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- Committer: Teddy Hogeborn
- Date: 2011-03-08 19:12:56 UTC
- mfrom: (237.7.20 trunk)
- Revision ID: teddy@fukt.bsnet.se-20110308191256-mjcukty9on3z0yhd
Merge from trunk.
- files removed:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
79
77
#include <iso646.h> /* not, or, and */
80
78
#include <argp.h> /* struct argp_option, error_t, struct
81
79
argp_state, struct argp,
86
84
raise() */
87
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
86
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() */
98
87
99
88
#ifdef __linux__
100
89
#include <sys/klog.h> /* klogctl() */
118
107
init_gnutls_session(),
119
108
GNUTLS_* */
120
109
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
123
112
124
113
/* GPGME */
125
114
#include <gpgme.h> /* All GPGME types, constants and
133
122
#define PATHDIR "/conf/conf.d/mandos"
134
123
#define SECKEY "seckey.txt"
135
124
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
125
138
126
bool debug = false;
139
127
static const char mandos_protocol_version[] = "1";
140
128
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
142
130
static const char sys_class_net[] = "/sys/class/net";
143
131
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;
159
132
160
133
/* Used for passing in values through the Avahi callback functions */
161
134
typedef struct {
135
AvahiSimplePoll *simple_poll;
162
136
AvahiServer *server;
163
137
gnutls_certificate_credentials_t cred;
164
138
unsigned int dh_bits;
165
139
gnutls_dh_params_t dh_params;
166
140
const char *priority;
167
141
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
142
} mandos_context;
172
143
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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" };
175
148
176
149
sig_atomic_t quit_now = 0;
177
150
int signal_received = 0;
178
151
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
198
152
/*
199
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
154
* bytes. "buffer_capacity" is how much is currently allocated,
201
155
* "buffer_length" is how much is already used.
202
156
*/
203
__attribute__((nonnull, warn_unused_result))
204
157
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
158
size_t buffer_capacity){
206
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
213
162
return 0;
214
163
}
215
*buffer = new_buf;
216
164
buffer_capacity += BUFFER_SIZE;
217
165
}
218
166
return buffer_capacity;
219
167
}
220
168
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
269
169
/*
270
170
* Initialize GPGME.
271
171
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
277
174
gpgme_error_t rc;
278
175
gpgme_engine_info_t engine_info;
279
176
177
280
178
/*
281
179
* Helper function to insert pub and seckey to the engine keyring.
282
180
*/
283
bool import_key(const char * const filename){
181
bool import_key(const char *filename){
284
182
int ret;
285
183
int fd;
286
184
gpgme_data_t pgp_data;
287
185
288
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
187
if(fd == -1){
290
perror_plus("open");
188
perror("open");
291
189
return false;
292
190
}
293
191
294
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
193
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
298
196
return false;
299
197
}
300
198
301
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
302
200
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
305
203
return false;
306
204
}
307
205
308
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
207
if(ret == -1){
310
perror_plus("close");
208
perror("close");
311
209
}
312
210
gpgme_data_release(pgp_data);
313
211
return true;
314
212
}
315
213
316
214
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
318
216
}
319
217
320
218
/* Init GPGME */
321
219
gpgme_check_version(NULL);
322
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
221
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
326
224
return false;
327
225
}
328
226
329
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
330
228
rc = gpgme_get_engine_info(&engine_info);
331
229
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
334
232
return false;
335
233
}
336
234
while(engine_info != NULL){
342
240
engine_info = engine_info->next;
343
241
}
344
242
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
244
return false;
348
245
}
349
246
350
247
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
352
249
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
356
252
return false;
357
253
}
358
254
367
263
* Decrypt OpenPGP data.
368
264
* Returns -1 on error
369
265
*/
370
__attribute__((nonnull, warn_unused_result))
371
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
267
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
268
char **plaintext){
375
269
gpgme_data_t dh_crypto, dh_plain;
376
270
gpgme_error_t rc;
377
271
ssize_t ret;
379
273
ssize_t plaintext_length = 0;
380
274
381
275
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
277
}
384
278
385
279
/* Create new GPGME data buffer from memory cryptotext */
386
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
281
0);
388
282
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
391
285
return -1;
392
286
}
393
287
394
288
/* Create new empty GPGME data buffer for the plaintext */
395
289
rc = gpgme_data_new(&dh_plain);
396
290
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
400
293
gpgme_data_release(dh_crypto);
401
294
return -1;
402
295
}
403
296
404
297
/* Decrypt data from the cryptotext data buffer to the plaintext
405
298
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
300
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
410
303
plaintext_length = -1;
411
304
if(debug){
412
305
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
414
307
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
309
} else {
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);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
421
314
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
423
316
}
424
317
gpgme_recipient_t recipient;
425
318
recipient = result->recipients;
426
319
while(recipient != NULL){
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");
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");
434
326
recipient = recipient->next;
435
327
}
436
328
}
439
331
}
440
332
441
333
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
335
}
444
336
445
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
448
340
plaintext_length = -1;
449
341
goto decrypt_end;
450
342
}
452
344
*plaintext = NULL;
453
345
while(true){
454
346
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
457
349
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
461
353
}
462
354
463
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
468
360
break;
469
361
}
470
362
if(ret < 0){
471
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
472
364
plaintext_length = -1;
473
365
goto decrypt_end;
474
366
}
476
368
}
477
369
478
370
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
480
372
for(ssize_t i = 0; i < plaintext_length; i++){
481
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
374
}
493
385
return plaintext_length;
494
386
}
495
387
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
499
391
if(ret == NULL)
500
392
ret = "(unknown)";
501
393
return ret;
502
394
}
503
395
504
396
/* GnuTLS log function callback */
505
__attribute__((nonnull))
506
397
static void debuggnutls(__attribute__((unused)) int level,
507
398
const char* string){
508
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
509
400
}
510
401
511
__attribute__((nonnull, warn_unused_result))
512
402
static int init_gnutls_global(const char *pubkeyfilename,
513
const char *seckeyfilename,
514
mandos_context *mc){
403
const char *seckeyfilename){
515
404
int ret;
516
405
517
406
if(debug){
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
519
408
}
520
409
521
410
ret = gnutls_global_init();
522
411
if(ret != GNUTLS_E_SUCCESS){
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
525
414
return -1;
526
415
}
527
416
534
423
}
535
424
536
425
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
538
427
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
541
433
gnutls_global_deinit();
542
434
return -1;
543
435
}
544
436
