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- Committer: Teddy Hogeborn
- Date: 2012-06-16 23:25:46 UTC
- Revision ID: teddy@recompile.se-20120616232546-dcrkmnhd4yhq6mvd
* plugins.d/mandos-client (mandos_context): Moved to inside "main()".
All users changed.
(add_server): Take new "current_server" argument; all callers
changed.
(init_gpgme, pgp_packet_decrypt, init_gnutls_global,
init_gnutls_session, start_mandos_communication,
avahi_loop_with_timeout): Take new "mc" argument"; all callers
changed.
(resolve_callback, browse_callback): Handle void pointer userdata as
"mc", a pointer to
mandos_context. All callers
changed.
(main): New "mc" variable.
All users changed.
(add_server): Take new "current_server" argument; all callers
changed.
(init_gpgme, pgp_packet_decrypt, init_gnutls_global,
init_gnutls_session, start_mandos_communication,
avahi_loop_with_timeout): Take new "mc" argument"; all callers
changed.
(resolve_callback, browse_callback): Handle void pointer userdata as
"mc", a pointer to
mandos_context. All callers
changed.
(main): New "mc" variable.
- files added:
- debian/mandos-client.examples
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
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
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
64
#include <errno.h> /* perror(), errno,
66
65
program_invocation_short_name */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
75
setgid(), pause(), _exit() */
77
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
88
94
89
95
#ifdef __linux__
90
96
#include <sys/klog.h> /* klogctl() */
108
114
init_gnutls_session(),
109
115
GNUTLS_* */
110
116
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
113
119
114
120
/* GPGME */
115
121
#include <gpgme.h> /* All GPGME types, constants and
123
129
#define PATHDIR "/conf/conf.d/mandos"
124
130
#define SECKEY "seckey.txt"
125
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
133
127
134
bool debug = false;
128
135
static const char mandos_protocol_version[] = "1";
129
136
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
138
static const char sys_class_net[] = "/sys/class/net";
132
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
133
143
134
144
/* Doubly linked list that need to be circularly linked when used */
135
145
typedef struct server{
136
146
const char *ip;
137
uint16_t port;
147
in_port_t port;
138
148
AvahiIfIndex if_index;
139
149
int af;
140
150
struct timespec last_seen;
144
154
145
155
/* Used for passing in values through the Avahi callback functions */
146
156
typedef struct {
147
AvahiSimplePoll *simple_poll;
148
157
AvahiServer *server;
149
158
gnutls_certificate_credentials_t cred;
150
159
unsigned int dh_bits;
154
163
server *current_server;
155
164
} mandos_context;
156
165
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
166
/* global so signal handler can reach it*/
167
AvahiSimplePoll *simple_poll;
162
168
163
169
sig_atomic_t quit_now = 0;
164
170
int signal_received = 0;
165
171
166
172
/* Function to use when printing errors */
167
173
void perror_plus(const char *print_text){
174
int e = errno;
168
175
fprintf(stderr, "Mandos plugin %s: ",
169
176
program_invocation_short_name);
177
errno = e;
170
178
perror(print_text);
171
179
}
172
180
181
__attribute__((format (gnu_printf, 2, 3)))
182
int fprintf_plus(FILE *stream, const char *format, ...){
183
va_list ap;
184
va_start (ap, format);
185
186
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
187
program_invocation_short_name));
188
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
189
}
190
173
191
/*
174
192
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
193
* bytes. "buffer_capacity" is how much is currently allocated,
176
194
* "buffer_length" is how much is already used.
177
195
*/
178
196
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
197
size_t buffer_capacity){
180
198
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
199
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
200
if(buffer == NULL){
187
205
return buffer_capacity;
188
206
}
189
207
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
208
/* Add server to set of servers to retry periodically */
209
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
210
int af, server **current_server){
193
211
int ret;
194
212
server *new_server = malloc(sizeof(server));
195
213
if(new_server == NULL){
196
214
perror_plus("malloc");
197
return -1;
215
return false;
198
216
}
199
217
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
218
.port = port,
219
.if_index = if_index,
220
.af = af };
203
221
if(new_server->ip == NULL){
204
222
perror_plus("strdup");
205
return -1;
223
return false;
206
224
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
225
/* Special case of first server */
226
if(*current_server == NULL){
209
227
new_server->next = new_server;
210
228
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
229
*current_server = new_server;
230
/* Place the new server last in the list */
213
231
} else {
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
232
new_server->next = *current_server;
233
new_server->prev = (*current_server)->prev;
216
234
new_server->prev->next = new_server;
217
mc.current_server->prev = new_server;
235
(*current_server)->prev = new_server;
218
236
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
220
238
if(ret == -1){
221
239
perror_plus("clock_gettime");
222
return -1;
240
return false;
223
241
}
224
return 0;
242
return true;
225
243
}
226
244
227
245
/*
228
246
* Initialize GPGME.
229
247
*/
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
232
250
gpgme_error_t rc;
233
251
gpgme_engine_info_t engine_info;
234
252
235
236
253
/*
237
254
* Helper function to insert pub and seckey to the engine keyring.
