno;
2174
perror_plus("Failed to lower privileges");
2175
}
2176
}
2177
2178
/* Close the socket */
2179
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2180
if(ret == -1){
2181
perror_plus("close");
2182
}
2183
2184
if(ret_setflags == -1){
2185
errno = ioctl_errno;
2186
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2187
errno = old_errno;
2188
return ioctl_errno;
2189
}
2190
} else if(debug){
2191
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2192
interface);
2193
}
2194
2195
/* Sleep checking until interface is running.
2196
Check every 0.25s, up to total time of delay */
2197
for(int i=0; i < delay * 4; i++){
2198
if(interface_is_running(interface)){
1070
2199
break;
1071
2200
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1114
/* Accept this device */
1115
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
2201
struct timespec sleeptime = { .tv_nsec = 250000000 };
2202
ret = nanosleep(&sleeptime, NULL);
2203
if(ret == -1 and errno != EINTR){
2204
perror_plus("nanosleep");
2205
}
2206
}
2207
2208
errno = old_errno;
2209
return 0;
2210
}
2211
2212
__attribute__((nonnull, warn_unused_result))
2213
error_t take_down_interface(const char *const interface){
2214
error_t old_errno = errno;
2215
struct ifreq network;
2216
unsigned int if_index = if_nametoindex(interface);
2217
if(if_index == 0){
2218
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2219
errno = old_errno;
2220
return ENXIO;
2221
}
2222
if(interface_is_up(interface)){
2223
error_t ret_errno = 0, ioctl_errno = 0;
2224
if(not get_flags(interface, &network) and debug){
2225
ret_errno = errno;
2226
fprintf_plus(stderr, "Failed to get flags for interface "
2227
"\"%s\"\n", interface);
2228
errno = old_errno;
2229
return ret_errno;
2230
}
2231
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2232
2233
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2234
if(sd == -1){
2235
ret_errno = errno;
2236
perror_plus("socket");
2237
errno = old_errno;
2238
return ret_errno;
2239
}
2240
2241
if(debug){
2242
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2243
interface);
2244
}
2245
2246
/* Raise privileges */
2247
ret_errno = raise_privileges();
2248
if(ret_errno != 0){
2249
errno = ret_errno;
2250
perror_plus("Failed to raise privileges");
2251
}
2252
2253
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2254
ioctl_errno = errno;
2255
2256
/* If raise_privileges() succeeded above */
2257
if(ret_errno == 0){
2258
/* Lower privileges */
2259
ret_errno = lower_privileges();
2260
if(ret_errno != 0){
2261
errno = ret_errno;
2262
perror_plus("Failed to lower privileges");
2263
}
2264
}
2265
2266
/* Close the socket */
2267
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
2271
2272
if(ret_setflags == -1){
2273
errno = ioctl_errno;
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2275
errno = old_errno;
2276
return ioctl_errno;
2277
}
2278
} else if(debug){
2279
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2280
interface);
2281
}
2282
2283
errno = old_errno;
2284
return 0;
1120
2285
}
1121
2286
1122
2287
int main(int argc, char *argv[]){
2288
mandos_context mc = { .server = NULL, .dh_bits = 0,
2289
.priority = "SECURE256:!CTYPE-X.509:"
2290
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2291
.interfaces = NULL, .interfaces_size = 0 };
1123
2292
AvahiSServiceBrowser *sb = NULL;
1124
int error;
2293
error_t ret_errno;
1125
2294
int ret;
1126
2295
intmax_t tmpmax;
1127
2296
char *tmp;
1128
2297
int exitcode = EXIT_SUCCESS;
1129
const char *interface = "";
1130
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
1133
uid_t uid;
1134
gid_t gid;
1135
char tempdir[] = "/tmp/mandosXXXXXX";
1136
bool tempdir_created = false;
2298
char *interfaces_to_take_down = NULL;
2299
size_t interfaces_to_take_down_size = 0;
2300
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2301
char old_tempdir[] = "/tmp/mandosXXXXXX";
2302
