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- Committer: Teddy Hogeborn
- Date: 2009-02-23 11:52:42 UTC
- Revision ID: teddy@fukt.bsnet.se-20090223115242-5930ewin7m4o6zpr
* README (The Plugin System): Improve wording.
- files removed:
- DBUS-API
- debian/source
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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() */
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
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() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
72
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
81
80
argp_parse(), ARGP_KEY_ARG,
82
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
90
85
91
86
#ifdef __linux__
92
87
#include <sys/klog.h> /* klogctl() */
110
105
init_gnutls_session(),
111
106
GNUTLS_* */
112
107
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
115
110
116
111
/* GPGME */
117
112
#include <gpgme.h> /* All GPGME types, constants and
125
120
#define PATHDIR "/conf/conf.d/mandos"
126
121
#define SECKEY "seckey.txt"
127
122
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
123
130
124
bool debug = false;
131
125
static const char mandos_protocol_version[] = "1";
132
126
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
128
149
129
/* Used for passing in values through the Avahi callback functions */
150
130
typedef struct {
155
135
gnutls_dh_params_t dh_params;
156
136
const char *priority;
157
137
gpgme_ctx_t ctx;
158
server *current_server;
159
138
} mandos_context;
160
139
161
140
/* global context so signal handler can reach it*/
162
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
142
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
166
167
sig_atomic_t quit_now = 0;
168
int signal_received = 0;
169
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
177
int fprintf_plus(FILE *stream, const char *format, ...){
178
va_list ap;
179
va_start (ap, format);
180
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
185
144
186
145
/*
187
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
189
148
* "buffer_length" is how much is already used.
190
149
*/
191
150
size_t incbuffer(char **buffer, size_t buffer_length,
192
size_t buffer_capacity){
151
size_t buffer_capacity){
193
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
194
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
154
if(buffer == NULL){
200
159
return buffer_capacity;
201
160
}
202
161
203
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
206
int ret;
207
server *new_server = malloc(sizeof(server));
208
if(new_server == NULL){
209
perror_plus("malloc");
210
return -1;
211
}
212
*new_server = (server){ .ip = strdup(ip),
213
.port = port,
214
.if_index = if_index,
215
.af = af };
216
if(new_server->ip == NULL){
217
perror_plus("strdup");
218
return -1;
219
}
220
/* Special case of first server */
221
if (mc.current_server == NULL){
222
new_server->next = new_server;
223
new_server->prev = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
226
} else {
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
229
new_server->prev->next = new_server;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
238
}
239
240
162
/*
241
163
* Initialize GPGME.
242
164
*/
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
245
168
gpgme_error_t rc;
246
169
gpgme_engine_info_t engine_info;
247
170
250
173
* Helper function to insert pub and seckey to the engine keyring.
251
174
*/
252
175
bool import_key(const char *filename){
253
int ret;
254
176
int fd;
255
177
gpgme_data_t pgp_data;
256
178
257
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
258
180
if(fd == -1){
259
perror_plus("open");
181
perror("open");
260
182
return false;
261
183
}
262
184
263
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
264
186
if(rc != GPG_ERR_NO_ERROR){
265
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
267
189
return false;
268
190
}
269
191
270
192
rc = gpgme_op_import(mc.ctx, pgp_data);
271
193
if(rc != GPG_ERR_NO_ERROR){
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
274
196
return false;
275
197
}
276
198
277
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
278
200
if(ret == -1){
279
perror_plus("close");
201
perror("close");
280
202
}
281
203
gpgme_data_release(pgp_data);
282
204
return true;
283
205
}
284
206
285
207
if(debug){
286
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
287
209
}
288
210
289
211
/* Init GPGME */
290
212
gpgme_check_version(NULL);
291
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
292
214
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
295
217
return false;
296
218
}
297
219
298
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
299
221
rc = gpgme_get_engine_info(&engine_info);
300
222
if(rc != GPG_ERR_NO_ERROR){
301
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
303
225
return false;
304
226
}
305
227
while(engine_info != NULL){
311
233
engine_info = engine_info->next;
312
234
}
313
235
if(engine_info == NULL){
314
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
315
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
316
237
return false;
317
238
}
318
239
319
240
/* Create new GPGME "context" */
320
241
rc = gpgme_new(&(mc.ctx));
321
242
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
324
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
325
245
return false;
326
246
}
327
247
329
249
return false;
330
250
}
331
251
332
return true;
252
return true;
333
253
}
334
254
335
255
/*
346
266
ssize_t plaintext_length = 0;
347
267
348
268
if(debug){
349
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
350
270
}
351
271
352
272
/* Create new GPGME data buffer from memory cryptotext */
353
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
354
274
0);
355
275
if(rc != GPG_ERR_NO_ERROR){
356
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
358
278
return -1;
359
279
}
360
280
361
281
/* Create new empty GPGME data buffer for the plaintext */
362
282
rc = gpgme_data_new(&dh_plain);
363
283
if(rc != GPG_ERR_NO_ERROR){
364
fprintf_plus(stderr, "Mandos plugin mandos-client: "
365
"bad gpgme_data_new: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
367
286
gpgme_data_release(dh_crypto);
368
287
return -1;
369
288
}
372
291
data buffer */
373
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
374
293
if(rc != GPG_ERR_NO_ERROR){
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
377
296
plaintext_length = -1;
378
297
if(debug){
379
298
gpgme_decrypt_result_t result;
380
299
result = gpgme_op_decrypt_result(mc.ctx);
381
300
if(result == NULL){
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
302
} else {
384
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
385
result->unsupported_algorithm);
386
fprintf_plus(stderr, "Wrong key usage: %u\n",
387
result->wrong_key_usage);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
388
307
if(result->file_name != NULL){
389
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
390
309
}
391
310
