To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 310
- compare with another revision
- download diff
- download tarball
- view history from revision 310
- Committer: Teddy Hogeborn
- Date: 2009-02-12 06:09:24 UTC
- Revision ID: teddy@fukt.bsnet.se-20090212060924-vwxgitxnwr14w9e4
* mandos (Client.start_checker): Bug fix: Add extra check in case the
checker process completed quickly.
checker process completed quickly.
- 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() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
48
45
#include <stdbool.h> /* bool, false, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
53
50
sockaddr_in6, PF_INET6,
54
51
SOCK_STREAM, uid_t, gid_t, open(),
55
52
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
53
#include <sys/stat.h> /* open() */
57
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
55
inet_pton(), connect() */
59
56
#include <fcntl.h> /* open() */
60
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
58
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
60
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
68
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
64
SIOCSIFFLAGS, if_indextoname(),
70
65
if_nametoindex(), IF_NAMESIZE */
72
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
68
*/
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
78
73
#include <iso646.h> /* not, or, and */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
78
#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() */
90
#include <grp.h> /* setgroups() */
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
91
81
92
82
#ifdef __linux__
93
83
#include <sys/klog.h> /* klogctl() */
111
101
init_gnutls_session(),
112
102
GNUTLS_* */
113
103
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
104
/* gnutls_certificate_set_openpgp_key_file(),
105
GNUTLS_OPENPGP_FMT_BASE64 */
116
106
117
107
/* GPGME */
118
108
#include <gpgme.h> /* All GPGME types, constants and
126
116
#define PATHDIR "/conf/conf.d/mandos"
127
117
#define SECKEY "seckey.txt"
128
118
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
119
131
120
bool debug = false;
132
121
static const char mandos_protocol_version[] = "1";
133
122
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
124
150
125
/* Used for passing in values through the Avahi callback functions */
151
126
typedef struct {
156
131
gnutls_dh_params_t dh_params;
157
132
const char *priority;
158
133
gpgme_ctx_t ctx;
159
server *current_server;
160
134
} mandos_context;
161
135
162
136
/* global context so signal handler can reach it*/
163
137
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
138
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
167
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
186
140
187
141
/*
188
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
190
144
* "buffer_length" is how much is already used.
191
145
*/
192
146
size_t incbuffer(char **buffer, size_t buffer_length,
193
size_t buffer_capacity){
147
size_t buffer_capacity){
194
148
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
149
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
150
if(buffer == NULL){
201
155
return buffer_capacity;
202
156
}
203
157
204
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
207
int ret;
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
211
return -1;
212
}
213
*new_server = (server){ .ip = strdup(ip),
214
.port = port,
215
.if_index = if_index,
216
.af = af };
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
219
return -1;
220
}
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
227
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
239
}
240
241
158
/*
242
159
* Initialize GPGME.
243
160
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
161
static bool init_gpgme(const char *seckey,
162
const char *pubkey, const char *tempdir){
163
int ret;
246
164
gpgme_error_t rc;
247
165
gpgme_engine_info_t engine_info;
248
166
251
169
* Helper function to insert pub and seckey to the engine keyring.
252
170
*/
253
171
bool import_key(const char *filename){
254
int ret;
255
172
int fd;
256
173
gpgme_data_t pgp_data;
257
174
258
175
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
259
176
if(fd == -1){
260
perror_plus("open");
177
perror("open");
261
178
return false;
262
179
}
263
180
264
181
rc = gpgme_data_new_from_fd(&pgp_data, fd);
265
182
if(rc != GPG_ERR_NO_ERROR){
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
184
gpgme_strsource(rc), gpgme_strerror(rc));
268
185
return false;
269
186
}
270
187
271
188
rc = gpgme_op_import(mc.ctx, pgp_data);
272
189
if(rc != GPG_ERR_NO_ERROR){
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
275
192
return false;
276
193
}
277
194
278
195
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
196
if(ret == -1){
280
perror_plus("close");
197
perror("close");
281
198
}
282
199
gpgme_data_release(pgp_data);
283
200
return true;
284
201
}
285
202
286
203
if(debug){
287
fprintf_plus(stderr, "Initializing GPGME\n");
204
fprintf(stderr, "Initializing GPGME\n");
288
205
}
289
206
290
207
/* Init GPGME */
291
208
gpgme_check_version(NULL);
292
209
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
293
210
if(rc != GPG_ERR_NO_ERROR){
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
212
gpgme_strsource(rc), gpgme_strerror(rc));
296
213
return false;
297
214
}
298
215
299
/* Set GPGME home directory for the OpenPGP engine only */
216
/* Set GPGME home directory for the OpenPGP engine only */
300
217
rc = gpgme_get_engine_info(&engine_info);
301
218
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
304
221
return false;
305
222
}
306
223
while(engine_info != NULL){
312
229
engine_info = engine_info->next;
313
230
}
314
231
if(engine_info == NULL){
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
317
233
return false;
318
234
}
319
235
320
236
/* Create new GPGME "context" */
321
237
rc = gpgme_new(&(mc.ctx));
322
238
if(rc != GPG_ERR_NO_ERROR){
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
326
241
return false;
327
242
}
328
243
330
245
return false;
331
246
}
332
247
333
return true;
248
return true;
334
249
}
335
250
336
251
/*
347
262
ssize_t plaintext_length = 0;
348
263
349
264
if(debug){
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
351
266
}
352
267
353
268
/* Create new GPGME data buffer from memory cryptotext */
354
269
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
355
270
0);
356
271
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
359
274
return -1;
360
275
}
361
276
362
277
/* Create new empty GPGME data buffer for the plaintext */
363
278
rc = gpgme_data_new(&dh_plain);
364
279
if(rc != GPG_ERR_NO_ERROR){
