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- Committer: Teddy Hogeborn
- Date: 2009-10-25 19:06:56 UTC
- Revision ID: teddy@fukt.bsnet.se-20091025190656-jdj54g1ra7wbglxh
* Makefile: Don't use PIE if BROKEN_PIE is set.
* debian/rules: Set BROKEN_PIE on mips and mipsel architectures.
* debian/rules: Set BROKEN_PIE on mips and mipsel architectures.
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
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 */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
75
setgid(), pause() */
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
#include <grp.h> /* setgroups() */
91
85
92
86
#ifdef __linux__
93
87
#include <sys/klog.h> /* klogctl() */
111
105
init_gnutls_session(),
112
106
GNUTLS_* */
113
107
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
116
110
117
111
/* GPGME */
118
112
#include <gpgme.h> /* All GPGME types, constants and
126
120
#define PATHDIR "/conf/conf.d/mandos"
127
121
#define SECKEY "seckey.txt"
128
122
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
123
131
124
bool debug = false;
132
125
static const char mandos_protocol_version[] = "1";
133
126
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
uid_t uid = 65534;
139
gid_t gid = 65534;
140
141
/* Doubly linked list that need to be circularly linked when used */
142
typedef struct server{
143
const char *ip;
144
uint16_t port;
145
AvahiIfIndex if_index;
146
int af;
147
struct timespec last_seen;
148
struct server *next;
149
struct server *prev;
150
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
151
128
152
129
/* Used for passing in values through the Avahi callback functions */
153
130
typedef struct {
158
135
gnutls_dh_params_t dh_params;
159
136
const char *priority;
160
137
gpgme_ctx_t ctx;
161
server *current_server;
162
138
} mandos_context;
163
139
164
140
/* global context so signal handler can reach it*/
165
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
142
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
169
144
170
145
sig_atomic_t quit_now = 0;
171
146
int signal_received = 0;
172
147
173
/* Function to use when printing errors */
174
void perror_plus(const char *print_text){
175
int e = errno;
176
fprintf(stderr, "Mandos plugin %s: ",
177
program_invocation_short_name);
178
errno = e;
179
perror(print_text);
180
}
181
182
__attribute__((format (gnu_printf, 2, 3)))
183
int fprintf_plus(FILE *stream, const char *format, ...){
184
va_list ap;
185
va_start (ap, format);
186
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
188
program_invocation_short_name));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
}
191
192
148
/*
193
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
194
150
* bytes. "buffer_capacity" is how much is currently allocated,
195
151
* "buffer_length" is how much is already used.
196
152
*/
197
153
size_t incbuffer(char **buffer, size_t buffer_length,
198
size_t buffer_capacity){
154
size_t buffer_capacity){
199
155
if(buffer_length + BUFFER_SIZE > buffer_capacity){
200
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
157
if(buffer == NULL){
206
162
return buffer_capacity;
207
163
}
208
164
209
/* Add server to set of servers to retry periodically */
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
212
int ret;
213
server *new_server = malloc(sizeof(server));
214
if(new_server == NULL){
215
perror_plus("malloc");
216
return false;
217
}
218
*new_server = (server){ .ip = strdup(ip),
219
.port = port,
220
.if_index = if_index,
221
.af = af };
222
if(new_server->ip == NULL){
223
perror_plus("strdup");
224
return false;
225
}
226
/* Special case of first server */
227
if (mc.current_server == NULL){
228
new_server->next = new_server;
229
new_server->prev = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
232
} else {
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
235
new_server->prev->next = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
return true;
244
}
245
246
165
/*
247
166
* Initialize GPGME.
248
167
*/
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
251
170
gpgme_error_t rc;
252
171
gpgme_engine_info_t engine_info;
253
172
262
181
263
182
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
183
if(fd == -1){
265
perror_plus("open");
184
perror("open");
266
185
return false;
267
186
}
268
187
269
188
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
189
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
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));
273
192
return false;
274
193
}
275
194
276
195
rc = gpgme_op_import(mc.ctx, pgp_data);
277
196
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
280
199
return false;
281
200
}
282
201
283
202
ret = (int)TEMP_FAILURE_RETRY(close(fd));
284
203
if(ret == -1){
285
perror_plus("close");
204
perror("close");
286
205
}
287
206
gpgme_data_release(pgp_data);
288
207
return true;
289
208
}
290
209
291
210
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
211
fprintf(stderr, "Initializing GPGME\n");
293
212
}
294
213
295
214
/* Init GPGME */
296
215
gpgme_check_version(NULL);
297
216
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
217
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
301
220
return false;
302
221
}
303
222
304
/* Set GPGME home directory for the OpenPGP engine only */
223
/* Set GPGME home directory for the OpenPGP engine only */
305
224
rc = gpgme_get_engine_info(&engine_info);
306
225
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
309
228
return false;
310
229
}
311
230
while(engine_info != NULL){
317
236
engine_info = engine_info->next;
318
237
}
319
238
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
322
240
return false;
323
241
}
324
242
325
243
/* Create new GPGME "context" */
326
244
rc = gpgme_new(&(mc.ctx));
327
245
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
331
248
return false;
332
249
}
333
250
352
269
ssize_t plaintext_length = 0;
353
270
354
271
if(debug){
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
273
}
357
274
358
275
/* Create new GPGME data buffer from memory cryptotext */
359
276
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
360
277
0);
361
278
if(rc != GPG_ERR_NO_ERROR){
362
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
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));
364
281
return -1;
365
282
}
366
283
367
284
/* Create new empty GPGME data buffer for the plaintext */
368
285
rc = gpgme_data_new(&dh_plain);
369
286
if(rc != GPG_ERR_NO_ERROR){
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
373
289
gpgme_data_release(dh_crypto);
374
290
return -1;
375
291
}
378
294
data buffer */
379
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
296
if(rc != GPG_ERR_NO_ERROR){
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
383
299
plaintext_length = -1;
384
300
if(debug){
385
301
gpgme_decrypt_result_t result;
386
302
result = gpgme_op_decrypt_result(mc.ctx);
387
303
if(result == NULL){
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
305
} else {
390
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
391
result->unsupported_algorithm);
392
fprintf_plus(stderr, "Wrong key usage: %u\n",
393
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);
394
310
if(result->file_name != NULL){
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
311
fprintf(stderr, "File name: %s\n", result->file_name);
396
312
}
397
313
gpgme_recipient_t recipient;
398
314
