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- Committer: teddy at bsnet
- Date: 2011-11-13 13:55:45 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-20111113135545-hyb59g1q2icwdcte
* plugins.d/mandos-client.c: Some white space fixes.
(runnable_hook): Simplify name rule. More debug messages.
(runnable_hook): Simplify name rule. More debug messages.
- 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() */
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, EXIT_FAILURE,
47
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
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() */
56
#include <sys/stat.h> /* open(), S_ISREG */
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
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
71
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
82
83
#include <signal.h> /* sigemptyset(), sigaddset(),
83
84
sigaction(), SIGTERM, sig_atomic_t,
84
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() */
85
90
86
91
#ifdef __linux__
87
92
#include <sys/klog.h> /* klogctl() */
105
110
init_gnutls_session(),
106
111
GNUTLS_* */
107
112
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
110
115
111
116
/* GPGME */
112
117
#include <gpgme.h> /* All GPGME types, constants and
120
125
#define PATHDIR "/conf/conf.d/mandos"
121
126
#define SECKEY "seckey.txt"
122
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
129
124
130
bool debug = false;
125
131
static const char mandos_protocol_version[] = "1";
126
132
const char *argp_program_version = "mandos-client " VERSION;
127
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;
128
148
129
149
/* Used for passing in values through the Avahi callback functions */
130
150
typedef struct {
135
155
gnutls_dh_params_t dh_params;
136
156
const char *priority;
137
157
gpgme_ctx_t ctx;
158
server *current_server;
138
159
} mandos_context;
139
160
140
161
/* global context so signal handler can reach it*/
141
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
163
.dh_bits = 1024, .priority = "SECURE256"
143
":!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
}
144
176
145
177
/*
146
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
148
180
* "buffer_length" is how much is already used.
149
181
*/
150
182
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
183
size_t buffer_capacity){
152
184
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
186
if(buffer == NULL){
159
191
return buffer_capacity;
160
192
}
161
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
162
231
/*
163
232
* Initialize GPGME.
164
233
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
167
236
gpgme_error_t rc;
168
237
gpgme_engine_info_t engine_info;
169
238
178
247
179
248
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
249
if(fd == -1){
181
perror("open");
250
perror_plus("open");
182
251
return false;
183
252
}
184
253
185
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
255
if(rc != GPG_ERR_NO_ERROR){
187
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",
188
258
gpgme_strsource(rc), gpgme_strerror(rc));
189
259
return false;
190
260
}
191
261
192
262
rc = gpgme_op_import(mc.ctx, pgp_data);
193
263
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
195
266
gpgme_strsource(rc), gpgme_strerror(rc));
196
267
return false;
197
268
}
198
269
199
270
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
271
if(ret == -1){
201
perror("close");
272
perror_plus("close");
202
273
}
203
274
gpgme_data_release(pgp_data);
204
275
return true;
205
276
}
206
277
207
278
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
209
281
}
210
282
211
283
/* Init GPGME */
212
284
gpgme_check_version(NULL);
213
285
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
286
if(rc != GPG_ERR_NO_ERROR){
215
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",
216
289
gpgme_strsource(rc), gpgme_strerror(rc));
217
290
return false;
218
291
}
219
292
220
/* Set GPGME home directory for the OpenPGP engine only */
293
/* Set GPGME home directory for the OpenPGP engine only */
221
294
rc = gpgme_get_engine_info(&engine_info);
222
295
if(rc != GPG_ERR_NO_ERROR){
223
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",
224
298
gpgme_strsource(rc), gpgme_strerror(rc));
225
299
return false;
226
300
}
233
307
engine_info = engine_info->next;
234
308
}
235
309
if(engine_info == NULL){
236
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);
237
312
return false;
238
313
}
239
314
240
315
/* Create new GPGME "context" */
241
316
rc = gpgme_new(&(mc.ctx));
242
317
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
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));
245
321
return false;
246
322
}
247
323
266
342
ssize_t plaintext_length = 0;
267
343
268
344
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
270
347
}
271
348
272
349
/* Create new GPGME data buffer from memory cryptotext */
273
350
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
351
0);
275
352
if(rc != GPG_ERR_NO_ERROR){
276
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",
277
355
gpgme_strsource(rc), gpgme_strerror(rc));
