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- Committer: teddy at bsnet
- Date: 2011-11-12 16:24:19 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-20111112162419-pe83skogsctxuzw7
* plugins.d/mandos-client.c: Prefix all printouts with "Mandos plugin
mandos-client: ".
* plugins.d/mandos-client.c (main): Wait for network hooks and check
the completion status.
mandos-client: ".
* plugins.d/mandos-client.c (main): Wait for network hooks and check
the completion status.
- files added:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
39
43
stdout, ferror(), remove() */
40
44
#include <stdint.h> /* uint16_t, uint32_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
44
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
50
strerror(), asprintf(), strcpy() */
49
53
sockaddr_in6, PF_INET6,
50
54
SOCK_STREAM, uid_t, gid_t, open(),
51
55
opendir(), DIR */
52
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
53
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
58
inet_pton(), connect() */
55
59
#include <fcntl.h> /* open() */
58
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
59
63
strtoimax() */
60
64
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
69
SIOCSIFFLAGS, if_indextoname(),
65
70
if_nametoindex(), IF_NAMESIZE */
67
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
73
*/
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
73
78
#include <iso646.h> /* not, or, and */
74
79
#include <argp.h> /* struct argp_option, error_t, struct
75
80
argp_state, struct argp,
76
81
argp_parse(), ARGP_KEY_ARG,
77
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
83
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
81
90
82
91
#ifdef __linux__
83
92
#include <sys/klog.h> /* klogctl() */
116
125
#define PATHDIR "/conf/conf.d/mandos"
117
126
#define SECKEY "seckey.txt"
118
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
119
129
120
130
bool debug = false;
121
131
static const char mandos_protocol_version[] = "1";
122
132
const char *argp_program_version = "mandos-client " VERSION;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
137
/* Doubly linked list that need to be circularly linked when used */
138
typedef struct server{
139
const char *ip;
140
uint16_t port;
141
AvahiIfIndex if_index;
142
int af;
143
struct timespec last_seen;
144
struct server *next;
145
struct server *prev;
146
} server;
124
147
125
148
/* Used for passing in values through the Avahi callback functions */
126
149
typedef struct {
131
154
gnutls_dh_params_t dh_params;
132
155
const char *priority;
133
156
gpgme_ctx_t ctx;
157
server *current_server;
134
158
} mandos_context;
135
159
136
160
/* global context so signal handler can reach it*/
137
161
mandos_context mc = { .simple_poll = NULL, .server = NULL,
138
162
.dh_bits = 1024, .priority = "SECURE256"
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
163
":!CTYPE-X.509:+CTYPE-OPENPGP",
164
.current_server = NULL };
165
166
sig_atomic_t quit_now = 0;
167
int signal_received = 0;
168
169
/* Function to use when printing errors */
170
void perror_plus(const char *print_text){
171
fprintf(stderr, "Mandos plugin %s: ",
172
program_invocation_short_name);
173
perror(print_text);
174
}
140
175
141
176
/*
142
177
* Make additional room in "buffer" for at least BUFFER_SIZE more
155
190
return buffer_capacity;
156
191
}
157
192
193
/* Add server to set of servers to retry periodically */
194
int add_server(const char *ip, uint16_t port,
195
AvahiIfIndex if_index,
196
int af){
197
int ret;
198
server *new_server = malloc(sizeof(server));
199
if(new_server == NULL){
200
perror_plus("malloc");
201
return -1;
202
}
203
*new_server = (server){ .ip = strdup(ip),
204
.port = port,
205
.if_index = if_index,
206
.af = af };
207
if(new_server->ip == NULL){
208
perror_plus("strdup");
209
return -1;
210
}
211
/* Special case of first server */
212
if (mc.current_server == NULL){
213
new_server->next = new_server;
214
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
217
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
220
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
229
}
230
158
231
/*
159
232
* Initialize GPGME.
160
233
*/
161
234
static bool init_gpgme(const char *seckey,
162
235
const char *pubkey, const char *tempdir){
163
int ret;
164
236
gpgme_error_t rc;
165
237
gpgme_engine_info_t engine_info;
166
238
169
241
* Helper function to insert pub and seckey to the engine keyring.
170
242
*/
171
243
bool import_key(const char *filename){
244
int ret;
172
245
int fd;
173
246
gpgme_data_t pgp_data;
174
247
175
248
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
176
249
if(fd == -1){
177
perror("open");
250
perror_plus("open");
178
251
return false;
179
252
}
180
253
181
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
182
255
if(rc != GPG_ERR_NO_ERROR){
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
184
258
gpgme_strsource(rc), gpgme_strerror(rc));
185
259
return false;
186
260
}
187
261
188
262
rc = gpgme_op_import(mc.ctx, pgp_data);
189
263
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
191
266
gpgme_strsource(rc), gpgme_strerror(rc));
192
267
return false;
193
268
}
194
269
195
270
ret = (int)TEMP_FAILURE_RETRY(close(fd));
196
271
if(ret == -1){
197
perror("close");
272
perror_plus("close");
198
273
}
199
274
gpgme_data_release(pgp_data);
200
275
return true;
201
276
}
202
277
203
278
if(debug){
204
fprintf(stderr, "Initializing GPGME\n");
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
205
281
}
206
282
207
283
/* Init GPGME */
208
284
gpgme_check_version(NULL);
209
285
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
210
286
if(rc != GPG_ERR_NO_ERROR){
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
212
289
gpgme_strsource(rc), gpgme_strerror(rc));
213
290
return false;
214
291
}
215
292
216
/* Set GPGME home directory for the OpenPGP engine only */
293
/* Set GPGME home directory for the OpenPGP engine only */
217
294
rc = gpgme_get_engine_info(&engine_info);
218
295
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
220
298
gpgme_strsource(rc), gpgme_strerror(rc));
221
299
return false;
222
300
}
229
307
engine_info = engine_info->next;
230
308
}
231
309
if(engine_info == NULL){
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
233
312
return false;
234
313
}
235
314
236
315
/* Create new GPGME "context" */
237
316
rc = gpgme_new(&(mc.ctx));
238
317
if(rc != GPG_ERR_NO_ERROR){
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
241
321
return false;
242
322
}
243
323
245
325
return false;
246
326
}
247
327
248
return true;
328
return true;
249
329
}
250
330
251
331
/*
262
342
ssize_t plaintext_length = 0;
263
343
264
344
if(debug){
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
266
347
}
267
348
268
349
/* Create new GPGME data buffer from memory cryptotext */
269
350
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
270
351
0);
271
352
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
273
355
gpgme_strsource(rc), gpgme_strerror(rc));
274
356
return -1;
275
357
}
277
359
/* Create new empty GPGME data buffer for the plaintext */
278
360
rc = gpgme_data_new(&dh_plain);
279
361
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
281
364
gpgme_strsource(rc), gpgme_strerror(rc));
282
365
gpgme_data_release(dh_crypto);
283
366
return -1;
287
370
data buffer */
288
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
289
372
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
291
375
gpgme_strsource(rc), gpgme_strerror(rc));
292
376
plaintext_length = -1;
293
377
if(debug){
294
378
gpgme_decrypt_result_t result;
295
379
result = gpgme_op_decrypt_result(mc.ctx);
296
380
if(result == NULL){
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
298
383
} else {
299
fprintf(stderr, "Unsupported algorithm: %s\n",
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
300
386
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
302
389
result->wrong_key_usage);
303
390
if(result->file_name != NULL){
304
fprintf(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
305
393
}
306
394
gpgme_recipient_t recipient;
307
395
recipient = result->recipients;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
396
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
406
recipient = recipient->next;
318
407
}
319
408
}
320
409
}
322
411
}
323
412
324
413
if(debug){
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
326
416
}
327
417
328
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
329
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
330
perror("gpgme_data_seek");
420
perror_plus("gpgme_data_seek");
