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- Committer: Teddy Hogeborn
- Date: 2009-09-08 04:41:37 UTC
- Revision ID: teddy@fukt.bsnet.se-20090908044137-4cxubotvn4etoxxl
* plugins.d/mandos-client.c (main): Bug fix: Check result of setgid().
Bug fix: If taking down network
interface, do not drop privileges
completely; save them and reassert
privileges when needed.
Bug fix: If taking down network
interface, do not drop privileges
completely; save them and reassert
privileges when needed.
- 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 */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
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() */
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){
245
167
gpgme_error_t rc;
246
168
gpgme_engine_info_t engine_info;
247
169
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
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
312
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");
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
401
319
recipient = recipient->next;
402
320
}
403
321
}
406
324
}
407
325
408
326
if(debug){
409
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
410
328
}
411
329
412
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
413
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
414
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
415
333
plaintext_length = -1;
416
334
goto decrypt_end;
417
335
}
419
337
*plaintext = NULL;
420
338
while(true){
421
339
plaintext_capacity = incbuffer(plaintext,
422
(size_t)plaintext_length,
423
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
424
342
if(plaintext_capacity == 0){
425
perror_plus("incbuffer");
426
plaintext_length = -1;
427
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
428
346
}
429
347
430
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
435
353
break;
436
354
}
437
355
if(ret < 0){
438
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
439
357
plaintext_length = -1;
440
358
goto decrypt_end;
441
359
}
443
361
}
444
362
445
363
if(debug){
446
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
447
365
for(ssize_t i = 0; i < plaintext_length; i++){
448
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
449
367
}
471
389
/* GnuTLS log function callback */
472
390
static void debuggnutls(__attribute__((unused)) int level,
473
391
const char* string){
474
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
475
393
}
476
394
477
395
static int init_gnutls_global(const char *pubkeyfilename,
479
397
int ret;
480
398
481
399
if(debug){
482
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
483
401
}
484
402
485
403
ret = gnutls_global_init();
486
404
if(ret != GNUTLS_E_SUCCESS){
487
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
488
safer_gnutls_strerror(ret));
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
489
407
return -1;
490
408
}
491
409
498
416
}
499
417
500
418
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
502
420
if(ret != GNUTLS_E_SUCCESS){
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
505
426
gnutls_global_deinit();
506
427
return -1;
507
428
}
508
429
509
430
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);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
514
434
}
515
435
516
436
ret = gnutls_certificate_set_openpgp_key_file
517
437
(mc.cred, pubkeyfilename, seckeyfilename,
518
438
GNUTLS_OPENPGP_FMT_BASE64);
519
439
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));
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
525
445
goto globalfail;
526
446
}
527
447
528
448
/* GnuTLS server initialization */
529
449
ret = gnutls_dh_params_init(&mc.dh_params);
530
450
if(ret != GNUTLS_E_SUCCESS){
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
" initialization: %s\n",
533
safer_gnutls_strerror(ret));
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
534
453
goto globalfail;
535
454
}
536
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
537
456
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
540
459
goto globalfail;
541
460
}
542
461
555
474
static int init_gnutls_session(gnutls_session_t *session){
556
475
int ret;
557
476
/* 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);
477
ret = gnutls_init(session, GNUTLS_SERVER);
564
478
if(ret != GNUTLS_E_SUCCESS){
565
fprintf_plus(stderr,
566
"Error in GnuTLS session initialization: %s\n",
567
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
568
481
}
569
482
570
483
{
571
484
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);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
579
486
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));
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
583
490
gnutls_deinit(*session);
584
491
return -1;
585
492
}
586
493
}
587
494
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);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
596
497
if(ret != GNUTLS_E_SUCCESS){
597
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
598
safer_gnutls_strerror(ret));
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
599
500
gnutls_deinit(*session);
600
501
return -1;
601
502
}
602
503