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
368
282
gpgme_data_release(dh_crypto);
369
283
return -1;
370
284
}
373
287
data buffer */
374
288
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
375
289
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
378
292
plaintext_length = -1;
379
293
if(debug){
380
294
gpgme_decrypt_result_t result;
381
295
result = gpgme_op_decrypt_result(mc.ctx);
382
296
if(result == NULL){
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
298
} else {
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
299
fprintf(stderr, "Unsupported algorithm: %s\n",
300
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
302
result->wrong_key_usage);
389
303
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
304
fprintf(stderr, "File name: %s\n", result->file_name);
391
305
}
392
306
gpgme_recipient_t recipient;
393
307
recipient = result->recipients;
394
while(recipient != NULL){
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
402
recipient = recipient->next;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
403
318
}
404
319
}
405
320
}
407
322
}
408
323
409
324
if(debug){
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
326
}
412
327
413
328
/* Seek back to the beginning of the GPGME plaintext data buffer */
414
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
415
perror_plus("gpgme_data_seek");
330
perror("gpgme_data_seek");
416
331
plaintext_length = -1;
417
332
goto decrypt_end;
418
333
}
420
335
*plaintext = NULL;
421
336
while(true){
422
337
plaintext_capacity = incbuffer(plaintext,
423
(size_t)plaintext_length,
424
plaintext_capacity);
338
(size_t)plaintext_length,
339
plaintext_capacity);
425
340
if(plaintext_capacity == 0){
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
341
perror("incbuffer");
342
plaintext_length = -1;
343
goto decrypt_end;
429
344
}
430
345
431
346
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
436
351
break;
437
352
}
438
353
if(ret < 0){
439
perror_plus("gpgme_data_read");
354
perror("gpgme_data_read");
440
355
plaintext_length = -1;
441
356
goto decrypt_end;
442
357
}
444
359
}
445
360
446
361
if(debug){
447
fprintf_plus(stderr, "Decrypted password is: ");
362
fprintf(stderr, "Decrypted password is: ");
448
363
for(ssize_t i = 0; i < plaintext_length; i++){
449
364
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
450
365
}
472
387
/* GnuTLS log function callback */
473
388
static void debuggnutls(__attribute__((unused)) int level,
474
389
const char* string){
475
fprintf_plus(stderr, "GnuTLS: %s", string);
390
fprintf(stderr, "GnuTLS: %s", string);
476
391
}
477
392
478
393
static int init_gnutls_global(const char *pubkeyfilename,
480
395
int ret;
481
396
482
397
if(debug){
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
398
fprintf(stderr, "Initializing GnuTLS\n");
484
399
}
485
400
486
401
ret = gnutls_global_init();
487
402
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
490
405
return -1;
491
406
}
492
407
499
414
}
500
415
501
416
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
417
gnutls_certificate_allocate_credentials(&mc.cred);
503
418
if(ret != GNUTLS_E_SUCCESS){
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
506
424
gnutls_global_deinit();
507
425
return -1;
508
426
}
509
427
510
428
if(debug){
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
431
seckeyfilename);
515
432
}
516
433
517
434
ret = gnutls_certificate_set_openpgp_key_file
518
435
(mc.cred, pubkeyfilename, seckeyfilename,
519
436
GNUTLS_OPENPGP_FMT_BASE64);
520
437
if(ret != GNUTLS_E_SUCCESS){
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
438
fprintf(stderr,
439
"Error[%d] while reading the OpenPGP key pair ('%s',"
440
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
441
fprintf(stderr, "The GnuTLS error is: %s\n",
442
safer_gnutls_strerror(ret));
526
443
goto globalfail;
527
444
}
528
445
529
446
/* GnuTLS server initialization */
530
447
ret = gnutls_dh_params_init(&mc.dh_params);
531
448
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
450
" %s\n", safer_gnutls_strerror(ret));
535
451
goto globalfail;
536
452
}
537
453
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
454
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
456
safer_gnutls_strerror(ret));
541
457
goto globalfail;
542
458
}
543
459
556
472
static int init_gnutls_session(gnutls_session_t *session){
557
473
int ret;
558
474
/* GnuTLS session creation */
559
do {
560
ret = gnutls_init(session, GNUTLS_SERVER);
561
if(quit_now){
562
return -1;
563
}
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
475
ret = gnutls_init(session, GNUTLS_SERVER);
565
476
if(ret != GNUTLS_E_SUCCESS){
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
478
safer_gnutls_strerror(ret));
569
479
}
570
480
571
481
{
572
482
const char *err;
573
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
575
if(quit_now){
576
gnutls_deinit(*session);
577
return -1;
578
}
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
484
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
584
488
gnutls_deinit(*session);
585
489
return -1;
586
490
}
587
491
}
588
492
589
do {
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
592
if(quit_now){
593
gnutls_deinit(*session);
594
return -1;
595
}
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
597
495
if(ret != GNUTLS_E_SUCCESS){
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
497
safer_gnutls_strerror(ret));
600
498
gnutls_deinit(*session);
601
499
return -1;
602
500
}
603
501
604
502
/* ignore client certificate if any. */
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
606
505
607
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
608
507
617
516
static int start_mandos_communication(const char *ip, uint16_t port,
618
517
AvahiIfIndex if_index,
619
518
int af){
620
int ret, tcp_sd = -1;
519
int ret, tcp_sd;
621
520
ssize_t sret;
622
521
union {
623
522
struct sockaddr_in in;
624
523
struct sockaddr_in6 in6;
625
524
} to;
626
525
char *buffer = NULL;
627
char *decrypted_buffer = NULL;
526
char *decrypted_buffer;
628
527
size_t buffer_length = 0;
629
528
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
630
530
size_t written;
631
int retval = -1;
531
int retval = 0;
632
532
gnutls_session_t session;
633
533
int pf; /* Protocol family */
634
534
635
errno = 0;
636
637
if(quit_now){
638
errno = EINTR;
639
return -1;
640
}
641
642
535
switch(af){
643
536
case AF_INET6:
644
537
pf = PF_INET6;
647
540
pf = PF_INET;
648
541
break;
649
542
default:
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
651
errno = EINVAL;
543
fprintf(stderr, "Bad address family: %d\n", af);
652
544
return -1;
653
545
}
654
546
658
550
}
