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- Committer: Teddy Hogeborn
- Date: 2011-07-25 18:52:11 UTC
- mfrom: (237.7.37 trunk)
- Revision ID: teddy@fukt.bsnet.se-20110725185211-wlitr9jvs70e1xh8
Merge from trunk.
- files removed:
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
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() */
64
65
#include <errno.h> /* perror(), errno,
65
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
setgid(), pause() */
76
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
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() */
94
88
95
89
#ifdef __linux__
96
90
#include <sys/klog.h> /* klogctl() */
114
108
init_gnutls_session(),
115
109
GNUTLS_* */
116
110
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
119
113
120
114
/* GPGME */
121
115
#include <gpgme.h> /* All GPGME types, constants and
129
123
#define PATHDIR "/conf/conf.d/mandos"
130
124
#define SECKEY "seckey.txt"
131
125
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
126
134
127
bool debug = false;
135
128
static const char mandos_protocol_version[] = "1";
136
129
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
138
131
static const char sys_class_net[] = "/sys/class/net";
139
132
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
133
144
134
/* Doubly linked list that need to be circularly linked when used */
145
135
typedef struct server{
146
136
const char *ip;
147
in_port_t port;
137
uint16_t port;
148
138
AvahiIfIndex if_index;
149
139
int af;
150
140
struct timespec last_seen;
154
144
155
145
/* Used for passing in values through the Avahi callback functions */
156
146
typedef struct {
147
AvahiSimplePoll *simple_poll;
157
148
AvahiServer *server;
158
149
gnutls_certificate_credentials_t cred;
159
150
unsigned int dh_bits;
163
154
server *current_server;
164
155
} mandos_context;
165
156
166
/* global so signal handler can reach it*/
167
AvahiSimplePoll *simple_poll;
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 };
168
162
169
163
sig_atomic_t quit_now = 0;
170
164
int signal_received = 0;
171
165
172
166
/* Function to use when printing errors */
173
167
void perror_plus(const char *print_text){
174
int e = errno;
175
168
fprintf(stderr, "Mandos plugin %s: ",
176
169
program_invocation_short_name);
177
errno = e;
178
170
perror(print_text);
179
171
}
180
172
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
191
173
/*
192
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
193
175
* bytes. "buffer_capacity" is how much is currently allocated,
194
176
* "buffer_length" is how much is already used.
195
177
*/
196
178
size_t incbuffer(char **buffer, size_t buffer_length,
197
size_t buffer_capacity){
179
size_t buffer_capacity){
198
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
199
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
200
182
if(buffer == NULL){
205
187
return buffer_capacity;
206
188
}
207
189
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){
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
211
193
int ret;
212
194
server *new_server = malloc(sizeof(server));
213
195
if(new_server == NULL){
214
196
perror_plus("malloc");
215
return false;
197
return -1;
216
198
}
217
199
*new_server = (server){ .ip = strdup(ip),
218
.port = port,
219
.if_index = if_index,
220
.af = af };
200
.port = port,
201
.if_index = if_index,
202
.af = af };
221
203
if(new_server->ip == NULL){
222
204
perror_plus("strdup");
223
return false;
205
return -1;
224
206
}
225
/* Special case of first server */
226
if(*current_server == NULL){
207
/* unique case of first server */
208
if (mc.current_server == NULL){
227
209
new_server->next = new_server;
228
210
new_server->prev = new_server;
229
*current_server = new_server;
230
/* Place the new server last in the list */
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
231
213
} else {
232
new_server->next = *current_server;
233
new_server->prev = (*current_server)->prev;
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
234
216
new_server->prev->next = new_server;
235
(*current_server)->prev = new_server;
217
mc.current_server->prev = new_server;
236
218
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
238
220
if(ret == -1){
239
221
perror_plus("clock_gettime");
240
return false;
222
return -1;
241
223
}
242
return true;
224
return 0;
243
225
}
244
226
245
227
/*
246
228
* Initialize GPGME.
247
229
*/
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
250
232
gpgme_error_t rc;
251
233
gpgme_engine_info_t engine_info;
252
234
235
253
236
/*
254
237
* Helper function to insert pub and seckey to the engine keyring.