603
504
/* ignore client certificate if any. */
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
605
507
606
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
607
509
612
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
613
515
__attribute__((unused)) const char *txt){}
614
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
615
520
/* Called when a Mandos server is found */
616
521
static int start_mandos_communication(const char *ip, uint16_t port,
617
522
AvahiIfIndex if_index,
623
528
struct sockaddr_in6 in6;
624
529
} to;
625
530
char *buffer = NULL;
626
char *decrypted_buffer = NULL;
531
char *decrypted_buffer;
627
532
size_t buffer_length = 0;
628
533
size_t buffer_capacity = 0;
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
539
if(quit_now){
637
errno = EINTR;
638
540
return -1;
639
541
}
640
542
646
548
pf = PF_INET;
647
549
break;
648
550
default:
649
fprintf_plus(stderr, "Bad address family: %d\n", af);
650
errno = EINVAL;
551
fprintf(stderr, "Bad address family: %d\n", af);
651
552
return -1;
652
553
}
653
554
657
558
}
658
559
659
560
if(debug){
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
562
"\n", ip, port);
662
563
}
663
564
664
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
665
566
if(tcp_sd < 0){
666
int e = errno;
667
perror_plus("socket");
668
errno = e;
567
perror("socket");
568
retval = -1;
669
569
goto mandos_end;
670
570
}
671
571
672
572
if(quit_now){
673
errno = EINTR;
674
573
goto mandos_end;
675
574
}
676
575
683
582
ret = inet_pton(af, ip, &to.in.sin_addr);
684
583
}
685
584
if(ret < 0 ){
686
int e = errno;
687
perror_plus("inet_pton");
688
errno = e;
585
perror("inet_pton");
586
retval = -1;
689
587
goto mandos_end;
690
588
}
691
589
if(ret == 0){
692
int e = errno;
693
fprintf_plus(stderr, "Bad address: %s\n", ip);
694
errno = e;
590
fprintf(stderr, "Bad address: %s\n", ip);
591
retval = -1;
695
592
goto mandos_end;
696
593
}
697
594
if(af == AF_INET6){
701
598
702
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
601
-Wunreachable-code*/
705
602
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;
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
605
retval = -1;
709
606
goto mandos_end;
710
607
}
711
608
/* Set the network interface number as scope */
718
615
}
719
616
720
617
if(quit_now){
721
errno = EINTR;
722
618
goto mandos_end;
723
619
}
724
620
726
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
727
623
char interface[IF_NAMESIZE];
728
624
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
perror_plus("if_indextoname");
625
perror("if_indextoname");
730
626
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
733
629
}
734
630
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
737
633
}
738
634
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
635
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
642
sizeof(addrstr));
747
643
}
748
644
if(pcret == NULL){
749
perror_plus("inet_ntop");
645
perror("inet_ntop");
750
646
} else {
751
647
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
648
fprintf(stderr, "Canonical address form: %s\n", addrstr);
753
649
}
754
650
}
755
651
}
756
652
757
653
if(quit_now){
758
errno = EINTR;
759
654
goto mandos_end;
760
655
}
761
656
765
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
766
661
}
767
662
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
int e = errno;
770
perror_plus("connect");
771
errno = e;
772
}
663
perror("connect");
664
retval = -1;
773
665
goto mandos_end;
774
666
}
775
667
776
668
if(quit_now){
777
errno = EINTR;
778
669
goto mandos_end;
779
670
}
780
671
783
674
while(true){
784
675
size_t out_size = strlen(out);
785
676
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
786
out_size - written));
677
out_size - written));
787
678
if(ret == -1){
788
int e = errno;
789
perror_plus("write");
790
errno = e;
679
perror("write");
680
retval = -1;
791
681
goto mandos_end;
792
682
}
793
683
written += (size_t)ret;
803
693
}
804
694
805
695
if(quit_now){
806
errno = EINTR;
807
696
goto mandos_end;
808
697
}
809
698
}
810
699
811
700
if(debug){
812
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
813
702
}
814
703
815
704
if(quit_now){
816
errno = EINTR;
817
705
goto mandos_end;
818
706
}
819
707
820
/* Spurious warning from -Wint-to-pointer-cast */
821
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
822
709
823
710
if(quit_now){
824
errno = EINTR;
825
711
goto mandos_end;
826
712
}
827
713
828
714
do {
829
715
ret = gnutls_handshake(session);
830
716
if(quit_now){
831
errno = EINTR;
832
717
goto mandos_end;
833
718
}
834
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
835
720
836
721
if(ret != GNUTLS_E_SUCCESS){
837
722
if(debug){
838
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
723
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
839
724
gnutls_perror(ret);
840
725
}
841
errno = EPROTO;
726
retval = -1;
842
727
goto mandos_end;
843
728
}
844
729
845
730
/* Read OpenPGP packet that contains the wanted password */
846
731
847
732
if(debug){
848
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
849
" %s\n", ip);
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