char *tempdir = NULL;
1137
2303
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1138
2304
const char *seckey = PATHDIR "/" SECKEY;
1139
2305
const char *pubkey = PATHDIR "/" PUBKEY;
2306
const char *dh_params_file = NULL;
2307
char *interfaces_hooks = NULL;
1140
2308
1141
2309
bool gnutls_initialized = false;
1142
2310
bool gpgme_initialized = false;
1143
2311
float delay = 2.5f;
2312
double retry_interval = 10; /* 10s between trying a server and
2313
retrying the same server again */
1144
2314
1145
2315
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
2316
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1152
2322
errno = 0;
1153
2323
ret = setgid(gid);
1154
2324
if(ret == -1){
1155
perror("setgid");
2325
perror_plus("setgid");
1156
2326
}
1157
2327
1158
2328
/* Lower user privileges (temporarily) */
1159
2329
errno = 0;
1160
2330
ret = seteuid(uid);
1161
2331
if(ret == -1){
1162
perror("seteuid");
2332
perror_plus("seteuid");
1163
2333
}
1164
2334
1165
2335
if(quit_now){
1192
2362
.doc = "Bit length of the prime number used in the"
1193
2363
" Diffie-Hellman key exchange",
1194
2364
.group = 2 },
2365
{ .name = "dh-params", .key = 134,
2366
.arg = "FILE",
2367
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2368
" for the Diffie-Hellman key exchange",
2369
.group = 2 },
1195
2370
{ .name = "priority", .key = 130,
1196
2371
.arg = "STRING",
1197
2372
.doc = "GnuTLS priority string for the TLS handshake",
1200
2375
.arg = "SECONDS",
1201
2376
.doc = "Maximum delay to wait for interface startup",
1202
2377
.group = 2 },
2378
{ .name = "retry", .key = 132,
2379
.arg = "SECONDS",
2380
.doc = "Retry interval used when denied by the Mandos server",
2381
.group = 2 },
2382
{ .name = "network-hook-dir", .key = 133,
2383
.arg = "DIR",
2384
.doc = "Directory where network hooks are located",
2385
.group = 2 },
1203
2386
/*
1204
2387
* These reproduce what we would get without ARGP_NO_HELP
1205
2388
*/
1223
2406
connect_to = arg;
1224
2407
break;
1225
2408
case 'i': /* --interface */
1226
interface = arg;
2409
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2410
arg, (int)',');
2411
if(ret_errno != 0){
2412
argp_error(state, "%s", strerror(ret_errno));
2413
}
1227
2414
break;
1228
2415
case 's': /* --seckey */
1229
2416
seckey = arg;
1240
2427
}
1241
2428
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1242
2429
break;
2430
case 134: /* --dh-params */
2431
dh_params_file = arg;
2432
break;
1243
2433
case 130: /* --priority */
1244
2434
mc.priority = arg;
1245
2435
break;
1249
2439
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
2440
argp_error(state, "Bad delay");
1251
2441
}
2442
case 132: /* --retry */
2443
errno = 0;
2444
retry_interval = strtod(arg, &tmp);
2445
if(errno != 0 or tmp == arg or *tmp != '\0'
2446
or (retry_interval * 1000) > INT_MAX
2447
or retry_interval < 0){
2448
argp_error(state, "Bad retry interval");
2449
}
2450
break;
2451
case 133: /* --network-hook-dir */
2452
hookdir = arg;
1252
2453
break;
1253
2454
/*
1254
2455
* These reproduce what we would get without ARGP_NO_HELP
1261
2462
argp_state_help(state, state->out_stream,
1262
2463
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
2464
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
2465
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1265
2466
exit(argp_err_exit_status);
1266
2467
break;
1267
2468
default:
1282
2483
case ENOMEM:
1283
2484
default:
1284
2485
errno = ret;
1285
perror("argp_parse");
2486
perror_plus("argp_parse");
1286
2487
exitcode = EX_OSERR;
1287
2488
goto end;
1288
2489
case EINVAL:
1291
2492
}
1292
2493
}
1293
2494
2495
{
2496
/* Work around Debian bug #633582:
2497
<http://bugs.debian.org/633582> */
2498
2499
/* Re-raise privileges */
2500
ret_errno = raise_privileges();
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2503
perror_plus("Failed to raise privileges");
2504
} else {
2505