331
421
plaintext_length = -1;
332
422
goto decrypt_end;
333
423
}
338
428
(size_t)plaintext_length,
339
429
plaintext_capacity);
340
430
if(plaintext_capacity == 0){
341
perror("incbuffer");
431
perror_plus("incbuffer");
342
432
plaintext_length = -1;
343
433
goto decrypt_end;
344
434
}
351
441
break;
352
442
}
353
443
if(ret < 0){
354
perror("gpgme_data_read");
444
perror_plus("gpgme_data_read");
355
445
plaintext_length = -1;
356
446
goto decrypt_end;
357
447
}
359
449
}
360
450
361
451
if(debug){
362
fprintf(stderr, "Decrypted password is: ");
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
363
454
for(ssize_t i = 0; i < plaintext_length; i++){
364
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
365
456
}
387
478
/* GnuTLS log function callback */
388
479
static void debuggnutls(__attribute__((unused)) int level,
389
480
const char* string){
390
fprintf(stderr, "GnuTLS: %s", string);
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
391
482
}
392
483
393
484
static int init_gnutls_global(const char *pubkeyfilename,
395
486
int ret;
396
487
397
488
if(debug){
398
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
399
491
}
400
492
401
493
ret = gnutls_global_init();
402
494
if(ret != GNUTLS_E_SUCCESS){
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
405
497
return -1;
406
498
}
407
499
414
506
}
415
507
416
508
/* OpenPGP credentials */
417
gnutls_certificate_allocate_credentials(&mc.cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
418
510
if(ret != GNUTLS_E_SUCCESS){
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
424
513
gnutls_global_deinit();
425
514
return -1;
426
515
}
427
516
428
517
if(debug){
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
430
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
431
521
seckeyfilename);
432
522
}
436
526
GNUTLS_OPENPGP_FMT_BASE64);
437
527
if(ret != GNUTLS_E_SUCCESS){
438
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
439
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
440
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
441
fprintf(stderr, "The GnuTLS error is: %s\n",
442
safer_gnutls_strerror(ret));
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
443
534
goto globalfail;
444
535
}
445
536
446
537
/* GnuTLS server initialization */
447
538
ret = gnutls_dh_params_init(&mc.dh_params);
448
539
if(ret != GNUTLS_E_SUCCESS){
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
450
542
" %s\n", safer_gnutls_strerror(ret));
451
543
goto globalfail;
452
544
}
453
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
454
546
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
456
549
safer_gnutls_strerror(ret));
457
550
goto globalfail;
458
551
}
472
565
static int init_gnutls_session(gnutls_session_t *session){
473
566
int ret;
474
567
/* GnuTLS session creation */
475
ret = gnutls_init(session, GNUTLS_SERVER);
568
do {
569
ret = gnutls_init(session, GNUTLS_SERVER);
570
if(quit_now){
571
return -1;
572
}
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
476
574
if(ret != GNUTLS_E_SUCCESS){
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
478
577
safer_gnutls_strerror(ret));
479
578
}
480
579
481
580
{
482
581
const char *err;
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
584
if(quit_now){
585
gnutls_deinit(*session);
586
return -1;
587
}
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
484
589
if(ret != GNUTLS_E_SUCCESS){
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
488
594
gnutls_deinit(*session);
489
595
return -1;
490
596
}
491
597
}
492
598
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
599
do {
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
602
if(quit_now){
603
gnutls_deinit(*session);
604
return -1;
605
}
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
607
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
497
610
safer_gnutls_strerror(ret));
498
611
gnutls_deinit(*session);
499
612
return -1;
500
613
}
501
614
502
615
/* ignore client certificate if any. */
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
617
506
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
507
619
516
628
static int start_mandos_communication(const char *ip, uint16_t port,
517
629
AvahiIfIndex if_index,
518
630
int af){
519
int ret, tcp_sd;
631
int ret, tcp_sd = -1;
520
632
ssize_t sret;
521
633
union {
522
634
struct sockaddr_in in;
523
635
struct sockaddr_in6 in6;
524
636
} to;
525
637
char *buffer = NULL;
526
char *decrypted_buffer;
638
char *decrypted_buffer = NULL;
527
639
size_t buffer_length = 0;
528
640
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
530
641
size_t written;
531
int retval = 0;
642
int retval = -1;
532
643
gnutls_session_t session;
533
644
int pf; /* Protocol family */
534
645
646
errno = 0;
647
648
if(quit_now){
649
errno = EINTR;
650
return -1;
651
}
652
535
653
switch(af){
536
654
case AF_INET6:
537
655
pf = PF_INET6;
540
658
pf = PF_INET;
541
659
break;
542
660
default:
543
fprintf(stderr, "Bad address family: %d\n", af);
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
663
errno = EINVAL;
544
664
return -1;
545
665
}
546
666
550
670
}
551
671
552
672
if(debug){
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
554
675
"\n", ip, port);
555
676
}
556
677
557
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
558
679
if(tcp_sd < 0){
559
perror("socket");
560
return -1;
680
int e = errno;
681
perror_plus("socket");
682
errno = e;
683
goto mandos_end;
684
}
685
686
if(quit_now){
687
errno = EINTR;
688
goto mandos_end;
561
689
}
562
690
563
691
memset(&to, 0, sizeof(to));
564
692
if(af == AF_INET6){
565
to.in6.sin6_family = (uint16_t)af;
693
to.in6.sin6_family = (sa_family_t)af;
566
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
567
695
} else { /* IPv4 */
568
696
to.in.sin_family = (sa_family_t)af;
569
697
ret = inet_pton(af, ip, &to.in.sin_addr);
570
698
}
571
699
if(ret < 0 ){
572
perror("inet_pton");
573
return -1;
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
703
goto mandos_end;
574
704
}
575
705
if(ret == 0){
576
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
710
goto mandos_end;
578
711
}
579
712
if(af == AF_INET6){
580
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
586
719
-Wunreachable-code*/
587
720
if(if_index == AVAHI_IF_UNSPEC){
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
589
723
" without a network interface\n");
590
return -1;
724
errno = EINVAL;
725
goto mandos_end;
591
726
}
592
727
/* Set the network interface number as scope */
593
728
to.in6.sin6_scope_id = (uint32_t)if_index;
598
733
-Wunreachable-code */
599
734
}
600
735
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
601
741
if(debug){
602
742
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
743
char interface[IF_NAMESIZE];
604
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
605
perror("if_indextoname");
745
perror_plus("if_indextoname");
606
746
} else {
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
608
749
ip, interface, port);
609
750
}
610
751
} else {
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
613
754
}
614
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
615
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
622
763
sizeof(addrstr));
623
764
}
624
765
if(pcret == NULL){
625
perror("inet_ntop");
766
perror_plus("inet_ntop");
626
767
} else {
627
768
if(strcmp(addrstr, ip) != 0){
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
629
771
}
630
772
}
631
773
}
632
774
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
779
633
780
if(af == AF_INET6){
634
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
635
782
} else {
636
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
637
784
}
638
785
if(ret < 0){
639
perror("connect");
640
return -1;
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
791
goto mandos_end;
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
641
797
}
642
798
643
799
const char *out = mandos_protocol_version;
647
803
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
804
out_size - written));
649
805
if(ret == -1){
650
perror("write");
651
retval = -1;
806
int e = errno;
807
perror_plus("write");
808
errno = e;
652
809
goto mandos_end;
653
810
}
654
811
written += (size_t)ret;
662
819
break;
663
820
}
664
821
}
822
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
665
827
}
666
828
667
829
if(debug){
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
}
670
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
832
}
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
/* Spurious warning from -Wint-to-pointer-cast */