734
ip);
850
735
}
851
736
852
737
while(true){
853
738
854
739
if(quit_now){
855
errno = EINTR;
856
740
goto mandos_end;
857
741
}
858
742
859
743
buffer_capacity = incbuffer(&buffer, buffer_length,
860
buffer_capacity);
744
buffer_capacity);
861
745
if(buffer_capacity == 0){
862
int e = errno;
863
perror_plus("incbuffer");
864
errno = e;
746
perror("incbuffer");
747
retval = -1;
865
748
goto mandos_end;
866
749
}
867
750
868
751
if(quit_now){
869
errno = EINTR;
870
752
goto mandos_end;
871
753
}
872
754
885
767
ret = gnutls_handshake(session);
886
768
887
769
if(quit_now){
888
errno = EINTR;
889
770
goto mandos_end;
890
771
}
891
772
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
892
773
if(ret < 0){
893
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
894
"***\n");
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
895
775
gnutls_perror(ret);
896
errno = EPROTO;
776
retval = -1;
897
777
goto mandos_end;
898
778
}
899
779
break;
900
780
default:
901
fprintf_plus(stderr, "Unknown error while reading data from"
902
" encrypted session with Mandos server\n");
781
fprintf(stderr, "Unknown error while reading data from"
782
" encrypted session with Mandos server\n");
783
retval = -1;
903
784
gnutls_bye(session, GNUTLS_SHUT_RDWR);
904
errno = EIO;
905
785
goto mandos_end;
906
786
}
907
787
} else {
910
790
}
911
791
912
792
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);
793
fprintf(stderr, "Closing TLS session\n");
794
}
795
796
if(quit_now){
797
goto mandos_end;
798
}
799
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
802
if(quit_now){
803
goto mandos_end;
804
}
928
805
929
806
if(buffer_length > 0){
930
807
ssize_t decrypted_buffer_size;
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
809
buffer_length,
932
810
&decrypted_buffer);
933
811
if(decrypted_buffer_size >= 0){
934
812
935
813
written = 0;
936
814
while(written < (size_t) decrypted_buffer_size){
937
815
if(quit_now){
938
errno = EINTR;
939
816
goto mandos_end;
940
817
}
941
818
943
820
(size_t)decrypted_buffer_size - written,
944
821
stdout);
945
822
if(ret == 0 and ferror(stdout)){
946
int e = errno;
947
823
if(debug){
948
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
949
strerror(errno));
824
fprintf(stderr, "Error writing encrypted data: %s\n",
825
strerror(errno));
950
826
}
951
errno = e;
952
goto mandos_end;
827
retval = -1;
828
break;
953
829
}
954
830
written += (size_t)ret;
955
831
}
956
retval = 0;
832
free(decrypted_buffer);
833
} else {
834
retval = -1;
957
835
}
836
} else {
837
retval = -1;
958
838
}
959
839
960
840
/* Shutdown procedure */
961
841
962
842
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
}
843
free(buffer);
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
847
if(ret == -1){
848
perror("close");
849
}
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
982
853
}
983
854
return retval;
984
855
}
1009
880
switch(event){
1010
881
default:
1011
882
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)));
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
884
" of type '%s' in domain '%s': %s\n", name, type, domain,
885
avahi_strerror(avahi_server_errno(mc.server)));
1016
886
break;
1017
887
1018
888
case AVAHI_RESOLVER_FOUND:
1020
890
char ip[AVAHI_ADDRESS_STR_MAX];
1021
891
avahi_address_snprint(ip, sizeof(ip), address);
1022
892
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);
893
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
ip, (intmax_t)interface, port);
1026
896
}
1027
897
int ret = start_mandos_communication(ip, port, interface,
1028
898
avahi_proto_to_af(proto));
1029
899
if(ret == 0){
1030
900
avahi_simple_poll_quit(mc.simple_poll);
1031
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1034
901
}
1035
902
}
1036
903
}
1060
927
default:
1061
928
case AVAHI_BROWSER_FAILURE:
1062
929
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
930
fprintf(stderr, "(Avahi browser) %s\n",
931
avahi_strerror(avahi_server_errno(mc.server)));
1065
932
avahi_simple_poll_quit(mc.simple_poll);
1066
933
return;
1067
934
1074
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
942
name, type, domain, protocol, 0,
1076
943
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)));
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
945
name, avahi_strerror(avahi_server_errno(mc.server)));
1080
946
break;
1081
947
1082
948
case AVAHI_BROWSER_REMOVE:
1085
951
case AVAHI_BROWSER_ALL_FOR_NOW:
1086
952
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1087
953
if(debug){
1088
fprintf_plus(stderr, "No Mandos server found, still"
1089
" searching...\n");
954
fprintf(stderr, "No Mandos server found, still searching...\n");
1090
955
}
1091
956
break;
1092
957
}
1093
958
}
1094
959
1095
/* Signal handler that stops main loop after SIGTERM */
960
/* stop main loop after sigterm has been called */
1096
961
static void handle_sigterm(int sig){
1097
962
if(quit_now){
1098
963
return;
1100
965
quit_now = 1;
1101
966
signal_received = sig;
1102
967
int old_errno = errno;
1103
/* set main loop to exit */
1104
968
if(mc.simple_poll != NULL){
1105
969
avahi_simple_poll_quit(mc.simple_poll);
1106
970