struct stat st;
2506
2507
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2508
int seckey_fd = open(seckey, O_RDONLY);
2509
if(seckey_fd == -1){
2510
perror_plus("open");
2511
} else {
2512
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2513
if(ret == -1){
2514
perror_plus("fstat");
2515
} else {
2516
if(S_ISREG(st.st_mode)
2517
and st.st_uid == 0 and st.st_gid == 0){
2518
ret = fchown(seckey_fd, uid, gid);
2519
if(ret == -1){
2520
perror_plus("fchown");
2521
}
2522
}
2523
}
2524
TEMP_FAILURE_RETRY(close(seckey_fd));
2525
}
2526
}
2527
2528
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2529
int pubkey_fd = open(pubkey, O_RDONLY);
2530
if(pubkey_fd == -1){
2531
perror_plus("open");
2532
} else {
2533
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2534
if(ret == -1){
2535
perror_plus("fstat");
2536
} else {
2537
if(S_ISREG(st.st_mode)
2538
and st.st_uid == 0 and st.st_gid == 0){
2539
ret = fchown(pubkey_fd, uid, gid);
2540
if(ret == -1){
2541
perror_plus("fchown");
2542
}
2543
}
2544
}
2545
TEMP_FAILURE_RETRY(close(pubkey_fd));
2546
}
2547
}
2548
2549
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2550
int dhparams_fd = open(dh_params_file, O_RDONLY);
2551
if(dhparams_fd == -1){
2552
perror_plus("open");
2553
} else {
2554
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2555
if(ret == -1){
2556
perror_plus("fstat");
2557
} else {
2558
if(S_ISREG(st.st_mode)
2559
and st.st_uid == 0 and st.st_gid == 0){
2560
ret = fchown(dhparams_fd, uid, gid);
2561
if(ret == -1){
2562
perror_plus("fchown");
2563
}
2564
}
2565
}
2566
TEMP_FAILURE_RETRY(close(dhparams_fd));
2567
}
2568
}
2569
2570
/* Lower privileges */
2571
ret_errno = lower_privileges();
2572
if(ret_errno != 0){
2573
errno = ret_errno;
2574
perror_plus("Failed to lower privileges");
2575
}
2576
}
2577
}
2578
2579
/* Remove invalid interface names (except "none") */
2580
{
2581
char *interface = NULL;
2582
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2583
interface))){
2584
if(strcmp(interface, "none") != 0
2585
and if_nametoindex(interface) == 0){
2586
if(interface[0] != '\0'){
2587
fprintf_plus(stderr, "Not using nonexisting interface"
2588
" \"%s\"\n", interface);
2589
}
2590
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2591
interface = NULL;
2592
}
2593
}
2594
}
2595
2596
/* Run network hooks */
2597
{
2598
if(mc.interfaces != NULL){
2599
interfaces_hooks = malloc(mc.interfaces_size);
2600
if(interfaces_hooks == NULL){
2601
perror_plus("malloc");
2602
goto end;
2603
}
2604
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2605
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2606
}
2607
run_network_hooks("start", interfaces_hooks != NULL ?
2608
interfaces_hooks : "", delay);
2609
}
2610
1294
2611
if(not debug){
1295
2612
avahi_set_log_function(empty_log);
1296
2613
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
}
1322
2614
1323
2615
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
2616
from the signal handler */
1325
2617
/* Initialize the pseudo-RNG for Avahi */
1326
2618
srand((unsigned int) time(NULL));
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2619
simple_poll = avahi_simple_poll_new();
2620
if(simple_poll == NULL){
2621
fprintf_plus(stderr,
2622
"Avahi: Failed to create simple poll object.\n");
1330
2623
exitcode = EX_UNAVAILABLE;
1331
2624
goto end;
1332
2625
}
1334
2627
sigemptyset(&sigterm_action.sa_mask);
1335
2628
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
2629
if(ret == -1){
1337
perror("sigaddset");
2630
perror_plus("sigaddset");
1338
2631
exitcode = EX_OSERR;
1339
2632
goto end;
1340
2633
}
1341
2634
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
2635
if(ret == -1){
1343
perror("sigaddset");
2636
perror_plus("sigaddset");
1344
2637
exitcode = EX_OSERR;
1345
2638
goto end;
1346
2639
}
1347
2640
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
2641
if(ret == -1){