recipient = result->recipients;
399
315
while(recipient != NULL){
400
fprintf_plus(stderr, "Public key algorithm: %s\n",
401
gpgme_pubkey_algo_name
402
(recipient->pubkey_algo));
403
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
404
fprintf_plus(stderr, "Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "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");
407
322
recipient = recipient->next;
408
323
}
409
324
}
412
327
}
413
328
414
329
if(debug){
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
331
}
417
332
418
333
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
334
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
335
perror("gpgme_data_seek");
421
336
plaintext_length = -1;
422
337
goto decrypt_end;
423
338
}
425
340
*plaintext = NULL;
426
341
while(true){
427
342
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
343
(size_t)plaintext_length,
344
plaintext_capacity);
430
345
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
434
349
}
435
350
436
351
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
441
356
break;
442
357
}
443
358
if(ret < 0){
444
perror_plus("gpgme_data_read");
359
perror("gpgme_data_read");
445
360
plaintext_length = -1;
446
361
goto decrypt_end;
447
362
}
449
364
}
450
365
451
366
if(debug){
452
fprintf_plus(stderr, "Decrypted password is: ");
367
fprintf(stderr, "Decrypted password is: ");
453
368
for(ssize_t i = 0; i < plaintext_length; i++){
454
369
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
455
370
}
477
392
/* GnuTLS log function callback */
478
393
static void debuggnutls(__attribute__((unused)) int level,
479
394
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
395
fprintf(stderr, "GnuTLS: %s", string);
481
396
}
482
397
483
398
static int init_gnutls_global(const char *pubkeyfilename,
485
400
int ret;
486
401
487
402
if(debug){
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
403
fprintf(stderr, "Initializing GnuTLS\n");
489
404
}
490
405
491
406
ret = gnutls_global_init();
492
407
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
495
410
return -1;
496
411
}
497
412
504
419
}
505
420
506
421
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
422
gnutls_certificate_allocate_credentials(&mc.cred);
508
423
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
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));
511
429
gnutls_global_deinit();
512
430
return -1;
513
431
}
514
432
515
433
if(debug){
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
520
437
}
521
438
522
439
ret = gnutls_certificate_set_openpgp_key_file
523
440
(mc.cred, pubkeyfilename, seckeyfilename,
524
441
GNUTLS_OPENPGP_FMT_BASE64);
525
442
if(ret != GNUTLS_E_SUCCESS){
526
fprintf_plus(stderr,
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
528
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
529
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
530
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));
531
448
goto globalfail;
532
449
}
533
450
534
451
/* GnuTLS server initialization */
535
452
ret = gnutls_dh_params_init(&mc.dh_params);
536
453
if(ret != GNUTLS_E_SUCCESS){
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
540
456
goto globalfail;
541
457
}
542
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
459
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
546
462
goto globalfail;
547
463
}
548
464
568
484
}
569
485
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
486
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
574
489
}
575
490
576
491
{
583
498
}
584
499
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
585
500
if(ret != GNUTLS_E_SUCCESS){
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
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));
589
504
gnutls_deinit(*session);
590
505
return -1;
591
506
}
600
515
}
601
516
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
517
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
605
520
gnutls_deinit(*session);
606
521
return -1;
607
522
}
637
552
gnutls_session_t session;
638
553
int pf; /* Protocol family */
639
554
640
errno = 0;
641
642
555
if(quit_now){
643
errno = EINTR;
644
556
return -1;
645
557
}
646
558
652
564
pf = PF_INET;
653
565
break;
654
566
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
656
errno = EINVAL;
567
fprintf(stderr, "Bad address family: %d\n", af);
657
568
return -1;
658
569
}
659
570
663
574
}
664
575
665
576
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
668
579
}
669
580
670
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
582
if(tcp_sd < 0){
672
int e = errno;
673
perror_plus("socket");
674
errno = e;
583
perror("socket");
675
584
goto mandos_end;
676
585
}
677
586
678
587
if(quit_now){
679
errno = EINTR;
680
588
goto mandos_end;
681
589
}
682
590
689
597
ret = inet_pton(af, ip, &to.in.sin_addr);
690
598
}
691
599
if(ret < 0 ){
692
int e = errno;
693
perror_plus("inet_pton");
694
errno = e;
600
perror("inet_pton");
695
601
goto mandos_end;
696
602
}
697
603
if(ret == 0){
698
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
700
errno = e;
604
fprintf(stderr, "Bad address: %s\n", ip);
701
605
goto mandos_end;
702
606
}
703
607
if(af == AF_INET6){
707
611
708
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
614
-Wunreachable-code*/
711
615
if(if_index == AVAHI_IF_UNSPEC){
712
fprintf_plus(stderr, "An IPv6 link-local address is"
713
" incomplete without a network interface\n");
714
errno = EINVAL;
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
715
618
goto mandos_end;
716
619
}
717
620
/* Set the network interface number as scope */
724
627
}
725
628
726
629
if(quit_now){
727
errno = EINTR;
728
630
goto mandos_end;
729
631
}
730
632
732
634
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
733
635
char interface[IF_NAMESIZE];
734
636
if(if_indextoname((unsigned int)if_index, interface) == NULL){
735
perror_plus("if_indextoname");
637
perror("if_indextoname");
736
638
} else {
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
739
641
}
740
642
} else {
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
743
645
}
744
646
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
745
647
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
752
654
sizeof(addrstr));
753
655
}
754
656
if(pcret == NULL){
755
perror_plus("inet_ntop");
657
perror("inet_ntop");
756
658
} else {
757
659
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
759
661
}
760
662
}
761
663
}
762
664
763
665
if(quit_now){
764
errno = EINTR;
765
666
goto mandos_end;
766
667
}
767
668
771
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
772
673
}
773
674
if(ret < 0){
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
int e = errno;
776
perror_plus("connect");
777
errno = e;
778
}
675
perror("connect");
779
676
goto mandos_end;
780
677
}
781
678
782
679
if(quit_now){
783
errno = EINTR;
784
680
goto mandos_end;
785
681
}
786
682
789
685
while(true){
790
686
size_t out_size = strlen(out);
791
687
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
792
out_size - written));
688
out_size - written));
793
689
if(ret == -1){
794
int e = errno;
795
perror_plus("write");
796
errno = e;
690
perror("write");
797
691
goto mandos_end;
798
692
}
799
693
written += (size_t)ret;
809
703
}
810
704
811
705
if(quit_now){
812
errno = EINTR;
813
706
goto mandos_end;
814
707
}
815
708
}
816
709
817
710
if(debug){
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