gpgme_recipient_t recipient;
392
311
recipient = result->recipients;
393
while(recipient != NULL){
394
fprintf_plus(stderr, "Public key algorithm: %s\n",
395
gpgme_pubkey_algo_name
396
(recipient->pubkey_algo));
397
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
398
fprintf_plus(stderr, "Secret key available: %s\n",
399
recipient->status == GPG_ERR_NO_SECKEY
400
? "No" : "Yes");
401
recipient = recipient->next;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
402
322
}
403
323
}
404
324
}
406
326
}
407
327
408
328
if(debug){
409
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
410
330
}
411
331
412
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
413
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
414
perror_plus("gpgme_data_seek");
334
perror("gpgme_data_seek");
415
335
plaintext_length = -1;
416
336
goto decrypt_end;
417
337
}
419
339
*plaintext = NULL;
420
340
while(true){
421
341
plaintext_capacity = incbuffer(plaintext,
422
(size_t)plaintext_length,
423
plaintext_capacity);
342
(size_t)plaintext_length,
343
plaintext_capacity);
424
344
if(plaintext_capacity == 0){
425
perror_plus("incbuffer");
426
plaintext_length = -1;
427
goto decrypt_end;
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
428
348
}
429
349
430
350
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
435
355
break;
436
356
}
437
357
if(ret < 0){
438
perror_plus("gpgme_data_read");
358
perror("gpgme_data_read");
439
359
plaintext_length = -1;
440
360
goto decrypt_end;
441
361
}
443
363
}
444
364
445
365
if(debug){
446
fprintf_plus(stderr, "Decrypted password is: ");
366
fprintf(stderr, "Decrypted password is: ");
447
367
for(ssize_t i = 0; i < plaintext_length; i++){
448
368
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
449
369
}
471
391
/* GnuTLS log function callback */
472
392
static void debuggnutls(__attribute__((unused)) int level,
473
393
const char* string){
474
fprintf_plus(stderr, "GnuTLS: %s", string);
394
fprintf(stderr, "GnuTLS: %s", string);
475
395
}
476
396
477
397
static int init_gnutls_global(const char *pubkeyfilename,
479
399
int ret;
480
400
481
401
if(debug){
482
fprintf_plus(stderr, "Initializing GnuTLS\n");
402
fprintf(stderr, "Initializing GnuTLS\n");
483
403
}
484
404
485
405
ret = gnutls_global_init();
486
406
if(ret != GNUTLS_E_SUCCESS){
487
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
488
safer_gnutls_strerror(ret));
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
489
409
return -1;
490
410
}
491
411
498
418
}
499
419
500
420
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
421
gnutls_certificate_allocate_credentials(&mc.cred);
502
422
if(ret != GNUTLS_E_SUCCESS){
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
safer_gnutls_strerror(ret));
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
505
428
gnutls_global_deinit();
506
429
return -1;
507
430
}
508
431
509
432
if(debug){
510
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
511
" secret key %s as GnuTLS credentials\n",
512
pubkeyfilename,
513
seckeyfilename);
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
514
436
}
515
437
516
438
ret = gnutls_certificate_set_openpgp_key_file
517
439
(mc.cred, pubkeyfilename, seckeyfilename,
518
440
GNUTLS_OPENPGP_FMT_BASE64);
519
441
if(ret != GNUTLS_E_SUCCESS){
520
fprintf_plus(stderr,
521
"Error[%d] while reading the OpenPGP key pair ('%s',"
522
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
523
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
524
safer_gnutls_strerror(ret));
442
fprintf(stderr,
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
525
447
goto globalfail;
526
448
}
527
449
528
450
/* GnuTLS server initialization */
529
451
ret = gnutls_dh_params_init(&mc.dh_params);
530
452
if(ret != GNUTLS_E_SUCCESS){
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
" initialization: %s\n",
533
safer_gnutls_strerror(ret));
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
534
455
goto globalfail;
535
456
}
536
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
537
458
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
540
461
goto globalfail;
541
462
}
542
463
555
476
static int init_gnutls_session(gnutls_session_t *session){
556
477
int ret;
557
478
/* GnuTLS session creation */
558
do {
559
ret = gnutls_init(session, GNUTLS_SERVER);
560
if(quit_now){
561
return -1;
562
}
563
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
479
ret = gnutls_init(session, GNUTLS_SERVER);
564
480
if(ret != GNUTLS_E_SUCCESS){
565
fprintf_plus(stderr,
566
"Error in GnuTLS session initialization: %s\n",
567
safer_gnutls_strerror(ret));
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
568
483
}
569
484
570
485
{
571
486
const char *err;
572
do {
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
574
if(quit_now){
575
gnutls_deinit(*session);
576
return -1;
577
}
578
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
579
488
if(ret != GNUTLS_E_SUCCESS){
580
fprintf_plus(stderr, "Syntax error at: %s\n", err);
581
fprintf_plus(stderr, "GnuTLS error: %s\n",
582
safer_gnutls_strerror(ret));
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
583
492
gnutls_deinit(*session);
584
493
return -1;
585
494
}
586
495
}
587
496
588
do {
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
590
mc.cred);
591
if(quit_now){
592
gnutls_deinit(*session);
593
return -1;
594
}
595
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
596
499
if(ret != GNUTLS_E_SUCCESS){
597
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
598
safer_gnutls_strerror(ret));
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
safer_gnutls_strerror(ret));
599
502
gnutls_deinit(*session);
600
503
return -1;
601
504
}
602
505
603
506
/* ignore client certificate if any. */
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
605
509
606
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
607
511
616
520
static int start_mandos_communication(const char *ip, uint16_t port,
617
521
AvahiIfIndex if_index,
618
522
int af){
619
int ret, tcp_sd = -1;
523
int ret, tcp_sd;
620
524
ssize_t sret;
621
525
union {
622
526
struct sockaddr_in in;
623
527
struct sockaddr_in6 in6;
624
528
} to;
625
529
char *buffer = NULL;
626
char *decrypted_buffer = NULL;
530
char *decrypted_buffer;
627
531
size_t buffer_length = 0;
628
532
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
629
534
size_t written;
630
int retval = -1;
535
int retval = 0;
631
536
gnutls_session_t session;
632
537
int pf; /* Protocol family */
633
538
634
errno = 0;
635
636
if(quit_now){
637
errno = EINTR;
638
return -1;
639
}
640
641
539
switch(af){
642
540
case AF_INET6:
643
541
pf = PF_INET6;
646
544
pf = PF_INET;
647
545
break;
648
546
default:
649
fprintf_plus(stderr, "Bad address family: %d\n", af);
650
errno = EINVAL;
547
fprintf(stderr, "Bad address family: %d\n", af);
651
548
return -1;
652
549
}
653
550
657
554
}
658
555
659
556
if(debug){
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
662
559
}
663
560
664