}
1107
971
errno = old_errno;
1108
972
}
1109
973
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[i];
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
if(debug){
1399
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1400
direntry->d_name);
1401
}
1402
pid_t hook_pid = fork();
1403
if(hook_pid == 0){
1404
/* Child */
1405
dup2(devnull, STDIN_FILENO);
1406
close(devnull);
1407
dup2(STDERR_FILENO, STDOUT_FILENO);
1408
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1409
if(ret == -1){
1410
perror_plus("setenv");
1411
return false;
1412
}
1413
ret = setenv("DEVICE", interface, 1);
1414
if(ret == -1){
1415
perror_plus("setenv");
1416
return false;
1417
}
1418
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1419
if(ret == -1){
1420
perror_plus("setenv");
1421
return false;
1422
}
1423
ret = setenv("MODE", mode, 1);
1424
if(ret == -1){
1425
perror_plus("setenv");
1426
return false;
1427
}
1428
char *delaystring;
1429
ret = asprintf(&delaystring, "%f", delay);
1430
if(ret == -1){
1431
perror_plus("asprintf");
1432
return false;
1433
}
1434
ret = setenv("DELAY", delaystring, 1);
1435
if(ret == -1){
1436
free(delaystring);
1437
perror_plus("setenv");
1438
return false;
1439
}
1440
free(delaystring);
1441
ret = execl(fullname, direntry->d_name, mode, NULL);
1442
perror_plus("execl");
1443
} else {
1444
int status;
1445
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1446
perror_plus("waitpid");
1447
free(fullname);
1448
continue;
1449
}
1450
if(WIFEXITED(status)){
1451
if(WEXITSTATUS(status) != 0){
1452
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1453
" with status %d\n", direntry->d_name,
1454
WEXITSTATUS(status));
1455
free(fullname);
1456
continue;
1457
}
1458
} else if(WIFSIGNALED(status)){
1459
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1460
" signal %d\n", direntry->d_name,
1461
WTERMSIG(status));
1462
free(fullname);
1463
continue;
1464
} else {
1465
fprintf_plus(stderr, "Warning: network hook \"%s\""
1466
" crashed\n", direntry->d_name);
1467
free(fullname);
1468
continue;
1469
}
1470
}
1471
free(fullname);
1472
if(quit_now){
1473
break;
1474
}
1475
}
1476
close(devnull);
1477
}
1478
return true;
1479
}
1480
1481
974
int main(int argc, char *argv[]){
1482
975
AvahiSServiceBrowser *sb = NULL;
1483
976
int error;
1485
978
intmax_t tmpmax;
1486
979
char *tmp;
1487
980
int exitcode = EXIT_SUCCESS;
1488
const char *interface = "";
981
const char *interface = "eth0";
1489
982
struct ifreq network;
1490
983
int sd = -1;
1491
984
bool take_down_interface = false;
1492
985
uid_t uid;
1493
986
gid_t gid;
987
char *connect_to = NULL;
1494
988
char tempdir[] = "/tmp/mandosXXXXXX";
1495
989
bool tempdir_created = false;
1496
990
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1500
994
bool gnutls_initialized = false;
1501
995
bool gpgme_initialized = false;
1502
996
float delay = 2.5f;
1503
double retry_interval = 10; /* 10s between trying a server and
1504
retrying the same server again */
1505
997
1506
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
998
struct sigaction old_sigterm_action;
1507
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1508
1000
1509
uid = getuid();
1510
gid = getgid();
1511
1512
/* Lower any group privileges we might have, just to be safe */
1513
errno = 0;
1514
ret = setgid(gid);
1515
if(ret == -1){
1516
perror_plus("setgid");
1517
}
1518
1519
/* Lower user privileges (temporarily) */
1520
errno = 0;
1521
ret = seteuid(uid);
1522
if(ret == -1){
1523
perror_plus("seteuid");
1524
}
1525
1526
if(quit_now){
1527
goto end;
1528
}
1529
1530
1001
{
1531
1002
struct argp_option options[] = {
1532
1003
{ .name = "debug", .key = 128,
1561
1032
.arg = "SECONDS",
1562
1033
.doc = "Maximum delay to wait for interface startup",
1563
1034
.group = 2 },
1564
{ .name = "retry", .key = 132,
1565
.arg = "SECONDS",
1566
.doc = "Retry interval used when denied by the mandos server",
1567
.group = 2 },
1568
{ .name = "network-hook-dir", .key = 133,
1569
.arg = "DIR",
1570
.doc = "Directory where network hooks are located",
1571
.group = 2 },
1572
/*
1573
* These reproduce what we would get without ARGP_NO_HELP
1574
*/
1575
{ .name = "help", .key = '?',
1576
.doc = "Give this help list", .group = -1 },
1577
{ .name = "usage", .key = -3,
1578
.doc = "Give a short usage message", .group = -1 },
1579
{ .name = "version", .key = 'V',
1580
.doc = "Print program version", .group = -1 },
1581
1035
{ .name = NULL }
1582
1036
};
1583
1037
1584
1038
error_t parse_opt(int key, char *arg,
1585
1039
struct argp_state *state){
1586
errno = 0;
1587
1040
switch(key){
1588
1041
case 128: /* --debug */
1589
1042
debug = true;
1605
1058
tmpmax = strtoimax(arg, &tmp, 10);
1606
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
1607
1060
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1608
argp_error(state, "Bad number of DH bits");
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
1609
1063
}
1610
1064
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1611
1065
break;
1616
1070
errno = 0;
1617
1071
delay = strtof(arg, &tmp);
1618
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
1619