819
712
}
820
713
821
714
if(quit_now){
822
errno = EINTR;
823
715
goto mandos_end;
824
716
}
825
717
826
/* This casting via intptr_t is to eliminate warning about casting
827
an int to a pointer type. This is exactly how the GnuTLS Guile
828
function "set-session-transport-fd!" does it. */
829
gnutls_transport_set_ptr(session,
830
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
831
719
832
720
if(quit_now){
833
errno = EINTR;
834
721
goto mandos_end;
835
722
}
836
723
837
724
do {
838
725
ret = gnutls_handshake(session);
839
726
if(quit_now){
840
errno = EINTR;
841
727
goto mandos_end;
842
728
}
843
729
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
844
730
845
731
if(ret != GNUTLS_E_SUCCESS){
846
732
if(debug){
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
848
734
gnutls_perror(ret);
849
735
}
850
errno = EPROTO;
851
736
goto mandos_end;
852
737
}
853
738
854
739
/* Read OpenPGP packet that contains the wanted password */
855
740
856
741
if(debug){
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
859
744
}
860
745
861
746
while(true){
862
747
863
748
if(quit_now){
864
errno = EINTR;
865
749
goto mandos_end;
866
750
}
867
751
868
752
buffer_capacity = incbuffer(&buffer, buffer_length,
869
buffer_capacity);
753
buffer_capacity);
870
754
if(buffer_capacity == 0){
871
int e = errno;
872
perror_plus("incbuffer");
873
errno = e;
755
perror("incbuffer");
874
756
goto mandos_end;
875
757
}
876
758
877
759
if(quit_now){
878
errno = EINTR;
879
760
goto mandos_end;
880
761
}
881
762
894
775
ret = gnutls_handshake(session);
895
776
896
777
if(quit_now){
897
errno = EINTR;
898
778
goto mandos_end;
899
779
}
900
780
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
901
781
if(ret < 0){
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
904
783
gnutls_perror(ret);
905
errno = EPROTO;
906
784
goto mandos_end;
907
785
}
908
786
break;
909
787
default:
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
912
790
gnutls_bye(session, GNUTLS_SHUT_RDWR);
913
errno = EIO;
914
791
goto mandos_end;
915
792
}
916
793
} else {
919
796
}
920
797
921
798
if(debug){
922
fprintf_plus(stderr, "Closing TLS session\n");
799
fprintf(stderr, "Closing TLS session\n");
923
800
}
924
801
925
802
if(quit_now){
926
errno = EINTR;
927
803
goto mandos_end;
928
804
}
929
805
930
806
do {
931
807
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
932
808
if(quit_now){
933
errno = EINTR;
934
809
goto mandos_end;
935
810
}
936
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
937
812
938
813
if(buffer_length > 0){
939
814
ssize_t decrypted_buffer_size;
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
941
817
&decrypted_buffer);
942
818
if(decrypted_buffer_size >= 0){
943
819
944
820
written = 0;
945
821
while(written < (size_t) decrypted_buffer_size){
946
822
if(quit_now){
947
errno = EINTR;
948
823
goto mandos_end;
949
824
}
950
825
952
827
(size_t)decrypted_buffer_size - written,
953
828
stdout);
954
829
if(ret == 0 and ferror(stdout)){
955
int e = errno;
956
830
if(debug){
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
959
833
}
960
errno = e;
961
834
goto mandos_end;
962
835
}
963
836
written += (size_t)ret;
969
842
/* Shutdown procedure */
970
843
971
844
mandos_end:
972
{
973
int e = errno;
974
free(decrypted_buffer);
975
free(buffer);
976
if(tcp_sd >= 0){
977
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
978
}
979
if(ret == -1){
980
if(e == 0){
981
e = errno;
982
}
983
perror_plus("close");
984
}
985
gnutls_deinit(session);
986
errno = e;
987
if(quit_now){
988
errno = EINTR;
989
retval = -1;
990
}
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;
991
856
}
992
857
return retval;
993
858
}
1018
883
switch(event){
1019
884
default:
1020
885
case AVAHI_RESOLVER_FAILURE:
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1023
domain,
1024
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)));
1025
889
break;
1026
890
1027
891
case AVAHI_RESOLVER_FOUND:
1029
893
char ip[AVAHI_ADDRESS_STR_MAX];
1030
894
avahi_address_snprint(ip, sizeof(ip), address);
1031
895
if(debug){
1032
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
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);
1035
899
}
1036
900
int ret = start_mandos_communication(ip, port, interface,
1037
901
avahi_proto_to_af(proto));
1038
902
if(ret == 0){
1039
903
avahi_simple_poll_quit(mc.simple_poll);
1040
} else {
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
1046
904
}
1047
905
}
1048
906
}
1072
930
default:
1073
931
case AVAHI_BROWSER_FAILURE:
1074
932
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
1077
935
avahi_simple_poll_quit(mc.simple_poll);
1078
936
return;
1079
937
1086
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
945
name, type, domain, protocol, 0,
1088
946
resolve_callback, NULL) == NULL)
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1090
" %s\n", name,
1091
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)));
1092
949
break;
1093
950
1094
951
case AVAHI_BROWSER_REMOVE:
1097
954
case AVAHI_BROWSER_ALL_FOR_NOW:
1098
955
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1099
956
if(debug){
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1102
958
}
1103
959
break;
1104
960
}
1105
961
}
1106
962
1107
/* Signal handler that stops main loop after SIGTERM */
963
/* stop main loop after sigterm has been called */
1108
964
static void handle_sigterm(int sig){
1109
965
if(quit_now){
1110
966
return;
1112
968
quit_now = 1;
1113
969
signal_received = sig;
1114
970
int old_errno = errno;
1115
/* set main loop to exit */
1116
971
if(mc.simple_poll != NULL){
1117
972
avahi_simple_poll_quit(mc.simple_poll);
1118
973
}
1119
974
errno = old_errno;
1120
975
}
1121
976
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1123
int ret;
1124
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1126
if(s < 0){
1127
perror_plus("socket");
1128
return false;
1129
}
1130
strcpy(ifr->ifr_name, ifname);
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1132
if(ret == -1){
1133
if(debug){
1134
perror_plus("ioctl SIOCGIFFLAGS");
1135
}
1136
return false;
1137
}
1138
return true;
1139
}
1140
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1142
1143
/* Reject the loopback device */
1144
if(ifr->ifr_flags & IFF_LOOPBACK){
1145
if(debug){
1146
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1147
ifname);
1148
}
1149
return false;
1150
}
1151
/* Accept point-to-point devices only if connect_to is specified */
1152
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1153
if(debug){
1154
fprintf_plus(stderr, "Accepting point-to-point interface"
1155
" \"%s\"\n", ifname);
1156
}
1157
return true;
1158
}
1159
/* Otherwise, reject non-broadcast-capable devices */
1160
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1161
if(debug){
1162
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1163
" \"%s\"\n", ifname);
1164
}
1165
return false;
1166
}
1167
/* Reject non-ARP interfaces (including dummy interfaces) */
1168
if(ifr->ifr_flags & IFF_NOARP){
1169
if(debug){
1170
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1171
ifname);
1172
}
1173
return false;
1174
}
1175
1176
/* Accept this device */
1177
if(debug){
1178
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1179
}
1180
return true;
1181
}
1182
1183
/*
1184
* This function determines if a directory entry in /sys/class/net
1185
* corresponds to an acceptable network device.