545
437
if(debug){
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
550
441
}
551
442
552
443
ret = gnutls_certificate_set_openpgp_key_file
553
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
554
445
GNUTLS_OPENPGP_FMT_BASE64);
555
446
if(ret != GNUTLS_E_SUCCESS){
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
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));
561
452
goto globalfail;
562
453
}
563
454
564
455
/* GnuTLS server initialization */
565
ret = gnutls_dh_params_init(&mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
566
457
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
570
460
goto globalfail;
571
461
}
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
573
463
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
576
466
goto globalfail;
577
467
}
578
468
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
580
470
581
471
return 0;
582
472
583
473
globalfail:
584
474
585
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
586
476
gnutls_global_deinit();
587
gnutls_dh_params_deinit(mc->dh_params);
477
gnutls_dh_params_deinit(mc.dh_params);
588
478
return -1;
589
479
}
590
480
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
481
static int init_gnutls_session(gnutls_session_t *session){
594
482
int ret;
595
483
/* GnuTLS session creation */
596
484
do {
600
488
}
601
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
490
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
606
493
}
607
494
608
495
{
609
496
const char *err;
610
497
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
612
499
if(quit_now){
613
500
gnutls_deinit(*session);
614
501
return -1;
615
502
}
616
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
617
504
if(ret != GNUTLS_E_SUCCESS){
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
621
508
gnutls_deinit(*session);
622
509
return -1;
623
510
}
625
512
626
513
do {
627
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
515
mc.cred);
629
516
if(quit_now){
630
517
gnutls_deinit(*session);
631
518
return -1;
632
519
}
633
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
634
521
if(ret != GNUTLS_E_SUCCESS){
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
637
524
gnutls_deinit(*session);
638
525
return -1;
639
526
}
641
528
/* ignore client certificate if any. */
642
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
643
530
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
645
532
646
533
return 0;
647
534
}
651
538
__attribute__((unused)) const char *txt){}
652
539
653
540
/* Called when a Mandos server is found */
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
541
static int start_mandos_communication(const char *ip, uint16_t port,
656
542
AvahiIfIndex if_index,
657
int af, mandos_context *mc){
543
int af){
658
544
int ret, tcp_sd = -1;
659
545
ssize_t sret;
660
struct sockaddr_storage to;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
661
550
char *buffer = NULL;
662
551
char *decrypted_buffer = NULL;
663
552
size_t buffer_length = 0;
682
571
pf = PF_INET;
683
572
break;
684
573
default:
685
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
686
575
errno = EINVAL;
687
576
return -1;
688
577
}
689
578
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
579
ret = init_gnutls_session(&session);
723
580
if(ret != 0){
724
581
return -1;
725
582
}
726
583
727
584
if(debug){
728
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
730
587
}
731
588
732
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
733
590
if(tcp_sd < 0){
734
591
int e = errno;
735
perror_plus("socket");
592
perror("socket");
736
593
errno = e;
737
594
goto mandos_end;
738
595
}
744
601
745
602
memset(&to, 0, sizeof(to));
746
603
if(af == AF_INET6){
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
749
606
} else { /* IPv4 */
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
752
609
}
753
610
if(ret < 0 ){
754
611
int e = errno;
755
perror_plus("inet_pton");
612
perror("inet_pton");
756
613
errno = e;
757
614
goto mandos_end;
758
615
}
759
616
if(ret == 0){
760
617
int e = errno;
761
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
762
619
errno = e;
763
620
goto mandos_end;
764
621
}
765
622
if(af == AF_INET6){
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
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*/
769
630
if(if_index == AVAHI_IF_UNSPEC){
770
fprintf_plus(stderr, "An IPv6 link-local address is"
771
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
772
633
errno = EINVAL;
773
634
goto mandos_end;
774
635
}
775
636
/* Set the network interface number as scope */
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
637
to.in6.sin6_scope_id = (uint32_t)if_index;
777
638
}
778
639
} else {
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
780
643
}
781
644
782
645
if(quit_now){
788
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
789
652
char interface[IF_NAMESIZE];
790
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
perror_plus("if_indextoname");
654
perror("if_indextoname");
792
655
} else {
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
795
658
}
796
659
} else {
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
799
662
}
800
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
802
666
if(af == AF_INET6){
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
807
669
} else {
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
812
672
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
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
}
819
679
}
820
680
}
821
681
825
685
}
826
686
827
687
if(af == AF_INET6){
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
830
689
} else {
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
833
691
}
834
692
if(ret < 0){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
694
int e = errno;
837
perror_plus("connect");
695
perror("connect");
838
696
errno = e;
839
697
}
840
698
goto mandos_end;
850
708
while(true){
851
709
size_t out_size = strlen(out);
852
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
853
out_size - written));
711
out_size - written));
854
712
if(ret == -1){
855
713
int e = errno;
856
perror_plus("write");
714
perror("write");
857
715
errno = e;
858
716
goto mandos_end;
859
717
}
876
734
}
877
735
878
736
if(debug){
879
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
880
738
}
881
739
882
740
if(quit_now){
884
742
goto mandos_end;
885
743
}
886
744
887
/* This casting via intptr_t is to eliminate warning about casting
888
an int to a pointer type. This is exactly how the GnuTLS Guile
889
function "set-session-transport-fd!" does it. */
890
gnutls_transport_set_ptr(session,
891
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
892
746
893
747
if(quit_now){
894
748
errno = EINTR;
905
759
906
760
if(ret != GNUTLS_E_SUCCESS){
907
761
if(debug){
908
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
909
763
gnutls_perror(ret);
910
764
}
911
765
errno = EPROTO;
915
769
/* Read OpenPGP packet that contains the wanted password */
916
770
917
771
if(debug){
918
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
919
" %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
920
774
}
921
775
922
776
while(true){
927
781
}
928
782
929
783
buffer_capacity = incbuffer(&buffer, buffer_length,
930
buffer_capacity);
784
buffer_capacity);
931
785
if(buffer_capacity == 0){
932
786
int e = errno;
933
perror_plus("incbuffer");
787
perror("incbuffer");
934
788
errno = e;
935
789
goto mandos_end;
936
790
}
960
814
}
961
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
962
816
if(ret < 0){
963
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
964
"***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
965
818
gnutls_perror(ret);
966
819
errno = EPROTO;
967
820
goto mandos_end;
968
821
}
969
822
break;
970
823
default:
971
fprintf_plus(stderr, "Unknown error while reading data from"
972
" encrypted session with Mandos server\n");
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
973
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
974
827
errno = EIO;
975
828
goto mandos_end;
980
833
}
981
834
982
835
if(debug){
983
fprintf_plus(stderr, "Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
984
837
}
985
838
986
839
if(quit_now){
998
851
999
852
if(buffer_length > 0){