659
551
660
552
if(debug){
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
554
"\n", ip, port);
663
555
}
664
556
665
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
666
558
if(tcp_sd < 0){
667
int e = errno;
668
perror_plus("socket");
669
errno = e;
670
goto mandos_end;
671
}
672
673
if(quit_now){
674
errno = EINTR;
675
goto mandos_end;
559
perror("socket");
560
return -1;
676
561
}
677
562
678
563
memset(&to, 0, sizeof(to));
679
564
if(af == AF_INET6){
680
to.in6.sin6_family = (sa_family_t)af;
565
to.in6.sin6_family = (uint16_t)af;
681
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
682
567
} else { /* IPv4 */
683
568
to.in.sin_family = (sa_family_t)af;
684
569
ret = inet_pton(af, ip, &to.in.sin_addr);
685
570
}
686
571
if(ret < 0 ){
687
int e = errno;
688
perror_plus("inet_pton");
689
errno = e;
690
goto mandos_end;
572
perror("inet_pton");
573
return -1;
691
574
}
692
575
if(ret == 0){
693
int e = errno;
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
695
errno = e;
696
goto mandos_end;
576
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
697
578
}
698
579
if(af == AF_INET6){
699
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
702
583
703
584
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
585
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
586
-Wunreachable-code*/
706
587
if(if_index == AVAHI_IF_UNSPEC){
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
709
errno = EINVAL;
710
goto mandos_end;
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
" without a network interface\n");
590
return -1;
711
591
}
712
592
/* Set the network interface number as scope */
713
593
to.in6.sin6_scope_id = (uint32_t)if_index;
718
598
-Wunreachable-code */
719
599
}
720
600
721
if(quit_now){
722
errno = EINTR;
723
goto mandos_end;
724
}
725
726
601
if(debug){
727
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
728
603
char interface[IF_NAMESIZE];
729
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
perror_plus("if_indextoname");
605
perror("if_indextoname");
731
606
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
608
ip, interface, port);
734
609
}
735
610
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
738
613
}
739
614
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
615
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
747
622
sizeof(addrstr));
748
623
}
749
624
if(pcret == NULL){
750
perror_plus("inet_ntop");
625
perror("inet_ntop");
751
626
} else {
752
627
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
629
}
755
630
}
756
631
}
757
632
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
633
if(af == AF_INET6){
764
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
635
} else {
766
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
637
}
768
638
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
goto mandos_end;
639
perror("connect");
640
return -1;
780
641
}
781
642
782
643
const char *out = mandos_protocol_version;
784
645
while(true){
785
646
size_t out_size = strlen(out);
786
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
787
out_size - written));
648
out_size - written));
788
649
if(ret == -1){
789
int e = errno;
790
perror_plus("write");
791
errno = e;
650
perror("write");
651
retval = -1;
792
652
goto mandos_end;
793
653
}
794
654
written += (size_t)ret;
802
662
break;
803
663
}
804
664
}
805
806
if(quit_now){
807
errno = EINTR;
808
goto mandos_end;
809
}
810
665
}
811
666
812
667
if(debug){
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
814
}
815
816
if(quit_now){
817
errno = EINTR;
818
goto mandos_end;
819
}
820
821
/* Spurious warning from -Wint-to-pointer-cast */
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
}
670
822
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
823
672
824
if(quit_now){
825
errno = EINTR;
826
goto mandos_end;
827
}
828
829
do {
673
do{
830
674
ret = gnutls_handshake(session);
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
834
}
835
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
836
676
837
677
if(ret != GNUTLS_E_SUCCESS){
838
678
if(debug){
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
840
680
gnutls_perror(ret);
841
681
}
842
errno = EPROTO;
682
retval = -1;
843
683
goto mandos_end;
844
684
}
845
685
846
686
/* Read OpenPGP packet that contains the wanted password */
847
687
848
688
if(debug){
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
690
ip);
851
691
}
852
692
853
693
while(true){
854
855
if(quit_now){
856
errno = EINTR;
857
goto mandos_end;
858
}
859
860
694
buffer_capacity = incbuffer(&buffer, buffer_length,
861
buffer_capacity);
695
buffer_capacity);
862
696
if(buffer_capacity == 0){
863
int e = errno;
864
perror_plus("incbuffer");
865
errno = e;
866
goto mandos_end;
867
}
868
869
if(quit_now){
870
errno = EINTR;
697
perror("incbuffer");
698
retval = -1;
871
699
goto mandos_end;
872
700
}
873
701
882
710
case GNUTLS_E_AGAIN:
883
711
break;
884
712
case GNUTLS_E_REHANDSHAKE:
885
do {
713
do{
886
714
ret = gnutls_handshake(session);
887
888
if(quit_now){
889
errno = EINTR;
890
goto mandos_end;
891
}
892
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
893
716
if(ret < 0){
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
896
718
gnutls_perror(ret);
897
errno = EPROTO;
719
retval = -1;
898
720
goto mandos_end;
899
721
}
900
722
break;
901
723
default:
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
724
fprintf(stderr, "Unknown error while reading data from"
725
" encrypted session with Mandos server\n");
726
retval = -1;
904
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
905
errno = EIO;
906
728
goto mandos_end;
907
729
}
908
730
} else {
911
733
}
912
734
913
735
if(debug){
914
fprintf_plus(stderr, "Closing TLS session\n");
915
}
916
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
do {
923
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
736
fprintf(stderr, "Closing TLS session\n");
737
}
738
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
929
740
930
741
if(buffer_length > 0){
931
ssize_t decrypted_buffer_size;
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
buffer_length,
933
744
&decrypted_buffer);
934
745
if(decrypted_buffer_size >= 0){
935
936
746
written = 0;
937
747
while(written < (size_t) decrypted_buffer_size){
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
748
ret = (int)fwrite(decrypted_buffer + written, 1,
944
749
(size_t)decrypted_buffer_size - written,
945
750
stdout);
946
751
if(ret == 0 and ferror(stdout)){
947
int e = errno;
948
752
if(debug){
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
753
fprintf(stderr, "Error writing encrypted data: %s\n",
754
strerror(errno));
951
755
}
952