278
356
return -1;
279
357
}
281
359
/* Create new empty GPGME data buffer for the plaintext */
282
360
rc = gpgme_data_new(&dh_plain);
283
361
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
285
364
gpgme_strsource(rc), gpgme_strerror(rc));
286
365
gpgme_data_release(dh_crypto);
287
366
return -1;
291
370
data buffer */
292
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
372
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
295
375
gpgme_strsource(rc), gpgme_strerror(rc));
296
376
plaintext_length = -1;
297
377
if(debug){
298
378
gpgme_decrypt_result_t result;
299
379
result = gpgme_op_decrypt_result(mc.ctx);
300
380
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
302
383
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
304
386
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
306
389
result->wrong_key_usage);
307
390
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
309
393
}
310
394
gpgme_recipient_t recipient;
311
395
recipient = result->recipients;
312
396
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
314
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
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",
317
404
recipient->status == GPG_ERR_NO_SECKEY
318
405
? "No" : "Yes");
319
406
recipient = recipient->next;
324
411
}
325
412
326
413
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
328
416
}
329
417
330
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
420
perror_plus("gpgme_data_seek");
333
421
plaintext_length = -1;
334
422
goto decrypt_end;
335
423
}
337
425
*plaintext = NULL;
338
426
while(true){
339
427
plaintext_capacity = incbuffer(plaintext,
340
(size_t)plaintext_length,
341
plaintext_capacity);
428
(size_t)plaintext_length,
429
plaintext_capacity);
342
430
if(plaintext_capacity == 0){
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
346
434
}
347
435
348
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
353
441
break;
354
442
}
355
443
if(ret < 0){
356
perror("gpgme_data_read");
444
perror_plus("gpgme_data_read");
357
445
plaintext_length = -1;
358
446
goto decrypt_end;
359
447
}
361
449
}
362
450
363
451
if(debug){
364
fprintf(stderr, "Decrypted password is: ");
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
365
454
for(ssize_t i = 0; i < plaintext_length; i++){
366
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
367
456
}
389
478
/* GnuTLS log function callback */
390
479
static void debuggnutls(__attribute__((unused)) int level,
391
480
const char* string){
392
fprintf(stderr, "GnuTLS: %s", string);
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
393
482
}
394
483
395
484
static int init_gnutls_global(const char *pubkeyfilename,
397
486
int ret;
398
487
399
488
if(debug){
400
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
401
491
}
402
492
403
493
ret = gnutls_global_init();
404
494
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
407
497
return -1;
408
498
}
409
499
416
506
}
417
507
418
508
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
420
510
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
426
513
gnutls_global_deinit();
427
514
return -1;
428
515
}
429
516
430
517
if(debug){
431
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"
432
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
521
seckeyfilename);
434
522
}
438
526
GNUTLS_OPENPGP_FMT_BASE64);
439
527
if(ret != GNUTLS_E_SUCCESS){
440
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
441
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
445
534
goto globalfail;
446
535
}
447
536
448
537
/* GnuTLS server initialization */
449
538
ret = gnutls_dh_params_init(&mc.dh_params);
450
539
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
452
542
" %s\n", safer_gnutls_strerror(ret));
453
543
goto globalfail;
454
544
}
455
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
546
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
458
549
safer_gnutls_strerror(ret));
459
550
goto globalfail;
460
551
}
474
565
static int init_gnutls_session(gnutls_session_t *session){
475
566
int ret;
476
567
/* GnuTLS session creation */
477
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);
478
574
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
480
577
safer_gnutls_strerror(ret));
481
578
}
482
579
483
580
{
484
581
const char *err;
485
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);
486
589
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
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));
490
594
gnutls_deinit(*session);
491
595
return -1;
492
596
}
493
597
}
494
598
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
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);
497
607
if(ret != GNUTLS_E_SUCCESS){
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
499
610
safer_gnutls_strerror(ret));
500
611
gnutls_deinit(*session);
501
612
return -1;
502
613
}
503
614
504
615
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
617
508
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
509
619
514
624
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
625