1349
perror("sigaddset");
2642
perror_plus("sigaddset");
1350
2643
exitcode = EX_OSERR;
1351
2644
goto end;
1352
2645
}
1356
2649
*/
1357
2650
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
2651
if(ret == -1){
1359
perror("sigaction");
2652
perror_plus("sigaction");
1360
2653
return EX_OSERR;
1361
2654
}
1362
2655
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
2656
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
2657
if(ret == -1){
1365
perror("sigaction");
2658
perror_plus("sigaction");
1366
2659
exitcode = EX_OSERR;
1367
2660
goto end;
1368
2661
}
1369
2662
}
1370
2663
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
2664
if(ret == -1){
1372
perror("sigaction");
2665
perror_plus("sigaction");
1373
2666
return EX_OSERR;
1374
2667
}
1375
2668
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
2669
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
2670
if(ret == -1){
1378
perror("sigaction");
2671
perror_plus("sigaction");
1379
2672
exitcode = EX_OSERR;
1380
2673
goto end;
1381
2674
}
1382
2675
}
1383
2676
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
2677
if(ret == -1){
1385
perror("sigaction");
2678
perror_plus("sigaction");
1386
2679
return EX_OSERR;
1387
2680
}
1388
2681
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
2682
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
2683
if(ret == -1){
1391
perror("sigaction");
1392
exitcode = EX_OSERR;
1393
goto end;
1394
}
1395
}
1396
1397
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1417
#ifdef __linux__
1418
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1420
ret = klogctl(8, NULL, 5);
1421
bool restore_loglevel = true;
1422
if(ret == -1){
1423
restore_loglevel = false;
1424
perror("klogctl");
1425
}
1426
#endif /* __linux__ */
1427
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
if(sd < 0){
1430
perror("socket");
1431
exitcode = EX_OSERR;
1432
#ifdef __linux__
1433
if(restore_loglevel){
1434
ret = klogctl(7, NULL, 0);
1435
if(ret == -1){
1436
perror("klogctl");
1437
}
1438
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1446
goto end;
1447
}
1448
strcpy(network.ifr_name, interface);
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1452
#ifdef __linux__
1453
if(restore_loglevel){
1454
ret = klogctl(7, NULL, 0);
1455
if(ret == -1){
1456
perror("klogctl");
1457
}
1458
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1467
goto end;
1468
}
1469
if((network.ifr_flags & IFF_UP) == 0){
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1477
#ifdef __linux__
1478
if(restore_loglevel){
1479
ret = klogctl(7, NULL, 0);
1480
if(ret == -1){
1481
perror("klogctl");
2684
perror_plus("sigaction");
2685
exitcode = EX_OSERR;
2686
goto end;
2687
}
2688
}
2689
2690
/* If no interfaces were specified, make a list */
2691
if(mc.interfaces == NULL){
2692
struct dirent **direntries = NULL;
2693
/* Look for any good interfaces */
2694
ret = scandir(sys_class_net, &direntries, good_interface,
2695
alphasort);
2696
if(ret >= 1){
2697
/* Add all found interfaces to interfaces list */
2698
for(int i = 0; i < ret; ++i){
2699
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2700
direntries[i]->d_name);
2701
if(ret_errno != 0){
2702
errno = ret_errno;
2703
perror_plus("argz_add");
2704
free(direntries[i]);
2705
continue;
2706
}
2707
if(debug){
2708
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2709
direntries[i]->d_name);
2710
}
2711
free(direntries[i]);
2712
}
2713
free(direntries);
2714
} else {
2715
if(ret == 0){
2716
free(direntries);
2717
}
2718
fprintf_plus(stderr, "Could not find a network interface\n");
2719
exitcode = EXIT_FAILURE;
2720
goto end;
2721
}
2722
}
2723
2724
/* Bring up interfaces which are down, and remove any "none"s */
2725
{
2726
char *interface = NULL;
2727
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2728
interface))){
2729
/* If interface name is "none", stop bringing up interfaces.