1186
* (This function is passed to scandir(3) as a filter function.)
1187
*/
1188
int good_interface(const struct dirent *if_entry){
1189
if(if_entry->d_name[0] == '.'){
1190
return 0;
1191
}
1192
1193
struct ifreq ifr;
1194
if(not get_flags(if_entry->d_name, &ifr)){
1195
if(debug){
1196
fprintf_plus(stderr, "Failed to get flags for interface "
1197
"\"%s\"\n", if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
if(not good_flags(if_entry->d_name, &ifr)){
1203
return 0;
1204
}
1205
return 1;
1206
}
1207
1208
/*
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
int notdotentries(const struct dirent *direntry){
1252
/* Skip "." and ".." */
1253
if(direntry->d_name[0] == '.'
1254
and (direntry->d_name[1] == '\0'
1255
or (direntry->d_name[1] == '.'
1256
and direntry->d_name[2] == '\0'))){
1257
return 0;
1258
}
1259
return 1;
1260
}
1261
1262
/* Is this directory entry a runnable program? */
1263
int runnable_hook(const struct dirent *direntry){
1264
int ret;
1265
size_t sret;
1266
struct stat st;
1267
1268
if((direntry->d_name)[0] == '\0'){
1269
/* Empty name? */
1270
return 0;
1271
}
1272
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1274
"abcdefghijklmnopqrstuvwxyz"
1275
"0123456789"
1276
"_-");
1277
if((direntry->d_name)[sret] != '\0'){
1278
/* Contains non-allowed characters */
1279
if(debug){
1280
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1281
direntry->d_name);
1282
}
1283
return 0;
1284
}
1285
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1294
if(ret == -1){
1295
if(debug){
1296
perror_plus("Could not stat hook");
1297
}
1298
return 0;
1299
}
1300
if(not (S_ISREG(st.st_mode))){
1301
/* Not a regular file */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1309
/* Not executable */
1310
if(debug){
1311
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1312
direntry->d_name);
1313
}
1314
return 0;
1315
}
1316
if(debug){
1317
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1318
direntry->d_name);
1319
}
1320
return 1;
1321
}
1322
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1324
int ret;
1325
struct timespec now;
1326
struct timespec waited_time;
1327
intmax_t block_time;
1328
1329
while(true){
1330
if(mc.current_server == NULL){
1331
if (debug){
1332
fprintf_plus(stderr, "Wait until first server is found."
1333
" No timeout!\n");
1334
}
1335
ret = avahi_simple_poll_iterate(s, -1);
1336
} else {
1337
if (debug){
1338
fprintf_plus(stderr, "Check current_server if we should run"
1339
" it, or wait\n");
1340
}
1341
/* the current time */
1342
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1343
if(ret == -1){
1344
perror_plus("clock_gettime");
1345
return -1;
1346
}
1347
/* Calculating in ms how long time between now and server
1348
who we visted longest time ago. Now - last seen. */
1349
waited_time.tv_sec = (now.tv_sec
1350
- mc.current_server->last_seen.tv_sec);
1351
waited_time.tv_nsec = (now.tv_nsec
1352
- mc.current_server->last_seen.tv_nsec);
1353
/* total time is 10s/10,000ms.
1354
Converting to s from ms by dividing by 1,000,
1355
and ns to ms by dividing by 1,000,000. */
1356
block_time = ((retry_interval
1357
- ((intmax_t)waited_time.tv_sec * 1000))
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1359
1360
if (debug){
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1362
block_time);
1363
}
1364
1365
if(block_time <= 0){
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1370
if(ret == 0){
1371
avahi_simple_poll_quit(mc.simple_poll);
1372
return 0;
1373
}
1374
ret = clock_gettime(CLOCK_MONOTONIC,
1375
&mc.current_server->last_seen);
1376
if(ret == -1){
1377
perror_plus("clock_gettime");
1378
return -1;
1379
}
1380
mc.current_server = mc.current_server->next;
1381
block_time = 0; /* Call avahi to find new Mandos
1382
servers, but don't block */
1383
}
1384
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
}
1387
if(ret != 0){
1388
if (ret > 0 or errno != EINTR){
1389
return (ret != 1) ? ret : 0;
1390
}
1391
}
1392
}
1393
}
1394
1395
/* Set effective uid to 0, return errno */
1396
error_t raise_privileges(void){
1397
error_t old_errno = errno;
1398
error_t ret_errno = 0;
1399
if(seteuid(0) == -1){
1400
ret_errno = errno;
1401
perror_plus("seteuid");
1402
}
1403
errno = old_errno;
1404
return ret_errno;
1405
}
1406
1407
/* Set effective and real user ID to 0. Return errno. */
1408
error_t raise_privileges_permanently(void){
1409
error_t old_errno = errno;
1410
error_t ret_errno = raise_privileges();
1411
if(ret_errno != 0){
1412
errno = old_errno;
1413
return ret_errno;
1414
}
1415
if(setuid(0) == -1){
1416
ret_errno = errno;
1417
perror_plus("seteuid");
1418
}
1419
errno = old_errno;
1420
return ret_errno;
1421
}
1422
1423
/* Set effective user ID to unprivileged saved user ID */
1424
error_t lower_privileges(void){
1425
error_t old_errno = errno;
1426
error_t ret_errno = 0;
1427
if(seteuid(uid) == -1){
1428
ret_errno = errno;
1429
perror_plus("seteuid");
1430
}
1431
errno = old_errno;
1432
return ret_errno;
1433
}
1434
1435
bool run_network_hooks(const char *mode, const char *interface,
1436
const float delay){
1437
struct dirent **direntries;
1438
struct dirent *direntry;
1439
int ret;
1440
