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- Committer: teddy at bsnet
- Date: 2011-11-12 18:04:35 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-20111112180435-kdui7a6o7jfpgz9r
* plugins.d/mandos-client.c (SYNOPSIS, OPTIONS): Document
"--network-hook-dir"
option.
"--network-hook-dir"
option.
- 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() */
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
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,
196
AvahiIfIndex if_index,
197
int af){
198
int ret;
199
server *new_server = malloc(sizeof(server));
200
if(new_server == NULL){
201
perror_plus("malloc");
202
return -1;
203
}
204
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
208
if(new_server->ip == NULL){
209
perror_plus("strdup");
210
return -1;
211
}
212
/* Special case of first server */
213
if (mc.current_server == NULL){
214
new_server->next = new_server;
215
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
218
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
221
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
223
}
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
if(ret == -1){
226
perror_plus("clock_gettime");
227
return -1;
228
}
229
return 0;
230
}
231
162
232
/*
163
233
* Initialize GPGME.
164
234
*/
178
248
179
249
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
250
if(fd == -1){
181
perror("open");
251
perror_plus("open");
182
252
return false;
183
253
}
184
254
185
255
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
256
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
188
259
gpgme_strsource(rc), gpgme_strerror(rc));
189
260
return false;
190
261
}
191
262
192
263
rc = gpgme_op_import(mc.ctx, pgp_data);
193
264
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
195
267
gpgme_strsource(rc), gpgme_strerror(rc));
196
268
return false;
197
269
}
198
270
199
271
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
272
if(ret == -1){
201
perror("close");
273
perror_plus("close");
202
274
}
203
275
gpgme_data_release(pgp_data);
204
276
return true;
205
277
}
206
278
207
279
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
209
282
}
210
283
211
284
/* Init GPGME */
212
285
gpgme_check_version(NULL);
213
286
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
287
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
216
290
gpgme_strsource(rc), gpgme_strerror(rc));
217
291
return false;
218
292
}
219
293
220
/* Set GPGME home directory for the OpenPGP engine only */
294
/* Set GPGME home directory for the OpenPGP engine only */
221
295
rc = gpgme_get_engine_info(&engine_info);
222
296
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
224
299
gpgme_strsource(rc), gpgme_strerror(rc));
225
300
return false;
226
301
}
233
308
engine_info = engine_info->next;
234
309
}
235
310
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
237
313
return false;
238
314
}
239
315
240
316
/* Create new GPGME "context" */
241
317
rc = gpgme_new(&(mc.ctx));
242
318
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
245
322
return false;
246
323
}
247
324
266
343
ssize_t plaintext_length = 0;
267
344
268
345
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
270
348
}
271
349
272
350
/* Create new GPGME data buffer from memory cryptotext */
273
351
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
352
0);
275
353
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
277
356
gpgme_strsource(rc), gpgme_strerror(rc));
278
357
return -1;
279
358
}
281
360
/* Create new empty GPGME data buffer for the plaintext */
282
361
rc = gpgme_data_new(&dh_plain);
283
362
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
285
365
gpgme_strsource(rc), gpgme_strerror(rc));
286
366
gpgme_data_release(dh_crypto);
287
367
return -1;
291
371
data buffer */
292
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
373
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
295
376
gpgme_strsource(rc), gpgme_strerror(rc));
296
377
plaintext_length = -1;
297
378
if(debug){
298
379
gpgme_decrypt_result_t result;
299
380
result = gpgme_op_decrypt_result(mc.ctx);
300
381
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
302
384
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
304
387
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
306
390
result->wrong_key_usage);
307
391
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
309
394
}
310
395
gpgme_recipient_t recipient;
311
396
recipient = result->recipients;
312
397
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
314
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
317
405
recipient->status == GPG_ERR_NO_SECKEY
318
406
? "No" : "Yes");
319
407
recipient = recipient->next;
324
412
}
325
413
326
414
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
328
417
}
329
418
330
419
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
420
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
421
perror_plus("gpgme_data_seek");
333
422
plaintext_length = -1;
334
423
goto decrypt_end;
335
424
}
340
429
(size_t)plaintext_length,
341
430
plaintext_capacity);
342
431
if(plaintext_capacity == 0){
343
perror("incbuffer");
432
perror_plus("incbuffer");
344
433
plaintext_length = -1;
345
434
goto decrypt_end;
346
435
}
353
442
break;
354
443
}
355
444
if(ret < 0){
356
perror("gpgme_data_read");
445
perror_plus("gpgme_data_read");
357
446
plaintext_length = -1;
358
447
goto decrypt_end;
359
448
}
361
450
}
362
451
363
452
if(debug){
364
fprintf(stderr, "Decrypted password is: ");
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
365
455
for(ssize_t i = 0; i < plaintext_length; i++){
366
456
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
367
457
}
389
479
/* GnuTLS log function callback */
390
480
