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237.2.116
(compared to revision 237.15.5)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-08-27 23:12:09 UTC
- mto: (24.1.139 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090827231209-ry9loqws0gr7ze4g
* plugins.d/mandos-client.c (quit_now): Move up declaration before
first use.
(resolve_callback, ): Check "quit_now" flag.
(main): Renamed "interface_taken_up" to "take_down_interface" for
clarity. Check existence of interface before taking it up.
Set "take_down_interface" and "tempdir_created" flags before
any action is taken, to make sure cleanup is never missed.
Check "quit_now" flag throughout.
first use.
(resolve_callback, ): Check "quit_now" flag.
(main): Renamed "interface_taken_up" to "take_down_interface" for
clarity. Check existence of interface before taking it up.
Set "take_down_interface" and "tempdir_created" flags before
any action is taken, to make sure cleanup is never missed.
Check "quit_now" flag throughout.
- files removed:
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
72
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
81
80
argp_parse(), ARGP_KEY_ARG,
82
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
90
85
91
86
#ifdef __linux__
92
87
#include <sys/klog.h> /* klogctl() */
110
105
init_gnutls_session(),
111
106
GNUTLS_* */
112
107
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
115
110
116
111
/* GPGME */
117
112
#include <gpgme.h> /* All GPGME types, constants and
125
120
#define PATHDIR "/conf/conf.d/mandos"
126
121
#define SECKEY "seckey.txt"
127
122
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
123
130
124
bool debug = false;
131
125
static const char mandos_protocol_version[] = "1";
132
126
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
128
149
129
/* Used for passing in values through the Avahi callback functions */
150
130
typedef struct {
155
135
gnutls_dh_params_t dh_params;
156
136
const char *priority;
157
137
gpgme_ctx_t ctx;
158
server *current_server;
159
138
} mandos_context;
160
139
161
140
/* global context so signal handler can reach it*/
162
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
142
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
166
167
sig_atomic_t quit_now = 0;
168
int signal_received = 0;
169
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
177
int fprintf_plus(FILE *stream, const char *format, ...){
178
va_list ap;
179
va_start (ap, format);
180
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
184
144
185
145
/*
186
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
188
148
* "buffer_length" is how much is already used.
189
149
*/
190
150
size_t incbuffer(char **buffer, size_t buffer_length,
191
size_t buffer_capacity){
151
size_t buffer_capacity){
192
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
193
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
154
if(buffer == NULL){
199
159
return buffer_capacity;
200
160
}
201
161
202
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
205
int ret;
206
server *new_server = malloc(sizeof(server));
207
if(new_server == NULL){
208
perror_plus("malloc");
209
return -1;
210
}
211
*new_server = (server){ .ip = strdup(ip),
212
.port = port,
213
.if_index = if_index,
214
.af = af };
215
if(new_server->ip == NULL){
216
perror_plus("strdup");
217
return -1;
218
}
219
/* Special case of first server */
220
if (mc.current_server == NULL){
221
new_server->next = new_server;
222
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
225
} else {
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
228
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
237
}
238
239
162
/*
240
163
* Initialize GPGME.
241
164
*/
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
244
168
gpgme_error_t rc;
245
169
gpgme_engine_info_t engine_info;
246
170
249
173
* Helper function to insert pub and seckey to the engine keyring.
250
174
*/
251
175
bool import_key(const char *filename){
252
int ret;
253
176
int fd;
254
177
gpgme_data_t pgp_data;
255
178
256
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
257
180
if(fd == -1){
258
perror_plus("open");
181
perror("open");
259
182
return false;
260
183
}
261
184
262
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
186
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_data_new_from_fd: %s: %s\n",
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
188
gpgme_strsource(rc), gpgme_strerror(rc));
267
189
return false;
268
190
}
269
191
270
192
rc = gpgme_op_import(mc.ctx, pgp_data);
271
193
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "Mandos plugin mandos-client: "
273
"bad gpgme_op_import: %s: %s\n",
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
274
195
gpgme_strsource(rc), gpgme_strerror(rc));
275
196
return false;
276
197
}
277
198
278
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
200
if(ret == -1){
280
perror_plus("close");
201
perror("close");
281
202
}
282
203
gpgme_data_release(pgp_data);
283
204
return true;
284
205
}
285
206
286
207
if(debug){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
289
209
}
290
210
291
211
/* Init GPGME */
292
212
gpgme_check_version(NULL);
293
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
294
214
if(rc != GPG_ERR_NO_ERROR){
295
fprintf(stderr, "Mandos plugin mandos-client: "
296
"bad gpgme_engine_check_version: %s: %s\n",
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
297
216
gpgme_strsource(rc), gpgme_strerror(rc));
298
217
return false;
299
218
}
300
219
301
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
302
221
rc = gpgme_get_engine_info(&engine_info);
303
222
if(rc != GPG_ERR_NO_ERROR){
304
fprintf(stderr, "Mandos plugin mandos-client: "
305
"bad gpgme_get_engine_info: %s: %s\n",
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
224
gpgme_strsource(rc), gpgme_strerror(rc));
307
225
return false;
308
226
}
315
233
engine_info = engine_info->next;
316
234
}
317
235
if(engine_info == NULL){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"Could not set GPGME home dir to %s\n", tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
237
return false;
321
238
}
322
239
323
240
/* Create new GPGME "context" */
324
241
rc = gpgme_new(&(mc.ctx));
325
242
if(rc != GPG_ERR_NO_ERROR){
326
fprintf(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
329
245
return false;
330
246
}
331
247
333
249
return false;
334
250
}
335
251
336
return true;
252
return true;
337
253
}
338
254
339
255
/*
350
266
ssize_t plaintext_length = 0;
351
267
352
268
if(debug){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
355
270
}
356
271
357
272
/* Create new GPGME data buffer from memory cryptotext */
358
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
359
274
0);
360
275
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "Mandos plugin mandos-client: "
362
"bad gpgme_data_new_from_mem: %s: %s\n",
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
277
gpgme_strsource(rc), gpgme_strerror(rc));
364
278
return -1;
365
279
}
367
281
/* Create new empty GPGME data buffer for the plaintext */
368
282
rc = gpgme_data_new(&dh_plain);
369
283
if(rc != GPG_ERR_NO_ERROR){
370
fprintf(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
372
285
gpgme_strsource(rc), gpgme_strerror(rc));
373
286
gpgme_data_release(dh_crypto);
374
287
return -1;
378