671
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
841
673
do{
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
do {
674
848
ret = gnutls_handshake(session);
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
675
853
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
676
854
677
855
if(ret != GNUTLS_E_SUCCESS){
678
856
if(debug){
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
680
859
gnutls_perror(ret);
681
860
}
682
retval = -1;
861
errno = EPROTO;
683
862
goto mandos_end;
684
863
}
685
864
686
865
/* Read OpenPGP packet that contains the wanted password */
687
866
688
867
if(debug){
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
690
ip);
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
691
870
}
692
871
693
872
while(true){
873
874
if(quit_now){
875
errno = EINTR;
876
goto mandos_end;
877
}
878
694
879
buffer_capacity = incbuffer(&buffer, buffer_length,
695
880
buffer_capacity);
696
881
if(buffer_capacity == 0){
697
perror("incbuffer");
698
retval = -1;
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
885
goto mandos_end;
886
}
887
888
if(quit_now){
889
errno = EINTR;
699
890
goto mandos_end;
700
891
}
701
892
710
901
case GNUTLS_E_AGAIN:
711
902
break;
712
903
case GNUTLS_E_REHANDSHAKE:
713
do{
904
do {
714
905
ret = gnutls_handshake(session);
906
907
if(quit_now){
908
errno = EINTR;
909
goto mandos_end;
910
}
715
911
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
716
912
if(ret < 0){
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
718
915
gnutls_perror(ret);
719
retval = -1;
916
errno = EPROTO;
720
917
goto mandos_end;
721
918
}
722
919
break;
723
920
default:
724
fprintf(stderr, "Unknown error while reading data from"
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
725
923
" encrypted session with Mandos server\n");
726
retval = -1;
727
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
728
926
goto mandos_end;
729
927
}
730
928
} else {
733
931
}
734
932
735
933
if(debug){
736
fprintf(stderr, "Closing TLS session\n");
737
}
738
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
936
}
937
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
do {
944
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
950
741
951
if(buffer_length > 0){
952
ssize_t decrypted_buffer_size;
742
953
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
954
buffer_length,
744
955
&decrypted_buffer);
745
956
if(decrypted_buffer_size >= 0){
957
746
958
written = 0;
747
959
while(written < (size_t) decrypted_buffer_size){
960
if(quit_now){
961
errno = EINTR;
962
goto mandos_end;
963
}
964
748
965
ret = (int)fwrite(decrypted_buffer + written, 1,
749
966
(size_t)decrypted_buffer_size - written,
750
967
stdout);
751
968
if(ret == 0 and ferror(stdout)){
969
int e = errno;
752
970
if(debug){
753
fprintf(stderr, "Error writing encrypted data: %s\n",
971
fprintf(stderr, "Mandos plugin mandos-client: "
972
"Error writing encrypted data: %s\n",
754
973
strerror(errno));
755
974
}
756
retval = -1;
757
break;
975
errno = e;
976
goto mandos_end;
758
977
}
759
978
written += (size_t)ret;
760
979
}
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
980
retval = 0;
764
981
}
765
} else {
766
retval = -1;
767
982
}
768
983
769
984
/* Shutdown procedure */
770
985
771
986
mandos_end:
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
987
{
988
int e = errno;
989
free(decrypted_buffer);
990
free(buffer);
991
if(tcp_sd >= 0){
992
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
993
}
994
if(ret == -1){
995
if(e == 0){
996
e = errno;
997
}
998
perror_plus("close");
999
}
1000
gnutls_deinit(session);
1001
errno = e;
1002
if(quit_now){
1003
errno = EINTR;
1004
retval = -1;
1005
}
776
1006
}
777
gnutls_deinit(session);
778
1007
return retval;
779
1008
}
780
1009
797
1026
/* Called whenever a service has been resolved successfully or
798
1027
timed out */
799
1028
1029
if(quit_now){
1030
return;
1031
}
1032
800
1033
switch(event){
801
1034
default:
802
1035
case AVAHI_RESOLVER_FAILURE:
803
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1036
fprintf(stderr, "Mandos plugin mandos-client: "
1037
"(Avahi Resolver) Failed to resolve service '%s'"
804
1038
" of type '%s' in domain '%s': %s\n", name, type, domain,
805
1039
avahi_strerror(avahi_server_errno(mc.server)));
806
1040
break;
810
1044
char ip[AVAHI_ADDRESS_STR_MAX];
811
1045
avahi_address_snprint(ip, sizeof(ip), address);
812
1046
if(debug){
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1047
fprintf(stderr, "Mandos plugin mandos-client: "
1048
"Mandos server \"%s\" found on %s (%s, %"
814
1049
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
1050
ip, (intmax_t)interface, port);
816
1051
}
818
1053
avahi_proto_to_af(proto));
819
1054
if(ret == 0){
820
1055
avahi_simple_poll_quit(mc.simple_poll);
1056
} else {
1057
ret = add_server(ip, port, interface,
1058
avahi_proto_to_af(proto));
821
1059
}
822
1060
}
823
1061
}
839
1077
/* Called whenever a new services becomes available on the LAN or
840
1078
is removed from the LAN */
841
1079
1080
if(quit_now){
1081
return;
1082
}
1083
842
1084
switch(event){
843
1085
default:
844
1086
case AVAHI_BROWSER_FAILURE:
845
1087
846
fprintf(stderr, "(Avahi browser) %s\n",
1088
fprintf(stderr, "Mandos plugin mandos-client: "
1089
"(Avahi browser) %s\n",
847
1090
avahi_strerror(avahi_server_errno(mc.server)));
848
1091
avahi_simple_poll_quit(mc.simple_poll);
849
1092
return;
854
1097
the callback function is called the Avahi server will free the
855
1098
resolver for us. */
856
1099
857
if(!(avahi_s_service_resolver_new(mc.server, interface,
858
protocol, name, type, domain,
859
AVAHI_PROTO_INET6, 0,
860
resolve_callback, NULL)))
861
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1100
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1101
name, type, domain, protocol, 0,
1102
resolve_callback, NULL) == NULL)
1103
fprintf(stderr, "Mandos plugin mandos-client: "
1104
"Avahi: Failed to resolve service '%s': %s\n",
862
1105
name, avahi_strerror(avahi_server_errno(mc.server)));
863
1106
break;
864
1107
868
1111
case AVAHI_BROWSER_ALL_FOR_NOW:
869
1112
case AVAHI_BROWSER_CACHE_EXHAUSTED:
870
1113
if(debug){
871
fprintf(stderr, "No Mandos server found, still searching...\n");
1114
fprintf(stderr, "Mandos plugin mandos-client: "
1115
"No Mandos server found, still searching...\n");
872
1116
}
873
1117
break;
874
1118
}
875
1119
}
876
1120
877
sig_atomic_t quit_now = 0;
878
879
/* stop main loop after sigterm has been called */
880
static void handle_sigterm(__attribute__((unused)) int sig){
1121
/* Signal handler that stops main loop after SIGTERM */
1122
static void handle_sigterm(int sig){
881
1123
if(quit_now){
882
1124
return;
883
1125
}
884
1126
quit_now = 1;
1127
signal_received = sig;
885
1128
int old_errno = errno;
1129
/* set main loop to exit */
886
1130
if(mc.simple_poll != NULL){
887
1131
avahi_simple_poll_quit(mc.simple_poll);
888
1132
}
889
1133
errno = old_errno;
890
1134
}
891
1135
1136
bool get_flags(const char *ifname, struct ifreq *ifr){
1137
int ret;
1138
1139
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1140
if(s < 0){
1141
perror_plus("socket");
1142
return false;
1143
}
1144
strcpy(ifr->ifr_name, ifname);
1145
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1146
if(ret == -1){
1147
if(debug){
1148
perror_plus("ioctl SIOCGIFFLAGS");
1149
}
1150
return false;
1151
}
1152
return true;
1153
}
1154
1155
bool good_flags(const char *ifname, const struct ifreq *ifr){
1156
1157
/* Reject the loopback device */
1158
if(ifr->ifr_flags & IFF_LOOPBACK){
1159
if(debug){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1162
}
1163
return false;
1164
}
1165
/* Accept point-to-point devices only if connect_to is specified */
1166
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1167
if(debug){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1170
}
1171
return true;
1172
}
1173
/* Otherwise, reject non-broadcast-capable devices */
1174
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1175
if(debug){
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1178
}
1179
return false;
1180
}
1181
/* Reject non-ARP interfaces (including dummy interfaces) */
1182
if(ifr->ifr_flags & IFF_NOARP){
1183
if(debug){
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1186
}
1187
return false;
1188
}
1189
1190
/* Accept this device */
1191
if(debug){
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1194
}
1195
return true;
1196
}
1197
1198
/*
1199
* This function determines if a directory entry in /sys/class/net
1200
* corresponds to an acceptable network device.