argp_error(state, "Bad delay");
1620
}
1621
case 132: /* --retry */
1622
errno = 0;
1623
retry_interval = strtod(arg, &tmp);
1624
if(errno != 0 or tmp == arg or *tmp != '\0'
1625
or (retry_interval * 1000) > INT_MAX
1626
or retry_interval < 0){
1627
argp_error(state, "Bad retry interval");
1628
}
1629
break;
1630
case 133: /* --network-hook-dir */
1631
hookdir = arg;
1632
break;
1633
/*
1634
* These reproduce what we would get without ARGP_NO_HELP
1635
*/
1636
case '?': /* --help */
1637
argp_state_help(state, state->out_stream,
1638
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1639
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1640
case -3: /* --usage */
1641
argp_state_help(state, state->out_stream,
1642
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1643
case 'V': /* --version */
1644
fprintf_plus(state->out_stream,
1645
"Mandos plugin mandos-client: ");
1646
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1647
exit(argp_err_exit_status);
1073
fprintf(stderr, "Bad delay\n");
1074
exit(EXIT_FAILURE);
1075
}
1076
break;
1077
case ARGP_KEY_ARG:
1078
argp_usage(state);
1079
case ARGP_KEY_END:
1648
1080
break;
1649
1081
default:
1650
1082
return ARGP_ERR_UNKNOWN;
1651
1083
}
1652
return errno;
1084
return 0;
1653
1085
}
1654
1086
1655
1087
struct argp argp = { .options = options, .parser = parse_opt,
1656
1088
.args_doc = "",
1657
1089
.doc = "Mandos client -- Get and decrypt"
1658
1090
" passwords from a Mandos server" };
1659
ret = argp_parse(&argp, argc, argv,
1660
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1661
switch(ret){
1662
case 0:
1663
break;
1664
case ENOMEM:
1665
default:
1666
errno = ret;
1667
perror_plus("argp_parse");
1668
exitcode = EX_OSERR;
1669
goto end;
1670
case EINVAL:
1671
exitcode = EX_USAGE;
1672
goto end;
1673
}
1674
}
1675
1676
if(getuid() == 0){
1677
/* Work around Debian bug #633582:
1678
<http://bugs.debian.org/633582> */
1679
struct stat st;
1680
1681
/* Re-raise priviliges */
1682
errno = 0;
1683
ret = seteuid(0);
1684
if(ret == -1){
1685
perror_plus("seteuid");
1686
}
1687
1688
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1689
int seckey_fd = open(seckey, O_RDONLY);
1690
if(seckey_fd == -1){
1691
perror_plus("open");
1692
} else {
1693
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1694
if(ret == -1){
1695
perror_plus("fstat");
1696
} else {
1697
if(S_ISREG(st.st_mode)
1698
and st.st_uid == 0 and st.st_gid == 0){
1699
ret = fchown(seckey_fd, uid, gid);
1700
if(ret == -1){
1701
perror_plus("fchown");
1702
}
1703
}
1704
}
1705
TEMP_FAILURE_RETRY(close(seckey_fd));
1706
}
1707
}
1708
1709
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1710
int pubkey_fd = open(pubkey, O_RDONLY);
1711
if(pubkey_fd == -1){
1712
perror_plus("open");
1713
} else {
1714
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1715
if(ret == -1){
1716
perror_plus("fstat");
1717
} else {
1718
if(S_ISREG(st.st_mode)
1719
and st.st_uid == 0 and st.st_gid == 0){
1720
ret = fchown(pubkey_fd, uid, gid);
1721
if(ret == -1){
1722
perror_plus("fchown");
1723
}
1724
}
1725
}
1726
TEMP_FAILURE_RETRY(close(pubkey_fd));
1727
}
1728
}
1729
1730
/* Lower privileges */
1731
errno = 0;
1732
ret = seteuid(uid);
1733
if(ret == -1){
1734
perror_plus("seteuid");
1735
}
1736
}
1737
1738
/* Run network hooks */
1739
{
1740
if(getuid() == 0){
1741
/* Re-raise priviliges */
1742
errno = 0;
1743
ret = seteuid(0);
1744
if(ret == -1){
1745
perror_plus("seteuid");
1746
}
1747
}
1748
if(not run_network_hooks("start", interface, delay)){
1749
goto end;
1750
}
1751
if(getuid() == 0){
1752
/* Lower privileges */
1753
errno = 0;
1754
ret = seteuid(uid);
1755
if(ret == -1){
1756
perror_plus("seteuid");
1757
}
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
1095
goto end;
1758
1096
}
1759
1097
}
1760
1098
1762
1100
avahi_set_log_function(empty_log);
1763
1101
}
1764
1102
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1781
}
1782
if(interface == NULL){
1783
perror_plus("malloc");
1784
free(direntries);
1785
exitcode = EXIT_FAILURE;
1786
goto end;
1787
}
1788
free(direntries);
1789
} else {
1790
free(direntries);
1791
fprintf_plus(stderr, "Could not find a network interface\n");
1792
exitcode = EXIT_FAILURE;
1793
goto end;
1794
}
1795
}
1796
1797
1103
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1798
1104
from the signal handler */
1799
1105
/* Initialize the pseudo-RNG for Avahi */
1800
1106
srand((unsigned int) time(NULL));
1801
1107
mc.simple_poll = avahi_simple_poll_new();
1802
1108
if(mc.simple_poll == NULL){
1803
fprintf_plus(stderr,
1804
"Avahi: Failed to create simple poll object.\n");
1805
exitcode = EX_UNAVAILABLE;
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
1806
1111
goto end;
1807
1112
}
1808
1113
1809
1114
sigemptyset(&sigterm_action.sa_mask);
1810
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1811
1116
if(ret == -1){
1812
perror_plus("sigaddset");
1813
exitcode = EX_OSERR;
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
1814
1119
goto end;
1815
1120
}
1816
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1817
1122
if(ret == -1){
1818
perror_plus("sigaddset");
1819
exitcode = EX_OSERR;