291
data buffer */
379
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
293
if(rc != GPG_ERR_NO_ERROR){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
295
gpgme_strsource(rc), gpgme_strerror(rc));
384
296
plaintext_length = -1;
385
297
if(debug){
386
298
gpgme_decrypt_result_t result;
387
299
result = gpgme_op_decrypt_result(mc.ctx);
388
300
if(result == NULL){
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
391
302
} else {
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
303
fprintf(stderr, "Unsupported algorithm: %s\n",
394
304
result->unsupported_algorithm);
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
305
fprintf(stderr, "Wrong key usage: %u\n",
397
306
result->wrong_key_usage);
398
307
if(result->file_name != NULL){
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
401
309
}
402
310
gpgme_recipient_t recipient;
403
311
recipient = result->recipients;
404
312
while(recipient != NULL){
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
313
fprintf(stderr, "Public key algorithm: %s\n",
407
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
412
317
recipient->status == GPG_ERR_NO_SECKEY
413
318
? "No" : "Yes");
414
319
recipient = recipient->next;
419
324
}
420
325
421
326
if(debug){
422
fprintf(stderr, "Mandos plugin mandos-client: "
423
"Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
424
328
}
425
329
426
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
427
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
428
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
429
333
plaintext_length = -1;
430
334
goto decrypt_end;
431
335
}
433
337
*plaintext = NULL;
434
338
while(true){
435
339
plaintext_capacity = incbuffer(plaintext,
436
(size_t)plaintext_length,
437
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
438
342
if(plaintext_capacity == 0){
439
perror_plus("incbuffer");
440
plaintext_length = -1;
441
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
442
346
}
443
347
444
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
449
353
break;
450
354
}
451
355
if(ret < 0){
452
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
453
357
plaintext_length = -1;
454
358
goto decrypt_end;
455
359
}
457
361
}
458
362
459
363
if(debug){
460
fprintf(stderr, "Mandos plugin mandos-client: "
461
"Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
462
365
for(ssize_t i = 0; i < plaintext_length; i++){
463
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
464
367
}
486
389
/* GnuTLS log function callback */
487
390
static void debuggnutls(__attribute__((unused)) int level,
488
391
const char* string){
489
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
490
393
}
491
394
492
395
static int init_gnutls_global(const char *pubkeyfilename,
494
397
int ret;
495
398
496
399
if(debug){
497
fprintf(stderr, "Mandos plugin mandos-client: "
498
"Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
499
401
}
500
402
501
403
ret = gnutls_global_init();
502
404
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Mandos plugin mandos-client: "
504
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
505
407
return -1;
506
408
}
507
409
514
416
}
515
417
516
418
/* OpenPGP credentials */
517
ret = gnutls_certificate_allocate_credentials(&mc.cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
518
420
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
521
426
gnutls_global_deinit();
522
427
return -1;
523
428
}
524
429
525
430
if(debug){
526
fprintf(stderr, "Mandos plugin mandos-client: "
527
"Attempting to use OpenPGP public key %s and"
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
528
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
529
433
seckeyfilename);
530
434
}
534
438
GNUTLS_OPENPGP_FMT_BASE64);
535
439
if(ret != GNUTLS_E_SUCCESS){
536
440
fprintf(stderr,
537
"Mandos plugin mandos-client: "
538
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
539
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
542
445
goto globalfail;
543
446
}
544
447
545
448
/* GnuTLS server initialization */
546
449
ret = gnutls_dh_params_init(&mc.dh_params);
547
450
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS DH parameter initialization:"
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
550
452
" %s\n", safer_gnutls_strerror(ret));
551
453
goto globalfail;
552
454
}
553
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
554
456
if(ret != GNUTLS_E_SUCCESS){
555
fprintf(stderr, "Mandos plugin mandos-client: "
556
"Error in GnuTLS prime generation: %s\n",
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
557
458
safer_gnutls_strerror(ret));
558
459
goto globalfail;
559
460
}
573
474
static int init_gnutls_session(gnutls_session_t *session){
574
475
int ret;
575
476
/* GnuTLS session creation */
576
do {
577
ret = gnutls_init(session, GNUTLS_SERVER);
578
if(quit_now){
579
return -1;
580
}
581
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_init(session, GNUTLS_SERVER);
582
478
if(ret != GNUTLS_E_SUCCESS){
583
fprintf(stderr, "Mandos plugin mandos-client: "
584
"Error in GnuTLS session initialization: %s\n",
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
585
480
safer_gnutls_strerror(ret));
586
481
}
587
482
588
483
{
589
484
const char *err;
590
do {
591
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
592
if(quit_now){
593
gnutls_deinit(*session);
594
return -1;
595
}
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
597
486
if(ret != GNUTLS_E_SUCCESS){
598
fprintf(stderr, "Mandos plugin mandos-client: "
599
"Syntax error at: %s\n", err);
600
fprintf(stderr, "Mandos plugin mandos-client: "
601
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
602
490
gnutls_deinit(*session);
603
491
return -1;
604
492
}
605
493
}
606
494
607
do {
608
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
609
mc.cred);
610
if(quit_now){
611
gnutls_deinit(*session);
612
return -1;
613
}
614
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
615
497
if(ret != GNUTLS_E_SUCCESS){
616
fprintf(stderr, "Mandos plugin mandos-client: "
617
"Error setting GnuTLS credentials: %s\n",
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
618
499
safer_gnutls_strerror(ret));
619
500
gnutls_deinit(*session);
620
501
return -1;
621
502
}
622
503
623
504
/* ignore client certificate if any. */
624
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
625
507
626
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
627
509
636
518
static int start_mandos_communication(const char *ip, uint16_t port,
637
519
AvahiIfIndex if_index,
638
520
int af){
639
int ret, tcp_sd = -1;
521
int ret, tcp_sd;
640
522
ssize_t sret;
641
523
union {
642
524
struct sockaddr_in in;
643
525
struct sockaddr_in6 in6;
644
526
} to;
645
527
char *buffer = NULL;
646
char *decrypted_buffer = NULL;
528
char *decrypted_buffer;
647
529
size_t buffer_length = 0;
648
530
size_t buffer_capacity = 0;
531
ssize_t decrypted_buffer_size;
649
532
size_t written;
650
int retval = -1;
533
int retval = 0;
651
534
gnutls_session_t session;
652
535
int pf; /* Protocol family */
653
536
654
errno = 0;
655
656
if(quit_now){
657
errno = EINTR;
658
return -1;
659
}
660
661
537
switch(af){
662
538
case AF_INET6:
663
539
pf = PF_INET6;
666
542
pf = PF_INET;
667
543
break;
668
544
default:
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
671
errno = EINVAL;