__attribute__((unused)) const char *txt){}
516
626
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
520
627
/* Called when a Mandos server is found */
521
628
static int start_mandos_communication(const char *ip, uint16_t port,
522
629
AvahiIfIndex if_index,
528
635
struct sockaddr_in6 in6;
529
636
} to;
530
637
char *buffer = NULL;
531
char *decrypted_buffer;
638
char *decrypted_buffer = NULL;
532
639
size_t buffer_length = 0;
533
640
size_t buffer_capacity = 0;
534
641
size_t written;
535
int retval = 0;
642
int retval = -1;
536
643
gnutls_session_t session;
537
644
int pf; /* Protocol family */
538
645
646
errno = 0;
647
539
648
if(quit_now){
649
errno = EINTR;
540
650
return -1;
541
651
}
542
652
548
658
pf = PF_INET;
549
659
break;
550
660
default:
551
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;
552
664
return -1;
553
665
}
554
666
558
670
}
559
671
560
672
if(debug){
561
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
562
675
"\n", ip, port);
563
676
}
564
677
565
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
566
679
if(tcp_sd < 0){
567
perror("socket");
568
retval = -1;
680
int e = errno;
681
perror_plus("socket");
682
errno = e;
569
683
goto mandos_end;
570
684
}
571
685
572
686
if(quit_now){
687
errno = EINTR;
573
688
goto mandos_end;
574
689
}
575
690
582
697
ret = inet_pton(af, ip, &to.in.sin_addr);
583
698
}
584
699
if(ret < 0 ){
585
perror("inet_pton");
586
retval = -1;
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
587
703
goto mandos_end;
588
704
}
589
705
if(ret == 0){
590
fprintf(stderr, "Bad address: %s\n", ip);
591
retval = -1;
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
592
710
goto mandos_end;
593
711
}
594
712
if(af == AF_INET6){
598
716
599
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
600
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
601
-Wunreachable-code*/
719
-Wunreachable-code*/
602
720
if(if_index == AVAHI_IF_UNSPEC){
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
604
723
" without a network interface\n");
605
retval = -1;
724
errno = EINVAL;
606
725
goto mandos_end;
607
726
}
608
727
/* Set the network interface number as scope */
615
734
}
616
735
617
736
if(quit_now){
737
errno = EINTR;
618
738
goto mandos_end;
619
739
}
620
740
622
742
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
623
743
char interface[IF_NAMESIZE];
624
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
625
perror("if_indextoname");
745
perror_plus("if_indextoname");
626
746
} else {
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
628
749
ip, interface, port);
629
750
}
630
751
} else {
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
633
754
}
634
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
635
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
642
763
sizeof(addrstr));
643
764
}
644
765
if(pcret == NULL){
645
perror("inet_ntop");
766
perror_plus("inet_ntop");
646
767
} else {
647
768
if(strcmp(addrstr, ip) != 0){
648
fprintf(stderr, "Canonical address form: %s\n", addrstr);
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
649
771
}
650
772
}
651
773
}
652
774
653
775
if(quit_now){
776
errno = EINTR;
654
777
goto mandos_end;
655
778
}
656
779
660
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
661
784
}
662
785
if(ret < 0){
663
perror("connect");
664
retval = -1;
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
665
791
goto mandos_end;
666
792
}
667
793
668
794
if(quit_now){
795
errno = EINTR;
669
796
goto mandos_end;
670
797
}
671
798
674
801
while(true){
675
802
size_t out_size = strlen(out);
676
803
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
677
out_size - written));
804
out_size - written));
678
805
if(ret == -1){
679
perror("write");
680
retval = -1;
806
int e = errno;
807
perror_plus("write");
808
errno = e;
681
809
goto mandos_end;
682
810
}
683
811
written += (size_t)ret;
693
821
}
694
822
695
823
if(quit_now){
824
errno = EINTR;
696
825
goto mandos_end;
697
826
}
698
827
}
699
828
700
829
if(debug){
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
702
832
}
703
833
704
834
if(quit_now){
835
errno = EINTR;
705
836
goto mandos_end;
706
837
}
707
838
839
/* Spurious warning from -Wint-to-pointer-cast */
708
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
709
841
710
842
if(quit_now){
843
errno = EINTR;
711
844
goto mandos_end;
712
845
}
713
846
714
do{
847
do {
715
848
ret = gnutls_handshake(session);
716
849
if(quit_now){
850
errno = EINTR;
717
851
goto mandos_end;
718
852
}
719
853
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
854
721
855
if(ret != GNUTLS_E_SUCCESS){
722
856
if(debug){
723
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
724
859
gnutls_perror(ret);
725
860
}
726
retval = -1;
861
errno = EPROTO;
727
862
goto mandos_end;
728
863
}
729
864
730
865
/* Read OpenPGP packet that contains the wanted password */
731
866
732
867
if(debug){
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
734
ip);
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
735
870
}
736
871
737
872
while(true){
738
873
739
874
if(quit_now){