static void debuggnutls(__attribute__((unused)) int level,
391
481
const char* string){
392
fprintf(stderr, "GnuTLS: %s", string);
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
393
483
}
394
484
395
485
static int init_gnutls_global(const char *pubkeyfilename,
397
487
int ret;
398
488
399
489
if(debug){
400
fprintf(stderr, "Initializing GnuTLS\n");
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
401
492
}
402
493
403
494
ret = gnutls_global_init();
404
495
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
407
498
return -1;
408
499
}
409
500
416
507
}
417
508
418
509
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
420
511
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));
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
426
514
gnutls_global_deinit();
427
515
return -1;
428
516
}
429
517
430
518
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
432
521
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
522
seckeyfilename);
434
523
}
438
527
GNUTLS_OPENPGP_FMT_BASE64);
439
528
if(ret != GNUTLS_E_SUCCESS){
440
529
fprintf(stderr,
530
"Mandos plugin mandos-client: "
441
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
445
535
goto globalfail;
446
536
}
447
537
448
538
/* GnuTLS server initialization */
449
539
ret = gnutls_dh_params_init(&mc.dh_params);
450
540
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
452
543
" %s\n", safer_gnutls_strerror(ret));
453
544
goto globalfail;
454
545
}
455
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
547
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
458
550
safer_gnutls_strerror(ret));
459
551
goto globalfail;
460
552
}
474
566
static int init_gnutls_session(gnutls_session_t *session){
475
567
int ret;
476
568
/* GnuTLS session creation */
477
ret = gnutls_init(session, GNUTLS_SERVER);
569
do {
570
ret = gnutls_init(session, GNUTLS_SERVER);
571
if(quit_now){
572
return -1;
573
}
574
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
575
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
480
578
safer_gnutls_strerror(ret));
481
579
}
482
580
483
581
{
484
582
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
583
do {
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
if(quit_now){
586
gnutls_deinit(*session);
587
return -1;
588
}
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
590
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));
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
490
595
gnutls_deinit(*session);
491
596
return -1;
492
597
}
493
598
}
494
599
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
600
do {
601
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
602
mc.cred);
603
if(quit_now){
604
gnutls_deinit(*session);
605
return -1;
606
}
607
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
608
if(ret != GNUTLS_E_SUCCESS){
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
499
611
safer_gnutls_strerror(ret));
500
612
gnutls_deinit(*session);
501
613
return -1;
502
614
}
503
615
504
616
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
618
508
619
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
509
620
514
625
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
626
__attribute__((unused)) const char *txt){}
516
627
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
520
628
/* Called when a Mandos server is found */
521
629
static int start_mandos_communication(const char *ip, uint16_t port,
522
630
AvahiIfIndex if_index,
528
636
struct sockaddr_in6 in6;
529
637
} to;
530
638
char *buffer = NULL;
531
char *decrypted_buffer;
639
char *decrypted_buffer = NULL;
532
640
size_t buffer_length = 0;
533
641
size_t buffer_capacity = 0;
534
642
size_t written;
535
int retval = 0;
643
int retval = -1;
536
644
gnutls_session_t session;
537
645
int pf; /* Protocol family */
538
646
647
errno = 0;
648
539
649
if(quit_now){
650
errno = EINTR;
540
651
return -1;
541
652
}
542
653
548
659
pf = PF_INET;
549
660
break;
550
661
default:
551
fprintf(stderr, "Bad address family: %d\n", af);
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
664
errno = EINVAL;
552
665
return -1;
553
666
}
554
667
558
671
}
559
672
560
673
if(debug){
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
562
676
"\n", ip, port);
563
677
}
564
678
565
679
tcp_sd = socket(pf, SOCK_STREAM, 0);
566
680
if(tcp_sd < 0){
567
perror("socket");
568
retval = -1;
681
int e = errno;
682
perror_plus("socket");
683
errno = e;
569
684
goto mandos_end;
570
685
}
571
686
572
687
if(quit_now){
688
errno = EINTR;
573
689
goto mandos_end;
574
690
}
575
691
582
698
ret = inet_pton(af, ip, &to.in.sin_addr);
583
699
}
584
700
if(ret < 0 ){
585
perror("inet_pton");
586
retval = -1;
701
int e = errno;
702
perror_plus("inet_pton");
703
errno = e;
587
704
goto mandos_end;
588
705
}
589
706
if(ret == 0){
590
fprintf(stderr, "Bad address: %s\n", ip);
591
retval = -1;
707
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
710
errno = e;
592
711
goto mandos_end;
593
712
}
594
713
if(af == AF_INET6){
600
719
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
601
720
-Wunreachable-code*/
602
721
if(if_index == AVAHI_IF_UNSPEC){
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
604
724
" without a network interface\n");
605
retval = -1;
725
errno = EINVAL;
606
726
goto mandos_end;
607
727
}
608
728
/* Set the network interface number as scope */
615
735
}
616
736
617
737
if(quit_now){
738
errno = EINTR;
618
739
goto mandos_end;
619
740
}
620
741
622
743
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
623
744
char interface[IF_NAMESIZE];
624
745
if(if_indextoname((unsigned int)if_index, interface) == NULL){
625
perror("if_indextoname");
746
perror_plus("if_indextoname");
626
747
} else {
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
628
750
ip, interface, port);
