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237.2.141
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-09-19 19:18:49 UTC
- mto: (24.1.142 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20090919191849-mg04fr6wyll47zjf
* mandos (MandosServer): Fixed doc string.
* plugin-runner.c (main): Note warnings from "-Wconversion".
* plugin-runner.c (main): Note warnings from "-Wconversion".
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), 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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
75
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
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() */
90
85
91
86
#ifdef __linux__
92
87
#include <sys/klog.h> /* klogctl() */
110
105
init_gnutls_session(),
111
106
GNUTLS_* */
112
107
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
115
110
116
111
/* GPGME */
117
112
#include <gpgme.h> /* All GPGME types, constants and
125
120
#define PATHDIR "/conf/conf.d/mandos"
126
121
#define SECKEY "seckey.txt"
127
122
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
123
130
124
bool debug = false;
131
125
static const char mandos_protocol_version[] = "1";
132
126
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
128
149
129
/* Used for passing in values through the Avahi callback functions */
150
130
typedef struct {
155
135
gnutls_dh_params_t dh_params;
156
136
const char *priority;
157
137
gpgme_ctx_t ctx;
158
server *current_server;
159
138
} mandos_context;
160
139
161
140
/* global context so signal handler can reach it*/
162
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
142
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
166
144
167
145
sig_atomic_t quit_now = 0;
168
146
int signal_received = 0;
169
147
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
177
int fprintf_plus(FILE *stream, const char *format, ...){
178
va_list ap;
179
va_start (ap, format);
180
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
}
185
186
148
/*
187
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
188
150
* bytes. "buffer_capacity" is how much is currently allocated,
189
151
* "buffer_length" is how much is already used.
190
152
*/
191
153
size_t incbuffer(char **buffer, size_t buffer_length,
192
size_t buffer_capacity){
154
size_t buffer_capacity){
193
155
if(buffer_length + BUFFER_SIZE > buffer_capacity){
194
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
157
if(buffer == NULL){
200
162
return buffer_capacity;
201
163
}
202
164
203
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
206
int ret;
207
server *new_server = malloc(sizeof(server));
208
if(new_server == NULL){
209
perror_plus("malloc");
210
return -1;
211
}
212
*new_server = (server){ .ip = strdup(ip),
213
.port = port,
214
.if_index = if_index,
215
.af = af };
216
if(new_server->ip == NULL){
217
perror_plus("strdup");
218
return -1;
219
}
220
/* Special case of first server */
221
if (mc.current_server == NULL){
222
new_server->next = new_server;
223
new_server->prev = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
226
} else {
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
229
new_server->prev->next = new_server;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
238
}
239
240
165
/*
241
166
* Initialize GPGME.
242
167
*/
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
245
170
gpgme_error_t rc;
246
171
gpgme_engine_info_t engine_info;
247
172
256
181
257
182
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
258
183
if(fd == -1){
259
perror_plus("open");
184
perror("open");
260
185
return false;
261
186
}
262
187
263
188
rc = gpgme_data_new_from_fd(&pgp_data, fd);
264
189
if(rc != GPG_ERR_NO_ERROR){
265
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
267
192
return false;
268
193
}
269
194
270
195
rc = gpgme_op_import(mc.ctx, pgp_data);
271
196
if(rc != GPG_ERR_NO_ERROR){
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
274
199
return false;
275
200
}
276
201
277
202
ret = (int)TEMP_FAILURE_RETRY(close(fd));
278
203
if(ret == -1){
279
perror_plus("close");
204
perror("close");
280
205
}
281
206
gpgme_data_release(pgp_data);
282
207
return true;
283
208
}
284
209
285
210
if(debug){
286
fprintf_plus(stderr, "Initializing GPGME\n");
211
fprintf(stderr, "Initializing GPGME\n");
287
212
}
288
213
289
214
/* Init GPGME */
290
215
gpgme_check_version(NULL);
291
216
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
292
217
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
295
220
return false;
296
221
}
297
222
298
/* Set GPGME home directory for the OpenPGP engine only */
223
/* Set GPGME home directory for the OpenPGP engine only */
299
224
rc = gpgme_get_engine_info(&engine_info);
300
225
if(rc != GPG_ERR_NO_ERROR){
301
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
303
228
return false;
304
229
}
305
230
while(engine_info != NULL){
311
236
engine_info = engine_info->next;
312
237
}
313
238
if(engine_info == NULL){
314
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
315
tempdir);
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
316
240
return false;
317
241
}
318
242
319
243
/* Create new GPGME "context" */
320
244
rc = gpgme_new(&(mc.ctx));
321
245
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
324
gpgme_strerror(rc));
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
325
248
return false;
326
249
}
327
250
346
269
ssize_t plaintext_length = 0;
347
270
348
271
if(debug){
349
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
350
273
}
351
274
352
275
/* Create new GPGME data buffer from memory cryptotext */
353
276
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
354
277
0);
355
278
if(rc != GPG_ERR_NO_ERROR){
356
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
358
281
return -1;
359
282
}
360
283
361
284
/* Create new empty GPGME data buffer for the plaintext */
362
285
rc = gpgme_data_new(&dh_plain);
363
286
if(rc != GPG_ERR_NO_ERROR){
364
fprintf_plus(stderr, "Mandos plugin mandos-client: "
365
"bad gpgme_data_new: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
367
289
gpgme_data_release(dh_crypto);
368
290
return -1;
369
291
}
372
294
data buffer */
373
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
374
296
if(rc != GPG_ERR_NO_ERROR){
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
377
299
plaintext_length = -1;
378
300
if(debug){
379
301
gpgme_decrypt_result_t result;
380