errno = e;
953
goto mandos_end;
756
retval = -1;
757
break;
954
758
}
955
759
written += (size_t)ret;
956
760
}
957
retval = 0;
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
958
764
}
765
} else {
766
retval = -1;
959
767
}
960
768
961
769
/* Shutdown procedure */
962
770
963
771
mandos_end:
964
{
965
int e = errno;
966
free(decrypted_buffer);
967
free(buffer);
968
if(tcp_sd >= 0){
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
970
}
971
if(ret == -1){
972
if(e == 0){
973
e = errno;
974
}
975
perror_plus("close");
976
}
977
gnutls_deinit(session);
978
errno = e;
979
if(quit_now){
980
errno = EINTR;
981
retval = -1;
982
}
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
983
776
}
777
gnutls_deinit(session);
984
778
return retval;
985
779
}
986
780
1003
797
/* Called whenever a service has been resolved successfully or
1004
798
timed out */
1005
799
1006
if(quit_now){
1007
return;
1008
}
1009
1010
800
switch(event){
1011
801
default:
1012
802
case AVAHI_RESOLVER_FAILURE:
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
803
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
804
" of type '%s' in domain '%s': %s\n", name, type, domain,
805
avahi_strerror(avahi_server_errno(mc.server)));
1017
806
break;
1018
807
1019
808
case AVAHI_RESOLVER_FOUND:
1021
810
char ip[AVAHI_ADDRESS_STR_MAX];
1022
811
avahi_address_snprint(ip, sizeof(ip), address);
1023
812
if(debug){
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
814
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
ip, (intmax_t)interface, port);
1027
816
}
1028
817
int ret = start_mandos_communication(ip, port, interface,
1029
818
avahi_proto_to_af(proto));
1030
819
if(ret == 0){
1031
820
avahi_simple_poll_quit(mc.simple_poll);
1032
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1035
821
}
1036
822
}
1037
823
}
1053
839
/* Called whenever a new services becomes available on the LAN or
1054
840
is removed from the LAN */
1055
841
1056
if(quit_now){
1057
return;
1058
}
1059
1060
842
switch(event){
1061
843
default:
1062
844
case AVAHI_BROWSER_FAILURE:
1063
845
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
846
fprintf(stderr, "(Avahi browser) %s\n",
847
avahi_strerror(avahi_server_errno(mc.server)));
1066
848
avahi_simple_poll_quit(mc.simple_poll);
1067
849
return;
1068
850
1072
854
the callback function is called the Avahi server will free the
1073
855
resolver for us. */
1074
856
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
857
if(!(avahi_s_service_resolver_new(mc.server, interface,
858
protocol, name, type, domain,
859
AVAHI_PROTO_INET6, 0,
860
resolve_callback, NULL)))
861
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
862
name, avahi_strerror(avahi_server_errno(mc.server)));
1081
863
break;
1082
864
1083
865
case AVAHI_BROWSER_REMOVE:
1086
868
case AVAHI_BROWSER_ALL_FOR_NOW:
1087
869
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1088
870
if(debug){
1089
fprintf_plus(stderr, "No Mandos server found, still"
1090
" searching...\n");
871
fprintf(stderr, "No Mandos server found, still searching...\n");
1091
872
}
1092
873
break;
1093
874
}
1094
875
}
1095
876
1096
/* Signal handler that stops main loop after SIGTERM */
1097
static void handle_sigterm(int sig){
877
sig_atomic_t quit_now = 0;
878
879
/* stop main loop after sigterm has been called */
880
static void handle_sigterm(__attribute__((unused)) int sig){
1098
881
if(quit_now){
1099
882
return;
1100
883
}
1101
884
quit_now = 1;
1102
signal_received = sig;
1103
885
int old_errno = errno;
1104
/* set main loop to exit */
1105
886
if(mc.simple_poll != NULL){
1106
887
avahi_simple_poll_quit(mc.simple_poll);
1107
888
}
1108
889
errno = old_errno;
1109
890
}
1110
891
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
int ret;
1113
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
if(s < 0){
1116
perror_plus("socket");
1117
return false;
1118
}
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
if(ret == -1){
1122
if(debug){
1123
perror_plus("ioctl SIOCGIFFLAGS");
1124
}
1125
return false;
1126
}
1127
return true;
1128
}
1129
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1132
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1134
if(debug){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1136
ifname);
1137
}
1138
return false;
1139
}
1140
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1142
if(debug){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1145
}
1146
return true;
1147
}
1148
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1150
if(debug){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1153
}
1154
return false;
1155
}
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1158
if(debug){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1160
ifname);
1161
}
1162
return false;
1163
}
1164
1165
/* Accept this device */
1166
if(debug){
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1168
}
1169
return true;
1170
}
1171
1172
/*
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1176
*/
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1179
return 0;
1180
}
1181
1182
struct ifreq ifr;
1183
if(not get_flags(if_entry->d_name, &ifr)){
1184
if(debug){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1187
}
1188
return 0;
1189
}
1190
1191
if(not good_flags(if_entry->d_name, &ifr)){
1192
return 0;
1193
}
1194
return 1;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1253
int ret;
1254
size_t sret;
1255
struct stat st;
1256
1257
if((direntry->d_name)[0] == '\0'){
1258
/* Empty name? */
1259
return 0;
1260
}
1261
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1264
"0123456789"
1265
"_-");
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1268
if(debug){
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1270
direntry->d_name);
1271
}
1272
return 0;
1273
}
1274
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1283
if(ret == -1){
1284
if(debug){
1285
perror_plus("Could not stat hook");
1286
}
1287
return 0;
1288
}
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1291
if(debug){
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1293
direntry->d_name);
1294
}
1295
return 0;
1296
}
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1299
if(debug){
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1301
direntry->d_name);
1302
}
1303
return 0;
1304
}
1305
if(debug){
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1307
direntry->d_name);
1308
}
1309
return 1;
1310
}
1311
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1313
int ret;
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1317
1318
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1321
fprintf_plus(stderr, "Wait until first server is found."
