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- Committer: teddy at bsnet
- Date: 2011-11-13 20:49:21 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111113204921-vbnwtmuq01isvgsc
* initramfs-tools-hook: Install network hooks (and any required files)
in the initramfs image.
* plugins.d/mandos-client.c (main): Also set MANDOSNETHOOKDIR for
network hooks.
* plugins.d/mandos-client.xml (OPTIONS): Use <filename
class="directory">, not
<directory>.
in the initramfs image.
* plugins.d/mandos-client.c (main): Also set MANDOSNETHOOKDIR for
network hooks.
* plugins.d/mandos-client.xml (OPTIONS): Use <filename
class="directory">, not
<directory>.
- files added:
- DBUS-API
- debian/source
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
39
43
stdout, ferror(), remove() */
40
44
#include <stdint.h> /* uint16_t, uint32_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
44
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
50
strerror(), asprintf(), strcpy() */
49
53
sockaddr_in6, PF_INET6,
50
54
SOCK_STREAM, uid_t, gid_t, open(),
51
55
opendir(), DIR */
52
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
53
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
58
inet_pton(), connect() */
55
59
#include <fcntl.h> /* open() */
58
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
59
63
strtoimax() */
60
64
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
69
SIOCSIFFLAGS, if_indextoname(),
65
70
if_nametoindex(), IF_NAMESIZE */
67
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
73
*/
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
73
78
#include <iso646.h> /* not, or, and */
74
79
#include <argp.h> /* struct argp_option, error_t, struct
75
80
argp_state, struct argp,
76
81
argp_parse(), ARGP_KEY_ARG,
77
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
83
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
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() */
81
90
82
91
#ifdef __linux__
83
92
#include <sys/klog.h> /* klogctl() */
101
110
init_gnutls_session(),
102
111
GNUTLS_* */
103
112
#include <gnutls/openpgp.h>
104
/* gnutls_certificate_set_openpgp_key_file(),
105
GNUTLS_OPENPGP_FMT_BASE64 */
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
106
115
107
116
/* GPGME */
108
117
#include <gpgme.h> /* All GPGME types, constants and
116
125
#define PATHDIR "/conf/conf.d/mandos"
117
126
#define SECKEY "seckey.txt"
118
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
119
129
120
130
bool debug = false;
121
131
static const char mandos_protocol_version[] = "1";
122
132
const char *argp_program_version = "mandos-client " VERSION;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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;
124
148
125
149
/* Used for passing in values through the Avahi callback functions */
126
150
typedef struct {
131
155
gnutls_dh_params_t dh_params;
132
156
const char *priority;
133
157
gpgme_ctx_t ctx;
158
server *current_server;
134
159
} mandos_context;
135
160
136
161
/* global context so signal handler can reach it*/
137
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
138
163
.dh_bits = 1024, .priority = "SECURE256"
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
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
}
140
176
141
177
/*
142
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
144
180
* "buffer_length" is how much is already used.
145
181
*/
146
182
size_t incbuffer(char **buffer, size_t buffer_length,
147
size_t buffer_capacity){
183
size_t buffer_capacity){
148
184
if(buffer_length + BUFFER_SIZE > buffer_capacity){
149
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
150
186
if(buffer == NULL){
155
191
return buffer_capacity;
156
192
}
157
193
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
197
int ret;
198
server *new_server = malloc(sizeof(server));
199
if(new_server == NULL){
200
perror_plus("malloc");
201
return -1;
202
}
203
*new_server = (server){ .ip = strdup(ip),
204
.port = port,
205
.if_index = if_index,
206
.af = af };
207
if(new_server->ip == NULL){
208
perror_plus("strdup");
209
return -1;
210
}
211
/* Special case of first server */
212
if (mc.current_server == NULL){
213
new_server->next = new_server;
214
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
217
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
220
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
229
}
230
158
231
/*
159
232
* Initialize GPGME.
160
233
*/
161
static bool init_gpgme(const char *seckey,
162
const char *pubkey, const char *tempdir){
163
int ret;
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
164
236
gpgme_error_t rc;
165
237
gpgme_engine_info_t engine_info;
166
238
169
241
* Helper function to insert pub and seckey to the engine keyring.
170
242
*/
171
243
bool import_key(const char *filename){
244
int ret;
172
245
int fd;
173
246
gpgme_data_t pgp_data;
174
247
175
248
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
176
249
if(fd == -1){
177
perror("open");
250
perror_plus("open");
178
251
return false;
179
252
}
180
253
181
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
182
255
if(rc != GPG_ERR_NO_ERROR){
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
184
258
gpgme_strsource(rc), gpgme_strerror(rc));
185
259
return false;
186
260
}
187
261
188
262
rc = gpgme_op_import(mc.ctx, pgp_data);
189
263
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
191
266
gpgme_strsource(rc), gpgme_strerror(rc));
192
267
return false;
193
268
}
194
269
195
270
ret = (int)TEMP_FAILURE_RETRY(close(fd));
196
271
if(ret == -1){
197
perror("close");
272
perror_plus("close");
198
273
}
199
274
gpgme_data_release(pgp_data);
200
275
return true;
201
276
}
202
277
203
278
if(debug){
204
fprintf(stderr, "Initializing GPGME\n");
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
205
281
}
206
282
207
283
/* Init GPGME */
208
284
gpgme_check_version(NULL);
209
285
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
210
286
if(rc != GPG_ERR_NO_ERROR){
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
212
289
gpgme_strsource(rc), gpgme_strerror(rc));
213
290
return false;
214
291
}
215
292
216
/* Set GPGME home directory for the OpenPGP engine only */
293
/* Set GPGME home directory for the OpenPGP engine only */
217
294
rc = gpgme_get_engine_info(&engine_info);
218
295
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
220
298
gpgme_strsource(rc), gpgme_strerror(rc));
221
299
return false;
222
300
}
229
307
engine_info = engine_info->next;
230
308
}
231
309
if(engine_info == NULL){
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
233
312
return false;
234
313
}
235
314
236
315
/* Create new GPGME "context" */
237
316
rc = gpgme_new(&(mc.ctx));
238
317
if(rc != GPG_ERR_NO_ERROR){
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
241
321
return false;
242
322
}
243
323
245
325
return false;
246
326
}
247
327
248
return true;
328
return true;
249
329
}
250
330
251
331
/*
262
342
ssize_t plaintext_length = 0;
263
343
264
344
if(debug){
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
266
347
}
267
348
268
349
/* Create new GPGME data buffer from memory cryptotext */
269
350
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
270
351
0);
271
352