238
255
*/
249
266
250
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
251
268
if(rc != GPG_ERR_NO_ERROR){
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
gpgme_strsource(rc), gpgme_strerror(rc));
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
254
271
return false;
255
272
}
256
273
257
rc = gpgme_op_import(mc.ctx, pgp_data);
274
rc = gpgme_op_import(mc->ctx, pgp_data);
258
275
if(rc != GPG_ERR_NO_ERROR){
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
261
278
return false;
262
279
}
263
280
270
287
}
271
288
272
289
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
274
291
}
275
292
276
293
/* Init GPGME */
277
294
gpgme_check_version(NULL);
278
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
279
296
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
282
299
return false;
283
300
}
284
301
285
/* Set GPGME home directory for the OpenPGP engine only */
302
/* Set GPGME home directory for the OpenPGP engine only */
286
303
rc = gpgme_get_engine_info(&engine_info);
287
304
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
290
307
return false;
291
308
}
292
309
while(engine_info != NULL){
298
315
engine_info = engine_info->next;
299
316
}
300
317
if(engine_info == NULL){
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
302
320
return false;
303
321
}
304
322
305
323
/* Create new GPGME "context" */
306
rc = gpgme_new(&(mc.ctx));
324
rc = gpgme_new(&(mc->ctx));
307
325
if(rc != GPG_ERR_NO_ERROR){
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
310
329
return false;
311
330
}
312
331
323
342
*/
324
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
325
344
size_t crypto_size,
326
char **plaintext){
345
char **plaintext,
346
mandos_context *mc){
327
347
gpgme_data_t dh_crypto, dh_plain;
328
348
gpgme_error_t rc;
329
349
ssize_t ret;
331
351
ssize_t plaintext_length = 0;
332
352
333
353
if(debug){
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
354
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
355
}
336
356
337
357
/* Create new GPGME data buffer from memory cryptotext */
338
358
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
339
359
0);
340
360
if(rc != GPG_ERR_NO_ERROR){
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
361
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
343
363
return -1;
344
364
}
345
365
346
366
/* Create new empty GPGME data buffer for the plaintext */
347
367
rc = gpgme_data_new(&dh_plain);
348
368
if(rc != GPG_ERR_NO_ERROR){
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
369
fprintf_plus(stderr, "Mandos plugin mandos-client: "
370
"bad gpgme_data_new: %s: %s\n",
371
gpgme_strsource(rc), gpgme_strerror(rc));
351
372
gpgme_data_release(dh_crypto);
352
373
return -1;
353
374
}
354
375
355
376
/* Decrypt data from the cryptotext data buffer to the plaintext
356
377
data buffer */
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
379
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
380
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
361
382
plaintext_length = -1;
362
383
if(debug){
363
384
gpgme_decrypt_result_t result;
364
result = gpgme_op_decrypt_result(mc.ctx);
385
result = gpgme_op_decrypt_result(mc->ctx);
365
386
if(result == NULL){
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
387
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
388
} else {
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
389
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
390
result->unsupported_algorithm);
391
fprintf_plus(stderr, "Wrong key usage: %u\n",
392
result->wrong_key_usage);
372
393
if(result->file_name != NULL){
373
fprintf(stderr, "File name: %s\n", result->file_name);
394
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
395
}
375
396
gpgme_recipient_t recipient;
376
397
recipient = result->recipients;
377
398
while(recipient != NULL){
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "No" : "Yes");
399
fprintf_plus(stderr, "Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name
401
(recipient->pubkey_algo));
402
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
403
fprintf_plus(stderr, "Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
384
406
recipient = recipient->next;
385
407
}
386
408
}
389
411
}
390
412
391
413
if(debug){
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
415
}
394
416
395
417
/* Seek back to the beginning of the GPGME plaintext data buffer */
402
424
*plaintext = NULL;
403
425
while(true){
404
426
plaintext_capacity = incbuffer(plaintext,
405
(size_t)plaintext_length,
406
plaintext_capacity);
427
(size_t)plaintext_length,
428
plaintext_capacity);
407
429
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
430
perror_plus("incbuffer");
431
plaintext_length = -1;
432
goto decrypt_end;
411
433
}
412
434
413
435
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
426
448
}
427
449
428
450
if(debug){
429
fprintf(stderr, "Decrypted password is: ");
451
fprintf_plus(stderr, "Decrypted password is: ");
430
452
for(ssize_t i = 0; i < plaintext_length; i++){
431
453
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
432
454
}
444
466
}
445
467
446
468
static const char * safer_gnutls_strerror(int value){
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
469
const char *ret = gnutls_strerror(value);
449
470
if(ret == NULL)
450
471
ret = "(unknown)";
451
472
return ret;
454
475
/* GnuTLS log function callback */
455
476
static void debuggnutls(__attribute__((unused)) int level,
456
477
const char* string){
457
fprintf(stderr, "GnuTLS: %s", string);
478
fprintf_plus(stderr, "GnuTLS: %s", string);
458
479
}
459
480
460
481
static int init_gnutls_global(const char *pubkeyfilename,
461
const char *seckeyfilename){
482
const char *seckeyfilename,
483
mandos_context *mc){
462
484
int ret;
463
485
464
486
if(debug){
465
fprintf(stderr, "Initializing GnuTLS\n");
487
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
488
}
467
489
468
490
ret = gnutls_global_init();
469
491
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
492
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
493
safer_gnutls_strerror(ret));
472
494
return -1;
473
495
}
474
496
481
503
}
482
504
483
505
/* OpenPGP credentials */
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
506
ret = gnutls_certificate_allocate_credentials(&mc->cred);
485
507
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
508
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
509
safer_gnutls_strerror(ret));
488
510
gnutls_global_deinit();
489
511
return -1;
490
512
}
491
513
492
514
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
515
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
516
" secret key %s as GnuTLS credentials\n",
517
pubkeyfilename,
518
seckeyfilename);
496
519
}
497
520
498
521
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
522
(mc->cred, pubkeyfilename, seckeyfilename,
500
523
GNUTLS_OPENPGP_FMT_BASE64);
501
524
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));
525
fprintf_plus(stderr,
526
"Error[%d] while reading the OpenPGP key pair ('%s',"
527
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
528
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
529
safer_gnutls_strerror(ret));
507
530
goto globalfail;
508
531
}
509
532
510
533
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
534
ret = gnutls_dh_params_init(&mc->dh_params);
512
535
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
536
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
537
" initialization: %s\n",
538
safer_gnutls_strerror(ret));
515
539
goto globalfail;
516
540
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
542
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
543
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
544
safer_gnutls_strerror(ret));
521
545
goto globalfail;
522
546
}
523
547
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
548
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
549
526
550
return 0;
527
551
528
552
globalfail:
529
553
530
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_certificate_free_credentials(mc->cred);
531
555
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
556
gnutls_dh_params_deinit(mc->dh_params);
533
557
return -1;
534
558
}
535
559
536
static int init_gnutls_session(gnutls_session_t *session){
560
static int init_gnutls_session(gnutls_session_t *session,
561
mandos_context *mc){
537
562
int ret;
538
563
/* GnuTLS session creation */
539
564
do {
543
568
}
544
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
570
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
548
574
}
549
575
550
576
{
551
577
const char *err;
552
578
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
579
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
554
580
if(quit_now){
555
581
gnutls_deinit(*session);
556
582
return -1;
557
583
}
558
584
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
585
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));
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
563
589
gnutls_deinit(*session);
564
590
return -1;
565
591
}
567
593
568
594
do {
569
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
596
mc->cred);
571
597
if(quit_now){
572
598
gnutls_deinit(*session);
573
599
return -1;
574
600
}
575
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
602
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
579
605
gnutls_deinit(*session);
580
606
return -1;
581
607
}
583
609
/* ignore client certificate if any. */
584
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
585
611
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
612
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
587
613
588
614
return 0;
589
615
}
593
619
__attribute__((unused)) const char *txt){}
594
620
595
621
/* Called when a Mandos server is found */
596
static int start_mandos_communication(const char *ip, uint16_t port,
622
static int start_mandos_communication(const char *ip, in_port_t port,