1000
853
ssize_t decrypted_buffer_size;
1001
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
856
&decrypted_buffer);
1003
857
if(decrypted_buffer_size >= 0){
1004
858
1005
859
written = 0;
1015
869
if(ret == 0 and ferror(stdout)){
1016
870
int e = errno;
1017
871
if(debug){
1018
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1019
strerror(errno));
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
1020
874
}
1021
875
errno = e;
1022
876
goto mandos_end;
1041
895
if(e == 0){
1042
896
e = errno;
1043
897
}
1044
perror_plus("close");
898
perror("close");
1045
899
}
1046
900
gnutls_deinit(session);
1047
errno = e;
1048
901
if(quit_now){
1049
errno = EINTR;
902
e = EINTR;
1050
903
retval = -1;
1051
904
}
905
errno = e;
1052
906
}
1053
907
return retval;
1054
908
}
1055
909
1056
__attribute__((nonnull))
1057
910
static void resolve_callback(AvahiSServiceResolver *r,
1058
911
AvahiIfIndex interface,
1059
912
AvahiProtocol proto,
1067
920
AVAHI_GCC_UNUSED AvahiStringList *txt,
1068
921
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1069
922
flags,
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
1074
925
1075
926
/* Called whenever a service has been resolved successfully or
1076
927
timed out */
1082
933
switch(event){
1083
934
default:
1084
935
case AVAHI_RESOLVER_FAILURE:
1085
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1086
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1087
domain,
1088
avahi_strerror(avahi_server_errno
1089
(((mandos_context*)mc)->server)));
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)));
1090
939
break;
1091
940
1092
941
case AVAHI_RESOLVER_FOUND:
1094
943
char ip[AVAHI_ADDRESS_STR_MAX];
1095
944
avahi_address_snprint(ip, sizeof(ip), address);
1096
945
if(debug){
1097
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1098
PRIdMAX ") on port %" PRIu16 "\n", name,
1099
host_name, ip, (intmax_t)interface, port);
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);
1100
949
}
1101
int ret = start_mandos_communication(ip, (in_port_t)port,
1102
interface,
1103
avahi_proto_to_af(proto),
1104
mc);
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
1105
952
if(ret == 0){
1106
avahi_simple_poll_quit(simple_poll);
1107
} else {
1108
if(not add_server(ip, (in_port_t)port, interface,
1109
avahi_proto_to_af(proto),
1110
&((mandos_context*)mc)->current_server)){
1111
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1112
" list\n", name);
1113
}
953
avahi_simple_poll_quit(mc.simple_poll);
1114
954
}
1115
955
}
1116
956
}
1126
966
const char *domain,
1127
967
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1128
968
flags,
1129
void *mc){
1130
if(b == NULL){
1131
return;
1132
}
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
1133
971
1134
972
/* Called whenever a new services becomes available on the LAN or
1135
973
is removed from the LAN */
1142
980
default:
1143
981
case AVAHI_BROWSER_FAILURE:
1144
982
1145
fprintf_plus(stderr, "(Avahi browser) %s\n",
1146
avahi_strerror(avahi_server_errno
1147
(((mandos_context*)mc)->server)));
1148
avahi_simple_poll_quit(simple_poll);
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1149
986
return;
1150
987
1151
988
case AVAHI_BROWSER_NEW:
1154
991
the callback function is called the Avahi server will free the
1155
992
resolver for us. */
1156
993
1157
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1158
interface, protocol, name, type,
1159
domain, protocol, 0,
1160
resolve_callback, mc) == NULL)
1161
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1162
" %s\n", name,
1163
avahi_strerror(avahi_server_errno
1164
(((mandos_context*)mc)->server)));
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)));
1165
999
break;
1166
1000
1167
1001
case AVAHI_BROWSER_REMOVE:
1170
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1171
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1172
1006
if(debug){
1173
fprintf_plus(stderr, "No Mandos server found, still"
1174
" searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1175
1008
}
1176
1009
break;
1177
1010
}
1178
1011
}
1179
1012
1180
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1181
1014
static void handle_sigterm(int sig){
1182
1015
if(quit_now){
1183
1016
return;
1185
1018
quit_now = 1;
1186
1019
signal_received = sig;
1187
1020
int old_errno = errno;
1188
/* set main loop to exit */
1189
if(simple_poll != NULL){
1190
avahi_simple_poll_quit(simple_poll);
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1191
1023
}
1192
1024
errno = old_errno;
1193
1025
}
1194
1026
1195
__attribute__((nonnull, warn_unused_result))
1196
bool get_flags(const char *ifname, struct ifreq *ifr){
1197
int ret;
1198
error_t ret_errno;
1199
1200
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1201
if(s < 0){
1202
ret_errno = errno;
1203
perror_plus("socket");
1204
errno = ret_errno;
1205
return false;
1206
}
1207
strcpy(ifr->ifr_name, ifname);
1208
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1209
if(ret == -1){
1210
if(debug){
1211
ret_errno = errno;
1212
perror_plus("ioctl SIOCGIFFLAGS");
1213
errno = ret_errno;
1214
}
1215
return false;
1216
}
1217
return true;
1218
}
1219
1220
__attribute__((nonnull, warn_unused_result))
1221
bool good_flags(const char *ifname, const struct ifreq *ifr){
1222
1223
/* Reject the loopback device */
1224
if(ifr->ifr_flags & IFF_LOOPBACK){
1225
if(debug){
1226
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1227
ifname);
1228
}
1229
return false;
1230
}
1231
/* Accept point-to-point devices only if connect_to is specified */
1232
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1233
if(debug){
1234
fprintf_plus(stderr, "Accepting point-to-point interface"
1235
" \"%s\"\n", ifname);
1236
}
1237
return true;
1238
}
1239
/* Otherwise, reject non-broadcast-capable devices */
1240
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1241
if(debug){
1242
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1243
" \"%s\"\n", ifname);
1244
}
1245
return false;
1246
}
1247
/* Reject non-ARP interfaces (including dummy interfaces) */
1248
if(ifr->ifr_flags & IFF_NOARP){
1249
if(debug){
1250
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1251
ifname);
1252
}
1253
return false;
1254
}
1255
1256
/* Accept this device */
1257
if(debug){
1258
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1259
}
1260
return true;
1261
}
1262
1263
1027
/*
1264
1028
* This function determines if a directory entry in /sys/class/net
1265
1029
* corresponds to an acceptable network device.
1266
1030
* (This function is passed to scandir(3) as a filter function.)
1267
1031
*/
1268
__attribute__((nonnull, warn_unused_result))
1269
1032
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
}
1270
1041
if(if_entry->d_name[0] == '.'){
1271
1042
return 0;
1272
1043
}
1273
1274
struct ifreq ifr;
1275
if(not get_flags(if_entry->d_name, &ifr)){
1276
if(debug){
1277
fprintf_plus(stderr, "Failed to get flags for interface "
1278
"\"%s\"\n", if_entry->d_name);
1279
}
1280
return 0;
1281
}
1282
1283
if(not good_flags(if_entry->d_name, &ifr)){
1284
return 0;
1285
}
1286
return 1;
1287
}
1288
1289
/*
1290
* This function determines if a network interface is up.
1291
*/
1292
__attribute__((nonnull, warn_unused_result))
1293
bool interface_is_up(const char *interface){
1294
struct ifreq ifr;
1295
if(not get_flags(interface, &ifr)){
1296
if(debug){
1297
fprintf_plus(stderr, "Failed to get flags for interface "
1298
"\"%s\"\n", interface);
1299
}
1300
return false;
1301
}
1302
1303
return (bool)(ifr.ifr_flags & IFF_UP);
1304
}
1305
1306
/*
1307
* This function determines if a network interface is running
1308
*/
1309
__attribute__((nonnull, warn_unused_result))
1310
bool interface_is_running(const char *interface){
1311
struct ifreq ifr;
1312
if(not get_flags(interface, &ifr)){
1313
if(debug){
1314
fprintf_plus(stderr, "Failed to get flags for interface "
1315
"\"%s\"\n", interface);
1316
}
1317
return false;
1318
}
1319
1320
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1321
}
1322
1323
__attribute__((nonnull, pure, warn_unused_result))
1324
int notdotentries(const struct dirent *direntry){
1325
/* Skip "." and ".." */
1326
if(direntry->d_name[0] == '.'
1327
and (direntry->d_name[1] == '\0'
1328
or (direntry->d_name[1] == '.'