302
result = gpgme_op_decrypt_result(mc.ctx);
381
303
if(result == NULL){
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
305
} else {
384
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
385
result->unsupported_algorithm);
386
fprintf_plus(stderr, "Wrong key usage: %u\n",
387
result->wrong_key_usage);
306
fprintf(stderr, "Unsupported algorithm: %s\n",
307
result->unsupported_algorithm);
308
fprintf(stderr, "Wrong key usage: %u\n",
309
result->wrong_key_usage);
388
310
if(result->file_name != NULL){
389
fprintf_plus(stderr, "File name: %s\n", result->file_name);
311
fprintf(stderr, "File name: %s\n", result->file_name);
390
312
}
391
313
gpgme_recipient_t recipient;
392
314
recipient = result->recipients;
393
315
while(recipient != NULL){
394
fprintf_plus(stderr, "Public key algorithm: %s\n",
395
gpgme_pubkey_algo_name
396
(recipient->pubkey_algo));
397
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
398
fprintf_plus(stderr, "Secret key available: %s\n",
399
recipient->status == GPG_ERR_NO_SECKEY
400
? "No" : "Yes");
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
401
322
recipient = recipient->next;
402
323
}
403
324
}
406
327
}
407
328
408
329
if(debug){
409
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
410
331
}
411
332
412
333
/* Seek back to the beginning of the GPGME plaintext data buffer */
413
334
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
414
perror_plus("gpgme_data_seek");
335
perror("gpgme_data_seek");
415
336
plaintext_length = -1;
416
337
goto decrypt_end;
417
338
}
419
340
*plaintext = NULL;
420
341
while(true){
421
342
plaintext_capacity = incbuffer(plaintext,
422
(size_t)plaintext_length,
423
plaintext_capacity);
343
(size_t)plaintext_length,
344
plaintext_capacity);
424
345
if(plaintext_capacity == 0){
425
perror_plus("incbuffer");
426
plaintext_length = -1;
427
goto decrypt_end;
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
428
349
}
429
350
430
351
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
435
356
break;
436
357
}
437
358
if(ret < 0){
438
perror_plus("gpgme_data_read");
359
perror("gpgme_data_read");
439
360
plaintext_length = -1;
440
361
goto decrypt_end;
441
362
}
443
364
}
444
365
445
366
if(debug){
446
fprintf_plus(stderr, "Decrypted password is: ");
367
fprintf(stderr, "Decrypted password is: ");
447
368
for(ssize_t i = 0; i < plaintext_length; i++){
448
369
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
449
370
}
471
392
/* GnuTLS log function callback */
472
393
static void debuggnutls(__attribute__((unused)) int level,
473
394
const char* string){
474
fprintf_plus(stderr, "GnuTLS: %s", string);
395
fprintf(stderr, "GnuTLS: %s", string);
475
396
}
476
397
477
398
static int init_gnutls_global(const char *pubkeyfilename,
479
400
int ret;
480
401
481
402
if(debug){
482
fprintf_plus(stderr, "Initializing GnuTLS\n");
403
fprintf(stderr, "Initializing GnuTLS\n");
483
404
}
484
405
485
406
ret = gnutls_global_init();
486
407
if(ret != GNUTLS_E_SUCCESS){
487
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
488
safer_gnutls_strerror(ret));
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
489
410
return -1;
490
411
}
491
412
498
419
}
499
420
500
421
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
422
gnutls_certificate_allocate_credentials(&mc.cred);
502
423
if(ret != GNUTLS_E_SUCCESS){
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
safer_gnutls_strerror(ret));
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
505
429
gnutls_global_deinit();
506
430
return -1;
507
431
}
508
432
509
433
if(debug){
510
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
511
" secret key %s as GnuTLS credentials\n",
512
pubkeyfilename,
513
seckeyfilename);
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
514
437
}
515
438
516
439
ret = gnutls_certificate_set_openpgp_key_file
517
440
(mc.cred, pubkeyfilename, seckeyfilename,
518
441
GNUTLS_OPENPGP_FMT_BASE64);
519
442
if(ret != GNUTLS_E_SUCCESS){
520
fprintf_plus(stderr,
521
"Error[%d] while reading the OpenPGP key pair ('%s',"
522
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
523
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
524
safer_gnutls_strerror(ret));
443
fprintf(stderr,
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
fprintf(stderr, "The GnuTLS error is: %s\n",
447
safer_gnutls_strerror(ret));
525
448
goto globalfail;
526
449
}
527
450
528
451
/* GnuTLS server initialization */
529
452
ret = gnutls_dh_params_init(&mc.dh_params);
530
453
if(ret != GNUTLS_E_SUCCESS){
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
" initialization: %s\n",
533
safer_gnutls_strerror(ret));
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
534
456
goto globalfail;
535
457
}
536
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
537
459
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
540
462
goto globalfail;
541
463
}
542
464
562
484
}
563
485
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
564
486
if(ret != GNUTLS_E_SUCCESS){
565
fprintf_plus(stderr,
566
"Error in GnuTLS session initialization: %s\n",
567
safer_gnutls_strerror(ret));
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
568
489
}
569
490
570
491
{
577
498
}
578
499
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
579
500
if(ret != GNUTLS_E_SUCCESS){
580
fprintf_plus(stderr, "Syntax error at: %s\n", err);
581
fprintf_plus(stderr, "GnuTLS error: %s\n",
582
safer_gnutls_strerror(ret));
501
fprintf(stderr, "Syntax error at: %s\n", err);
502
fprintf(stderr, "GnuTLS error: %s\n",
503
safer_gnutls_strerror(ret));
583
504
gnutls_deinit(*session);
584
505
return -1;
585
506
}
594
515
}
595
516
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
596
517
if(ret != GNUTLS_E_SUCCESS){
597
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
598
safer_gnutls_strerror(ret));
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
599
520
gnutls_deinit(*session);
600
521
return -1;
601
522
}
631
552
gnutls_session_t session;
632
553
int pf; /* Protocol family */
633
554
634
errno = 0;
635
636
555
if(quit_now){
637
errno = EINTR;
638
556
return -1;
639
557
}
640
558
646
564
pf = PF_INET;
647
565
break;
648
566
default:
649
fprintf_plus(stderr, "Bad address family: %d\n", af);
650
errno = EINVAL;
567
fprintf(stderr, "Bad address family: %d\n", af);
651
568
return -1;
652
569
}
653
570
657
574
}
658
575
659
576
if(debug){