629
751
}
630
752
} else {
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
633
755
}
634
756
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
635
757
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
642
764
sizeof(addrstr));
643
765
}
644
766
if(pcret == NULL){
645
perror("inet_ntop");
767
perror_plus("inet_ntop");
646
768
} else {
647
769
if(strcmp(addrstr, ip) != 0){
648
fprintf(stderr, "Canonical address form: %s\n", addrstr);
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
649
772
}
650
773
}
651
774
}
652
775
653
776
if(quit_now){
777
errno = EINTR;
654
778
goto mandos_end;
655
779
}
656
780
660
784
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
661
785
}
662
786
if(ret < 0){
663
perror("connect");
664
retval = -1;
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
int e = errno;
789
perror_plus("connect");
790
errno = e;
791
}
665
792
goto mandos_end;
666
793
}
667
794
668
795
if(quit_now){
796
errno = EINTR;
669
797
goto mandos_end;
670
798
}
671
799
676
804
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
677
805
out_size - written));
678
806
if(ret == -1){
679
perror("write");
680
retval = -1;
807
int e = errno;
808
perror_plus("write");
809
errno = e;
681
810
goto mandos_end;
682
811
}
683
812
written += (size_t)ret;
693
822
}
694
823
695
824
if(quit_now){
825
errno = EINTR;
696
826
goto mandos_end;
697
827
}
698
828
}
699
829
700
830
if(debug){
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
702
833
}
703
834
704
835
if(quit_now){
836
errno = EINTR;
705
837
goto mandos_end;
706
838
}
707
839
840
/* Spurious warning from -Wint-to-pointer-cast */
708
841
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
709
842
710
843
if(quit_now){
844
errno = EINTR;
711
845
goto mandos_end;
712
846
}
713
847
714
848
do {
715
849
ret = gnutls_handshake(session);
716
850
if(quit_now){
851
errno = EINTR;
717
852
goto mandos_end;
718
853
}
719
854
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
855
721
856
if(ret != GNUTLS_E_SUCCESS){
722
857
if(debug){
723
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
724
860
gnutls_perror(ret);
725
861
}
726
retval = -1;
862
errno = EPROTO;
727
863
goto mandos_end;
728
864
}
729
865
730
866
/* Read OpenPGP packet that contains the wanted password */
731
867
732
868
if(debug){
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
734
ip);
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
735
871
}
736
872
737
873
while(true){
738
874
739
875
if(quit_now){
876
errno = EINTR;
740
877
goto mandos_end;
741
878
}
742
879
743
880
buffer_capacity = incbuffer(&buffer, buffer_length,
744
881
buffer_capacity);
745
882
if(buffer_capacity == 0){
746
perror("incbuffer");
747
retval = -1;
883
int e = errno;
884
perror_plus("incbuffer");
885
errno = e;
748
886
goto mandos_end;
749
887
}
750
888
751
889
if(quit_now){
890
errno = EINTR;
752
891
goto mandos_end;
753
892
}
754
893
767
906
ret = gnutls_handshake(session);
768
907
769
908
if(quit_now){
909
errno = EINTR;
770
910
goto mandos_end;
771
911
}
772
912
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
773
913
if(ret < 0){
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
775
916
gnutls_perror(ret);
776
retval = -1;
917
errno = EPROTO;
777
918
goto mandos_end;
778
919
}
779
920
break;
780
921
default:
781
fprintf(stderr, "Unknown error while reading data from"
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
782
924
" encrypted session with Mandos server\n");
783
retval = -1;
784
925
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
errno = EIO;
785
927
goto mandos_end;
786
928
}
787
929
} else {
790
932
}
791
933
792
934
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
}
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
937
}
938
939
if(quit_now){
940
errno = EINTR;
941
goto mandos_end;
942
}
943
944
do {
945
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
805
951
806
952
if(buffer_length > 0){
807
953
ssize_t decrypted_buffer_size;
813
959
written = 0;
814
960
while(written < (size_t) decrypted_buffer_size){
815
961
if(quit_now){
962
errno = EINTR;
816
963
goto mandos_end;
817
964
}
818
965
820
967
(size_t)decrypted_buffer_size - written,
821
968
stdout);
822
969
if(ret == 0 and ferror(stdout)){
970
int e = errno;
823
971
if(debug){
824
fprintf(stderr, "Error writing encrypted data: %s\n",
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
825
974
strerror(errno));
826
975
}
827
retval = -1;
828
break;
976
errno = e;
977
goto mandos_end;
829
978
}
830
979
written += (size_t)ret;
831
980
}
832
free(decrypted_buffer);
833
} else {
834
retval = -1;
981
retval = 0;
835
982
}
836
} else {
837
retval = -1;
838
983
}
839
984
840
985
/* Shutdown procedure */
841
986
842
987
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;
988
{
989
int e = errno;
990
free(decrypted_buffer);
991
free(buffer);
992
if(tcp_sd >= 0){
993
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
994
}
995
if(ret == -1){
996
if(e == 0){
997
e = errno;
998
}
999
perror_plus("close");
1000
}
1001
gnutls_deinit(session);
1002
errno = e;
1003
if(quit_now){
1004
errno = EINTR;
1005
retval = -1;
1006
}
853
1007
}
854
1008
return retval;
855
1009
}
880
1034
switch(event){
881
1035
default:
882
1036
case AVAHI_RESOLVER_FAILURE:
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
884
1039
" of type '%s' in domain '%s': %s\n", name, type, domain,
885
1040
avahi_strerror(avahi_server_errno(mc.server)));
886
1041
break;
890
1045
char ip[AVAHI_ADDRESS_STR_MAX];
891
1046
avahi_address_snprint(ip, sizeof(ip), address);
892
1047
if(debug){
893
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
894
1050
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
1051
ip, (intmax_t)interface, port);
896
1052
}
898
1054