1322
" No timeout!\n");
1323
}
1324
ret = avahi_simple_poll_iterate(s, -1);
1325
} else {
1326
if (debug){
1327
fprintf_plus(stderr, "Check current_server if we should run"
1328
" it, or wait\n");
1329
}
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1332
if(ret == -1){
1333
perror_plus("clock_gettime");
1334
return -1;
1335
}
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1349
if (debug){
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
block_time);
1352
}
1353
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1359
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1361
return 0;
1362
}
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1365
if(ret == -1){
1366
perror_plus("clock_gettime");
1367
return -1;
1368
}
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1372
}
1373
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
}
1376
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1379
}
1380
}
1381
}
1382
}
1383
1384
bool run_network_hooks(const char *mode, const char *interface,
1385
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1391
if(numhooks == -1){
1392
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1400
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1438
if(ret == -1){
1439
perror_plus("setenv");
1440
_exit(EX_OSERR);
1441
}
1442
ret = setenv("DEVICE", interface, 1);
1443
if(ret == -1){
1444
perror_plus("setenv");
1445
_exit(EX_OSERR);
1446
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1448
if(ret == -1){
1449
perror_plus("setenv");
1450
_exit(EX_OSERR);
1451
}
1452
ret = setenv("MODE", mode, 1);
1453
if(ret == -1){
1454
perror_plus("setenv");
1455
_exit(EX_OSERR);
1456
}
1457
char *delaystring;
1458
ret = asprintf(&delaystring, "%f", delay);
1459
if(ret == -1){
1460
perror_plus("asprintf");
1461
_exit(EX_OSERR);
1462
}
1463
ret = setenv("DELAY", delaystring, 1);
1464
if(ret == -1){
1465
free(delaystring);
1466
perror_plus("setenv");
1467
_exit(EX_OSERR);
1468
}
1469
free(delaystring);
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1472
} else {
1473
int status;
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1476
free(fullname);
1477
continue;
1478
}
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1484
free(fullname);
1485
continue;
1486
}
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1490
WTERMSIG(status));
1491
free(fullname);
1492
continue;
1493
} else {
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1496
free(fullname);
1497
continue;
1498
}
1499
}
1500
free(fullname);
1501
if(debug){
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1503
direntry->d_name);
1504
}
1505
}
1506
close(devnull);
1507
}
1508
return true;
1509
}
1510
1511
892
int main(int argc, char *argv[]){
1512
893
AvahiSServiceBrowser *sb = NULL;
1513
894
int error;
1514
895
int ret;
1515
896
intmax_t tmpmax;
1516
char *tmp;
897
int numchars;
1517
898
int exitcode = EXIT_SUCCESS;
1518
const char *interface = "";
899
const char *interface = "eth0";
1519
900
struct ifreq network;
1520
int sd = -1;
1521
bool take_down_interface = false;
901
int sd;
1522
902
uid_t uid;
1523
903
gid_t gid;
904
char *connect_to = NULL;
1524
905
char tempdir[] = "/tmp/mandosXXXXXX";
1525
906
bool tempdir_created = false;
1526
907
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1527
908
const char *seckey = PATHDIR "/" SECKEY;
1528
909
const char *pubkey = PATHDIR "/" PUBKEY;
1529
910
911
/* Initialize Mandos context */
912
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
913
.dh_bits = 1024, .priority = "SECURE256"
914
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1530
915
bool gnutls_initialized = false;
1531
916
bool gpgme_initialized = false;
1532
float delay = 2.5f;
1533
double retry_interval = 10; /* 10s between trying a server and
1534
retrying the same server again */
1535
1536
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
917
double delay = 2.5;
918
919
struct sigaction old_sigterm_action;
1537
920
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1538
921
1539
uid = getuid();
1540
gid = getgid();
1541
1542
/* Lower any group privileges we might have, just to be safe */
1543
errno = 0;
1544
ret = setgid(gid);
1545
if(ret == -1){
1546
perror_plus("setgid");
1547
}
1548
1549
/* Lower user privileges (temporarily) */
1550
errno = 0;
1551
ret = seteuid(uid);
1552
if(ret == -1){
1553
perror_plus("seteuid");
1554
}
1555
1556
if(quit_now){
1557
goto end;
1558
}
1559
1560
922
{
1561
923
struct argp_option options[] = {
1562
924
{ .name = "debug", .key = 128,
1591
953
.arg = "SECONDS",
1592
954
.doc = "Maximum delay to wait for interface startup",
1593
955
.group = 2 },
1594
{ .name = "retry", .key = 132,
1595
.arg = "SECONDS",
1596
.doc = "Retry interval used when denied by the mandos server",
1597
.group = 2 },
1598
{ .name = "network-hook-dir", .key = 133,
1599
.arg = "DIR",
1600
.doc = "Directory where network hooks are located",
1601
.group = 2 },
1602
/*
1603
* These reproduce what we would get without ARGP_NO_HELP
1604
*/
1605
{ .name = "help", .key = '?',
1606
.doc = "Give this help list", .group = -1 },
1607
{ .name = "usage", .key = -3,
1608
.doc = "Give a short usage message", .group = -1 },
1609
{ .name = "version", .key = 'V',
1610
.doc = "Print program version", .group = -1 },
1611
956
{ .name = NULL }
1612
957
};
1613
958
1614
959
error_t parse_opt(int key, char *arg,
1615
960
struct argp_state *state){
1616
errno = 0;
1617
961
switch(key){
1618
962
case 128: /* --debug */
1619
963
debug = true;
1631
975
pubkey = arg;
1632
976
break;
1633
977
case 129: /* --dh-bits */
1634
errno = 0;
1635
tmpmax = strtoimax(arg, &tmp, 10);
1636
if(errno != 0 or tmp == arg or *tmp != '\0'
1637
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1638
argp_error(state, "Bad number of DH bits");
978
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
979
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
980
or arg[numchars] != '\0'){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1639
983
}
1640
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1641
985
break;
1643
987
mc.priority = arg;
1644
988
break;
1645
989
case 131: /* --delay */
1646
errno = 0;
1647
delay = strtof(arg, &tmp);