597
623
AvahiIfIndex if_index,
598
int af){
624
int af, mandos_context *mc){
599
625
int ret, tcp_sd = -1;
600
626
ssize_t sret;
601
627
union {
626
652
pf = PF_INET;
627
653
break;
628
654
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
656
errno = EINVAL;
631
657
return -1;
632
658
}
633
659
634
ret = init_gnutls_session(&session);
660
ret = init_gnutls_session(&session, mc);
635
661
if(ret != 0){
636
662
return -1;
637
663
}
638
664
639
665
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIuMAX "\n", ip, (uintmax_t)port);
642
668
}
643
669
644
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
670
696
}
671
697
if(ret == 0){
672
698
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
700
errno = e;
675
701
goto mandos_end;
676
702
}
677
703
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
704
to.in6.sin6_port = htons(port);
682
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
707
-Wunreachable-code*/
685
708
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
709
fprintf_plus(stderr, "An IPv6 link-local address is"
710
" incomplete without a network interface\n");
688
711
errno = EINVAL;
689
712
goto mandos_end;
690
713
}
708
731
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
732
perror_plus("if_indextoname");
710
733
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
713
736
}
714
737
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
717
740
}
718
741
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
742
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
729
752
perror_plus("inet_ntop");
730
753
} else {
731
754
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
733
756
}
734
757
}
735
758
}
763
786
while(true){
764
787
size_t out_size = strlen(out);
765
788
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
789
out_size - written));
767
790
if(ret == -1){
768
791
int e = errno;
769
792
perror_plus("write");
789
812
}
790
813
791
814
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
815
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
816
}
794
817
795
818
if(quit_now){
797
820
goto mandos_end;
798
821
}
799
822
800
/* Spurious warning from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
823
/* This casting via intptr_t is to eliminate warning about casting
824
an int to a pointer type. This is exactly how the GnuTLS Guile
825
function "set-session-transport-fd!" does it. */
826
gnutls_transport_set_ptr(session,
827
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
802
828
803
829
if(quit_now){
804
830
errno = EINTR;
815
841
816
842
if(ret != GNUTLS_E_SUCCESS){
817
843
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
844
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
845
gnutls_perror(ret);
820
846
}
821
847
errno = EPROTO;
825
851
/* Read OpenPGP packet that contains the wanted password */
826
852
827
853
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
854
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
855
" %s\n", ip);
830
856
}
831
857
832
858
while(true){
837
863
}
838
864
839
865
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
866
buffer_capacity);
841
867
if(buffer_capacity == 0){
842
868
int e = errno;
843
869
perror_plus("incbuffer");
870
896
}
871
897
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
898
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
899
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
900
"***\n");
874
901
gnutls_perror(ret);
875
902
errno = EPROTO;
876
903
goto mandos_end;
877
904
}
878
905
break;
879
906
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
907
fprintf_plus(stderr, "Unknown error while reading data from"
908
" encrypted session with Mandos server\n");
882
909
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
910
errno = EIO;
884
911
goto mandos_end;
889
916
}
890
917
891
918
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
919
fprintf_plus(stderr, "Closing TLS session\n");
893
920
}
894
921
895
922
if(quit_now){
907
934
908
935
if(buffer_length > 0){
909
936
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
937
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
938
&decrypted_buffer, mc);
913
939
if(decrypted_buffer_size >= 0){
914
940
915
941
written = 0;
925
951
if(ret == 0 and ferror(stdout)){
926
952
int e = errno;
927
953
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
954
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
955
strerror(errno));
930
956
}
931
957
errno = e;
932
958
goto mandos_end;
976
1002
AVAHI_GCC_UNUSED AvahiStringList *txt,
977
1003
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
1004
flags,
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1005
void* mc){
1006
if(r == NULL){
1007
return;
1008
}
981
1009
982
1010
/* Called whenever a service has been resolved successfully or
983
1011
timed out */
989
1017
switch(event){
990
1018
default:
991
1019
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)));
1020
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
domain,
1023
avahi_strerror(avahi_server_errno
1024
(((mandos_context*)mc)->server)));
995
1025
break;
996
1026
997
1027
case AVAHI_RESOLVER_FOUND:
999
1029
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1030
avahi_address_snprint(ip, sizeof(ip), address);
1001
1031
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);
1032
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
host_name, ip, (intmax_t)interface, port);
1005
1035
}
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1036
int ret = start_mandos_communication(ip, (in_port_t)port,
1037
interface,
1038
avahi_proto_to_af(proto),
1039
mc);
1008
1040
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1041
avahi_simple_poll_quit(simple_poll);
1010
1042
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1043
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto),
1045
&((mandos_context*)mc)->current_server)){
1046
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1047
" list\n", name);
1048
}
1013
1049
}
1014
1050
}
1015
1051
}
1025
1061
const char *domain,
1026
1062
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
1063
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1064
void* mc){
1065
if(b == NULL){
1066
return;
1067
}
1030
1068
1031
1069
/* Called whenever a new services becomes available on the LAN or
1032
1070
is removed from the LAN */
1039
1077
default:
1040
1078
case AVAHI_BROWSER_FAILURE:
1041
1079
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1080
fprintf_plus(stderr, "(Avahi browser) %s\n",
1081
avahi_strerror(avahi_server_errno
1082
(((mandos_context*)mc)->server)));
1083
avahi_simple_poll_quit(simple_poll);
1045
1084
return;
1046
1085
1047
1086
case AVAHI_BROWSER_NEW:
1050
1089
the callback function is called the Avahi server will free the
1051
1090
resolver for us. */
1052
1091
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)));
1092
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1093
interface, protocol, name, type,
1094
domain, protocol, 0,
1095
resolve_callback, mc) == NULL)
1096
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1097
" %s\n", name,
1098
avahi_strerror(avahi_server_errno
1099
(((mandos_context*)mc)->server)));
1058
1100
break;
1059
1101
1060
1102
case AVAHI_BROWSER_REMOVE:
1063
1105
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1106
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1107
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1108
fprintf_plus(stderr, "No Mandos server found, still"
1109
" searching...\n");
1067
1110
}
1068
1111
break;
1069
1112
}
1078
1121
signal_received = sig;
1079
1122
int old_errno = errno;
1080
1123
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1124
if(simple_poll != NULL){
1125
avahi_simple_poll_quit(simple_poll);
1083
1126
}
1084
1127
errno = old_errno;
1085
1128
}
1086
1129
1130
bool get_flags(const char *ifname, struct ifreq *ifr){
1131
int ret;
1132
error_t ret_errno;
1133
1134
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1135
if(s < 0){
1136
ret_errno = errno;
1137
perror_plus("socket");
1138
errno = ret_errno;
1139
return false;
1140
}
1141
strcpy(ifr->ifr_name, ifname);
1142
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1143
if(ret == -1){
1144
if(debug){
1145
ret_errno = errno;
1146
perror_plus("ioctl SIOCGIFFLAGS");
1147
errno = ret_errno;
1148
}
1149
return false;
1150
}
1151
return true;
1152
}
1153
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
if(debug){
1159
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1160
ifname);
1161
}
1162
return false;
1163
}
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
if(debug){
1167
fprintf_plus(stderr, "Accepting point-to-point interface"
1168
" \"%s\"\n", ifname);
1169
}
1170
return true;
1171
}
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
if(debug){
1175
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1176
" \"%s\"\n", ifname);
1177
}
1178
return false;
1179
}
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1182
if(debug){
1183
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1184
ifname);
1185
}
1186
return false;
1187
}
1188
1189
/* Accept this device */
1190
if(debug){
1191
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1192
}
1193
return true;
1194
}
1195
1087
1196
/*
1088
1197
* This function determines if a directory entry in /sys/class/net
1089
1198
* corresponds to an acceptable network device.
1090
1199
* (This function is passed to scandir(3) as a filter function.)
1091
1200
*/
1092
1201
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
1202
if(if_entry->d_name[0] == '.'){
1096
1203
return 0;
1097
1204
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
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);
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
if(not good_flags(if_entry->d_name, &ifr)){
1216
return 0;
1188
1217
}
1189
1218
return 1;
1190
1219
}
1191
1220
1221
/*
1222
* This function determines if a network interface is up.