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
662
579
}
663
580
664
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
665
582
if(tcp_sd < 0){
666
int e = errno;
667
perror_plus("socket");
668
errno = e;
583
perror("socket");
669
584
goto mandos_end;
670
585
}
671
586
672
587
if(quit_now){
673
errno = EINTR;
674
588
goto mandos_end;
675
589
}
676
590
683
597
ret = inet_pton(af, ip, &to.in.sin_addr);
684
598
}
685
599
if(ret < 0 ){
686
int e = errno;
687
perror_plus("inet_pton");
688
errno = e;
600
perror("inet_pton");
689
601
goto mandos_end;
690
602
}
691
603
if(ret == 0){
692
int e = errno;
693
fprintf_plus(stderr, "Bad address: %s\n", ip);
694
errno = e;
604
fprintf(stderr, "Bad address: %s\n", ip);
695
605
goto mandos_end;
696
606
}
697
607
if(af == AF_INET6){
701
611
702
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
614
-Wunreachable-code*/
705
615
if(if_index == AVAHI_IF_UNSPEC){
706
fprintf_plus(stderr, "An IPv6 link-local address is"
707
" incomplete without a network interface\n");
708
errno = EINVAL;
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
709
618
goto mandos_end;
710
619
}
711
620
/* Set the network interface number as scope */
718
627
}
719
628
720
629
if(quit_now){
721
errno = EINTR;
722
630
goto mandos_end;
723
631
}
724
632
726
634
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
727
635
char interface[IF_NAMESIZE];
728
636
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
perror_plus("if_indextoname");
637
perror("if_indextoname");
730
638
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
733
641
}
734
642
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
737
645
}
738
646
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
647
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
654
sizeof(addrstr));
747
655
}
748
656
if(pcret == NULL){
749
perror_plus("inet_ntop");
657
perror("inet_ntop");
750
658
} else {
751
659
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
753
661
}
754
662
}
755
663
}
756
664
757
665
if(quit_now){
758
errno = EINTR;
759
666
goto mandos_end;
760
667
}
761
668
765
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
766
673
}
767
674
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
int e = errno;
770
perror_plus("connect");
771
errno = e;
772
}
675
perror("connect");
773
676
goto mandos_end;
774
677
}
775
678
776
679
if(quit_now){
777
errno = EINTR;
778
680
goto mandos_end;
779
681
}
780
682
783
685
while(true){
784
686
size_t out_size = strlen(out);
785
687
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
786
out_size - written));
688
out_size - written));
787
689
if(ret == -1){
788
int e = errno;
789
perror_plus("write");
790
errno = e;
690
perror("write");
791
691
goto mandos_end;
792
692
}
793
693
written += (size_t)ret;
803
703
}
804
704
805
705
if(quit_now){
806
errno = EINTR;
807
706
goto mandos_end;
808
707
}
809
708
}
810
709
811
710
if(debug){
812
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
813
712
}
814
713
815
714
if(quit_now){
816
errno = EINTR;
817
715
goto mandos_end;
818
716
}
819
717
820
/* Spurious warning from -Wint-to-pointer-cast */
821
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
822
719
823
720
if(quit_now){
824
errno = EINTR;
825
721
goto mandos_end;
826
722
}
827
723
828
724
do {
829
725
ret = gnutls_handshake(session);
830
726
if(quit_now){
831
errno = EINTR;
832
727
goto mandos_end;
833
728
}
834
729
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
835
730
836
731
if(ret != GNUTLS_E_SUCCESS){
837
732
if(debug){
838
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
839
734
gnutls_perror(ret);
840
735
}
841
errno = EPROTO;
842
736
goto mandos_end;
843
737
}
844
738
845
739
/* Read OpenPGP packet that contains the wanted password */
846
740
847
741
if(debug){
848
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
849
" %s\n", ip);
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
850
744
}
851
745
852
746
while(true){
853
747
854
748
if(quit_now){
855
errno = EINTR;
856
749
goto mandos_end;
857
750
}
858
751
859
752
buffer_capacity = incbuffer(&buffer, buffer_length,
860
buffer_capacity);
753
buffer_capacity);
861
754
if(buffer_capacity == 0){
862
int e = errno;
863
perror_plus("incbuffer");
864
errno = e;
755
perror("incbuffer");
865
756
goto mandos_end;
866
757
}
867
758
868
759
if(quit_now){
869
errno = EINTR;
870
760
goto mandos_end;
871
761
}
872
762
885
775
ret = gnutls_handshake(session);
886
776
887
777
if(quit_now){
888
errno = EINTR;
889
778
goto mandos_end;
890
779
}
891
780
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
892
781
if(ret < 0){
893
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
894
"***\n");
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
895
783
gnutls_perror(ret);
896
errno = EPROTO;
897
784
goto mandos_end;
898
785
}
899
786
break;
900
787
default:
901
fprintf_plus(stderr, "Unknown error while reading data from"
902
" encrypted session with Mandos server\n");
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
903
790
gnutls_bye(session, GNUTLS_SHUT_RDWR);
904
errno = EIO;
905
791
goto mandos_end;
906
792
}
907
793
} else {
910
796
}
911
797
912
798
if(debug){
913
fprintf_plus(stderr, "Closing TLS session\n");
799
fprintf(stderr, "Closing TLS session\n");
914
800
}
915
801
916
802
if(quit_now){
917
errno = EINTR;
918
803
goto mandos_end;
919
804
}
920
805
921
806
do {
922
807
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
923
808
if(quit_now){
924
errno = EINTR;
925
809
goto mandos_end;
926
810
}
927
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
928
812
929
813
if(buffer_length > 0){
930
814
ssize_t decrypted_buffer_size;
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
932
817
&decrypted_buffer);
933
818
if(decrypted_buffer_size >= 0){
934
819
935
820
written = 0;
936
821
while(written < (size_t) decrypted_buffer_size){
937
822
if(quit_now){
938
errno = EINTR;
939
823
goto mandos_end;
940
824
}
941
825
943
827
(size_t)decrypted_buffer_size - written,
944
828
stdout);
945
829
if(ret == 0 and ferror(stdout)){
946
int e = errno;
947
830
if(debug){
948
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
949
strerror(errno));
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
950
833
}
951
errno = e;
952
834
goto mandos_end;
953
835
}
954
836
written += (size_t)ret;
960
842
/* Shutdown procedure */
961
843
962
844
mandos_end:
963
{
964
int e = errno;
965
free(decrypted_buffer);