2730
Also remove all instances of "none" from the list */
2731
if(strcmp(interface, "none") == 0){
2732
argz_delete(&mc.interfaces, &mc.interfaces_size,
2733
interface);
2734
interface = NULL;
2735
while((interface = argz_next(mc.interfaces,
2736
mc.interfaces_size, interface))){
2737
if(strcmp(interface, "none") == 0){
2738
argz_delete(&mc.interfaces, &mc.interfaces_size,
2739
interface);
2740
interface = NULL;
1482
2741
}
1483
2742
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1491
goto end;
1492
}
1493
}
1494
/* sleep checking until interface is running */
1495
for(int i=0; i < delay * 4; i++){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_RUNNING){
1500
2743
break;
1501
2744
}
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
ret = nanosleep(&sleeptime, NULL);
1504
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1506
}
1507
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1514
}
1515
#ifdef __linux__
1516
if(restore_loglevel){
1517
/* Restores kernel loglevel to default */
1518
ret = klogctl(7, NULL, 0);
1519
if(ret == -1){
1520
perror("klogctl");
1521
}
1522
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
1532
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
1538
}
2745
bool interface_was_up = interface_is_up(interface);
2746
errno = bring_up_interface(interface, delay);
2747
if(not interface_was_up){
2748
if(errno != 0){
2749
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2750
" %s\n", interface, strerror(errno));
2751
} else {
2752
errno = argz_add(&interfaces_to_take_down,
2753
&interfaces_to_take_down_size,
2754
interface);
2755
if(errno != 0){
2756
perror_plus("argz_add");
2757
}
2758
}
2759
}
2760
}
2761
if(debug and (interfaces_to_take_down == NULL)){
2762
fprintf_plus(stderr, "No interfaces were brought up\n");
2763
}
2764
}
2765
2766
/* If we only got one interface, explicitly use only that one */
2767
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2768
if(debug){
2769
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2770
mc.interfaces);
2771
}
2772
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1539
2773
}
1540
2774
1541
2775
if(quit_now){
1542
2776
goto end;
1543
2777
}
1544
2778
1545
ret = init_gnutls_global(pubkey, seckey);
2779
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1546
2780
if(ret == -1){
1547
fprintf(stderr, "init_gnutls_global failed\n");
2781
fprintf_plus(stderr, "init_gnutls_global failed\n");
1548
2782
exitcode = EX_UNAVAILABLE;
1549
2783
goto end;
1550
2784
} else {
1555
2789
goto end;
1556
2790
}
1557
2791
1558
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
2792
/* Try /run/tmp before /tmp */
2793
tempdir = mkdtemp(run_tempdir);
2794
if(tempdir == NULL and errno == ENOENT){
2795
if(debug){
2796
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2797
run_tempdir, old_tempdir);
2798
}
2799
tempdir = mkdtemp(old_tempdir);
2800
}
2801
if(tempdir == NULL){
2802
perror_plus("mkdtemp");
1562
2803
goto end;
1563
2804
}
1564
2805
1566
2807
goto end;
1567
2808
}
1568
2809
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2810
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2811
fprintf_plus(stderr, "init_gpgme failed\n");
1571
2812
exitcode = EX_UNAVAILABLE;
1572
2813
goto end;
1573
2814
} else {
1582
2823
/* Connect directly, do not use Zeroconf */
1583
2824
/* (Mainly meant for debugging) */
1584
2825
char *address = strrchr(connect_to, ':');
2826
1585
2827
if(address == NULL){
1586
fprintf(stderr, "No colon in address\n");
2828
fprintf_plus(stderr, "No colon in address\n");
1587
2829
exitcode = EX_USAGE;
1588
2830
goto end;
1589
2831
}
1592
2834
goto end;
1593
2835
}
1594
2836
1595
uint16_t port;
2837
in_port_t port;
1596
2838
errno = 0;
1597
2839
tmpmax = strtoimax(address+1, &tmp, 10);
1598
2840
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2841
or tmpmax != (in_port_t)tmpmax){
2842
fprintf_plus(stderr, "Bad port number\n");
1601
2843
exitcode = EX_USAGE;
1602
2844
goto end;
1603
2845
}
1604
2846
1605
2847
if(quit_now){
1606
2848
goto end;
1607
2849
}
1608
2850
1609
port = (uint16_t)tmpmax;
2851
port = (in_port_t)tmpmax;
1610
2852
*address = '\0';
1611
address = connect_to;
1612
2853
/* Colon in address indicates IPv6 */
1613
2854
int af;
1614
if(strchr(address, ':') != NULL){
2855
if(strchr(connect_to, ':') != NULL){
1615
2856
af = AF_INET6;
2857
/* Accept [] around IPv6 address - see RFC 5952 */
2858
if(connect_to[0] == '[' and address[-1] == ']')
2859
{
2860
connect_to++;
2861
address[-1] = '\0';
2862
}
1616
2863
} else {
1617
2864
af = AF_INET;
1618
2865
}
2866
address = connect_to;