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
1820
1125
goto end;
1821
1126
}
1822
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1823
1128
if(ret == -1){
1824
perror_plus("sigaddset");
1825
exitcode = EX_OSERR;
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
1826
1131
goto end;
1827
1132
}
1828
1133
/* Need to check if the handler is SIG_IGN before handling:
1831
1136
*/
1832
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1833
1138
if(ret == -1){
1834
perror_plus("sigaction");
1835
return EX_OSERR;
1139
perror("sigaction");
1140
return EXIT_FAILURE;
1836
1141
}
1837
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
1838
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
1839
1144
if(ret == -1){
1840
perror_plus("sigaction");
1841
exitcode = EX_OSERR;
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
1842
1147
goto end;
1843
1148
}
1844
1149
}
1845
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1846
1151
if(ret == -1){
1847
perror_plus("sigaction");
1848
return EX_OSERR;
1152
perror("sigaction");
1153
return EXIT_FAILURE;
1849
1154
}
1850
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
1851
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1852
1157
if(ret == -1){
1853
perror_plus("sigaction");
1854
exitcode = EX_OSERR;
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
1855
1160
goto end;
1856
1161
}
1857
1162
}
1858
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1859
1164
if(ret == -1){
1860
perror_plus("sigaction");
1861
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1862
1167
}
1863
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1864
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1865
1170
if(ret == -1){
1866
perror_plus("sigaction");
1867
exitcode = EX_OSERR;
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1868
1173
goto end;
1869
1174
}
1870
1175
}
1871
1176
1872
1177
/* If the interface is down, bring it up */
1873
if(strcmp(interface, "none") != 0){
1178
if(interface[0] != '\0'){
1874
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
1875
1180
if(if_index == 0){
1876
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1877
exitcode = EX_UNAVAILABLE;
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1878
1183
goto end;
1879
1184
}
1880
1185
1882
1187
goto end;
1883
1188
}
1884
1189
1885
/* Re-raise priviliges */
1886
errno = 0;
1887
ret = seteuid(0);
1888
if(ret == -1){
1889
perror_plus("seteuid");
1890
}
1891
1892
1190
#ifdef __linux__
1893
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1894
messages about the network interface to mess up the prompt */
1192
messages to mess up the prompt */
1895
1193
ret = klogctl(8, NULL, 5);
1896
1194
bool restore_loglevel = true;
1897
1195
if(ret == -1){
1898
1196
restore_loglevel = false;
1899
perror_plus("klogctl");
1197
perror("klogctl");
1900
1198
}
1901
1199
#endif /* __linux__ */
1902
1200
1903
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1904
1202
if(sd < 0){
1905
perror_plus("socket");
1906
exitcode = EX_OSERR;
1203
perror("socket");
1204
exitcode = EXIT_FAILURE;
1907
1205
#ifdef __linux__
1908
1206
if(restore_loglevel){
1909
1207
ret = klogctl(7, NULL, 0);
1910
1208
if(ret == -1){
1911
perror_plus("klogctl");
1209
perror("klogctl");
1912
1210
}
1913
1211
}
1914
1212
#endif /* __linux__ */
1915
/* Lower privileges */
1916
errno = 0;
1917
ret = seteuid(uid);
1918
if(ret == -1){
1919
perror_plus("seteuid");
1920
}
1921
1213
goto end;
1922
1214
}
1923
1215
strcpy(network.ifr_name, interface);
1924
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1925
1217
if(ret == -1){
1926
perror_plus("ioctl SIOCGIFFLAGS");
1218
perror("ioctl SIOCGIFFLAGS");
1927
1219
#ifdef __linux__
1928
1220
if(restore_loglevel){
1929
1221
ret = klogctl(7, NULL, 0);
1930
1222
if(ret == -1){
1931
perror_plus("klogctl");
1223
perror("klogctl");
1932
1224
}
1933
1225
}
1934
1226
#endif /* __linux__ */
1935
exitcode = EX_OSERR;
1936
/* Lower privileges */
1937
errno = 0;
1938
ret = seteuid(uid);
1939
if(ret == -1){
1940
perror_plus("seteuid");
1941
}
1227
exitcode = EXIT_FAILURE;
1942
1228
goto end;
1943
1229
}
1944
1230
if((network.ifr_flags & IFF_UP) == 0){
1947
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1948
1234
if(ret == -1){
1949
1235
take_down_interface = false;
1950
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1951
exitcode = EX_OSERR;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1952
1238
#ifdef __linux__
1953
1239
if(restore_loglevel){
1954
1240
ret = klogctl(7, NULL, 0);
1955
1241
if(ret == -1){
1956
perror_plus("klogctl");
1242
perror("klogctl");
1957
1243
}
1958
1244
}
1959
1245
#endif /* __linux__ */
1960
/* Lower privileges */
1961
errno = 0;
1962
ret = seteuid(uid);
1963
if(ret == -1){
1964
perror_plus("seteuid");
1965
}
1966
1246
goto end;
1967
1247
}
1968
1248
}
1969
/* Sleep checking until interface is running.
1970
Check every 0.25s, up to total time of delay */
1249
/* sleep checking until interface is running */
1971
1250
for(int i=0; i < delay * 4; i++){
1972
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1973
1252
if(ret == -1){
1974
perror_plus("ioctl SIOCGIFFLAGS");
1253
