To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 749.1.2
- compare with another revision
- download diff
- download tarball
- view history from revision 749.1.2
- Committer: Teddy Hogeborn
- Date: 2015-05-25 07:54:07 UTC
- mto: This revision was merged to the branch mainline in revision 756.
- Revision ID: teddy@recompile.se-20150525075407-x7u0z4f1zej6bm87
mandos (subprocess_call_pipe): Rename to "call_pipe" and take "func".
Generalize "subprocess_call_pipe" to "call_pipe" which takes an
additional "func" argument which is the function to be run.
Generalize "subprocess_call_pipe" to "call_pipe" which takes an
additional "func" argument which is the function to be run.
- files added:
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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, program_invocation_short_name */
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;
132
148
133
/* Doubly linked list that need to be circular linked when ever used */
149
/* Doubly linked list that need to be circularly linked when used */
134
150
typedef struct server{
135
151
const char *ip;
136
uint16_t port;
152
in_port_t port;
137
153
AvahiIfIndex if_index;
138
154
int af;
139
155
struct timespec last_seen;
143
159
144
160
/* Used for passing in values through the Avahi callback functions */
145
161
typedef struct {
146
AvahiSimplePoll *simple_poll;
147
162
AvahiServer *server;
148
163
gnutls_certificate_credentials_t cred;
149
164
unsigned int dh_bits;
151
166
const char *priority;
152
167
gpgme_ctx_t ctx;
153
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
154
171
} mandos_context;
155
172
156
/* global context so signal handler can reach it*/
157
mandos_context mc = { .simple_poll = NULL, .server = NULL,
158
.dh_bits = 1024, .priority = "SECURE256"
159
":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
160
175
161
176
sig_atomic_t quit_now = 0;
162
177
int signal_received = 0;
163
178
164
179
/* Function to use when printing errors */
165
180
void perror_plus(const char *print_text){
166
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
167
185
perror(print_text);
168
186
}
169
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
170
198
/*
171
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
172
200
* bytes. "buffer_capacity" is how much is currently allocated,
173
201
* "buffer_length" is how much is already used.
174
202
*/
203
__attribute__((nonnull, warn_unused_result))
175
204
size_t incbuffer(char **buffer, size_t buffer_length,
176
size_t buffer_capacity){
205
size_t buffer_capacity){
177
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
178
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
179
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;
180
213
return 0;
181
214
}
215
*buffer = new_buf;
182
216
buffer_capacity += BUFFER_SIZE;
183
217
}
184
218
return buffer_capacity;
185
219
}
186
220
187
int add_server(const char *ip, uint16_t port,
188
AvahiIfIndex if_index,
189
int af){
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){
190
225
int ret;
191
226
server *new_server = malloc(sizeof(server));
192
227
if(new_server == NULL){
193
228
perror_plus("malloc");
194
return -1;
229
return false;
195
230
}
196
231
*new_server = (server){ .ip = strdup(ip),
197
.port = port,
198
.if_index = if_index,
199
.af = af };
232
.port = port,
233
.if_index = if_index,
234
.af = af };
200
235
if(new_server->ip == NULL){
201
236
perror_plus("strdup");
202
return -1;
203
}
204
/* uniqe case of first server */
205
if (mc.current_server == NULL){
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){
206
256
new_server->next = new_server;
207
257
new_server->prev = new_server;
208
mc.current_server = new_server;
209
/* Placing the new server last in the list */
258
*current_server = new_server;
210
259
} else {
211
new_server->next = mc.current_server;
212
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
213
263
new_server->prev->next = new_server;
214
mc.current_server->prev = new_server;
215
}
216
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
217
if(ret == -1){
218
perror_plus("clock_gettime");
219
return -1;
220
}
221
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
222
267
}
223
268
224
269
/*
225
270
* Initialize GPGME.
226
271
*/
227
static bool init_gpgme(const char *seckey,
228
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){
229
277
gpgme_error_t rc;
230
278
gpgme_engine_info_t engine_info;
231
279
232
233
280
/*
234
281
* Helper function to insert pub and seckey to the engine keyring.
235
282
*/
236
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
237
284
int ret;
238
285
int fd;
239
286
gpgme_data_t pgp_data;
246
293
247
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
248
295
if(rc != GPG_ERR_NO_ERROR){
249
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
250
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));
251
298
return false;
252
299
}
253
300
254
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
255
302
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
257
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
258
305
return false;
259
306
}
260
307
267
314
}
268
315
269
316
if(debug){
270
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
271
318
}
272
319
273
320
/* Init GPGME */
274
321
gpgme_check_version(NULL);
275
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
276
323
if(rc != GPG_ERR_NO_ERROR){
277
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
278
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));
279
326
return false;
280
327
}
281
328
282
/* Set GPGME home directory for the OpenPGP engine only */
329
/* Set GPGME home directory for the OpenPGP engine only */
283
330
rc = gpgme_get_engine_info(&engine_info);
284
331
if(rc != GPG_ERR_NO_ERROR){
285
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
286
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));
287
334
return false;
288
335
}
289
336
while(engine_info != NULL){
295
342
engine_info = engine_info->next;
296
343
}
297
344
if(engine_info == NULL){
298
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);
299
347
return false;
300
348
}
301
349
302
350
/* Create new GPGME "context" */
303
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
304
352
if(rc != GPG_ERR_NO_ERROR){
305
fprintf(stderr, "bad gpgme_new: %s: %s\n",
306
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));
307
356
return false;
308
357
}
309
358
318
367
* Decrypt OpenPGP data.
319
368
* Returns -1 on error
320
369
*/
370
__attribute__((nonnull, warn_unused_result))
321
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
322
372
size_t crypto_size,
323
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
324
375
gpgme_data_t dh_crypto, dh_plain;
325
376
gpgme_error_t rc;
326
377
ssize_t ret;
328
379
ssize_t plaintext_length = 0;
329
380
330
381
if(debug){
331
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
332
383
}
333
384
334
385
/* Create new GPGME data buffer from memory cryptotext */
335
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
336
387
0);
337
388
if(rc != GPG_ERR_NO_ERROR){
338
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
339
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));
340
391
return -1;
341
392
}
342
393
343
394
/* Create new empty GPGME data buffer for the plaintext */
344
395
rc = gpgme_data_new(&dh_plain);
345
396
if(rc != GPG_ERR_NO_ERROR){
346
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
347
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));
348
400
gpgme_data_release(dh_crypto);
349
401
return -1;
350
402
}
351
403
352
404
/* Decrypt data from the cryptotext data buffer to the plaintext
353
405
data buffer */
354
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
355
407
if(rc != GPG_ERR_NO_ERROR){
356
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
358
410
plaintext_length = -1;
359
411
if(debug){
360
412
gpgme_decrypt_result_t result;
361
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
362
414
if(result == NULL){
363
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
364
416
} else {
365
fprintf(stderr, "Unsupported algorithm: %s\n",
366
result->unsupported_algorithm);
367
fprintf(stderr, "Wrong key usage: %u\n",
368
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);
369
421
if(result->file_name != NULL){
370
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
371
423
}
372
424
gpgme_recipient_t recipient;
373
425
recipient = result->recipients;
374
426
while(recipient != NULL){
375
fprintf(stderr, "Public key algorithm: %s\n",
376
gpgme_pubkey_algo_name(recipient->pubkey_algo));
377
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
378
fprintf(stderr, "Secret key available: %s\n",
379
recipient->status == GPG_ERR_NO_SECKEY
380
? "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");
381
434
recipient = recipient->next;
382
435
}
383
436
}
386
439
}
387
440
388
441
if(debug){
389
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
390
443
}
391
444
392
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
399
452
*plaintext = NULL;
400
453
while(true){
401
454
plaintext_capacity = incbuffer(plaintext,
402
(size_t)plaintext_length,
403
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
404
457
if(plaintext_capacity == 0){
405
perror_plus("incbuffer");
406
plaintext_length = -1;
407
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
408
461
}
409
462
410
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
423
476
}
424
477
425
478
if(debug){
426
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
427
480
for(ssize_t i = 0; i < plaintext_length; i++){
428
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
429
482
}
440
493
return plaintext_length;
441
494
}
442
495
443
static const char * safer_gnutls_strerror(int value){
444
const char *ret = gnutls_strerror(value); /* Spurious warning from
445
-Wunreachable-code */
446
if(ret == NULL)
447
ret = "(unknown)";
448
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);
449
507
}
450
508
451
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
452
511