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
273
355
gpgme_strsource(rc), gpgme_strerror(rc));
274
356
return -1;
275
357
}
277
359
/* Create new empty GPGME data buffer for the plaintext */
278
360
rc = gpgme_data_new(&dh_plain);
279
361
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
281
364
gpgme_strsource(rc), gpgme_strerror(rc));
282
365
gpgme_data_release(dh_crypto);
283
366
return -1;
287
370
data buffer */
288
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
289
372
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
291
375
gpgme_strsource(rc), gpgme_strerror(rc));
292
376
plaintext_length = -1;
293
377
if(debug){
294
378
gpgme_decrypt_result_t result;
295
379
result = gpgme_op_decrypt_result(mc.ctx);
296
380
if(result == NULL){
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
298
383
} else {
299
fprintf(stderr, "Unsupported algorithm: %s\n",
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
300
386
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
302
389
result->wrong_key_usage);
303
390
if(result->file_name != NULL){
304
fprintf(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
305
393
}
306
394
gpgme_recipient_t recipient;
307
395
recipient = result->recipients;
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
}
396
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
406
recipient = recipient->next;
318
407
}
319
408
}
320
409
}
322
411
}
323
412
324
413
if(debug){
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
326
416
}
327
417
328
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
329
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
330
perror("gpgme_data_seek");
420
perror_plus("gpgme_data_seek");
331
421
plaintext_length = -1;
332
422
goto decrypt_end;
333
423
}
335
425
*plaintext = NULL;
336
426
while(true){
337
427
plaintext_capacity = incbuffer(plaintext,
338
(size_t)plaintext_length,
339
plaintext_capacity);
428
(size_t)plaintext_length,
429
plaintext_capacity);
340
430
if(plaintext_capacity == 0){
341
perror("incbuffer");
342
plaintext_length = -1;
343
goto decrypt_end;
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
344
434
}
345
435
346
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
351
441
break;
352
442
}
353
443
if(ret < 0){
354
perror("gpgme_data_read");
444
perror_plus("gpgme_data_read");
355
445
plaintext_length = -1;
356
446
goto decrypt_end;
357
447
}
359
449
}
360
450
361
451
if(debug){
362
fprintf(stderr, "Decrypted password is: ");
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
363
454
for(ssize_t i = 0; i < plaintext_length; i++){
364
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
365
456
}
387
478
/* GnuTLS log function callback */
388
479
static void debuggnutls(__attribute__((unused)) int level,
389
480
const char* string){
390
fprintf(stderr, "GnuTLS: %s", string);
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
391
482
}
392
483
393
484
static int init_gnutls_global(const char *pubkeyfilename,
395
486
int ret;
396
487
397
488
if(debug){
398
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
399
491
}
400
492
401
493
ret = gnutls_global_init();
402
494
if(ret != GNUTLS_E_SUCCESS){
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
405
497
return -1;
406
498
}
407
499
414
506
}
415
507
416
508
/* OpenPGP credentials */
417
gnutls_certificate_allocate_credentials(&mc.cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
418
510
if(ret != GNUTLS_E_SUCCESS){
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
424
513
gnutls_global_deinit();
425
514
return -1;
426
515
}
427
516
428
517
if(debug){
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
430
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
431
521
seckeyfilename);
432
522
}
436
526
GNUTLS_OPENPGP_FMT_BASE64);
437
527
if(ret != GNUTLS_E_SUCCESS){
438
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
439
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
440
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
441
fprintf(stderr, "The GnuTLS error is: %s\n",
442
safer_gnutls_strerror(ret));
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
443
534
goto globalfail;
444
535
}
445
536
446
537
/* GnuTLS server initialization */
447
538
ret = gnutls_dh_params_init(&mc.dh_params);
448
539
if(ret != GNUTLS_E_SUCCESS){
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
450
542
" %s\n", safer_gnutls_strerror(ret));
451
543
goto globalfail;
452
544
}
453
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
454
546
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
456
549
safer_gnutls_strerror(ret));
457
550
goto globalfail;
458
551
}
472
565
static int init_gnutls_session(gnutls_session_t *session){
473
566
int ret;
474
567
/* GnuTLS session creation */
475
ret = gnutls_init(session, GNUTLS_SERVER);
568
do {
569
ret = gnutls_init(session, GNUTLS_SERVER);
570
if(quit_now){
571
return -1;
572
}
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
476
574
if(ret != GNUTLS_E_SUCCESS){
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
478
577
safer_gnutls_strerror(ret));
479
578
}
480
579
481
580
{
482
581
const char *err;
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
584
if(quit_now){
585
gnutls_deinit(*session);
586
return -1;
587
}
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
484
589
if(ret != GNUTLS_E_SUCCESS){
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
488
594
gnutls_deinit(*session);
489
595
return -1;
490
596
}
491
597
}
492
598
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
599
do {
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
602
if(quit_now){
603
gnutls_deinit(*session);
604
return -1;
605
}
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
607
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
497
610
safer_gnutls_strerror(ret));
498
611
gnutls_deinit(*session);
499
612
return -1;
500
613
}
501
614
502
615
/* ignore client certificate if any. */
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
617
506
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
507
619
516
628
static int start_mandos_communication(const char *ip, uint16_t port,
517
629
AvahiIfIndex if_index,
518
630
int af){
519
int ret, tcp_sd;
631
int ret, tcp_sd = -1;
520
632
ssize_t sret;
521
633
union {
522
634
struct sockaddr_in in;
523
635
struct sockaddr_in6 in6;
524
636
} to;
525
637
char *buffer = NULL;
526
char *decrypted_buffer;
638
char *decrypted_buffer = NULL;
527
639
size_t buffer_length = 0;
528
640
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
530
641
size_t written;
531
int retval = 0;
642
int retval = -1;
532
643
gnutls_session_t session;
533
644
int pf; /* Protocol family */
534
645
646
errno = 0;
647
648
if(quit_now){
649
errno = EINTR;
650
return -1;
651
}
652
535
653
switch(af){
536
654
case AF_INET6:
537
655
pf = PF_INET6;
540
658
pf = PF_INET;
541
659
break;
542
660
default:
543
fprintf(stderr, "Bad address family: %d\n", af);
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
663
errno = EINVAL;
544
664
return -1;
545
665
}
546
666
550
670
}
551
671
552
672
if(debug){
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
554
675
"\n", ip, port);
555
676
}
556
677
557
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
558
679
if(tcp_sd < 0){
559
perror("socket");