perror("ioctl SIOCGIFFLAGS");
1975
1254
} else if(network.ifr_flags & IFF_RUNNING){
1976
1255
break;
1977
1256
}
1978
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
1979
1258
ret = nanosleep(&sleeptime, NULL);
1980
1259
if(ret == -1 and errno != EINTR){
1981
perror_plus("nanosleep");
1260
perror("nanosleep");
1982
1261
}
1983
1262
}
1984
1263
if(not take_down_interface){
1985
1264
/* We won't need the socket anymore */
1986
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1987
1266
if(ret == -1){
1988
perror_plus("close");
1267
perror("close");
1989
1268
}
1990
1269
}
1991
1270
#ifdef __linux__
1993
1272
/* Restores kernel loglevel to default */
1994
1273
ret = klogctl(7, NULL, 0);
1995
1274
if(ret == -1){
1996
perror_plus("klogctl");
1275
perror("klogctl");
1997
1276
}
1998
1277
}
1999
1278
#endif /* __linux__ */
2000
/* Lower privileges */
2001
errno = 0;
2002
/* Lower privileges */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1283
}
1284
1285
uid = getuid();
1286
gid = getgid();
1287
1288
/* Drop any group privileges we might have, just to be safe */
1289
errno = 0;
1290
ret = setgid(gid);
1291
if(ret == -1){
1292
perror("setgid");
1293
}
1294
1295
/* Drop user privileges */
1296
errno = 0;
1297
/* Will we need privileges later? */
1298
if(take_down_interface){
1299
/* Drop user privileges temporarily */
2003
1300
ret = seteuid(uid);
2004
1301
if(ret == -1){
2005
perror_plus("seteuid");
1302
perror("seteuid");
1303
}
1304
} else {
1305
/* Drop user privileges permanently */
1306
ret = setuid(uid);
1307
if(ret == -1){
1308
perror("setuid");
2006
1309
}
2007
1310
}
2008
1311
2012
1315
2013
1316
ret = init_gnutls_global(pubkey, seckey);
2014
1317
if(ret == -1){
2015
fprintf_plus(stderr, "init_gnutls_global failed\n");
2016
exitcode = EX_UNAVAILABLE;
1318
fprintf(stderr, "init_gnutls_global failed\n");
1319
exitcode = EXIT_FAILURE;
2017
1320
goto end;
2018
1321
} else {
2019
1322
gnutls_initialized = true;
2023
1326
goto end;
2024
1327
}
2025
1328
1329
tempdir_created = true;
2026
1330
if(mkdtemp(tempdir) == NULL){
2027
perror_plus("mkdtemp");
1331
tempdir_created = false;
1332
perror("mkdtemp");
2028
1333
goto end;
2029
1334
}
2030
tempdir_created = true;
2031
1335
2032
1336
if(quit_now){
2033
1337
goto end;
2034
1338
}
2035
1339
2036
1340
if(not init_gpgme(pubkey, seckey, tempdir)){
2037
fprintf_plus(stderr, "init_gpgme failed\n");
2038
exitcode = EX_UNAVAILABLE;
1341
fprintf(stderr, "init_gpgme failed\n");
1342
exitcode = EXIT_FAILURE;
2039
1343
goto end;
2040
1344
} else {
2041
1345
gpgme_initialized = true;
2050
1354
/* (Mainly meant for debugging) */
2051
1355
char *address = strrchr(connect_to, ':');
2052
1356
if(address == NULL){
2053
fprintf_plus(stderr, "No colon in address\n");
2054
exitcode = EX_USAGE;
1357
fprintf(stderr, "No colon in address\n");
1358
exitcode = EXIT_FAILURE;
2055
1359
goto end;
2056
1360
}
2057
1361
2064
1368
tmpmax = strtoimax(address+1, &tmp, 10);
2065
1369
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2066
1370
or tmpmax != (uint16_t)tmpmax){
2067
fprintf_plus(stderr, "Bad port number\n");
2068
exitcode = EX_USAGE;
1371
fprintf(stderr, "Bad port number\n");
1372
exitcode = EXIT_FAILURE;
2069
1373
goto end;
2070
1374
}
2071
1375
2075
1379
2076
1380
port = (uint16_t)tmpmax;
2077
1381
*address = '\0';
1382
address = connect_to;
2078
1383
/* Colon in address indicates IPv6 */
2079
1384
int af;
2080
if(strchr(connect_to, ':') != NULL){
1385
if(strchr(address, ':') != NULL){
2081
1386
af = AF_INET6;
2082
/* Accept [] around IPv6 address - see RFC 5952 */
2083
if(connect_to[0] == '[' and address[-1] == ']')
2084
{
2085
connect_to++;
2086
address[-1] = '\0';
2087
}
2088
1387
} else {
2089
1388
af = AF_INET;
2090
1389
}
2091
address = connect_to;
2092
1390
2093
1391
if(quit_now){
2094
1392
goto end;
2095
1393
}
2096
1394
2097
while(not quit_now){
2098
ret = start_mandos_communication(address, port, if_index, af);
2099
if(quit_now or ret == 0){
2100
break;
2101
}
2102
if(debug){
2103
fprintf_plus(stderr, "Retrying in %d seconds\n",
2104
(int)retry_interval);
2105
}
2106
sleep((int)retry_interval);
2107
}
2108
2109
if (not quit_now){
1395
ret = start_mandos_communication(address, port, if_index, af);
1396
if(ret < 0){
1397
exitcode = EXIT_FAILURE;
1398
} else {
2110
1399
exitcode = EXIT_SUCCESS;
2111
1400
}
2112
2113
1401
goto end;
2114
1402
}
2115
1403
2137
1425
2138
1426
/* Check if creating the Avahi server object succeeded */
2139
1427
if(mc.server == NULL){
2140
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2141
avahi_strerror(error));
2142
exitcode = EX_UNAVAILABLE;
1428
fprintf(stderr, "Failed to create Avahi server: %s\n",
1429
avahi_strerror(error));
1430
exitcode = EXIT_FAILURE;
2143
1431
goto end;
2144
1432
}
2145
1433
2152
1440
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2153
1441
NULL, 0, browse_callback, NULL);
2154
1442
if(sb == NULL){
2155
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2156
avahi_strerror(avahi_server_errno(mc.server)));
2157
exitcode = EX_UNAVAILABLE;
1443
fprintf(stderr, "Failed to create service browser: %s\n",
1444
avahi_strerror(avahi_server_errno(mc.server)));