avahi_proto_to_af(proto));
899
1055
if(ret == 0){
900
1056
avahi_simple_poll_quit(mc.simple_poll);
1057
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
901
1060
}
902
1061
}
903
1062
}
927
1086
default:
928
1087
case AVAHI_BROWSER_FAILURE:
929
1088
930
fprintf(stderr, "(Avahi browser) %s\n",
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
931
1091
avahi_strerror(avahi_server_errno(mc.server)));
932
1092
avahi_simple_poll_quit(mc.simple_poll);
933
1093
return;
941
1101
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
942
1102
name, type, domain, protocol, 0,
943
1103
resolve_callback, NULL) == NULL)
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
945
1106
name, avahi_strerror(avahi_server_errno(mc.server)));
946
1107
break;
947
1108
951
1112
case AVAHI_BROWSER_ALL_FOR_NOW:
952
1113
case AVAHI_BROWSER_CACHE_EXHAUSTED:
953
1114
if(debug){
954
fprintf(stderr, "No Mandos server found, still searching...\n");
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
955
1117
}
956
1118
break;
957
1119
}
958
1120
}
959
1121
960
/* stop main loop after sigterm has been called */
1122
/* Signal handler that stops main loop after SIGTERM */
961
1123
static void handle_sigterm(int sig){
962
1124
if(quit_now){
963
1125
return;
965
1127
quit_now = 1;
966
1128
signal_received = sig;
967
1129
int old_errno = errno;
1130
/* set main loop to exit */
968
1131
if(mc.simple_poll != NULL){
969
1132
avahi_simple_poll_quit(mc.simple_poll);
970
1133
}
971
1134
errno = old_errno;
972
1135
}
973
1136
1137
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
int ret;
1139
1140
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
if(s < 0){
1142
perror_plus("socket");
1143
return false;
1144
}
1145
strcpy(ifr->ifr_name, ifname);
1146
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
if(ret == -1){
1148
if(debug){
1149
perror_plus("ioctl SIOCGIFFLAGS");
1150
}
1151
return false;
1152
}
1153
return true;
1154
}
1155
1156
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1158
/* Reject the loopback device */
1159
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1163
}
1164
return false;
1165
}
1166
/* Accept point-to-point devices only if connect_to is specified */
1167
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1171
}
1172
return true;
1173
}
1174
/* Otherwise, reject non-broadcast-capable devices */
1175
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1179
}
1180
return false;
1181
}
1182
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
if(ifr->ifr_flags & IFF_NOARP){
1184
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1187
}
1188
return false;
1189
}
1190
1191
/* Accept this device */
1192
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1195
}
1196
return true;
1197
}
1198
1199
/*
1200
* This function determines if a directory entry in /sys/class/net
1201
* corresponds to an acceptable network device.
1202
* (This function is passed to scandir(3) as a filter function.)
1203
*/
1204
int good_interface(const struct dirent *if_entry){
1205
if(if_entry->d_name[0] == '.'){
1206
return 0;
1207
}
1208
1209
struct ifreq ifr;
1210
if(not get_flags(if_entry->d_name, &ifr)){
1211
if(debug){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
if(not good_flags(if_entry->d_name, &ifr)){
1220
return 0;
1221
}
1222
return 1;
1223
}
1224
1225
/*
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1229
*/
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1232
return 0;
1233
}
1234
1235
struct ifreq ifr;
1236
if(not get_flags(if_entry->d_name, &ifr)){
1237
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1247
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1251
}
1252
return 0;
1253
}
1254
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1261
}
1262
return 0;
1263
}
1264
1265
if(not good_flags(if_entry->d_name, &ifr)){
1266
return 0;
1267
}
1268
return 1;
1269
}
1270
1271
int notdotentries(const struct dirent *direntry){
1272
/* Skip "." and ".." */
1273
if(direntry->d_name[0] == '.'
1274
and (direntry->d_name[1] == '\0'
1275
or (direntry->d_name[1] == '.'
1276
and direntry->d_name[2] == '\0'))){
1277
return 0;
1278
}
1279
return 1;
1280
}
1281
1282
/* Is this directory entry a runnable program? */
1283
int runnable_hook(const struct dirent *direntry){
1284
int ret;
1285
struct stat st;
1286
1287
if((direntry->d_name)[0] == '\0'){
1288
/* Empty name? */
1289
return 0;
1290
}
1291
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1307
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
1311
if(ret < 0){
1312
perror_plus("asprintf");
1313
return 0;
1314
}
1315
1316
ret = stat(fullname, &st);
1317
if(ret == -1){
1318
if(debug){
1319
perror_plus("Could not stat plugin");
1320
}
1321
return 0;
1322
}
1323
if(not (S_ISREG(st.st_mode))){
1324
/* Not a regular file */
1325
return 0;
1326
}
1327
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
/* Not executable */
1329
return 0;
1330
}
1331
return 1;
1332
}
1333
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1335
int ret;
1336
struct timespec now;
1337
struct timespec waited_time;
1338
intmax_t block_time;
1339
1340
while(true){
1341
if(mc.current_server == NULL){
1342
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1345
}
1346
ret = avahi_simple_poll_iterate(s, -1);
1347
} else {
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1352
}
1353
/* the current time */
1354
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1355
if(ret == -1){
1356
perror_plus("clock_gettime");
1357
return -1;
1358
}
1359
/* Calculating in ms how long time between now and server
1360
who we visted longest time ago. Now - last seen. */
1361
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1363
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1365
/* total time is 10s/10,000ms.