255
238
*/
266
249
267
250
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
251
if(rc != GPG_ERR_NO_ERROR){
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
gpgme_strsource(rc), gpgme_strerror(rc));
271
254
return false;
272
255
}
273
256
274
rc = gpgme_op_import(mc->ctx, pgp_data);
257
rc = gpgme_op_import(mc.ctx, pgp_data);
275
258
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
278
261
return false;
279
262
}
280
263
287
270
}
288
271
289
272
if(debug){
290
fprintf_plus(stderr, "Initializing GPGME\n");
273
fprintf(stderr, "Initializing GPGME\n");
291
274
}
292
275
293
276
/* Init GPGME */
294
277
gpgme_check_version(NULL);
295
278
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
296
279
if(rc != GPG_ERR_NO_ERROR){
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
299
282
return false;
300
283
}
301
284
302
/* Set GPGME home directory for the OpenPGP engine only */
285
/* Set GPGME home directory for the OpenPGP engine only */
303
286
rc = gpgme_get_engine_info(&engine_info);
304
287
if(rc != GPG_ERR_NO_ERROR){
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
307
290
return false;
308
291
}
309
292
while(engine_info != NULL){
315
298
engine_info = engine_info->next;
316
299
}
317
300
if(engine_info == NULL){
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
302
return false;
321
303
}
322
304
323
305
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc->ctx));
306
rc = gpgme_new(&(mc.ctx));
325
307
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
329
310
return false;
330
311
}
331
312
342
323
*/
343
324
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
325
size_t crypto_size,
345
char **plaintext,
346
mandos_context *mc){
326
char **plaintext){
347
327
gpgme_data_t dh_crypto, dh_plain;
348
328
gpgme_error_t rc;
349
329
ssize_t ret;
351
331
ssize_t plaintext_length = 0;
352
332
353
333
if(debug){
354
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
355
335
}
356
336
357
337
/* Create new GPGME data buffer from memory cryptotext */
358
338
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
359
339
0);
360
340
if(rc != GPG_ERR_NO_ERROR){
361
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
363
343
return -1;
364
344
}
365
345
366
346
/* Create new empty GPGME data buffer for the plaintext */
367
347
rc = gpgme_data_new(&dh_plain);
368
348
if(rc != GPG_ERR_NO_ERROR){
369
fprintf_plus(stderr, "Mandos plugin mandos-client: "
370
"bad gpgme_data_new: %s: %s\n",
371
gpgme_strsource(rc), gpgme_strerror(rc));
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
372
351
gpgme_data_release(dh_crypto);
373
352
return -1;
374
353
}
375
354
376
355
/* Decrypt data from the cryptotext data buffer to the plaintext
377
356
data buffer */
378
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
379
358
if(rc != GPG_ERR_NO_ERROR){
380
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
382
361
plaintext_length = -1;
383
362
if(debug){
384
363
gpgme_decrypt_result_t result;
385
result = gpgme_op_decrypt_result(mc->ctx);
364
result = gpgme_op_decrypt_result(mc.ctx);
386
365
if(result == NULL){
387
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
388
367
} else {
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);
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
393
372
if(result->file_name != NULL){
394
fprintf_plus(stderr, "File name: %s\n", result->file_name);
373
fprintf(stderr, "File name: %s\n", result->file_name);
395
374
}
396
375
gpgme_recipient_t recipient;
397
376
recipient = result->recipients;
398
377
while(recipient != NULL){
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");
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");
406
384
recipient = recipient->next;
407
385
}
408
386
}
411
389
}
412
390
413
391
if(debug){
414
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
415
393
}
416
394
417
395
/* Seek back to the beginning of the GPGME plaintext data buffer */
424
402
*plaintext = NULL;
425
403
while(true){
426
404
plaintext_capacity = incbuffer(plaintext,
427
(size_t)plaintext_length,
428
plaintext_capacity);
405
(size_t)plaintext_length,
406
plaintext_capacity);
429
407
if(plaintext_capacity == 0){
430
perror_plus("incbuffer");
431
plaintext_length = -1;
432
goto decrypt_end;
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
433
411
}
434
412
435
413
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
448
426
}
449
427
450
428
if(debug){
451
fprintf_plus(stderr, "Decrypted password is: ");
429
fprintf(stderr, "Decrypted password is: ");
452
430
for(ssize_t i = 0; i < plaintext_length; i++){
453
431
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
454
432
}
466
444
}
467
445
468
446
static const char * safer_gnutls_strerror(int value){
469
const char *ret = gnutls_strerror(value);
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
470
449
if(ret == NULL)
471
450
ret = "(unknown)";
472
451
return ret;
475
454
/* GnuTLS log function callback */
476
455
static void debuggnutls(__attribute__((unused)) int level,
477