966
free(buffer);
967
if(tcp_sd >= 0){
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
969
}
970
if(ret == -1){
971
if(e == 0){
972
e = errno;
973
}
974
perror_plus("close");
975
}
976
gnutls_deinit(session);
977
errno = e;
978
if(quit_now){
979
errno = EINTR;
980
retval = -1;
981
}
845
free(decrypted_buffer);
846
free(buffer);
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
850
if(ret == -1){
851
perror("close");
852
}
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
982
856
}
983
857
return retval;
984
858
}
1009
883
switch(event){
1010
884
default:
1011
885
case AVAHI_RESOLVER_FAILURE:
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
888
avahi_strerror(avahi_server_errno(mc.server)));
1016
889
break;
1017
890
1018
891
case AVAHI_RESOLVER_FOUND:
1020
893
char ip[AVAHI_ADDRESS_STR_MAX];
1021
894
avahi_address_snprint(ip, sizeof(ip), address);
1022
895
if(debug){
1023
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
host_name, ip, (intmax_t)interface, port);
896
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
ip, (intmax_t)interface, port);
1026
899
}
1027
900
int ret = start_mandos_communication(ip, port, interface,
1028
901
avahi_proto_to_af(proto));
1029
902
if(ret == 0){
1030
903
avahi_simple_poll_quit(mc.simple_poll);
1031
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1034
904
}
1035
905
}
1036
906
}
1060
930
default:
1061
931
case AVAHI_BROWSER_FAILURE:
1062
932
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
1065
935
avahi_simple_poll_quit(mc.simple_poll);
1066
936
return;
1067
937
1074
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
945
name, type, domain, protocol, 0,
1076
946
resolve_callback, NULL) == NULL)
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
1080
949
break;
1081
950
1082
951
case AVAHI_BROWSER_REMOVE:
1085
954
case AVAHI_BROWSER_ALL_FOR_NOW:
1086
955
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1087
956
if(debug){
1088
fprintf_plus(stderr, "No Mandos server found, still"
1089
" searching...\n");
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1090
958
}
1091
959
break;
1092
960
}
1093
961
}
1094
962
1095
/* Signal handler that stops main loop after SIGTERM */
963
/* stop main loop after sigterm has been called */
1096
964
static void handle_sigterm(int sig){
1097
965
if(quit_now){
1098
966
return;
1100
968
quit_now = 1;
1101
969
signal_received = sig;
1102
970
int old_errno = errno;
1103
/* set main loop to exit */
1104
971
if(mc.simple_poll != NULL){
1105
972
avahi_simple_poll_quit(mc.simple_poll);
1106
973
}
1107
974
errno = old_errno;
1108
975
}
1109
976
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
int ret;
1112
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
if(s < 0){
1115
perror_plus("socket");
1116
return false;
1117
}
1118
strcpy(ifr->ifr_name, ifname);
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
if(ret == -1){
1121
if(debug){
1122
perror_plus("ioctl SIOCGIFFLAGS");
1123
}
1124
return false;
1125
}
1126
return true;
1127
}
1128
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1131
/* Reject the loopback device */
1132
if(ifr->ifr_flags & IFF_LOOPBACK){
1133
if(debug){
1134
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1135
ifname);
1136
}
1137
return false;
1138
}
1139
/* Accept point-to-point devices only if connect_to is specified */
1140
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1141
if(debug){
1142
fprintf_plus(stderr, "Accepting point-to-point interface"
1143
" \"%s\"\n", ifname);
1144
}
1145
return true;
1146
}
1147
/* Otherwise, reject non-broadcast-capable devices */
1148
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1149
if(debug){
1150
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1151
" \"%s\"\n", ifname);
1152
}
1153
return false;
1154
}
1155
/* Reject non-ARP interfaces (including dummy interfaces) */
1156
if(ifr->ifr_flags & IFF_NOARP){
1157
if(debug){
1158
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1159
ifname);
1160
}
1161
return false;
1162
}
1163
1164
/* Accept this device */
1165
if(debug){
1166
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1167
}
1168
return true;
1169
}
1170
1171
/*
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int good_interface(const struct dirent *if_entry){
1177
if(if_entry->d_name[0] == '.'){
1178
return 0;
1179
}
1180
1181
struct ifreq ifr;
1182
if(not get_flags(if_entry->d_name, &ifr)){
1183
if(debug){
1184
fprintf_plus(stderr, "Failed to get flags for interface "
1185
"\"%s\"\n", if_entry->d_name);
1186
}
1187
return 0;
1188
}
1189
1190
if(not good_flags(if_entry->d_name, &ifr)){
1191
return 0;
1192
}
1193
return 1;
1194
}
1195
1196
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1239
int notdotentries(const struct dirent *direntry){
1240
/* Skip "." and ".." */
1241
if(direntry->d_name[0] == '.'
1242
and (direntry->d_name[1] == '\0'
1243
or (direntry->d_name[1] == '.'
1244
and direntry->d_name[2] == '\0'))){
1245
return 0;
1246
}
1247
return 1;
1248
}
1249
1250
/* Is this directory entry a runnable program? */
1251
int runnable_hook(const struct dirent *direntry){
1252
int ret;
1253
size_t sret;
1254
struct stat st;
1255
1256
if((direntry->d_name)[0] == '\0'){
1257
/* Empty name? */
1258
return 0;
1259
}
1260
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
"abcdefghijklmnopqrstuvwxyz"
1263
"0123456789"
1264
"_-");
1265
if((direntry->d_name)[sret] != '\0'){
1266
/* Contains non-allowed characters */
1267
if(debug){
1268
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1269
direntry->d_name);
1270
}
1271
return 0;
1272
}
1273
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1282
if(ret == -1){
1283
if(debug){
1284
perror_plus("Could not stat hook");
1285
}
1286
return 0;
1287
}
1288
if(not (S_ISREG(st.st_mode))){
1289
/* Not a regular file */
1290
if(debug){
1291
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1292
direntry->d_name);
1293
}
1294
return 0;
1295
}
1296
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1297
/* Not executable */
1298
if(debug){
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
return 1;
1305
}
1306
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1308
int ret;
1309
struct timespec now;
1310
struct timespec waited_time;
1311
intmax_t block_time;
1312
1313
while(true){
1314
if(mc.current_server == NULL){
1315
if (debug){
1316
fprintf_plus(stderr, "Wait until first server is found."