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
665
562
if(tcp_sd < 0){
666
int e = errno;
667
perror_plus("socket");
668
errno = e;
669
goto mandos_end;
670
}
671
672
if(quit_now){
673
errno = EINTR;
674
goto mandos_end;
563
perror("socket");
564
return -1;
675
565
}
676
566
677
567
memset(&to, 0, sizeof(to));
678
568
if(af == AF_INET6){
679
to.in6.sin6_family = (sa_family_t)af;
569
to.in6.sin6_family = (uint16_t)af;
680
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
681
571
} else { /* IPv4 */
682
572
to.in.sin_family = (sa_family_t)af;
683
573
ret = inet_pton(af, ip, &to.in.sin_addr);
684
574
}
685
575
if(ret < 0 ){
686
int e = errno;
687
perror_plus("inet_pton");
688
errno = e;
689
goto mandos_end;
576
perror("inet_pton");
577
return -1;
690
578
}
691
579
if(ret == 0){
692
int e = errno;
693
fprintf_plus(stderr, "Bad address: %s\n", ip);
694
errno = e;
695
goto mandos_end;
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
696
582
}
697
583
if(af == AF_INET6){
698
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
587
702
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
590
-Wunreachable-code*/
705
591
if(if_index == AVAHI_IF_UNSPEC){
706
fprintf_plus(stderr, "An IPv6 link-local address is"
707
" incomplete without a network interface\n");
708
errno = EINVAL;
709
goto mandos_end;
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
710
595
}
711
596
/* Set the network interface number as scope */
712
597
to.in6.sin6_scope_id = (uint32_t)if_index;
717
602
-Wunreachable-code */
718
603
}
719
604
720
if(quit_now){
721
errno = EINTR;
722
goto mandos_end;
723
}
724
725
605
if(debug){
726
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
727
607
char interface[IF_NAMESIZE];
728
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
perror_plus("if_indextoname");
609
perror("if_indextoname");
730
610
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
733
613
}
734
614
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
737
617
}
738
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
626
sizeof(addrstr));
747
627
}
748
628
if(pcret == NULL){
749
perror_plus("inet_ntop");
629
perror("inet_ntop");
750
630
} else {
751
631
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
753
633
}
754
634
}
755
635
}
756
636
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
760
}
761
762
637
if(af == AF_INET6){
763
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
764
639
} else {
765
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
766
641
}
767
642
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
int e = errno;
770
perror_plus("connect");
771
errno = e;
772
}
773
goto mandos_end;
774
}
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
643
perror("connect");
644
return -1;
779
645
}
780
646
781
647
const char *out = mandos_protocol_version;
783
649
while(true){
784
650
size_t out_size = strlen(out);
785
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
786
out_size - written));
652
out_size - written));
787
653
if(ret == -1){
788
int e = errno;
789
perror_plus("write");
790
errno = e;
654
perror("write");
655
retval = -1;
791
656
goto mandos_end;
792
657
}
793
658
written += (size_t)ret;
801
666
break;
802
667
}
803
668
}
804
805
if(quit_now){
806
errno = EINTR;
807
goto mandos_end;
808
}
809
669
}
810
670
811
671
if(debug){
812
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
813
}
814
815
if(quit_now){
816
errno = EINTR;
817
goto mandos_end;
818
}
819
820
/* Spurious warning from -Wint-to-pointer-cast */
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
821
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
822
676
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
827
828
do {
677
do{
829
678
ret = gnutls_handshake(session);
830
if(quit_now){
831
errno = EINTR;
832
goto mandos_end;
833
}
834
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
835
680
836
681
if(ret != GNUTLS_E_SUCCESS){
837
682
if(debug){
838
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
839
684
gnutls_perror(ret);
840
685
}
841
errno = EPROTO;
686
retval = -1;
842
687
goto mandos_end;
843
688
}
844
689
845
690
/* Read OpenPGP packet that contains the wanted password */
846
691
847
692
if(debug){
848
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
849
" %s\n", ip);
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
850
695
}
851
696
852
697
while(true){
853
854
if(quit_now){
855
errno = EINTR;
856
goto mandos_end;
857
}
858
859
698
buffer_capacity = incbuffer(&buffer, buffer_length,
860
buffer_capacity);
699
buffer_capacity);
861
700
if(buffer_capacity == 0){
862
int e = errno;
863
perror_plus("incbuffer");
864
errno = e;
865
goto mandos_end;
866
}
867
868
if(quit_now){
869
errno = EINTR;
701
perror("incbuffer");
702
retval = -1;
870
703
goto mandos_end;
871
704
}
872
705
881
714
case GNUTLS_E_AGAIN:
882
715
break;
883
716
case GNUTLS_E_REHANDSHAKE:
884
do {
717
do{
885
718
ret = gnutls_handshake(session);
886
887
if(quit_now){
888
errno = EINTR;
889
goto mandos_end;
890
}
891
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
892
720
if(ret < 0){
893
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
894
"***\n");
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
895
722
gnutls_perror(ret);
896
errno = EPROTO;
723
retval = -1;
897
724
goto mandos_end;
898
725
}
899
726
break;
900
727
default:
901
fprintf_plus(stderr, "Unknown error while reading data from"
902
" encrypted session with Mandos server\n");
728
fprintf(stderr, "Unknown error while reading data from"
729
" encrypted session with Mandos server\n");
730
retval = -1;
903
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
904
errno = EIO;
905
732
goto mandos_end;
906
733
}
907
734
} else {
910
737
}
911
738
912
739
if(debug){
913
fprintf_plus(stderr, "Closing TLS session\n");
914
}
915
916
if(quit_now){
917
errno = EINTR;
918
goto mandos_end;
919
}
920
921
do {
922
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
923
if(quit_now){
924
errno = EINTR;
925
goto mandos_end;
926
}
927
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
928
744
929
745
if(buffer_length > 0){
930
ssize_t decrypted_buffer_size;
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
932
748
&decrypted_buffer);
933
749
if(decrypted_buffer_size >= 0){
934
935
750
written = 0;
936
751
while(written < (size_t) decrypted_buffer_size){
937
if(quit_now){
938
errno = EINTR;
939
goto mandos_end;
940
}
941
942
752
ret = (int)fwrite(decrypted_buffer + written, 1,
943
753
(size_t)decrypted_buffer_size - written,
944
754
stdout);
945
755
if(ret == 0 and ferror(stdout)){
946
int e = errno;
947
756
if(debug){
948
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
949
strerror(errno));
757
fprintf(stderr, "Error writing encrypted data: %s\n",
758
strerror(errno));
950
759
}
951
errno = e;
952
goto mandos_end;
760
retval = -1;
761
break;
953
762
}
954
763
written += (size_t)ret;
955
764
}
956
retval = 0;
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