static void debuggnutls(__attribute__((unused)) int level,
453
512
const char* string){
454
fprintf(stderr, "GnuTLS: %s", string);
513
fprintf_plus(stderr, "GnuTLS: %s", string);
455
514
}
456
515
516
__attribute__((nonnull, warn_unused_result))
457
517
static int init_gnutls_global(const char *pubkeyfilename,
458
const char *seckeyfilename){
518
const char *seckeyfilename,
519
mandos_context *mc){
459
520
int ret;
521
unsigned int uret;
460
522
461
523
if(debug){
462
fprintf(stderr, "Initializing GnuTLS\n");
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
463
525
}
464
526
465
527
ret = gnutls_global_init();
466
528
if(ret != GNUTLS_E_SUCCESS){
467
fprintf(stderr, "GnuTLS global_init: %s\n",
468
safer_gnutls_strerror(ret));
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
469
531
return -1;
470
532
}
471
533
478
540
}
479
541
480
542
/* OpenPGP credentials */
481
gnutls_certificate_allocate_credentials(&mc.cred);
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
482
544
if(ret != GNUTLS_E_SUCCESS){
483
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
484
from
485
-Wunreachable-code
486
*/
487
safer_gnutls_strerror(ret));
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
488
547
gnutls_global_deinit();
489
548
return -1;
490
549
}
491
550
492
551
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
554
pubkeyfilename,
555
seckeyfilename);
496
556
}
497
557
498
558
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
559
(mc->cred, pubkeyfilename, seckeyfilename,
500
560
GNUTLS_OPENPGP_FMT_BASE64);
501
561
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
562
fprintf_plus(stderr,
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
564
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
565
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
566
safer_gnutls_strerror(ret));
507
567
goto globalfail;
508
568
}
509
569
510
570
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
571
ret = gnutls_dh_params_init(&mc->dh_params);
512
572
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
573
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
" initialization: %s\n",
575
safer_gnutls_strerror(ret));
515
576
goto globalfail;
516
577
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
585
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
593
break;
594
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
596
BUFFER_SIZE);
597
/* EOF */
598
if(bytes_read == 0){
599
break;
600
}
601
/* check bytes_read for failure */
602
if(bytes_read < 0){
603
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
630
privkey = NULL;
631
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
644
}
645
}
646
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
650
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
653
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
655
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
665
(sec_param)),
666
mc->dh_bits);
667
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
674
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
680
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
521
683
goto globalfail;
522
684
}
523
685
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
687
526
688
return 0;
527
689
528
690
globalfail:
529
691
530
gnutls_certificate_free_credentials(mc.cred);
692
gnutls_certificate_free_credentials(mc->cred);
531
693
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
694
gnutls_dh_params_deinit(mc->dh_params);
533
695
return -1;
534
696
}
535
697
536
static int init_gnutls_session(gnutls_session_t *session){
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
537
701
int ret;
538
702
/* GnuTLS session creation */
539
703
do {
543
707
}
544
708
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
709
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
710
fprintf_plus(stderr,
711
"Error in GnuTLS session initialization: %s\n",
712
safer_gnutls_strerror(ret));
548
713
}
549
714
550
715
{
551
716
const char *err;
552
717
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
554
719
if(quit_now){
555
720
gnutls_deinit(*session);
556
721
return -1;
557
722
}
558
723
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
724
if(ret != GNUTLS_E_SUCCESS){
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
725
fprintf_plus(stderr, "Syntax error at: %s\n", err);
726
fprintf_plus(stderr, "GnuTLS error: %s\n",
727
safer_gnutls_strerror(ret));
563
728
gnutls_deinit(*session);
564
729
return -1;
565
730
}
567
732
568
733
do {
569
734
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
735
mc->cred);
571
736
if(quit_now){
572
737
gnutls_deinit(*session);
573
738
return -1;
574
739
}
575
740
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
741
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
742
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
743
safer_gnutls_strerror(ret));
579
744
gnutls_deinit(*session);
580
745
return -1;
581
746
}
583
748
/* ignore client certificate if any. */
584
749
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
585
750
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
587
752
588
753
return 0;
589
754
}
593
758
__attribute__((unused)) const char *txt){}
594
759
595
760
/* Called when a Mandos server is found */
596
static int start_mandos_communication(const char *ip, uint16_t port,
761
__attribute__((nonnull, warn_unused_result))
762
static int start_mandos_communication(const char *ip, in_port_t port,
597
763
AvahiIfIndex if_index,
598
int af){
764
int af, mandos_context *mc){
599
765
int ret, tcp_sd = -1;
600
766
ssize_t sret;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
767
struct sockaddr_storage to;
605
768
char *buffer = NULL;
606
769
char *decrypted_buffer = NULL;
607
770
size_t buffer_length = 0;
626
789
pf = PF_INET;
627
790
break;
628
791
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
792
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
793
errno = EINVAL;
631
794
return -1;
632
795
}
633
796
634
ret = init_gnutls_session(&session);
797
/* If the interface is specified and we have a list of interfaces */
798
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
799
/* Check if the interface is one of the interfaces we are using */
800
bool match = false;
801
{
802
char *interface = NULL;
803
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
804
interface))){
805
if(if_nametoindex(interface) == (unsigned int)if_index){
806
match = true;
807
break;
808
}
809
}
810
}
811
if(not match){
812
/* This interface does not match any in the list, so we don't
813
connect to the server */
814
if(debug){
815
char interface[IF_NAMESIZE];
816
if(if_indextoname((unsigned int)if_index, interface) == NULL){
817
perror_plus("if_indextoname");
818
} else {
819
fprintf_plus(stderr, "Skipping server on non-used interface"
820
" \"%s\"\n",
821
if_indextoname((unsigned int)if_index,
822
interface));
823
}
824
}
825
return -1;
826
}
827
}
828
829
ret = init_gnutls_session(&session, mc);
635
830
if(ret != 0){
636
831
return -1;
637
832
}
638
833
639
834
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
835
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
836
PRIuMAX "\n", ip, (uintmax_t)port);
642
837
}
643
838
644
839
tcp_sd = socket(pf, SOCK_STREAM, 0);
656
851
657
852
memset(&to, 0, sizeof(to));
658
853
if(af == AF_INET6){
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
854
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
855
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
661
856
} else { /* IPv4 */
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
857
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
858
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
664
859
}
665
860
if(ret < 0 ){
666
861
int e = errno;
670
865
}
671
866
if(ret == 0){
672
867
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
868
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
869
errno = e;
675
870
goto mandos_end;
676
871
}
677
872
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
873
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
874
if(IN6_IS_ADDR_LINKLOCAL
875
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
685
876
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
877
fprintf_plus(stderr, "An IPv6 link-local address is"
878
" incomplete without a network interface\n");
688
879
errno = EINVAL;
689
880
goto mandos_end;
690
881
}
691
882
/* Set the network interface number as scope */
692
to.in6.sin6_scope_id = (uint32_t)if_index;
883
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
693
884
}
694
885
} else {
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
886
((struct sockaddr_in *)&to)->sin_port = htons(port);
698
887
}
699
888
700
889
if(quit_now){
708
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
898
perror_plus("if_indextoname");
710
899
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
900
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
901
"\n", ip, interface, (uintmax_t)port);
713
902
}
714
903
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
904
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
905
ip, (uintmax_t)port);
717
906
}
718
907
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
908
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
721
909
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
910
ret = getnameinfo((struct sockaddr *)&to,
911
sizeof(struct sockaddr_in6),
912
addrstr, sizeof(addrstr), NULL, 0,
913
NI_NUMERICHOST);
724
914
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
915
ret = getnameinfo((struct sockaddr *)&to,
916
sizeof(struct sockaddr_in),
917
addrstr, sizeof(addrstr), NULL, 0,
918
NI_NUMERICHOST);
727
919
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
730
} else {
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
733
}
920
if(ret == EAI_SYSTEM){
921
perror_plus("getnameinfo");
922
} else if(ret != 0) {
923
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
924
} else if(strcmp(addrstr, ip) != 0){
925
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
926
}
735
927
}
736
928
740
932
}
741
933
742
934