1366
Converting to s from ms by dividing by 1,000,
1367
and ns to ms by dividing by 1,000,000. */
1368
block_time = ((retry_interval
1369
- ((intmax_t)waited_time.tv_sec * 1000))
1370
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1375
}
1376
1377
if(block_time <= 0){
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1382
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1384
return 0;
1385
}
1386
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1388
if(ret == -1){
1389
perror_plus("clock_gettime");
1390
return -1;
1391
}
1392
mc.current_server = mc.current_server->next;
1393
block_time = 0; /* Call avahi to find new Mandos
1394
servers, but don't block */
1395
}
1396
1397
ret = avahi_simple_poll_iterate(s, (int)block_time);
1398
}
1399
if(ret != 0){
1400
if (ret > 0 or errno != EINTR){
1401
return (ret != 1) ? ret : 0;
1402
}
1403
}
1404
}
1405
}
1406
974
1407
int main(int argc, char *argv[]){
975
1408
AvahiSServiceBrowser *sb = NULL;
976
1409
int error;
978
1411
intmax_t tmpmax;
979
1412
char *tmp;
980
1413
int exitcode = EXIT_SUCCESS;
981
const char *interface = "eth0";
1414
const char *interface = "";
982
1415
struct ifreq network;
983
1416
int sd = -1;
984
1417
bool take_down_interface = false;
985
1418
uid_t uid;
986
1419
gid_t gid;
987
char *connect_to = NULL;
988
1420
char tempdir[] = "/tmp/mandosXXXXXX";
989
1421
bool tempdir_created = false;
990
1422
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
994
1426
bool gnutls_initialized = false;
995
1427
bool gpgme_initialized = false;
996
1428
float delay = 2.5f;
1429
double retry_interval = 10; /* 10s between trying a server and
1430
retrying the same server again */
997
1431
998
struct sigaction old_sigterm_action;
1432
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
999
1433
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1000
1434
1435
uid = getuid();
1436
gid = getgid();
1437
1438
/* Lower any group privileges we might have, just to be safe */
1439
errno = 0;
1440
ret = setgid(gid);
1441
if(ret == -1){
1442
perror_plus("setgid");
1443
}
1444
1445
/* Lower user privileges (temporarily) */
1446
errno = 0;
1447
ret = seteuid(uid);
1448
if(ret == -1){
1449
perror_plus("seteuid");
1450
}
1451
1452
if(quit_now){
1453
goto end;
1454
}
1455
1001
1456
{
1002
1457
struct argp_option options[] = {
1003
1458
{ .name = "debug", .key = 128,
1032
1487
.arg = "SECONDS",
1033
1488
.doc = "Maximum delay to wait for interface startup",
1034
1489
.group = 2 },
1490
{ .name = "retry", .key = 132,
1491
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
1493
.group = 2 },
1494
{ .name = "network-hook-dir", .key = 133,
1495
.arg = "DIR",
1496
.doc = "Directory where network hooks are located",
1497
.group = 2 },
1498
/*
1499
* These reproduce what we would get without ARGP_NO_HELP
1500
*/
1501
{ .name = "help", .key = '?',
1502
.doc = "Give this help list", .group = -1 },
1503
{ .name = "usage", .key = -3,
1504
.doc = "Give a short usage message", .group = -1 },
1505
{ .name = "version", .key = 'V',
1506
.doc = "Print program version", .group = -1 },
1035
1507
{ .name = NULL }
1036
1508
};
1037
1509
1038
1510
error_t parse_opt(int key, char *arg,
1039
1511
struct argp_state *state){
1512
errno = 0;
1040
1513
switch(key){
1041
1514
case 128: /* --debug */
1042
1515
debug = true;
1058
1531
tmpmax = strtoimax(arg, &tmp, 10);
1059
1532
if(errno != 0 or tmp == arg or *tmp != '\0'
1060
1533
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
1534
argp_error(state, "Bad number of DH bits");
1063
1535
}
1064
1536
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1065
1537
break;
1070
1542
errno = 0;
1071
1543
delay = strtof(arg, &tmp);
1072
1544
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:
1545
argp_error(state, "Bad delay");
1546
}
1547
case 132: /* --retry */
1548
errno = 0;
1549
retry_interval = strtod(arg, &tmp);
1550
if(errno != 0 or tmp == arg or *tmp != '\0'
1551
or (retry_interval * 1000) > INT_MAX
1552
or retry_interval < 0){
1553
argp_error(state, "Bad retry interval");
1554
}
1555
break;
1556
case 133: /* --network-hook-dir */
1557
hookdir = arg;
1558
break;
1559
/*
1560
* These reproduce what we would get without ARGP_NO_HELP
1561
*/
1562
case '?': /* --help */
1563
argp_state_help(state, state->out_stream,
1564
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1565
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1566
case -3: /* --usage */
1567
argp_state_help(state, state->out_stream,
1568
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
1572
exit(argp_err_exit_status);
1080
1573
break;
1081
1574
default:
1082
1575
return ARGP_ERR_UNKNOWN;
1083
1576
}
1084
return 0;
1577
return errno;
1085
1578
}
1086
1579
1087
1580
struct argp argp = { .options = options, .parser = parse_opt,
1088
1581
.args_doc = "",
1089
1582
.doc = "Mandos client -- Get and decrypt"
1090
1583
" 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;
1584
ret = argp_parse(&argp, argc, argv,
1585
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1586
switch(ret){
1587
case 0:
1588
break;
1589
case ENOMEM:
1590
default:
1591
errno = ret;
1592