456
const char* string){
478
fprintf_plus(stderr, "GnuTLS: %s", string);
457
fprintf(stderr, "GnuTLS: %s", string);
479
458
}
480
459
481
460
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename,
483
mandos_context *mc){
461
const char *seckeyfilename){
484
462
int ret;
485
463
486
464
if(debug){
487
fprintf_plus(stderr, "Initializing GnuTLS\n");
465
fprintf(stderr, "Initializing GnuTLS\n");
488
466
}
489
467
490
468
ret = gnutls_global_init();
491
469
if(ret != GNUTLS_E_SUCCESS){
492
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
493
safer_gnutls_strerror(ret));
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
494
472
return -1;
495
473
}
496
474
503
481
}
504
482
505
483
/* OpenPGP credentials */
506
ret = gnutls_certificate_allocate_credentials(&mc->cred);
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
507
485
if(ret != GNUTLS_E_SUCCESS){
508
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
509
safer_gnutls_strerror(ret));
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
510
488
gnutls_global_deinit();
511
489
return -1;
512
490
}
513
491
514
492
if(debug){
515
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
516
" secret key %s as GnuTLS credentials\n",
517
pubkeyfilename,
518
seckeyfilename);
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
519
496
}
520
497
521
498
ret = gnutls_certificate_set_openpgp_key_file
522
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
523
500
GNUTLS_OPENPGP_FMT_BASE64);
524
501
if(ret != GNUTLS_E_SUCCESS){
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));
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));
530
507
goto globalfail;
531
508
}
532
509
533
510
/* GnuTLS server initialization */
534
ret = gnutls_dh_params_init(&mc->dh_params);
511
ret = gnutls_dh_params_init(&mc.dh_params);
535
512
if(ret != GNUTLS_E_SUCCESS){
536
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
537
" initialization: %s\n",
538
safer_gnutls_strerror(ret));
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
539
515
goto globalfail;
540
516
}
541
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
542
518
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
544
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
545
521
goto globalfail;
546
522
}
547
523
548
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
549
525
550
526
return 0;
551
527
552
528
globalfail:
553
529
554
gnutls_certificate_free_credentials(mc->cred);
530
gnutls_certificate_free_credentials(mc.cred);
555
531
gnutls_global_deinit();
556
gnutls_dh_params_deinit(mc->dh_params);
532
gnutls_dh_params_deinit(mc.dh_params);
557
533
return -1;
558
534
}
559
535
560
static int init_gnutls_session(gnutls_session_t *session,
561
mandos_context *mc){
536
static int init_gnutls_session(gnutls_session_t *session){
562
537
int ret;
563
538
/* GnuTLS session creation */
564
539
do {
568
543
}
569
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
545
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
574
548
}
575
549
576
550
{
577
551
const char *err;
578
552
do {
579
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
554
if(quit_now){
581
555
gnutls_deinit(*session);
582
556
return -1;
583
557
}
584
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
585
559
if(ret != GNUTLS_E_SUCCESS){
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
589
563
gnutls_deinit(*session);
590
564
return -1;
591
565
}
593
567
594
568
do {
595
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc->cred);
570
mc.cred);
597
571
if(quit_now){
598
572
gnutls_deinit(*session);
599
573
return -1;
600
574
}
601
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
576
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
605
579
gnutls_deinit(*session);
606
580
return -1;
607
581
}
609
583
/* ignore client certificate if any. */
610
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
585
612
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
587
614
588
return 0;
615
589
}
619
593
__attribute__((unused)) const char *txt){}
620
594
621
595
/* Called when a Mandos server is found */
622
static int start_mandos_communication(const char *ip, in_port_t port,
596
static int start_mandos_communication(const char *ip, uint16_t port,
623
597
AvahiIfIndex if_index,
624
int af, mandos_context *mc){
598
int af){
625
599
int ret, tcp_sd = -1;
626
600
ssize_t sret;
627
601
union {
652
626
pf = PF_INET;
653
627
break;
654
628
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
629
fprintf(stderr, "Bad address family: %d\n", af);
656
630
errno = EINVAL;
657
631
return -1;
658
632
}
659
633
660
ret = init_gnutls_session(&session, mc);
634
ret = init_gnutls_session(&session);
661
635
if(ret != 0){
662
636
return -1;
663
637
}
664
638
665
639
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIuMAX "\n", ip, (uintmax_t)port);
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
668
642
}
669
643
670
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
696
670
}
697
671
if(ret == 0){
698
672