1201
* (This function is passed to scandir(3) as a filter function.)
1202
*/
1203
int good_interface(const struct dirent *if_entry){
1204
if(if_entry->d_name[0] == '.'){
1205
return 0;
1206
}
1207
1208
struct ifreq ifr;
1209
if(not get_flags(if_entry->d_name, &ifr)){
1210
if(debug){
1211
fprintf(stderr, "Mandos plugin mandos-client: "
1212
"Failed to get flags for interface \"%s\"\n",
1213
if_entry->d_name);
1214
}
1215
return 0;
1216
}
1217
1218
if(not good_flags(if_entry->d_name, &ifr)){
1219
return 0;
1220
}
1221
return 1;
1222
}
1223
1224
/*
1225
* This function determines if a directory entry in /sys/class/net
1226
* corresponds to an acceptable network device which is up.
1227
* (This function is passed to scandir(3) as a filter function.)
1228
*/
1229
int up_interface(const struct dirent *if_entry){
1230
if(if_entry->d_name[0] == '.'){
1231
return 0;
1232
}
1233
1234
struct ifreq ifr;
1235
if(not get_flags(if_entry->d_name, &ifr)){
1236
if(debug){
1237
fprintf(stderr, "Mandos plugin mandos-client: "
1238
"Failed to get flags for interface \"%s\"\n",
1239
if_entry->d_name);
1240
}
1241
return 0;
1242
}
1243
1244
/* Reject down interfaces */
1245
if(not (ifr.ifr_flags & IFF_UP)){
1246
if(debug){
1247
fprintf(stderr, "Mandos plugin mandos-client: "
1248
"Rejecting down interface \"%s\"\n",
1249
if_entry->d_name);
1250
}
1251
return 0;
1252
}
1253
1254
/* Reject non-running interfaces */
1255
if(not (ifr.ifr_flags & IFF_RUNNING)){
1256
if(debug){
1257
fprintf(stderr, "Mandos plugin mandos-client: "
1258
"Rejecting non-running interface \"%s\"\n",
1259
if_entry->d_name);
1260
}
1261
return 0;
1262
}
1263
1264
if(not good_flags(if_entry->d_name, &ifr)){
1265
return 0;
1266
}
1267
return 1;
1268
}
1269
1270
int notdotentries(const struct dirent *direntry){
1271
/* Skip "." and ".." */
1272
if(direntry->d_name[0] == '.'
1273
and (direntry->d_name[1] == '\0'
1274
or (direntry->d_name[1] == '.'
1275
and direntry->d_name[2] == '\0'))){
1276
return 0;
1277
}
1278
return 1;
1279
}
1280
1281
/* Is this directory entry a runnable program? */
1282
int runnable_hook(const struct dirent *direntry){
1283
int ret;
1284
struct stat st;
1285
1286
if((direntry->d_name)[0] == '\0'){
1287
/* Empty name? */
1288
return 0;
1289
}
1290
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1293
1294
if(*end == '~'){
1295
/* Backup name~ */
1296
return 0;
1297
}
1298
1299
if(((direntry->d_name)[0] == '#')
1300
and (*end == '#')){
1301
/* Temporary #name# */
1302
return 0;
1303
}
1304
1305
/* XXX more rules here */
1306
1307
ret = stat(direntry->d_name, &st);
1308
if(ret == -1){
1309
if(debug){
1310
perror_plus("Could not stat plugin");
1311
}
1312
return 0;
1313
}
1314
if(not (S_ISREG(st.st_mode))){
1315
/* Not a regular file */
1316
return 0;
1317
}
1318
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1319
/* Not executable */
1320
return 0;
1321
}
1322
return 1;
1323
}
1324
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1326
int ret;
1327
struct timespec now;
1328
struct timespec waited_time;
1329
intmax_t block_time;
1330
1331
while(true){
1332
if(mc.current_server == NULL){
1333
if (debug){
1334
fprintf(stderr, "Mandos plugin mandos-client: "
1335
"Wait until first server is found. No timeout!\n");
1336
}
1337
ret = avahi_simple_poll_iterate(s, -1);
1338
} else {
1339
if (debug){
1340
fprintf(stderr, "Mandos plugin mandos-client: "
1341
"Check current_server if we should run it,"
1342
" or wait\n");
1343
}
1344
/* the current time */
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1346
if(ret == -1){
1347
perror_plus("clock_gettime");
1348
return -1;
1349
}
1350
/* Calculating in ms how long time between now and server
1351
who we visted longest time ago. Now - last seen. */
1352
waited_time.tv_sec = (now.tv_sec
1353
- mc.current_server->last_seen.tv_sec);
1354
waited_time.tv_nsec = (now.tv_nsec
1355
- mc.current_server->last_seen.tv_nsec);
1356
/* total time is 10s/10,000ms.