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
935
ret = connect(tcp_sd, (struct sockaddr *)&to,
936
sizeof(struct sockaddr_in6));
744
937
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
938
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
939
sizeof(struct sockaddr_in));
746
940
}
747
941
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
942
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
943
int e = errno;
750
944
perror_plus("connect");
751
945
errno = e;
763
957
while(true){
764
958
size_t out_size = strlen(out);
765
959
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
960
out_size - written));
767
961
if(ret == -1){
768
962
int e = errno;
769
963
perror_plus("write");
789
983
}
790
984
791
985
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
986
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
987
}
794
988
795
989
if(quit_now){
796
990
errno = EINTR;
797
991
goto mandos_end;
798
992
}
799
800
/* Spurious warnings from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
993
994
/* This casting via intptr_t is to eliminate warning about casting
995
an int to a pointer type. This is exactly how the GnuTLS Guile
996
function "set-session-transport-fd!" does it. */
997
gnutls_transport_set_ptr(session,
998
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
802
999
803
1000
if(quit_now){
804
1001
errno = EINTR;
815
1012
816
1013
if(ret != GNUTLS_E_SUCCESS){
817
1014
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1015
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
1016
gnutls_perror(ret);
820
1017
}
821
1018
errno = EPROTO;
825
1022
/* Read OpenPGP packet that contains the wanted password */
826
1023
827
1024
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
1025
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1026
" %s\n", ip);
830
1027
}
831
1028
832
1029
while(true){
837
1034
}
838
1035
839
1036
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
1037
buffer_capacity);
841
1038
if(buffer_capacity == 0){
842
1039
int e = errno;
843
1040
perror_plus("incbuffer");
870
1067
}
871
1068
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
1069
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1070
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1071
"***\n");
874
1072
gnutls_perror(ret);
875
1073
errno = EPROTO;
876
1074
goto mandos_end;
877
1075
}
878
1076
break;
879
1077
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
1078
fprintf_plus(stderr, "Unknown error while reading data from"
1079
" encrypted session with Mandos server\n");
882
1080
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
1081
errno = EIO;
884
1082
goto mandos_end;
889
1087
}
890
1088
891
1089
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
1090
fprintf_plus(stderr, "Closing TLS session\n");
893
1091
}
894
1092
895
1093
if(quit_now){
907
1105
908
1106
if(buffer_length > 0){
909
1107
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
1108
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1109
&decrypted_buffer, mc);
913
1110
if(decrypted_buffer_size >= 0){
914
1111
915
1112
written = 0;
925
1122
if(ret == 0 and ferror(stdout)){
926
1123
int e = errno;
927
1124
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
1125
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1126
strerror(errno));
930
1127
}
931
1128
errno = e;
932
1129
goto mandos_end;
963
1160
return retval;
964
1161
}
965
1162
1163
__attribute__((nonnull))
966
1164
static void resolve_callback(AvahiSServiceResolver *r,
967
1165
AvahiIfIndex interface,
968
1166
AvahiProtocol proto,
976
1174
AVAHI_GCC_UNUSED AvahiStringList *txt,
977
1175
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
1176
flags,
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1177
void *mc){
1178
if(r == NULL){
1179
return;
1180
}
981
1181
982
1182
/* Called whenever a service has been resolved successfully or
983
1183
timed out */
984
1184
985
1185
if(quit_now){
1186
avahi_s_service_resolver_free(r);
986
1187
return;
987
1188
}
988
1189
989
1190
switch(event){
990
1191
default:
991
1192
case AVAHI_RESOLVER_FAILURE:
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
1193
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1194
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1195
domain,
1196
avahi_strerror(avahi_server_errno
1197
(((mandos_context*)mc)->server)));
995
1198
break;
996
1199
997
1200
case AVAHI_RESOLVER_FOUND:
999
1202
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1203
avahi_address_snprint(ip, sizeof(ip), address);
1001
1204
if(debug){
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
1205
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1206
PRIdMAX ") on port %" PRIu16 "\n", name,
1207
host_name, ip, (intmax_t)interface, port);
1005
1208
}
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1209
int ret = start_mandos_communication(ip, (in_port_t)port,
1210
interface,
1211
avahi_proto_to_af(proto),
1212
mc);
1008
1213
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1214
avahi_simple_poll_quit(simple_poll);
1010
1215
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1216
if(not add_server(ip, (in_port_t)port, interface,
1217
avahi_proto_to_af(proto),
1218
&((mandos_context*)mc)->current_server)){
1219
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1220
" list\n", name);
1221
}
1013
1222
}
1014
1223
}
1015
1224
}
1025
1234
const char *domain,
1026
1235
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
1236
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1237
void *mc){
1238
if(b == NULL){
1239
return;
1240
}
1030
1241
1031
1242
/* Called whenever a new services becomes available on the LAN or
1032
1243
is removed from the LAN */
1039
1250
default:
1040
1251
case AVAHI_BROWSER_FAILURE:
1041
1252
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1253
fprintf_plus(stderr, "(Avahi browser) %s\n",
1254
avahi_strerror(avahi_server_errno
1255
(((mandos_context*)mc)->server)));
1256
avahi_simple_poll_quit(simple_poll);
1045
1257
return;
1046
1258
1047
1259
case AVAHI_BROWSER_NEW:
1050
1262
the callback function is called the Avahi server will free the
1051
1263
resolver for us. */
1052
1264
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1265
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1266
interface, protocol, name, type,
1267
domain, protocol, 0,
1268
resolve_callback, mc) == NULL)
1269
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1270
" %s\n", name,
1271
avahi_strerror(avahi_server_errno
1272
(((mandos_context*)mc)->server)));
1058
1273
break;
1059
1274
1060
1275
case AVAHI_BROWSER_REMOVE:
1063
1278
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1279
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1280
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1281
fprintf_plus(stderr, "No Mandos server found, still"
1282
" searching...\n");
1067
1283
}
1068
1284
break;
1069
1285
}
1070
1286
}
1071
1287
1072
/* Signal handler that stops main loop after sigterm has been called */
1288
/* Signal handler that stops main loop after SIGTERM */
1073
1289
static void handle_sigterm(int sig){
1074
1290
if(quit_now){
1075
1291
return;
1078
1294
signal_received = sig;
1079
1295
int old_errno = errno;
1080
1296
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1297
if(simple_poll != NULL){
1298
avahi_simple_poll_quit(simple_poll);
1083
1299
}
1084
1300
errno = old_errno;
1085
1301
}
1086
1302
1303
__attribute__((nonnull, warn_unused_result))
1304
bool get_flags(const char *ifname, struct ifreq *ifr){
1305
int ret;
1306
error_t ret_errno;
1307
1308
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1309
if(s < 0){
1310
ret_errno = errno;
1311
perror_plus("socket");
1312
errno = ret_errno;
1313
return false;
1314
}
1315
strcpy(ifr->ifr_name, ifname);
1316
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1317
if(ret == -1){
1318
if(debug){
1319
ret_errno = errno;
1320
perror_plus("ioctl SIOCGIFFLAGS");
1321
errno = ret_errno;
1322
}
1323
return false;
1324
}
1325
return true;
1326
}
1327
1328
__attribute__((nonnull, warn_unused_result))
1329
bool good_flags(const char *ifname, const struct ifreq *ifr){
1330
1331
/* Reject the loopback device */
1332
if(ifr->ifr_flags & IFF_LOOPBACK){
1333
if(debug){
1334
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1335
ifname);
1336
}
1337
return false;
1338
}
1339
/* Accept point-to-point devices only if connect_to is specified */
1340
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1341
if(debug){
1342
fprintf_plus(stderr, "Accepting point-to-point interface"
1343
" \"%s\"\n", ifname);
1344
}
1345
return true;
1346
}
1347
/* Otherwise, reject non-broadcast-capable devices */
1348
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1349
if(debug){
1350
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1351
" \"%s\"\n", ifname);
1352
}
1353
return false;
1354
}
1355
/* Reject non-ARP interfaces (including dummy interfaces) */
1356
if(ifr->ifr_flags & IFF_NOARP){
1357
if(debug){
1358
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1359
ifname);
1360
}
1361
return false;
1362
}
1363
1364
/* Accept this device */
1365
if(debug){
1366
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1367
}
1368
return true;
1369
}
1370
1087
1371
/*
1088
1372
* This function determines if a directory entry in /sys/class/net
1089
1373
* corresponds to an acceptable network device.
1090
1374
* (This function is passed to scandir(3) as a filter function.)
1091
1375
*/
1376
__attribute__((nonnull, warn_unused_result))
1092
1377
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
1378
if(if_entry->d_name[0] == '.'){
1096
1379
return 0;
1097
1380
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1381
1382
struct ifreq ifr;
1383
if(not get_flags(if_entry->d_name, &ifr)){
1384
if(debug){
1385
fprintf_plus(stderr, "Failed to get flags for interface "
1386
"\"%s\"\n", if_entry->d_name);
1387
}
1388
return 0;
1389
}
1390
1391
if(not good_flags(if_entry->d_name, &ifr)){
1392
return 0;
1188
1393
}
1189
1394
return 1;
1190
1395
}
1191
1396
1397
/*
1398
* This function determines if a network interface is up.