1329
and direntry->d_name[2] == '\0'))){
1330
return 0;
1331
}
1332
return 1;
1333
}
1334
1335
/* Is this directory entry a runnable program? */
1336
__attribute__((nonnull, warn_unused_result))
1337
int runnable_hook(const struct dirent *direntry){
1338
int ret;
1339
size_t sret;
1340
struct stat st;
1341
1342
if((direntry->d_name)[0] == '\0'){
1343
/* Empty name? */
1344
return 0;
1345
}
1346
1347
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1348
"abcdefghijklmnopqrstuvwxyz"
1349
"0123456789"
1350
"_.-");
1351
if((direntry->d_name)[sret] != '\0'){
1352
/* Contains non-allowed characters */
1353
if(debug){
1354
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1355
direntry->d_name);
1356
}
1357
return 0;
1358
}
1359
1360
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1361
if(ret == -1){
1362
if(debug){
1363
perror_plus("Could not stat hook");
1364
}
1365
return 0;
1366
}
1367
if(not (S_ISREG(st.st_mode))){
1368
/* Not a regular file */
1369
if(debug){
1370
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1371
direntry->d_name);
1372
}
1373
return 0;
1374
}
1375
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1376
/* Not executable */
1377
if(debug){
1378
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1379
direntry->d_name);
1380
}
1381
return 0;
1382
}
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){
1070
break;
1071
}
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 */
1383
1115
if(debug){
1384
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1385
direntry->d_name);
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1386
1118
}
1387
1119
return 1;
1388
1120
}
1389
1121
1390
__attribute__((nonnull, warn_unused_result))
1391
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1392
mandos_context *mc){
1393
int ret;
1394
struct timespec now;
1395
struct timespec waited_time;
1396
intmax_t block_time;
1397
1398
while(true){
1399
if(mc->current_server == NULL){
1400
if(debug){
1401
fprintf_plus(stderr, "Wait until first server is found."
1402
" No timeout!\n");
1403
}
1404
ret = avahi_simple_poll_iterate(s, -1);
1405
} else {
1406
if(debug){
1407
fprintf_plus(stderr, "Check current_server if we should run"
1408
" it, or wait\n");
1409
}
1410
/* the current time */
1411
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1412
if(ret == -1){
1413
perror_plus("clock_gettime");
1414
return -1;
1415
}
1416
/* Calculating in ms how long time between now and server
1417
who we visted longest time ago. Now - last seen. */
1418
waited_time.tv_sec = (now.tv_sec
1419
- mc->current_server->last_seen.tv_sec);
1420
waited_time.tv_nsec = (now.tv_nsec
1421
- mc->current_server->last_seen.tv_nsec);
1422
/* total time is 10s/10,000ms.
1423
Converting to s from ms by dividing by 1,000,
1424
and ns to ms by dividing by 1,000,000. */
1425
block_time = ((retry_interval
1426
- ((intmax_t)waited_time.tv_sec * 1000))
1427
- ((intmax_t)waited_time.tv_nsec / 1000000));
1428
1429
if(debug){
1430
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1431
block_time);
1432
}
1433
1434
if(block_time <= 0){
1435
ret = start_mandos_communication(mc->current_server->ip,
1436
mc->current_server->port,
1437
mc->current_server->if_index,
1438
mc->current_server->af, mc);
1439
if(ret == 0){
1440
avahi_simple_poll_quit(s);
1441
return 0;
1442
}
1443
ret = clock_gettime(CLOCK_MONOTONIC,
1444
&mc->current_server->last_seen);
1445
if(ret == -1){
1446
perror_plus("clock_gettime");
1447
return -1;
1448
}
1449
mc->current_server = mc->current_server->next;
1450
block_time = 0; /* Call avahi to find new Mandos
1451
servers, but don't block */
1452
}
1453
1454
ret = avahi_simple_poll_iterate(s, (int)block_time);
1455
}
1456
if(ret != 0){
1457
if(ret > 0 or errno != EINTR){
1458
return (ret != 1) ? ret : 0;
1459
}
1460
}
1461
}
1462
}
1463
1464
/* Set effective uid to 0, return errno */
1465
__attribute__((warn_unused_result))
1466
error_t raise_privileges(void){
1467
error_t old_errno = errno;
1468
error_t ret_errno = 0;
1469
if(seteuid(0) == -1){
1470
ret_errno = errno;
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Set effective and real user ID to 0. Return errno. */
1477
__attribute__((warn_unused_result))
1478
error_t raise_privileges_permanently(void){
1479
error_t old_errno = errno;
1480
error_t ret_errno = raise_privileges();
1481
if(ret_errno != 0){
1482
errno = old_errno;
1483
return ret_errno;
1484
}
1485
if(setuid(0) == -1){
1486
ret_errno = errno;
1487
}
1488
errno = old_errno;
1489
return ret_errno;
1490
}
1491
1492
/* Set effective user ID to unprivileged saved user ID */
1493
__attribute__((warn_unused_result))
1494
error_t lower_privileges(void){
1495
error_t old_errno = errno;
1496
error_t ret_errno = 0;
1497
if(seteuid(uid) == -1){
1498
ret_errno = errno;
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
}
1512
errno = old_errno;
1513
return ret_errno;
1514
}
1515
1516
__attribute__((nonnull))
1517
void run_network_hooks(const char *mode, const char *interface,
1518
const float delay){
1519
struct dirent **direntries = NULL;
1520
if(hookdir_fd == -1){
1521
hookdir_fd = open(hookdir, O_RDONLY);
1522
if(hookdir_fd == -1){
1523
if(errno == ENOENT){
1524
if(debug){
1525
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1526
" found\n", hookdir);
1527
}
1528
} else {
1529
perror_plus("open");
1530
}
1531
return;
1532
}
1533
}
1534
#ifdef __GLIBC__
1535
#if __GLIBC_PREREQ(2, 15)
1536
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1537
runnable_hook, alphasort);
1538
#else /* not __GLIBC_PREREQ(2, 15) */
1539
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1540
alphasort);
1541
#endif /* not __GLIBC_PREREQ(2, 15) */
1542
#else /* not __GLIBC__ */
1543
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1544
alphasort);
1545
#endif /* not __GLIBC__ */
1546
if(numhooks == -1){
1547
perror_plus("scandir");
1548
return;
1549
}
1550
struct dirent *direntry;
1551
int ret;
1552
int devnull = open("/dev/null", O_RDONLY);
1553
for(int i = 0; i < numhooks; i++){
1554
direntry = direntries[i];
1555
if(debug){
1556
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1557
direntry->d_name);
1558
}
1559
pid_t hook_pid = fork();
1560
if(hook_pid == 0){
1561
/* Child */
1562
/* Raise privileges */
1563
errno = raise_privileges_permanently();
1564
if(errno != 0){
1565
perror_plus("Failed to raise privileges");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Set group */
1569
errno = 0;
1570
ret = setgid(0);
1571
if(ret == -1){
1572
perror_plus("setgid");
1573
_exit(EX_NOPERM);
1574
}
1575
/* Reset supplementary groups */
1576
errno = 0;
1577
ret = setgroups(0, NULL);
1578
if(ret == -1){
1579
perror_plus("setgroups");
1580
_exit(EX_NOPERM);
1581
}
1582
ret = dup2(devnull, STDIN_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(devnull, STDIN_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1587
ret = close(devnull);
1588
if(ret == -1){
1589