545
fprintf(stderr, "Bad address family: %d\n", af);
672
546
return -1;
673
547
}
674
548
678
552
}
679
553
680
554
if(debug){
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
555
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
683
556
"\n", ip, port);
684
557
}
685
558
686
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
687
560
if(tcp_sd < 0){
688
int e = errno;
689
perror_plus("socket");
690
errno = e;
691
goto mandos_end;
692
}
693
694
if(quit_now){
695
errno = EINTR;
696
goto mandos_end;
561
perror("socket");
562
return -1;
697
563
}
698
564
699
565
memset(&to, 0, sizeof(to));
705
571
ret = inet_pton(af, ip, &to.in.sin_addr);
706
572
}
707
573
if(ret < 0 ){
708
int e = errno;
709
perror_plus("inet_pton");
710
errno = e;
711
goto mandos_end;
574
perror("inet_pton");
575
return -1;
712
576
}
713
577
if(ret == 0){
714
int e = errno;
715
fprintf(stderr, "Mandos plugin mandos-client: "
716
"Bad address: %s\n", ip);
717
errno = e;
718
goto mandos_end;
578
fprintf(stderr, "Bad address: %s\n", ip);
579
return -1;
719
580
}
720
581
if(af == AF_INET6){
721
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
724
585
725
586
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
726
587
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
727
-Wunreachable-code*/
588
-Wunreachable-code*/
728
589
if(if_index == AVAHI_IF_UNSPEC){
729
fprintf(stderr, "Mandos plugin mandos-client: "
730
"An IPv6 link-local address is incomplete"
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
731
591
" without a network interface\n");
732
errno = EINVAL;
733
goto mandos_end;
592
return -1;
734
593
}
735
594
/* Set the network interface number as scope */
736
595
to.in6.sin6_scope_id = (uint32_t)if_index;
741
600
-Wunreachable-code */
742
601
}
743
602
744
if(quit_now){
745
errno = EINTR;
746
goto mandos_end;
747
}
748
749
603
if(debug){
750
604
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
751
605
char interface[IF_NAMESIZE];
752
606
if(if_indextoname((unsigned int)if_index, interface) == NULL){
753
perror_plus("if_indextoname");
607
perror("if_indextoname");
754
608
} else {
755
fprintf(stderr, "Mandos plugin mandos-client: "
756
"Connection to: %s%%%s, port %" PRIu16 "\n",
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
757
610
ip, interface, port);
758
611
}
759
612
} else {
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
613
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
port);
762
615
}
763
616
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
764
617
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
771
624
sizeof(addrstr));
772
625
}
773
626
if(pcret == NULL){
774
perror_plus("inet_ntop");
627
perror("inet_ntop");
775
628
} else {
776
629
if(strcmp(addrstr, ip) != 0){
777
fprintf(stderr, "Mandos plugin mandos-client: "
778
"Canonical address form: %s\n", addrstr);
630
fprintf(stderr, "Canonical address form: %s\n", addrstr);
779
631
}
780
632
}
781
633
}
782
634
783
if(quit_now){
784
errno = EINTR;
785
goto mandos_end;
786
}
787
788
635
if(af == AF_INET6){
789
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
790
637
} else {
791
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
792
639
}
793
640
if(ret < 0){
794
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
795
int e = errno;
796
perror_plus("connect");
797
errno = e;
798
}
799
goto mandos_end;
800
}
801
802
if(quit_now){
803
errno = EINTR;
804
goto mandos_end;
641
perror("connect");
642
return -1;
805
643
}
806
644
807
645
const char *out = mandos_protocol_version;
809
647
while(true){
810
648
size_t out_size = strlen(out);
811
649
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
812
out_size - written));
650
out_size - written));
813
651
if(ret == -1){
814
int e = errno;
815
perror_plus("write");
816
errno = e;
652
perror("write");
653
retval = -1;
817
654
goto mandos_end;
818
655
}
819
656
written += (size_t)ret;
827
664
break;
828
665
}
829
666
}
830
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
834
}
835
667
}
836
668
837
669
if(debug){
838
fprintf(stderr, "Mandos plugin mandos-client: "
839
"Establishing TLS session with %s\n", ip);
840
}
841
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
/* Spurious warning from -Wint-to-pointer-cast */
670
fprintf(stderr, "Establishing TLS session with %s\n", ip);
671
}
672
848
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
849
674
850
if(quit_now){
851
errno = EINTR;
852
goto mandos_end;
853
}
854
855
do {
675
do{
856
676
ret = gnutls_handshake(session);
857
if(quit_now){
858
errno = EINTR;
859
goto mandos_end;
860
}
861
677
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
862
678
863
679
if(ret != GNUTLS_E_SUCCESS){
864
680
if(debug){
865
fprintf(stderr, "Mandos plugin mandos-client: "
866
"*** GnuTLS Handshake failed ***\n");
681
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
867
682
gnutls_perror(ret);
868
683
}
869
errno = EPROTO;
684
retval = -1;
870
685
goto mandos_end;
871
686
}
872
687
873
688
/* Read OpenPGP packet that contains the wanted password */
874
689
875
690
if(debug){
876
fprintf(stderr, "Mandos plugin mandos-client: "
877
"Retrieving OpenPGP encrypted password from %s\n", ip);
691
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
692
ip);
878
693
}
879
694
880
695
while(true){
881
882
if(quit_now){
883
errno = EINTR;
884
goto mandos_end;
885
}
886
887
696
buffer_capacity = incbuffer(&buffer, buffer_length,
888
buffer_capacity);
697
buffer_capacity);
889
698
if(buffer_capacity == 0){
890
int e = errno;
891
perror_plus("incbuffer");
892
errno = e;
893
goto mandos_end;
894
}
895
896
if(quit_now){
897
errno = EINTR;
699
perror("incbuffer");
700
retval = -1;
898
701
goto mandos_end;
899
702
}
900
703
909
712
case GNUTLS_E_AGAIN:
910
713
break;
911
714
case GNUTLS_E_REHANDSHAKE:
912
do {
715
do{
913
716
ret = gnutls_handshake(session);
914
915
if(quit_now){
916
errno = EINTR;
917
goto mandos_end;
918
}
919
717
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
920
718
if(ret < 0){
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"*** GnuTLS Re-handshake failed ***\n");
719
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
923
720
gnutls_perror(ret);
924
errno = EPROTO;
721
retval = -1;
925
722
goto mandos_end;
926
723
}
927
724
break;
928
725
default:
929
fprintf(stderr, "Mandos plugin mandos-client: "
930
"Unknown error while reading data from"
726
fprintf(stderr, "Unknown error while reading data from"
931
727
" encrypted session with Mandos server\n");
728
retval = -1;
932
729
gnutls_bye(session, GNUTLS_SHUT_RDWR);
933
errno = EIO;
934
730
goto mandos_end;
935
731
}
936
732
} else {
939
735
}
940
736
941
737
if(debug){
942
fprintf(stderr, "Mandos plugin mandos-client: "
943
"Closing TLS session\n");
944
}
945
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
951
do {
952
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
953
if(quit_now){
954
errno = EINTR;
955
goto mandos_end;
956
}
957
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
738
fprintf(stderr, "Closing TLS session\n");
739
}
740
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
958
742
959
743
if(buffer_length > 0){
960
ssize_t decrypted_buffer_size;
961
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
744
decrypted_buffer_size = pgp_packet_decrypt(buffer,
745
buffer_length,
962
746