1357
Converting to s from ms by dividing by 1,000,
1358
and ns to ms by dividing by 1,000,000. */
1359
block_time = ((retry_interval
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
1363
if (debug){
1364
fprintf(stderr, "Mandos plugin mandos-client: "
1365
"Blocking for %" PRIdMAX " ms\n", block_time);
1366
}
1367
1368
if(block_time <= 0){
1369
ret = start_mandos_communication(mc.current_server->ip,
1370
mc.current_server->port,
1371
mc.current_server->if_index,
1372
mc.current_server->af);
1373
if(ret == 0){
1374
avahi_simple_poll_quit(mc.simple_poll);
1375
return 0;
1376
}
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc.current_server->last_seen);
1379
if(ret == -1){
1380
perror_plus("clock_gettime");
1381
return -1;
1382
}
1383
mc.current_server = mc.current_server->next;
1384
block_time = 0; /* Call avahi to find new Mandos
1385
servers, but don't block */
1386
}
1387
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1389
}
1390
if(ret != 0){
1391
if (ret > 0 or errno != EINTR){
1392
return (ret != 1) ? ret : 0;
1393
}
1394
}
1395
}
1396
}
1397
892
1398
int main(int argc, char *argv[]){
893
1399
AvahiSServiceBrowser *sb = NULL;
894
1400
int error;
896
1402
intmax_t tmpmax;
897
1403
char *tmp;
898
1404
int exitcode = EXIT_SUCCESS;
899
const char *interface = "eth0";
1405
const char *interface = "";
900
1406
struct ifreq network;
901
int sd;
1407
int sd = -1;
1408
bool take_down_interface = false;
902
1409
uid_t uid;
903
1410
gid_t gid;
904
char *connect_to = NULL;
905
1411
char tempdir[] = "/tmp/mandosXXXXXX";
906
1412
bool tempdir_created = false;
907
1413
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
908
1414
const char *seckey = PATHDIR "/" SECKEY;
909
1415
const char *pubkey = PATHDIR "/" PUBKEY;
910
1416
911
/* Initialize Mandos context */
912
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
913
.dh_bits = 1024, .priority = "SECURE256"
914
":!CTYPE-X.509:+CTYPE-OPENPGP" };
915
1417
bool gnutls_initialized = false;
916
1418
bool gpgme_initialized = false;
917
1419
float delay = 2.5f;
1420
double retry_interval = 10; /* 10s between trying a server and
1421
retrying the same server again */
918
1422
919
struct sigaction old_sigterm_action;
1423
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
920
1424
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
921
1425
1426
uid = getuid();
1427
gid = getgid();
1428
1429
/* Lower any group privileges we might have, just to be safe */
1430
errno = 0;
1431
ret = setgid(gid);
1432
if(ret == -1){
1433
perror_plus("setgid");
1434
}
1435
1436
/* Lower user privileges (temporarily) */
1437
errno = 0;
1438
ret = seteuid(uid);
1439
if(ret == -1){
1440
perror_plus("seteuid");
1441
}
1442
1443
if(quit_now){
1444
goto end;
1445
}
1446
922
1447
{
923
1448
struct argp_option options[] = {
924
1449
{ .name = "debug", .key = 128,
953
1478
.arg = "SECONDS",
954
1479
.doc = "Maximum delay to wait for interface startup",
955
1480
.group = 2 },
1481
{ .name = "retry", .key = 132,
1482
.arg = "SECONDS",
1483
.doc = "Retry interval used when denied by the mandos server",
1484
.group = 2 },
1485
/*
1486
* These reproduce what we would get without ARGP_NO_HELP
1487
*/
1488
{ .name = "help", .key = '?',
1489
.doc = "Give this help list", .group = -1 },
1490
{ .name = "usage", .key = -3,
1491
.doc = "Give a short usage message", .group = -1 },
1492
{ .name = "version", .key = 'V',
1493
.doc = "Print program version", .group = -1 },
956
1494
{ .name = NULL }
957
1495
};
958
1496
959
1497
error_t parse_opt(int key, char *arg,
960
1498
struct argp_state *state){
1499
errno = 0;
961
1500
switch(key){
962
1501
case 128: /* --debug */
963
1502
debug = true;
979
1518
tmpmax = strtoimax(arg, &tmp, 10);
980
1519
if(errno != 0 or tmp == arg or *tmp != '\0'
981
1520
or tmpmax != (typeof(mc.dh_bits))tmpmax){
982
fprintf(stderr, "Bad number of DH bits\n");
983
exit(EXIT_FAILURE);
1521
argp_error(state, "Bad number of DH bits");
984
1522
}
985
1523
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
986
1524
break;
991
1529
errno = 0;
992
1530
delay = strtof(arg, &tmp);
993
1531
if(errno != 0 or tmp == arg or *tmp != '\0'){
994
fprintf(stderr, "Bad delay\n");
995
exit(EXIT_FAILURE);
1532
argp_error(state, "Bad delay");
1533
}
1534
case 132: /* --retry */
1535
errno = 0;
1536
retry_interval = strtod(arg, &tmp);
1537
if(errno != 0 or tmp == arg or *tmp != '\0'
1538
or (retry_interval * 1000) > INT_MAX
1539
or retry_interval < 0){
1540
argp_error(state, "Bad retry interval");
996
1541
}
997
1542
break;
998
case ARGP_KEY_ARG:
999
argp_usage(state);
1000
case ARGP_KEY_END:
1543
/*
1544
* These reproduce what we would get without ARGP_NO_HELP
1545
*/
1546
case '?': /* --help */
1547
argp_state_help(state, state->out_stream,
1548
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1549
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1550
case -3: /* --usage */
1551
argp_state_help(state, state->out_stream,
1552
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1553
case 'V': /* --version */
1554
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1555
fprintf(state->out_stream, "%s\n", argp_program_version);
1556
exit(argp_err_exit_status);
1001
1557
break;
1002
1558
default:
1003
1559
return ARGP_ERR_UNKNOWN;
1004
1560
}
1005
return 0;
1561
return errno;
1006
1562
}
1007
1563
1008
1564
struct argp argp = { .options = options, .parser = parse_opt,
1009
1565
.args_doc = "",
1010
1566
.doc = "Mandos client -- Get and decrypt"
1011
1567
" passwords from a Mandos server" };
1012
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1013
if(ret == ARGP_ERR_UNKNOWN){
1014
fprintf(stderr, "Unknown error while parsing arguments\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1568
ret = argp_parse(&argp, argc, argv,
1569
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1570
switch(ret){
1571
case 0:
1572
break;
1573
case ENOMEM:
1574
default:
1575
errno = ret;
1576
perror_plus("argp_parse");
1577
exitcode = EX_OSERR;
1578
goto end;
1579
case EINVAL:
1580
exitcode = EX_USAGE;
1581
goto end;
1582
}
1583
}
1584
1585
{
1586
/* Work around Debian bug #633582:
1587
<http://bugs.debian.org/633582> */
1588
struct stat st;
1589
1590
/* Re-raise priviliges */
1591
errno = 0;
1592
ret = seteuid(0);
1593
if(ret == -1){
1594
perror_plus("seteuid");
1595
}
1596
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1601
} else {
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1603
if(ret == -1){
1604
perror_plus("fstat");
1605
} else {
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1608
if(ret == -1){
1609
perror_plus("fchown");
1610
}
1611
}
1612
}
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1614
}
1615
}
1616
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1621
} else {
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1623
if(ret == -1){
1624
perror_plus("fstat");
1625
} else {
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1628
if(ret == -1){
1629
perror_plus("fchown");
1630
}
1631
}
1632
}
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1634
}
1635
}
1636
1637
/* Lower privileges */
1638
errno = 0;
1639
ret = seteuid(uid);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
}
1644
1645
/* Find network hooks and run them */
1646
{
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1650
alphasort);
1651
if(numhooks == -1){
1652
perror_plus("scandir");
1653
} else {
1654
int devnull = open("/dev/null", O_RDONLY);
1655
for(int i = 0; i < numhooks; i++){
1656
direntry = direntries[0];
1657
char *fullname = NULL;
1658
ret = asprintf(&fullname, "%s/%s", tempdir,
1659
direntry->d_name);
1660
if(ret < 0){
1661
perror_plus("asprintf");
1662
continue;
1663
}
1664
pid_t hook_pid = fork();
1665
if(hook_pid == 0){
1666
/* Child */
1667
dup2(devnull, STDIN_FILENO);
1668
close(devnull);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1671
if(ret == -1){
1672
perror_plus("setenv");
1673
exit(1);
1674
}
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1676
if(ret == -1){
1677
perror_plus("setenv");