perror_plus("argp_parse");
1593
exitcode = EX_OSERR;
1594
goto end;
1595
case EINVAL:
1596
exitcode = EX_USAGE;
1597
goto end;
1598
}
1599
}
1600
1601
{
1602
/* Work around Debian bug #633582:
1603
<http://bugs.debian.org/633582> */
1604
struct stat st;
1605
1606
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1658
}
1659
}
1660
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
1669
} else {
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
1748
goto end;
1749
}
1750
}
1751
close(devnull);
1096
1752
}
1097
1753
}
1098
1754
1100
1756
avahi_set_log_function(empty_log);
1101
1757
}
1102
1758
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1763
alphasort);
1764
if(ret == 0){
1765
/* No up interfaces, look for any good interfaces */
1766
free(direntries);
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1768
alphasort);
1769
}
1770
if(ret >= 1){
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1773
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1776
}
1777
if(interface == NULL){
1778
perror_plus("malloc");
1779
free(direntries);
1780
exitcode = EXIT_FAILURE;
1781
goto end;
1782
}
1783
free(direntries);
1784
} else {
1785
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1788
exitcode = EXIT_FAILURE;
1789
goto end;
1790
}
1791
}
1792
1103
1793
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1104
1794
from the signal handler */
1105
1795
/* Initialize the pseudo-RNG for Avahi */
1106
1796
srand((unsigned int) time(NULL));
1107
1797
mc.simple_poll = avahi_simple_poll_new();
1108
1798
if(mc.simple_poll == NULL){
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
1801
exitcode = EX_UNAVAILABLE;
1111
1802
goto end;
1112
1803
}
1113
1804
1114
1805
sigemptyset(&sigterm_action.sa_mask);
1115
1806
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1116
1807
if(ret == -1){
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
1808
perror_plus("sigaddset");
1809
exitcode = EX_OSERR;
1119
1810
goto end;
1120
1811
}
1121
1812
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1122
1813
if(ret == -1){
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
1814
perror_plus("sigaddset");
1815
exitcode = EX_OSERR;
1125
1816
goto end;
1126
1817
}
1127
1818
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1128
1819
if(ret == -1){
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
1820
perror_plus("sigaddset");
1821
exitcode = EX_OSERR;
1131
1822
goto end;
1132
1823
}
1133
1824
/* Need to check if the handler is SIG_IGN before handling:
1136
1827
*/
1137
1828
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1138
1829
if(ret == -1){
1139
perror("sigaction");
1140
return EXIT_FAILURE;
1830
perror_plus("sigaction");
1831
return EX_OSERR;
1141
1832
}
1142
1833
if(old_sigterm_action.sa_handler != SIG_IGN){
1143
1834
ret = sigaction(SIGINT, &sigterm_action, NULL);
1144
1835
if(ret == -1){
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
1836
perror_plus("sigaction");
1837
exitcode = EX_OSERR;
1147
1838
goto end;
1148
1839
}
1149
1840
}
1150
1841
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1151
1842
if(ret == -1){
1152
perror("sigaction");
1153
return EXIT_FAILURE;
1843
perror_plus("sigaction");
1844
return EX_OSERR;
1154
1845
}
1155
1846
if(old_sigterm_action.sa_handler != SIG_IGN){
1156
1847
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1157
1848
if(ret == -1){
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
1849
perror_plus("sigaction");
1850
exitcode = EX_OSERR;
1160
1851
goto end;
1161
1852
}
1162
1853
}
1163
1854
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1164
1855
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1856
perror_plus("sigaction");
1857
return EX_OSERR;
1167
1858
}
1168
1859
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
1860
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1170
1861
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1862
perror_plus("sigaction");
1863
exitcode = EX_OSERR;
1173
1864
goto end;
1174
1865
}
1175
1866
}
1176
1867
1177
1868
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
1869
if(strcmp(interface, "none") != 0){
1179
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
1180
1871
if(if_index == 0){
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1183
1875
goto end;
1184
1876
}
1185
1877
1187
1879
goto end;
1188
1880
}
1189
1881
1882
/* Re-raise priviliges */
1883
errno = 0;
1884
ret = seteuid(0);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
1190
1889
#ifdef __linux__
1191
1890
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1891
messages about the network interface to mess up the prompt */
1193
1892
ret = klogctl(8, NULL, 5);
1194
1893
bool restore_loglevel = true;
1195
1894
if(ret == -1){
1196
1895
restore_loglevel = false;
1197
perror("klogctl");
1896
perror_plus("klogctl");
1198
1897
}
1199
1898
#endif /* __linux__ */
1200
1899
1201
1900
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
1901
if(sd < 0){
1203
perror("socket");
1204
exitcode = EXIT_FAILURE;
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1205
1904
#ifdef __linux__
1206
1905
if(restore_loglevel){
1207
1906