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
673
fprintf(stderr, "Bad address: %s\n", ip);
700
674
errno = e;
701
675
goto mandos_end;
702
676
}
703
677
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
705
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
684
-Wunreachable-code*/
708
685
if(if_index == AVAHI_IF_UNSPEC){
709
fprintf_plus(stderr, "An IPv6 link-local address is"
710
" incomplete without a network interface\n");
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
711
688
errno = EINVAL;
712
689
goto mandos_end;
713
690
}
731
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
732
709
perror_plus("if_indextoname");
733
710
} else {
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
736
713
}
737
714
} else {
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
740
717
}
741
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
752
729
perror_plus("inet_ntop");
753
730
} else {
754
731
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
733
}
757
734
}
758
735
}
786
763
while(true){
787
764
size_t out_size = strlen(out);
788
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
789
out_size - written));
766
out_size - written));
790
767
if(ret == -1){
791
768
int e = errno;
792
769
perror_plus("write");
812
789
}
813
790
814
791
if(debug){
815
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
816
793
}
817
794
818
795
if(quit_now){
820
797
goto mandos_end;
821
798
}
822
799
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);
800
/* Spurious warning from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
828
802
829
803
if(quit_now){
830
804
errno = EINTR;
841
815
842
816
if(ret != GNUTLS_E_SUCCESS){
843
817
if(debug){
844
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
845
819
gnutls_perror(ret);
846
820
}
847
821
errno = EPROTO;
851
825
/* Read OpenPGP packet that contains the wanted password */
852
826
853
827
if(debug){
854
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
855
" %s\n", ip);
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
856
830
}
857
831
858
832
while(true){
863
837
}
864
838
865
839
buffer_capacity = incbuffer(&buffer, buffer_length,
866
buffer_capacity);
840
buffer_capacity);
867
841
if(buffer_capacity == 0){
868
842
int e = errno;
869
843
perror_plus("incbuffer");
896
870
}
897
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
898
872
if(ret < 0){
899
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
900
"***\n");
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
874
gnutls_perror(ret);
902
875
errno = EPROTO;
903
876
goto mandos_end;
904
877
}
905
878
break;
906
879
default:
907
fprintf_plus(stderr, "Unknown error while reading data from"
908
" encrypted session with Mandos server\n");
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
909
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
910
883
errno = EIO;
911
884
goto mandos_end;
916
889
}
917
890
918
891
if(debug){
919
fprintf_plus(stderr, "Closing TLS session\n");
892
fprintf(stderr, "Closing TLS session\n");
920
893
}
921
894
922
895
if(quit_now){
934
907
935
908
if(buffer_length > 0){
936
909
ssize_t decrypted_buffer_size;
937
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
938
&decrypted_buffer, mc);
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
939
913
if(decrypted_buffer_size >= 0){
940
914
941
915
written = 0;
951
925
if(ret == 0 and ferror(stdout)){
952
926
int e = errno;
953
927
if(debug){
954
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
955
strerror(errno));
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
956
930
}
957
931
errno = e;
958
932
goto mandos_end;
1002
976
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
977
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
978
flags,
1005
void* mc){
1006
if(r == NULL){
1007
return;
1008
}
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1009
981
1010
982
/* Called whenever a service has been resolved successfully or
1011
983
timed out */
1017
989
switch(event){
1018
990
default:
1019
991
case AVAHI_RESOLVER_FAILURE:
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)));
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)));
1025
995
break;
1026
996
1027
997
case AVAHI_RESOLVER_FOUND:
1029
999
char ip[AVAHI_ADDRESS_STR_MAX];
1030
1000
avahi_address_snprint(ip, sizeof(ip), address);
1031
1001
if(debug){
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);
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);
1035
1005
}
1036
int ret = start_mandos_communication(ip, (in_port_t)port,
1037
interface,
1038
avahi_proto_to_af(proto),
1039
mc);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1040
1008
if(ret == 0){
1041
avahi_simple_poll_quit(simple_poll);
1009
avahi_simple_poll_quit(mc.simple_poll);
1042
1010
} else {
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
}
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1049
1013
}
1050
1014
}
1051
1015
}
1061
1025
const char *domain,
1062
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1063