1317
" No timeout!\n");
1318
}
1319
ret = avahi_simple_poll_iterate(s, -1);
1320
} else {
1321
if (debug){
1322
fprintf_plus(stderr, "Check current_server if we should run"
1323
" it, or wait\n");
1324
}
1325
/* the current time */
1326
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1327
if(ret == -1){
1328
perror_plus("clock_gettime");
1329
return -1;
1330
}
1331
/* Calculating in ms how long time between now and server
1332
who we visted longest time ago. Now - last seen. */
1333
waited_time.tv_sec = (now.tv_sec
1334
- mc.current_server->last_seen.tv_sec);
1335
waited_time.tv_nsec = (now.tv_nsec
1336
- mc.current_server->last_seen.tv_nsec);
1337
/* total time is 10s/10,000ms.
1338
Converting to s from ms by dividing by 1,000,
1339
and ns to ms by dividing by 1,000,000. */
1340
block_time = ((retry_interval
1341
- ((intmax_t)waited_time.tv_sec * 1000))
1342
- ((intmax_t)waited_time.tv_nsec / 1000000));
1343
1344
if (debug){
1345
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1346
block_time);
1347
}
1348
1349
if(block_time <= 0){
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1354
if(ret == 0){
1355
avahi_simple_poll_quit(mc.simple_poll);
1356
return 0;
1357
}
1358
ret = clock_gettime(CLOCK_MONOTONIC,
1359
&mc.current_server->last_seen);
1360
if(ret == -1){
1361
perror_plus("clock_gettime");
1362
return -1;
1363
}
1364
mc.current_server = mc.current_server->next;
1365
block_time = 0; /* Call avahi to find new Mandos
1366
servers, but don't block */
1367
}
1368
1369
ret = avahi_simple_poll_iterate(s, (int)block_time);
1370
}
1371
if(ret != 0){
1372
if (ret > 0 or errno != EINTR){
1373
return (ret != 1) ? ret : 0;
1374
}
1375
}
1376
}
1377
}
1378
1379
bool run_network_hooks(const char *mode, const char *interface,
1380
const float delay){
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
alphasort);
1386
if(numhooks == -1){
1387
perror_plus("scandir");
1388
} else {
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1394
if(ret < 0){
1395
perror_plus("asprintf");
1396
continue;
1397
}
1398
pid_t hook_pid = fork();
1399
if(hook_pid == 0){
1400
/* Child */
1401
dup2(devnull, STDIN_FILENO);
1402
close(devnull);
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1405
if(ret == -1){
1406
perror_plus("setenv");
1407
return false;
1408
}
1409
ret = setenv("DEVICE", interface, 1);
1410
if(ret == -1){
1411
perror_plus("setenv");
1412
return false;
1413
}
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1415
if(ret == -1){
1416
perror_plus("setenv");
1417
return false;
1418
}
1419
ret = setenv("MODE", mode, 1);
1420
if(ret == -1){
1421
perror_plus("setenv");
1422
return false;
1423
}
1424
char *delaystring;
1425
ret = asprintf(&delaystring, "%f", delay);
1426
if(ret == -1){
1427
perror_plus("asprintf");
1428
return false;
1429
}
1430
ret = setenv("DELAY", delaystring, 1);
1431
if(ret == -1){
1432
free(delaystring);
1433
perror_plus("setenv");
1434
return false;
1435
}
1436
free(delaystring);
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1439
} else {
1440
int status;
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1442
perror_plus("waitpid");
1443
free(fullname);
1444
continue;
1445
}
1446
if(WIFEXITED(status)){
1447
if(WEXITSTATUS(status) != 0){
1448
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1449
" with status %d\n", direntry->d_name,
1450
WEXITSTATUS(status));
1451
free(fullname);
1452
continue;
1453
}
1454
} else if(WIFSIGNALED(status)){
1455
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1456
" signal %d\n", direntry->d_name,
1457
WTERMSIG(status));
1458
free(fullname);
1459
continue;
1460
} else {
1461
fprintf_plus(stderr, "Warning: network hook \"%s\""
1462
" crashed\n", direntry->d_name);
1463
free(fullname);
1464
continue;
1465
}
1466
}
1467
free(fullname);
1468
if(quit_now){
1469
break;
1470
}
1471
}
1472
close(devnull);
1473
}
1474
return true;
1475
}
1476
1477
977
int main(int argc, char *argv[]){
1478
978
AvahiSServiceBrowser *sb = NULL;
1479
979
int error;
1481
981
intmax_t tmpmax;
1482
982
char *tmp;
1483
983
int exitcode = EXIT_SUCCESS;
1484
const char *interface = "";
984
const char *interface = "eth0";
1485
985
struct ifreq network;
1486
986
int sd = -1;
1487
987
bool take_down_interface = false;
1488
988
uid_t uid;
1489
989
gid_t gid;
990
char *connect_to = NULL;
1490
991
char tempdir[] = "/tmp/mandosXXXXXX";
1491
992
bool tempdir_created = false;
1492
993
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1496
997
bool gnutls_initialized = false;
1497
998
bool gpgme_initialized = false;
1498
999
float delay = 2.5f;
1499
double retry_interval = 10; /* 10s between trying a server and
1500
retrying the same server again */
1501
1000
1502
1001
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1503
1002
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1509
1008
errno = 0;
1510
1009
ret = setgid(gid);
1511
1010
if(ret == -1){
1512
perror_plus("setgid");
1011
perror("setgid");
1513
1012
}
1514
1013
1515
1014
/* Lower user privileges (temporarily) */
1516
1015
errno = 0;
1517
1016
ret = seteuid(uid);
1518
1017
if(ret == -1){
1519
perror_plus("seteuid");
1018
perror("seteuid");
1520
1019
}
1521
1020
1522
1021
if(quit_now){
1557
1056
.arg = "SECONDS",
1558
1057
.doc = "Maximum delay to wait for interface startup",
1559
1058
.group = 2 },
1560
{ .name = "retry", .key = 132,
1561
.arg = "SECONDS",
1562
.doc = "Retry interval used when denied by the mandos server",
1563
.group = 2 },
1564
{ .name = "network-hook-dir", .key = 133,
1565
.arg = "DIR",
1566
.doc = "Directory where network hooks are located",
1567
.group = 2 },
1568
/*
1569
* These reproduce what we would get without ARGP_NO_HELP
1570
*/
1571
{ .name = "help", .key = '?',
1572
.doc = "Give this help list", .group = -1 },
1573
{ .name = "usage", .key = -3,
1574
.doc = "Give a short usage message", .group = -1 },
1575
{ .name = "version", .key = 'V',
1576
.doc = "Print program version", .group = -1 },
1577
1059
{ .name = NULL }
1578
1060
};
1579
1061
1580
1062
error_t parse_opt(int key, char *arg,
1581
1063
struct argp_state *state){
1582
errno = 0;
1583
1064
switch(key){
1584
1065