perror_plus("close");
1590
_exit(EX_OSERR);
1591
}
1592
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1593
if(ret == -1){
1594
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1595
_exit(EX_OSERR);
1596
}
1597
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1598
if(ret == -1){
1599
perror_plus("setenv");
1600
_exit(EX_OSERR);
1601
}
1602
ret = setenv("DEVICE", interface, 1);
1603
if(ret == -1){
1604
perror_plus("setenv");
1605
_exit(EX_OSERR);
1606
}
1607
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1608
if(ret == -1){
1609
perror_plus("setenv");
1610
_exit(EX_OSERR);
1611
}
1612
ret = setenv("MODE", mode, 1);
1613
if(ret == -1){
1614
perror_plus("setenv");
1615
_exit(EX_OSERR);
1616
}
1617
char *delaystring;
1618
ret = asprintf(&delaystring, "%f", (double)delay);
1619
if(ret == -1){
1620
perror_plus("asprintf");
1621
_exit(EX_OSERR);
1622
}
1623
ret = setenv("DELAY", delaystring, 1);
1624
if(ret == -1){
1625
free(delaystring);
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
free(delaystring);
1630
if(connect_to != NULL){
1631
ret = setenv("CONNECT", connect_to, 1);
1632
if(ret == -1){
1633
perror_plus("setenv");
1634
_exit(EX_OSERR);
1635
}
1636
}
1637
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1638
if(hook_fd == -1){
1639
perror_plus("openat");
1640
_exit(EXIT_FAILURE);
1641
}
1642
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1643
perror_plus("close");
1644
_exit(EXIT_FAILURE);
1645
}
1646
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1647
environ) == -1){
1648
perror_plus("fexecve");
1649
_exit(EXIT_FAILURE);
1650
}
1651
} else {
1652
int status;
1653
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1654
perror_plus("waitpid");
1655
continue;
1656
}
1657
if(WIFEXITED(status)){
1658
if(WEXITSTATUS(status) != 0){
1659
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1660
" with status %d\n", direntry->d_name,
1661
WEXITSTATUS(status));
1662
continue;
1663
}
1664
} else if(WIFSIGNALED(status)){
1665
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1666
" signal %d\n", direntry->d_name,
1667
WTERMSIG(status));
1668
continue;
1669
} else {
1670
fprintf_plus(stderr, "Warning: network hook \"%s\""
1671
" crashed\n", direntry->d_name);
1672
continue;
1673
}
1674
}
1675
if(debug){
1676
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1677
direntry->d_name);
1678
}
1679
}
1680
free(direntries);
1681
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1682
perror_plus("close");
1683
} else {
1684
hookdir_fd = -1;
1685
}
1686
close(devnull);
1687
}
1688
1689
__attribute__((nonnull, warn_unused_result))
1690
error_t bring_up_interface(const char *const interface,
1691
const float delay){
1692
error_t old_errno = errno;
1693
int ret;
1694
struct ifreq network;
1695
unsigned int if_index = if_nametoindex(interface);
1696
if(if_index == 0){
1697
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1698
errno = old_errno;
1699
return ENXIO;
1700
}
1701
1702
if(quit_now){
1703
errno = old_errno;
1704
return EINTR;
1705
}
1706
1707
if(not interface_is_up(interface)){
1708
error_t ret_errno = 0, ioctl_errno = 0;
1709
if(not get_flags(interface, &network)){
1710
ret_errno = errno;
1711
fprintf_plus(stderr, "Failed to get flags for interface "
1712
"\"%s\"\n", interface);
1713
errno = old_errno;
1714
return ret_errno;
1715
}
1716
network.ifr_flags |= IFF_UP; /* set flag */
1717
1718
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1719
if(sd == -1){
1720
ret_errno = errno;
1721
perror_plus("socket");
1722
errno = old_errno;
1723
return ret_errno;
1724
}
1725
1726
if(quit_now){
1727
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1728
if(ret == -1){
1729
perror_plus("close");
1730
}
1731
errno = old_errno;
1732
return EINTR;
1733
}
1734
1735
if(debug){
1736
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1737
interface);
1738
}
1739
1740
/* Raise privileges */
1741
ret_errno = raise_privileges();
1742
if(ret_errno != 0){
1743
errno = ret_errno;
1744
perror_plus("Failed to raise privileges");
1745
}
1746
1747
#ifdef __linux__
1748
int ret_linux;
1749
bool restore_loglevel = false;
1750
if(ret_errno == 0){
1751
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1752
messages about the network interface to mess up the prompt */
1753
ret_linux = klogctl(8, NULL, 5);
1754
if(ret_linux == -1){
1755
perror_plus("klogctl");
1756
} else {
1757
restore_loglevel = true;
1758
}
1759
}
1760
#endif /* __linux__ */
1761
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1762
ioctl_errno = errno;
1763
#ifdef __linux__
1764
if(restore_loglevel){
1765
ret_linux = klogctl(7, NULL, 0);
1766
if(ret_linux == -1){
1767
perror_plus("klogctl");
1768
}
1769
}
1770
#endif /* __linux__ */
1771
1772
/* If raise_privileges() succeeded above */
1773
if(ret_errno == 0){
1774
/* Lower privileges */
1775
ret_errno = lower_privileges();
1776
if(ret_errno != 0){
1777
errno = ret_errno;
1778
perror_plus("Failed to lower privileges");
1779
}
1780
}
1781
1782
/* Close the socket */
1783
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1784
if(ret == -1){
1785
perror_plus("close");
1786
}
1787
1788
if(ret_setflags == -1){
1789
errno = ioctl_errno;
1790
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1791
errno = old_errno;
1792
return ioctl_errno;
1793
}
1794
} else if(debug){
1795
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1796
interface);
1797
}
1798
1799
/* Sleep checking until interface is running.
1800
Check every 0.25s, up to total time of delay */
1801
for(int i=0; i < delay * 4; i++){
1802
if(interface_is_running(interface)){
1803
break;
1804
}
1805
struct timespec sleeptime = { .tv_nsec = 250000000 };
1806
ret = nanosleep(&sleeptime, NULL);
1807
if(ret == -1 and errno != EINTR){
1808
perror_plus("nanosleep");
1809
}
1810
}
1811
1812
errno = old_errno;
1813
return 0;
1814
}
1815
1816
__attribute__((nonnull, warn_unused_result))
1817
error_t take_down_interface(const char *const interface){
1818
error_t old_errno = errno;
1819
struct ifreq network;
1820
unsigned int if_index = if_nametoindex(interface);
1821
if(if_index == 0){
1822
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1823
errno = old_errno;
1824
return ENXIO;
1825
}
1826
if(interface_is_up(interface)){
1827
error_t ret_errno = 0, ioctl_errno = 0;
1828
if(not get_flags(interface, &network) and debug){
1829
ret_errno = errno;
1830
fprintf_plus(stderr, "Failed to get flags for interface "
1831
"\"%s\"\n", interface);
1832
errno = old_errno;
1833
return ret_errno;
1834
}
1835
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1836
1837
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1838
if(sd == -1){
1839
ret_errno = errno;
1840
perror_plus("socket");
1841
errno = old_errno;
1842
return ret_errno;
1843
}
1844
1845
if(debug){
1846
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1847
interface);
1848
}
1849
1850
/* Raise privileges */
1851
ret_errno = raise_privileges();