560
return -1;
680
int e = errno;
681
perror_plus("socket");
682
errno = e;
683
goto mandos_end;
684
}
685
686
if(quit_now){
687
errno = EINTR;
688
goto mandos_end;
561
689
}
562
690
563
691
memset(&to, 0, sizeof(to));
564
692
if(af == AF_INET6){
565
to.in6.sin6_family = (uint16_t)af;
693
to.in6.sin6_family = (sa_family_t)af;
566
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
567
695
} else { /* IPv4 */
568
696
to.in.sin_family = (sa_family_t)af;
569
697
ret = inet_pton(af, ip, &to.in.sin_addr);
570
698
}
571
699
if(ret < 0 ){
572
perror("inet_pton");
573
return -1;
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
703
goto mandos_end;
574
704
}
575
705
if(ret == 0){
576
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
710
goto mandos_end;
578
711
}
579
712
if(af == AF_INET6){
580
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
583
716
584
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
585
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
586
-Wunreachable-code*/
719
-Wunreachable-code*/
587
720
if(if_index == AVAHI_IF_UNSPEC){
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
589
723
" without a network interface\n");
590
return -1;
724
errno = EINVAL;
725
goto mandos_end;
591
726
}
592
727
/* Set the network interface number as scope */
593
728
to.in6.sin6_scope_id = (uint32_t)if_index;
598
733
-Wunreachable-code */
599
734
}
600
735
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
601
741
if(debug){
602
742
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
743
char interface[IF_NAMESIZE];
604
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
605
perror("if_indextoname");
745
perror_plus("if_indextoname");
606
746
} else {
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
608
749
ip, interface, port);
609
750
}
610
751
} else {
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
613
754
}
614
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
615
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
622
763
sizeof(addrstr));
623
764
}
624
765
if(pcret == NULL){
625
perror("inet_ntop");
766
perror_plus("inet_ntop");
626
767
} else {
627
768
if(strcmp(addrstr, ip) != 0){
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
629
771
}
630
772
}
631
773
}
632
774
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
779
633
780
if(af == AF_INET6){
634
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
635
782
} else {
636
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
637
784
}
638
785
if(ret < 0){
639
perror("connect");
640
return -1;
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
791
goto mandos_end;
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
641
797
}
642
798
643
799
const char *out = mandos_protocol_version;
645
801
while(true){
646
802
size_t out_size = strlen(out);
647
803
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
out_size - written));
804
out_size - written));
649
805
if(ret == -1){
650
perror("write");
651
retval = -1;
806
int e = errno;
807
perror_plus("write");
808
errno = e;
652
809
goto mandos_end;
653
810
}
654
811
written += (size_t)ret;
662
819
break;
663
820
}
664
821
}
822
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
665
827
}
666
828
667
829
if(debug){
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
}
670
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
832
}
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
/* Spurious warning from -Wint-to-pointer-cast */
671
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
841
673
do{
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
do {
674
848
ret = gnutls_handshake(session);
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
675
853
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
676
854
677
855
if(ret != GNUTLS_E_SUCCESS){
678
856
if(debug){
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
680
859
gnutls_perror(ret);
681
860
}
682
retval = -1;
861
errno = EPROTO;
683
862
goto mandos_end;
684
863
}
685
864
686
865
/* Read OpenPGP packet that contains the wanted password */
687
866
688
867
if(debug){
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
690
ip);
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
691
870
}
692
871
693
872
while(true){
873
874
if(quit_now){
875
errno = EINTR;
876
goto mandos_end;
877
}
878
694
879
buffer_capacity = incbuffer(&buffer, buffer_length,
695
buffer_capacity);
880
buffer_capacity);
696
881
if(buffer_capacity == 0){
697
perror("incbuffer");
698
retval = -1;
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
885
goto mandos_end;
886
}
887
888
if(quit_now){
889
errno = EINTR;
699
890
goto mandos_end;
700
891
}
701
892
710
901
case GNUTLS_E_AGAIN:
711
902
break;
712
903
case GNUTLS_E_REHANDSHAKE:
713
do{
904
do {
714
905
ret = gnutls_handshake(session);
906
907
if(quit_now){
908
errno = EINTR;
909
goto mandos_end;
910
}
715
911
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
716
912
if(ret < 0){
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
718
915
gnutls_perror(ret);
719
retval = -1;
916
errno = EPROTO;
720
917
goto mandos_end;
721
918
}
722
919
break;
723
920
default:
724
fprintf(stderr, "Unknown error while reading data from"
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
725
923
" encrypted session with Mandos server\n");
726
retval = -1;
727
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
728
926
goto mandos_end;
729
927
}
730
928
} else {
733
931
}
734
932
735
933
if(debug){
736
fprintf(stderr, "Closing TLS session\n");
737
}
738
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
936
}
937
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
do {
944
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
950
741
951
if(buffer_length > 0){
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
buffer_length,
952
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
744
954
&decrypted_buffer);
745
955
if(decrypted_buffer_size >= 0){
956
746
957
written = 0;
747
958
while(written < (size_t) decrypted_buffer_size){
959
if(quit_now){
960
errno = EINTR;
961
goto mandos_end;
962
}
963
748
964
ret = (int)fwrite(decrypted_buffer + written, 1,
749
965
(size_t)decrypted_buffer_size - written,
750
966
stdout);
751
967
if(ret == 0 and ferror(stdout)){
968
int e = errno;
752
969
if(debug){
753
fprintf(stderr, "Error writing encrypted data: %s\n",
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
754
972
strerror(errno));
755
973
}
756
retval = -1;
757
break;
974
errno = e;
975
goto mandos_end;
758
976
}
759
977
written += (size_t)ret;
760
978
}
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
979
retval = 0;
764
980
}
765
} else {
766
retval = -1;
767
981
}
768
982
769
983
/* Shutdown procedure */
770
984
771
985
mandos_end:
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
986
{
987
int e = errno;
988
free(decrypted_buffer);
989
free(buffer);
990
if(tcp_sd >= 0){
991
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
992
}
993
if(ret == -1){
994
if(e == 0){
995
e = errno;
996
}
997
perror_plus("close");
998
}
999
gnutls_deinit(session);
1000
errno = e;
1001
if(quit_now){
1002
errno = EINTR;
1003
retval = -1;
1004
}
776
1005
}
777
gnutls_deinit(session);
778
1006
return retval;
779
1007
}
780
1008
797
1025