1223
*/
1224
bool interface_is_up(const char *interface){
1225
struct ifreq ifr;
1226
if(not get_flags(interface, &ifr)){
1227
if(debug){
1228
fprintf_plus(stderr, "Failed to get flags for interface "
1229
"\"%s\"\n", interface);
1230
}
1231
return false;
1232
}
1233
1234
return (bool)(ifr.ifr_flags & IFF_UP);
1235
}
1236
1237
/*
1238
* This function determines if a network interface is running
1239
*/
1240
bool interface_is_running(const char *interface){
1241
struct ifreq ifr;
1242
if(not get_flags(interface, &ifr)){
1243
if(debug){
1244
fprintf_plus(stderr, "Failed to get flags for interface "
1245
"\"%s\"\n", interface);
1246
}
1247
return false;
1248
}
1249
1250
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1251
}
1252
1192
1253
int notdotentries(const struct dirent *direntry){
1193
1254
/* Skip "." and ".." */
1194
1255
if(direntry->d_name[0] == '.'
1200
1261
return 1;
1201
1262
}
1202
1263
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1264
/* Is this directory entry a runnable program? */
1265
int runnable_hook(const struct dirent *direntry){
1266
int ret;
1267
size_t sret;
1268
struct stat st;
1269
1270
if((direntry->d_name)[0] == '\0'){
1271
/* Empty name? */
1272
return 0;
1273
}
1274
1275
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1276
"abcdefghijklmnopqrstuvwxyz"
1277
"0123456789"
1278
"_-");
1279
if((direntry->d_name)[sret] != '\0'){
1280
/* Contains non-allowed characters */
1281
if(debug){
1282
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1283
direntry->d_name);
1284
}
1285
return 0;
1286
}
1287
1288
char *fullname = NULL;
1289
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1290
if(ret < 0){
1291
perror_plus("asprintf");
1292
return 0;
1293
}
1294
1295
ret = stat(fullname, &st);
1296
if(ret == -1){
1297
if(debug){
1298
perror_plus("Could not stat hook");
1299
}
1300
return 0;
1301
}
1302
if(not (S_ISREG(st.st_mode))){
1303
/* Not a regular file */
1304
if(debug){
1305
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1306
direntry->d_name);
1307
}
1308
return 0;
1309
}
1310
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1311
/* Not executable */
1312
if(debug){
1313
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1314
direntry->d_name);
1315
}
1316
return 0;
1317
}
1318
if(debug){
1319
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1320
direntry->d_name);
1321
}
1322
return 1;
1323
}
1324
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1326
mandos_context *mc){
1204
1327
int ret;
1205
1328
struct timespec now;
1206
1329
struct timespec waited_time;
1207
1330
intmax_t block_time;
1208
1331
1209
1332
while(true){
1210
if(mc.current_server == NULL){
1333
if(mc->current_server == NULL){
1211
1334
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1335
fprintf_plus(stderr, "Wait until first server is found."
1336
" No timeout!\n");
1214
1337
}
1215
1338
ret = avahi_simple_poll_iterate(s, -1);
1216
1339
} else {
1217
1340
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1341
fprintf_plus(stderr, "Check current_server if we should run"
1342
" it, or wait\n");
1220
1343
}
1221
1344
/* the current time */
1222
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1227
1350
/* Calculating in ms how long time between now and server
1228
1351
who we visted longest time ago. Now - last seen. */
1229
1352
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1353
- mc->current_server->last_seen.tv_sec);
1231
1354
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1355
- mc->current_server->last_seen.tv_nsec);
1233
1356
/* total time is 10s/10,000ms.
1234
1357
Converting to s from ms by dividing by 1,000,
1235
1358
and ns to ms by dividing by 1,000,000. */
1236
1359
block_time = ((retry_interval
1237
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1238
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1362
1240
1363
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1364
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1365
block_time);
1242
1366
}
1243
1367
1244
1368
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1369
ret = start_mandos_communication(mc->current_server->ip,
1370
mc->current_server->port,
1371
mc->current_server->if_index,
1372
mc->current_server->af, mc);
1249
1373
if(ret == 0){
1250
avahi_simple_poll_quit(mc.simple_poll);
1374
avahi_simple_poll_quit(s);
1251
1375
return 0;
1252
1376
}
1253
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1378
&mc->current_server->last_seen);
1255
1379
if(ret == -1){
1256
1380
perror_plus("clock_gettime");
1257
1381
return -1;
1258
1382
}
1259
mc.current_server = mc.current_server->next;
1383
mc->current_server = mc->current_server->next;
1260
1384
block_time = 0; /* Call avahi to find new Mandos
1261
1385
servers, but don't block */
1262
1386
}
1264
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
1389
}
1266
1390
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1391
if (ret > 0 or errno != EINTR){
1268
1392
return (ret != 1) ? ret : 0;
1269
1393
}
1270
1394
}
1271
1395
}
1272
1396
}
1273
1397
1398
/* Set effective uid to 0, return errno */
1399
error_t raise_privileges(void){
1400
error_t old_errno = errno;
1401
error_t ret_errno = 0;
1402
if(seteuid(0) == -1){
1403
ret_errno = errno;
1404
perror_plus("seteuid");
1405
}
1406
errno = old_errno;
1407
return ret_errno;
1408
}
1409
1410
/* Set effective and real user ID to 0. Return errno. */
1411
error_t raise_privileges_permanently(void){
1412
error_t old_errno = errno;
1413
error_t ret_errno = raise_privileges();
1414
if(ret_errno != 0){
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
if(setuid(0) == -1){
1419
ret_errno = errno;
1420
perror_plus("seteuid");
1421
}
1422
errno = old_errno;
1423
return ret_errno;
1424
}
1425
1426
/* Set effective user ID to unprivileged saved user ID */
1427
error_t lower_privileges(void){
1428
error_t old_errno = errno;
1429
error_t ret_errno = 0;
1430
if(seteuid(uid) == -1){
1431
ret_errno = errno;
1432
perror_plus("seteuid");
1433
}
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
/* Lower privileges permanently */
1439
error_t lower_privileges_permanently(void){
1440
error_t old_errno = errno;
1441
error_t ret_errno = 0;
1442
if(setuid(uid) == -1){
1443
ret_errno = errno;
1444
perror_plus("setuid");
1445
}
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
1450
bool run_network_hooks(const char *mode, const char *interface,
1451
const float delay){
1452
struct dirent **direntries;
1453
struct dirent *direntry;
1454
int ret;
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1456
alphasort);
1457
if(numhooks == -1){
1458
if(errno == ENOENT){
1459
if(debug){
1460
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1461
" found\n", hookdir);
1462
}
1463
} else {
1464
perror_plus("scandir");
1465
}
1466
} else {
1467
int devnull = open("/dev/null", O_RDONLY);
1468
for(int i = 0; i < numhooks; i++){
1469
direntry = direntries[i];
1470
char *fullname = NULL;
1471
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1472
if(ret < 0){
1473
perror_plus("asprintf");
1474
continue;
1475
}
1476
if(debug){
1477
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1478
direntry->d_name);
1479
}
1480
pid_t hook_pid = fork();
1481
if(hook_pid == 0){
1482
/* Child */
1483
/* Raise privileges */
1484
raise_privileges_permanently();
1485
/* Set group */
1486
errno = 0;
1487
ret = setgid(0);
1488
if(ret == -1){
1489
perror_plus("setgid");
1490
}
1491
/* Reset supplementary groups */
1492
errno = 0;