875
errno = EINTR;
740
876
goto mandos_end;
741
877
}
742
878
743
879
buffer_capacity = incbuffer(&buffer, buffer_length,
744
buffer_capacity);
880
buffer_capacity);
745
881
if(buffer_capacity == 0){
746
perror("incbuffer");
747
retval = -1;
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
748
885
goto mandos_end;
749
886
}
750
887
751
888
if(quit_now){
889
errno = EINTR;
752
890
goto mandos_end;
753
891
}
754
892
763
901
case GNUTLS_E_AGAIN:
764
902
break;
765
903
case GNUTLS_E_REHANDSHAKE:
766
do{
904
do {
767
905
ret = gnutls_handshake(session);
768
906
769
907
if(quit_now){
908
errno = EINTR;
770
909
goto mandos_end;
771
910
}
772
911
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
773
912
if(ret < 0){
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
775
915
gnutls_perror(ret);
776
retval = -1;
916
errno = EPROTO;
777
917
goto mandos_end;
778
918
}
779
919
break;
780
920
default:
781
fprintf(stderr, "Unknown error while reading data from"
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
782
923
" encrypted session with Mandos server\n");
783
retval = -1;
784
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
785
926
goto mandos_end;
786
927
}
787
928
} else {
790
931
}
791
932
792
933
if(debug){
793
fprintf(stderr, "Closing TLS session\n");
794
}
795
796
if(quit_now){
797
goto mandos_end;
798
}
799
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
802
if(quit_now){
803
goto mandos_end;
804
}
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);
805
950
806
951
if(buffer_length > 0){
807
decrypted_buffer_size = pgp_packet_decrypt(buffer,
808
buffer_length,
952
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
809
954
&decrypted_buffer);
810
955
if(decrypted_buffer_size >= 0){
811
ssize_t decrypted_buffer_size;
812
956
813
957
written = 0;
814
958
while(written < (size_t) decrypted_buffer_size){
815
959
if(quit_now){
960
errno = EINTR;
816
961
goto mandos_end;
817
962
}
818
963
820
965
(size_t)decrypted_buffer_size - written,
821
966
stdout);
822
967
if(ret == 0 and ferror(stdout)){
968
int e = errno;
823
969
if(debug){
824
fprintf(stderr, "Error writing encrypted data: %s\n",
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
825
972
strerror(errno));
826
973
}
827
retval = -1;
828
break;
974
errno = e;
975
goto mandos_end;
829
976
}
830
977
written += (size_t)ret;
831
978
}
832
free(decrypted_buffer);
833
} else {
834
retval = -1;
979
retval = 0;
835
980
}
836
} else {
837
retval = -1;
838
981
}
839
982
840
983
/* Shutdown procedure */
841
984
842
985
mandos_end:
843
free(buffer);
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
847
if(ret == -1){
848
perror("close");
849
}
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
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
}
853
1005
}
854
1006
return retval;
855
1007
}
880
1032
switch(event){
881
1033
default:
882
1034
case AVAHI_RESOLVER_FAILURE:
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
884
1037
" of type '%s' in domain '%s': %s\n", name, type, domain,
885
1038
avahi_strerror(avahi_server_errno(mc.server)));
886
1039
break;
890
1043
char ip[AVAHI_ADDRESS_STR_MAX];
891
1044
avahi_address_snprint(ip, sizeof(ip), address);
892
1045
if(debug){
893
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
894
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
1049
ip, (intmax_t)interface, port);
896
1050
}
898
1052
avahi_proto_to_af(proto));
899
1053
if(ret == 0){
900
1054
avahi_simple_poll_quit(mc.simple_poll);
1055
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
901
1058
}
902
1059
}
903
1060
}
927
1084
default:
928
1085
case AVAHI_BROWSER_FAILURE:
929
1086
930
fprintf(stderr, "(Avahi browser) %s\n",
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
931
1089
avahi_strerror(avahi_server_errno(mc.server)));
932
1090
avahi_simple_poll_quit(mc.simple_poll);
933
1091
return;
941
1099
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
942
1100
name, type, domain, protocol, 0,
943
1101
resolve_callback, NULL) == NULL)
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
945
1104
name, avahi_strerror(avahi_server_errno(mc.server)));
946
1105
break;
947
1106
951
1110
case AVAHI_BROWSER_ALL_FOR_NOW:
952
1111
case AVAHI_BROWSER_CACHE_EXHAUSTED:
953
1112
if(debug){
954
fprintf(stderr, "No Mandos server found, still searching...\n");
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
955
1115
}
956
1116
break;
957
1117
}
958
1118
}
959
1119
960
/* stop main loop after sigterm has been called */
1120
/* Signal handler that stops main loop after SIGTERM */
961
1121
static void handle_sigterm(int sig){
962
1122
if(quit_now){
963
1123
return;
965
1125
quit_now = 1;
966
1126
signal_received = sig;
967
1127
int old_errno = errno;
1128
/* set main loop to exit */
968
1129
if(mc.simple_poll != NULL){
969
1130
avahi_simple_poll_quit(mc.simple_poll);
970
1131
}
971
1132
errno = old_errno;
972
1133
}
973
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
974
1413
int main(int argc, char *argv[]){
975
1414
AvahiSServiceBrowser *sb = NULL;
976
1415
int error;
978
1417
intmax_t tmpmax;