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1441
alphasort);
1442
if(numhooks == -1){
1443
perror_plus("scandir");
1444
} else {
1445
int devnull = open("/dev/null", O_RDONLY);
1446
for(int i = 0; i < numhooks; i++){
1447
direntry = direntries[i];
1448
char *fullname = NULL;
1449
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1450
if(ret < 0){
1451
perror_plus("asprintf");
1452
continue;
1453
}
1454
if(debug){
1455
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1456
direntry->d_name);
1457
}
1458
pid_t hook_pid = fork();
1459
if(hook_pid == 0){
1460
/* Child */
1461
/* Raise privileges */
1462
raise_privileges_permanently();
1463
/* Set group */
1464
errno = 0;
1465
ret = setgid(0);
1466
if(ret == -1){
1467
perror_plus("setgid");
1468
}
1469
/* Reset supplementary groups */
1470
errno = 0;
1471
ret = setgroups(0, NULL);
1472
if(ret == -1){
1473
perror_plus("setgroups");
1474
}
1475
dup2(devnull, STDIN_FILENO);
1476
close(devnull);
1477
dup2(STDERR_FILENO, STDOUT_FILENO);
1478
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1479
if(ret == -1){
1480
perror_plus("setenv");
1481
_exit(EX_OSERR);
1482
}
1483
ret = setenv("DEVICE", interface, 1);
1484
if(ret == -1){
1485
perror_plus("setenv");
1486
_exit(EX_OSERR);
1487
}
1488
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("MODE", mode, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
char *delaystring;
1499
ret = asprintf(&delaystring, "%f", delay);
1500
if(ret == -1){
1501
perror_plus("asprintf");
1502
_exit(EX_OSERR);
1503
}
1504
ret = setenv("DELAY", delaystring, 1);
1505
if(ret == -1){
1506
free(delaystring);
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
free(delaystring);
1511
if(connect_to != NULL){
1512
ret = setenv("CONNECT", connect_to, 1);
1513
if(ret == -1){
1514
perror_plus("setenv");
1515
_exit(EX_OSERR);
1516
}
1517
}
1518
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1519
perror_plus("execl");
1520
_exit(EXIT_FAILURE);
1521
}
1522
} else {
1523
int status;
1524
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1525
perror_plus("waitpid");
1526
free(fullname);
1527
continue;
1528
}
1529
if(WIFEXITED(status)){
1530
if(WEXITSTATUS(status) != 0){
1531
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1532
" with status %d\n", direntry->d_name,
1533
WEXITSTATUS(status));
1534
free(fullname);
1535
continue;
1536
}
1537
} else if(WIFSIGNALED(status)){
1538
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1539
" signal %d\n", direntry->d_name,
1540
WTERMSIG(status));
1541
free(fullname);
1542
continue;
1543
} else {
1544
fprintf_plus(stderr, "Warning: network hook \"%s\""
1545
" crashed\n", direntry->d_name);
1546
free(fullname);
1547
continue;
1548
}
1549
}
1550
free(fullname);
1551
if(debug){
1552
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1553
direntry->d_name);
1554
}
1555
}
1556
close(devnull);
1557
}
1558
return true;
1559
}
1560
1561
int bring_up_interface(const char *const interface,
1562
const float delay){
1563
int sd = -1;
1564
int old_errno = errno;
1565
int ret_errno = 0;
1566
int ret;
1567
struct ifreq network;
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1569
if(if_index == 0){
1570
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1571
errno = old_errno;
1572
return ENXIO;
1573
}
1574
1575
if(quit_now){
1576
errno = old_errno;
1577
return EINTR;
1578
}
1579
1580
/* Re-raise priviliges */
1581
raise_privileges();
1582
1583
#ifdef __linux__
1584
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1585
messages about the network interface to mess up the prompt */
1586
ret = klogctl(8, NULL, 5);
1587
bool restore_loglevel = true;
1588
if(ret == -1){
1589
restore_loglevel = false;
1590
perror_plus("klogctl");
1591
}
1592
#endif /* __linux__ */
1593
1594
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1595
if(sd < 0){
1596
ret_errno = errno;
1597
perror_plus("socket");
1598
#ifdef __linux__
1599
if(restore_loglevel){
1600
ret = klogctl(7, NULL, 0);
1601
if(ret == -1){
1602
perror_plus("klogctl");
1603
}
1604
}
1605
#endif /* __linux__ */
1606
/* Lower privileges */
1607
lower_privileges();
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
strcpy(network.ifr_name, interface);
1612
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1613
if(ret == -1){
1614
ret_errno = errno;
1615
perror_plus("ioctl SIOCGIFFLAGS");
1616
#ifdef __linux__
1617
if(restore_loglevel){
1618
ret = klogctl(7, NULL, 0);
1619
if(ret == -1){
1620
perror_plus("klogctl");
1621
}
1622
}
1623
#endif /* __linux__ */
1624
/* Lower privileges */
1625
lower_privileges();
1626
errno = old_errno;
1627
return ret_errno;
1628
}
1629
if((network.ifr_flags & IFF_UP) == 0){
1630
network.ifr_flags |= IFF_UP;
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1632
if(ret == -1){
1633
ret_errno = errno;
1634
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1635
#ifdef __linux__
1636
if(restore_loglevel){
1637
ret = klogctl(7, NULL, 0);
1638
if(ret == -1){
1639
perror_plus("klogctl");
1640
}
1641
}
1642
#endif /* __linux__ */
1643
/* Lower privileges */
1644
lower_privileges();
1645
errno = old_errno;
1646
return ret_errno;
1647
}
1648
}
1649
/* Sleep checking until interface is running.