957
768
}
769
} else {
770
retval = -1;
958
771
}
959
772
960
773
/* Shutdown procedure */
961
774
962
775
mandos_end:
963
{
964
int e = errno;
965
free(decrypted_buffer);
966
free(buffer);
967
if(tcp_sd >= 0){
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
969
}
970
if(ret == -1){
971
if(e == 0){
972
e = errno;
973
}
974
perror_plus("close");
975
}
976
gnutls_deinit(session);
977
errno = e;
978
if(quit_now){
979
errno = EINTR;
980
retval = -1;
981
}
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
982
780
}
781
gnutls_deinit(session);
983
782
return retval;
984
783
}
985
784
1002
801
/* Called whenever a service has been resolved successfully or
1003
802
timed out */
1004
803
1005
if(quit_now){
1006
return;
1007
}
1008
1009
804
switch(event){
1010
805
default:
1011
806
case AVAHI_RESOLVER_FAILURE:
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
avahi_strerror(avahi_server_errno(mc.server)));
1016
810
break;
1017
811
1018
812
case AVAHI_RESOLVER_FOUND:
1020
814
char ip[AVAHI_ADDRESS_STR_MAX];
1021
815
avahi_address_snprint(ip, sizeof(ip), address);
1022
816
if(debug){
1023
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
host_name, ip, (intmax_t)interface, port);
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
1026
820
}
1027
821
int ret = start_mandos_communication(ip, port, interface,
1028
822
avahi_proto_to_af(proto));
1029
823
if(ret == 0){
1030
824
avahi_simple_poll_quit(mc.simple_poll);
1031
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1034
825
}
1035
826
}
1036
827
}
1052
843
/* Called whenever a new services becomes available on the LAN or
1053
844
is removed from the LAN */
1054
845
1055
if(quit_now){
1056
return;
1057
}
1058
1059
846
switch(event){
1060
847
default:
1061
848
case AVAHI_BROWSER_FAILURE:
1062
849
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
850
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
1065
852
avahi_simple_poll_quit(mc.simple_poll);
1066
853
return;
1067
854
1074
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
862
name, type, domain, protocol, 0,
1076
863
resolve_callback, NULL) == NULL)
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
name, avahi_strerror(avahi_server_errno(mc.server)));
1080
866
break;
1081
867
1082
868
case AVAHI_BROWSER_REMOVE:
1085
871
case AVAHI_BROWSER_ALL_FOR_NOW:
1086
872
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1087
873
if(debug){
1088
fprintf_plus(stderr, "No Mandos server found, still"
1089
" searching...\n");
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1090
875
}
1091
876
break;
1092
877
}
1093
878
}
1094
879
1095
/* Signal handler that stops main loop after SIGTERM */
1096
static void handle_sigterm(int sig){
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1097
884
if(quit_now){
1098
885
return;
1099
886
}
1100
887
quit_now = 1;
1101
signal_received = sig;
1102
888
int old_errno = errno;
1103
/* set main loop to exit */
1104
889
if(mc.simple_poll != NULL){
1105
890
avahi_simple_poll_quit(mc.simple_poll);
1106
891
}
1107
892
errno = old_errno;
1108
893
}
1109
894
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
int ret;
1112
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
if(s < 0){
1115
perror_plus("socket");
1116
return false;
1117
}
1118
strcpy(ifr->ifr_name, ifname);
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
if(ret == -1){
1121
if(debug){
1122
perror_plus("ioctl SIOCGIFFLAGS");
1123
}
1124
return false;
1125
}
1126
return true;
1127
}
1128
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1131
/* Reject the loopback device */
1132
if(ifr->ifr_flags & IFF_LOOPBACK){
1133
if(debug){
1134
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1135
ifname);
1136
}
1137
return false;
1138
}
1139
/* Accept point-to-point devices only if connect_to is specified */
1140
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1141
if(debug){
1142
fprintf_plus(stderr, "Accepting point-to-point interface"
1143
" \"%s\"\n", ifname);
1144
}
1145
return true;
1146
}
1147
/* Otherwise, reject non-broadcast-capable devices */
1148
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1149
if(debug){
1150
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1151
" \"%s\"\n", ifname);
1152
}
1153
return false;
1154
}
1155
/* Reject non-ARP interfaces (including dummy interfaces) */
1156
if(ifr->ifr_flags & IFF_NOARP){
1157
if(debug){
1158
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1159
ifname);
1160
}
1161
return false;
1162
}
1163
1164
/* Accept this device */
1165
if(debug){
1166
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1167
}
1168
return true;
1169
}
1170
1171
/*
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int good_interface(const struct dirent *if_entry){
1177
if(if_entry->d_name[0] == '.'){
1178
return 0;
1179
}
1180
1181
struct ifreq ifr;
1182
if(not get_flags(if_entry->d_name, &ifr)){
1183
if(debug){
1184
fprintf_plus(stderr, "Failed to get flags for interface "
1185
"\"%s\"\n", if_entry->d_name);
1186
}
1187
return 0;
1188
}
1189
1190
if(not good_flags(if_entry->d_name, &ifr)){
1191
return 0;
1192
}
1193
return 1;
1194
}
1195
1196
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_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
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1239
int notdotentries(const struct dirent *direntry){
1240
/* Skip "." and ".." */
1241
if(direntry->d_name[0] == '.'
1242
and (direntry->d_name[1] == '\0'
1243
or (direntry->d_name[1] == '.'
1244
and direntry->d_name[2] == '\0'))){
1245
return 0;
1246
}
1247
return 1;
1248
}
1249
1250
/* Is this directory entry a runnable program? */
1251
int runnable_hook(const struct dirent *direntry){
1252
int ret;
1253
size_t sret;
1254
struct stat st;
1255
1256
if((direntry->d_name)[0] == '\0'){
1257
/* Empty name? */
1258
return 0;
1259
}
1260
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
"abcdefghijklmnopqrstuvwxyz"
1263
"0123456789"
1264
"_-");
1265
if((direntry->d_name)[sret] != '\0'){
1266
/* Contains non-allowed characters */
1267
if(debug){
1268
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1269
direntry->d_name);
1270
}
1271
return 0;
1272
}
1273
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1282
if(ret == -1){
1283
if(debug){
1284
perror_plus("Could not stat hook");
1285
}
1286
return 0;
1287
}
1288
if(not (S_ISREG(st.st_mode))){
1289
/* Not a regular file */
1290
if(debug){
1291
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1292
direntry->d_name);
1293
}
1294
return 0;
1295
}
1296
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1297
/* Not executable */
1298
if(debug){
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
return 1;
1305
}
1306
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1308
int ret;
1309
struct timespec now;
1310
struct timespec waited_time;
1311
intmax_t block_time;
1312
1313
while(true){
1314
if(mc.current_server == NULL){
1315
if (debug){
1316
fprintf_plus(stderr, "Wait until first server is found."