/* Called whenever a service has been resolved successfully or
798
1026
timed out */
799
1027
1028
if(quit_now){
1029
return;
1030
}
1031
800
1032
switch(event){
801
1033
default:
802
1034
case AVAHI_RESOLVER_FAILURE:
803
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
804
1037
" of type '%s' in domain '%s': %s\n", name, type, domain,
805
1038
avahi_strerror(avahi_server_errno(mc.server)));
806
1039
break;
810
1043
char ip[AVAHI_ADDRESS_STR_MAX];
811
1044
avahi_address_snprint(ip, sizeof(ip), address);
812
1045
if(debug){
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
814
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
1049
ip, (intmax_t)interface, port);
816
1050
}
818
1052
avahi_proto_to_af(proto));
819
1053
if(ret == 0){
820
1054
avahi_simple_poll_quit(mc.simple_poll);
1055
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
821
1058
}
822
1059
}
823
1060
}
839
1076
/* Called whenever a new services becomes available on the LAN or
840
1077
is removed from the LAN */
841
1078
1079
if(quit_now){
1080
return;
1081
}
1082
842
1083
switch(event){
843
1084
default:
844
1085
case AVAHI_BROWSER_FAILURE:
845
1086
846
fprintf(stderr, "(Avahi browser) %s\n",
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
847
1089
avahi_strerror(avahi_server_errno(mc.server)));
848
1090
avahi_simple_poll_quit(mc.simple_poll);
849
1091
return;
854
1096
the callback function is called the Avahi server will free the
855
1097
resolver for us. */
856
1098
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",
1099
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1100
name, type, domain, protocol, 0,
1101
resolve_callback, NULL) == NULL)
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
862
1104
name, avahi_strerror(avahi_server_errno(mc.server)));
863
1105
break;
864
1106
868
1110
case AVAHI_BROWSER_ALL_FOR_NOW:
869
1111
case AVAHI_BROWSER_CACHE_EXHAUSTED:
870
1112
if(debug){
871
fprintf(stderr, "No Mandos server found, still searching...\n");
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
872
1115
}
873
1116
break;
874
1117
}
875
1118
}
876
1119
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){
1120
/* Signal handler that stops main loop after SIGTERM */
1121
static void handle_sigterm(int sig){
881
1122
if(quit_now){
882
1123
return;
883
1124
}
884
1125
quit_now = 1;
1126
signal_received = sig;
885
1127
int old_errno = errno;
1128
/* set main loop to exit */
886
1129
if(mc.simple_poll != NULL){
887
1130
avahi_simple_poll_quit(mc.simple_poll);
888
1131
}
889
1132
errno = old_errno;
890
1133
}
891
1134
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
int ret;
1137
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
if(s < 0){
1140
perror_plus("socket");
1141
return false;
1142
}
1143
strcpy(ifr->ifr_name, ifname);
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
if(ret == -1){
1146
if(debug){
1147
perror_plus("ioctl SIOCGIFFLAGS");
1148
}
1149
return false;
1150
}
1151
return true;
1152
}
1153
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1161
}
1162
return false;
1163
}
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1169
}
1170
return true;
1171
}
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1177
}
1178
return false;
1179
}
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1182
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1185
}
1186
return false;
1187
}
1188
1189
/* Accept this device */
1190
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1193
}
1194
return true;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int good_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(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1212
if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1227
*/
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1230
return 0;
1231
}
1232
1233
struct ifreq ifr;
1234
if(not get_flags(if_entry->d_name, &ifr)){
1235
if(debug){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1245
if(debug){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1255
if(debug){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1258
if_entry->d_name);
1259
}
1260
return 0;
1261
}
1262
1263
if(not good_flags(if_entry->d_name, &ifr)){
1264
return 0;
1265
}
1266
return 1;
1267
}
1268
1269
int notdotentries(const struct dirent *direntry){
1270
/* Skip "." and ".." */
1271
if(direntry->d_name[0] == '.'
1272
and (direntry->d_name[1] == '\0'
1273
or (direntry->d_name[1] == '.'
1274
and direntry->d_name[2] == '\0'))){
1275
return 0;
1276
}
1277
return 1;
1278
}
1279
1280
/* Is this directory entry a runnable program? */
1281
int runnable_hook(const struct dirent *direntry){
1282
int ret;
1283
size_t sret;
1284
struct stat st;
1285
1286
if((direntry->d_name)[0] == '\0'){
1287
/* Empty name? */
1288
return 0;
1289
}
1290
1291
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
"abcdefghijklmnopqrstuvwxyz"
1293
"0123456789"
1294
"_-");
1295
if((direntry->d_name)[sret] != '\0'){
1296
/* Contains non-allowed characters */
1297
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
1305
char *fullname = NULL;
1306
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1307
if(ret < 0){
1308
perror_plus("asprintf");
1309
return 0;
1310
}
1311
1312
ret = stat(fullname, &st);
1313
if(ret == -1){
1314
if(debug){
1315
perror_plus("Could not stat hook");
1316
}
1317
return 0;
1318
}
1319
if(not (S_ISREG(st.st_mode))){
1320
/* Not a regular file */
1321
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1325
}
1326
return 0;
1327
}
1328
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
/* Not executable */
1330
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1334
}
1335
return 0;
1336
}
1337
return 1;
1338
}
1339
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1341
int ret;
1342
struct timespec now;
1343
struct timespec waited_time;
1344
intmax_t block_time;
1345
1346
while(true){
1347
if(mc.current_server == NULL){
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1351
}
1352
ret = avahi_simple_poll_iterate(s, -1);
1353
} else {
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1358
}
1359
/* the current time */
1360
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1361
if(ret == -1){
1362
perror_plus("clock_gettime");
1363
return -1;
1364
}
1365
/* Calculating in ms how long time between now and server
1366
who we visted longest time ago. Now - last seen. */
1367
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1369
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1371
/* total time is 10s/10,000ms.
1372
Converting to s from ms by dividing by 1,000,
1373
and ns to ms by dividing by 1,000,000. */
1374
block_time = ((retry_interval
1375
- ((intmax_t)waited_time.tv_sec * 1000))
1376
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1381
}
1382
1383
if(block_time <= 0){
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
mc.current_server->af);
1388
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1390
return 0;
1391
}
1392
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1394
if(ret == -1){
1395
perror_plus("clock_gettime");
1396
return -1;
1397
}
1398
mc.current_server = mc.current_server->next;
1399
block_time = 0; /* Call avahi to find new Mandos
1400
servers, but don't block */
1401
}
1402
1403
ret = avahi_simple_poll_iterate(s, (int)block_time);