979
1418
char *tmp;
980
1419
int exitcode = EXIT_SUCCESS;
981
const char *interface = "eth0";
1420
const char *interface = "";
982
1421
struct ifreq network;
983
1422
int sd = -1;
984
1423
bool take_down_interface = false;
985
1424
uid_t uid;
986
1425
gid_t gid;
987
char *connect_to = NULL;
988
1426
char tempdir[] = "/tmp/mandosXXXXXX";
989
1427
bool tempdir_created = false;
990
1428
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
994
1432
bool gnutls_initialized = false;
995
1433
bool gpgme_initialized = false;
996
1434
float delay = 2.5f;
1435
double retry_interval = 10; /* 10s between trying a server and
1436
retrying the same server again */
997
1437
998
struct sigaction old_sigterm_action;
1438
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
999
1439
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1000
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
1001
1462
{
1002
1463
struct argp_option options[] = {
1003
1464
{ .name = "debug", .key = 128,
1032
1493
.arg = "SECONDS",
1033
1494
.doc = "Maximum delay to wait for interface startup",
1034
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 },
1035
1513
{ .name = NULL }
1036
1514
};
1037
1515
1038
1516
error_t parse_opt(int key, char *arg,
1039
1517
struct argp_state *state){
1518
errno = 0;
1040
1519
switch(key){
1041
1520
case 128: /* --debug */
1042
1521
debug = true;
1058
1537
tmpmax = strtoimax(arg, &tmp, 10);
1059
1538
if(errno != 0 or tmp == arg or *tmp != '\0'
1060
1539
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
1540
argp_error(state, "Bad number of DH bits");
1063
1541
}
1064
1542
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1065
1543
break;
1070
1548
errno = 0;
1071
1549
delay = strtof(arg, &tmp);
1072
1550
if(errno != 0 or tmp == arg or *tmp != '\0'){
1073
fprintf(stderr, "Bad delay\n");
1074
exit(EXIT_FAILURE);
1075
}
1076
break;
1077
case ARGP_KEY_ARG:
1078
argp_usage(state);
1079
case ARGP_KEY_END:
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);
1080
1579
break;
1081
1580
default:
1082
1581
return ARGP_ERR_UNKNOWN;
1083
1582
}
1084
return 0;
1583
return errno;
1085
1584
}
1086
1585
1087
1586
struct argp argp = { .options = options, .parser = parse_opt,
1088
1587
.args_doc = "",
1089
1588
.doc = "Mandos client -- Get and decrypt"
1090
1589
" passwords from a Mandos server" };
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
1095
goto end;
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("DEVICE", interface, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("MODE", "start", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
char *delaystring;
1707
ret = asprintf(&delaystring, "%f", delay);
1708
if(ret == -1){
1709
perror_plus("asprintf");
1710
exit(1);
1711
}
1712
ret = setenv("DELAY", delaystring, 1);
1713
if(ret == -1){
1714
free(delaystring);
1715
perror_plus("setenv");
1716
exit(1);
1717
}
1718
free(delaystring);
1719
ret = execl(fullname, direntry->d_name, "start", NULL);
1720
perror_plus("execl");
1721
} else {
1722
int status;
1723
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1724
perror_plus("waitpid");
1725
free(fullname);
1726
continue;
1727
}
1728
if(WIFEXITED(status)){
1729
if(WEXITSTATUS(status) != 0){
1730
fprintf(stderr, "Mandos plugin mandos-client: "
1731
"Warning: network hook \"%s\" exited"
1732
" with status %d\n", direntry->d_name,
1733
WEXITSTATUS(status));
1734
free(fullname);
1735
continue;
1736
}
1737
} else if(WIFSIGNALED(status)){
1738
fprintf(stderr, "Mandos plugin mandos-client: "
1739
"Warning: network hook \"%s\" died by"
1740
" signal %d\n", direntry->d_name,
1741
WTERMSIG(status));
1742
free(fullname);
1743
continue;
1744
} else {
1745
fprintf(stderr, "Mandos plugin mandos-client: "
1746
"Warning: network hook \"%s\" crashed\n",
1747
direntry->d_name);
1748
free(fullname);
1749
continue;
1750
}
1751
}
1752
free(fullname);
1753
if(quit_now){
1754
goto end;
1755
}
1756
}
1757
close(devnull);
1096
1758
}
1097
1759
}
1098
1760
1100
1762
avahi_set_log_function(empty_log);
1101
1763
}
1102
1764
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf(stderr, "Mandos plugin mandos-client: "
1781
"Using interface \"%s\"\n", interface);
1782
}
1783
if(interface == NULL){
1784
perror_plus("malloc");
1785
free(direntries);
1786
exitcode = EXIT_FAILURE;
1787
goto end;
1788
}
1789
free(direntries);
1790
} else {
1791
free(direntries);
1792
fprintf(stderr, "Mandos plugin mandos-client: "
1793
"Could not find a network interface\n");
1794
exitcode = EXIT_FAILURE;
1795
goto end;
1796
}
1797
}
1798
1103
1799
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1104
1800
from the signal handler */
1105
1801
/* Initialize the pseudo-RNG for Avahi */
1106
1802
srand((unsigned int) time(NULL));
1107
1803
mc.simple_poll = avahi_simple_poll_new();
1108
1804
if(mc.simple_poll == NULL){
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Avahi: Failed to create simple poll object.\n");
1807
exitcode = EX_UNAVAILABLE;
1111
1808
goto end;
1112
1809
}
1113
1810
1114
1811
sigemptyset(&sigterm_action.sa_mask);
1115
1812