1493
ret = setgroups(0, NULL);
1494
if(ret == -1){
1495
perror_plus("setgroups");
1496
}
1497
dup2(devnull, STDIN_FILENO);
1498
close(devnull);
1499
dup2(STDERR_FILENO, STDOUT_FILENO);
1500
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("DEVICE", interface, 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
ret = setenv("MODE", mode, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
char *delaystring;
1521
ret = asprintf(&delaystring, "%f", delay);
1522
if(ret == -1){
1523
perror_plus("asprintf");
1524
_exit(EX_OSERR);
1525
}
1526
ret = setenv("DELAY", delaystring, 1);
1527
if(ret == -1){
1528
free(delaystring);
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1532
free(delaystring);
1533
if(connect_to != NULL){
1534
ret = setenv("CONNECT", connect_to, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
}
1540
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1541
perror_plus("execl");
1542
_exit(EXIT_FAILURE);
1543
}
1544
} else {
1545
int status;
1546
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1547
perror_plus("waitpid");
1548
free(fullname);
1549
continue;
1550
}
1551
if(WIFEXITED(status)){
1552
if(WEXITSTATUS(status) != 0){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1554
" with status %d\n", direntry->d_name,
1555
WEXITSTATUS(status));
1556
free(fullname);
1557
continue;
1558
}
1559
} else if(WIFSIGNALED(status)){
1560
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1561
" signal %d\n", direntry->d_name,
1562
WTERMSIG(status));
1563
free(fullname);
1564
continue;
1565
} else {
1566
fprintf_plus(stderr, "Warning: network hook \"%s\""
1567
" crashed\n", direntry->d_name);
1568
free(fullname);
1569
continue;
1570
}
1571
}
1572
free(fullname);
1573
if(debug){
1574
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1575
direntry->d_name);
1576
}
1577
}
1578
close(devnull);
1579
}
1580
return true;
1581
}
1582
1583
error_t bring_up_interface(const char *const interface,
1584
const float delay){
1585
int sd = -1;
1586
error_t old_errno = errno;
1587
error_t ret_errno = 0;
1588
int ret, ret_setflags;
1589
struct ifreq network;
1590
unsigned int if_index = if_nametoindex(interface);
1591
if(if_index == 0){
1592
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1593
errno = old_errno;
1594
return ENXIO;
1595
}
1596
1597
if(quit_now){
1598
errno = old_errno;
1599
return EINTR;
1600
}
1601
1602
if(not interface_is_up(interface)){
1603
if(not get_flags(interface, &network) and debug){
1604
ret_errno = errno;
1605
fprintf_plus(stderr, "Failed to get flags for interface "
1606
"\"%s\"\n", interface);
1607
return ret_errno;
1608
}
1609
network.ifr_flags |= IFF_UP;
1610
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1612
if(sd < 0){
1613
ret_errno = errno;
1614
perror_plus("socket");
1615
errno = old_errno;
1616
return ret_errno;
1617
}
1618
1619
if(quit_now){
1620
close(sd);
1621
errno = old_errno;
1622
return EINTR;
1623
}
1624
1625
if(debug){
1626
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1627
interface);
1628
}
1629
1630
/* Raise priviliges */
1631
raise_privileges();
1632
1633
#ifdef __linux__
1634
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1635
messages about the network interface to mess up the prompt */
1636
int ret_linux = klogctl(8, NULL, 5);
1637
bool restore_loglevel = true;
1638
if(ret_linux == -1){
1639
restore_loglevel = false;
1640
perror_plus("klogctl");
1641
}
1642
#endif /* __linux__ */
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1644
ret_errno = errno;
1645
#ifdef __linux__
1646
if(restore_loglevel){
1647
ret_linux = klogctl(7, NULL, 0);
1648
if(ret_linux == -1){
1649
perror_plus("klogctl");
1650
}
1651
}
1652
#endif /* __linux__ */
1653
1654
/* Lower privileges */
1655
lower_privileges();
1656
1657
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1659
if(ret == -1){
1660
perror_plus("close");
1661
}
1662
1663
if(ret_setflags == -1){
1664
errno = ret_errno;
1665
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1666
errno = old_errno;
1667
return ret_errno;
1668
}
1669
} else if(debug){
1670
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1671
interface);
1672
}
1673
1674
/* Sleep checking until interface is running.
1675
Check every 0.25s, up to total time of delay */
1676
for(int i=0; i < delay * 4; i++){
1677
if(interface_is_running(interface)){
1678
break;
1679
}
1680
struct timespec sleeptime = { .tv_nsec = 250000000 };
1681
ret = nanosleep(&sleeptime, NULL);
1682
if(ret == -1 and errno != EINTR){
1683
perror_plus("nanosleep");
1684
}
1685
}
1686
1687
errno = old_errno;
1688
return 0;
1689
}
1690
1691
error_t take_down_interface(const char *const interface){
1692
int sd = -1;
1693
error_t old_errno = errno;
1694
error_t ret_errno = 0;
1695
int ret, ret_setflags;
1696
struct ifreq network;
1697
unsigned int if_index = if_nametoindex(interface);
1698
if(if_index == 0){
1699
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1700
errno = old_errno;
1701
return ENXIO;
1702
}
1703
if(interface_is_up(interface)){
1704
if(not get_flags(interface, &network) and debug){
1705
ret_errno = errno;
1706
fprintf_plus(stderr, "Failed to get flags for interface "
1707
"\"%s\"\n", interface);
1708
return ret_errno;
1709
}
1710
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1711
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1713
if(sd < 0){
1714
ret_errno = errno;
1715
perror_plus("socket");
1716
errno = old_errno;
1717
return ret_errno;
1718
}
1719
1720
if(debug){
1721
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1722
interface);
1723
}
1724
1725
/* Raise priviliges */
1726
raise_privileges();
1727
1728
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1729
ret_errno = errno;
1730
1731
/* Lower privileges */
1732
lower_privileges();
1733
1734
/* Close the socket */
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1736
if(ret == -1){
1737
perror_plus("close");
1738
}
1739
1740
if(ret_setflags == -1){
1741
errno = ret_errno;
1742
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1743
errno = old_errno;
1744
return ret_errno;
1745
}
1746
} else if(debug){
1747
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1748
interface);
1749
}
1750
1751
errno = old_errno;
1752
return 0;
1753
}
1754
1274
1755
int main(int argc, char *argv[]){
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1757
.priority = "SECURE256:!CTYPE-X.509:"
1758
"+CTYPE-OPENPGP", .current_server = NULL };
1275
1759
AvahiSServiceBrowser *sb = NULL;
1276
int error;
1760
error_t ret_errno;
1277
1761
int ret;
1278
1762
intmax_t tmpmax;
1279
1763
char *tmp;
1280
1764
int exitcode = EXIT_SUCCESS;
1281
const char *interface = "";
1282
struct ifreq network;
1283
int sd = -1;
1284
bool take_down_interface = false;
1285
uid_t uid;
1286
gid_t gid;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1767
char *interfaces_to_take_down = NULL;
1768
size_t interfaces_to_take_down_size = 0;
1287
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1288
1770
bool tempdir_created = false;
1289
1771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1290
1772
const char *seckey = PATHDIR "/" SECKEY;
1291
1773
const char *pubkey = PATHDIR "/" PUBKEY;
1774
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1292
1776
1293
1777
bool gnutls_initialized = false;
1294
1778
bool gpgme_initialized = false;
1356
1840
.group = 2 },
1357
1841
{ .name = "retry", .key = 132,
1358
1842
.arg = "SECONDS",
1359
.doc = "Retry interval used when denied by the mandos server",