1650
Check every 0.25s, up to total time of delay */
1651
for(int i=0; i < delay * 4; i++){
1652
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1653
if(ret == -1){
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
} else if(network.ifr_flags & IFF_RUNNING){
1656
break;
1657
}
1658
struct timespec sleeptime = { .tv_nsec = 250000000 };
1659
ret = nanosleep(&sleeptime, NULL);
1660
if(ret == -1 and errno != EINTR){
1661
perror_plus("nanosleep");
1662
}
1663
}
1664
/* Close the socket */
1665
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1666
if(ret == -1){
1667
perror_plus("close");
1668
}
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1673
if(ret == -1){
1674
perror_plus("klogctl");
1675
}
1676
}
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
lower_privileges();
1680
errno = old_errno;
1681
return 0;
1682
}
1683
1684
977
int main(int argc, char *argv[]){
1685
978
AvahiSServiceBrowser *sb = NULL;
1686
979
int error;
1688
981
intmax_t tmpmax;
1689
982
char *tmp;
1690
983
int exitcode = EXIT_SUCCESS;
1691
const char *interface = "";
984
const char *interface = "eth0";
1692
985
struct ifreq network;
1693
986
int sd = -1;
1694
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
1695
991
char tempdir[] = "/tmp/mandosXXXXXX";
1696
992
bool tempdir_created = false;
1697
993
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1701
997
bool gnutls_initialized = false;
1702
998
bool gpgme_initialized = false;
1703
999
float delay = 2.5f;
1704
double retry_interval = 10; /* 10s between trying a server and
1705
retrying the same server again */
1706
1000
1707
1001
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1708
1002
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1714
1008
errno = 0;
1715
1009
ret = setgid(gid);
1716
1010
if(ret == -1){
1717
perror_plus("setgid");
1011
perror("setgid");
1718
1012
}
1719
1013
1720
1014
/* Lower user privileges (temporarily) */
1721
1015
errno = 0;
1722
1016
ret = seteuid(uid);
1723
1017
if(ret == -1){
1724
perror_plus("seteuid");
1018
perror("seteuid");
1725
1019
}
1726
1020
1727
1021
if(quit_now){
1762
1056
.arg = "SECONDS",
1763
1057
.doc = "Maximum delay to wait for interface startup",
1764
1058
.group = 2 },
1765
{ .name = "retry", .key = 132,
1766
.arg = "SECONDS",
1767
.doc = "Retry interval used when denied by the Mandos server",
1768
.group = 2 },
1769
{ .name = "network-hook-dir", .key = 133,
1770
.arg = "DIR",
1771
.doc = "Directory where network hooks are located",
1772
.group = 2 },
1773
/*
1774
* These reproduce what we would get without ARGP_NO_HELP
1775
*/
1776
{ .name = "help", .key = '?',
1777
.doc = "Give this help list", .group = -1 },
1778
{ .name = "usage", .key = -3,
1779
.doc = "Give a short usage message", .group = -1 },
1780
{ .name = "version", .key = 'V',
1781
.doc = "Print program version", .group = -1 },
1782
1059
{ .name = NULL }
1783
1060
};
1784
1061
1785
1062
error_t parse_opt(int key, char *arg,
1786
1063
struct argp_state *state){
1787
errno = 0;
1788
1064
switch(key){
1789
1065
case 128: /* --debug */
1790
1066
debug = true;
1806
1082
tmpmax = strtoimax(arg, &tmp, 10);
1807
1083
if(errno != 0 or tmp == arg or *tmp != '\0'
1808
1084
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1809
argp_error(state, "Bad number of DH bits");
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
1810
1087
}
1811
1088
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1812
1089
break;
1817
1094
errno = 0;
1818
1095
delay = strtof(arg, &tmp);
1819
1096
if(errno != 0 or tmp == arg or *tmp != '\0'){
1820
argp_error(state, "Bad delay");
1821
}
1822
case 132: /* --retry */
1823
errno = 0;
1824
retry_interval = strtod(arg, &tmp);
1825
if(errno != 0 or tmp == arg or *tmp != '\0'
1826
or (retry_interval * 1000) > INT_MAX
1827
or retry_interval < 0){
1828
argp_error(state, "Bad retry interval");
1829
}
1830
break;
1831
case 133: /* --network-hook-dir */
1832
hookdir = arg;
1833
break;
1834
/*
1835
* These reproduce what we would get without ARGP_NO_HELP
1836
*/
1837
case '?': /* --help */
1838
argp_state_help(state, state->out_stream,
1839
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1840
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1841
case -3: /* --usage */
1842
argp_state_help(state, state->out_stream,
1843
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1844
case 'V': /* --version */
1845
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1846
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:
1847
1104
break;
1848
1105
default:
1849
1106
return ARGP_ERR_UNKNOWN;
1850
1107
}
1851
return errno;
1108
return 0;
1852
1109
}
1853
1110
1854
1111
struct argp argp = { .options = options, .parser = parse_opt,
1855
1112
.args_doc = "",
1856
1113
.doc = "Mandos client -- Get and decrypt"
1857
1114
" passwords from a Mandos server" };
1858
ret = argp_parse(&argp, argc, argv,
1859
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1860
switch(ret){
1861
case 0:
1862
break;
1863
case ENOMEM:
1864
default:
1865
errno = ret;
1866
perror_plus("argp_parse");
1867
exitcode = EX_OSERR;
1868
goto end;
1869
case EINVAL:
1870
exitcode = EX_USAGE;
1871
goto end;
1872
}
1873
}
1874
1875
{
1876
/* Work around Debian bug #633582:
1877
<http://bugs.debian.org/633582> */
1878
1879
/* Re-raise priviliges */
1880
if(raise_privileges() == 0){
1881
struct stat st;
1882
1883
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1884
int seckey_fd = open(seckey, O_RDONLY);
1885
if(seckey_fd == -1){
1886
perror_plus("open");
1887
} else {
1888
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1889
if(ret == -1){
1890
perror_plus("fstat");
1891
} else {
1892
if(S_ISREG(st.st_mode)
1893
and st.st_uid == 0 and st.st_gid == 0){
1894
ret = fchown(seckey_fd, uid, gid);
1895
if(ret == -1){
1896
perror_plus("fchown");
1897
}
1898
}
1899
}
1900
TEMP_FAILURE_RETRY(close(seckey_fd));
1901
}
1902
}
1903
1904
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1905
int pubkey_fd = open(pubkey, O_RDONLY);
1906
if(pubkey_fd == -1){
1907
perror_plus("open");
1908
} else {
1909
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1910
if(ret == -1){
1911
perror_plus("fstat");
1912
} else {
1913
if(S_ISREG(st.st_mode)
1914
and st.st_uid == 0 and st.st_gid == 0){
1915
ret = fchown(pubkey_fd, uid, gid);
1916
if(ret == -1){
1917
perror_plus("fchown");
1918
}
1919
}
1920
}
1921
TEMP_FAILURE_RETRY(close(pubkey_fd));
1922
}
1923
}
1924
1925
/* Lower privileges */
1926
errno = 0;
1927
ret = seteuid(uid);
1928
if(ret == -1){
1929
perror_plus("seteuid");
1930
}
1931
}
1932
}
1933
1934
/* Run network hooks */
1935
if(not run_network_hooks("start", interface, delay)){