1404
}
1405
if(ret != 0){
1406
if (ret > 0 or errno != EINTR){
1407
return (ret != 1) ? ret : 0;
1408
}
1409
}
1410
}
1411
}
1412
892
1413
int main(int argc, char *argv[]){
893
1414
AvahiSServiceBrowser *sb = NULL;
894
1415
int error;
896
1417
intmax_t tmpmax;
897
1418
char *tmp;
898
1419
int exitcode = EXIT_SUCCESS;
899
const char *interface = "eth0";
1420
const char *interface = "";
900
1421
struct ifreq network;
901
int sd;
1422
int sd = -1;
1423
bool take_down_interface = false;
902
1424
uid_t uid;
903
1425
gid_t gid;
904
char *connect_to = NULL;
905
1426
char tempdir[] = "/tmp/mandosXXXXXX";
906
1427
bool tempdir_created = false;
907
1428
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
908
1429
const char *seckey = PATHDIR "/" SECKEY;
909
1430
const char *pubkey = PATHDIR "/" PUBKEY;
910
1431
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" };
915
1432
bool gnutls_initialized = false;
916
1433
bool gpgme_initialized = false;
917
1434
float delay = 2.5f;
1435
double retry_interval = 10; /* 10s between trying a server and
1436
retrying the same server again */
918
1437
919
struct sigaction old_sigterm_action;
1438
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
920
1439
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
921
1440
1441
uid = getuid();
1442
gid = getgid();
1443
1444
/* Lower any group privileges we might have, just to be safe */
1445
errno = 0;
1446
ret = setgid(gid);
1447
if(ret == -1){
1448
perror_plus("setgid");
1449
}
1450
1451
/* Lower user privileges (temporarily) */
1452
errno = 0;
1453
ret = seteuid(uid);
1454
if(ret == -1){
1455
perror_plus("seteuid");
1456
}
1457
1458
if(quit_now){
1459
goto end;
1460
}
1461
922
1462
{
923
1463
struct argp_option options[] = {
924
1464
{ .name = "debug", .key = 128,
953
1493
.arg = "SECONDS",
954
1494
.doc = "Maximum delay to wait for interface startup",
955
1495
.group = 2 },
1496
{ .name = "retry", .key = 132,
1497
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
1499
.group = 2 },
1500
{ .name = "network-hook-dir", .key = 133,
1501
.arg = "DIR",
1502
.doc = "Directory where network hooks are located",
1503
.group = 2 },
1504
/*
1505
* These reproduce what we would get without ARGP_NO_HELP
1506
*/
1507
{ .name = "help", .key = '?',
1508
.doc = "Give this help list", .group = -1 },
1509
{ .name = "usage", .key = -3,
1510
.doc = "Give a short usage message", .group = -1 },
1511
{ .name = "version", .key = 'V',
1512
.doc = "Print program version", .group = -1 },
956
1513
{ .name = NULL }
957
1514
};
958
1515
959
1516
error_t parse_opt(int key, char *arg,
960
1517
struct argp_state *state){
1518
errno = 0;
961
1519
switch(key){
962
1520
case 128: /* --debug */
963
1521
debug = true;
979
1537
tmpmax = strtoimax(arg, &tmp, 10);
980
1538
if(errno != 0 or tmp == arg or *tmp != '\0'
981
1539
or tmpmax != (typeof(mc.dh_bits))tmpmax){
982
fprintf(stderr, "Bad number of DH bits\n");
983
exit(EXIT_FAILURE);
1540
argp_error(state, "Bad number of DH bits");
984
1541
}
985
1542
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
986
1543
break;
991
1548
errno = 0;
992
1549
delay = strtof(arg, &tmp);
993
1550
if(errno != 0 or tmp == arg or *tmp != '\0'){
994
fprintf(stderr, "Bad delay\n");
995
exit(EXIT_FAILURE);
996
}
997
break;
998
case ARGP_KEY_ARG:
999
argp_usage(state);
1000
case ARGP_KEY_END:
1551
argp_error(state, "Bad delay");
1552
}
1553
case 132: /* --retry */
1554
errno = 0;
1555
retry_interval = strtod(arg, &tmp);
1556
if(errno != 0 or tmp == arg or *tmp != '\0'
1557
or (retry_interval * 1000) > INT_MAX
1558
or retry_interval < 0){
1559
argp_error(state, "Bad retry interval");
1560
}
1561
break;
1562
case 133: /* --network-hook-dir */
1563
hookdir = arg;
1564
break;
1565
/*
1566
* These reproduce what we would get without ARGP_NO_HELP
1567
*/
1568
case '?': /* --help */
1569
argp_state_help(state, state->out_stream,
1570
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1571
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1572
case -3: /* --usage */
1573
argp_state_help(state, state->out_stream,
1574
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
1578
exit(argp_err_exit_status);
1001
1579
break;
1002
1580
default:
1003
1581
return ARGP_ERR_UNKNOWN;
1004
1582
}
1005
return 0;
1583
return errno;
1006
1584
}
1007
1585
1008
1586
struct argp argp = { .options = options, .parser = parse_opt,
1009
1587
.args_doc = "",
1010
1588
.doc = "Mandos client -- Get and decrypt"
1011
1589
" passwords from a Mandos server" };
1012
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1013
if(ret == ARGP_ERR_UNKNOWN){
1014
fprintf(stderr, "Unknown error while parsing arguments\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1590
ret = argp_parse(&argp, argc, argv,
1591
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1592
switch(ret){
1593
case 0:
1594
break;
1595
case ENOMEM:
1596
default:
1597
errno = ret;
1598
perror_plus("argp_parse");
1599
exitcode = EX_OSERR;
1600
goto end;
1601
case EINVAL:
1602
exitcode = EX_USAGE;
1603
goto end;
1604
}
1605
}
1606
1607
{
1608
/* Work around Debian bug #633582:
1609
<http://bugs.debian.org/633582> */
1610
struct stat st;
1611
1612
/* Re-raise priviliges */
1613
errno = 0;
1614
ret = seteuid(0);
1615
if(ret == -1){
1616
perror_plus("seteuid");
1617
}
1618
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1623
} else {
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1625
if(ret == -1){
1626
perror_plus("fstat");
1627
} else {
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1630
if(ret == -1){
1631
perror_plus("fchown");
1632
}
1633
}
1634
}
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1636
}
1637
}
1638
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1643
} else {
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1645
if(ret == -1){
1646
perror_plus("fstat");
1647
} else {
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1650
if(ret == -1){
1651
perror_plus("fchown");
1652
}
1653
}
1654
}
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1656
}
1657
}
1658
1659
/* Lower privileges */
1660
errno = 0;
1661
ret = seteuid(uid);
1662
if(ret == -1){
1663
perror_plus("seteuid");
1664
}
1665
}
1666
1667
/* Find network hooks and run them */
1668
{
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1672
alphasort);
1673
if(numhooks == -1){
1674
perror_plus("scandir");
1675
} else {
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1681
if(ret < 0){
1682
perror_plus("asprintf");
1683
continue;
1684
}
1685
pid_t hook_pid = fork();
1686
if(hook_pid == 0){
1687
/* Child */
1688
dup2(devnull, STDIN_FILENO);
1689
close(devnull);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("DEVICE", interface, 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
ret = setenv("MODE", "start", 1);
1707
if(ret == -1){
1708
perror_plus("setenv");
1709
exit(1);
1710
}
1711
char *delaystring;
1712
ret = asprintf(&delaystring, "%f", delay);
1713
if(ret == -1){
1714
perror_plus("asprintf");
1715
exit(1);
1716
}
1717
ret = setenv("DELAY", delaystring, 1);
1718
if(ret == -1){
1719
free(delaystring);
1720
perror_plus("setenv");
1721
exit(1);
1722
}
1723
free(delaystring);
1724
ret = execl(fullname, direntry->d_name, "start", NULL);
1725
perror_plus("execl");