1678
exit(1);
1679
}
1680
ret = setenv("MODE", "start", 1);
1681
if(ret == -1){
1682
perror_plus("setenv");
1683
exit(1);
1684
}
1685
char *delaystring;
1686
ret = asprintf(&delaystring, "%f", delay);
1687
if(ret == -1){
1688
perror_plus("asprintf");
1689
exit(1);
1690
}
1691
ret = setenv("DELAY", delaystring, 1);
1692
if(ret == -1){
1693
free(delaystring);
1694
perror_plus("setenv");
1695
exit(1);
1696
}
1697
free(delaystring);
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1700
} else {
1701
int status;
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1704
free(fullname);
1705
continue;
1706
}
1707
if(WIFEXITED(status)){
1708
if(WEXITSTATUS(status) != 0){
1709
fprintf(stderr, "Mandos plugin mandos-client: "
1710
"Warning: network hook \"%s\" exited"
1711
" with status %d\n", direntry->d_name,
1712
WEXITSTATUS(status));
1713
free(fullname);
1714
continue;
1715
}
1716
} else if(WIFSIGNALED(status)){
1717
fprintf(stderr, "Mandos plugin mandos-client: "
1718
"Warning: network hook \"%s\" died by"
1719
" signal %d\n", direntry->d_name,
1720
WTERMSIG(status));
1721
free(fullname);
1722
continue;
1723
} else {
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
1726
direntry->d_name);
1727
free(fullname);
1728
continue;
1729
}
1730
}
1731
free(fullname);
1732
if(quit_now){
1733
goto end;
1734
}
1735
}
1736
close(devnull);
1017
1737
}
1018
1738
}
1019
1739
1021
1741
avahi_set_log_function(empty_log);
1022
1742
}
1023
1743
1744
if(interface[0] == '\0'){
1745
struct dirent **direntries;
1746
/* First look for interfaces that are up */
1747
ret = scandir(sys_class_net, &direntries, up_interface,
1748
alphasort);
1749
if(ret == 0){
1750
/* No up interfaces, look for any good interfaces */
1751
free(direntries);
1752
ret = scandir(sys_class_net, &direntries, good_interface,
1753
alphasort);
1754
}
1755
if(ret >= 1){
1756
/* Pick the first interface returned */
1757
interface = strdup(direntries[0]->d_name);
1758
if(debug){
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1761
}
1762
if(interface == NULL){
1763
perror_plus("malloc");
1764
free(direntries);
1765
exitcode = EXIT_FAILURE;
1766
goto end;
1767
}
1768
free(direntries);
1769
} else {
1770
free(direntries);
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"Could not find a network interface\n");
1773
exitcode = EXIT_FAILURE;
1774
goto end;
1775
}
1776
}
1777
1024
1778
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1025
1779
from the signal handler */
1026
1780
/* Initialize the pseudo-RNG for Avahi */
1027
1781
srand((unsigned int) time(NULL));
1028
1782
mc.simple_poll = avahi_simple_poll_new();
1029
1783
if(mc.simple_poll == NULL){
1030
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1031
exitcode = EXIT_FAILURE;
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
1786
exitcode = EX_UNAVAILABLE;
1032
1787
goto end;
1033
1788
}
1034
1789
1035
1790
sigemptyset(&sigterm_action.sa_mask);
1036
1791
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1037
1792
if(ret == -1){
1038
perror("sigaddset");
1039
exitcode = EXIT_FAILURE;
1793
perror_plus("sigaddset");
1794
exitcode = EX_OSERR;
1040
1795
goto end;
1041
1796
}
1042
1797
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1043
1798
if(ret == -1){
1044
perror("sigaddset");
1045
exitcode = EXIT_FAILURE;
1799
perror_plus("sigaddset");
1800
exitcode = EX_OSERR;
1046
1801
goto end;
1047
1802
}
1048
1803
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1049
1804
if(ret == -1){
1050
perror("sigaddset");
1051
exitcode = EXIT_FAILURE;
1052
goto end;
1053
}
1054
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1055
if(ret == -1){
1056
perror("sigaction");
1057
exitcode = EXIT_FAILURE;
1058
goto end;
1059
}
1805
perror_plus("sigaddset");
1806
exitcode = EX_OSERR;
1807
goto end;
1808
}
1809
/* Need to check if the handler is SIG_IGN before handling:
1810
| [[info:libc:Initial Signal Actions]] |
1811
| [[info:libc:Basic Signal Handling]] |
1812
*/
1813
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1814
if(ret == -1){
1815
perror_plus("sigaction");
1816
return EX_OSERR;
1817
}
1818
if(old_sigterm_action.sa_handler != SIG_IGN){
1819
ret = sigaction(SIGINT, &sigterm_action, NULL);
1820
if(ret == -1){
1821
perror_plus("sigaction");
1822
exitcode = EX_OSERR;
1823
goto end;
1824
}
1825
}
1826
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1827
if(ret == -1){
1828
perror_plus("sigaction");
1829
return EX_OSERR;
1830
}
1831
if(old_sigterm_action.sa_handler != SIG_IGN){
1832
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1833
if(ret == -1){
1834
perror_plus("sigaction");
1835
exitcode = EX_OSERR;
1836
goto end;
1837
}
1838
}
1839
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1840
if(ret == -1){
1841
perror_plus("sigaction");
1842
return EX_OSERR;
1843
}
1844
if(old_sigterm_action.sa_handler != SIG_IGN){
1845
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1846
if(ret == -1){
1847
perror_plus("sigaction");
1848
exitcode = EX_OSERR;
1849
goto end;
1850
}
1851
}
1060
1852
1061
1853
/* If the interface is down, bring it up */
1062
if(interface[0] != '\0'){
1854
if(strcmp(interface, "none") != 0){
1855
if_index = (AvahiIfIndex) if_nametoindex(interface);
1856
if(if_index == 0){
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1859
exitcode = EX_UNAVAILABLE;
1860
goto end;
1861
}
1862
1863
if(quit_now){
1864
goto end;
1865
}
1866
1867
/* Re-raise priviliges */
1868
errno = 0;
1869
ret = seteuid(0);
1870
if(ret == -1){
1871
perror_plus("seteuid");
1872
}
1873
1063
1874
#ifdef __linux__
1064
1875
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1065
messages to mess up the prompt */
1876
messages about the network interface to mess up the prompt */
1066
1877
ret = klogctl(8, NULL, 5);
1067
1878
bool restore_loglevel = true;
1068
1879
if(ret == -1){
1069
1880
restore_loglevel = false;
1070
perror("klogctl");
1881
perror_plus("klogctl");
1071
1882
}
1072
1883
#endif /* __linux__ */
1073
1884
1074
1885
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1075
1886
if(sd < 0){
1076
perror("socket");
1077
exitcode = EXIT_FAILURE;
1887
perror_plus("socket");
1888
exitcode = EX_OSERR;
1078
1889
#ifdef __linux__
1079
1890
if(restore_loglevel){
1080
1891
ret = klogctl(7, NULL, 0);
1081
1892
if(ret == -1){
1082
perror("klogctl");
1893
perror_plus("klogctl");
1083
1894
}
1084
1895
}
1085
1896
#endif /* __linux__ */
1897
/* Lower privileges */
1898
errno = 0;
1899
ret = seteuid(uid);
1900
if(ret == -1){
1901
perror_plus("seteuid");
1902
}
1086
1903
goto end;
1087
1904
}
1088
1905
strcpy(network.ifr_name, interface);
1089
1906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1090
1907
if(ret == -1){
1091
perror("ioctl SIOCGIFFLAGS");
1908
perror_plus("ioctl SIOCGIFFLAGS");
1092
1909
#ifdef __linux__
1093
1910
if(restore_loglevel){
1094
1911
ret = klogctl(7, NULL, 0);
1095
1912
if(ret == -1){
1096
perror("klogctl");
1913
perror_plus("klogctl");
1097
1914
}
1098
1915
}
1099
1916
#endif /* __linux__ */
1100
exitcode = EXIT_FAILURE;
1917
exitcode = EX_OSERR;
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1101
1924
goto end;
1102
1925
}
1103
1926
if((network.ifr_flags & IFF_UP) == 0){
1104
1927
network.ifr_flags |= IFF_UP;
1928
take_down_interface = true;
1105
1929
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1106
1930
if(ret == -1){
1107
perror("ioctl SIOCSIFFLAGS");
1108
exitcode = EXIT_FAILURE;
1931
take_down_interface = false;
1932
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1933
exitcode = EX_OSERR;
1109
1934
#ifdef __linux__
1110
1935
if(restore_loglevel){
1111
1936
ret = klogctl(7, NULL, 0);
1112
1937
if(ret == -1){
1113
perror("klogctl");
1938
perror_plus("klogctl");
1114
1939
}
1115
1940
}
1116
1941
#endif /* __linux__ */
1942
/* Lower privileges */
1943
errno = 0;
1944
ret = seteuid(uid);
1945
if(ret == -1){
1946
perror_plus("seteuid");
1947
}
1117
1948
goto end;
1118
1949
}
1119
1950
}
1120
/* sleep checking until interface is running */
1951
/* Sleep checking until interface is running.