1399
*/
1400
__attribute__((nonnull, warn_unused_result))
1401
bool interface_is_up(const char *interface){
1402
struct ifreq ifr;
1403
if(not get_flags(interface, &ifr)){
1404
if(debug){
1405
fprintf_plus(stderr, "Failed to get flags for interface "
1406
"\"%s\"\n", interface);
1407
}
1408
return false;
1409
}
1410
1411
return (bool)(ifr.ifr_flags & IFF_UP);
1412
}
1413
1414
/*
1415
* This function determines if a network interface is running
1416
*/
1417
__attribute__((nonnull, warn_unused_result))
1418
bool interface_is_running(const char *interface){
1419
struct ifreq ifr;
1420
if(not get_flags(interface, &ifr)){
1421
if(debug){
1422
fprintf_plus(stderr, "Failed to get flags for interface "
1423
"\"%s\"\n", interface);
1424
}
1425
return false;
1426
}
1427
1428
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1429
}
1430
1431
__attribute__((nonnull, pure, warn_unused_result))
1192
1432
int notdotentries(const struct dirent *direntry){
1193
1433
/* Skip "." and ".." */
1194
1434
if(direntry->d_name[0] == '.'
1200
1440
return 1;
1201
1441
}
1202
1442
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1443
/* Is this directory entry a runnable program? */
1444
__attribute__((nonnull, warn_unused_result))
1445
int runnable_hook(const struct dirent *direntry){
1446
int ret;
1447
size_t sret;
1448
struct stat st;
1449
1450
if((direntry->d_name)[0] == '\0'){
1451
/* Empty name? */
1452
return 0;
1453
}
1454
1455
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1456
"abcdefghijklmnopqrstuvwxyz"
1457
"0123456789"
1458
"_.-");
1459
if((direntry->d_name)[sret] != '\0'){
1460
/* Contains non-allowed characters */
1461
if(debug){
1462
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1463
direntry->d_name);
1464
}
1465
return 0;
1466
}
1467
1468
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1469
if(ret == -1){
1470
if(debug){
1471
perror_plus("Could not stat hook");
1472
}
1473
return 0;
1474
}
1475
if(not (S_ISREG(st.st_mode))){
1476
/* Not a regular file */
1477
if(debug){
1478
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1479
direntry->d_name);
1480
}
1481
return 0;
1482
}
1483
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1484
/* Not executable */
1485
if(debug){
1486
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1487
direntry->d_name);
1488
}
1489
return 0;
1490
}
1491
if(debug){
1492
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1493
direntry->d_name);
1494
}
1495
return 1;
1496
}
1497
1498
__attribute__((nonnull, warn_unused_result))
1499
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1500
mandos_context *mc){
1204
1501
int ret;
1205
1502
struct timespec now;
1206
1503
struct timespec waited_time;
1207
1504
intmax_t block_time;
1208
1505
1209
1506
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
1507
if(mc->current_server == NULL){
1508
if(debug){
1509
fprintf_plus(stderr, "Wait until first server is found."
1510
" No timeout!\n");
1213
1511
}
1214
1512
ret = avahi_simple_poll_iterate(s, -1);
1215
1513
} else {
1216
if (debug){
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
1514
if(debug){
1515
fprintf_plus(stderr, "Check current_server if we should run"
1516
" it, or wait\n");
1218
1517
}
1219
1518
/* the current time */
1220
1519
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
1523
}
1225
1524
/* Calculating in ms how long time between now and server
1226
1525
who we visted longest time ago. Now - last seen. */
1227
waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;
1228
waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;
1229
/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */
1230
block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);
1231
1232
if (debug){
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1526
waited_time.tv_sec = (now.tv_sec
1527
- mc->current_server->last_seen.tv_sec);
1528
waited_time.tv_nsec = (now.tv_nsec
1529
- mc->current_server->last_seen.tv_nsec);
1530
/* total time is 10s/10,000ms.
1531
Converting to s from ms by dividing by 1,000,
1532
and ns to ms by dividing by 1,000,000. */
1533
block_time = ((retry_interval
1534
- ((intmax_t)waited_time.tv_sec * 1000))
1535
- ((intmax_t)waited_time.tv_nsec / 1000000));
1536
1537
if(debug){
1538
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1539
block_time);
1234
1540
}
1235
1541
1236
1542
if(block_time <= 0){
1237
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
1543
ret = start_mandos_communication(mc->current_server->ip,
1544
mc->current_server->port,
1545
mc->current_server->if_index,
1546
mc->current_server->af, mc);
1241
1547
if(ret == 0){
1242
avahi_simple_poll_quit(mc.simple_poll);
1548
avahi_simple_poll_quit(s);
1243
1549
return 0;
1244
1550
}
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
1551
ret = clock_gettime(CLOCK_MONOTONIC,
1552
&mc->current_server->last_seen);
1246
1553
if(ret == -1){
1247
1554
perror_plus("clock_gettime");
1248
1555
return -1;
1249
1556
}
1250
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
1557
mc->current_server = mc->current_server->next;
1558
block_time = 0; /* Call avahi to find new Mandos
1559
servers, but don't block */
1252
1560
}
1253
1561
1254
1562
ret = avahi_simple_poll_iterate(s, (int)block_time);
1255
1563
}
1256
1564
if(ret != 0){
1257
if (ret > 0 or errno != EINTR) {
1565
if(ret > 0 or errno != EINTR){
1258
1566
return (ret != 1) ? ret : 0;
1259
1567
}
1260
1568
}
1261
1569
}
1262
1570
}
1263
1571
1572
/* Set effective uid to 0, return errno */
1573
__attribute__((warn_unused_result))
1574
error_t raise_privileges(void){
1575
error_t old_errno = errno;
1576
error_t ret_errno = 0;
1577
if(seteuid(0) == -1){
1578
ret_errno = errno;
1579
}
1580
errno = old_errno;
1581
return ret_errno;
1582
}
1583
1584
/* Set effective and real user ID to 0. Return errno. */
1585
__attribute__((warn_unused_result))
1586
error_t raise_privileges_permanently(void){
1587
error_t old_errno = errno;
1588
error_t ret_errno = raise_privileges();
1589
if(ret_errno != 0){
1590
errno = old_errno;
1591
return ret_errno;
1592
}
1593
if(setuid(0) == -1){
1594
ret_errno = errno;
1595
}
1596
errno = old_errno;
1597
return ret_errno;
1598
}
1599
1600
/* Set effective user ID to unprivileged saved user ID */
1601
__attribute__((warn_unused_result))
1602
error_t lower_privileges(void){
1603
error_t old_errno = errno;
1604
error_t ret_errno = 0;
1605
if(seteuid(uid) == -1){
1606
ret_errno = errno;
1607
}
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
/* Lower privileges permanently */
1613
__attribute__((warn_unused_result))
1614
error_t lower_privileges_permanently(void){
1615
error_t old_errno = errno;
1616
error_t ret_errno = 0;
1617
if(setuid(uid) == -1){
1618
ret_errno = errno;
1619
}
1620
errno = old_errno;
1621
return ret_errno;
1622
}
1623
1624
__attribute__((nonnull))
1625
void run_network_hooks(const char *mode, const char *interface,
1626
const float delay){
1627
struct dirent **direntries = NULL;
1628
if(hookdir_fd == -1){
1629
hookdir_fd = open(hookdir, O_RDONLY);
1630
if(hookdir_fd == -1){
1631
if(errno == ENOENT){
1632
if(debug){
1633
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1634
" found\n", hookdir);
1635
}
1636
} else {
1637
perror_plus("open");
1638
}
1639
return;
1640
}
1641
}
1642
#ifdef __GLIBC__
1643
#if __GLIBC_PREREQ(2, 15)
1644
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1645
runnable_hook, alphasort);
1646
#else /* not __GLIBC_PREREQ(2, 15) */
1647
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1648
alphasort);
1649
#endif /* not __GLIBC_PREREQ(2, 15) */
1650
#else /* not __GLIBC__ */
1651
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1652
alphasort);
1653
#endif /* not __GLIBC__ */
1654
if(numhooks == -1){
1655
perror_plus("scandir");
1656
return;
1657
}
1658
struct dirent *direntry;
1659
int ret;
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[i];
1663
if(debug){
1664
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1665
direntry->d_name);
1666
}
1667
pid_t hook_pid = fork();
1668
if(hook_pid == 0){
1669
/* Child */
1670
/* Raise privileges */
1671
errno = raise_privileges_permanently();
1672
if(errno != 0){
1673
perror_plus("Failed to raise privileges");
1674
_exit(EX_NOPERM);
1675
}
1676
/* Set group */
1677
errno = 0;
1678
ret = setgid(0);
1679
if(ret == -1){
1680
perror_plus("setgid");
1681
_exit(EX_NOPERM);
1682
}
1683
/* Reset supplementary groups */
1684
errno = 0;
1685
ret = setgroups(0, NULL);
1686
if(ret == -1){
1687
perror_plus("setgroups");
1688
_exit(EX_NOPERM);
1689
}
1690
ret = dup2(devnull, STDIN_FILENO);
1691
if(ret == -1){
1692
perror_plus("dup2(devnull, STDIN_FILENO)");
1693
_exit(EX_OSERR);
1694
}
1695
ret = close(devnull);
1696
if(ret == -1){
1697
perror_plus("close");
1698
_exit(EX_OSERR);
1699
}
1700
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1701
if(ret == -1){
1702
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1703