case 128: /* --debug */
1585
1066
debug = true;
1601
1082
tmpmax = strtoimax(arg, &tmp, 10);
1602
1083
if(errno != 0 or tmp == arg or *tmp != '\0'
1603
1084
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1604
argp_error(state, "Bad number of DH bits");
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
1605
1087
}
1606
1088
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1607
1089
break;
1612
1094
errno = 0;
1613
1095
delay = strtof(arg, &tmp);
1614
1096
if(errno != 0 or tmp == arg or *tmp != '\0'){
1615
argp_error(state, "Bad delay");
1616
}
1617
case 132: /* --retry */
1618
errno = 0;
1619
retry_interval = strtod(arg, &tmp);
1620
if(errno != 0 or tmp == arg or *tmp != '\0'
1621
or (retry_interval * 1000) > INT_MAX
1622
or retry_interval < 0){
1623
argp_error(state, "Bad retry interval");
1624
}
1625
break;
1626
case 133: /* --network-hook-dir */
1627
hookdir = arg;
1628
break;
1629
/*
1630
* These reproduce what we would get without ARGP_NO_HELP
1631
*/
1632
case '?': /* --help */
1633
argp_state_help(state, state->out_stream,
1634
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1635
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1636
case -3: /* --usage */
1637
argp_state_help(state, state->out_stream,
1638
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1639
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1642
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1643
exit(argp_err_exit_status);
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
1644
1104
break;
1645
1105
default:
1646
1106
return ARGP_ERR_UNKNOWN;
1647
1107
}
1648
return errno;
1108
return 0;
1649
1109
}
1650
1110
1651
1111
struct argp argp = { .options = options, .parser = parse_opt,
1652
1112
.args_doc = "",
1653
1113
.doc = "Mandos client -- Get and decrypt"
1654
1114
" passwords from a Mandos server" };
1655
ret = argp_parse(&argp, argc, argv,
1656
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1657
switch(ret){
1658
case 0:
1659
break;
1660
case ENOMEM:
1661
default:
1662
errno = ret;
1663
perror_plus("argp_parse");
1664
exitcode = EX_OSERR;
1665
goto end;
1666
case EINVAL:
1667
exitcode = EX_USAGE;
1668
goto end;
1669
}
1670
}
1671
1672
{
1673
/* Work around Debian bug #633582:
1674
<http://bugs.debian.org/633582> */
1675
struct stat st;
1676
1677
/* Re-raise priviliges */
1678
errno = 0;
1679
ret = seteuid(0);
1680
if(ret == -1){
1681
perror_plus("seteuid");
1682
}
1683
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1688
} else {
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1690
if(ret == -1){
1691
perror_plus("fstat");
1692
} else {
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1696
if(ret == -1){
1697
perror_plus("fchown");
1698
}
1699
}
1700
}
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1702
}
1703
}
1704
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1709
} else {
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1711
if(ret == -1){
1712
perror_plus("fstat");
1713
} else {
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1717
if(ret == -1){
1718
perror_plus("fchown");
1719
}
1720
}
1721
}
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1723
}
1724
}
1725
1726
/* Lower privileges */
1727
errno = 0;
1728
ret = seteuid(uid);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1731
}
1732
}
1733
1734
/* Run network hooks */
1735
{
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
1741
}
1742
if(not run_network_hooks("start", interface, delay)){
1743
goto end;
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1116
if(ret == ARGP_ERR_UNKNOWN){
1117
fprintf(stderr, "Unknown error while parsing arguments\n");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1750
1120
}
1751
1121
}
1752
1122
1754
1124
avahi_set_log_function(empty_log);
1755
1125
}
1756
1126
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1761
alphasort);
1762
if(ret == 0){
1763
/* No up interfaces, look for any good interfaces */
1764
free(direntries);
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1766
alphasort);
1767
}
1768
if(ret >= 1){
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1771
if(debug){
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1773
}
1774
if(interface == NULL){
1775
perror_plus("malloc");
1776
free(direntries);
1777
exitcode = EXIT_FAILURE;
1778
goto end;
1779
}
1780
free(direntries);
1781
} else {
1782
free(direntries);
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
1785
goto end;
1786
}
1787
}
1788
1789
1127
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1790
1128
from the signal handler */
1791
1129
/* Initialize the pseudo-RNG for Avahi */
1792
1130
srand((unsigned int) time(NULL));
1793
1131
mc.simple_poll = avahi_simple_poll_new();
1794
1132
if(mc.simple_poll == NULL){
1795
fprintf_plus(stderr,
1796
"Avahi: Failed to create simple poll object.\n");
1797
exitcode = EX_UNAVAILABLE;
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
1798
1135
goto end;
1799
1136
}
1800
1137
1801
1138
sigemptyset(&sigterm_action.sa_mask);
1802
1139
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1803
1140
if(ret == -1){
1804
perror_plus("sigaddset");
1805
exitcode = EX_OSERR;
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
1806
1143
goto end;
1807
1144
}
1808
1145
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1809
1146
if(ret == -1){
1810
perror_plus("sigaddset");
1811
exitcode = EX_OSERR;
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
1812
1149
goto end;
1813
1150
}
1814
1151
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1815
1152
if(ret == -1){
1816
perror_plus("sigaddset");
1817
exitcode = EX_OSERR;
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
1818
1155
goto end;
1819
1156
}
1820
1157
/* Need to check if the handler is SIG_IGN before handling:
1823
1160
*/
1824
1161
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1825
1162
if(ret == -1){
1826
perror_plus("sigaction");
1827
return EX_OSERR;
1163
perror("sigaction");
1164
return EXIT_FAILURE;
1828
1165
}
1829
1166
if(old_sigterm_action.sa_handler != SIG_IGN){
1830
1167
ret = sigaction(SIGINT, &sigterm_action, NULL);
1831
1168
if(ret == -1){