1936
goto end;
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;
1120
}
1937
1121
}
1938
1122
1939
1123
if(not debug){
1940
1124
avahi_set_log_function(empty_log);
1941
1125
}
1942
1126
1943
if(interface[0] == '\0'){
1944
struct dirent **direntries;
1945
/* First look for interfaces that are up */
1946
ret = scandir(sys_class_net, &direntries, up_interface,
1947
alphasort);
1948
if(ret == 0){
1949
/* No up interfaces, look for any good interfaces */
1950
free(direntries);
1951
ret = scandir(sys_class_net, &direntries, good_interface,
1952
alphasort);
1953
}
1954
if(ret >= 1){
1955
/* Pick the first interface returned */
1956
interface = strdup(direntries[0]->d_name);
1957
if(debug){
1958
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1959
}
1960
if(interface == NULL){
1961
perror_plus("malloc");
1962
free(direntries);
1963
exitcode = EXIT_FAILURE;
1964
goto end;
1965
}
1966
free(direntries);
1967
} else {
1968
free(direntries);
1969
fprintf_plus(stderr, "Could not find a network interface\n");
1970
exitcode = EXIT_FAILURE;
1971
goto end;
1972
}
1973
}
1974
1975
1127
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1976
1128
from the signal handler */
1977
1129
/* Initialize the pseudo-RNG for Avahi */
1978
1130
srand((unsigned int) time(NULL));
1979
1131
mc.simple_poll = avahi_simple_poll_new();
1980
1132
if(mc.simple_poll == NULL){
1981
fprintf_plus(stderr,
1982
"Avahi: Failed to create simple poll object.\n");
1983
exitcode = EX_UNAVAILABLE;
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
1984
1135
goto end;
1985
1136
}
1986
1137
1987
1138
sigemptyset(&sigterm_action.sa_mask);
1988
1139
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1989
1140
if(ret == -1){
1990
perror_plus("sigaddset");
1991
exitcode = EX_OSERR;
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
1992
1143
goto end;
1993
1144
}
1994
1145
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1995
1146
if(ret == -1){
1996
perror_plus("sigaddset");
1997
exitcode = EX_OSERR;
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
1998
1149
goto end;
1999
1150
}
2000
1151
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2001
1152
if(ret == -1){
2002
perror_plus("sigaddset");
2003
exitcode = EX_OSERR;
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
2004
1155
goto end;
2005
1156
}
2006
1157
/* Need to check if the handler is SIG_IGN before handling:
2009
1160
*/
2010
1161
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2011
1162
if(ret == -1){
2012
perror_plus("sigaction");
2013
return EX_OSERR;
1163
perror("sigaction");
1164
return EXIT_FAILURE;
2014
1165
}
2015
1166
if(old_sigterm_action.sa_handler != SIG_IGN){
2016
1167
ret = sigaction(SIGINT, &sigterm_action, NULL);
2017
1168
if(ret == -1){
2018
perror_plus("sigaction");
2019
exitcode = EX_OSERR;
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
2020
1171
goto end;
2021
1172
}
2022
1173
}
2023
1174
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2024
1175
if(ret == -1){
2025
perror_plus("sigaction");
2026
return EX_OSERR;
1176
perror("sigaction");
1177
return EXIT_FAILURE;
2027
1178
}
2028
1179
if(old_sigterm_action.sa_handler != SIG_IGN){
2029
1180
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2030
1181
if(ret == -1){
2031
perror_plus("sigaction");
2032
exitcode = EX_OSERR;
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
2033
1184
goto end;
2034
1185
}
2035
1186
}
2036
1187
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2037
1188
if(ret == -1){
2038
perror_plus("sigaction");
2039
return EX_OSERR;
1189
perror("sigaction");
1190
return EXIT_FAILURE;
2040
1191
}
2041
1192
if(old_sigterm_action.sa_handler != SIG_IGN){
2042
1193
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2043
1194
if(ret == -1){
2044
perror_plus("sigaction");
2045
exitcode = EX_OSERR;
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
2046
1197
goto end;
2047
1198
}
2048
1199
}
2049
1200
2050
1201
/* If the interface is down, bring it up */
2051
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2052
ret = bring_up_interface(interface, delay);
2053
if(ret != 0){
2054
errno = ret;
2055
perror_plus("Failed to bring up interface");
1202
if(interface[0] != '\0'){
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1204
if(if_index == 0){
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
1221
#ifdef __linux__
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
messages to mess up the prompt */
1224
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
if(ret == -1){
1227
restore_loglevel = false;
1228
perror("klogctl");
1229
}
1230
#endif /* __linux__ */
1231
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
if(sd < 0){
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1236
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1250
goto end;
1251
}
1252
strcpy(network.ifr_name, interface);
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1254
if(ret == -1){
1255
perror("ioctl SIOCGIFFLAGS");
1256
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
1262
}
1263
#endif /* __linux__ */
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
goto end;
1272
}
1273
if((network.ifr_flags & IFF_UP) == 0){
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
if(ret == -1){
1278
take_down_interface = false;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1281
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
1286
}
1287
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1295
goto end;
1296
}
1297
}
1298
/* sleep checking until interface is running */
1299
for(int i=0; i < delay * 4; i++){
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1301
if(ret == -1){
1302
perror("ioctl SIOCGIFFLAGS");
1303
} else if(network.ifr_flags & IFF_RUNNING){
1304
break;
1305
}
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1307
ret = nanosleep(&sleeptime, NULL);
1308
if(ret == -1 and errno != EINTR){
1309
perror("nanosleep");
1310
}
1311
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1318
}
1319
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
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
}
2056
1342
}
2057
1343
}
2058
1344
2062
1348
2063
1349
ret = init_gnutls_global(pubkey, seckey);
2064
1350
if(ret == -1){
2065
fprintf_plus(stderr, "init_gnutls_global failed\n");
2066
exitcode = EX_UNAVAILABLE;
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2067
1353
goto end;
2068
1354
} else {
2069
1355
gnutls_initialized = true;
2073
1359
goto end;
2074
1360
}
2075
1361
1362
tempdir_created = true;
2076
1363
if(mkdtemp(tempdir) == NULL){
2077
perror_plus("mkdtemp");
1364
tempdir_created = false;
1365
perror("mkdtemp");