1317
" No timeout!\n");
1318
}
1319
ret = avahi_simple_poll_iterate(s, -1);
1320
} else {
1321
if (debug){
1322
fprintf_plus(stderr, "Check current_server if we should run"
1323
" it, or wait\n");
1324
}
1325
/* the current time */
1326
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1327
if(ret == -1){
1328
perror_plus("clock_gettime");
1329
return -1;
1330
}
1331
/* Calculating in ms how long time between now and server
1332
who we visted longest time ago. Now - last seen. */
1333
waited_time.tv_sec = (now.tv_sec
1334
- mc.current_server->last_seen.tv_sec);
1335
waited_time.tv_nsec = (now.tv_nsec
1336
- mc.current_server->last_seen.tv_nsec);
1337
/* total time is 10s/10,000ms.
1338
Converting to s from ms by dividing by 1,000,
1339
and ns to ms by dividing by 1,000,000. */
1340
block_time = ((retry_interval
1341
- ((intmax_t)waited_time.tv_sec * 1000))
1342
- ((intmax_t)waited_time.tv_nsec / 1000000));
1343
1344
if (debug){
1345
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1346
block_time);
1347
}
1348
1349
if(block_time <= 0){
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1354
if(ret == 0){
1355
avahi_simple_poll_quit(mc.simple_poll);
1356
return 0;
1357
}
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1359
&mc.current_server->last_seen);
1360
if(ret == -1){
1361
perror_plus("clock_gettime");
1362
return -1;
1363
}
1364
mc.current_server = mc.current_server->next;
1365
block_time = 0; /* Call avahi to find new Mandos
1366
servers, but don't block */
1367
}
1368
1369
ret = avahi_simple_poll_iterate(s, (int)block_time);
1370
}
1371
if(ret != 0){
1372
if (ret > 0 or errno != EINTR){
1373
return (ret != 1) ? ret : 0;
1374
}
1375
}
1376
}
1377
}
1378
1379
bool run_network_hooks(const char *mode, const char *interface,
1380
const float delay){
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
alphasort);
1386
if(numhooks == -1){
1387
perror_plus("scandir");
1388
} else {
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1394
if(ret < 0){
1395
perror_plus("asprintf");
1396
continue;
1397
}
1398
pid_t hook_pid = fork();
1399
if(hook_pid == 0){
1400
/* Child */
1401
dup2(devnull, STDIN_FILENO);
1402
close(devnull);
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1405
if(ret == -1){
1406
perror_plus("setenv");
1407
return false;
1408
}
1409
ret = setenv("DEVICE", interface, 1);
1410
if(ret == -1){
1411
perror_plus("setenv");
1412
return false;
1413
}
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1415
if(ret == -1){
1416
perror_plus("setenv");
1417
return false;
1418
}
1419
ret = setenv("MODE", mode, 1);
1420
if(ret == -1){
1421
perror_plus("setenv");
1422
return false;
1423
}
1424
char *delaystring;
1425
ret = asprintf(&delaystring, "%f", delay);
1426
if(ret == -1){
1427
perror_plus("asprintf");
1428
return false;
1429
}
1430
ret = setenv("DELAY", delaystring, 1);
1431
if(ret == -1){
1432
free(delaystring);
1433
perror_plus("setenv");
1434
return false;
1435
}
1436
free(delaystring);
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1439
} else {
1440
int status;
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1442
perror_plus("waitpid");
1443
free(fullname);
1444
continue;
1445
}
1446
if(WIFEXITED(status)){
1447
if(WEXITSTATUS(status) != 0){
1448
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1449
" with status %d\n", direntry->d_name,
1450
WEXITSTATUS(status));
1451
free(fullname);
1452
continue;
1453
}
1454
} else if(WIFSIGNALED(status)){
1455
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1456
" signal %d\n", direntry->d_name,
1457
WTERMSIG(status));
1458
free(fullname);
1459
continue;
1460
} else {
1461
fprintf_plus(stderr, "Warning: network hook \"%s\""
1462
" crashed\n", direntry->d_name);
1463
free(fullname);
1464
continue;
1465
}
1466
}
1467
free(fullname);
1468
if(quit_now){
1469
break;
1470
}
1471
}
1472
close(devnull);
1473
}
1474
return true;
1475
}
1476
1477
895
int main(int argc, char *argv[]){
1478
896
AvahiSServiceBrowser *sb = NULL;
1479
897
int error;
1481
899
intmax_t tmpmax;
1482
900
char *tmp;
1483
901
int exitcode = EXIT_SUCCESS;
1484
const char *interface = "";
902
const char *interface = "eth0";
1485
903
struct ifreq network;
1486
int sd = -1;
1487
bool take_down_interface = false;
904
int sd;
1488
905
uid_t uid;
1489
906
gid_t gid;
907
char *connect_to = NULL;
1490
908
char tempdir[] = "/tmp/mandosXXXXXX";
1491
909
bool tempdir_created = false;
1492
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1496
914
bool gnutls_initialized = false;
1497
915
bool gpgme_initialized = false;
1498
916
float delay = 2.5f;
1499
double retry_interval = 10; /* 10s between trying a server and
1500
retrying the same server again */
1501
917
1502
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
918
struct sigaction old_sigterm_action;
1503
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1504
920
1505
uid = getuid();
1506
gid = getgid();
1507
1508
/* Lower any group privileges we might have, just to be safe */
1509
errno = 0;
1510
ret = setgid(gid);
1511
if(ret == -1){
1512
perror_plus("setgid");
1513
}
1514
1515
/* Lower user privileges (temporarily) */
1516
errno = 0;
1517
ret = seteuid(uid);
1518
if(ret == -1){
1519
perror_plus("seteuid");
1520
}
1521
1522
if(quit_now){
1523
goto end;
1524
}
1525
1526
921
{
1527
922
struct argp_option options[] = {
1528
923
{ .name = "debug", .key = 128,
1557
952
.arg = "SECONDS",
1558
953
.doc = "Maximum delay to wait for interface startup",
1559
954
.group = 2 },
1560
{ .name = "retry", .key = 132,
1561
.arg = "SECONDS",
1562
.doc = "Retry interval used when denied by the mandos server",
1563
.group = 2 },
1564
{ .name = "network-hook-dir", .key = 133,
1565
.arg = "DIR",
1566
.doc = "Directory where network hooks are located",
1567
.group = 2 },
1568
/*
1569
* These reproduce what we would get without ARGP_NO_HELP
1570
*/
1571
{ .name = "help", .key = '?',
1572
.doc = "Give this help list", .group = -1 },
1573
{ .name = "usage", .key = -3,