1027
flags,
1064
void* mc){
1065
if(b == NULL){
1066
return;
1067
}
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1068
1030
1069
1031
/* Called whenever a new services becomes available on the LAN or
1070
1032
is removed from the LAN */
1077
1039
default:
1078
1040
case AVAHI_BROWSER_FAILURE:
1079
1041
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);
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1084
1045
return;
1085
1046
1086
1047
case AVAHI_BROWSER_NEW:
1089
1050
the callback function is called the Avahi server will free the
1090
1051
resolver for us. */
1091
1052
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)));
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)));
1100
1058
break;
1101
1059
1102
1060
case AVAHI_BROWSER_REMOVE:
1105
1063
case AVAHI_BROWSER_ALL_FOR_NOW:
1106
1064
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1107
1065
if(debug){
1108
fprintf_plus(stderr, "No Mandos server found, still"
1109
" searching...\n");
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1110
1067
}
1111
1068
break;
1112
1069
}
1121
1078
signal_received = sig;
1122
1079
int old_errno = errno;
1123
1080
/* set main loop to exit */
1124
if(simple_poll != NULL){
1125
avahi_simple_poll_quit(simple_poll);
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1126
1083
}
1127
1084
errno = old_errno;
1128
1085
}
1129
1086
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){
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
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){
1144
1143
if(debug){
1145
ret_errno = errno;
1146
perror_plus("ioctl SIOCGIFFLAGS");
1147
errno = ret_errno;
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1148
1146
}
1149
return false;
1147
free(flagstring);
1148
return 0;
1150
1149
}
1151
return true;
1152
}
1153
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1156
1152
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1153
if(flags & IFF_LOOPBACK){
1158
1154
if(debug){
1159
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1160
ifname);
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1161
1157
}
1162
return false;
1158
return 0;
1163
1159
}
1164
1160
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1166
1162
if(debug){
1167
fprintf_plus(stderr, "Accepting point-to-point interface"
1168
" \"%s\"\n", ifname);
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1169
1165
}
1170
return true;
1166
return 1;
1171
1167
}
1172
1168
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1169
if(not (flags & IFF_BROADCAST)){
1174
1170
if(debug){
1175
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1176
" \"%s\"\n", ifname);
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1177
1173
}
1178
return false;
1174
return 0;
1179
1175
}
1180
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1177
if(flags & IFF_NOARP){
1182
1178
if(debug){
1183
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1184
ifname);
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1185
1181
}
1186
return false;
1182
return 0;
1187
1183
}
1188
1189
1184
/* Accept this device */
1190
1185
if(debug){
1191
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1192
}
1193
return true;
1194
}
1195
1196
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int good_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
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;
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1217
1188
}
1218
1189
return 1;
1219
1190
}
1220
1191
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
1253
1192
int notdotentries(const struct dirent *direntry){
1254
1193
/* Skip "." and ".." */
1255
1194
if(direntry->d_name[0] == '.'
1261
1200
return 1;
1262
1201
}
1263
1202
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){
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1327
1204
int ret;
1328
1205
struct timespec now;
1329
1206
struct timespec waited_time;
1330
1207
intmax_t block_time;
1331
1208
1332
1209
while(true){
1333
if(mc->current_server == NULL){
1210
if(mc.current_server == NULL){
1334
1211
if (debug){
1335
fprintf_plus(stderr, "Wait until first server is found."
1336
" No timeout!\n");
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1337
1214
}
1338
1215
ret = avahi_simple_poll_iterate(s, -1);
1339
1216
} else {
1340
1217
if (debug){
1341
fprintf_plus(stderr, "Check current_server if we should run"
1342
" it, or wait\n");
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1343
1220
}
1344
1221
/* the current time */
1345
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1350
1227
/* Calculating in ms how long time between now and server
1351
1228
who we visted longest time ago. Now - last seen. */
1352
1229
waited_time.tv_sec = (now.tv_sec
1353
- mc->current_server->last_seen.tv_sec);
1230
- mc.current_server->last_seen.tv_sec);
1354
1231
waited_time.tv_nsec = (now.tv_nsec
1355
- mc->current_server->last_seen.tv_nsec);
1232
- mc.current_server->last_seen.tv_nsec);
1356
1233
/* total time is 10s/10,000ms.