2078
1366
goto end;
2079
1367
}
2080
tempdir_created = true;
2081
1368
2082
1369
if(quit_now){
2083
1370
goto end;
2084
1371
}
2085
1372
2086
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
2087
fprintf_plus(stderr, "init_gpgme failed\n");
2088
exitcode = EX_UNAVAILABLE;
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2089
1376
goto end;
2090
1377
} else {
2091
1378
gpgme_initialized = true;
2099
1386
/* Connect directly, do not use Zeroconf */
2100
1387
/* (Mainly meant for debugging) */
2101
1388
char *address = strrchr(connect_to, ':');
2102
2103
1389
if(address == NULL){
2104
fprintf_plus(stderr, "No colon in address\n");
2105
exitcode = EX_USAGE;
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2106
1392
goto end;
2107
1393
}
2108
1394
2115
1401
tmpmax = strtoimax(address+1, &tmp, 10);
2116
1402
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2117
1403
or tmpmax != (uint16_t)tmpmax){
2118
fprintf_plus(stderr, "Bad port number\n");
2119
exitcode = EX_USAGE;
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2120
1406
goto end;
2121
1407
}
2122
1408
2126
1412
2127
1413
port = (uint16_t)tmpmax;
2128
1414
*address = '\0';
1415
address = connect_to;
2129
1416
/* Colon in address indicates IPv6 */
2130
1417
int af;
2131
if(strchr(connect_to, ':') != NULL){
1418
if(strchr(address, ':') != NULL){
2132
1419
af = AF_INET6;
2133
/* Accept [] around IPv6 address - see RFC 5952 */
2134
if(connect_to[0] == '[' and address[-1] == ']')
2135
{
2136
connect_to++;
2137
address[-1] = '\0';
2138
}
2139
1420
} else {
2140
1421
af = AF_INET;
2141
1422
}
2142
address = connect_to;
2143
1423
2144
1424
if(quit_now){
2145
1425
goto end;
2146
1426
}
2147
1427
2148
while(not quit_now){
2149
ret = start_mandos_communication(address, port, if_index, af);
2150
if(quit_now or ret == 0){
2151
break;
2152
}
2153
if(debug){
2154
fprintf_plus(stderr, "Retrying in %d seconds\n",
2155
(int)retry_interval);
2156
}
2157
sleep((int)retry_interval);
2158
}
2159
2160
if (not quit_now){
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2161
1432
exitcode = EXIT_SUCCESS;
2162
1433
}
2163
2164
1434
goto end;
2165
1435
}
2166
1436
2188
1458
2189
1459
/* Check if creating the Avahi server object succeeded */
2190
1460
if(mc.server == NULL){
2191
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2192
avahi_strerror(error));
2193
exitcode = EX_UNAVAILABLE;
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
2194
1464
goto end;
2195
1465
}
2196
1466
2203
1473
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2204
1474
NULL, 0, browse_callback, NULL);
2205
1475
if(sb == NULL){
2206
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2207
avahi_strerror(avahi_server_errno(mc.server)));
2208
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;
2209
1479
goto end;
2210
1480
}
2211
1481
2216
1486
/* Run the main loop */
2217
1487
2218
1488
if(debug){
2219
fprintf_plus(stderr, "Starting Avahi loop search\n");
2220
}
2221
2222
ret = avahi_loop_with_timeout(mc.simple_poll,
2223
(int)(retry_interval * 1000));
2224
if(debug){
2225
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2226
(ret == 0) ? "successfully" : "with error");
2227
}
1489
fprintf(stderr, "Starting Avahi loop search\n");
1490
}
1491
1492
avahi_simple_poll_loop(mc.simple_poll);
2228
1493
2229
1494
end:
2230
1495
2231
1496
if(debug){
2232
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1497
fprintf(stderr, "%s exiting\n", argv[0]);
2233
1498
}
2234
1499
2235
1500
/* Cleanup things */
2252
1517
gpgme_release(mc.ctx);
2253
1518
}
2254
1519
2255
/* Cleans up the circular linked list of Mandos servers the client
2256
has seen */
2257
if(mc.current_server != NULL){
2258
mc.current_server->prev->next = NULL;
2259
while(mc.current_server != NULL){
2260
server *next = mc.current_server->next;
2261
free(mc.current_server);
2262
mc.current_server = next;
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
2263
1527
}
2264
}
2265
2266
/* Run network hooks */
2267
run_network_hooks("stop", interface, delay);
2268
2269
/* Re-raise priviliges */
2270
{
2271
raise_privileges();
2272
2273
/* Take down the network interface */
2274
if(take_down_interface and geteuid() == 0){
1528
if(geteuid() == 0){
2275
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2276
1530
if(ret == -1){
2277
perror_plus("ioctl SIOCGIFFLAGS");
2278
} else if(network.ifr_flags & IFF_UP){
2279
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 */
2280
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2281
1535
if(ret == -1){
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1536
perror("ioctl SIOCSIFFLAGS");
2283
1537
}
2284
1538
}
2285
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2286
1540
if(ret == -1){
2287
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");
2288
1548
}
2289
1549
}
2290
1550
}
2291
/* Lower privileges permanently */
2292
errno = 0;
2293
ret = setuid(uid);
2294
if(ret == -1){
2295
perror_plus("setuid");
2296
}
2297
1551
2298
/* Removes the GPGME temp directory and all files inside */
1552
/* Removes the temp directory used by GPGME */
2299
1553
if(tempdir_created){
2300
struct dirent **direntries = NULL;
2301
struct dirent *direntry = NULL;
2302
int numentries = scandir(tempdir, &direntries, notdotentries,
2303
alphasort);
2304
if (numentries > 0){
2305
for(int i = 0; i < numentries; i++){
2306
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
}
2307
1574
char *fullname = NULL;
2308
1575
ret = asprintf(&fullname, "%s/%s", tempdir,
2309
1576
direntry->d_name);
2310
1577
if(ret < 0){
2311
perror_plus("asprintf");
1578
perror("asprintf");
2312
1579
continue;
2313
1580
}
2314
1581
ret = remove(fullname);
2315
1582
if(ret == -1){
2316
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2317
strerror(errno));
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
2318
1585
}
2319
1586
free(fullname);
2320
1587
}
2321
}
2322
2323
/* need to clean even if 0 because man page doesn't specify */
2324
free(direntries);
2325
if (numentries == -1){
2326
perror_plus("scandir");
1588
closedir(d);
2327
1589
}
2328
1590
ret = rmdir(tempdir);
2329
1591
if(ret == -1 and errno != ENOENT){
2330
perror_plus("rmdir");
1592
perror("rmdir");
2331
1593
}
2332
1594
}
2333
1595
2338
1600
&old_sigterm_action,
2339
1601
NULL));
2340
1602
if(ret == -1){
2341
perror_plus("sigaction");
1603
perror("sigaction");
2342
1604
}
2343
1605
do {
2344
1606
ret = raise(signal_received);
2345
1607
} while(ret != 0 and errno == EINTR);
2346
1608
if(ret != 0){
2347
perror_plus("raise");
1609
perror("raise");
2348
1610
abort();
2349
1611
}
2350
1612
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0