1574
.doc = "Give a short usage message", .group = -1 },
1575
{ .name = "version", .key = 'V',
1576
.doc = "Print program version", .group = -1 },
1577
955
{ .name = NULL }
1578
956
};
1579
957
1580
958
error_t parse_opt(int key, char *arg,
1581
959
struct argp_state *state){
1582
errno = 0;
1583
960
switch(key){
1584
961
case 128: /* --debug */
1585
962
debug = true;
1601
978
tmpmax = strtoimax(arg, &tmp, 10);
1602
979
if(errno != 0 or tmp == arg or *tmp != '\0'
1603
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1604
argp_error(state, "Bad number of DH bits");
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1605
983
}
1606
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1607
985
break;
1612
990
errno = 0;
1613
991
delay = strtof(arg, &tmp);
1614
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
1615
argp_error(state, "Bad delay");
1616
}
1617
case 132: /* --retry */
1618
errno = 0;
1619
retry_interval = strtod(arg, &tmp);
1620
if(errno != 0 or tmp == arg or *tmp != '\0'
1621
or (retry_interval * 1000) > INT_MAX
1622
or retry_interval < 0){
1623
argp_error(state, "Bad retry interval");
1624
}
1625
break;
1626
case 133: /* --network-hook-dir */
1627
hookdir = arg;
1628
break;
1629
/*
1630
* These reproduce what we would get without ARGP_NO_HELP
1631
*/
1632
case '?': /* --help */
1633
argp_state_help(state, state->out_stream,
1634
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1635
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1636
case -3: /* --usage */
1637
argp_state_help(state, state->out_stream,
1638
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1639
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1642
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1643
exit(argp_err_exit_status);
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1644
1000
break;
1645
1001
default:
1646
1002
return ARGP_ERR_UNKNOWN;
1647
1003
}
1648
return errno;
1004
return 0;
1649
1005
}
1650
1006
1651
1007
struct argp argp = { .options = options, .parser = parse_opt,
1652
1008
.args_doc = "",
1653
1009
.doc = "Mandos client -- Get and decrypt"
1654
1010
" passwords from a Mandos server" };
1655
ret = argp_parse(&argp, argc, argv,
1656
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1657
switch(ret){
1658
case 0:
1659
break;
1660
case ENOMEM:
1661
default:
1662
errno = ret;
1663
perror_plus("argp_parse");
1664
exitcode = EX_OSERR;
1665
goto end;
1666
case EINVAL:
1667
exitcode = EX_USAGE;
1668
goto end;
1669
}
1670
}
1671
1672
{
1673
/* Work around Debian bug #633582:
1674
<http://bugs.debian.org/633582> */
1675
struct stat st;
1676
1677
/* Re-raise priviliges */
1678
errno = 0;
1679
ret = seteuid(0);
1680
if(ret == -1){
1681
perror_plus("seteuid");
1682
}
1683
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1688
} else {
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1690
if(ret == -1){
1691
perror_plus("fstat");
1692
} else {
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1696
if(ret == -1){
1697
perror_plus("fchown");
1698
}
1699
}
1700
}
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1702
}
1703
}
1704
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1709
} else {
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1711
if(ret == -1){
1712
perror_plus("fstat");
1713
} else {
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1717
if(ret == -1){
1718
perror_plus("fchown");
1719
}
1720
}
1721
}
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1723
}
1724
}
1725
1726
/* Lower privileges */
1727
errno = 0;
1728
ret = seteuid(uid);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1731
}
1732
}
1733
1734
/* Run network hooks */
1735
{
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
1741
}
1742
if(not run_network_hooks("start", interface, delay)){
1743
goto end;
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1750
1016
}
1751
1017
}
1752
1018
1754
1020
avahi_set_log_function(empty_log);
1755
1021
}
1756
1022
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1761
alphasort);
1762
if(ret == 0){
1763
/* No up interfaces, look for any good interfaces */
1764
free(direntries);
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1766
alphasort);
1767
}
1768
if(ret >= 1){
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1771
if(debug){
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1773
}
1774
if(interface == NULL){
1775
perror_plus("malloc");
1776
free(direntries);
1777
exitcode = EXIT_FAILURE;
1778
goto end;
1779
}
1780
free(direntries);
1781
} else {
1782
free(direntries);
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
1785
goto end;
1786
}
1787
}
1788
1789
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1790
1024
from the signal handler */
1791
1025
/* Initialize the pseudo-RNG for Avahi */
1792
1026
srand((unsigned int) time(NULL));
1793
1027
mc.simple_poll = avahi_simple_poll_new();
1794
1028
if(mc.simple_poll == NULL){
1795
fprintf_plus(stderr,
1796
"Avahi: Failed to create simple poll object.\n");
1797
exitcode = EX_UNAVAILABLE;
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1798
1031
goto end;
1799
1032
}
1800
1033
1801
1034
sigemptyset(&sigterm_action.sa_mask);
1802
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1803
1036
if(ret == -1){
1804
perror_plus("sigaddset");
1805
exitcode = EX_OSERR;
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1806
1039
goto end;
1807
1040
}
1808
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1809
1042
if(ret == -1){
1810
perror_plus("sigaddset");
1811
exitcode = EX_OSERR;
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1812
1045
goto end;
1813
1046
}
1814
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1815
1048
if(ret == -1){
1816
perror_plus("sigaddset");
1817
exitcode = EX_OSERR;
1818
goto end;
1819
}
1820
/* Need to check if the handler is SIG_IGN before handling:
1821
| [[info:libc:Initial Signal Actions]] |
1822
| [[info:libc:Basic Signal Handling]] |