1357
1234
Converting to s from ms by dividing by 1,000,
1358
1235
and ns to ms by dividing by 1,000,000. */
1359
1236
block_time = ((retry_interval
1360
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1361
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
1239
1363
1240
if (debug){
1364
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1365
block_time);
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1366
1242
}
1367
1243
1368
1244
if(block_time <= 0){
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);
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);
1373
1249
if(ret == 0){
1374
avahi_simple_poll_quit(s);
1250
avahi_simple_poll_quit(mc.simple_poll);
1375
1251
return 0;
1376
1252
}
1377
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc->current_server->last_seen);
1254
&mc.current_server->last_seen);
1379
1255
if(ret == -1){
1380
1256
perror_plus("clock_gettime");
1381
1257
return -1;
1382
1258
}
1383
mc->current_server = mc->current_server->next;
1259
mc.current_server = mc.current_server->next;
1384
1260
block_time = 0; /* Call avahi to find new Mandos
1385
1261
servers, but don't block */
1386
1262
}
1388
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1389
1265
}
1390
1266
if(ret != 0){
1391
if (ret > 0 or errno != EINTR){
1267
if (ret > 0 or errno != EINTR) {
1392
1268
return (ret != 1) ? ret : 0;
1393
1269
}
1394
1270
}
1395
1271
}
1396
1272
}
1397
1273
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
1755
1274
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 };
1759
1275
AvahiSServiceBrowser *sb = NULL;
1760
error_t ret_errno;
1276
int error;
1761
1277
int ret;
1762
1278
intmax_t tmpmax;
1763
1279
char *tmp;
1764
1280
int exitcode = EXIT_SUCCESS;
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;
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;
1769
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1770
1288
bool tempdir_created = false;
1771
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1772
1290
const char *seckey = PATHDIR "/" SECKEY;
1773
1291
const char *pubkey = PATHDIR "/" PUBKEY;
1774
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1776
1292
1777
1293
bool gnutls_initialized = false;
1778
1294
bool gpgme_initialized = false;
1840
1356
.group = 2 },
1841
1357
{ .name = "retry", .key = 132,
1842
1358
.arg = "SECONDS",
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",
1359
.doc = "Retry interval used when denied by the mandos server",
1848
1360
.group = 2 },
1849
1361
/*
1850
1362
* These reproduce what we would get without ARGP_NO_HELP
1869
1381
connect_to = arg;
1870
1382
break;
1871
1383
case 'i': /* --interface */
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
}
1384
interface = arg;
1877
1385
break;
1878
1386
case 's': /* --seckey */
1879
1387
seckey = arg;
1903
1411
errno = 0;
1904
1412
retry_interval = strtod(arg, &tmp);
1905
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
1906
or (retry_interval * 1000) > INT_MAX
1907
or retry_interval < 0){
1414
or (retry_interval * 1000) > INT_MAX){
1908
1415
argp_error(state, "Bad retry interval");
1909
1416
}
1910
1417
break;
1911
case 133: /* --network-hook-dir */
1912
hookdir = arg;
1913
break;
1914
1418
/*
1915
1419
* These reproduce what we would get without ARGP_NO_HELP
1916
1420
*/
1922
1426
argp_state_help(state, state->out_stream,
1923
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1924
1428
case 'V': /* --version */
1925
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1926
1430
exit(argp_err_exit_status);
1927
1431
break;
1928
1432
default:
1955
1459
{
1956
1460
/* Work around Debian bug #633582:
1957
1461
<http://bugs.debian.org/633582> */
1462
struct stat st;
1958
1463
1959
1464
/* 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;
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
2047
1512
}
2048
1513
}
2049
1514
2050
1515
if(not debug){
2051
1516
avahi_set_log_function(empty_log);
2052
1517
}
1518
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1522
alphasort);
1523
if(ret >= 1){
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1526
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
}
1529
if(interface == NULL){
1530
perror_plus("malloc");
1531
free(direntries);
1532
exitcode = EXIT_FAILURE;
1533
goto end;
1534
}
1535
free(direntries);
1536
} else {
1537
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1539
exitcode = EXIT_FAILURE;
1540
goto end;
1541
}
1542
}
2053
1543
2054
1544
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2055
1545
from the signal handler */
2056
1546
/* Initialize the pseudo-RNG for Avahi */
2057
1547
srand((unsigned int) time(NULL));
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");
1548
mc.simple_poll = avahi_simple_poll_new();
1549
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2062