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1116
1813
if(ret == -1){
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
1814
perror_plus("sigaddset");
1815
exitcode = EX_OSERR;
1119
1816
goto end;
1120
1817
}
1121
1818
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1122
1819
if(ret == -1){
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
1820
perror_plus("sigaddset");
1821
exitcode = EX_OSERR;
1125
1822
goto end;
1126
1823
}
1127
1824
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1128
1825
if(ret == -1){
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
1826
perror_plus("sigaddset");
1827
exitcode = EX_OSERR;
1131
1828
goto end;
1132
1829
}
1133
1830
/* Need to check if the handler is SIG_IGN before handling:
1136
1833
*/
1137
1834
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1138
1835
if(ret == -1){
1139
perror("sigaction");
1140
return EXIT_FAILURE;
1836
perror_plus("sigaction");
1837
return EX_OSERR;
1141
1838
}
1142
1839
if(old_sigterm_action.sa_handler != SIG_IGN){
1143
1840
ret = sigaction(SIGINT, &sigterm_action, NULL);
1144
1841
if(ret == -1){
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
1842
perror_plus("sigaction");
1843
exitcode = EX_OSERR;
1147
1844
goto end;
1148
1845
}
1149
1846
}
1150
1847
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1151
1848
if(ret == -1){
1152
perror("sigaction");
1153
return EXIT_FAILURE;
1849
perror_plus("sigaction");
1850
return EX_OSERR;
1154
1851
}
1155
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1156
1853
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1157
1854
if(ret == -1){
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1160
1857
goto end;
1161
1858
}
1162
1859
}
1163
1860
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1164
1861
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1862
perror_plus("sigaction");
1863
return EX_OSERR;
1167
1864
}
1168
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
1866
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1170
1867
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1173
1870
goto end;
1174
1871
}
1175
1872
}
1176
1873
1177
1874
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
1875
if(strcmp(interface, "none") != 0){
1179
1876
if_index = (AvahiIfIndex) if_nametoindex(interface);
1180
1877
if(if_index == 0){
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1878
fprintf(stderr, "Mandos plugin mandos-client: "
1879
"No such interface: \"%s\"\n", interface);
1880
exitcode = EX_UNAVAILABLE;
1183
1881
goto end;
1184
1882
}
1185
1883
1187
1885
goto end;
1188
1886
}
1189
1887
1888
/* Re-raise priviliges */
1889
errno = 0;
1890
ret = seteuid(0);
1891
if(ret == -1){
1892
perror_plus("seteuid");
1893
}
1894
1190
1895
#ifdef __linux__
1191
1896
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1897
messages about the network interface to mess up the prompt */
1193
1898
ret = klogctl(8, NULL, 5);
1194
1899
bool restore_loglevel = true;
1195
1900
if(ret == -1){
1196
1901
restore_loglevel = false;
1197
perror("klogctl");
1902
perror_plus("klogctl");
1198
1903
}
1199
1904
#endif /* __linux__ */
1200
1905
1201
1906
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
1907
if(sd < 0){
1203
perror("socket");
1204
exitcode = EXIT_FAILURE;
1908
perror_plus("socket");
1909
exitcode = EX_OSERR;
1205
1910
#ifdef __linux__
1206
1911
if(restore_loglevel){
1207
1912
ret = klogctl(7, NULL, 0);
1208
1913
if(ret == -1){
1209
perror("klogctl");
1914
perror_plus("klogctl");
1210
1915
}
1211
1916
}
1212
1917
#endif /* __linux__ */
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1213
1924
goto end;
1214
1925
}
1215
1926
strcpy(network.ifr_name, interface);
1216
1927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1217
1928
if(ret == -1){
1218
perror("ioctl SIOCGIFFLAGS");
1929
perror_plus("ioctl SIOCGIFFLAGS");
1219
1930
#ifdef __linux__
1220
1931
if(restore_loglevel){
1221
1932
ret = klogctl(7, NULL, 0);
1222
1933
if(ret == -1){
1223
perror("klogctl");
1934
perror_plus("klogctl");
1224
1935
}
1225
1936
}
1226
1937
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1938
exitcode = EX_OSERR;
1939
/* Lower privileges */
1940
errno = 0;
1941
ret = seteuid(uid);
1942
if(ret == -1){
1943
perror_plus("seteuid");
1944
}
1228
1945
goto end;
1229
1946
}
1230
1947
if((network.ifr_flags & IFF_UP) == 0){
1233
1950
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
1951
if(ret == -1){
1235
1952
take_down_interface = false;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1953
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1954
exitcode = EX_OSERR;
1238
1955
#ifdef __linux__
1239
1956
if(restore_loglevel){
1240
1957
ret = klogctl(7, NULL, 0);
1241
1958
if(ret == -1){
1242
perror("klogctl");
1959
perror_plus("klogctl");
1243
1960
}
1244
1961
}
1245
1962
#endif /* __linux__ */
1963
/* Lower privileges */
1964
errno = 0;
1965
ret = seteuid(uid);
1966
if(ret == -1){
1967
perror_plus("seteuid");
1968
}
1246
1969
goto end;
1247
1970
}
1248
1971
}
1249
/* sleep checking until interface is running */
1972
/* Sleep checking until interface is running.
1973