1843
.doc = "Retry interval used when denied by the Mandos server",
1844
.group = 2 },
1845
{ .name = "network-hook-dir", .key = 133,
1846
.arg = "DIR",
1847
.doc = "Directory where network hooks are located",
1360
1848
.group = 2 },
1361
1849
/*
1362
1850
* These reproduce what we would get without ARGP_NO_HELP
1381
1869
connect_to = arg;
1382
1870
break;
1383
1871
case 'i': /* --interface */
1384
interface = arg;
1872
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1873
(int)',');
1874
if(ret_errno != 0){
1875
argp_error(state, "%s", strerror(ret_errno));
1876
}
1385
1877
break;
1386
1878
case 's': /* --seckey */
1387
1879
seckey = arg;
1411
1903
errno = 0;
1412
1904
retry_interval = strtod(arg, &tmp);
1413
1905
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1906
or (retry_interval * 1000) > INT_MAX
1907
or retry_interval < 0){
1415
1908
argp_error(state, "Bad retry interval");
1416
1909
}
1417
1910
break;
1911
case 133: /* --network-hook-dir */
1912
hookdir = arg;
1913
break;
1418
1914
/*
1419
1915
* These reproduce what we would get without ARGP_NO_HELP
1420
1916
*/
1426
1922
argp_state_help(state, state->out_stream,
1427
1923
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
1924
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1925
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1430
1926
exit(argp_err_exit_status);
1431
1927
break;
1432
1928
default:
1455
1951
goto end;
1456
1952
}
1457
1953
}
1954
1955
{
1956
/* Work around Debian bug #633582:
1957
<http://bugs.debian.org/633582> */
1958
1959
/* Re-raise priviliges */
1960
if(raise_privileges() == 0){
1961
struct stat st;
1962
1963
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1964
int seckey_fd = open(seckey, O_RDONLY);
1965
if(seckey_fd == -1){
1966
perror_plus("open");
1967
} else {
1968
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1969
if(ret == -1){
1970
perror_plus("fstat");
1971
} else {
1972
if(S_ISREG(st.st_mode)
1973
and st.st_uid == 0 and st.st_gid == 0){
1974
ret = fchown(seckey_fd, uid, gid);
1975
if(ret == -1){
1976
perror_plus("fchown");
1977
}
1978
}
1979
}
1980
TEMP_FAILURE_RETRY(close(seckey_fd));
1981
}
1982
}
1983
1984
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1985
int pubkey_fd = open(pubkey, O_RDONLY);
1986
if(pubkey_fd == -1){
1987
perror_plus("open");
1988
} else {
1989
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1990
if(ret == -1){
1991
perror_plus("fstat");
1992
} else {
1993
if(S_ISREG(st.st_mode)
1994
and st.st_uid == 0 and st.st_gid == 0){
1995
ret = fchown(pubkey_fd, uid, gid);
1996
if(ret == -1){
1997
perror_plus("fchown");
1998
}
1999
}
2000
}
2001
TEMP_FAILURE_RETRY(close(pubkey_fd));
2002
}
2003
}
2004
2005
/* Lower privileges */
2006
errno = 0;
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2010
}
2011
}
2012
}
2013
2014
/* Remove empty interface names */
2015
{
2016
char *interface = NULL;
2017
while((interface = argz_next(interfaces, interfaces_size,
2018
interface))){
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2021
fprintf_plus(stderr, "Not using nonexisting interface"
2022
" \"%s\"\n", interface);
2023
}
2024
argz_delete(&interfaces, &interfaces_size, interface);
2025
interface = NULL;
2026
}
2027
}
2028
}
2029
2030
/* Run network hooks */
2031
{
2032
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2035
if(interfaces_hooks == NULL){
2036
perror_plus("malloc");
2037
goto end;
2038
}
2039
memcpy(interfaces_hooks, interfaces, interfaces_size);
2040
interfaces_hooks_size = interfaces_size;
2041
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2042
(int)',');
2043
}
2044
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2045
interfaces_hooks : "", delay)){
2046
goto end;
2047
}
2048
}
1458
2049
1459
2050
if(not debug){
1460
2051
avahi_set_log_function(empty_log);
1461
2052
}
1462
1463
if(interface[0] == '\0'){
1464
struct dirent **direntries;
1465
ret = scandir(sys_class_net, &direntries, good_interface,
1466
alphasort);
1467
if(ret >= 1){
1468
/* Pick the first good interface */
1469
interface = strdup(direntries[0]->d_name);
1470
if(debug){
1471
fprintf(stderr, "Using interface \"%s\"\n", interface);
1472
}
1473
if(interface == NULL){
1474
perror_plus("malloc");
1475
free(direntries);
1476
exitcode = EXIT_FAILURE;
1477
goto end;
1478
}
1479
free(direntries);
1480
} else {
1481
free(direntries);
1482
fprintf(stderr, "Could not find a network interface\n");
1483
exitcode = EXIT_FAILURE;
1484
goto end;
1485
}
1486
}
1487
2053
1488
2054
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1489
2055
from the signal handler */
1490
2056
/* Initialize the pseudo-RNG for Avahi */
1491
2057
srand((unsigned int) time(NULL));
1492
mc.simple_poll = avahi_simple_poll_new();
1493
if(mc.simple_poll == NULL){
1494
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2058
simple_poll = avahi_simple_poll_new();
2059
if(simple_poll == NULL){
2060
fprintf_plus(stderr,
2061
"Avahi: Failed to create simple poll object.\n");
1495
2062
exitcode = EX_UNAVAILABLE;
1496
2063
goto end;
1497
2064
}
1559
2126
}
1560
2127
}
1561
2128
1562
/* If the interface is down, bring it up */
1563
if(strcmp(interface, "none") != 0){
1564
if_index = (AvahiIfIndex) if_nametoindex(interface);
1565
if(if_index == 0){
1566
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1567
exitcode = EX_UNAVAILABLE;
1568
goto end;
1569
}
1570
1571
if(quit_now){
1572
goto end;
1573
}
1574
1575
/* Re-raise priviliges */
1576
errno = 0;
1577
ret = seteuid(0);
1578
if(ret == -1){
1579
perror_plus("seteuid");
1580
}
1581
1582
#ifdef __linux__
1583
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1584
messages about the network interface to mess up the prompt */
1585
ret = klogctl(8, NULL, 5);
1586
bool restore_loglevel = true;
1587
if(ret == -1){
1588
restore_loglevel = false;
1589
perror_plus("klogctl");
1590
}
1591
#endif /* __linux__ */
1592
1593
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1594
if(sd < 0){
1595
perror_plus("socket");
1596
exitcode = EX_OSERR;
1597
#ifdef __linux__
1598
if(restore_loglevel){
1599
ret = klogctl(7, NULL, 0);
1600
if(ret == -1){
1601
perror_plus("klogctl");
1602
}
1603
}
1604
#endif /* __linux__ */
1605
/* Lower privileges */
1606
errno = 0;
1607
ret = seteuid(uid);
1608
if(ret == -1){
1609
perror_plus("seteuid");
1610
}
1611
goto end;
1612
}
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
if(ret == -1){
1616
perror_plus("ioctl SIOCGIFFLAGS");
1617
#ifdef __linux__
1618
if(restore_loglevel){
1619
ret = klogctl(7, NULL, 0);
1620
if(ret == -1){
1621
perror_plus("klogctl");
1622
}
1623
}
1624
#endif /* __linux__ */
1625
exitcode = EX_OSERR;
1626
/* Lower privileges */
1627
errno = 0;
1628
ret = seteuid(uid);
1629
if(ret == -1){
1630
perror_plus("seteuid");
1631
}
1632
goto end;
1633
}
1634
if((network.ifr_flags & IFF_UP) == 0){
1635
network.ifr_flags |= IFF_UP;
1636
take_down_interface = true;
1637
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1638
if(ret == -1){
1639
take_down_interface = false;
1640
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1641
exitcode = EX_OSERR;
1642
#ifdef __linux__
1643
if(restore_loglevel){
1644
ret = klogctl(7, NULL, 0);
1645
if(ret == -1){
1646
perror_plus("klogctl");
1647
}
1648
}
1649
#endif /* __linux__ */
1650
/* Lower privileges */
1651
errno = 0;
1652
ret = seteuid(uid);
1653
if(ret == -1){
1654
perror_plus("seteuid");
1655
}
1656
goto end;
1657
}
1658
}
1659
/* Sleep checking until interface is running.