1852
if(ret_errno != 0){
1853
errno = ret_errno;
1854
perror_plus("Failed to raise privileges");
1855
}
1856
1857
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1858
ioctl_errno = errno;
1859
1860
/* If raise_privileges() succeeded above */
1861
if(ret_errno == 0){
1862
/* Lower privileges */
1863
ret_errno = lower_privileges();
1864
if(ret_errno != 0){
1865
errno = ret_errno;
1866
perror_plus("Failed to lower privileges");
1867
}
1868
}
1869
1870
/* Close the socket */
1871
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1872
if(ret == -1){
1873
perror_plus("close");
1874
}
1875
1876
if(ret_setflags == -1){
1877
errno = ioctl_errno;
1878
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1879
errno = old_errno;
1880
return ioctl_errno;
1881
}
1882
} else if(debug){
1883
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1884
interface);
1885
}
1886
1887
errno = old_errno;
1888
return 0;
1889
}
1890
1891
1122
int main(int argc, char *argv[]){
1892
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1893
.priority = "SECURE256:!CTYPE-X.509:"
1894
"+CTYPE-OPENPGP", .current_server = NULL,
1895
.interfaces = NULL, .interfaces_size = 0 };
1896
1123
AvahiSServiceBrowser *sb = NULL;
1897
error_t ret_errno;
1124
int error;
1898
1125
int ret;
1899
1126
intmax_t tmpmax;
1900
1127
char *tmp;
1901
1128
int exitcode = EXIT_SUCCESS;
1902
char *interfaces_to_take_down = NULL;
1903
size_t interfaces_to_take_down_size = 0;
1904
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1905
char old_tempdir[] = "/tmp/mandosXXXXXX";
1906
char *tempdir = NULL;
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;
1907
1137
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1908
1138
const char *seckey = PATHDIR "/" SECKEY;
1909
1139
const char *pubkey = PATHDIR "/" PUBKEY;
1910
char *interfaces_hooks = NULL;
1911
1140
1912
1141
bool gnutls_initialized = false;
1913
1142
bool gpgme_initialized = false;
1914
1143
float delay = 2.5f;
1915
double retry_interval = 10; /* 10s between trying a server and
1916
retrying the same server again */
1917
1144
1918
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1919
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1925
1152
errno = 0;
1926
1153
ret = setgid(gid);
1927
1154
if(ret == -1){
1928
perror_plus("setgid");
1155
perror("setgid");
1929
1156
}
1930
1157
1931
1158
/* Lower user privileges (temporarily) */
1932
1159
errno = 0;
1933
1160
ret = seteuid(uid);
1934
1161
if(ret == -1){
1935
perror_plus("seteuid");
1162
perror("seteuid");
1936
1163
}
1937
1164
1938
1165
if(quit_now){
1973
1200
.arg = "SECONDS",
1974
1201
.doc = "Maximum delay to wait for interface startup",
1975
1202
.group = 2 },
1976
{ .name = "retry", .key = 132,
1977
.arg = "SECONDS",
1978
.doc = "Retry interval used when denied by the Mandos server",
1979
.group = 2 },
1980
{ .name = "network-hook-dir", .key = 133,
1981
.arg = "DIR",
1982
.doc = "Directory where network hooks are located",
1983
.group = 2 },
1984
1203
/*
1985
1204
* These reproduce what we would get without ARGP_NO_HELP
1986
1205
*/
2004
1223
connect_to = arg;
2005
1224
break;
2006
1225
case 'i': /* --interface */
2007
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2008
arg, (int)',');
2009
if(ret_errno != 0){
2010
argp_error(state, "%s", strerror(ret_errno));
2011
}
1226
interface = arg;
2012
1227
break;
2013
1228
case 's': /* --seckey */
2014
1229
seckey = arg;
2034
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
2035
1250
argp_error(state, "Bad delay");
2036
1251
}
2037
case 132: /* --retry */
2038
errno = 0;
2039
retry_interval = strtod(arg, &tmp);
2040
if(errno != 0 or tmp == arg or *tmp != '\0'
2041
or (retry_interval * 1000) > INT_MAX
2042
or retry_interval < 0){
2043
argp_error(state, "Bad retry interval");
2044
}
2045
break;
2046
case 133: /* --network-hook-dir */
2047
hookdir = arg;
2048
1252
break;
2049
1253
/*
2050
1254
* These reproduce what we would get without ARGP_NO_HELP
2057
1261
argp_state_help(state, state->out_stream,
2058
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2059
1263
case 'V': /* --version */
2060
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
2061
1265
exit(argp_err_exit_status);
2062
1266
break;
2063
1267
default:
2078
1282
case ENOMEM:
2079
1283
default:
2080
1284
errno = ret;
2081
perror_plus("argp_parse");
1285
perror("argp_parse");
2082
1286
exitcode = EX_OSERR;
2083
1287
goto end;
2084
1288
case EINVAL:
2086
1290
goto end;
2087
1291
}
2088
1292
}
2089
2090
{
2091
/* Work around Debian bug #633582:
2092
<http://bugs.debian.org/633582> */
2093
2094
/* Re-raise privileges */
2095
ret_errno = raise_privileges();
2096
if(ret_errno != 0){
2097
errno = ret_errno;
2098
perror_plus("Failed to raise privileges");
2099
} else {
2100
struct stat st;
2101
2102
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2103
int seckey_fd = open(seckey, O_RDONLY);
2104
if(seckey_fd == -1){
2105
perror_plus("open");
2106
} else {
2107
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2108
if(ret == -1){
2109
perror_plus("fstat");
2110
} else {
2111
if(S_ISREG(st.st_mode)
2112
and st.st_uid == 0 and st.st_gid == 0){
2113
ret = fchown(seckey_fd, uid, gid);
2114
if(ret == -1){
2115
perror_plus("fchown");
2116
}
2117
}
2118
}
2119
TEMP_FAILURE_RETRY(close(seckey_fd));
2120
}
2121
}
2122
2123
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2124
int pubkey_fd = open(pubkey, O_RDONLY);
2125
if(pubkey_fd == -1){
2126
perror_plus("open");
2127
} else {
2128
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2129
if(ret == -1){
2130
perror_plus("fstat");
2131
} else {
2132
if(S_ISREG(st.st_mode)
2133
and st.st_uid == 0 and st.st_gid == 0){
2134
ret = fchown(pubkey_fd, uid, gid);
2135
if(ret == -1){
2136
perror_plus("fchown");
2137
}
2138
}
2139
}
2140
TEMP_FAILURE_RETRY(close(pubkey_fd));
2141
}
2142
}
2143
2144
/* Lower privileges */
2145
ret_errno = lower_privileges();
2146
if(ret_errno != 0){
2147
errno = ret_errno;
2148
perror_plus("Failed to lower privileges");
2149
}
2150
}
2151
}
2152
2153
/* Remove invalid interface names (except "none") */
2154
{
2155
char *interface = NULL;
2156
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2157
interface))){
2158
if(strcmp(interface, "none") != 0
2159
and if_nametoindex(interface) == 0){
2160
if(interface[0] != '\0'){
2161
fprintf_plus(stderr, "Not using nonexisting interface"
2162
" \"%s\"\n", interface);
2163
}
2164
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2165
interface = NULL;
2166
}
2167
}
2168
}
2169
2170
/* Run network hooks */
2171
{
2172
if(mc.interfaces != NULL){
2173
interfaces_hooks = malloc(mc.interfaces_size);
2174
if(interfaces_hooks == NULL){
2175
perror_plus("malloc");
2176
goto end;
2177
}
2178
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2179
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2180
}
2181
run_network_hooks("start", interfaces_hooks != NULL ?