1726
} else {
1727
int status;
1728
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1729
perror_plus("waitpid");
1730
free(fullname);
1731
continue;
1732
}
1733
if(WIFEXITED(status)){
1734
if(WEXITSTATUS(status) != 0){
1735
fprintf(stderr, "Mandos plugin mandos-client: "
1736
"Warning: network hook \"%s\" exited"
1737
" with status %d\n", direntry->d_name,
1738
WEXITSTATUS(status));
1739
free(fullname);
1740
continue;
1741
}
1742
} else if(WIFSIGNALED(status)){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" died by"
1745
" signal %d\n", direntry->d_name,
1746
WTERMSIG(status));
1747
free(fullname);
1748
continue;
1749
} else {
1750
fprintf(stderr, "Mandos plugin mandos-client: "
1751
"Warning: network hook \"%s\" crashed\n",
1752
direntry->d_name);
1753
free(fullname);
1754
continue;
1755
}
1756
}
1757
free(fullname);
1758
if(quit_now){
1759
goto end;
1760
}
1761
}
1762
close(devnull);
1017
1763
}
1018
1764
}
1019
1765
1021
1767
avahi_set_log_function(empty_log);
1022
1768
}
1023
1769
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf(stderr, "Mandos plugin mandos-client: "
1786
"Using interface \"%s\"\n", interface);
1787
}
1788
if(interface == NULL){
1789
perror_plus("malloc");
1790
free(direntries);
1791
exitcode = EXIT_FAILURE;
1792
goto end;
1793
}
1794
free(direntries);
1795
} else {
1796
free(direntries);
1797
fprintf(stderr, "Mandos plugin mandos-client: "
1798
"Could not find a network interface\n");
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
}
1803
1024
1804
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1025
1805
from the signal handler */
1026
1806
/* Initialize the pseudo-RNG for Avahi */
1027
1807
srand((unsigned int) time(NULL));
1028
1808
mc.simple_poll = avahi_simple_poll_new();
1029
1809
if(mc.simple_poll == NULL){
1030
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1031
exitcode = EXIT_FAILURE;
1810
fprintf(stderr, "Mandos plugin mandos-client: "
1811
"Avahi: Failed to create simple poll object.\n");
1812
exitcode = EX_UNAVAILABLE;
1032
1813
goto end;
1033
1814
}
1034
1815
1035
1816
sigemptyset(&sigterm_action.sa_mask);
1036
1817
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1037
1818
if(ret == -1){
1038
perror("sigaddset");
1039
exitcode = EXIT_FAILURE;
1819
perror_plus("sigaddset");
1820
exitcode = EX_OSERR;
1040
1821
goto end;
1041
1822
}
1042
1823
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1043
1824
if(ret == -1){
1044
perror("sigaddset");
1045
exitcode = EXIT_FAILURE;
1825
perror_plus("sigaddset");
1826
exitcode = EX_OSERR;
1046
1827
goto end;
1047
1828
}
1048
1829
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1049
1830
if(ret == -1){
1050
perror("sigaddset");
1051
exitcode = EXIT_FAILURE;
1052
goto end;
1053
}
1054
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1055
if(ret == -1){
1056
perror("sigaction");
1057
exitcode = EXIT_FAILURE;
1058
goto end;
1059
}
1831
perror_plus("sigaddset");
1832
exitcode = EX_OSERR;
1833
goto end;
1834
}
1835
/* Need to check if the handler is SIG_IGN before handling:
1836
| [[info:libc:Initial Signal Actions]] |
1837
| [[info:libc:Basic Signal Handling]] |
1838
*/
1839
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1840
if(ret == -1){
1841
perror_plus("sigaction");
1842
return EX_OSERR;
1843
}
1844
if(old_sigterm_action.sa_handler != SIG_IGN){
1845
ret = sigaction(SIGINT, &sigterm_action, NULL);
1846
if(ret == -1){
1847
perror_plus("sigaction");
1848
exitcode = EX_OSERR;
1849
goto end;
1850
}
1851
}
1852
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1853
if(ret == -1){
1854
perror_plus("sigaction");
1855
return EX_OSERR;
1856
}
1857
if(old_sigterm_action.sa_handler != SIG_IGN){
1858
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1859
if(ret == -1){
1860
perror_plus("sigaction");
1861
exitcode = EX_OSERR;
1862
goto end;
1863
}
1864
}
1865
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1866
if(ret == -1){
1867
perror_plus("sigaction");
1868
return EX_OSERR;
1869
}
1870
if(old_sigterm_action.sa_handler != SIG_IGN){
1871
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1872
if(ret == -1){
1873
perror_plus("sigaction");
1874
exitcode = EX_OSERR;
1875
goto end;
1876
}
1877
}
1060
1878
1061
1879
/* If the interface is down, bring it up */
1062
if(interface[0] != '\0'){
1880
if(strcmp(interface, "none") != 0){
1881
if_index = (AvahiIfIndex) if_nametoindex(interface);
1882
if(if_index == 0){
1883
fprintf(stderr, "Mandos plugin mandos-client: "
1884
"No such interface: \"%s\"\n", interface);
1885
exitcode = EX_UNAVAILABLE;
1886
goto end;
1887
}
1888
1889
if(quit_now){
1890
goto end;
1891
}
1892
1893
/* Re-raise priviliges */
1894
errno = 0;
1895
ret = seteuid(0);
1896
if(ret == -1){
1897
perror_plus("seteuid");
1898
}
1899
1063
1900
#ifdef __linux__
1064
1901
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1065
messages to mess up the prompt */
1902
messages about the network interface to mess up the prompt */
1066
1903
ret = klogctl(8, NULL, 5);
1067
1904
bool restore_loglevel = true;
1068
1905
if(ret == -1){
1069
1906
restore_loglevel = false;
1070
perror("klogctl");
1907
perror_plus("klogctl");
1071
1908
}
1072
1909
#endif /* __linux__ */
1073
1910
1074
1911
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1075
1912
if(sd < 0){
1076
perror("socket");
1077
exitcode = EXIT_FAILURE;
1913
perror_plus("socket");
1914
exitcode = EX_OSERR;
1078
1915
#ifdef __linux__
1079
1916
if(restore_loglevel){
1080
1917
ret = klogctl(7, NULL, 0);
1081
1918
if(ret == -1){
1082
perror("klogctl");
1919
perror_plus("klogctl");
1083
1920
}
1084
1921
}
1085
1922
#endif /* __linux__ */
1923
/* Lower privileges */
1924
errno = 0;
1925
ret = seteuid(uid);
1926
if(ret == -1){
1927
perror_plus("seteuid");
1928
}
1086
1929
goto end;
1087
1930
}
1088
1931
strcpy(network.ifr_name, interface);
1089
1932
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1090
1933
if(ret == -1){
1091
perror("ioctl SIOCGIFFLAGS");
1934
perror_plus("ioctl SIOCGIFFLAGS");
1092
1935
#ifdef __linux__
1093
1936
if(restore_loglevel){
1094
1937
ret = klogctl(7, NULL, 0);
1095
1938
if(ret == -1){
1096
perror("klogctl");
1939
perror_plus("klogctl");
1097
1940
}
1098
1941
}
1099
1942
#endif /* __linux__ */
1100
exitcode = EXIT_FAILURE;
1943
exitcode = EX_OSERR;
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1101
1950
goto end;
1102
1951
}
1103
1952
if((network.ifr_flags & IFF_UP) == 0){
1104
1953
network.ifr_flags |= IFF_UP;
1954
take_down_interface = true;
1105
1955
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1106
1956
if(ret == -1){
1107
perror("ioctl SIOCSIFFLAGS");
1108
exitcode = EXIT_FAILURE;
1957
take_down_interface = false;
1958
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1959
exitcode = EX_OSERR;
1109
1960
#ifdef __linux__
1110
1961
if(restore_loglevel){
1111
1962
ret = klogctl(7, NULL, 0);
1112
1963
if(ret == -1){
1113
perror("klogctl");
1964
perror_plus("klogctl");
1114
1965
}
1115
1966
}
1116
1967
#endif /* __linux__ */
1968
/* Lower privileges */
1969
errno = 0;
1970
ret = seteuid(uid);
1971
if(ret == -1){
1972
perror_plus("seteuid");
1973
}
1117
1974
goto end;
1118
1975
}
1119
1976
}
1120
/* sleep checking until interface is running */
1977
/* Sleep checking until interface is running.