_exit(EX_OSERR);
1704
}
1705
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1706
if(ret == -1){
1707
perror_plus("setenv");
1708
_exit(EX_OSERR);
1709
}
1710
ret = setenv("DEVICE", interface, 1);
1711
if(ret == -1){
1712
perror_plus("setenv");
1713
_exit(EX_OSERR);
1714
}
1715
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1716
if(ret == -1){
1717
perror_plus("setenv");
1718
_exit(EX_OSERR);
1719
}
1720
ret = setenv("MODE", mode, 1);
1721
if(ret == -1){
1722
perror_plus("setenv");
1723
_exit(EX_OSERR);
1724
}
1725
char *delaystring;
1726
ret = asprintf(&delaystring, "%f", (double)delay);
1727
if(ret == -1){
1728
perror_plus("asprintf");
1729
_exit(EX_OSERR);
1730
}
1731
ret = setenv("DELAY", delaystring, 1);
1732
if(ret == -1){
1733
free(delaystring);
1734
perror_plus("setenv");
1735
_exit(EX_OSERR);
1736
}
1737
free(delaystring);
1738
if(connect_to != NULL){
1739
ret = setenv("CONNECT", connect_to, 1);
1740
if(ret == -1){
1741
perror_plus("setenv");
1742
_exit(EX_OSERR);
1743
}
1744
}
1745
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1746
if(hook_fd == -1){
1747
perror_plus("openat");
1748
_exit(EXIT_FAILURE);
1749
}
1750
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1751
perror_plus("close");
1752
_exit(EXIT_FAILURE);
1753
}
1754
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1755
environ) == -1){
1756
perror_plus("fexecve");
1757
_exit(EXIT_FAILURE);
1758
}
1759
} else {
1760
if(hook_pid == -1){
1761
perror_plus("fork");
1762
free(direntry);
1763
continue;
1764
}
1765
int status;
1766
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1767
perror_plus("waitpid");
1768
free(direntry);
1769
continue;
1770
}
1771
if(WIFEXITED(status)){
1772
if(WEXITSTATUS(status) != 0){
1773
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1774
" with status %d\n", direntry->d_name,
1775
WEXITSTATUS(status));
1776
free(direntry);
1777
continue;
1778
}
1779
} else if(WIFSIGNALED(status)){
1780
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1781
" signal %d\n", direntry->d_name,
1782
WTERMSIG(status));
1783
free(direntry);
1784
continue;
1785
} else {
1786
fprintf_plus(stderr, "Warning: network hook \"%s\""
1787
" crashed\n", direntry->d_name);
1788
free(direntry);
1789
continue;
1790
}
1791
}
1792
if(debug){
1793
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1794
direntry->d_name);
1795
}
1796
free(direntry);
1797
}
1798
free(direntries);
1799
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1800
perror_plus("close");
1801
} else {
1802
hookdir_fd = -1;
1803
}
1804
close(devnull);
1805
}
1806
1807
__attribute__((nonnull, warn_unused_result))
1808
error_t bring_up_interface(const char *const interface,
1809
const float delay){
1810
error_t old_errno = errno;
1811
int ret;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
1820
if(quit_now){
1821
errno = old_errno;
1822
return EINTR;
1823
}
1824
1825
if(not interface_is_up(interface)){
1826
error_t ret_errno = 0, ioctl_errno = 0;
1827
if(not get_flags(interface, &network)){
1828
ret_errno = errno;
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1831
errno = old_errno;
1832
return ret_errno;
1833
}
1834
network.ifr_flags |= IFF_UP; /* set flag */
1835
1836
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1837
if(sd == -1){
1838
ret_errno = errno;
1839
perror_plus("socket");
1840
errno = old_errno;
1841
return ret_errno;
1842
}
1843
1844
if(quit_now){
1845
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1849
errno = old_errno;
1850
return EINTR;
1851
}
1852
1853
if(debug){
1854
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1855
interface);
1856
}
1857
1858
/* Raise privileges */
1859
ret_errno = raise_privileges();
1860
if(ret_errno != 0){
1861
errno = ret_errno;
1862
perror_plus("Failed to raise privileges");
1863
}
1864
1865
#ifdef __linux__
1866
int ret_linux;
1867
bool restore_loglevel = false;
1868
if(ret_errno == 0){
1869
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1870
messages about the network interface to mess up the prompt */
1871
ret_linux = klogctl(8, NULL, 5);
1872
if(ret_linux == -1){
1873
perror_plus("klogctl");
1874
} else {
1875
restore_loglevel = true;
1876
}
1877
}
1878
#endif /* __linux__ */
1879
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1880
ioctl_errno = errno;
1881
#ifdef __linux__
1882
if(restore_loglevel){
1883
ret_linux = klogctl(7, NULL, 0);
1884
if(ret_linux == -1){
1885
perror_plus("klogctl");
1886
}
1887
}
1888
#endif /* __linux__ */
1889
1890
/* If raise_privileges() succeeded above */
1891
if(ret_errno == 0){
1892
/* Lower privileges */
1893
ret_errno = lower_privileges();
1894
if(ret_errno != 0){
1895
errno = ret_errno;
1896
perror_plus("Failed to lower privileges");
1897
}
1898
}
1899
1900
/* Close the socket */
1901
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1902
if(ret == -1){
1903
perror_plus("close");
1904
}
1905
1906
if(ret_setflags == -1){
1907
errno = ioctl_errno;
1908
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1909
errno = old_errno;
1910
return ioctl_errno;
1911
}
1912
} else if(debug){
1913
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1914
interface);
1915
}
1916
1917
/* Sleep checking until interface is running.
1918
Check every 0.25s, up to total time of delay */
1919
for(int i=0; i < delay * 4; i++){
1920
if(interface_is_running(interface)){
1921
break;
1922
}
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
ret = nanosleep(&sleeptime, NULL);
1925
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1927
}
1928
}
1929
1930
errno = old_errno;
1931
return 0;
1932
}
1933
1934
__attribute__((nonnull, warn_unused_result))
1935
error_t take_down_interface(const char *const interface){
1936
error_t old_errno = errno;
1937
struct ifreq network;
1938
unsigned int if_index = if_nametoindex(interface);
1939
if(if_index == 0){
1940
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1941
errno = old_errno;
1942
return ENXIO;
1943
}
1944
if(interface_is_up(interface)){
1945
error_t ret_errno = 0, ioctl_errno = 0;
1946
if(not get_flags(interface, &network) and debug){
1947
ret_errno = errno;
1948
fprintf_plus(stderr, "Failed to get flags for interface "
1949
"\"%s\"\n", interface);
1950
errno = old_errno;
1951
return ret_errno;
1952
}
1953
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1954
1955
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1956
if(sd == -1){
1957
ret_errno = errno;
1958
perror_plus("socket");
1959
errno = old_errno;
1960
return ret_errno;
1961
}
1962
1963
if(debug){
1964
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1965
interface);
1966
}
1967
1968
/* Raise privileges */
1969
ret_errno = raise_privileges();
1970
if(ret_errno != 0){
1971
errno = ret_errno;
1972
perror_plus("Failed to raise privileges");
1973
}
1974
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1977
1978
/* If raise_privileges() succeeded above */
1979
if(ret_errno == 0){
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1982
if(ret_errno != 0){
1983
errno = ret_errno;
1984
perror_plus("Failed to lower privileges");
1985
}
1986
}
1987
1988
/* Close the socket */
1989
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1993
1994
if(ret_setflags == -1){
1995
errno = ioctl_errno;
1996
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1997
errno = old_errno;
1998
return ioctl_errno;
1999
}
2000
} else if(debug){
2001
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2002
interface);
2003
}
2004
2005
errno = old_errno;
2006
return 0;
2007
}
2008
1264
2009
int main(int argc, char *argv[]){
2010
mandos_context mc = { .server = NULL, .dh_bits = 0,
2011
.priority = "SECURE256:!CTYPE-X.509:"
2012
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2013
.interfaces = NULL, .interfaces_size = 0 };
1265
2014
AvahiSServiceBrowser *sb = NULL;
1266
int error;
2015
error_t ret_errno;
1267
2016
int ret;
1268
2017
intmax_t tmpmax;
1269
2018
char *tmp;
1270
2019
int exitcode = EXIT_SUCCESS;
1271
const char *interface = "";
1272
struct ifreq network;
1273
int sd = -1;
1274
bool take_down_interface = false;
1275
uid_t uid;
1276
gid_t gid;
1277
char tempdir[] = "/tmp/mandosXXXXXX";
1278
bool tempdir_created = false;
2020
char *interfaces_to_take_down = NULL;
2021
size_t interfaces_to_take_down_size = 0;
2022
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2023
char old_tempdir[] = "/tmp/mandosXXXXXX";
2024
char *tempdir = NULL;
1279
2025
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1280
2026
const char *seckey = PATHDIR "/" SECKEY;
1281
2027
const char *pubkey = PATHDIR "/" PUBKEY;
2028
char *interfaces_hooks = NULL;
1282
2029
1283
2030
bool gnutls_initialized = false;
1284
2031
bool gpgme_initialized = false;
1285
2032
float delay = 2.5f;
1286
double retry_interval = 10; /* 10s between retrying a server and checking again*/
2033
double retry_interval = 10; /* 10s between trying a server and
2034