1551
exitcode = EX_UNAVAILABLE;
2063
1552
goto end;
2064
1553
}
2126
1615
}
2127
1616
}
2128
1617
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);
1618
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1624
goto end;
1625
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
/* Re-raise priviliges */
1632
errno = 0;
1633
ret = seteuid(0);
1634
if(ret == -1){
1635
perror_plus("seteuid");
1636
}
1637
1638
#ifdef __linux__
1639
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
1641
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
1643
if(ret == -1){
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
1646
}
1647
#endif /* __linux__ */
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1653
#ifdef __linux__
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1656
if(ret == -1){
1657
perror_plus("klogctl");
1658
}
1659
}
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1662
errno = 0;
1663
ret = seteuid(uid);
1664
if(ret == -1){
1665
perror_plus("seteuid");
1666
}
1667
goto end;
1668
}
1669
strcpy(network.ifr_name, interface);
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1671
if(ret == -1){
1672
perror_plus("ioctl SIOCGIFFLAGS");
1673
#ifdef __linux__
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1676
if(ret == -1){
1677
perror_plus("klogctl");
1678
}
1679
}
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1683
errno = 0;
1684
ret = seteuid(uid);
1685
if(ret == -1){
1686
perror_plus("seteuid");
1687
}
1688
goto end;
1689
}
1690
if((network.ifr_flags & IFF_UP) == 0){
1691
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1694
if(ret == -1){
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1698
#ifdef __linux__
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1701
if(ret == -1){
1702
perror_plus("klogctl");
1703
}
1704
}
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1707
errno = 0;
1708
ret = seteuid(uid);
1709
if(ret == -1){
1710
perror_plus("seteuid");
1711
}
1712
goto end;
1713
}
1714
}
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1719
if(ret == -1){
1720
perror_plus("ioctl SIOCGIFFLAGS");
1721
} else if(network.ifr_flags & IFF_RUNNING){
1722
break;
1723
}
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
ret = nanosleep(&sleeptime, NULL);
1726
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1728
}
1729
}
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
if(ret == -1){
1734
perror_plus("close");
1735
}
1736
}
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1741
if(ret == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1747
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
2150
1754
} else {
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
}
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
2184
1759
}
2185
1760
}
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
}
2192
1761
}
2193
1762
2194
1763
if(quit_now){
2195
1764
goto end;
2196
1765
}
2197
1766
2198
ret = init_gnutls_global(pubkey, seckey, &mc);
1767
ret = init_gnutls_global(pubkey, seckey);
2199
1768
if(ret == -1){
2200
fprintf_plus(stderr, "init_gnutls_global failed\n");
1769
fprintf(stderr, "init_gnutls_global failed\n");
2201
1770
exitcode = EX_UNAVAILABLE;
2202
1771
goto end;
2203
1772
} else {
2218
1787
goto end;
2219
1788
}
2220
1789
2221
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2222
fprintf_plus(stderr, "init_gpgme failed\n");
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2223
1792
exitcode = EX_UNAVAILABLE;
2224
1793
goto end;
2225
1794
} else {
2234
1803
/* Connect directly, do not use Zeroconf */
2235
1804
/* (Mainly meant for debugging) */
2236
1805
char *address = strrchr(connect_to, ':');
2237
2238
1806
if(address == NULL){
2239
fprintf_plus(stderr, "No colon in address\n");
1807
fprintf(stderr, "No colon in address\n");
2240
1808
exitcode = EX_USAGE;
2241
1809
goto end;
2242
1810
}
2245
1813
goto end;
2246
1814
}
2247
1815
2248
in_port_t port;
1816
uint16_t port;
2249
1817
errno = 0;
2250
1818
tmpmax = strtoimax(address+1, &tmp, 10);
2251
1819
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2252
or tmpmax != (in_port_t)tmpmax){
2253
fprintf_plus(stderr, "Bad port number\n");
1820
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2254
1822
exitcode = EX_USAGE;
2255
1823
goto end;
2256
1824
}
2259
1827
goto end;
2260
1828
}
2261
1829
2262
port = (in_port_t)tmpmax;
1830
port = (uint16_t)tmpmax;
2263
1831
*address = '\0';
1832
address = connect_to;
2264
1833
/* Colon in address indicates IPv6 */
2265
1834
int af;
2266
if(strchr(connect_to, ':') != NULL){
1835
if(strchr(address, ':') != NULL){
2267
1836
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
}
2274
1837
} else {
2275
1838
af = AF_INET;
2276
1839
}
2277
address = connect_to;
2278
1840
2279
1841
if(quit_now){
2280
1842
goto end;
2281
1843
}
2282
1844
2283