&decrypted_buffer);
963
747
if(decrypted_buffer_size >= 0){
964
965
748
written = 0;
966
749
while(written < (size_t) decrypted_buffer_size){
967
if(quit_now){
968
errno = EINTR;
969
goto mandos_end;
970
}
971
972
750
ret = (int)fwrite(decrypted_buffer + written, 1,
973
751
(size_t)decrypted_buffer_size - written,
974
752
stdout);
975
753
if(ret == 0 and ferror(stdout)){
976
int e = errno;
977
754
if(debug){
978
fprintf(stderr, "Mandos plugin mandos-client: "
979
"Error writing encrypted data: %s\n",
755
fprintf(stderr, "Error writing encrypted data: %s\n",
980
756
strerror(errno));
981
757
}
982
errno = e;
983
goto mandos_end;
758
retval = -1;
759
break;
984
760
}
985
761
written += (size_t)ret;
986
762
}
987
retval = 0;
763
free(decrypted_buffer);
764
} else {
765
retval = -1;
988
766
}
767
} else {
768
retval = -1;
989
769
}
990
770
991
771
/* Shutdown procedure */
992
772
993
773
mandos_end:
994
{
995
int e = errno;
996
free(decrypted_buffer);
997
free(buffer);
998
if(tcp_sd >= 0){
999
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1000
}
1001
if(ret == -1){
1002
if(e == 0){
1003
e = errno;
1004
}
1005
perror_plus("close");
1006
}
1007
gnutls_deinit(session);
1008
errno = e;
1009
if(quit_now){
1010
errno = EINTR;
1011
retval = -1;
1012
}
774
free(buffer);
775
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
776
if(ret == -1){
777
perror("close");
1013
778
}
779
gnutls_deinit(session);
1014
780
return retval;
1015
781
}
1016
782
783
sig_atomic_t quit_now = 0;
784
1017
785
static void resolve_callback(AvahiSServiceResolver *r,
1018
786
AvahiIfIndex interface,
1019
787
AvahiProtocol proto,
1040
808
switch(event){
1041
809
default:
1042
810
case AVAHI_RESOLVER_FAILURE:
1043
fprintf(stderr, "Mandos plugin mandos-client: "
1044
"(Avahi Resolver) Failed to resolve service '%s'"
811
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1045
812
" of type '%s' in domain '%s': %s\n", name, type, domain,
1046
813
avahi_strerror(avahi_server_errno(mc.server)));
1047
814
break;
1051
818
char ip[AVAHI_ADDRESS_STR_MAX];
1052
819
avahi_address_snprint(ip, sizeof(ip), address);
1053
820
if(debug){
1054
fprintf(stderr, "Mandos plugin mandos-client: "
1055
"Mandos server \"%s\" found on %s (%s, %"
821
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1056
822
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1057
823
ip, (intmax_t)interface, port);
1058
824
}
1060
826
avahi_proto_to_af(proto));
1061
827
if(ret == 0){
1062
828
avahi_simple_poll_quit(mc.simple_poll);
1063
} else {
1064
ret = add_server(ip, port, interface,
1065
avahi_proto_to_af(proto));
1066
829
}
1067
830
}
1068
831
}
1084
847
/* Called whenever a new services becomes available on the LAN or
1085
848
is removed from the LAN */
1086
849
1087
if(quit_now){
1088
return;
1089
}
1090
1091
850
switch(event){
1092
851
default:
1093
852
case AVAHI_BROWSER_FAILURE:
1094
853
1095
fprintf(stderr, "Mandos plugin mandos-client: "
1096
"(Avahi browser) %s\n",
854
fprintf(stderr, "(Avahi browser) %s\n",
1097
855
avahi_strerror(avahi_server_errno(mc.server)));
1098
856
avahi_simple_poll_quit(mc.simple_poll);
1099
857
return;
1107
865
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1108
866
name, type, domain, protocol, 0,
1109
867
resolve_callback, NULL) == NULL)
1110
fprintf(stderr, "Mandos plugin mandos-client: "
1111
"Avahi: Failed to resolve service '%s': %s\n",
868
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1112
869
name, avahi_strerror(avahi_server_errno(mc.server)));
1113
870
break;
1114
871
1118
875
case AVAHI_BROWSER_ALL_FOR_NOW:
1119
876
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1120
877
if(debug){
1121
fprintf(stderr, "Mandos plugin mandos-client: "
1122
"No Mandos server found, still searching...\n");
878
fprintf(stderr, "No Mandos server found, still searching...\n");
1123
879
}
1124
880
break;
1125
881
}
1126
882
}
1127
883
1128
/* Signal handler that stops main loop after SIGTERM */
1129
static void handle_sigterm(int sig){
884
/* stop main loop after sigterm has been called */
885
static void handle_sigterm(__attribute__((unused)) int sig){
1130
886
if(quit_now){
1131
887
return;
1132
888
}
1133
889
quit_now = 1;
1134
signal_received = sig;
1135
890
int old_errno = errno;
1136
/* set main loop to exit */
1137
891
if(mc.simple_poll != NULL){
1138
892
avahi_simple_poll_quit(mc.simple_poll);
1139
893
}
1140
894
errno = old_errno;
1141
895
}
1142
896
1143
bool get_flags(const char *ifname, struct ifreq *ifr){
1144
int ret;
1145
1146
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1147
if(s < 0){
1148
perror_plus("socket");
1149
return false;
1150
}
1151
strcpy(ifr->ifr_name, ifname);
1152
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1153
if(ret == -1){
1154
if(debug){
1155
perror_plus("ioctl SIOCGIFFLAGS");
1156
}
1157
return false;
1158
}
1159
return true;
1160
}
1161
1162
bool good_flags(const char *ifname, const struct ifreq *ifr){
1163
1164
/* Reject the loopback device */
1165
if(ifr->ifr_flags & IFF_LOOPBACK){
1166
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1169
}
1170
return false;
1171
}
1172
/* Accept point-to-point devices only if connect_to is specified */
1173
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1174
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1177
}
1178
return true;
1179
}
1180
/* Otherwise, reject non-broadcast-capable devices */
1181
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1182
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1185
}
1186
return false;
1187
}
1188
/* Reject non-ARP interfaces (including dummy interfaces) */
1189
if(ifr->ifr_flags & IFF_NOARP){
1190
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1193
}
1194
return false;
1195
}
1196
1197
/* Accept this device */
1198
if(debug){
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1201
}
1202
return true;
1203
}
1204
1205
/*
1206
* This function determines if a directory entry in /sys/class/net
1207
* corresponds to an acceptable network device.
1208
* (This function is passed to scandir(3) as a filter function.)
1209
*/
1210
int good_interface(const struct dirent *if_entry){
1211
if(if_entry->d_name[0] == '.'){
1212
return 0;
1213
}
1214
1215
struct ifreq ifr;
1216
if(not get_flags(if_entry->d_name, &ifr)){
1217
if(debug){
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
if(not good_flags(if_entry->d_name, &ifr)){
1226
return 0;
1227
}
1228
return 1;
1229
}
1230
1231
/*
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1235
*/
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1238
return 0;
1239
}
1240
1241
struct ifreq ifr;
1242
if(not get_flags(if_entry->d_name, &ifr)){
1243
if(debug){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1246
if_entry->d_name);
1247
}
1248
return 0;
1249
}
1250
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1253
if(debug){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1256
if_entry->d_name);
1257
}
1258
return 0;
1259
}
1260
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1263
if(debug){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1266
if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1277
int notdotentries(const struct dirent *direntry){
1278
/* Skip "." and ".." */
1279
if(direntry->d_name[0] == '.'
1280
and (direntry->d_name[1] == '\0'
1281
or (direntry->d_name[1] == '.'