retrying the same server again */
1287
2035
1288
2036
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1289
2037
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1345
2093
.group = 2 },
1346
2094
{ .name = "retry", .key = 132,
1347
2095
.arg = "SECONDS",
1348
.doc = "Retry interval used when denied by the mandos server",
2096
.doc = "Retry interval used when denied by the Mandos server",
2097
.group = 2 },
2098
{ .name = "network-hook-dir", .key = 133,
2099
.arg = "DIR",
2100
.doc = "Directory where network hooks are located",
1349
2101
.group = 2 },
1350
2102
/*
1351
2103
* These reproduce what we would get without ARGP_NO_HELP
1370
2122
connect_to = arg;
1371
2123
break;
1372
2124
case 'i': /* --interface */
1373
interface = arg;
2125
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2126
arg, (int)',');
2127
if(ret_errno != 0){
2128
argp_error(state, "%s", strerror(ret_errno));
2129
}
1374
2130
break;
1375
2131
case 's': /* --seckey */
1376
2132
seckey = arg;
1400
2156
errno = 0;
1401
2157
retry_interval = strtod(arg, &tmp);
1402
2158
if(errno != 0 or tmp == arg or *tmp != '\0'
1403
or (retry_interval * 1000) > INT_MAX){
2159
or (retry_interval * 1000) > INT_MAX
2160
or retry_interval < 0){
1404
2161
argp_error(state, "Bad retry interval");
1405
2162
}
1406
2163
break;
2164
case 133: /* --network-hook-dir */
2165
hookdir = arg;
2166
break;
1407
2167
/*
1408
2168
* These reproduce what we would get without ARGP_NO_HELP
1409
2169
*/
1415
2175
argp_state_help(state, state->out_stream,
1416
2176
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1417
2177
case 'V': /* --version */
1418
fprintf(state->out_stream, "%s\n", argp_program_version);
2178
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1419
2179
exit(argp_err_exit_status);
1420
2180
break;
1421
2181
default:
1444
2204
goto end;
1445
2205
}
1446
2206
}
2207
2208
{
2209
/* Work around Debian bug #633582:
2210
<http://bugs.debian.org/633582> */
2211
2212
/* Re-raise privileges */
2213
ret_errno = raise_privileges();
2214
if(ret_errno != 0){
2215
errno = ret_errno;
2216
perror_plus("Failed to raise privileges");
2217
} else {
2218
struct stat st;
2219
2220
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2221
int seckey_fd = open(seckey, O_RDONLY);
2222
if(seckey_fd == -1){
2223
perror_plus("open");
2224
} else {
2225
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2226
if(ret == -1){
2227
perror_plus("fstat");
2228
} else {
2229
if(S_ISREG(st.st_mode)
2230
and st.st_uid == 0 and st.st_gid == 0){
2231
ret = fchown(seckey_fd, uid, gid);
2232
if(ret == -1){
2233
perror_plus("fchown");
2234
}
2235
}
2236
}
2237
TEMP_FAILURE_RETRY(close(seckey_fd));
2238
}
2239
}
2240
2241
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2242
int pubkey_fd = open(pubkey, O_RDONLY);
2243
if(pubkey_fd == -1){
2244
perror_plus("open");
2245
} else {
2246
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2247
if(ret == -1){
2248
perror_plus("fstat");
2249
} else {
2250
if(S_ISREG(st.st_mode)
2251
and st.st_uid == 0 and st.st_gid == 0){
2252
ret = fchown(pubkey_fd, uid, gid);
2253
if(ret == -1){
2254
perror_plus("fchown");
2255
}
2256
}
2257
}
2258
TEMP_FAILURE_RETRY(close(pubkey_fd));
2259
}
2260
}
2261
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
2269
}
2270
2271
/* Remove invalid interface names (except "none") */
2272
{
2273
char *interface = NULL;
2274
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2275
interface))){
2276
if(strcmp(interface, "none") != 0
2277
and if_nametoindex(interface) == 0){
2278
if(interface[0] != '\0'){
2279
fprintf_plus(stderr, "Not using nonexisting interface"
2280
" \"%s\"\n", interface);
2281
}
2282
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2283
interface = NULL;
2284
}
2285
}
2286
}
2287
2288
/* Run network hooks */
2289
{
2290
if(mc.interfaces != NULL){
2291
interfaces_hooks = malloc(mc.interfaces_size);
2292
if(interfaces_hooks == NULL){
2293
perror_plus("malloc");
2294
goto end;
2295
}
2296
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2297
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2298
}
2299
run_network_hooks("start", interfaces_hooks != NULL ?
2300
interfaces_hooks : "", delay);
2301
}
1447
2302
1448
2303
if(not debug){
1449
2304
avahi_set_log_function(empty_log);
1450
2305
}
1451
1452
if(interface[0] == '\0'){
1453
struct dirent **direntries;
1454
ret = scandir(sys_class_net, &direntries, good_interface,
1455
alphasort);
1456
if(ret >= 1){
1457
/* Pick the first good interface */
1458
interface = strdup(direntries[0]->d_name);
1459
if(debug){
1460
fprintf(stderr, "Using interface \"%s\"\n", interface);
1461
}
1462
if(interface == NULL){
1463
perror_plus("malloc");
1464
free(direntries);
1465
exitcode = EXIT_FAILURE;
1466
goto end;
1467
}
1468
free(direntries);
1469
} else {
1470
free(direntries);
1471
fprintf(stderr, "Could not find a network interface\n");
1472
exitcode = EXIT_FAILURE;
1473
goto end;
1474
}
1475
}
1476
2306
1477
2307
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1478
2308
from the signal handler */
1479
2309
/* Initialize the pseudo-RNG for Avahi */
1480
2310
srand((unsigned int) time(NULL));
1481
mc.simple_poll = avahi_simple_poll_new();
1482
if(mc.simple_poll == NULL){
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2311
simple_poll = avahi_simple_poll_new();
2312
if(simple_poll == NULL){
2313
fprintf_plus(stderr,
2314
"Avahi: Failed to create simple poll object.\n");
1484
2315
exitcode = EX_UNAVAILABLE;
1485
2316
goto end;
1486
2317
}
1548
2379
}
1549
2380
}
1550
2381
1551
/* If the interface is down, bring it up */
1552
if(strcmp(interface, "none") != 0){
1553
if_index = (AvahiIfIndex) if_nametoindex(interface);
1554
if(if_index == 0){
1555
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1556
exitcode = EX_UNAVAILABLE;
1557
goto end;
1558
}
1559
1560
if(quit_now){
1561
goto end;
1562
}
1563
1564
/* Re-raise priviliges */
1565
errno = 0;
1566
ret = seteuid(0);
1567
if(ret == -1){
1568
perror_plus("seteuid");
1569
}
1570
1571
#ifdef __linux__
1572
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1573
messages about the network interface to mess up the prompt */
1574
ret = klogctl(8, NULL, 5);
1575
bool restore_loglevel = true;
1576
if(ret == -1){
1577
restore_loglevel = false;
1578
perror_plus("klogctl");
1579
}
1580
#endif /* __linux__ */
1581
1582
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1583
if(sd < 0){
1584
perror_plus("socket");
1585
exitcode = EX_OSERR;
1586
#ifdef __linux__
1587
if(restore_loglevel){
1588
ret = klogctl(7, NULL, 0);
1589
if(ret == -1){
1590
perror_plus("klogctl");
1591
}
1592
}
1593
#endif /* __linux__ */
1594
/* Lower privileges */
1595
errno = 0;
1596
ret = seteuid(uid);
1597
if(ret == -1){
1598
perror_plus("seteuid");
1599
}
1600
goto end;
1601
}
1602
strcpy(network.ifr_name, interface);
1603
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1604
if(ret == -1){
1605
perror_plus("ioctl SIOCGIFFLAGS");
1606
#ifdef __linux__
1607
if(restore_loglevel){
1608
ret = klogctl(7, NULL, 0);
1609
if(ret == -1){
1610
perror_plus("klogctl");
1611
}
1612
}
1613
#endif /* __linux__ */
1614
exitcode = EX_OSERR;
1615
/* Lower privileges */
1616
errno = 0;
1617
ret = seteuid(uid);
1618
if(ret == -1){
1619
perror_plus("seteuid");
1620
}
1621
goto end;
1622
}
1623
if((network.ifr_flags & IFF_UP) == 0){
1624
network.ifr_flags |= IFF_UP;
1625
take_down_interface = true;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
if(ret == -1){
1628
take_down_interface = false;
1629
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1630
exitcode = EX_OSERR;
1631
#ifdef __linux__
1632
if(restore_loglevel){
1633
ret = klogctl(7, NULL, 0);
1634
if(ret == -1){
1635
perror_plus("klogctl");
2382
/* If no interfaces were specified, make a list */
2383
if(mc.interfaces == NULL){
2384
struct dirent **direntries = NULL;
2385
/* Look for any good interfaces */
2386
ret = scandir(sys_class_net, &direntries, good_interface,
2387
alphasort);
2388
if(ret >= 1){
2389
/* Add all found interfaces to interfaces list */
2390
for(int i = 0; i < ret; ++i){
2391
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2392
direntries[i]->d_name);
2393
if(ret_errno != 0){
2394
errno = ret_errno;
2395
perror_plus("argz_add");
2396
free(direntries[i]);
2397
continue;
2398
}
2399
if(debug){
2400
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2401
direntries[i]->d_name);
2402
}
2403
free(direntries[i]);
2404
}
2405
free(direntries);
2406
} else {
2407
if(ret == 0){
2408
free(direntries);
2409
}
2410
fprintf_plus(stderr, "Could not find a network interface\n");
2411
exitcode = EXIT_FAILURE;
2412
goto end;
2413
}
2414
}
2415
2416
/* Bring up interfaces which are down, and remove any "none"s */
2417
{
2418
char *interface = NULL;
2419
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2420
interface))){
2421
/* If interface name is "none", stop bringing up interfaces.