1619
2867
1620
2868
if(quit_now){
1621
2869
goto end;
1622
2870
}
1623
2871
1624
2872
while(not quit_now){
1625
ret = start_mandos_communication(address, port, if_index, af);
2873
ret = start_mandos_communication(address, port, if_index, af,
2874
&mc);
1626
2875
if(quit_now or ret == 0){
1627
2876
break;
1628
2877
}
1629
sleep(15);
1630
};
1631
1632
if (not quit_now){
2878
if(debug){
2879
fprintf_plus(stderr, "Retrying in %d seconds\n",
2880
(int)retry_interval);
2881
}
2882
sleep((unsigned int)retry_interval);
2883
}
2884
2885
if(not quit_now){
1633
2886
exitcode = EXIT_SUCCESS;
1634
2887
}
1635
2888
1636
2889
goto end;
1637
2890
}
1638
2891
1650
2903
config.publish_domain = 0;
1651
2904
1652
2905
/* Allocate a new server */
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
2906
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2907
&config, NULL, NULL, &ret_errno);
1656
2908
1657
2909
/* Free the Avahi configuration data */
1658
2910
avahi_server_config_free(&config);
1660
2912
1661
2913
/* Check if creating the Avahi server object succeeded */
1662
2914
if(mc.server == NULL){
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2915
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2916
avahi_strerror(ret_errno));
1665
2917
exitcode = EX_UNAVAILABLE;
1666
2918
goto end;
1667
2919
}
1673
2925
/* Create the Avahi service browser */
1674
2926
sb = avahi_s_service_browser_new(mc.server, if_index,
1675
2927
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1676
NULL, 0, browse_callback, NULL);
2928
NULL, 0, browse_callback,
2929
(void *)&mc);
1677
2930
if(sb == NULL){
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2931
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2932
avahi_strerror(avahi_server_errno(mc.server)));
1680
2933
exitcode = EX_UNAVAILABLE;
1681
2934
goto end;
1682
2935
}
1688
2941
/* Run the main loop */
1689
2942
1690
2943
if(debug){
1691
fprintf(stderr, "Starting Avahi loop search\n");
2944
fprintf_plus(stderr, "Starting Avahi loop search\n");
1692
2945
}
1693
2946
1694
avahi_simple_poll_loop(mc.simple_poll);
2947
ret = avahi_loop_with_timeout(simple_poll,
2948
(int)(retry_interval * 1000), &mc);
2949
if(debug){
2950
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2951
(ret == 0) ? "successfully" : "with error");
2952
}
1695
2953
1696
2954
end:
1697
2955
1698
2956
if(debug){
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2957
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1700
2958
}
1701
2959
1702
2960
/* Cleanup things */
2961
free(mc.interfaces);
2962
1703
2963
if(sb != NULL)
1704
2964
avahi_s_service_browser_free(sb);
1705
2965
1706
2966
if(mc.server != NULL)
1707
2967
avahi_server_free(mc.server);
1708
2968
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
2969
if(simple_poll != NULL)
2970
avahi_simple_poll_free(simple_poll);
1711
2971
1712
2972
if(gnutls_initialized){
1713
2973
gnutls_certificate_free_credentials(mc.cred);
1719
2979
gpgme_release(mc.ctx);
1720
2980
}
1721
2981
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
1729
}
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1739
}
1740
}
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
1750
}
1751
}
1752
}
1753
1754
/* Removes the temp directory used by GPGME */
1755
if(tempdir_created){
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
1776
char *fullname = NULL;
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
direntry->d_name);
1779
if(ret < 0){
1780
perror("asprintf");
1781
continue;
1782
}
1783
ret = remove(fullname);
1784
if(ret == -1){
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
1787
}
1788
free(fullname);
1789
}
1790
closedir(d);
1791
}
1792
ret = rmdir(tempdir);
1793
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
2982
/* Cleans up the circular linked list of Mandos servers the client
2983
has seen */
2984
if(mc.current_server != NULL){
2985
mc.current_server->prev->next = NULL;
2986
while(mc.current_server != NULL){
2987
server *next = mc.current_server->next;
2988
#ifdef __GNUC__
2989
#pragma GCC diagnostic push
2990
#pragma GCC diagnostic ignored "-Wcast-qual"
2991
#endif
2992
free((char *)(mc.current_server->ip));
2993
#ifdef __GNUC__
2994
#pragma GCC diagnostic pop
2995
#endif
2996
free(mc.current_server);
2997
mc.current_server = next;
2998
}
2999
}
3000
3001
/* Re-raise privileges */
3002
{
3003
ret_errno = raise_privileges();
3004
if(ret_errno != 0){
3005
errno = ret_errno;
3006
perror_plus("Failed to raise privileges");
3007
} else {
3008
3009
/* Run network hooks */
3010
run_network_hooks("stop", interfaces_hooks != NULL ?