1648
if(errno != 0 or tmp == arg or *tmp != '\0'){
1649
argp_error(state, "Bad delay");
1650
}
1651
case 132: /* --retry */
1652
errno = 0;
1653
retry_interval = strtod(arg, &tmp);
1654
if(errno != 0 or tmp == arg or *tmp != '\0'
1655
or (retry_interval * 1000) > INT_MAX
1656
or retry_interval < 0){
1657
argp_error(state, "Bad retry interval");
1658
}
1659
break;
1660
case 133: /* --network-hook-dir */
1661
hookdir = arg;
1662
break;
1663
/*
1664
* These reproduce what we would get without ARGP_NO_HELP
1665
*/
1666
case '?': /* --help */
1667
argp_state_help(state, state->out_stream,
1668
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1669
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1670
case -3: /* --usage */
1671
argp_state_help(state, state->out_stream,
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1673
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1677
exit(argp_err_exit_status);
990
ret = sscanf(arg, "%lf%n", &delay, &numchars);
991
if(ret < 1 or arg[numchars] != '\0'){
992
fprintf(stderr, "Bad delay\n");
993
exit(EXIT_FAILURE);
994
}
995
break;
996
case ARGP_KEY_ARG:
997
argp_usage(state);
998
case ARGP_KEY_END:
1678
999
break;
1679
1000
default:
1680
1001
return ARGP_ERR_UNKNOWN;
1681
1002
}
1682
return errno;
1003
return 0;
1683
1004
}
1684
1005
1685
1006
struct argp argp = { .options = options, .parser = parse_opt,
1686
1007
.args_doc = "",
1687
1008
.doc = "Mandos client -- Get and decrypt"
1688
1009
" passwords from a Mandos server" };
1689
ret = argp_parse(&argp, argc, argv,
1690
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1691
switch(ret){
1692
case 0:
1693
break;
1694
case ENOMEM:
1695
default:
1696
errno = ret;
1697
perror_plus("argp_parse");
1698
exitcode = EX_OSERR;
1699
goto end;
1700
case EINVAL:
1701
exitcode = EX_USAGE;
1702
goto end;
1703
}
1704
}
1705
1706
{
1707
/* Work around Debian bug #633582:
1708
<http://bugs.debian.org/633582> */
1709
1710
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
1715
} else {
1716
struct stat st;
1717
1718
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1719
int seckey_fd = open(seckey, O_RDONLY);
1720
if(seckey_fd == -1){
1721
perror_plus("open");
1722
} else {
1723
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1724
if(ret == -1){
1725
perror_plus("fstat");
1726
} else {
1727
if(S_ISREG(st.st_mode)
1728
and st.st_uid == 0 and st.st_gid == 0){
1729
ret = fchown(seckey_fd, uid, gid);
1730
if(ret == -1){
1731
perror_plus("fchown");
1732
}
1733
}
1734
}
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
1736
}
1737
}
1738
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1740
int pubkey_fd = open(pubkey, O_RDONLY);
1741
if(pubkey_fd == -1){
1742
perror_plus("open");
1743
} else {
1744
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1745
if(ret == -1){
1746
perror_plus("fstat");
1747
} else {
1748
if(S_ISREG(st.st_mode)
1749
and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1751
if(ret == -1){
1752
perror_plus("fchown");
1753
}
1754
}
1755
}
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
1760
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
1765
}
1766
}
1767
}
1768
1769
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
1010
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1011
if(ret == ARGP_ERR_UNKNOWN){
1012
fprintf(stderr, "Unknown error while parsing arguments\n");
1013
exitcode = EXIT_FAILURE;
1014
goto end;
1015
}
1772
1016
}
1773
1017
1774
1018
if(not debug){
1775
1019
avahi_set_log_function(empty_log);
1776
1020
}
1777
1021
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1794
}
1795
if(interface == NULL){
1796
perror_plus("malloc");
1797
free(direntries);
1798
exitcode = EXIT_FAILURE;
1799
goto end;
1800
}
1801
free(direntries);
1802
} else {
1803
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1806
goto end;
1807
}
1808
}
1809
1810
1022
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1811
1023
from the signal handler */
1812
1024
/* Initialize the pseudo-RNG for Avahi */
1813
1025
srand((unsigned int) time(NULL));
1814
1026
mc.simple_poll = avahi_simple_poll_new();
1815
1027
if(mc.simple_poll == NULL){
1816
fprintf_plus(stderr,
1817
"Avahi: Failed to create simple poll object.\n");
1818
exitcode = EX_UNAVAILABLE;
1028
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1029
exitcode = EXIT_FAILURE;
1819
1030
goto end;
1820
1031
}
1821
1032
1822
1033
sigemptyset(&sigterm_action.sa_mask);
1823
1034
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1824
1035
if(ret == -1){
1825
perror_plus("sigaddset");
1826
exitcode = EX_OSERR;
1036
perror("sigaddset");
1037
exitcode = EXIT_FAILURE;
1827
1038
goto end;
1828
1039
}
1829
1040
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1830
1041
if(ret == -1){
1831
perror_plus("sigaddset");
1832
exitcode = EX_OSERR;
1042
perror("sigaddset");
1043
exitcode = EXIT_FAILURE;
1833
1044
goto end;
1834
1045
}
1835
1046
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1836
1047
if(ret == -1){
1837
perror_plus("sigaddset");
1838
exitcode = EX_OSERR;
1839
goto end;
1840
}
1841
/* Need to check if the handler is SIG_IGN before handling:
1842
| [[info:libc:Initial Signal Actions]] |
1843
| [[info:libc:Basic Signal Handling]] |
1844
*/
1845
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1846
if(ret == -1){
1847
perror_plus("sigaction");
1848
return EX_OSERR;
1849
}
1850
if(old_sigterm_action.sa_handler != SIG_IGN){
1851
ret = sigaction(SIGINT, &sigterm_action, NULL);
1852
if(ret == -1){
1853
perror_plus("sigaction");
1854
exitcode = EX_OSERR;
1855
goto end;
1856
}
1857
}
1858
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1859
if(ret == -1){
1860
perror_plus("sigaction");
1861
return EX_OSERR;
1862
}
1863
if(old_sigterm_action.sa_handler != SIG_IGN){
1864
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1865
if(ret == -1){
1866
perror_plus("sigaction");
1867
exitcode = EX_OSERR;
1868
goto end;
1869
}
1870
}
1871
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1872
if(ret == -1){
1873
perror_plus("sigaction");
1874
return EX_OSERR;
1875
}
1876
if(old_sigterm_action.sa_handler != SIG_IGN){
1877
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1878