1832
perror_plus("sigaction");
1833
exitcode = EX_OSERR;
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
1834
1171
goto end;
1835
1172
}
1836
1173
}
1837
1174
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1838
1175
if(ret == -1){
1839
perror_plus("sigaction");
1840
return EX_OSERR;
1176
perror("sigaction");
1177
return EXIT_FAILURE;
1841
1178
}
1842
1179
if(old_sigterm_action.sa_handler != SIG_IGN){
1843
1180
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1844
1181
if(ret == -1){
1845
perror_plus("sigaction");
1846
exitcode = EX_OSERR;
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
1847
1184
goto end;
1848
1185
}
1849
1186
}
1850
1187
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1851
1188
if(ret == -1){
1852
perror_plus("sigaction");
1853
return EX_OSERR;
1189
perror("sigaction");
1190
return EXIT_FAILURE;
1854
1191
}
1855
1192
if(old_sigterm_action.sa_handler != SIG_IGN){
1856
1193
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1857
1194
if(ret == -1){
1858
perror_plus("sigaction");
1859
exitcode = EX_OSERR;
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
1860
1197
goto end;
1861
1198
}
1862
1199
}
1863
1200
1864
1201
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
1202
if(interface[0] != '\0'){
1866
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1867
1204
if(if_index == 0){
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1870
1207
goto end;
1871
1208
}
1872
1209
1878
1215
errno = 0;
1879
1216
ret = seteuid(0);
1880
1217
if(ret == -1){
1881
perror_plus("seteuid");
1218
perror("seteuid");
1882
1219
}
1883
1220
1884
1221
#ifdef __linux__
1885
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1223
messages to mess up the prompt */
1887
1224
ret = klogctl(8, NULL, 5);
1888
1225
bool restore_loglevel = true;
1889
1226
if(ret == -1){
1890
1227
restore_loglevel = false;
1891
perror_plus("klogctl");
1228
perror("klogctl");
1892
1229
}
1893
1230
#endif /* __linux__ */
1894
1231
1895
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1896
1233
if(sd < 0){
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1899
1236
#ifdef __linux__
1900
1237
if(restore_loglevel){
1901
1238
ret = klogctl(7, NULL, 0);
1902
1239
if(ret == -1){
1903
perror_plus("klogctl");
1240
perror("klogctl");
1904
1241
}
1905
1242
}
1906
1243
#endif /* __linux__ */
1908
1245
errno = 0;
1909
1246
ret = seteuid(uid);
1910
1247
if(ret == -1){
1911
perror_plus("seteuid");
1248
perror("seteuid");
1912
1249
}
1913
1250
goto end;
1914
1251
}
1915
1252
strcpy(network.ifr_name, interface);
1916
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1917
1254
if(ret == -1){
1918
perror_plus("ioctl SIOCGIFFLAGS");
1255
perror("ioctl SIOCGIFFLAGS");
1919
1256
#ifdef __linux__
1920
1257
if(restore_loglevel){
1921
1258
ret = klogctl(7, NULL, 0);
1922
1259
if(ret == -1){
1923
perror_plus("klogctl");
1260
perror("klogctl");
1924
1261
}
1925
1262
}
1926
1263
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1264
exitcode = EXIT_FAILURE;
1928
1265
/* Lower privileges */
1929
1266
errno = 0;
1930
1267
ret = seteuid(uid);
1931
1268
if(ret == -1){
1932
perror_plus("seteuid");
1269
perror("seteuid");
1933
1270
}
1934
1271
goto end;
1935
1272
}
1939
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1940
1277
if(ret == -1){
1941
1278
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1944
1281
#ifdef __linux__
1945
1282
if(restore_loglevel){
1946
1283
ret = klogctl(7, NULL, 0);
1947
1284
if(ret == -1){
1948
perror_plus("klogctl");
1285
perror("klogctl");
1949
1286
}
1950
1287
}
1951
1288
#endif /* __linux__ */
1953
1290
errno = 0;
1954
1291
ret = seteuid(uid);
1955
1292
if(ret == -1){
1956
perror_plus("seteuid");
1293
perror("seteuid");
1957
1294
}
1958
1295
goto end;
1959
1296
}
1960
1297
}
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1298
/* sleep checking until interface is running */
1963
1299
for(int i=0; i < delay * 4; i++){
1964
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1965
1301
if(ret == -1){
1966
perror_plus("ioctl SIOCGIFFLAGS");
1302
perror("ioctl SIOCGIFFLAGS");
1967
1303
} else if(network.ifr_flags & IFF_RUNNING){
1968
1304
break;
1969
1305
}
1970
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
1307
ret = nanosleep(&sleeptime, NULL);
1972
1308
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1309
perror("nanosleep");
1974
1310
}
1975
1311
}
1976
1312
if(not take_down_interface){
1977
1313
/* We won't need the socket anymore */
1978
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
1315
if(ret == -1){
1980
perror_plus("close");
1316
perror("close");
1981
1317
}
1982
1318
}
1983
1319
#ifdef __linux__
1985
1321
/* Restores kernel loglevel to default */
1986
1322
ret = klogctl(7, NULL, 0);
1987
1323
if(ret == -1){
1988
perror_plus("klogctl");
1324
perror("klogctl");
1989
1325
}
1990
1326
}
1991
1327
#endif /* __linux__ */
1992
1328
/* Lower privileges */
1993
1329
errno = 0;
1994
/* Lower privileges */
1995
ret = seteuid(uid);
1996
if(ret == -1){
1997
perror_plus("seteuid");
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
1336
} else {
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1998
1342
}
1999
1343
}
2000
1344
2004
1348
2005
1349
ret = init_gnutls_global(pubkey, seckey);
2006
1350
if(ret == -1){
2007
fprintf_plus(stderr, "init_gnutls_global failed\n");
2008
exitcode = EX_UNAVAILABLE;
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2009
1353
goto end;
2010
1354
} else {
2011
1355
gnutls_initialized = true;
2015
1359
goto end;
2016
1360
}
2017
1361
1362
tempdir_created = true;
2018
1363
if(mkdtemp(tempdir) == NULL){
2019
perror_plus("mkdtemp");
1364
tempdir_created = false;
1365
perror("mkdtemp");
2020
1366
goto end;
2021
1367
}
2022
tempdir_created = true;
2023
1368
2024
1369
if(quit_now){
2025
1370
goto end;
2026
1371
}
2027
1372
2028
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
2029
fprintf_plus(stderr, "init_gpgme failed\n");
2030
exitcode = EX_UNAVAILABLE;
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2031
1376
goto end;
2032
1377
} else {
2033
1378
gpgme_initialized = true;
2042
1387
/* (Mainly meant for debugging) */