Check every 0.25s, up to total time of delay */
1250
1974
for(int i=0; i < delay * 4; i++){
1251
1975
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1252
1976
if(ret == -1){
1253
perror("ioctl SIOCGIFFLAGS");
1977
perror_plus("ioctl SIOCGIFFLAGS");
1254
1978
} else if(network.ifr_flags & IFF_RUNNING){
1255
1979
break;
1256
1980
}
1257
1981
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
1982
ret = nanosleep(&sleeptime, NULL);
1259
1983
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1984
perror_plus("nanosleep");
1261
1985
}
1262
1986
}
1263
1987
if(not take_down_interface){
1264
1988
/* We won't need the socket anymore */
1265
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
1990
if(ret == -1){
1267
perror("close");
1991
perror_plus("close");
1268
1992
}
1269
1993
}
1270
1994
#ifdef __linux__
1272
1996
/* Restores kernel loglevel to default */
1273
1997
ret = klogctl(7, NULL, 0);
1274
1998
if(ret == -1){
1275
perror("klogctl");
1999
perror_plus("klogctl");
1276
2000
}
1277
2001
}
1278
2002
#endif /* __linux__ */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1283
}
1284
1285
uid = getuid();
1286
gid = getgid();
1287
1288
errno = 0;
1289
setgid(gid);
1290
if(ret == -1){
1291
perror("setgid");
1292
}
1293
1294
ret = setuid(uid);
1295
if(ret == -1){
1296
perror("setuid");
2003
/* Lower privileges */
2004
errno = 0;
2005
if(take_down_interface){
2006
/* Lower privileges */
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2010
}
2011
} else {
2012
/* Lower privileges permanently */
2013
ret = setuid(uid);
2014
if(ret == -1){
2015
perror_plus("setuid");
2016
}
2017
}
1297
2018
}
1298
2019
1299
2020
if(quit_now){
1302
2023
1303
2024
ret = init_gnutls_global(pubkey, seckey);
1304
2025
if(ret == -1){
1305
fprintf(stderr, "init_gnutls_global failed\n");
1306
exitcode = EXIT_FAILURE;
2026
fprintf(stderr, "Mandos plugin mandos-client: "
2027
"init_gnutls_global failed\n");
2028
exitcode = EX_UNAVAILABLE;
1307
2029
goto end;
1308
2030
} else {
1309
2031
gnutls_initialized = true;
1313
2035
goto end;
1314
2036
}
1315
2037
2038
if(mkdtemp(tempdir) == NULL){
2039
perror_plus("mkdtemp");
2040
goto end;
2041
}
1316
2042
tempdir_created = true;
1317
if(mkdtemp(tempdir) == NULL){
1318
tempdir_created = false;
1319
perror("mkdtemp");
1320
goto end;
1321
}
1322
2043
1323
2044
if(quit_now){
1324
2045
goto end;
1325
2046
}
1326
2047
1327
2048
if(not init_gpgme(pubkey, seckey, tempdir)){
1328
fprintf(stderr, "init_gpgme failed\n");
1329
exitcode = EXIT_FAILURE;
2049
fprintf(stderr, "Mandos plugin mandos-client: "
2050
"init_gpgme failed\n");
2051
exitcode = EX_UNAVAILABLE;
1330
2052
goto end;
1331
2053
} else {
1332
2054
gpgme_initialized = true;
1341
2063
/* (Mainly meant for debugging) */
1342
2064
char *address = strrchr(connect_to, ':');
1343
2065
if(address == NULL){
1344
fprintf(stderr, "No colon in address\n");
1345
exitcode = EXIT_FAILURE;
2066
fprintf(stderr, "Mandos plugin mandos-client: "
2067
"No colon in address\n");
2068
exitcode = EX_USAGE;
1346
2069
goto end;
1347
2070
}
1348
2071
1355
2078
tmpmax = strtoimax(address+1, &tmp, 10);
1356
2079
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1357
2080
or tmpmax != (uint16_t)tmpmax){
1358
fprintf(stderr, "Bad port number\n");
1359
exitcode = EXIT_FAILURE;
2081
fprintf(stderr, "Mandos plugin mandos-client: "
2082
"Bad port number\n");
2083
exitcode = EX_USAGE;
1360
2084
goto end;
1361
2085
}
1362
2086
1366
2090
1367
2091
port = (uint16_t)tmpmax;
1368
2092
*address = '\0';
1369
address = connect_to;
1370
2093
/* Colon in address indicates IPv6 */
1371
2094
int af;
1372
if(strchr(address, ':') != NULL){
2095
if(strchr(connect_to, ':') != NULL){
1373
2096
af = AF_INET6;
2097
/* Accept [] around IPv6 address - see RFC 5952 */
2098
if(connect_to[0] == '[' and address[-1] == ']')
2099
{
2100
connect_to++;
2101
address[-1] = '\0';
2102
}
1374
2103
} else {
1375
2104
af = AF_INET;
1376
2105
}
2106
address = connect_to;
1377
2107
1378
2108
if(quit_now){
1379
2109
goto end;
1380
2110
}
1381
2111
1382
ret = start_mandos_communication(address, port, if_index, af);
1383
if(ret < 0){
1384
exitcode = EXIT_FAILURE;
1385
} else {
2112
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2114
if(quit_now or ret == 0){
2115
break;
2116
}
2117
if(debug){
2118
fprintf(stderr, "Mandos plugin mandos-client: "
2119
"Retrying in %d seconds\n", (int)retry_interval);
2120
}
2121
sleep((int)retry_interval);
2122
}
2123
2124
if (not quit_now){
1386
2125
exitcode = EXIT_SUCCESS;
1387
2126
}
2127
1388
2128
goto end;
1389
2129
}
1390
2130
1412
2152
1413
2153
/* Check if creating the Avahi server object succeeded */
1414
2154
if(mc.server == NULL){
1415
fprintf(stderr, "Failed to create Avahi server: %s\n",
2155
fprintf(stderr, "Mandos plugin mandos-client: "
2156
"Failed to create Avahi server: %s\n",
1416
2157
avahi_strerror(error));
1417
exitcode = EXIT_FAILURE;
2158
exitcode = EX_UNAVAILABLE;
1418
2159
goto end;
1419
2160
}
1420
2161
1427
2168
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1428
2169
NULL, 0, browse_callback, NULL);
1429
2170