if(ret == -1){
1879
perror_plus("sigaction");
1880
exitcode = EX_OSERR;
1881
goto end;
1882
}
1883
}
1048
perror("sigaddset");
1049
exitcode = EXIT_FAILURE;
1050
goto end;
1051
}
1052
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1884
1058
1885
1059
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1891
goto end;
1892
}
1893
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
/* Re-raise priviliges */
1899
errno = 0;
1900
ret = seteuid(0);
1901
if(ret == -1){
1902
perror_plus("seteuid");
1903
}
1904
1060
if(interface[0] != '\0'){
1905
1061
#ifdef __linux__
1906
1062
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1063
messages to mess up the prompt */
1908
1064
ret = klogctl(8, NULL, 5);
1909
1065
bool restore_loglevel = true;
1910
1066
if(ret == -1){
1911
1067
restore_loglevel = false;
1912
perror_plus("klogctl");
1068
perror("klogctl");
1913
1069
}
1914
1070
#endif /* __linux__ */
1915
1071
1916
1072
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
1073
if(sd < 0){
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1074
perror("socket");
1075
exitcode = EXIT_FAILURE;
1920
1076
#ifdef __linux__
1921
1077
if(restore_loglevel){
1922
1078
ret = klogctl(7, NULL, 0);
1923
1079
if(ret == -1){
1924
perror_plus("klogctl");
1080
perror("klogctl");
1925
1081
}
1926
1082
}
1927
1083
#endif /* __linux__ */
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
1084
goto end;
1935
1085
}
1936
1086
strcpy(network.ifr_name, interface);
1937
1087
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
1088
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1089
perror("ioctl SIOCGIFFLAGS");
1940
1090
#ifdef __linux__
1941
1091
if(restore_loglevel){
1942
1092
ret = klogctl(7, NULL, 0);
1943
1093
if(ret == -1){
1944
perror_plus("klogctl");
1094
perror("klogctl");
1945
1095
}
1946
1096
}
1947
1097
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1950
errno = 0;
1951
ret = seteuid(uid);
1952
if(ret == -1){
1953
perror_plus("seteuid");
1954
}
1098
exitcode = EXIT_FAILURE;
1955
1099
goto end;
1956
1100
}
1957
1101
if((network.ifr_flags & IFF_UP) == 0){
1958
1102
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
1103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
1104
if(ret == -1){
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1105
perror("ioctl SIOCSIFFLAGS");
1106
exitcode = EXIT_FAILURE;
1965
1107
#ifdef __linux__
1966
1108
if(restore_loglevel){
1967
1109
ret = klogctl(7, NULL, 0);
1968
1110
if(ret == -1){
1969
perror_plus("klogctl");
1111
perror("klogctl");
1970
1112
}
1971
1113
}
1972
1114
#endif /* __linux__ */
1973
/* Lower privileges */
1974
errno = 0;
1975
ret = seteuid(uid);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
1115
goto end;
1980
1116
}
1981
1117
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1118
/* sleep checking until interface is running */
1984
1119
for(int i=0; i < delay * 4; i++){
1985
1120
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
1121
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1122
perror("ioctl SIOCGIFFLAGS");
1988
1123
} else if(network.ifr_flags & IFF_RUNNING){
1989
1124
break;
1990
1125
}
1991
1126
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
1127
ret = nanosleep(&sleeptime, NULL);
1993
1128
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1129
perror("nanosleep");
1995
1130
}
1996
1131
}
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
if(ret == -1){
2001
perror_plus("close");
2002
}
1132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1133
if(ret == -1){
1134
perror("close");
2003
1135
}
2004
1136
#ifdef __linux__
2005
1137
if(restore_loglevel){
2006
1138
/* Restores kernel loglevel to default */
2007
1139
ret = klogctl(7, NULL, 0);
2008
1140
if(ret == -1){
2009
perror_plus("klogctl");
1141
perror("klogctl");
2010
1142
}
2011
1143
}
2012
1144
#endif /* __linux__ */
2013
/* Lower privileges */
2014
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
2019
}
2020
}
2021
2022
if(quit_now){
2023
goto end;
1145
}
1146
1147
uid = getuid();
1148
gid = getgid();
1149
1150
errno = 0;
1151
setgid(gid);
1152
if(ret == -1){
1153
perror("setgid");
1154
}
1155
1156
ret = setuid(uid);
1157
if(ret == -1){
1158
perror("setuid");
2024
1159
}
2025
1160
2026
1161
ret = init_gnutls_global(pubkey, seckey);
2027
1162
if(ret == -1){
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
2029
exitcode = EX_UNAVAILABLE;
1163
fprintf(stderr, "init_gnutls_global failed\n");
1164
exitcode = EXIT_FAILURE;
2030
1165
goto end;
2031
1166
} else {
2032
1167
gnutls_initialized = true;
2033
1168
}
2034
1169
2035
if(quit_now){
2036
goto end;
2037
}
2038
2039
1170
if(mkdtemp(tempdir) == NULL){
2040
perror_plus("mkdtemp");
1171
perror("mkdtemp");
2041
1172
goto end;
2042
1173
}
2043
1174
tempdir_created = true;
2044
1175
2045
if(quit_now){
2046
goto end;
2047
}
2048
2049
1176
if(not init_gpgme(pubkey, seckey, tempdir)){
2050
fprintf_plus(stderr, "init_gpgme failed\n");
2051
exitcode = EX_UNAVAILABLE;
1177
fprintf(stderr, "init_gpgme failed\n");
1178
exitcode = EXIT_FAILURE;
2052
1179
goto end;
2053
1180
} else {
2054
1181
gpgme_initialized = true;
2055
1182
}
2056
1183
2057
if(quit_now){
2058
goto end;
1184
if(interface[0] != '\0'){
1185
if_index = (AvahiIfIndex) if_nametoindex(interface);
1186
if(if_index == 0){
1187
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1188
exitcode = EXIT_FAILURE;
1189
goto end;
1190
}
2059
1191
}
2060
1192
2061
1193
if(connect_to != NULL){
2063
1195
/* (Mainly meant for debugging) */
2064
1196
char *address = strrchr(connect_to, ':');
2065
1197
if(address == NULL){
2066
fprintf_plus(stderr, "No colon in address\n");
2067
exitcode = EX_USAGE;
2068
goto end;
2069
}
2070
2071
if(quit_now){
2072
goto end;
2073
}
2074
1198
fprintf(stderr, "No colon in address\n");
1199
exitcode = EXIT_FAILURE;
1200
goto end;
1201
}
2075
1202
uint16_t port;
2076
errno = 0;
2077
tmpmax = strtoimax(address+1, &tmp, 10);
2078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2079
or tmpmax != (uint16_t)tmpmax){
2080
fprintf_plus(stderr, "Bad port number\n");
2081
exitcode = EX_USAGE;
2082
goto end;
2083
}
2084
2085
if(quit_now){
2086
goto end;