1952
Check every 0.25s, up to total time of delay */
1121
1953
for(int i=0; i < delay * 4; i++){
1122
1954
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1123
1955
if(ret == -1){
1124
perror("ioctl SIOCGIFFLAGS");
1956
perror_plus("ioctl SIOCGIFFLAGS");
1125
1957
} else if(network.ifr_flags & IFF_RUNNING){
1126
1958
break;
1127
1959
}
1128
1960
struct timespec sleeptime = { .tv_nsec = 250000000 };
1129
1961
ret = nanosleep(&sleeptime, NULL);
1130
1962
if(ret == -1 and errno != EINTR){
1131
perror("nanosleep");
1963
perror_plus("nanosleep");
1132
1964
}
1133
1965
}
1134
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1135
if(ret == -1){
1136
perror("close");
1966
if(not take_down_interface){
1967
/* We won't need the socket anymore */
1968
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1969
if(ret == -1){
1970
perror_plus("close");
1971
}
1137
1972
}
1138
1973
#ifdef __linux__
1139
1974
if(restore_loglevel){
1140
1975
/* Restores kernel loglevel to default */
1141
1976
ret = klogctl(7, NULL, 0);
1142
1977
if(ret == -1){
1143
perror("klogctl");
1978
perror_plus("klogctl");
1144
1979
}
1145
1980
}
1146
1981
#endif /* __linux__ */
1147
}
1148
1149
uid = getuid();
1150
gid = getgid();
1151
1152
errno = 0;
1153
setgid(gid);
1154
if(ret == -1){
1155
perror("setgid");
1156
}
1157
1158
ret = setuid(uid);
1159
if(ret == -1){
1160
perror("setuid");
1982
/* Lower privileges */
1983
errno = 0;
1984
if(take_down_interface){
1985
/* Lower privileges */
1986
ret = seteuid(uid);
1987
if(ret == -1){
1988
perror_plus("seteuid");
1989
}
1990
} else {
1991
/* Lower privileges permanently */
1992
ret = setuid(uid);
1993
if(ret == -1){
1994
perror_plus("setuid");
1995
}
1996
}
1997
}
1998
1999
if(quit_now){
2000
goto end;
1161
2001
}
1162
2002
1163
2003
ret = init_gnutls_global(pubkey, seckey);
1164
2004
if(ret == -1){
1165
fprintf(stderr, "init_gnutls_global failed\n");
1166
exitcode = EXIT_FAILURE;
2005
fprintf(stderr, "Mandos plugin mandos-client: "
2006
"init_gnutls_global failed\n");
2007
exitcode = EX_UNAVAILABLE;
1167
2008
goto end;
1168
2009
} else {
1169
2010
gnutls_initialized = true;
1170
2011
}
1171
2012
2013
if(quit_now){
2014
goto end;
2015
}
2016
1172
2017
if(mkdtemp(tempdir) == NULL){
1173
perror("mkdtemp");
2018
perror_plus("mkdtemp");
1174
2019
goto end;
1175
2020
}
1176
2021
tempdir_created = true;
1177
2022
2023
if(quit_now){
2024
goto end;
2025
}
2026
1178
2027
if(not init_gpgme(pubkey, seckey, tempdir)){
1179
fprintf(stderr, "init_gpgme failed\n");
1180
exitcode = EXIT_FAILURE;
2028
fprintf(stderr, "Mandos plugin mandos-client: "
2029
"init_gpgme failed\n");
2030
exitcode = EX_UNAVAILABLE;
1181
2031
goto end;
1182
2032
} else {
1183
2033
gpgme_initialized = true;
1184
2034
}
1185
2035
1186
if(interface[0] != '\0'){
1187
if_index = (AvahiIfIndex) if_nametoindex(interface);
1188
if(if_index == 0){
1189
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1190
exitcode = EXIT_FAILURE;
1191
goto end;
1192
}
2036
if(quit_now){
2037
goto end;
1193
2038
}
1194
2039
1195
2040
if(connect_to != NULL){
1197
2042
/* (Mainly meant for debugging) */
1198
2043
char *address = strrchr(connect_to, ':');
1199
2044
if(address == NULL){
1200
fprintf(stderr, "No colon in address\n");
1201
exitcode = EXIT_FAILURE;
1202
goto end;
1203
}
2045
fprintf(stderr, "Mandos plugin mandos-client: "
2046
"No colon in address\n");
2047
exitcode = EX_USAGE;
2048
goto end;
2049
}
2050
2051
if(quit_now){
2052
goto end;
2053
}
2054
1204
2055
uint16_t port;
1205
2056
errno = 0;
1206
2057
tmpmax = strtoimax(address+1, &tmp, 10);
1207
2058
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1208
2059
or tmpmax != (uint16_t)tmpmax){
1209
fprintf(stderr, "Bad port number\n");
1210
exitcode = EXIT_FAILURE;
1211
goto end;
1212
}
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"Bad port number\n");
2062
exitcode = EX_USAGE;
2063
goto end;
2064
}
2065
2066
if(quit_now){
2067
goto end;
2068
}
2069
1213
2070
port = (uint16_t)tmpmax;
1214
2071
*address = '\0';
1215
address = connect_to;
1216
2072
/* Colon in address indicates IPv6 */
1217
2073
int af;
1218
if(strchr(address, ':') != NULL){
2074
if(strchr(connect_to, ':') != NULL){
1219
2075
af = AF_INET6;
2076
/* Accept [] around IPv6 address - see RFC 5952 */
2077
if(connect_to[0] == '[' and address[-1] == ']')
2078
{
2079
connect_to++;
2080
address[-1] = '\0';
2081
}
1220
2082
} else {
1221
2083
af = AF_INET;
1222
2084
}
1223
ret = start_mandos_communication(address, port, if_index, af);
1224
if(ret < 0){
1225
exitcode = EXIT_FAILURE;
1226
} else {
2085
address = connect_to;
2086
2087
if(quit_now){
2088
goto end;
2089
}
2090
2091
while(not quit_now){
2092
ret = start_mandos_communication(address, port, if_index, af);
2093
if(quit_now or ret == 0){
2094
break;
2095
}
2096
if(debug){
2097
fprintf(stderr, "Mandos plugin mandos-client: "
2098
"Retrying in %d seconds\n", (int)retry_interval);
2099
}
2100
sleep((int)retry_interval);
2101
}
2102
2103
if (not quit_now){
1227
2104
exitcode = EXIT_SUCCESS;
1228
2105
}
1229
goto end;
1230
}
1231
2106
2107
goto end;
2108
}
2109
2110
if(quit_now){
2111
goto end;
2112
}
2113
1232
2114
{
1233
2115
AvahiServerConfig config;
1234
2116
/* Do not publish any local Zeroconf records */
1249
2131
1250
2132
/* Check if creating the Avahi server object succeeded */
1251
2133
if(mc.server == NULL){