2182
interfaces_hooks : "", delay);
2183
}
2184
1293
2185
1294
if(not debug){
2186
1295
avahi_set_log_function(empty_log);
2187
1296
}
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
}
2188
1322
2189
1323
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2190
1324
from the signal handler */
2191
1325
/* Initialize the pseudo-RNG for Avahi */
2192
1326
srand((unsigned int) time(NULL));
2193
simple_poll = avahi_simple_poll_new();
2194
if(simple_poll == NULL){
2195
fprintf_plus(stderr,
2196
"Avahi: Failed to create simple poll object.\n");
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");
2197
1330
exitcode = EX_UNAVAILABLE;
2198
1331
goto end;
2199
1332
}
2201
1334
sigemptyset(&sigterm_action.sa_mask);
2202
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2203
1336
if(ret == -1){
2204
perror_plus("sigaddset");
1337
perror("sigaddset");
2205
1338
exitcode = EX_OSERR;
2206
1339
goto end;
2207
1340
}
2208
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2209
1342
if(ret == -1){
2210
perror_plus("sigaddset");
1343
perror("sigaddset");
2211
1344
exitcode = EX_OSERR;
2212
1345
goto end;
2213
1346
}
2214
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2215
1348
if(ret == -1){
2216
perror_plus("sigaddset");
1349
perror("sigaddset");
2217
1350
exitcode = EX_OSERR;
2218
1351
goto end;
2219
1352
}
2223
1356
*/
2224
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2225
1358
if(ret == -1){
2226
perror_plus("sigaction");
1359
perror("sigaction");
2227
1360
return EX_OSERR;
2228
1361
}
2229
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
2230
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
2231
1364
if(ret == -1){
2232
perror_plus("sigaction");
1365
perror("sigaction");
2233
1366
exitcode = EX_OSERR;
2234
1367
goto end;
2235
1368
}
2236
1369
}
2237
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2238
1371
if(ret == -1){
2239
perror_plus("sigaction");
1372
perror("sigaction");
2240
1373
return EX_OSERR;
2241
1374
}
2242
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
2243
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2244
1377
if(ret == -1){
2245
perror_plus("sigaction");
1378
perror("sigaction");
2246
1379
exitcode = EX_OSERR;
2247
1380
goto end;
2248
1381
}
2249
1382
}
2250
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2251
1384
if(ret == -1){
2252
perror_plus("sigaction");
1385
perror("sigaction");
2253
1386
return EX_OSERR;
2254
1387
}
2255
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
2256
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2257
1390
if(ret == -1){
2258
perror_plus("sigaction");
1391
perror("sigaction");
2259
1392
exitcode = EX_OSERR;
2260
1393
goto end;
2261
1394
}
2262
1395
}
2263
1396
2264
/* If no interfaces were specified, make a list */
2265
if(mc.interfaces == NULL){
2266
struct dirent **direntries = NULL;
2267
/* Look for any good interfaces */
2268
ret = scandir(sys_class_net, &direntries, good_interface,
2269
alphasort);
2270
if(ret >= 1){
2271
/* Add all found interfaces to interfaces list */
2272
for(int i = 0; i < ret; ++i){
2273
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2274
direntries[i]->d_name);
2275
if(ret_errno != 0){
2276
errno = ret_errno;
2277
perror_plus("argz_add");
2278
continue;
2279
}
2280
if(debug){
2281
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2282
direntries[i]->d_name);
2283
}
2284
}
2285
free(direntries);
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");
1482
}
1483
}
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
break;
1501
}
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
}
2286
1532
} else {
2287
if(ret == 0){
2288
free(direntries);
2289
}
2290
fprintf_plus(stderr, "Could not find a network interface\n");
2291
exitcode = EXIT_FAILURE;
2292
goto end;
2293
}
2294
}
2295
2296
/* Bring up interfaces which are down, and remove any "none"s */
2297
{
2298
char *interface = NULL;
2299
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2300
interface))){
2301
/* If interface name is "none", stop bringing up interfaces.
2302
Also remove all instances of "none" from the list */
2303
if(strcmp(interface, "none") == 0){
2304
argz_delete(&mc.interfaces, &mc.interfaces_size,
2305
interface);
2306
interface = NULL;
2307
while((interface = argz_next(mc.interfaces,
2308
mc.interfaces_size, interface))){
2309
if(strcmp(interface, "none") == 0){
2310
argz_delete(&mc.interfaces, &mc.interfaces_size,
2311
interface);
2312
interface = NULL;
2313
}
2314
}
2315
break;
2316
}
2317
bool interface_was_up = interface_is_up(interface);
2318
errno = bring_up_interface(interface, delay);
2319
if(not interface_was_up){
2320
if(errno != 0){
2321
perror_plus("Failed to bring up interface");
2322
} else {
2323
errno = argz_add(&interfaces_to_take_down,
2324
&interfaces_to_take_down_size,
2325
interface);
2326
if(errno != 0){
2327
perror_plus("argz_add");
2328
}
2329
}
2330
}
2331
}
2332
if(debug and (interfaces_to_take_down == NULL)){
2333
fprintf_plus(stderr, "No interfaces were brought up\n");
2334
}
2335
}
2336
2337
/* If we only got one interface, explicitly use only that one */
2338
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2339
if(debug){
2340
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2341
mc.interfaces);
2342
}
2343
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
1538
}
2344
1539
}
2345
1540
2346
1541
if(quit_now){
2347
1542
goto end;
2348
1543
}
2349
1544
2350
ret = init_gnutls_global(pubkey, seckey, &mc);
1545
ret = init_gnutls_global(pubkey, seckey);
2351
1546
if(ret == -1){
2352
fprintf_plus(stderr, "init_gnutls_global failed\n");
1547
fprintf(stderr, "init_gnutls_global failed\n");
2353
1548
exitcode = EX_UNAVAILABLE;
2354
1549
goto end;
2355
1550
} else {
2360
1555
goto end;
2361
1556
}
2362
1557
2363
/* Try /run/tmp before /tmp */
2364
tempdir = mkdtemp(run_tempdir);
2365
if(tempdir == NULL and errno == ENOENT){
2366
if(debug){
2367
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2368
run_tempdir, old_tempdir);
2369
}
2370
tempdir = mkdtemp(old_tempdir);
2371
}
2372
if(tempdir == NULL){
2373
perror_plus("mkdtemp");
1558
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
2374
1562
goto end;
2375
1563
}
2376
1564
2378
1566
goto end;
2379
1567
}
2380
1568
2381
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2382
fprintf_plus(stderr, "init_gpgme failed\n");
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2383
1571
exitcode = EX_UNAVAILABLE;
2384
1572
goto end;
2385
1573
} else {
2394
1582
/* Connect directly, do not use Zeroconf */
2395
1583
/* (Mainly meant for debugging) */
2396
1584
char *address = strrchr(connect_to, ':');
2397
2398
1585
if(address == NULL){
2399
fprintf_plus(stderr, "No colon in address\n");
1586
fprintf(stderr, "No colon in address\n");
2400
1587
exitcode = EX_USAGE;
2401
1588
goto end;
2402
1589
}
2405
1592
goto end;
2406
1593
}
2407
1594
2408
in_port_t port;
1595
uint16_t port;
2409
1596
errno = 0;
2410
1597
tmpmax = strtoimax(address+1, &tmp, 10);
2411
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2412
or tmpmax != (in_port_t)tmpmax){
2413
fprintf_plus(stderr, "Bad port number\n");
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2414