1978
Check every 0.25s, up to total time of delay */
1121
1979
for(int i=0; i < delay * 4; i++){
1122
1980
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1123
1981
if(ret == -1){
1124
perror("ioctl SIOCGIFFLAGS");
1982
perror_plus("ioctl SIOCGIFFLAGS");
1125
1983
} else if(network.ifr_flags & IFF_RUNNING){
1126
1984
break;
1127
1985
}
1128
1986
struct timespec sleeptime = { .tv_nsec = 250000000 };
1129
1987
ret = nanosleep(&sleeptime, NULL);
1130
1988
if(ret == -1 and errno != EINTR){
1131
perror("nanosleep");
1989
perror_plus("nanosleep");
1132
1990
}
1133
1991
}
1134
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1135
if(ret == -1){
1136
perror("close");
1992
if(not take_down_interface){
1993
/* We won't need the socket anymore */
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1137
1998
}
1138
1999
#ifdef __linux__
1139
2000
if(restore_loglevel){
1140
2001
/* Restores kernel loglevel to default */
1141
2002
ret = klogctl(7, NULL, 0);
1142
2003
if(ret == -1){
1143
perror("klogctl");
2004
perror_plus("klogctl");
1144
2005
}
1145
2006
}
1146
2007
#endif /* __linux__ */
1147
}
1148
1149
uid = getuid();
1150
gid = getgid();
1151
1152
errno = 0;
1153
setgid(gid);
1154
if(ret == -1){
1155
perror("setgid");
1156
}
1157
1158
ret = setuid(uid);
1159
if(ret == -1){
1160
perror("setuid");
2008
/* Lower privileges */
2009
errno = 0;
2010
if(take_down_interface){
2011
/* Lower privileges */
2012
ret = seteuid(uid);
2013
if(ret == -1){
2014
perror_plus("seteuid");
2015
}
2016
} else {
2017
/* Lower privileges permanently */
2018
ret = setuid(uid);
2019
if(ret == -1){
2020
perror_plus("setuid");
2021
}
2022
}
2023
}
2024
2025
if(quit_now){
2026
goto end;
1161
2027
}
1162
2028
1163
2029
ret = init_gnutls_global(pubkey, seckey);
1164
2030
if(ret == -1){
1165
fprintf(stderr, "init_gnutls_global failed\n");
1166
exitcode = EXIT_FAILURE;
2031
fprintf(stderr, "Mandos plugin mandos-client: "
2032
"init_gnutls_global failed\n");
2033
exitcode = EX_UNAVAILABLE;
1167
2034
goto end;
1168
2035
} else {
1169
2036
gnutls_initialized = true;
1170
2037
}
1171
2038
2039
if(quit_now){
2040
goto end;
2041
}
2042
1172
2043
if(mkdtemp(tempdir) == NULL){
1173
perror("mkdtemp");
2044
perror_plus("mkdtemp");
1174
2045
goto end;
1175
2046
}
1176
2047
tempdir_created = true;
1177
2048
2049
if(quit_now){
2050
goto end;
2051
}
2052
1178
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
1179
fprintf(stderr, "init_gpgme failed\n");
1180
exitcode = EXIT_FAILURE;
2054
fprintf(stderr, "Mandos plugin mandos-client: "
2055
"init_gpgme failed\n");
2056
exitcode = EX_UNAVAILABLE;
1181
2057
goto end;
1182
2058
} else {
1183
2059
gpgme_initialized = true;
1184
2060
}
1185
2061
1186
if(interface[0] != '\0'){
1187
if_index = (AvahiIfIndex) if_nametoindex(interface);
1188
if(if_index == 0){
1189
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1190
exitcode = EXIT_FAILURE;
1191
goto end;
1192
}
2062
if(quit_now){
2063
goto end;
1193
2064
}
1194
2065
1195
2066
if(connect_to != NULL){
1197
2068
/* (Mainly meant for debugging) */
1198
2069
char *address = strrchr(connect_to, ':');
1199
2070
if(address == NULL){
1200
fprintf(stderr, "No colon in address\n");
1201
exitcode = EXIT_FAILURE;
1202
goto end;
1203
}
2071
fprintf(stderr, "Mandos plugin mandos-client: "
2072
"No colon in address\n");
2073
exitcode = EX_USAGE;
2074
goto end;
2075
}
2076
2077
if(quit_now){
2078
goto end;
2079
}
2080
1204
2081
uint16_t port;
1205
2082
errno = 0;
1206
2083
tmpmax = strtoimax(address+1, &tmp, 10);
1207
2084
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1208
2085
or tmpmax != (uint16_t)tmpmax){
1209
fprintf(stderr, "Bad port number\n");
1210
exitcode = EXIT_FAILURE;
1211
goto end;
1212
}
2086
fprintf(stderr, "Mandos plugin mandos-client: "
2087
"Bad port number\n");
2088
exitcode = EX_USAGE;
2089
goto end;
2090
}
2091
2092
if(quit_now){
2093
goto end;
2094
}
2095
1213
2096
port = (uint16_t)tmpmax;
1214
2097
*address = '\0';
1215
address = connect_to;
1216
2098
/* Colon in address indicates IPv6 */
1217
2099
int af;
1218
if(strchr(address, ':') != NULL){
2100
if(strchr(connect_to, ':') != NULL){
1219
2101
af = AF_INET6;
2102
/* Accept [] around IPv6 address - see RFC 5952 */
2103
if(connect_to[0] == '[' and address[-1] == ']')
2104
{
2105
connect_to++;
2106
address[-1] = '\0';
2107
}
1220
2108
} else {
1221
2109
af = AF_INET;
1222
2110
}
1223
ret = start_mandos_communication(address, port, if_index, af);
1224
if(ret < 0){
1225
exitcode = EXIT_FAILURE;
1226
} else {
2111
address = connect_to;
2112
2113
if(quit_now){
2114
goto end;
2115
}
2116
2117
while(not quit_now){
2118
ret = start_mandos_communication(address, port, if_index, af);
2119
if(quit_now or ret == 0){
2120
break;
2121
}
2122
if(debug){
2123
fprintf(stderr, "Mandos plugin mandos-client: "
2124
"Retrying in %d seconds\n", (int)retry_interval);
2125
}
2126
sleep((int)retry_interval);
2127
}
2128
2129
if (not quit_now){
1227
2130
exitcode = EXIT_SUCCESS;
1228
2131
}
1229
goto end;
1230
}
1231
2132
2133
goto end;
2134
}
2135
2136
if(quit_now){
2137
goto end;
2138
}
2139
1232
2140
{
1233
2141
AvahiServerConfig config;
1234
2142
/* Do not publish any local Zeroconf records */
1249
2157
1250
2158
/* Check if creating the Avahi server object succeeded */
1251
2159
if(mc.server == NULL){
1252