2043
1388
char *address = strrchr(connect_to, ':');
2044
1389
if(address == NULL){
2045
fprintf_plus(stderr, "No colon in address\n");
2046
exitcode = EX_USAGE;
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2047
1392
goto end;
2048
1393
}
2049
1394
2056
1401
tmpmax = strtoimax(address+1, &tmp, 10);
2057
1402
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2058
1403
or tmpmax != (uint16_t)tmpmax){
2059
fprintf_plus(stderr, "Bad port number\n");
2060
exitcode = EX_USAGE;
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2061
1406
goto end;
2062
1407
}
2063
1408
2067
1412
2068
1413
port = (uint16_t)tmpmax;
2069
1414
*address = '\0';
1415
address = connect_to;
2070
1416
/* Colon in address indicates IPv6 */
2071
1417
int af;
2072
if(strchr(connect_to, ':') != NULL){
1418
if(strchr(address, ':') != NULL){
2073
1419
af = AF_INET6;
2074
/* Accept [] around IPv6 address - see RFC 5952 */
2075
if(connect_to[0] == '[' and address[-1] == ']')
2076
{
2077
connect_to++;
2078
address[-1] = '\0';
2079
}
2080
1420
} else {
2081
1421
af = AF_INET;
2082
1422
}
2083
address = connect_to;
2084
1423
2085
1424
if(quit_now){
2086
1425
goto end;
2087
1426
}
2088
1427
2089
while(not quit_now){
2090
ret = start_mandos_communication(address, port, if_index, af);
2091
if(quit_now or ret == 0){
2092
break;
2093
}
2094
if(debug){
2095
fprintf_plus(stderr, "Retrying in %d seconds\n",
2096
(int)retry_interval);
2097
}
2098
sleep((int)retry_interval);
2099
}
2100
2101
if (not quit_now){
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2102
1432
exitcode = EXIT_SUCCESS;
2103
1433
}
2104
2105
1434
goto end;
2106
1435
}
2107
1436
2129
1458
2130
1459
/* Check if creating the Avahi server object succeeded */
2131
1460
if(mc.server == NULL){
2132
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2133
avahi_strerror(error));
2134
exitcode = EX_UNAVAILABLE;
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
2135
1464
goto end;
2136
1465
}
2137
1466
2144
1473
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2145
1474
NULL, 0, browse_callback, NULL);
2146
1475
if(sb == NULL){
2147
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2148
avahi_strerror(avahi_server_errno(mc.server)));
2149
exitcode = EX_UNAVAILABLE;
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
2150
1479
goto end;
2151
1480
}
2152
1481
2157
1486
/* Run the main loop */
2158
1487
2159
1488
if(debug){
2160
fprintf_plus(stderr, "Starting Avahi loop search\n");
2161
}
2162
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2165
if(debug){
2166
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2167
(ret == 0) ? "successfully" : "with error");
2168
}
1489
fprintf(stderr, "Starting Avahi loop search\n");
1490
}
1491
1492
avahi_simple_poll_loop(mc.simple_poll);
2169
1493
2170
1494
end:
2171
1495
2172
1496
if(debug){
2173
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1497
fprintf(stderr, "%s exiting\n", argv[0]);
2174
1498
}
2175
1499
2176
1500
/* Cleanup things */
2192
1516
if(gpgme_initialized){
2193
1517
gpgme_release(mc.ctx);
2194
1518
}
2195
2196
/* Cleans up the circular linked list of Mandos servers the client
2197
has seen */
2198
if(mc.current_server != NULL){
2199
mc.current_server->prev->next = NULL;
2200
while(mc.current_server != NULL){
2201
server *next = mc.current_server->next;
2202
free(mc.current_server);
2203
mc.current_server = next;
2204
}
2205
}
2206
1519
2207
/* Re-raise priviliges */
2208
{
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
2209
1523
errno = 0;
2210
1524
ret = seteuid(0);
2211
1525
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2214
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
2217
}
2218
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
2221
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2222
1530
if(ret == -1){
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
2226
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2227
1535
if(ret == -1){
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1536
perror("ioctl SIOCSIFFLAGS");
2229
1537
}
2230
1538
}
2231
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
1540
if(ret == -1){
2233
perror_plus("close");
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
2234
1548
}
2235
1549
}
2236
1550
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
2242
}
2243
1551
2244
/* Removes the GPGME temp directory and all files inside */
1552
/* Removes the temp directory used by GPGME */
2245
1553
if(tempdir_created){
2246
struct dirent **direntries = NULL;
2247
struct dirent *direntry = NULL;
2248
int numentries = scandir(tempdir, &direntries, notdotentries,
2249
alphasort);
2250
if (numentries > 0){
2251
for(int i = 0; i < numentries; i++){
2252
direntry = direntries[i];
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1559
perror("opendir");
1560
}
1561
} else {
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
2253
1574
char *fullname = NULL;
2254
1575
ret = asprintf(&fullname, "%s/%s", tempdir,
2255
1576
direntry->d_name);
2256
1577
if(ret < 0){
2257
perror_plus("asprintf");
1578
perror("asprintf");
2258
1579
continue;
2259
1580
}
2260
1581
ret = remove(fullname);
2261
1582
if(ret == -1){
2262
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2263
strerror(errno));
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
2264
1585
}
2265
1586
free(fullname);
2266
1587
}
2267
}
2268
2269
/* need to clean even if 0 because man page doesn't specify */
2270
free(direntries);
2271
if (numentries == -1){
2272
perror_plus("scandir");
1588
closedir(d);
2273
1589
}
2274
1590
ret = rmdir(tempdir);
2275
1591
if(ret == -1 and errno != ENOENT){
2276
perror_plus("rmdir");
1592
perror("rmdir");
2277
1593
}
2278
1594
}
2279
1595
2284
1600
&old_sigterm_action,
2285
1601
NULL));
2286
1602
if(ret == -1){
2287
perror_plus("sigaction");
1603
perror("sigaction");
2288
1604
}
2289
1605
do {
2290
1606
ret = raise(signal_received);
2291
1607
} while(ret != 0 and errno == EINTR);
2292
1608
if(ret != 0){
2293
perror_plus("raise");
1609
perror("raise");
2294
1610
abort();
2295
1611
}
2296
1612
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0