1823
*/
1824
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1825
if(ret == -1){
1826
perror_plus("sigaction");
1827
return EX_OSERR;
1828
}
1829
if(old_sigterm_action.sa_handler != SIG_IGN){
1830
ret = sigaction(SIGINT, &sigterm_action, NULL);
1831
if(ret == -1){
1832
perror_plus("sigaction");
1833
exitcode = EX_OSERR;
1834
goto end;
1835
}
1836
}
1837
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1838
if(ret == -1){
1839
perror_plus("sigaction");
1840
return EX_OSERR;
1841
}
1842
if(old_sigterm_action.sa_handler != SIG_IGN){
1843
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1844
if(ret == -1){
1845
perror_plus("sigaction");
1846
exitcode = EX_OSERR;
1847
goto end;
1848
}
1849
}
1850
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1851
if(ret == -1){
1852
perror_plus("sigaction");
1853
return EX_OSERR;
1854
}
1855
if(old_sigterm_action.sa_handler != SIG_IGN){
1856
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1857
if(ret == -1){
1858
perror_plus("sigaction");
1859
exitcode = EX_OSERR;
1860
goto end;
1861
}
1862
}
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1863
1059
1864
1060
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
1867
if(if_index == 0){
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1870
goto end;
1871
}
1872
1873
if(quit_now){
1874
goto end;
1875
}
1876
1877
/* Re-raise priviliges */
1878
errno = 0;
1879
ret = seteuid(0);
1880
if(ret == -1){
1881
perror_plus("seteuid");
1882
}
1883
1061
if(interface[0] != '\0'){
1884
1062
#ifdef __linux__
1885
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1064
messages to mess up the prompt */
1887
1065
ret = klogctl(8, NULL, 5);
1888
1066
bool restore_loglevel = true;
1889
1067
if(ret == -1){
1890
1068
restore_loglevel = false;
1891
perror_plus("klogctl");
1069
perror("klogctl");
1892
1070
}
1893
1071
#endif /* __linux__ */
1894
1072
1895
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1896
1074
if(sd < 0){
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1899
1077
#ifdef __linux__
1900
1078
if(restore_loglevel){
1901
1079
ret = klogctl(7, NULL, 0);
1902
1080
if(ret == -1){
1903
perror_plus("klogctl");
1081
perror("klogctl");
1904
1082
}
1905
1083
}
1906
1084
#endif /* __linux__ */
1907
/* Lower privileges */
1908
errno = 0;
1909
ret = seteuid(uid);
1910
if(ret == -1){
1911
perror_plus("seteuid");
1912
}
1913
1085
goto end;
1914
1086
}
1915
1087
strcpy(network.ifr_name, interface);
1916
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1917
1089
if(ret == -1){
1918
perror_plus("ioctl SIOCGIFFLAGS");
1090
perror("ioctl SIOCGIFFLAGS");
1919
1091
#ifdef __linux__
1920
1092
if(restore_loglevel){
1921
1093
ret = klogctl(7, NULL, 0);
1922
1094
if(ret == -1){
1923
perror_plus("klogctl");
1095
perror("klogctl");
1924
1096
}
1925
1097
}
1926
1098
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1099
exitcode = EXIT_FAILURE;
1934
1100
goto end;
1935
1101
}
1936
1102
if((network.ifr_flags & IFF_UP) == 0){
1937
1103
network.ifr_flags |= IFF_UP;
1938
take_down_interface = true;
1939
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1940
1105
if(ret == -1){
1941
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1944
1108
#ifdef __linux__
1945
1109
if(restore_loglevel){
1946
1110
ret = klogctl(7, NULL, 0);
1947
1111
if(ret == -1){
1948
perror_plus("klogctl");
1112
perror("klogctl");
1949
1113
}
1950
1114
}
1951
1115
#endif /* __linux__ */
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
1116
goto end;
1959
1117
}
1960
1118
}
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1119
/* sleep checking until interface is running */
1963
1120
for(int i=0; i < delay * 4; i++){
1964
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1965
1122
if(ret == -1){
1966
perror_plus("ioctl SIOCGIFFLAGS");
1123
perror("ioctl SIOCGIFFLAGS");
1967
1124
} else if(network.ifr_flags & IFF_RUNNING){
1968
1125
break;
1969
1126
}
1970
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
1128
ret = nanosleep(&sleeptime, NULL);
1972
1129
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1130
perror("nanosleep");
1974
1131
}
1975
1132
}
1976
if(not take_down_interface){
1977
/* We won't need the socket anymore */
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1982
1136
}
1983
1137
#ifdef __linux__
1984
1138
if(restore_loglevel){
1985
1139
/* Restores kernel loglevel to default */
1986
1140
ret = klogctl(7, NULL, 0);
1987
1141
if(ret == -1){
1988
perror_plus("klogctl");
1142
perror("klogctl");
1989
1143
}
1990
1144
}
1991
1145
#endif /* __linux__ */
1992
/* Lower privileges */
1993
errno = 0;
1994
/* Lower privileges */
1995
ret = seteuid(uid);
1996
if(ret == -1){
1997
perror_plus("seteuid");
1998
}
1999
}
2000
2001
if(quit_now){
2002
goto end;
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
2003
1160
}
2004
1161
2005
1162
ret = init_gnutls_global(pubkey, seckey);
2006
1163
if(ret == -1){
2007
fprintf_plus(stderr, "init_gnutls_global failed\n");
2008
exitcode = EX_UNAVAILABLE;
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2009
1166
goto end;
2010
1167
} else {
2011
1168
gnutls_initialized = true;
2012
1169
}
2013
1170
2014
if(quit_now){
2015
goto end;
2016
}
2017
2018
1171
if(mkdtemp(tempdir) == NULL){
2019
perror_plus("mkdtemp");
1172
perror("mkdtemp");
2020
1173
goto end;
2021
1174
}
2022
1175
tempdir_created = true;
2023
1176
2024
if(quit_now){
2025
goto end;
2026
}
2027
2028
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
2029
fprintf_plus(stderr, "init_gpgme failed\n");
2030
exitcode = EX_UNAVAILABLE;
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2031
1180
goto end;
2032
1181
} else {
2033
1182
gpgme_initialized = true;
2034
1183
}
2035
1184
2036
if(quit_now){
2037
goto end;
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
2038
1192
}
2039
1193
2040
1194
if(connect_to != NULL){
2042
1196
/* (Mainly meant for debugging) */
2043
1197
char *address = strrchr(connect_to, ':');
2044
1198
if(address == NULL){