fprintf(stderr, "Failed to create Avahi server: %s\n",
2160
fprintf(stderr, "Mandos plugin mandos-client: "
2161
"Failed to create Avahi server: %s\n",
1253
2162
avahi_strerror(error));
1254
exitcode = EXIT_FAILURE;
2163
exitcode = EX_UNAVAILABLE;
2164
goto end;
2165
}
2166
2167
if(quit_now){
1255
2168
goto end;
1256
2169
}
1257
2170
1258
2171
/* Create the Avahi service browser */
1259
2172
sb = avahi_s_service_browser_new(mc.server, if_index,
1260
AVAHI_PROTO_INET6, "_mandos._tcp",
2173
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1261
2174
NULL, 0, browse_callback, NULL);
1262
2175
if(sb == NULL){
1263
fprintf(stderr, "Failed to create service browser: %s\n",
2176
fprintf(stderr, "Mandos plugin mandos-client: "
2177
"Failed to create service browser: %s\n",
1264
2178
avahi_strerror(avahi_server_errno(mc.server)));
1265
exitcode = EXIT_FAILURE;
2179
exitcode = EX_UNAVAILABLE;
2180
goto end;
2181
}
2182
2183
if(quit_now){
1266
2184
goto end;
1267
2185
}
1268
2186
1269
2187
/* Run the main loop */
1270
2188
1271
2189
if(debug){
1272
fprintf(stderr, "Starting Avahi loop search\n");
1273
}
1274
1275
avahi_simple_poll_loop(mc.simple_poll);
2190
fprintf(stderr, "Mandos plugin mandos-client: "
2191
"Starting Avahi loop search\n");
2192
}
2193
2194
ret = avahi_loop_with_timeout(mc.simple_poll,
2195
(int)(retry_interval * 1000));
2196
if(debug){
2197
fprintf(stderr, "Mandos plugin mandos-client: "
2198
"avahi_loop_with_timeout exited %s\n",
2199
(ret == 0) ? "successfully" : "with error");
2200
}
1276
2201
1277
2202
end:
1278
2203
1279
2204
if(debug){
1280
fprintf(stderr, "%s exiting\n", argv[0]);
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"%s exiting\n", argv[0]);
1281
2207
}
1282
2208
1283
2209
/* Cleanup things */
1299
2225
if(gpgme_initialized){
1300
2226
gpgme_release(mc.ctx);
1301
2227
}
1302
1303
/* Removes the temp directory used by GPGME */
2228
2229
/* Cleans up the circular linked list of Mandos servers the client
2230
has seen */
2231
if(mc.current_server != NULL){
2232
mc.current_server->prev->next = NULL;
2233
while(mc.current_server != NULL){
2234
server *next = mc.current_server->next;
2235
free(mc.current_server);
2236
mc.current_server = next;
2237
}
2238
}
2239
2240
/* XXX run network hooks "stop" here */
2241
2242
/* Take down the network interface */
2243
if(take_down_interface){
2244
/* Re-raise priviliges */
2245
errno = 0;
2246
ret = seteuid(0);
2247
if(ret == -1){
2248
perror_plus("seteuid");
2249
}
2250
if(geteuid() == 0){
2251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCGIFFLAGS");
2254
} else if(network.ifr_flags & IFF_UP){
2255
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2256
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2257
if(ret == -1){
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2259
}
2260
}
2261
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2262
if(ret == -1){
2263
perror_plus("close");
2264
}
2265
/* Lower privileges permanently */
2266
errno = 0;
2267
ret = setuid(uid);
2268
if(ret == -1){
2269
perror_plus("setuid");
2270
}
2271
}
2272
}
2273
2274
/* Removes the GPGME temp directory and all files inside */
1304
2275
if(tempdir_created){
1305
DIR *d;
1306
struct dirent *direntry;
1307
d = opendir(tempdir);
1308
if(d == NULL){
1309
if(errno != ENOENT){
1310
perror("opendir");
1311
}
1312
} else {
1313
while(true){
1314
direntry = readdir(d);
1315
if(direntry == NULL){
1316
break;
1317
}
1318
/* Skip "." and ".." */
1319
if(direntry->d_name[0] == '.'
1320
and (direntry->d_name[1] == '\0'
1321
or (direntry->d_name[1] == '.'
1322
and direntry->d_name[2] == '\0'))){
1323
continue;
1324
}
2276
struct dirent **direntries = NULL;
2277
struct dirent *direntry = NULL;
2278
int numentries = scandir(tempdir, &direntries, notdotentries,
2279
alphasort);
2280
if (numentries > 0){
2281
for(int i = 0; i < numentries; i++){
2282
direntry = direntries[i];
1325
2283
char *fullname = NULL;
1326
2284
ret = asprintf(&fullname, "%s/%s", tempdir,
1327
2285
direntry->d_name);
1328
2286
if(ret < 0){
1329
perror("asprintf");
2287
perror_plus("asprintf");
1330
2288
continue;
1331
2289
}
1332
2290
ret = remove(fullname);
1333
2291
if(ret == -1){
1334
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1335
strerror(errno));
2292
fprintf(stderr, "Mandos plugin mandos-client: "
2293
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1336
2294
}
1337
2295
free(fullname);
1338
2296
}
1339
closedir(d);
2297
}
2298
2299
/* need to clean even if 0 because man page doesn't specify */
2300
free(direntries);
2301
if (numentries == -1){
2302
perror_plus("scandir");
1340
2303
}
1341
2304
ret = rmdir(tempdir);
1342
2305
if(ret == -1 and errno != ENOENT){
1343
perror("rmdir");
1344
}
2306
perror_plus("rmdir");
2307
}
2308
}
2309
2310
if(quit_now){
2311
sigemptyset(&old_sigterm_action.sa_mask);
2312
old_sigterm_action.sa_handler = SIG_DFL;
2313
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2314
&old_sigterm_action,
2315
NULL));
2316
if(ret == -1){
2317
perror_plus("sigaction");
2318
}
2319
do {
2320
ret = raise(signal_received);
2321
} while(ret != 0 and errno == EINTR);
2322
if(ret != 0){
2323
perror_plus("raise");
2324
abort();
2325
}
2326
TEMP_FAILURE_RETRY(pause());
1345
2327
}
1346
2328
1347
2329
return exitcode;
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Version: 2.0.2.dev0