1601
exitcode = EX_USAGE;
2415
1602
goto end;
2416
1603
}
2417
1604
2418
1605
if(quit_now){
2419
1606
goto end;
2420
1607
}
2421
1608
2422
port = (in_port_t)tmpmax;
1609
port = (uint16_t)tmpmax;
2423
1610
*address = '\0';
1611
address = connect_to;
2424
1612
/* Colon in address indicates IPv6 */
2425
1613
int af;
2426
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2427
1615
af = AF_INET6;
2428
/* Accept [] around IPv6 address - see RFC 5952 */
2429
if(connect_to[0] == '[' and address[-1] == ']')
2430
{
2431
connect_to++;
2432
address[-1] = '\0';
2433
}
2434
1616
} else {
2435
1617
af = AF_INET;
2436
1618
}
2437
address = connect_to;
2438
1619
2439
1620
if(quit_now){
2440
1621
goto end;
2441
1622
}
2442
1623
2443
1624
while(not quit_now){
2444
ret = start_mandos_communication(address, port, if_index, af,
2445
&mc);
1625
ret = start_mandos_communication(address, port, if_index, af);
2446
1626
if(quit_now or ret == 0){
2447
1627
break;
2448
1628
}
2449
if(debug){
2450
fprintf_plus(stderr, "Retrying in %d seconds\n",
2451
(int)retry_interval);
2452
}
2453
sleep((unsigned int)retry_interval);
2454
}
2455
2456
if(not quit_now){
1629
sleep(15);
1630
};
1631
1632
if (not quit_now){
2457
1633
exitcode = EXIT_SUCCESS;
2458
1634
}
2459
1635
2460
1636
goto end;
2461
1637
}
2462
1638
2474
1650
config.publish_domain = 0;
2475
1651
2476
1652
/* Allocate a new server */
2477
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2478
&config, NULL, NULL, &ret_errno);
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
2479
1656
2480
1657
/* Free the Avahi configuration data */
2481
1658
avahi_server_config_free(&config);
2483
1660
2484
1661
/* Check if creating the Avahi server object succeeded */
2485
1662
if(mc.server == NULL){
2486
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2487
avahi_strerror(ret_errno));
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2488
1665
exitcode = EX_UNAVAILABLE;
2489
1666
goto end;
2490
1667
}
2496
1673
/* Create the Avahi service browser */
2497
1674
sb = avahi_s_service_browser_new(mc.server, if_index,
2498
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2499
NULL, 0, browse_callback,
2500
(void *)&mc);
1676
NULL, 0, browse_callback, NULL);
2501
1677
if(sb == NULL){
2502
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2503
avahi_strerror(avahi_server_errno(mc.server)));
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2504
1680
exitcode = EX_UNAVAILABLE;
2505
1681
goto end;
2506
1682
}
2512
1688
/* Run the main loop */
2513
1689
2514
1690
if(debug){
2515
fprintf_plus(stderr, "Starting Avahi loop search\n");
1691
fprintf(stderr, "Starting Avahi loop search\n");
2516
1692
}
2517
1693
2518
ret = avahi_loop_with_timeout(simple_poll,
2519
(int)(retry_interval * 1000), &mc);
2520
if(debug){
2521
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2522
(ret == 0) ? "successfully" : "with error");
2523
}
1694
avahi_simple_poll_loop(mc.simple_poll);
2524
1695
2525
1696
end:
2526
1697
2527
1698
if(debug){
2528
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2529
1700
}
2530
1701
2531
1702
/* Cleanup things */
2532
free(mc.interfaces);
2533
2534
1703
if(sb != NULL)
2535
1704
avahi_s_service_browser_free(sb);
2536
1705
2537
1706
if(mc.server != NULL)
2538
1707
avahi_server_free(mc.server);
2539
1708
2540
if(simple_poll != NULL)
2541
avahi_simple_poll_free(simple_poll);
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
2542
1711
2543
1712
if(gnutls_initialized){
2544
1713
gnutls_certificate_free_credentials(mc.cred);
2550
1719
gpgme_release(mc.ctx);
2551
1720
}
2552
1721
2553
/* Cleans up the circular linked list of Mandos servers the client
2554
has seen */
2555
if(mc.current_server != NULL){
2556
mc.current_server->prev->next = NULL;
2557
while(mc.current_server != NULL){
2558
server *next = mc.current_server->next;
2559
#ifdef __GNUC__
2560
#pragma GCC diagnostic push
2561
#pragma GCC diagnostic ignored "-Wcast-qual"
2562
#endif
2563
free((char *)(mc.current_server->ip));
2564
#ifdef __GNUC__
2565
#pragma GCC diagnostic pop
2566
#endif
2567
free(mc.current_server);
2568
mc.current_server = next;
2569
}
2570
}
2571
2572
/* Re-raise privileges */
2573
{
2574
ret_errno = raise_privileges();
2575
if(ret_errno != 0){
2576
errno = ret_errno;
2577
perror_plus("Failed to raise privileges");
2578
} else {
2579
2580
/* Run network hooks */
2581
run_network_hooks("stop", interfaces_hooks != NULL ?
2582
interfaces_hooks : "", delay);
2583
2584
/* Take down the network interfaces which were brought up */
2585
{
2586
char *interface = NULL;
2587
while((interface=argz_next(interfaces_to_take_down,
2588
interfaces_to_take_down_size,
2589
interface))){
2590
ret_errno = take_down_interface(interface);
2591
if(ret_errno != 0){
2592
errno = ret_errno;
2593
perror_plus("Failed to take down interface");
2594
}
2595
}
2596
if(debug and (interfaces_to_take_down == NULL)){
2597
fprintf_plus(stderr, "No interfaces needed to be taken"
2598
" down\n");
2599
}
2600
}
2601
}
2602
2603
ret_errno = lower_privileges_permanently();
2604
if(ret_errno != 0){
2605
errno = ret_errno;
2606
perror_plus("Failed to lower privileges permanently");
2607
}
2608
}
2609
2610
free(interfaces_to_take_down);
2611
free(interfaces_hooks);
2612
2613
/* Removes the GPGME temp directory and all files inside */
2614
if(tempdir != NULL){
2615
struct dirent **direntries = NULL;
2616
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2617
O_NOFOLLOW));
2618
if(tempdir_fd == -1){
2619
perror_plus("open");
2620
} else {
2621
#ifdef __GLIBC__
2622
#if __GLIBC_PREREQ(2, 15)
2623
int numentries = scandirat(tempdir_fd, ".", &direntries,
2624
notdotentries, alphasort);
2625
#else /* not __GLIBC_PREREQ(2, 15) */
2626
int numentries = scandir(tempdir, &direntries, notdotentries,
2627
alphasort);
2628
#endif /* not __GLIBC_PREREQ(2, 15) */
2629
#else /* not __GLIBC__ */
2630
int numentries = scandir(tempdir, &direntries, notdotentries,
2631
alphasort);
2632
#endif /* not __GLIBC__ */
2633
if(numentries >= 0){
2634
for(int i = 0; i < numentries; i++){
2635
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2636
if(ret == -1){
2637
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2638
" \"%s\", 0): %s\n", tempdir,
2639
direntries[i]->d_name, strerror(errno));
2640
}
2641
}
2642
2643
/* need to clean even if 0 because man page doesn't specify */
2644
free(direntries);
2645
if(numentries == -1){
2646
perror_plus("scandir");
2647
}
2648
ret = rmdir(tempdir);
2649
if(ret == -1 and errno != ENOENT){
2650
perror_plus("rmdir");
2651
}
2652
}
2653
TEMP_FAILURE_RETRY(close(tempdir_fd));
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");
2654
1795
}
2655
1796
}
2656
1797
2661
1802
&old_sigterm_action,
2662
1803
NULL));
2663
1804
if(ret == -1){
2664
perror_plus("sigaction");
1805
perror("sigaction");
2665
1806
}
2666
1807
do {
2667
1808
ret = raise(signal_received);
2668
1809
} while(ret != 0 and errno == EINTR);
2669
1810
if(ret != 0){
2670
perror_plus("raise");
1811
perror("raise");
2671
1812
abort();
2672
1813
}
2673
1814
TEMP_FAILURE_RETRY(pause());
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Version: 2.0.2.dev0