2045
fprintf_plus(stderr, "No colon in address\n");
2046
exitcode = EX_USAGE;
2047
goto end;
2048
}
2049
2050
if(quit_now){
2051
goto end;
2052
}
2053
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
2054
1203
uint16_t port;
2055
1204
errno = 0;
2056
1205
tmpmax = strtoimax(address+1, &tmp, 10);
2057
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2058
1207
or tmpmax != (uint16_t)tmpmax){
2059
fprintf_plus(stderr, "Bad port number\n");
2060
exitcode = EX_USAGE;
2061
goto end;
2062
}
2063
2064
if(quit_now){
2065
goto end;
2066
}
2067
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
2068
1212
port = (uint16_t)tmpmax;
2069
1213
*address = '\0';
1214
address = connect_to;
2070
1215
/* Colon in address indicates IPv6 */
2071
1216
int af;
2072
if(strchr(connect_to, ':') != NULL){
1217
if(strchr(address, ':') != NULL){
2073
1218
af = AF_INET6;
2074
/* Accept [] around IPv6 address - see RFC 5952 */
2075
if(connect_to[0] == '[' and address[-1] == ']')
2076
{
2077
connect_to++;
2078
address[-1] = '\0';
2079
}
2080
1219
} else {
2081
1220
af = AF_INET;
2082
1221
}
2083
address = connect_to;
2084
2085
if(quit_now){
2086
goto end;
2087
}
2088
2089
while(not quit_now){
2090
ret = start_mandos_communication(address, port, if_index, af);
2091
if(quit_now or ret == 0){
2092
break;
2093
}
2094
if(debug){
2095
fprintf_plus(stderr, "Retrying in %d seconds\n",
2096
(int)retry_interval);
2097
}
2098
sleep((int)retry_interval);
2099
}
2100
2101
if (not quit_now){
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2102
1226
exitcode = EXIT_SUCCESS;
2103
1227
}
1228
goto end;
1229
}
2104
1230
2105
goto end;
2106
}
2107
2108
if(quit_now){
2109
goto end;
2110
}
2111
2112
1231
{
2113
1232
AvahiServerConfig config;
2114
1233
/* Do not publish any local Zeroconf records */
2129
1248
2130
1249
/* Check if creating the Avahi server object succeeded */
2131
1250
if(mc.server == NULL){
2132
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2133
avahi_strerror(error));
2134
exitcode = EX_UNAVAILABLE;
2135
goto end;
2136
}
2137
2138
if(quit_now){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
2139
1254
goto end;
2140
1255
}
2141
1256
2144
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2145
1260
NULL, 0, browse_callback, NULL);
2146
1261
if(sb == NULL){
2147
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2148
avahi_strerror(avahi_server_errno(mc.server)));
2149
exitcode = EX_UNAVAILABLE;
2150
goto end;
2151
}
2152
2153
if(quit_now){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
2154
1265
goto end;
2155
1266
}
2156
1267
2157
1268
/* Run the main loop */
2158
1269
2159
1270
if(debug){
2160
fprintf_plus(stderr, "Starting Avahi loop search\n");
2161
}
2162
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2165
if(debug){
2166
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2167
(ret == 0) ? "successfully" : "with error");
2168
}
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
2169
1275
2170
1276
end:
2171
1277
2172
1278
if(debug){
2173
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2174
1280
}
2175
1281
2176
1282
/* Cleanup things */
2192
1298
if(gpgme_initialized){
2193
1299
gpgme_release(mc.ctx);
2194
1300
}
2195
2196
/* Cleans up the circular linked list of Mandos servers the client
2197
has seen */
2198
if(mc.current_server != NULL){
2199
mc.current_server->prev->next = NULL;
2200
while(mc.current_server != NULL){
2201
server *next = mc.current_server->next;
2202
free(mc.current_server);
2203
mc.current_server = next;
2204
}
2205
}
2206
2207
/* Re-raise priviliges */
2208
{
2209
errno = 0;
2210
ret = seteuid(0);
2211
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2214
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
2217
}
2218
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2222
if(ret == -1){
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2227
if(ret == -1){
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2229
}
2230
}
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
if(ret == -1){
2233
perror_plus("close");
2234
}
2235
}
2236
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
2243
2244
/* Removes the GPGME temp directory and all files inside */
1301
1302
/* Removes the temp directory used by GPGME */
2245
1303
if(tempdir_created){
2246
struct dirent **direntries = NULL;
2247
struct dirent *direntry = NULL;
2248
int numentries = scandir(tempdir, &direntries, notdotentries,
2249
alphasort);
2250
if (numentries > 0){
2251
for(int i = 0; i < numentries; i++){
2252
direntry = direntries[i];
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
2253
1324
char *fullname = NULL;
2254
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
2255
1326
direntry->d_name);
2256
1327
if(ret < 0){
2257
perror_plus("asprintf");
1328
perror("asprintf");
2258
1329
continue;
2259
1330
}
2260
1331
ret = remove(fullname);
2261
1332
if(ret == -1){
2262
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2263
strerror(errno));
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
2264
1335
}
2265
1336
free(fullname);
2266
1337
}
2267
}
2268
2269
/* need to clean even if 0 because man page doesn't specify */
2270
free(direntries);
2271
if (numentries == -1){
2272
perror_plus("scandir");
1338
closedir(d);
2273
1339
}
2274
1340
ret = rmdir(tempdir);
2275
1341
if(ret == -1 and errno != ENOENT){
2276
perror_plus("rmdir");
2277
}
2278
}
2279
2280
if(quit_now){
2281
sigemptyset(&old_sigterm_action.sa_mask);
2282
old_sigterm_action.sa_handler = SIG_DFL;
2283
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2284
&old_sigterm_action,
2285
NULL));
2286
if(ret == -1){
2287
perror_plus("sigaction");
2288
}
2289
do {
2290
ret = raise(signal_received);
2291
} while(ret != 0 and errno == EINTR);
2292
if(ret != 0){
2293
perror_plus("raise");
2294
abort();
2295
}
2296
TEMP_FAILURE_RETRY(pause());
1342
perror("rmdir");
1343
}
2297
1344
}
2298
1345
2299
1346
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0