1660
Check every 0.25s, up to total time of delay */
1661
for(int i=0; i < delay * 4; i++){
1662
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1663
if(ret == -1){
1664
perror_plus("ioctl SIOCGIFFLAGS");
1665
} else if(network.ifr_flags & IFF_RUNNING){
1666
break;
1667
}
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1672
}
1673
}
1674
if(not take_down_interface){
1675
/* We won't need the socket anymore */
1676
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1677
if(ret == -1){
1678
perror_plus("close");
1679
}
1680
}
1681
#ifdef __linux__
1682
if(restore_loglevel){
1683
/* Restores kernel loglevel to default */
1684
ret = klogctl(7, NULL, 0);
1685
if(ret == -1){
1686
perror_plus("klogctl");
1687
}
1688
}
1689
#endif /* __linux__ */
1690
/* Lower privileges */
1691
errno = 0;
1692
if(take_down_interface){
1693
/* Lower privileges */
1694
ret = seteuid(uid);
1695
if(ret == -1){
1696
perror_plus("seteuid");
1697
}
2129
/* If no interfaces were specified, make a list */
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2132
/* Look for any good interfaces */
2133
ret = scandir(sys_class_net, &direntries, good_interface,
2134
alphasort);
2135
if(ret >= 1){
2136
/* Add all found interfaces to interfaces list */
2137
for(int i = 0; i < ret; ++i){
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2139
direntries[i]->d_name);
2140
if(ret_errno != 0){
2141
perror_plus("argz_add");
2142
continue;
2143
}
2144
if(debug){
2145
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2146
direntries[i]->d_name);
2147
}
2148
}
2149
free(direntries);
1698
2150
} else {
1699
/* Lower privileges permanently */
1700
ret = setuid(uid);
1701
if(ret == -1){
1702
perror_plus("setuid");
2151
free(direntries);
2152
fprintf_plus(stderr, "Could not find a network interface\n");
2153
exitcode = EXIT_FAILURE;
2154
goto end;
2155
}
2156
}
2157
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2160
if(debug){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2162
interfaces);
2163
}
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2165
}
2166
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2170
char *interface = NULL;
2171
while((interface = argz_next(interfaces, interfaces_size,
2172
interface))){
2173
bool interface_was_up = interface_is_up(interface);
2174
ret = bring_up_interface(interface, delay);
2175
if(not interface_was_up){
2176
if(ret != 0){
2177
errno = ret;
2178
perror_plus("Failed to bring up interface");
2179
} else {
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2182
interface);
2183
}
1703
2184
}
1704
2185
}
2186
free(interfaces);
2187
interfaces = NULL;
2188
interfaces_size = 0;
2189
if(debug and (interfaces_to_take_down == NULL)){
2190
fprintf_plus(stderr, "No interfaces were brought up\n");
2191
}
1705
2192
}
1706
2193
1707
2194
if(quit_now){
1708
2195
goto end;
1709
2196
}
1710
2197
1711
ret = init_gnutls_global(pubkey, seckey);
2198
ret = init_gnutls_global(pubkey, seckey, &mc);
1712
2199
if(ret == -1){
1713
fprintf(stderr, "init_gnutls_global failed\n");
2200
fprintf_plus(stderr, "init_gnutls_global failed\n");
1714
2201
exitcode = EX_UNAVAILABLE;
1715
2202
goto end;
1716
2203
} else {
1731
2218
goto end;
1732
2219
}
1733
2220
1734
if(not init_gpgme(pubkey, seckey, tempdir)){
1735
fprintf(stderr, "init_gpgme failed\n");
2221
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2222
fprintf_plus(stderr, "init_gpgme failed\n");
1736
2223
exitcode = EX_UNAVAILABLE;
1737
2224
goto end;
1738
2225
} else {
1747
2234
/* Connect directly, do not use Zeroconf */
1748
2235
/* (Mainly meant for debugging) */
1749
2236
char *address = strrchr(connect_to, ':');
2237
1750
2238
if(address == NULL){
1751
fprintf(stderr, "No colon in address\n");
2239
fprintf_plus(stderr, "No colon in address\n");
1752
2240
exitcode = EX_USAGE;
1753
2241
goto end;
1754
2242
}
1757
2245
goto end;
1758
2246
}
1759
2247
1760
uint16_t port;
2248
in_port_t port;
1761
2249
errno = 0;
1762
2250
tmpmax = strtoimax(address+1, &tmp, 10);
1763
2251
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1764
or tmpmax != (uint16_t)tmpmax){
1765
fprintf(stderr, "Bad port number\n");
2252
or tmpmax != (in_port_t)tmpmax){
2253
fprintf_plus(stderr, "Bad port number\n");
1766
2254
exitcode = EX_USAGE;
1767
2255
goto end;
1768
2256
}
1771
2259
goto end;
1772
2260
}
1773
2261
1774
port = (uint16_t)tmpmax;
2262
port = (in_port_t)tmpmax;
1775
2263
*address = '\0';
1776
address = connect_to;
1777
2264
/* Colon in address indicates IPv6 */
1778
2265
int af;
1779
if(strchr(address, ':') != NULL){
2266
if(strchr(connect_to, ':') != NULL){
1780
2267
af = AF_INET6;
2268
/* Accept [] around IPv6 address - see RFC 5952 */
2269
if(connect_to[0] == '[' and address[-1] == ']')
2270
{
2271
connect_to++;
2272
address[-1] = '\0';
2273
}
1781
2274
} else {
1782
2275
af = AF_INET;
1783
2276
}
2277
address = connect_to;
1784
2278
1785
2279
if(quit_now){
1786
2280
goto end;
1787
2281
}
1788
2282
1789
2283
while(not quit_now){
1790
ret = start_mandos_communication(address, port, if_index, af);
2284
ret = start_mandos_communication(address, port, if_index, af,
2285
&mc);
1791
2286
if(quit_now or ret == 0){
1792
2287
break;
1793
2288
}
1794
sleep((int)retry_interval or 1);
1795
};
1796
2289
if(debug){
2290
fprintf_plus(stderr, "Retrying in %d seconds\n",
2291
(int)retry_interval);
2292
}
2293
sleep((int)retry_interval);
2294
}
2295
1797
2296
if (not quit_now){
1798
2297
exitcode = EXIT_SUCCESS;
1799
2298
}
1800
2299
1801
2300
goto end;
1802
2301
}
1803
2302
1815
2314
config.publish_domain = 0;
1816
2315