if(sb == NULL){
1430
fprintf(stderr, "Failed to create service browser: %s\n",
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"Failed to create service browser: %s\n",
1431
2173
avahi_strerror(avahi_server_errno(mc.server)));
1432
exitcode = EXIT_FAILURE;
2174
exitcode = EX_UNAVAILABLE;
1433
2175
goto end;
1434
2176
}
1435
2177
1440
2182
/* Run the main loop */
1441
2183
1442
2184
if(debug){
1443
fprintf(stderr, "Starting Avahi loop search\n");
1444
}
1445
1446
avahi_simple_poll_loop(mc.simple_poll);
2185
fprintf(stderr, "Mandos plugin mandos-client: "
2186
"Starting Avahi loop search\n");
2187
}
2188
2189
ret = avahi_loop_with_timeout(mc.simple_poll,
2190
(int)(retry_interval * 1000));
2191
if(debug){
2192
fprintf(stderr, "Mandos plugin mandos-client: "
2193
"avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2195
}
1447
2196
1448
2197
end:
1449
2198
1450
2199
if(debug){
1451
fprintf(stderr, "%s exiting\n", argv[0]);
2200
fprintf(stderr, "Mandos plugin mandos-client: "
2201
"%s exiting\n", argv[0]);
1452
2202
}
1453
2203
1454
2204
/* Cleanup things */
1470
2220
if(gpgme_initialized){
1471
2221
gpgme_release(mc.ctx);
1472
2222
}
2223
2224
/* Cleans up the circular linked list of Mandos servers the client
2225
has seen */
2226
if(mc.current_server != NULL){
2227
mc.current_server->prev->next = NULL;
2228
while(mc.current_server != NULL){
2229
server *next = mc.current_server->next;
2230
free(mc.current_server);
2231
mc.current_server = next;
2232
}
2233
}
2234
2235
/* XXX run network hooks "stop" here */
1473
2236
1474
2237
/* Take down the network interface */
1475
2238
if(take_down_interface){
1476
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2239
/* Re-raise priviliges */
2240
errno = 0;
2241
ret = seteuid(0);
1477
2242
if(ret == -1){
1478
perror("ioctl SIOCGIFFLAGS");
1479
} else if(network.ifr_flags & IFF_UP) {
1480
network.ifr_flags &= ~IFF_UP; /* clear flag */
1481
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1482
if(ret == -1){
1483
perror("ioctl SIOCSIFFLAGS");
1484
}
2243
perror_plus("seteuid");
1485
2244
}
1486
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1487
if(ret == -1){
1488
perror("close");
2245
if(geteuid() == 0){
2246
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCGIFFLAGS");
2249
} else if(network.ifr_flags & IFF_UP){
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2254
}
2255
}
2256
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
if(ret == -1){
2258
perror_plus("close");
2259
}
2260
/* Lower privileges permanently */
2261
errno = 0;
2262
ret = setuid(uid);
2263
if(ret == -1){
2264
perror_plus("setuid");
2265
}
1489
2266
}
1490
2267
}
1491
2268
1492
/* Removes the temp directory used by GPGME */
2269
/* Removes the GPGME temp directory and all files inside */
1493
2270
if(tempdir_created){
1494
DIR *d;
1495
struct dirent *direntry;
1496
d = opendir(tempdir);
1497
if(d == NULL){
1498
if(errno != ENOENT){
1499
perror("opendir");
1500
}
1501
} else {
1502
while(true){
1503
direntry = readdir(d);
1504
if(direntry == NULL){
1505
break;
1506
}
1507
/* Skip "." and ".." */
1508
if(direntry->d_name[0] == '.'
1509
and (direntry->d_name[1] == '\0'
1510
or (direntry->d_name[1] == '.'
1511
and direntry->d_name[2] == '\0'))){
1512
continue;
1513
}
2271
struct dirent **direntries = NULL;
2272
struct dirent *direntry = NULL;
2273
int numentries = scandir(tempdir, &direntries, notdotentries,
2274
alphasort);
2275
if (numentries > 0){
2276
for(int i = 0; i < numentries; i++){
2277
direntry = direntries[i];
1514
2278
char *fullname = NULL;
1515
2279
ret = asprintf(&fullname, "%s/%s", tempdir,
1516
2280
direntry->d_name);
1517
2281
if(ret < 0){
1518
perror("asprintf");
2282
perror_plus("asprintf");
1519
2283
continue;
1520
2284
}
1521
2285
ret = remove(fullname);
1522
2286
if(ret == -1){
1523
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1524
strerror(errno));
2287
fprintf(stderr, "Mandos plugin mandos-client: "
2288
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1525
2289
}
1526
2290
free(fullname);
1527
2291
}
1528
closedir(d);
2292
}
2293
2294
/* need to clean even if 0 because man page doesn't specify */
2295
free(direntries);
2296
if (numentries == -1){
2297
perror_plus("scandir");
1529
2298
}
1530
2299
ret = rmdir(tempdir);
1531
2300
if(ret == -1 and errno != ENOENT){
1532
perror("rmdir");
2301
perror_plus("rmdir");
1533
2302
}
1534
2303
}
1535
2304
1536
2305
if(quit_now){
1537
2306
sigemptyset(&old_sigterm_action.sa_mask);
1538
2307
old_sigterm_action.sa_handler = SIG_DFL;
1539
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2308
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2309
&old_sigterm_action,
2310
NULL));
1540
2311
if(ret == -1){
1541
perror("sigaction");
1542
}
1543
raise(signal_received);
2312
perror_plus("sigaction");
2313
}
2314
do {
2315
ret = raise(signal_received);
2316
} while(ret != 0 and errno == EINTR);
2317
if(ret != 0){
2318
perror_plus("raise");
2319
abort();
2320
}
2321
TEMP_FAILURE_RETRY(pause());
1544
2322
}
1545
2323
1546
2324
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0