2087
}
2088
1203
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1204
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1205
or address[numchars+1] != '\0'){
1206
fprintf(stderr, "Bad port number\n");
1207
exitcode = EXIT_FAILURE;
1208
goto end;
1209
}
2089
1210
port = (uint16_t)tmpmax;
2090
1211
*address = '\0';
1212
address = connect_to;
2091
1213
/* Colon in address indicates IPv6 */
2092
1214
int af;
2093
if(strchr(connect_to, ':') != NULL){
1215
if(strchr(address, ':') != NULL){
2094
1216
af = AF_INET6;
2095
/* Accept [] around IPv6 address - see RFC 5952 */
2096
if(connect_to[0] == '[' and address[-1] == ']')
2097
{
2098
connect_to++;
2099
address[-1] = '\0';
2100
}
2101
1217
} else {
2102
1218
af = AF_INET;
2103
1219
}
2104
address = connect_to;
2105
2106
if(quit_now){
2107
goto end;
2108
}
2109
2110
while(not quit_now){
2111
ret = start_mandos_communication(address, port, if_index, af);
2112
if(quit_now or ret == 0){
2113
break;
2114
}
2115
if(debug){
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2117
(int)retry_interval);
2118
}
2119
sleep((int)retry_interval);
2120
}
2121
2122
if (not quit_now){
1220
ret = start_mandos_communication(address, port, if_index, af);
1221
if(ret < 0){
1222
exitcode = EXIT_FAILURE;
1223
} else {
2123
1224
exitcode = EXIT_SUCCESS;
2124
1225
}
1226
goto end;
1227
}
2125
1228
2126
goto end;
2127
}
2128
2129
if(quit_now){
2130
goto end;
2131
}
2132
2133
1229
{
2134
1230
AvahiServerConfig config;
2135
1231
/* Do not publish any local Zeroconf records */
2150
1246
2151
1247
/* Check if creating the Avahi server object succeeded */
2152
1248
if(mc.server == NULL){
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2154
avahi_strerror(error));
2155
exitcode = EX_UNAVAILABLE;
2156
goto end;
2157
}
2158
2159
if(quit_now){
1249
fprintf(stderr, "Failed to create Avahi server: %s\n",
1250
avahi_strerror(error));
1251
exitcode = EXIT_FAILURE;
2160
1252
goto end;
2161
1253
}
2162
1254
2163
1255
/* Create the Avahi service browser */
2164
1256
sb = avahi_s_service_browser_new(mc.server, if_index,
2165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1257
AVAHI_PROTO_INET6, "_mandos._tcp",
2166
1258
NULL, 0, browse_callback, NULL);
2167
1259
if(sb == NULL){
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2169
avahi_strerror(avahi_server_errno(mc.server)));
2170
exitcode = EX_UNAVAILABLE;
2171
goto end;
2172
}
2173
2174
if(quit_now){
1260
fprintf(stderr, "Failed to create service browser: %s\n",
1261
avahi_strerror(avahi_server_errno(mc.server)));
1262
exitcode = EXIT_FAILURE;
2175
1263
goto end;
2176
1264
}
2177
1265
2178
1266
/* Run the main loop */
2179
1267
2180
1268
if(debug){
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
2182
}
2183
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2186
if(debug){
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2189
}
1269
fprintf(stderr, "Starting Avahi loop search\n");
1270
}
1271
1272
avahi_simple_poll_loop(mc.simple_poll);
2190
1273
2191
1274
end:
2192
1275
2193
1276
if(debug){
2194
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1277
fprintf(stderr, "%s exiting\n", argv[0]);
2195
1278
}
2196
1279
2197
1280
/* Cleanup things */
2214
1297
gpgme_release(mc.ctx);
2215
1298
}
2216
1299
2217
/* Cleans up the circular linked list of Mandos servers the client
2218
has seen */
2219
if(mc.current_server != NULL){
2220
mc.current_server->prev->next = NULL;
2221
while(mc.current_server != NULL){
2222
server *next = mc.current_server->next;
2223
free(mc.current_server);
2224
mc.current_server = next;
2225
}
2226
}
2227
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
2232
{
2233
errno = 0;
2234
ret = seteuid(0);
2235
if(ret == -1){
2236
perror_plus("seteuid");
2237
}
2238
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2249
}
2250
}
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
if(ret == -1){
2253
perror_plus("close");
2254
}
2255
}
2256
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2263
2264
/* Removes the GPGME temp directory and all files inside */
1300
/* Removes the temp directory used by GPGME */
2265
1301
if(tempdir_created){
2266
struct dirent **direntries = NULL;
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
alphasort);
2270
if (numentries > 0){
2271
for(int i = 0; i < numentries; i++){
2272
direntry = direntries[i];
1302
DIR *d;
1303
struct dirent *direntry;
1304
d = opendir(tempdir);
1305
if(d == NULL){
1306
if(errno != ENOENT){
1307
perror("opendir");
1308
}
1309
} else {
1310
while(true){
1311
direntry = readdir(d);
1312
if(direntry == NULL){
1313
break;
1314
}
1315
/* Skip "." and ".." */
1316
if(direntry->d_name[0] == '.'
1317
and (direntry->d_name[1] == '\0'
1318
or (direntry->d_name[1] == '.'
1319
and direntry->d_name[2] == '\0'))){
1320
continue;
1321
}
2273
1322
char *fullname = NULL;
2274
1323
ret = asprintf(&fullname, "%s/%s", tempdir,
2275
1324
direntry->d_name);
2276
1325
if(ret < 0){
2277
perror_plus("asprintf");
1326
perror("asprintf");
2278
1327
continue;
2279
1328
}
2280
1329
ret = remove(fullname);
2281
1330
if(ret == -1){
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2283
strerror(errno));
1331
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1332
strerror(errno));
2284
1333
}
2285
1334
free(fullname);
2286
1335
}
2287
}
2288
2289
/* need to clean even if 0 because man page doesn't specify */
2290
free(direntries);
2291
if (numentries == -1){
2292
perror_plus("scandir");
1336
closedir(d);
2293
1337
}
2294
1338
ret = rmdir(tempdir);
2295
1339
if(ret == -1 and errno != ENOENT){
2296
perror_plus("rmdir");
2297
}
2298
}
2299
2300
if(quit_now){
2301
sigemptyset(&old_sigterm_action.sa_mask);
2302
old_sigterm_action.sa_handler = SIG_DFL;
2303
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2304
&old_sigterm_action,
2305
NULL));
2306
if(ret == -1){
2307
perror_plus("sigaction");
2308
}
2309
do {
2310
ret = raise(signal_received);
2311
} while(ret != 0 and errno == EINTR);
2312
if(ret != 0){
2313
perror_plus("raise");
2314
abort();
2315
}
2316
TEMP_FAILURE_RETRY(pause());
1340
perror("rmdir");
1341
}
2317
1342
}
2318
1343
2319
1344
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0