ret = klogctl(7, NULL, 0);
1208
1907
if(ret == -1){
1209
perror("klogctl");
1908
perror_plus("klogctl");
1210
1909
}
1211
1910
}
1212
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1913
errno = 0;
1914
ret = seteuid(uid);
1915
if(ret == -1){
1916
perror_plus("seteuid");
1917
}
1213
1918
goto end;
1214
1919
}
1215
1920
strcpy(network.ifr_name, interface);
1216
1921
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1217
1922
if(ret == -1){
1218
perror("ioctl SIOCGIFFLAGS");
1923
perror_plus("ioctl SIOCGIFFLAGS");
1219
1924
#ifdef __linux__
1220
1925
if(restore_loglevel){
1221
1926
ret = klogctl(7, NULL, 0);
1222
1927
if(ret == -1){
1223
perror("klogctl");
1928
perror_plus("klogctl");
1224
1929
}
1225
1930
}
1226
1931
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1934
errno = 0;
1935
ret = seteuid(uid);
1936
if(ret == -1){
1937
perror_plus("seteuid");
1938
}
1228
1939
goto end;
1229
1940
}
1230
1941
if((network.ifr_flags & IFF_UP) == 0){
1233
1944
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
1945
if(ret == -1){
1235
1946
take_down_interface = false;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1238
1949
#ifdef __linux__
1239
1950
if(restore_loglevel){
1240
1951
ret = klogctl(7, NULL, 0);
1241
1952
if(ret == -1){
1242
perror("klogctl");
1953
perror_plus("klogctl");
1243
1954
}
1244
1955
}
1245
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1958
errno = 0;
1959
ret = seteuid(uid);
1960
if(ret == -1){
1961
perror_plus("seteuid");
1962
}
1246
1963
goto end;
1247
1964
}
1248
1965
}
1249
/* sleep checking until interface is running */
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1250
1968
for(int i=0; i < delay * 4; i++){
1251
1969
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1252
1970
if(ret == -1){
1253
perror("ioctl SIOCGIFFLAGS");
1971
perror_plus("ioctl SIOCGIFFLAGS");
1254
1972
} else if(network.ifr_flags & IFF_RUNNING){
1255
1973
break;
1256
1974
}
1257
1975
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
1976
ret = nanosleep(&sleeptime, NULL);
1259
1977
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1978
perror_plus("nanosleep");
1261
1979
}
1262
1980
}
1263
1981
if(not take_down_interface){
1264
1982
/* We won't need the socket anymore */
1265
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
1984
if(ret == -1){
1267
perror("close");
1985
perror_plus("close");
1268
1986
}
1269
1987
}
1270
1988
#ifdef __linux__
1272
1990
/* Restores kernel loglevel to default */
1273
1991
ret = klogctl(7, NULL, 0);
1274
1992
if(ret == -1){
1275
perror("klogctl");
1993
perror_plus("klogctl");
1276
1994
}
1277
1995
}
1278
1996
#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");
1997
/* Lower privileges */
1998
errno = 0;
1999
if(take_down_interface){
2000
/* Lower privileges */
2001
ret = seteuid(uid);
2002
if(ret == -1){
2003
perror_plus("seteuid");
2004
}
2005
} else {
2006
/* Lower privileges permanently */
2007
ret = setuid(uid);
2008
if(ret == -1){
2009
perror_plus("setuid");
2010
}
2011
}
1297
2012
}
1298
2013
1299
2014
if(quit_now){
1302
2017
1303
2018
ret = init_gnutls_global(pubkey, seckey);
1304
2019
if(ret == -1){
1305
fprintf(stderr, "init_gnutls_global failed\n");
1306
exitcode = EXIT_FAILURE;
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2022
exitcode = EX_UNAVAILABLE;
1307
2023
goto end;
1308
2024
} else {
1309
2025
gnutls_initialized = true;
1313
2029
goto end;
1314
2030
}
1315
2031
2032
if(mkdtemp(tempdir) == NULL){
2033
perror_plus("mkdtemp");
2034
goto end;
2035
}
1316
2036
tempdir_created = true;
1317
if(mkdtemp(tempdir) == NULL){
1318
tempdir_created = false;
1319
perror("mkdtemp");
1320
goto end;
1321
}
1322
2037
1323
2038
if(quit_now){
1324
2039
goto end;
1325
2040
}
1326
2041
1327
2042
if(not init_gpgme(pubkey, seckey, tempdir)){
1328
fprintf(stderr, "init_gpgme failed\n");
1329
exitcode = EXIT_FAILURE;
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2045
exitcode = EX_UNAVAILABLE;
1330
2046
goto end;
1331
2047
} else {
1332
2048
gpgme_initialized = true;
1341
2057
/* (Mainly meant for debugging) */
1342
2058
char *address = strrchr(connect_to, ':');
1343
2059
if(address == NULL){
1344
fprintf(stderr, "No colon in address\n");
1345
exitcode = EXIT_FAILURE;
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2062
exitcode = EX_USAGE;
1346
2063
goto end;
1347
2064
}
1348
2065
1355
2072
tmpmax = strtoimax(address+1, &tmp, 10);
1356
2073
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1357
2074
or tmpmax != (uint16_t)tmpmax){
1358
fprintf(stderr, "Bad port number\n");
1359
exitcode = EXIT_FAILURE;
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
2077
exitcode = EX_USAGE;
1360
2078
goto end;
1361
2079
}
1362
2080
1366
2084
1367
2085
port = (uint16_t)tmpmax;
1368
2086
*address = '\0';
1369
address = connect_to;
1370
2087
/* Colon in address indicates IPv6 */
1371
2088
int af;
1372
if(strchr(address, ':') != NULL){
2089
if(strchr(connect_to, ':') != NULL){
1373
2090
af = AF_INET6;
2091
/* Accept [] around IPv6 address - see RFC 5952 */
2092
if(connect_to[0] == '[' and address[-1] == ']')
2093
{
2094
connect_to++;
2095
address[-1] = '\0';
2096
}