2422
Also remove all instances of "none" from the list */
2423
if(strcmp(interface, "none") == 0){
2424
argz_delete(&mc.interfaces, &mc.interfaces_size,
2425
interface);
2426
interface = NULL;
2427
while((interface = argz_next(mc.interfaces,
2428
mc.interfaces_size, interface))){
2429
if(strcmp(interface, "none") == 0){
2430
argz_delete(&mc.interfaces, &mc.interfaces_size,
2431
interface);
2432
interface = NULL;
1636
2433
}
1637
2434
}
1638
#endif /* __linux__ */
1639
/* Lower privileges */
1640
errno = 0;
1641
ret = seteuid(uid);
1642
if(ret == -1){
1643
perror_plus("seteuid");
1644
}
1645
goto end;
1646
}
1647
}
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1649
for(int i=0; i < delay * 4; i++){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror_plus("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_RUNNING){
1654
2435
break;
1655
2436
}
1656
struct timespec sleeptime = { .tv_nsec = 250000000 };
1657
ret = nanosleep(&sleeptime, NULL);
1658
if(ret == -1 and errno != EINTR){
1659
perror_plus("nanosleep");
1660
}
1661
}
1662
if(not take_down_interface){
1663
/* We won't need the socket anymore */
1664
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1665
if(ret == -1){
1666
perror_plus("close");
1667
}
1668
}
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1673
if(ret == -1){
1674
perror_plus("klogctl");
1675
}
1676
}
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
errno = 0;
1680
if(take_down_interface){
1681
/* Lower privileges */
1682
ret = seteuid(uid);
1683
if(ret == -1){
1684
perror_plus("seteuid");
1685
}
1686
} else {
1687
/* Lower privileges permanently */
1688
ret = setuid(uid);
1689
if(ret == -1){
1690
perror_plus("setuid");
1691
}
1692
}
2437
bool interface_was_up = interface_is_up(interface);
2438
errno = bring_up_interface(interface, delay);
2439
if(not interface_was_up){
2440
if(errno != 0){
2441
perror_plus("Failed to bring up interface");
2442
} else {
2443
errno = argz_add(&interfaces_to_take_down,
2444
&interfaces_to_take_down_size,
2445
interface);
2446
if(errno != 0){
2447
perror_plus("argz_add");
2448
}
2449
}
2450
}
2451
}
2452
if(debug and (interfaces_to_take_down == NULL)){
2453
fprintf_plus(stderr, "No interfaces were brought up\n");
2454
}
2455
}
2456
2457
/* If we only got one interface, explicitly use only that one */
2458
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2459
if(debug){
2460
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2461
mc.interfaces);
2462
}
2463
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1693
2464
}
1694
2465
1695
2466
if(quit_now){
1696
2467
goto end;
1697
2468
}
1698
2469
1699
ret = init_gnutls_global(pubkey, seckey);
2470
ret = init_gnutls_global(pubkey, seckey, &mc);
1700
2471
if(ret == -1){
1701
fprintf(stderr, "init_gnutls_global failed\n");
2472
fprintf_plus(stderr, "init_gnutls_global failed\n");
1702
2473
exitcode = EX_UNAVAILABLE;
1703
2474
goto end;
1704
2475
} else {
1709
2480
goto end;
1710
2481
}
1711
2482
1712
if(mkdtemp(tempdir) == NULL){
2483
/* Try /run/tmp before /tmp */
2484
tempdir = mkdtemp(run_tempdir);
2485
if(tempdir == NULL and errno == ENOENT){
2486
if(debug){
2487
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2488
run_tempdir, old_tempdir);
2489
}
2490
tempdir = mkdtemp(old_tempdir);
2491
}
2492
if(tempdir == NULL){
1713
2493
perror_plus("mkdtemp");
1714
2494
goto end;
1715
2495
}
1716
tempdir_created = true;
1717
2496
1718
2497
if(quit_now){
1719
2498
goto end;
1720
2499
}
1721
2500
1722
if(not init_gpgme(pubkey, seckey, tempdir)){
1723
fprintf(stderr, "init_gpgme failed\n");
2501
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2502
fprintf_plus(stderr, "init_gpgme failed\n");
1724
2503
exitcode = EX_UNAVAILABLE;
1725
2504
goto end;
1726
2505
} else {
1735
2514
/* Connect directly, do not use Zeroconf */
1736
2515
/* (Mainly meant for debugging) */
1737
2516
char *address = strrchr(connect_to, ':');
2517
1738
2518
if(address == NULL){
1739
fprintf(stderr, "No colon in address\n");
2519
fprintf_plus(stderr, "No colon in address\n");
1740
2520
exitcode = EX_USAGE;
1741
2521
goto end;
1742
2522
}
1745
2525
goto end;
1746
2526
}
1747
2527
1748
uint16_t port;
2528
in_port_t port;
1749
2529
errno = 0;
1750
2530
tmpmax = strtoimax(address+1, &tmp, 10);
1751
2531
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1752
or tmpmax != (uint16_t)tmpmax){
1753
fprintf(stderr, "Bad port number\n");
2532
or tmpmax != (in_port_t)tmpmax){
2533
fprintf_plus(stderr, "Bad port number\n");
1754
2534
exitcode = EX_USAGE;
1755
2535
goto end;
1756
2536
}
1757
2537
1758
2538
if(quit_now){
1759
2539
goto end;
1760
2540
}
1761
2541
1762
port = (uint16_t)tmpmax;
2542
port = (in_port_t)tmpmax;
1763
2543
*address = '\0';
1764
address = connect_to;
1765
2544
/* Colon in address indicates IPv6 */
1766
2545
int af;
1767
if(strchr(address, ':') != NULL){
2546
if(strchr(connect_to, ':') != NULL){
1768
2547
af = AF_INET6;
2548
/* Accept [] around IPv6 address - see RFC 5952 */
2549
if(connect_to[0] == '[' and address[-1] == ']')
2550
{
2551
connect_to++;
2552
address[-1] = '\0';
2553
}
1769
2554
} else {
1770
2555
af = AF_INET;
1771
2556
}
2557
address = connect_to;
1772
2558
1773
2559
if(quit_now){
1774
2560
goto end;
1775
2561
}
1776
2562
1777
2563
while(not quit_now){
1778
ret = start_mandos_communication(address, port, if_index, af);
2564
ret = start_mandos_communication(address, port, if_index, af,
2565
&mc);
1779
2566
if(quit_now or ret == 0){
1780
2567
break;
1781
2568
}
1782
sleep((int)retry_interval or 1);
1783
};
1784
1785
if (not quit_now){
2569
if(debug){
2570
fprintf_plus(stderr, "Retrying in %d seconds\n",
2571
(int)retry_interval);
2572
}
2573
sleep((unsigned int)retry_interval);
2574
}
2575
2576
if(not quit_now){
1786
2577
exitcode = EXIT_SUCCESS;
1787
2578
}
1788
2579
1789
2580
goto end;
1790
2581
}
1791
2582
1803
2594
config.publish_domain = 0;
1804
2595
1805
2596
/* Allocate a new server */
1806
mc.server = avahi_server_new(avahi_simple_poll_get
1807
(mc.simple_poll), &config, NULL,
1808
NULL, &error);
2597
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2598
&config, NULL, NULL, &ret_errno);
1809
2599
1810
2600
/* Free the Avahi configuration data */
1811
2601
avahi_server_config_free(&config);
1813
2603
1814
2604
/* Check if creating the Avahi server object succeeded */
1815
2605
if(mc.server == NULL){
1816
fprintf(stderr, "Failed to create Avahi server: %s\n",
1817
avahi_strerror(error));
2606
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2607
avahi_strerror(ret_errno));
1818
2608
exitcode = EX_UNAVAILABLE;
1819
2609
goto end;
1820
2610
}
1826
2616