1282
and direntry->d_name[2] == '\0'))){
1283
return 0;
1284
}
1285
return 1;
1286
}
1287
1288
/* Is this directory entry a runnable program? */
1289
int runnable_hook(const struct dirent *direntry){
1290
int ret;
1291
size_t sret;
1292
struct stat st;
1293
1294
if((direntry->d_name)[0] == '\0'){
1295
/* Empty name? */
1296
return 0;
1297
}
1298
1299
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1300
"abcdefghijklmnopqrstuvwxyz"
1301
"0123456789"
1302
"_-");
1303
if((direntry->d_name)[sret] != '\0'){
1304
/* Contains non-allowed characters */
1305
if(debug){
1306
fprintf(stderr, "Mandos plugin mandos-client: "
1307
"Ignoring hook \"%s\" with bad name\n",
1308
direntry->d_name);
1309
}
1310
return 0;
1311
}
1312
1313
char *fullname = NULL;
1314
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1315
if(ret < 0){
1316
perror_plus("asprintf");
1317
return 0;
1318
}
1319
1320
ret = stat(fullname, &st);
1321
if(ret == -1){
1322
if(debug){
1323
perror_plus("Could not stat hook");
1324
}
1325
return 0;
1326
}
1327
if(not (S_ISREG(st.st_mode))){
1328
/* Not a regular file */
1329
if(debug){
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1332
direntry->d_name);
1333
}
1334
return 0;
1335
}
1336
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1337
/* Not executable */
1338
if(debug){
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1341
direntry->d_name);
1342
}
1343
return 0;
1344
}
1345
return 1;
1346
}
1347
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1349
int ret;
1350
struct timespec now;
1351
struct timespec waited_time;
1352
intmax_t block_time;
1353
1354
while(true){
1355
if(mc.current_server == NULL){
1356
if (debug){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1359
}
1360
ret = avahi_simple_poll_iterate(s, -1);
1361
} else {
1362
if (debug){
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1365
" or wait\n");
1366
}
1367
/* the current time */
1368
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1369
if(ret == -1){
1370
perror_plus("clock_gettime");
1371
return -1;
1372
}
1373
/* Calculating in ms how long time between now and server
1374
who we visted longest time ago. Now - last seen. */
1375
waited_time.tv_sec = (now.tv_sec
1376
- mc.current_server->last_seen.tv_sec);
1377
waited_time.tv_nsec = (now.tv_nsec
1378
- mc.current_server->last_seen.tv_nsec);
1379
/* total time is 10s/10,000ms.
1380
Converting to s from ms by dividing by 1,000,
1381
and ns to ms by dividing by 1,000,000. */
1382
block_time = ((retry_interval
1383
- ((intmax_t)waited_time.tv_sec * 1000))
1384
- ((intmax_t)waited_time.tv_nsec / 1000000));
1385
1386
if (debug){
1387
fprintf(stderr, "Mandos plugin mandos-client: "
1388
"Blocking for %" PRIdMAX " ms\n", block_time);
1389
}
1390
1391
if(block_time <= 0){
1392
ret = start_mandos_communication(mc.current_server->ip,
1393
mc.current_server->port,
1394
mc.current_server->if_index,
1395
mc.current_server->af);
1396
if(ret == 0){
1397
avahi_simple_poll_quit(mc.simple_poll);
1398
return 0;
1399
}
1400
ret = clock_gettime(CLOCK_MONOTONIC,
1401
&mc.current_server->last_seen);
1402
if(ret == -1){
1403
perror_plus("clock_gettime");
1404
return -1;
1405
}
1406
mc.current_server = mc.current_server->next;
1407
block_time = 0; /* Call avahi to find new Mandos
1408
servers, but don't block */
1409
}
1410
1411
ret = avahi_simple_poll_iterate(s, (int)block_time);
1412
}
1413
if(ret != 0){
1414
if (ret > 0 or errno != EINTR){
1415
return (ret != 1) ? ret : 0;
1416
}
1417
}
1418
}
1419
}
1420
1421
897
int main(int argc, char *argv[]){
1422
898
AvahiSServiceBrowser *sb = NULL;
1423
899
int error;
1425
901
intmax_t tmpmax;
1426
902
char *tmp;
1427
903
int exitcode = EXIT_SUCCESS;
1428
const char *interface = "";
904
const char *interface = "eth0";
1429
905
struct ifreq network;
1430
906
int sd = -1;
1431
907
bool take_down_interface = false;
1432
908
uid_t uid;
1433
909
gid_t gid;
910
char *connect_to = NULL;
1434
911
char tempdir[] = "/tmp/mandosXXXXXX";
1435
912
bool tempdir_created = false;
1436
913
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1440
917
bool gnutls_initialized = false;
1441
918
bool gpgme_initialized = false;
1442
919
float delay = 2.5f;
1443
double retry_interval = 10; /* 10s between trying a server and
1444
retrying the same server again */
1445
920
1446
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
921
struct sigaction old_sigterm_action;
1447
922
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1448
923
1449
uid = getuid();
1450
gid = getgid();
1451
1452
/* Lower any group privileges we might have, just to be safe */
1453
errno = 0;
1454
ret = setgid(gid);
1455
if(ret == -1){
1456
perror_plus("setgid");
1457
}
1458
1459
/* Lower user privileges (temporarily) */
1460
errno = 0;
1461
ret = seteuid(uid);
1462
if(ret == -1){
1463
perror_plus("seteuid");
1464
}
1465
1466
if(quit_now){
1467
goto end;
1468
}
1469
1470
924
{
1471
925
struct argp_option options[] = {
1472
926
{ .name = "debug", .key = 128,
1501
955
.arg = "SECONDS",
1502
956
.doc = "Maximum delay to wait for interface startup",
1503
957
.group = 2 },
1504
{ .name = "retry", .key = 132,
1505
.arg = "SECONDS",
1506
.doc = "Retry interval used when denied by the mandos server",
1507
.group = 2 },
1508
{ .name = "network-hook-dir", .key = 133,
1509
.arg = "DIR",
1510
.doc = "Directory where network hooks are located",
1511
.group = 2 },
1512
/*
1513
* These reproduce what we would get without ARGP_NO_HELP
1514
*/
1515
{ .name = "help", .key = '?',
1516
.doc = "Give this help list", .group = -1 },
1517
{ .name = "usage", .key = -3,
1518
.doc = "Give a short usage message", .group = -1 },
1519
{ .name = "version", .key = 'V',
1520
.doc = "Print program version", .group = -1 },
1521
958
{ .name = NULL }
1522
959
};
1523
960
1524
961
error_t parse_opt(int key, char *arg,
1525
962
struct argp_state *state){
1526
errno = 0;
1527
963
switch(key){
1528
964
case 128: /* --debug */
1529
965
debug = true;
1545
981
tmpmax = strtoimax(arg, &tmp, 10);
1546
982
if(errno != 0 or tmp == arg or *tmp != '\0'
1547
983
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1548
argp_error(state, "Bad number of DH bits");
984
fprintf(stderr, "Bad number of DH bits\n");
985
exit(EXIT_FAILURE);
1549
986
}
1550
987
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1551
988
break;
1556
993
errno = 0;
1557
994
delay = strtof(arg, &tmp);
1558
995
if(errno != 0 or tmp == arg or *tmp != '\0'){
1559
argp_error(state, "Bad delay");
1560
}
1561
case 132: /* --retry */
1562
errno = 0;
1563
retry_interval = strtod(arg, &tmp);
1564
if(errno != 0 or tmp == arg or *tmp != '\0'
1565