1845
while(not quit_now){
2284
ret = start_mandos_communication(address, port, if_index, af,
2285
&mc);
1846
ret = start_mandos_communication(address, port, if_index, af);
2286
1847
if(quit_now or ret == 0){
2287
1848
break;
2288
1849
}
2289
if(debug){
2290
fprintf_plus(stderr, "Retrying in %d seconds\n",
2291
(int)retry_interval);
2292
}
2293
sleep((int)retry_interval);
2294
}
2295
1850
sleep((int)retry_interval or 1);
1851
};
1852
2296
1853
if (not quit_now){
2297
1854
exitcode = EXIT_SUCCESS;
2298
1855
}
2299
1856
2300
1857
goto end;
2301
1858
}
2302
1859
2314
1871
config.publish_domain = 0;
2315
1872
2316
1873
/* Allocate a new server */
2317
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2318
&config, NULL, NULL, &ret_errno);
1874
mc.server = avahi_server_new(avahi_simple_poll_get
1875
(mc.simple_poll), &config, NULL,
1876
NULL, &error);
2319
1877
2320
1878
/* Free the Avahi configuration data */
2321
1879
avahi_server_config_free(&config);
2323
1881
2324
1882
/* Check if creating the Avahi server object succeeded */
2325
1883
if(mc.server == NULL){
2326
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2327
avahi_strerror(ret_errno));
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2328
1886
exitcode = EX_UNAVAILABLE;
2329
1887
goto end;
2330
1888
}
2336
1894
/* Create the Avahi service browser */
2337
1895
sb = avahi_s_service_browser_new(mc.server, if_index,
2338
1896
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2339
NULL, 0, browse_callback,
2340
(void *)&mc);
1897
NULL, 0, browse_callback, NULL);
2341
1898
if(sb == NULL){
2342
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2343
avahi_strerror(avahi_server_errno(mc.server)));
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2344
1901
exitcode = EX_UNAVAILABLE;
2345
1902
goto end;
2346
1903
}
2352
1909
/* Run the main loop */
2353
1910
2354
1911
if(debug){
2355
fprintf_plus(stderr, "Starting Avahi loop search\n");
1912
fprintf(stderr, "Starting Avahi loop search\n");
2356
1913
}
2357
1914
2358
ret = avahi_loop_with_timeout(simple_poll,
2359
(int)(retry_interval * 1000), &mc);
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
2360
1917
if(debug){
2361
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2362
(ret == 0) ? "successfully" : "with error");
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2363
1920
}
2364
1921
2365
1922
end:
2366
1923
2367
1924
if(debug){
2368
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2369
1926
}
2370
1927
2371
1928
/* Cleanup things */
2375
1932
if(mc.server != NULL)
2376
1933
avahi_server_free(mc.server);
2377
1934
2378
if(simple_poll != NULL)
2379
avahi_simple_poll_free(simple_poll);
1935
if(mc.simple_poll != NULL)
1936
avahi_simple_poll_free(mc.simple_poll);
2380
1937
2381
1938
if(gnutls_initialized){
2382
1939
gnutls_certificate_free_credentials(mc.cred);
2387
1944
if(gpgme_initialized){
2388
1945
gpgme_release(mc.ctx);
2389
1946
}
2390
1947
2391
1948
/* Cleans up the circular linked list of Mandos servers the client
2392
1949
has seen */
2393
1950
if(mc.current_server != NULL){
2399
1956
}
2400
1957
}
2401
1958
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");
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1962
errno = 0;
1963
ret = seteuid(0);
1964
if(ret == -1){
1965
perror_plus("seteuid");
1966
}
1967
if(geteuid() == 0){
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2420
1976
}
2421
1977
}
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2424
" down\n");
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
2425
1987
}
2426
1988
}
2427
2428
lower_privileges_permanently();
2429
1989
}
2430
1990
2431
free(interfaces_to_take_down);
2432
free(interfaces_hooks);
2433
2434
1991
/* Removes the GPGME temp directory and all files inside */
2435
1992
if(tempdir_created){
2436
1993
struct dirent **direntries = NULL;
2437
1994
struct dirent *direntry = NULL;
2438
int numentries = scandir(tempdir, &direntries, notdotentries,
2439
alphasort);
2440
if (numentries > 0){
2441
for(int i = 0; i < numentries; i++){
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
2442
1998
direntry = direntries[i];
2443
1999
char *fullname = NULL;
2444
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
2449
2005
}
2450
2006
ret = remove(fullname);
2451
2007
if(ret == -1){
2452
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2453
strerror(errno));
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2454
2010
}
2455
2011
free(fullname);
2456
2012
}
2457
2013
}
2458
2014
2459
/* need to clean even if 0 because man page doesn't specify */
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2460
2017
free(direntries);
2461
if (numentries == -1){
2018
if (ret == -1){
2462
2019
perror_plus("scandir");
2463
2020
}
2464
2021
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0