3011
interfaces_hooks : "", delay);
3012
3013
/* Take down the network interfaces which were brought up */
3014
{
3015
char *interface = NULL;
3016
while((interface=argz_next(interfaces_to_take_down,
3017
interfaces_to_take_down_size,
3018
interface))){
3019
ret_errno = take_down_interface(interface);
3020
if(ret_errno != 0){
3021
errno = ret_errno;
3022
perror_plus("Failed to take down interface");
3023
}
3024
}
3025
if(debug and (interfaces_to_take_down == NULL)){
3026
fprintf_plus(stderr, "No interfaces needed to be taken"
3027
" down\n");
3028
}
3029
}
3030
}
3031
3032
ret_errno = lower_privileges_permanently();
3033
if(ret_errno != 0){
3034
errno = ret_errno;
3035
perror_plus("Failed to lower privileges permanently");
3036
}
3037
}
3038
3039
free(interfaces_to_take_down);
3040
free(interfaces_hooks);
3041
3042
/* Removes the GPGME temp directory and all files inside */
3043
if(tempdir != NULL){
3044
struct dirent **direntries = NULL;
3045
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3046
| O_NOFOLLOW
3047
| O_DIRECTORY
3048
| O_PATH));
3049
if(tempdir_fd == -1){
3050
perror_plus("open");
3051
} else {
3052
#ifdef __GLIBC__
3053
#if __GLIBC_PREREQ(2, 15)
3054
int numentries = scandirat(tempdir_fd, ".", &direntries,
3055
notdotentries, alphasort);
3056
#else /* not __GLIBC_PREREQ(2, 15) */
3057
int numentries = scandir(tempdir, &direntries, notdotentries,
3058
alphasort);
3059
#endif /* not __GLIBC_PREREQ(2, 15) */
3060
#else /* not __GLIBC__ */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC__ */
3064
if(numentries >= 0){
3065
for(int i = 0; i < numentries; i++){
3066
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3067
if(ret == -1){
3068
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3069
" \"%s\", 0): %s\n", tempdir,
3070
direntries[i]->d_name, strerror(errno));
3071
}
3072
free(direntries[i]);
3073
}
3074
3075
/* need to clean even if 0 because man page doesn't specify */
3076
free(direntries);
3077
if(numentries == -1){
3078
perror_plus("scandir");
3079
}
3080
ret = rmdir(tempdir);
3081
if(ret == -1 and errno != ENOENT){
3082
perror_plus("rmdir");
3083
}
3084
}
3085
TEMP_FAILURE_RETRY(close(tempdir_fd));
1795
3086
}
1796
3087
}
1797
3088
1802
3093
&old_sigterm_action,
1803
3094
NULL));
1804
3095
if(ret == -1){
1805
perror("sigaction");
3096
perror_plus("sigaction");
1806
3097
}
1807
3098
do {
1808
3099
ret = raise(signal_received);
1809
3100
} while(ret != 0 and errno == EINTR);
1810
3101
if(ret != 0){
1811
perror("raise");
3102
perror_plus("raise");
1812
3103
abort();
1813
3104
}
1814
3105
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0