or (retry_interval * 1000) > INT_MAX
1566
or retry_interval < 0){
1567
argp_error(state, "Bad retry interval");
1568
}
1569
break;
1570
case 133: /* --network-hook-dir */
1571
hookdir = arg;
1572
break;
1573
/*
1574
* These reproduce what we would get without ARGP_NO_HELP
1575
*/
1576
case '?': /* --help */
1577
argp_state_help(state, state->out_stream,
1578
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1579
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1580
case -3: /* --usage */
1581
argp_state_help(state, state->out_stream,
1582
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1583
case 'V': /* --version */
1584
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1585
fprintf(state->out_stream, "%s\n", argp_program_version);
1586
exit(argp_err_exit_status);
996
fprintf(stderr, "Bad delay\n");
997
exit(EXIT_FAILURE);
998
}
999
break;
1000
case ARGP_KEY_ARG:
1001
argp_usage(state);
1002
case ARGP_KEY_END:
1587
1003
break;
1588
1004
default:
1589
1005
return ARGP_ERR_UNKNOWN;
1590
1006
}
1591
return errno;
1007
return 0;
1592
1008
}
1593
1009
1594
1010
struct argp argp = { .options = options, .parser = parse_opt,
1595
1011
.args_doc = "",
1596
1012
.doc = "Mandos client -- Get and decrypt"
1597
1013
" passwords from a Mandos server" };
1598
ret = argp_parse(&argp, argc, argv,
1599
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1600
switch(ret){
1601
case 0:
1602
break;
1603
case ENOMEM:
1604
default:
1605
errno = ret;
1606
perror_plus("argp_parse");
1607
exitcode = EX_OSERR;
1608
goto end;
1609
case EINVAL:
1610
exitcode = EX_USAGE;
1611
goto end;
1612
}
1613
}
1614
1615
{
1616
/* Work around Debian bug #633582:
1617
<http://bugs.debian.org/633582> */
1618
struct stat st;
1619
1620
/* Re-raise priviliges */
1621
errno = 0;
1622
ret = seteuid(0);
1623
if(ret == -1){
1624
perror_plus("seteuid");
1625
}
1626
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1631
} else {
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1633
if(ret == -1){
1634
perror_plus("fstat");
1635
} else {
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1638
if(ret == -1){
1639
perror_plus("fchown");
1640
}
1641
}
1642
}
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1644
}
1645
}
1646
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1651
} else {
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1653
if(ret == -1){
1654
perror_plus("fstat");
1655
} else {
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1658
if(ret == -1){
1659
perror_plus("fchown");
1660
}
1661
}
1662
}
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1664
}
1665
}
1666
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
}
1674
1675
/* Find network hooks and run them */
1676
{
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1680
alphasort);
1681
if(numhooks == -1){
1682
perror_plus("scandir");
1683
} else {
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1689
if(ret < 0){
1690
perror_plus("asprintf");
1691
continue;
1692
}
1693
pid_t hook_pid = fork();
1694
if(hook_pid == 0){
1695
/* Child */
1696
dup2(devnull, STDIN_FILENO);
1697
close(devnull);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1700
if(ret == -1){
1701
perror_plus("setenv");
1702
exit(1);
1703
}
1704
ret = setenv("DEVICE", interface, 1);
1705
if(ret == -1){
1706
perror_plus("setenv");
1707
exit(1);
1708
}
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1710
if(ret == -1){
1711
perror_plus("setenv");
1712
exit(1);
1713
}
1714
ret = setenv("MODE", "start", 1);
1715
if(ret == -1){
1716
perror_plus("setenv");
1717
exit(1);
1718
}
1719
char *delaystring;
1720
ret = asprintf(&delaystring, "%f", delay);
1721
if(ret == -1){
1722
perror_plus("asprintf");
1723
exit(1);
1724
}
1725
ret = setenv("DELAY", delaystring, 1);
1726
if(ret == -1){
1727
free(delaystring);
1728
perror_plus("setenv");
1729
exit(1);
1730
}
1731
free(delaystring);
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1734
} else {
1735
int status;
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1738
free(fullname);
1739
continue;
1740
}
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1747
free(fullname);
1748
continue;
1749
}
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1754
WTERMSIG(status));
1755
free(fullname);
1756
continue;
1757
} else {
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
1760
direntry->d_name);
1761
free(fullname);
1762
continue;
1763
}
1764
}
1765
free(fullname);
1766
if(quit_now){
1767
goto end;
1768
}
1769
}
1770
close(devnull);
1014
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1015
if(ret == ARGP_ERR_UNKNOWN){
1016
fprintf(stderr, "Unknown error while parsing arguments\n");
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1771
1019
}
1772
1020
}
1773
1021
1775
1023
avahi_set_log_function(empty_log);
1776
1024
}
1777
1025
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(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
1812
1026
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
1027
from the signal handler */
1814
1028
/* Initialize the pseudo-RNG for Avahi */
1815
1029
srand((unsigned int) time(NULL));
1816
1030
mc.simple_poll = avahi_simple_poll_new();
1817
1031
if(mc.simple_poll == NULL){
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
1820
exitcode = EX_UNAVAILABLE;
1032
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1033
exitcode = EXIT_FAILURE;
1821
1034
goto end;
1822
1035
}
1823
1036
1824
1037
sigemptyset(&sigterm_action.sa_mask);
1825
1038
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1826
1039
if(ret == -1){
1827
perror_plus("sigaddset");
1828
exitcode = EX_OSERR;
1040
perror("sigaddset");
1041
exitcode = EXIT_FAILURE;
1829
1042
goto end;
1830
1043
}
1831
1044
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1832
1045
if(ret == -1){
1833
perror_plus("sigaddset");
1834
exitcode = EX_OSERR;
1046
perror("sigaddset");
1047
exitcode = EXIT_FAILURE;
1835
1048
goto end;
1836
1049
}
1837
1050
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1838
1051
if(ret == -1){
1839
perror_plus("sigaddset");
1840
exitcode = EX_OSERR;
1841
goto end;
1842
}
1843
/* Need to check if the handler is SIG_IGN before handling:
1844
| [[info:libc:Initial Signal Actions]] |
1845
| [[info:libc:Basic Signal Handling]] |
1846
*/
1847
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
return EX_OSERR;
1851
}
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGINT, &sigterm_action, NULL);
1854
if(ret == -1){
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1857
goto end;
1858
}
1859
}
1860
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
return EX_OSERR;
1864
}