1374
2097
} else {
1375
2098
af = AF_INET;
1376
2099
}
2100
address = connect_to;
1377
2101
1378
2102
if(quit_now){
1379
2103
goto end;
1380
2104
}
1381
2105
1382
ret = start_mandos_communication(address, port, if_index, af);
1383
if(ret < 0){
1384
exitcode = EXIT_FAILURE;
1385
} else {
2106
while(not quit_now){
2107
ret = start_mandos_communication(address, port, if_index, af);
2108
if(quit_now or ret == 0){
2109
break;
2110
}
2111
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2114
}
2115
sleep((int)retry_interval);
2116
}
2117
2118
if (not quit_now){
1386
2119
exitcode = EXIT_SUCCESS;
1387
2120
}
2121
1388
2122
goto end;
1389
2123
}
1390
2124
1412
2146
1413
2147
/* Check if creating the Avahi server object succeeded */
1414
2148
if(mc.server == NULL){
1415
fprintf(stderr, "Failed to create Avahi server: %s\n",
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
1416
2151
avahi_strerror(error));
1417
exitcode = EXIT_FAILURE;
2152
exitcode = EX_UNAVAILABLE;
1418
2153
goto end;
1419
2154
}
1420
2155
1427
2162
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1428
2163
NULL, 0, browse_callback, NULL);
1429
2164
if(sb == NULL){
1430
fprintf(stderr, "Failed to create service browser: %s\n",
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
1431
2167
avahi_strerror(avahi_server_errno(mc.server)));
1432
exitcode = EXIT_FAILURE;
2168
exitcode = EX_UNAVAILABLE;
1433
2169
goto end;
1434
2170
}
1435
2171
1440
2176
/* Run the main loop */
1441
2177
1442
2178
if(debug){
1443
fprintf(stderr, "Starting Avahi loop search\n");
1444
}
1445
1446
avahi_simple_poll_loop(mc.simple_poll);
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2181
}
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2185
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2189
}
1447
2190
1448
2191
end:
1449
2192
1450
2193
if(debug){
1451
fprintf(stderr, "%s exiting\n", argv[0]);
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
1452
2196
}
1453
2197
1454
2198
/* Cleanup things */
1470
2214
if(gpgme_initialized){
1471
2215
gpgme_release(mc.ctx);
1472
2216
}
2217
2218
/* Cleans up the circular linked list of Mandos servers the client
2219
has seen */
2220
if(mc.current_server != NULL){
2221
mc.current_server->prev->next = NULL;
2222
while(mc.current_server != NULL){
2223
server *next = mc.current_server->next;
2224
free(mc.current_server);
2225
mc.current_server = next;
2226
}
2227
}
2228
2229
/* XXX run network hooks "stop" here */
1473
2230
1474
2231
/* Take down the network interface */
1475
2232
if(take_down_interface){
1476
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2233
/* Re-raise priviliges */
2234
errno = 0;
2235
ret = seteuid(0);
1477
2236
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
}
2237
perror_plus("seteuid");
1485
2238
}
1486
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1487
if(ret == -1){
1488
perror("close");
2239
if(geteuid() == 0){
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2248
}
2249
}
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
if(ret == -1){
2252
perror_plus("close");
2253
}
2254
/* Lower privileges permanently */
2255
errno = 0;
2256
ret = setuid(uid);
2257
if(ret == -1){
2258
perror_plus("setuid");
2259
}
1489
2260
}
1490
2261
}
1491
2262
1492
/* Removes the temp directory used by GPGME */
2263
/* Removes the GPGME temp directory and all files inside */
1493
2264
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
}
2265
struct dirent **direntries = NULL;
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2268
alphasort);
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
direntry = direntries[i];
1514
2272
char *fullname = NULL;
1515
2273
ret = asprintf(&fullname, "%s/%s", tempdir,
1516
2274
direntry->d_name);
1517
2275
if(ret < 0){
1518
perror("asprintf");
2276
perror_plus("asprintf");
1519
2277
continue;
1520
2278
}
1521
2279
ret = remove(fullname);
1522
2280
if(ret == -1){
1523
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1524
strerror(errno));
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1525
2283
}
1526
2284
free(fullname);
1527
2285
}
1528
closedir(d);
2286
}
2287
2288
/* need to clean even if 0 because man page doesn't specify */
2289
free(direntries);
2290
if (numentries == -1){
2291
perror_plus("scandir");
1529
2292
}
1530
2293
ret = rmdir(tempdir);
1531
2294
if(ret == -1 and errno != ENOENT){
1532
perror("rmdir");
2295
perror_plus("rmdir");
1533
2296
}
1534
2297
}
1535
2298
1536
2299
if(quit_now){
1537
2300
sigemptyset(&old_sigterm_action.sa_mask);
1538
2301
old_sigterm_action.sa_handler = SIG_DFL;
1539
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2302
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2303
&old_sigterm_action,
2304
NULL));
1540
2305
if(ret == -1){
1541
perror("sigaction");
1542
}
1543
raise(signal_received);
2306
perror_plus("sigaction");
2307
}
2308
do {
2309
ret = raise(signal_received);
2310
} while(ret != 0 and errno == EINTR);
2311
if(ret != 0){
2312
perror_plus("raise");
2313
abort();
2314
}
2315
TEMP_FAILURE_RETRY(pause());
1544
2316
}
1545
2317
1546
2318
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0