1817
2316
/* Allocate a new server */
1818
mc.server = avahi_server_new(avahi_simple_poll_get
1819
(mc.simple_poll), &config, NULL,
1820
NULL, &error);
2317
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2318
&config, NULL, NULL, &ret_errno);
1821
2319
1822
2320
/* Free the Avahi configuration data */
1823
2321
avahi_server_config_free(&config);
1825
2323
1826
2324
/* Check if creating the Avahi server object succeeded */
1827
2325
if(mc.server == NULL){
1828
fprintf(stderr, "Failed to create Avahi server: %s\n",
1829
avahi_strerror(error));
2326
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2327
avahi_strerror(ret_errno));
1830
2328
exitcode = EX_UNAVAILABLE;
1831
2329
goto end;
1832
2330
}
1838
2336
/* Create the Avahi service browser */
1839
2337
sb = avahi_s_service_browser_new(mc.server, if_index,
1840
2338
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1841
NULL, 0, browse_callback, NULL);
2339
NULL, 0, browse_callback,
2340
(void *)&mc);
1842
2341
if(sb == NULL){
1843
fprintf(stderr, "Failed to create service browser: %s\n",
1844
avahi_strerror(avahi_server_errno(mc.server)));
2342
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2343
avahi_strerror(avahi_server_errno(mc.server)));
1845
2344
exitcode = EX_UNAVAILABLE;
1846
2345
goto end;
1847
2346
}
1853
2352
/* Run the main loop */
1854
2353
1855
2354
if(debug){
1856
fprintf(stderr, "Starting Avahi loop search\n");
2355
fprintf_plus(stderr, "Starting Avahi loop search\n");
1857
2356
}
1858
2357
1859
ret = avahi_loop_with_timeout(mc.simple_poll,
1860
(int)(retry_interval * 1000));
2358
ret = avahi_loop_with_timeout(simple_poll,
2359
(int)(retry_interval * 1000), &mc);
1861
2360
if(debug){
1862
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1863
(ret == 0) ? "successfully" : "with error");
2361
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2362
(ret == 0) ? "successfully" : "with error");
1864
2363
}
1865
2364
1866
2365
end:
1867
2366
1868
2367
if(debug){
1869
fprintf(stderr, "%s exiting\n", argv[0]);
2368
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1870
2369
}
1871
2370
1872
2371
/* Cleanup things */
1876
2375
if(mc.server != NULL)
1877
2376
avahi_server_free(mc.server);
1878
2377
1879
if(mc.simple_poll != NULL)
1880
avahi_simple_poll_free(mc.simple_poll);
2378
if(simple_poll != NULL)
2379
avahi_simple_poll_free(simple_poll);
1881
2380
1882
2381
if(gnutls_initialized){
1883
2382
gnutls_certificate_free_credentials(mc.cred);
1888
2387
if(gpgme_initialized){
1889
2388
gpgme_release(mc.ctx);
1890
2389
}
1891
2390
1892
2391
/* Cleans up the circular linked list of Mandos servers the client
1893
2392
has seen */
1894
2393
if(mc.current_server != NULL){
1900
2399
}
1901
2400
}
1902
2401
1903
/* Take down the network interface */
1904
if(take_down_interface){
1905
/* Re-raise priviliges */
1906
errno = 0;
1907
ret = seteuid(0);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1911
if(geteuid() == 0){
1912
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1913
if(ret == -1){
1914
perror_plus("ioctl SIOCGIFFLAGS");
1915
} else if(network.ifr_flags & IFF_UP) {
1916
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1917
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1918
if(ret == -1){
1919
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2402
/* Re-raise priviliges */
2403
{
2404
raise_privileges();
2405
2406
/* Run network hooks */
2407
run_network_hooks("stop", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
2409
2410
/* Take down the network interfaces which were brought up */
2411
{
2412
char *interface = NULL;
2413
while((interface=argz_next(interfaces_to_take_down,
2414
interfaces_to_take_down_size,
2415
interface))){
2416
ret_errno = take_down_interface(interface);
2417
if(ret_errno != 0){
2418
errno = ret_errno;
2419
perror_plus("Failed to take down interface");
1920
2420
}
1921
2421
}
1922
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1923
if(ret == -1){
1924
perror_plus("close");
1925
}
1926
/* Lower privileges permanently */
1927
errno = 0;
1928
ret = setuid(uid);
1929
if(ret == -1){
1930
perror_plus("setuid");
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2424
" down\n");
1931
2425
}
1932
2426
}
2427
2428
lower_privileges_permanently();
1933
2429
}
1934
2430
2431
free(interfaces_to_take_down);
2432
free(interfaces_hooks);
2433
1935
2434
/* Removes the GPGME temp directory and all files inside */
1936
2435
if(tempdir_created){
1937
2436
struct dirent **direntries = NULL;
1938
2437
struct dirent *direntry = NULL;
1939
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1940
if (ret > 0){
1941
for(int i = 0; i < ret; i++){
2438
int numentries = scandir(tempdir, &direntries, notdotentries,
2439
alphasort);
2440
if (numentries > 0){
2441
for(int i = 0; i < numentries; i++){
1942
2442
direntry = direntries[i];
1943
2443
char *fullname = NULL;
1944
2444
ret = asprintf(&fullname, "%s/%s", tempdir,
1949
2449
}
1950
2450
ret = remove(fullname);
1951
2451
if(ret == -1){
1952
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1953
strerror(errno));
2452
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2453
strerror(errno));
1954
2454
}
1955
2455
free(fullname);
1956
2456
}
1957
2457
}
1958
2458
1959
/* need to be cleaned even if ret == 0 because man page doesn't
1960
specify */
2459
/* need to clean even if 0 because man page doesn't specify */
1961
2460
free(direntries);
1962
if (ret == -1){
2461
if (numentries == -1){
1963
2462
perror_plus("scandir");
1964
2463
}
1965
2464
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0