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1867
if(ret == -1){
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
}
1872
}
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1874
if(ret == -1){
1875
perror_plus("sigaction");
1876
return EX_OSERR;
1877
}
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1880
if(ret == -1){
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1883
goto end;
1884
}
1885
}
1052
perror("sigaddset");
1053
exitcode = EXIT_FAILURE;
1054
goto end;
1055
}
1056
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1057
if(ret == -1){
1058
perror("sigaction");
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1886
1062
1887
1063
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1064
if(interface[0] != '\0'){
1889
1065
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
1066
if(if_index == 0){
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1893
exitcode = EX_UNAVAILABLE;
1067
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1068
exitcode = EXIT_FAILURE;
1894
1069
goto end;
1895
1070
}
1896
1071
1898
1073
goto end;
1899
1074
}
1900
1075
1901
/* Re-raise priviliges */
1902
errno = 0;
1903
ret = seteuid(0);
1904
if(ret == -1){
1905
perror_plus("seteuid");
1906
}
1907
1908
1076
#ifdef __linux__
1909
1077
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1910
messages about the network interface to mess up the prompt */
1078
messages to mess up the prompt */
1911
1079
ret = klogctl(8, NULL, 5);
1912
1080
bool restore_loglevel = true;
1913
1081
if(ret == -1){
1914
1082
restore_loglevel = false;
1915
perror_plus("klogctl");
1083
perror("klogctl");
1916
1084
}
1917
1085
#endif /* __linux__ */
1918
1086
1919
1087
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1920
1088
if(sd < 0){
1921
perror_plus("socket");
1922
exitcode = EX_OSERR;
1089
perror("socket");
1090
exitcode = EXIT_FAILURE;
1923
1091
#ifdef __linux__
1924
1092
if(restore_loglevel){
1925
1093
ret = klogctl(7, NULL, 0);
1926
1094
if(ret == -1){
1927
perror_plus("klogctl");
1095
perror("klogctl");
1928
1096
}
1929
1097
}
1930
1098
#endif /* __linux__ */
1931
/* Lower privileges */
1932
errno = 0;
1933
ret = seteuid(uid);
1934
if(ret == -1){
1935
perror_plus("seteuid");
1936
}
1937
1099
goto end;
1938
1100
}
1939
1101
strcpy(network.ifr_name, interface);
1940
1102
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1941
1103
if(ret == -1){
1942
perror_plus("ioctl SIOCGIFFLAGS");
1104
perror("ioctl SIOCGIFFLAGS");
1943
1105
#ifdef __linux__
1944
1106
if(restore_loglevel){
1945
1107
ret = klogctl(7, NULL, 0);
1946
1108
if(ret == -1){
1947
perror_plus("klogctl");
1109
perror("klogctl");
1948
1110
}
1949
1111
}
1950
1112
#endif /* __linux__ */
1951
exitcode = EX_OSERR;
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1113
exitcode = EXIT_FAILURE;
1958
1114
goto end;
1959
1115
}
1960
1116
if((network.ifr_flags & IFF_UP) == 0){
1963
1119
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1964
1120
if(ret == -1){
1965
1121
take_down_interface = false;
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1967
exitcode = EX_OSERR;
1122
perror("ioctl SIOCSIFFLAGS");
1123
exitcode = EXIT_FAILURE;
1968
1124
#ifdef __linux__
1969
1125
if(restore_loglevel){
1970
1126
ret = klogctl(7, NULL, 0);
1971
1127
if(ret == -1){
1972
perror_plus("klogctl");
1128
perror("klogctl");
1973
1129
}
1974
1130
}
1975
1131
#endif /* __linux__ */
1976
/* Lower privileges */
1977
errno = 0;
1978
ret = seteuid(uid);
1979
if(ret == -1){
1980
perror_plus("seteuid");
1981
}
1982
1132
goto end;
1983
1133
}
1984
1134
}
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
1135
/* sleep checking until interface is running */
1987
1136
for(int i=0; i < delay * 4; i++){
1988
1137
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1989
1138
if(ret == -1){
1990
perror_plus("ioctl SIOCGIFFLAGS");
1139
perror("ioctl SIOCGIFFLAGS");
1991
1140
} else if(network.ifr_flags & IFF_RUNNING){
1992
1141
break;
1993
1142
}
1994
1143
struct timespec sleeptime = { .tv_nsec = 250000000 };
1995
1144
ret = nanosleep(&sleeptime, NULL);
1996
1145
if(ret == -1 and errno != EINTR){
1997
perror_plus("nanosleep");
1146
perror("nanosleep");
1998
1147
}
1999
1148
}
2000
1149
if(not take_down_interface){
2001
1150
/* We won't need the socket anymore */
2002
1151
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2003
1152
if(ret == -1){
2004
perror_plus("close");
1153
perror("close");
2005
1154
}
2006
1155
}
2007
1156
#ifdef __linux__
2009
1158
/* Restores kernel loglevel to default */
2010
1159
ret = klogctl(7, NULL, 0);
2011
1160
if(ret == -1){
2012
perror_plus("klogctl");
1161
perror("klogctl");
2013
1162
}
2014
1163
}
2015
1164
#endif /* __linux__ */
2016
/* Lower privileges */
2017
errno = 0;
2018
if(take_down_interface){
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2024
} else {
2025
/* Lower privileges permanently */
2026
ret = setuid(uid);
2027
if(ret == -1){
2028
perror_plus("setuid");
2029
}
2030
}
1165
}
1166
1167
if(quit_now){
1168
goto end;
1169
}
1170
1171
uid = getuid();
1172
gid = getgid();
1173
1174
errno = 0;
1175
setgid(gid);
1176
if(ret == -1){
1177
perror("setgid");
1178
}
1179
1180
ret = setuid(uid);
1181
if(ret == -1){
1182
perror("setuid");
2031
1183
}
2032
1184
2033
1185
if(quit_now){
2036
1188
2037
1189
ret = init_gnutls_global(pubkey, seckey);
2038
1190
if(ret == -1){
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
2041
exitcode = EX_UNAVAILABLE;
1191
fprintf(stderr, "init_gnutls_global failed\n");
1192
exitcode = EXIT_FAILURE;
2042
1193
goto end;
2043
1194
} else {
2044
1195
gnutls_initialized = true;
2048
1199
goto end;
2049
1200
}
2050
1201
1202
tempdir_created = true;
2051
1203
if(mkdtemp(tempdir) == NULL){
2052
perror_plus("mkdtemp");
1204
tempdir_created = false;
1205
perror("mkdtemp");
2053
1206
goto end;
2054
1207
}
2055
tempdir_created = true;
2056
1208
2057
1209
if(quit_now){
2058
1210
goto end;
2059
1211
}
2060
1212
2061
1213
if(not init_gpgme(pubkey, seckey, tempdir)){
2062
fprintf(stderr, "Mandos plugin mandos-client: "
2063
"init_gpgme failed\n");
2064
exitcode = EX_UNAVAILABLE;
1214
fprintf(stderr, "init_gpgme failed\n");
1215
exitcode = EXIT_FAILURE;
2065
1216
goto end;
2066
1217
} else {
2067
1218
gpgme_initialized = true;
2076
1227
/* (Mainly meant for debugging) */
2077
1228
char *address = strrchr(connect_to, ':');
2078
1229
if(address == NULL){
2079
fprintf(stderr, "Mandos plugin mandos-client: "
2080
"No colon in address\n");
2081
exitcode = EX_USAGE;
1230
fprintf(stderr, "No colon in address\n");
1231
exitcode = EXIT_FAILURE;
2082
1232
goto end;
2083
1233
}
2084
1234
2091
1241