/* Create the Avahi service browser */
1827
2617
sb = avahi_s_service_browser_new(mc.server, if_index,
1828
2618
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1829
NULL, 0, browse_callback, NULL);
2619
NULL, 0, browse_callback,
2620
(void *)&mc);
1830
2621
if(sb == NULL){
1831
fprintf(stderr, "Failed to create service browser: %s\n",
1832
avahi_strerror(avahi_server_errno(mc.server)));
2622
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2623
avahi_strerror(avahi_server_errno(mc.server)));
1833
2624
exitcode = EX_UNAVAILABLE;
1834
2625
goto end;
1835
2626
}
1841
2632
/* Run the main loop */
1842
2633
1843
2634
if(debug){
1844
fprintf(stderr, "Starting Avahi loop search\n");
2635
fprintf_plus(stderr, "Starting Avahi loop search\n");
1845
2636
}
1846
1847
ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));
2637
2638
ret = avahi_loop_with_timeout(simple_poll,
2639
(int)(retry_interval * 1000), &mc);
1848
2640
if(debug){
1849
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1850
(ret == 0) ? "successfully" : "with error");
2641
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2642
(ret == 0) ? "successfully" : "with error");
1851
2643
}
1852
2644
1853
2645
end:
1854
2646
1855
2647
if(debug){
1856
fprintf(stderr, "%s exiting\n", argv[0]);
2648
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1857
2649
}
1858
2650
1859
2651
/* Cleanup things */
2652
free(mc.interfaces);
2653
1860
2654
if(sb != NULL)
1861
2655
avahi_s_service_browser_free(sb);
1862
2656
1863
2657
if(mc.server != NULL)
1864
2658
avahi_server_free(mc.server);
1865
2659
1866
if(mc.simple_poll != NULL)
1867
avahi_simple_poll_free(mc.simple_poll);
2660
if(simple_poll != NULL)
2661
avahi_simple_poll_free(simple_poll);
1868
2662
1869
2663
if(gnutls_initialized){
1870
2664
gnutls_certificate_free_credentials(mc.cred);
1875
2669
if(gpgme_initialized){
1876
2670
gpgme_release(mc.ctx);
1877
2671
}
1878
1879
/* cleans up the circular linked list of mandos servers the client has seen */
2672
2673
/* Cleans up the circular linked list of Mandos servers the client
2674
has seen */
1880
2675
if(mc.current_server != NULL){
1881
2676
mc.current_server->prev->next = NULL;
1882
2677
while(mc.current_server != NULL){
1883
2678
server *next = mc.current_server->next;
2679
#ifdef __GNUC__
2680
#pragma GCC diagnostic push
2681
#pragma GCC diagnostic ignored "-Wcast-qual"
2682
#endif
2683
free((char *)(mc.current_server->ip));
2684
#ifdef __GNUC__
2685
#pragma GCC diagnostic pop
2686
#endif
1884
2687
free(mc.current_server);
1885
2688
mc.current_server = next;
1886
2689
}
1887
2690
}
1888
2691
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
1892
errno = 0;
1893
ret = seteuid(0);
1894
if(ret == -1){
1895
perror_plus("seteuid");
2692
/* Re-raise privileges */
2693
{
2694
ret_errno = raise_privileges();
2695
if(ret_errno != 0){
2696
errno = ret_errno;
2697
perror_plus("Failed to raise privileges");
2698
} else {
2699
2700
/* Run network hooks */
2701
run_network_hooks("stop", interfaces_hooks != NULL ?
2702
interfaces_hooks : "", delay);
2703
2704
/* Take down the network interfaces which were brought up */
2705
{
2706
char *interface = NULL;
2707
while((interface=argz_next(interfaces_to_take_down,
2708
interfaces_to_take_down_size,
2709
interface))){
2710
ret_errno = take_down_interface(interface);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
2713
perror_plus("Failed to take down interface");
2714
}
2715
}
2716
if(debug and (interfaces_to_take_down == NULL)){
2717
fprintf_plus(stderr, "No interfaces needed to be taken"
2718
" down\n");
2719
}
2720
}
1896
2721
}
1897
if(geteuid() == 0){
1898
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1899
if(ret == -1){
1900
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
1902
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1904
if(ret == -1){
1905
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1906
}
1907
}
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1912
/* Lower privileges permanently */
1913
errno = 0;
1914
ret = setuid(uid);
1915
if(ret == -1){
1916
perror_plus("setuid");
1917
}
2722
2723
ret_errno = lower_privileges_permanently();
2724
if(ret_errno != 0){
2725
errno = ret_errno;
2726
perror_plus("Failed to lower privileges permanently");
1918
2727
}
1919
2728
}
1920
2729
2730
free(interfaces_to_take_down);
2731
free(interfaces_hooks);
2732
1921
2733
/* Removes the GPGME temp directory and all files inside */
1922
if(tempdir_created){
2734
if(tempdir != NULL){
1923
2735
struct dirent **direntries = NULL;
1924
struct dirent *direntry = NULL;
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1926
if (ret > 0){
1927
for(int i = 0; i < ret; i++){
1928
direntry = direntries[i];
1929
char *fullname = NULL;
1930
ret = asprintf(&fullname, "%s/%s", tempdir,
1931
direntry->d_name);
1932
if(ret < 0){
1933
perror_plus("asprintf");
1934
continue;
1935
}
1936
ret = remove(fullname);
1937
if(ret == -1){
1938
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1939
strerror(errno));
1940
}
1941
free(fullname);
2736
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2737
O_NOFOLLOW));
2738
if(tempdir_fd == -1){
2739
perror_plus("open");
2740
} else {
2741
#ifdef __GLIBC__
2742
#if __GLIBC_PREREQ(2, 15)
2743
int numentries = scandirat(tempdir_fd, ".", &direntries,
2744
notdotentries, alphasort);
2745
#else /* not __GLIBC_PREREQ(2, 15) */
2746
int numentries = scandir(tempdir, &direntries, notdotentries,
2747
alphasort);
2748
#endif /* not __GLIBC_PREREQ(2, 15) */
2749
#else /* not __GLIBC__ */
2750
int numentries = scandir(tempdir, &direntries, notdotentries,
2751
alphasort);
2752
#endif /* not __GLIBC__ */
2753
if(numentries >= 0){
2754
for(int i = 0; i < numentries; i++){
2755
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2756
if(ret == -1){
2757
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2758
" \"%s\", 0): %s\n", tempdir,
2759
direntries[i]->d_name, strerror(errno));
2760
}
2761
free(direntries[i]);
2762
}
2763
2764
/* need to clean even if 0 because man page doesn't specify */
2765
free(direntries);
2766
if(numentries == -1){
2767
perror_plus("scandir");
2768
}
2769
ret = rmdir(tempdir);
2770
if(ret == -1 and errno != ENOENT){
2771
perror_plus("rmdir");
2772
}
1942
2773
}
1943
}
1944
1945
/* need to be cleaned even if ret == 0 because man page dont specify */
1946
free(direntries);
1947
if (ret == -1){
1948
perror_plus("scandir");
1949
}
1950
ret = rmdir(tempdir);
1951
if(ret == -1 and errno != ENOENT){
1952
perror_plus("rmdir");
2774
TEMP_FAILURE_RETRY(close(tempdir_fd));
1953
2775
}
1954
2776
}
1955
2777
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0