1445
exitcode = EXIT_FAILURE;
2158
1446
goto end;
2159
1447
}
2160
1448
2165
1453
/* Run the main loop */
2166
1454
2167
1455
if(debug){
2168
fprintf_plus(stderr, "Starting Avahi loop search\n");
2169
}
2170
2171
ret = avahi_loop_with_timeout(mc.simple_poll,
2172
(int)(retry_interval * 1000));
2173
if(debug){
2174
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2175
(ret == 0) ? "successfully" : "with error");
2176
}
1456
fprintf(stderr, "Starting Avahi loop search\n");
1457
}
1458
1459
avahi_simple_poll_loop(mc.simple_poll);
2177
1460
2178
1461
end:
2179
1462
2180
1463
if(debug){
2181
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1464
fprintf(stderr, "%s exiting\n", argv[0]);
2182
1465
}
2183
1466
2184
1467
/* Cleanup things */
2200
1483
if(gpgme_initialized){
2201
1484
gpgme_release(mc.ctx);
2202
1485
}
2203
2204
/* Cleans up the circular linked list of Mandos servers the client
2205
has seen */
2206
if(mc.current_server != NULL){
2207
mc.current_server->prev->next = NULL;
2208
while(mc.current_server != NULL){
2209
server *next = mc.current_server->next;
2210
free(mc.current_server);
2211
mc.current_server = next;
2212
}
2213
}
2214
1486
2215
/* Re-raise priviliges */
2216
{
2217
if(getuid() == 0){
2218
errno = 0;
2219
ret = seteuid(0);
2220
if(ret == -1){
2221
perror_plus("seteuid");
2222
}
2223
}
2224
/* Run network hooks */
2225
if(not run_network_hooks("stop", interface, delay)){
2226
goto end;
2227
}
2228
2229
/* Take down the network interface */
2230
if(take_down_interface and geteuid() == 0){
1487
/* Take down the network interface */
1488
if(take_down_interface){
1489
/* Re-raise priviliges */
1490
errno = 0;
1491
ret = seteuid(0);
1492
if(ret == -1){
1493
perror("seteuid");
1494
}
1495
if(geteuid() == 0){
2231
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2232
1497
if(ret == -1){
2233
perror_plus("ioctl SIOCGIFFLAGS");
2234
} else if(network.ifr_flags & IFF_UP){
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_UP) {
1500
network.ifr_flags &= ~IFF_UP; /* clear flag */
2236
1501
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2237
1502
if(ret == -1){
2238
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1503
perror("ioctl SIOCSIFFLAGS");
2239
1504
}
2240
1505
}
2241
1506
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2242
1507
if(ret == -1){
2243
perror_plus("close");
2244
}
2245
}
2246
}
2247
if(getuid() == 0){
2248
/* Lower privileges permanently */
2249
errno = 0;
2250
ret = setuid(uid);
2251
if(ret == -1){
2252
perror_plus("setuid");
1508
perror("close");
1509
}
1510
/* Lower privileges, permanently this time */
1511
errno = 0;
1512
ret = setuid(uid);
1513
if(ret == -1){
1514
perror("setuid");
1515
}
2253
1516
}
2254
1517
}
2255
1518
2256
/* Removes the GPGME temp directory and all files inside */
1519
/* Removes the temp directory used by GPGME */
2257
1520
if(tempdir_created){
2258
struct dirent **direntries = NULL;
2259
struct dirent *direntry = NULL;
2260
int numentries = scandir(tempdir, &direntries, notdotentries,
2261
alphasort);
2262
if (numentries > 0){
2263
for(int i = 0; i < numentries; i++){
2264
direntry = direntries[i];
1521
DIR *d;
1522
struct dirent *direntry;
1523
d = opendir(tempdir);
1524
if(d == NULL){
1525
if(errno != ENOENT){
1526
perror("opendir");
1527
}
1528
} else {
1529
while(true){
1530
direntry = readdir(d);
1531
if(direntry == NULL){
1532
break;
1533
}
1534
/* Skip "." and ".." */
1535
if(direntry->d_name[0] == '.'
1536
and (direntry->d_name[1] == '\0'
1537
or (direntry->d_name[1] == '.'
1538
and direntry->d_name[2] == '\0'))){
1539
continue;
1540
}
2265
1541
char *fullname = NULL;
2266
1542
ret = asprintf(&fullname, "%s/%s", tempdir,
2267
1543
direntry->d_name);
2268
1544
if(ret < 0){
2269
perror_plus("asprintf");
1545
perror("asprintf");
2270
1546
continue;
2271
1547
}
2272
1548
ret = remove(fullname);
2273
1549
if(ret == -1){
2274
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2275
strerror(errno));
1550
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1551
strerror(errno));
2276
1552
}
2277
1553
free(fullname);
2278
1554
}
2279
}
2280
2281
/* need to clean even if 0 because man page doesn't specify */
2282
free(direntries);
2283
if (numentries == -1){
2284
perror_plus("scandir");
1555
closedir(d);
2285
1556
}
2286
1557
ret = rmdir(tempdir);
2287
1558
if(ret == -1 and errno != ENOENT){
2288
perror_plus("rmdir");
1559
perror("rmdir");
2289
1560
}
2290
1561
}
2291
1562
2292
1563
if(quit_now){
2293
1564
sigemptyset(&old_sigterm_action.sa_mask);
2294
1565
old_sigterm_action.sa_handler = SIG_DFL;
2295
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2296
&old_sigterm_action,
2297
NULL));
1566
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2298
1567
if(ret == -1){
2299
perror_plus("sigaction");
2300
}
2301
do {
2302
ret = raise(signal_received);
2303
} while(ret != 0 and errno == EINTR);
2304
if(ret != 0){
2305
perror_plus("raise");
2306
abort();
2307
}
2308
TEMP_FAILURE_RETRY(pause());
1568
perror("sigaction");
1569
}
1570
raise(signal_received);
2309
1571
}
2310
1572
2311
1573
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0