tmpmax = strtoimax(address+1, &tmp, 10);
2092
1242
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2093
1243
or tmpmax != (uint16_t)tmpmax){
2094
fprintf(stderr, "Mandos plugin mandos-client: "
2095
"Bad port number\n");
2096
exitcode = EX_USAGE;
1244
fprintf(stderr, "Bad port number\n");
1245
exitcode = EXIT_FAILURE;
2097
1246
goto end;
2098
1247
}
2099
1248
2103
1252
2104
1253
port = (uint16_t)tmpmax;
2105
1254
*address = '\0';
1255
address = connect_to;
2106
1256
/* Colon in address indicates IPv6 */
2107
1257
int af;
2108
if(strchr(connect_to, ':') != NULL){
1258
if(strchr(address, ':') != NULL){
2109
1259
af = AF_INET6;
2110
/* Accept [] around IPv6 address - see RFC 5952 */
2111
if(connect_to[0] == '[' and address[-1] == ']')
2112
{
2113
connect_to++;
2114
address[-1] = '\0';
2115
}
2116
1260
} else {
2117
1261
af = AF_INET;
2118
1262
}
2119
address = connect_to;
2120
1263
2121
1264
if(quit_now){
2122
1265
goto end;
2123
1266
}
2124
1267
2125
while(not quit_now){
2126
ret = start_mandos_communication(address, port, if_index, af);
2127
if(quit_now or ret == 0){
2128
break;
2129
}
2130
if(debug){
2131
fprintf(stderr, "Mandos plugin mandos-client: "
2132
"Retrying in %d seconds\n", (int)retry_interval);
2133
}
2134
sleep((int)retry_interval);
2135
}
2136
2137
if (not quit_now){
1268
ret = start_mandos_communication(address, port, if_index, af);
1269
if(ret < 0){
1270
exitcode = EXIT_FAILURE;
1271
} else {
2138
1272
exitcode = EXIT_SUCCESS;
2139
1273
}
2140
2141
1274
goto end;
2142
1275
}
2143
1276
2165
1298
2166
1299
/* Check if creating the Avahi server object succeeded */
2167
1300
if(mc.server == NULL){
2168
fprintf(stderr, "Mandos plugin mandos-client: "
2169
"Failed to create Avahi server: %s\n",
1301
fprintf(stderr, "Failed to create Avahi server: %s\n",
2170
1302
avahi_strerror(error));
2171
exitcode = EX_UNAVAILABLE;
1303
exitcode = EXIT_FAILURE;
2172
1304
goto end;
2173
1305
}
2174
1306
2181
1313
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
1314
NULL, 0, browse_callback, NULL);
2183
1315
if(sb == NULL){
2184
fprintf(stderr, "Mandos plugin mandos-client: "
2185
"Failed to create service browser: %s\n",
1316
fprintf(stderr, "Failed to create service browser: %s\n",
2186
1317
avahi_strerror(avahi_server_errno(mc.server)));
2187
exitcode = EX_UNAVAILABLE;
1318
exitcode = EXIT_FAILURE;
2188
1319
goto end;
2189
1320
}
2190
1321
2195
1326
/* Run the main loop */
2196
1327
2197
1328
if(debug){
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2200
}
2201
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2204
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
2208
}
1329
fprintf(stderr, "Starting Avahi loop search\n");
1330
}
1331
1332
avahi_simple_poll_loop(mc.simple_poll);
2209
1333
2210
1334
end:
2211
1335
2212
1336
if(debug){
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
1337
fprintf(stderr, "%s exiting\n", argv[0]);
2215
1338
}
2216
1339
2217
1340
/* Cleanup things */
2233
1356
if(gpgme_initialized){
2234
1357
gpgme_release(mc.ctx);
2235
1358
}
2236
2237
/* Cleans up the circular linked list of Mandos servers the client
2238
has seen */
2239
if(mc.current_server != NULL){
2240
mc.current_server->prev->next = NULL;
2241
while(mc.current_server != NULL){
2242
server *next = mc.current_server->next;
2243
free(mc.current_server);
2244
mc.current_server = next;
2245
}
2246
}
2247
2248
/* XXX run network hooks "stop" here */
2249
1359
2250
1360
/* Take down the network interface */
2251
1361
if(take_down_interface){
2252
/* Re-raise priviliges */
2253
errno = 0;
2254
ret = seteuid(0);
1362
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
1363
if(ret == -1){
2256
perror_plus("seteuid");
1364
perror("ioctl SIOCGIFFLAGS");
1365
} else if(network.ifr_flags & IFF_UP) {
1366
network.ifr_flags &= ~IFF_UP; /* clear flag */
1367
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1368
if(ret == -1){
1369
perror("ioctl SIOCSIFFLAGS");
1370
}
2257
1371
}
2258
if(geteuid() == 0){
2259
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
2263
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2264
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2265
if(ret == -1){
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2267
}
2268
}
2269
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
1372
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1373
if(ret == -1){
1374
perror("close");
2279
1375
}
2280
1376
}
2281
1377
2282
/* Removes the GPGME temp directory and all files inside */
1378
/* Removes the temp directory used by GPGME */
2283
1379
if(tempdir_created){
2284
struct dirent **direntries = NULL;
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2287
alphasort);
2288
if (numentries > 0){
2289
for(int i = 0; i < numentries; i++){
2290
direntry = direntries[i];
1380
DIR *d;
1381
struct dirent *direntry;
1382
d = opendir(tempdir);
1383
if(d == NULL){
1384
if(errno != ENOENT){
1385
perror("opendir");
1386
}
1387
} else {
1388
while(true){
1389
direntry = readdir(d);
1390
if(direntry == NULL){
1391
break;
1392
}
1393
/* Skip "." and ".." */
1394
if(direntry->d_name[0] == '.'
1395
and (direntry->d_name[1] == '\0'
1396
or (direntry->d_name[1] == '.'
1397
and direntry->d_name[2] == '\0'))){
1398
continue;
1399
}
2291
1400
char *fullname = NULL;
2292
1401
ret = asprintf(&fullname, "%s/%s", tempdir,
2293
1402
direntry->d_name);
2294
1403
if(ret < 0){
2295
perror_plus("asprintf");
1404
perror("asprintf");
2296
1405
continue;
2297
1406
}
2298
1407
ret = remove(fullname);
2299
1408
if(ret == -1){
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1409
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1410
strerror(errno));
2302
1411
}
2303
1412
free(fullname);
2304
1413
}
2305
}
2306
2307
/* need to clean even if 0 because man page doesn't specify */
2308
free(direntries);
2309
if (numentries == -1){
2310
perror_plus("scandir");
1414
closedir(d);
2311
1415
}
2312
1416
ret = rmdir(tempdir);
2313
1417
if(ret == -1 and errno != ENOENT){
2314
perror_plus("rmdir");
2315
}
2316
}
2317
2318
if(quit_now){
2319
sigemptyset(&old_sigterm_action.sa_mask);
2320
old_sigterm_action.sa_handler = SIG_DFL;
2321
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2322
&old_sigterm_action,
2323
NULL));
2324
if(ret == -1){
2325
perror_plus("sigaction");
2326
}
2327
do {
2328
ret = raise(signal_received);
2329
} while(ret != 0 and errno == EINTR);
2330
if(ret != 0){
2331
perror_plus("raise");
2332
abort();
2333
}
2334
TEMP_FAILURE_RETRY(pause());
1418
perror("rmdir");
1419
}
2335
1420
}
2336
1421
2337
1422
return exitcode;
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Version: 2.0.2.dev0