1252
fprintf(stderr, "Failed to create Avahi server: %s\n",
2134
fprintf(stderr, "Mandos plugin mandos-client: "
2135
"Failed to create Avahi server: %s\n",
1253
2136
avahi_strerror(error));
1254
exitcode = EXIT_FAILURE;
2137
exitcode = EX_UNAVAILABLE;
2138
goto end;
2139
}
2140
2141
if(quit_now){
1255
2142
goto end;
1256
2143
}
1257
2144
1258
2145
/* Create the Avahi service browser */
1259
2146
sb = avahi_s_service_browser_new(mc.server, if_index,
1260
AVAHI_PROTO_INET6, "_mandos._tcp",
2147
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1261
2148
NULL, 0, browse_callback, NULL);
1262
2149
if(sb == NULL){
1263
fprintf(stderr, "Failed to create service browser: %s\n",
2150
fprintf(stderr, "Mandos plugin mandos-client: "
2151
"Failed to create service browser: %s\n",
1264
2152
avahi_strerror(avahi_server_errno(mc.server)));
1265
exitcode = EXIT_FAILURE;
2153
exitcode = EX_UNAVAILABLE;
2154
goto end;
2155
}
2156
2157
if(quit_now){
1266
2158
goto end;
1267
2159
}
1268
2160
1269
2161
/* Run the main loop */
1270
2162
1271
2163
if(debug){
1272
fprintf(stderr, "Starting Avahi loop search\n");
1273
}
1274
1275
avahi_simple_poll_loop(mc.simple_poll);
2164
fprintf(stderr, "Mandos plugin mandos-client: "
2165
"Starting Avahi loop search\n");
2166
}
2167
2168
ret = avahi_loop_with_timeout(mc.simple_poll,
2169
(int)(retry_interval * 1000));
2170
if(debug){
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"avahi_loop_with_timeout exited %s\n",
2173
(ret == 0) ? "successfully" : "with error");
2174
}
1276
2175
1277
2176
end:
1278
2177
1279
2178
if(debug){
1280
fprintf(stderr, "%s exiting\n", argv[0]);
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"%s exiting\n", argv[0]);
1281
2181
}
1282
2182
1283
2183
/* Cleanup things */
1299
2199
if(gpgme_initialized){
1300
2200
gpgme_release(mc.ctx);
1301
2201
}
1302
1303
/* Removes the temp directory used by GPGME */
2202
2203
/* Cleans up the circular linked list of Mandos servers the client
2204
has seen */
2205
if(mc.current_server != NULL){
2206
mc.current_server->prev->next = NULL;
2207
while(mc.current_server != NULL){
2208
server *next = mc.current_server->next;
2209
free(mc.current_server);
2210
mc.current_server = next;
2211
}
2212
}
2213
2214
/* XXX run network hooks "stop" here */
2215
2216
/* Take down the network interface */
2217
if(take_down_interface){
2218
/* Re-raise priviliges */
2219
errno = 0;
2220
ret = seteuid(0);
2221
if(ret == -1){
2222
perror_plus("seteuid");
2223
}
2224
if(geteuid() == 0){
2225
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2226
if(ret == -1){
2227
perror_plus("ioctl SIOCGIFFLAGS");
2228
} else if(network.ifr_flags & IFF_UP){
2229
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2230
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2231
if(ret == -1){
2232
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2233
}
2234
}
2235
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2236
if(ret == -1){
2237
perror_plus("close");
2238
}
2239
/* Lower privileges permanently */
2240
errno = 0;
2241
ret = setuid(uid);
2242
if(ret == -1){
2243
perror_plus("setuid");
2244
}
2245
}
2246
}
2247
2248
/* Removes the GPGME temp directory and all files inside */
1304
2249
if(tempdir_created){
1305
DIR *d;
1306
struct dirent *direntry;
1307
d = opendir(tempdir);
1308
if(d == NULL){
1309
if(errno != ENOENT){
1310
perror("opendir");
1311
}
1312
} else {
1313
while(true){
1314
direntry = readdir(d);
1315
if(direntry == NULL){
1316
break;
1317
}
1318
/* Skip "." and ".." */
1319
if(direntry->d_name[0] == '.'
1320
and (direntry->d_name[1] == '\0'
1321
or (direntry->d_name[1] == '.'
1322
and direntry->d_name[2] == '\0'))){
1323
continue;
1324
}
2250
struct dirent **direntries = NULL;
2251
struct dirent *direntry = NULL;
2252
int numentries = scandir(tempdir, &direntries, notdotentries,
2253
alphasort);
2254
if (numentries > 0){
2255
for(int i = 0; i < numentries; i++){
2256
direntry = direntries[i];
1325
2257
char *fullname = NULL;
1326
2258
ret = asprintf(&fullname, "%s/%s", tempdir,
1327
2259
direntry->d_name);
1328
2260
if(ret < 0){
1329
perror("asprintf");
2261
perror_plus("asprintf");
1330
2262
continue;
1331
2263
}
1332
2264
ret = remove(fullname);
1333
2265
if(ret == -1){
1334
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1335
strerror(errno));
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1336
2268
}
1337
2269
free(fullname);
1338
2270
}
1339
closedir(d);
2271
}
2272
2273
/* need to clean even if 0 because man page doesn't specify */
2274
free(direntries);
2275
if (numentries == -1){
2276
perror_plus("scandir");
1340
2277
}
1341
2278
ret = rmdir(tempdir);
1342
2279
if(ret == -1 and errno != ENOENT){
1343
perror("rmdir");
1344
}
2280
perror_plus("rmdir");
2281
}
2282
}
2283
2284
if(quit_now){
2285
sigemptyset(&old_sigterm_action.sa_mask);
2286
old_sigterm_action.sa_handler = SIG_DFL;
2287
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2288
&old_sigterm_action,
2289
NULL));
2290
if(ret == -1){
2291
perror_plus("sigaction");
2292
}
2293
do {
2294
ret = raise(signal_received);
2295
} while(ret != 0 and errno == EINTR);
2296
if(ret != 0){
2297
perror_plus("raise");
2298
abort();
2299
}
2300
TEMP_FAILURE_RETRY(pause());
1345
2301
}
1346
2302
1347
2303
return exitcode;
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Version: 2.0.2.dev0