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- Committer: Teddy Hogeborn
- Date: 2012-06-09 23:41:07 UTC
- mto: This revision was merged to the branch mainline in revision 596.
- Revision ID: teddy@recompile.se-20120609234107-vm6zilzz0y6aihsm
* plugins.d/mandos-client.c (raise_privileges,
raise_privileges_permanently, lower_privileges): Return error_t and
save old errno
before calling any
other function.
raise_privileges_permanently, lower_privileges): Return error_t and
save old errno
before calling any
other function.
- files added:
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
87
91
88
92
#ifdef __linux__
89
93
#include <sys/klog.h> /* klogctl() */
107
111
init_gnutls_session(),
108
112
GNUTLS_* */
109
113
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
112
116
113
117
/* GPGME */
114
118
#include <gpgme.h> /* All GPGME types, constants and
122
126
#define PATHDIR "/conf/conf.d/mandos"
123
127
#define SECKEY "seckey.txt"
124
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
130
126
131
bool debug = false;
127
132
static const char mandos_protocol_version[] = "1";
128
133
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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;
130
151
131
152
/* Used for passing in values through the Avahi callback functions */
132
153
typedef struct {
137
158
gnutls_dh_params_t dh_params;
138
159
const char *priority;
139
160
gpgme_ctx_t ctx;
161
server *current_server;
140
162
} mandos_context;
141
163
142
164
/* global context so signal handler can reach it*/
143
165
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
166
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
146
169
147
170
sig_atomic_t quit_now = 0;
148
171
int signal_received = 0;
149
172
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
150
192
/*
151
193
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
194
* bytes. "buffer_capacity" is how much is currently allocated,
153
195
* "buffer_length" is how much is already used.
154
196
*/
155
197
size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
198
size_t buffer_capacity){
157
199
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
200
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
201
if(buffer == NULL){
164
206
return buffer_capacity;
165
207
}
166
208
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
167
246
/*
168
247
* Initialize GPGME.
169
248
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
172
251
gpgme_error_t rc;
173
252
gpgme_engine_info_t engine_info;
174
253
183
262
184
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
264
if(fd == -1){
186
perror("open");
265
perror_plus("open");
187
266
return false;
188
267
}
189
268
190
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
270
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
194
273
return false;
195
274
}
196
275
197
276
rc = gpgme_op_import(mc.ctx, pgp_data);
198
277
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
201
280
return false;
202
281
}
203
282
204
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
284
if(ret == -1){
206
perror("close");
285
perror_plus("close");
207
286
}
208
287
gpgme_data_release(pgp_data);
209
288
return true;
210
289
}
211
290
212
291
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
292
fprintf_plus(stderr, "Initializing GPGME\n");
214
293
}
215
294
216
295
/* Init GPGME */
217
296
gpgme_check_version(NULL);
218
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
298
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
222
301
return false;
223
302
}
224
303
225
/* Set GPGME home directory for the OpenPGP engine only */
304
/* Set GPGME home directory for the OpenPGP engine only */
226
305
rc = gpgme_get_engine_info(&engine_info);
227
306
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
230
309
return false;
231
310
}
232
311
while(engine_info != NULL){
238
317
engine_info = engine_info->next;
239
318
}
240
319
if(engine_info == NULL){
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
242
322
return false;
243
323
}
244
324
245
325
/* Create new GPGME "context" */
246
326
rc = gpgme_new(&(mc.ctx));
247
327
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
250
331
return false;
251
332
}
252
333
271
352
ssize_t plaintext_length = 0;
272
353
273
354
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
275
356
}
276
357
277
358
/* Create new GPGME data buffer from memory cryptotext */
278
359
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
360
0);
280
361
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
362
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
283
364
return -1;
284
365
}
285
366
286
367
/* Create new empty GPGME data buffer for the plaintext */
287
368
rc = gpgme_data_new(&dh_plain);
288
369
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
291
373
gpgme_data_release(dh_crypto);
292
374
return -1;
293
375
}
296
378
data buffer */
297
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
298
380
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
301
383
plaintext_length = -1;
302
384
if(debug){
303
385
gpgme_decrypt_result_t result;
304
386
result = gpgme_op_decrypt_result(mc.ctx);
305
387
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
389
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
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);
312
394
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
396
}
315
397
gpgme_recipient_t recipient;
316
398
recipient = result->recipients;
317
399
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
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");
324
407
recipient = recipient->next;
325
408
}
326
409
}
329
412
}
330
413
331
414
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
333
416
}
334
417
335
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
420
perror_plus("gpgme_data_seek");
338
421
plaintext_length = -1;
339
422
goto decrypt_end;
340
423
}
342
425
*plaintext = NULL;
343
426
while(true){
344
427
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
428
(size_t)plaintext_length,
429
plaintext_capacity);
347
430
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
351
434
}
352
435
353
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
441
break;
359
442
}
360
443
if(ret < 0){
361
perror("gpgme_data_read");
444
perror_plus("gpgme_data_read");
362
445
plaintext_length = -1;
363
446
goto decrypt_end;
364
447
}
366
449
}
367
450
368
451
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
452
fprintf_plus(stderr, "Decrypted password is: ");
370
453
for(ssize_t i = 0; i < plaintext_length; i++){
371
454
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
455
}
394
477
/* GnuTLS log function callback */
395
478
static void debuggnutls(__attribute__((unused)) int level,
396
479
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
398
481
}
399
482
400
483
static int init_gnutls_global(const char *pubkeyfilename,
402
485
int ret;
403
486
404
487
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
406
489
}
407
490
408
491
ret = gnutls_global_init();
409
492
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
412
495
return -1;
413
496
}
414
497
421
504
}
422
505
423
506
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
425
508
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
431
511
gnutls_global_deinit();
432
512
return -1;
433
513
}
434
514
435
515
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
439
520
}
440
521
441
522
ret = gnutls_certificate_set_openpgp_key_file
442
523
(mc.cred, pubkeyfilename, seckeyfilename,
443
524
GNUTLS_OPENPGP_FMT_BASE64);
444
525
if(ret != GNUTLS_E_SUCCESS){
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
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));
450
531
goto globalfail;
451
532
}
452
533
453
534
/* GnuTLS server initialization */
454
535
ret = gnutls_dh_params_init(&mc.dh_params);
455
536
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
458
540
goto globalfail;
459
541
}
460
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
543
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
464
546
goto globalfail;
465
547
}
466
548
486
568
}
487
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
570
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
491
574
}
492
575
493
576
{
500
583
}
501
584
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
585
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
506
589
gnutls_deinit(*session);
507
590
return -1;
508
591
}
517
600
}
518
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
602
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
522
605
gnutls_deinit(*session);
523
606
return -1;
524
607
}
569
652
pf = PF_INET;
570
653
break;
571
654
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
573
656
errno = EINVAL;
574
657
return -1;
575
658
}
580
663
}
581
664
582
665
if(debug){
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
585
668
}
586
669
587
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
671
if(tcp_sd < 0){
589
672
int e = errno;
590
perror("socket");
673
perror_plus("socket");
591
674
errno = e;
592
675
goto mandos_end;
593
676
}
607
690
}
608
691
if(ret < 0 ){
609
692
int e = errno;
610
perror("inet_pton");
693
perror_plus("inet_pton");
611
694
errno = e;
612
695
goto mandos_end;
613
696
}
614
697
if(ret == 0){
615
698
int e = errno;
616
fprintf(stderr, "Bad address: %s\n", ip);
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
617
700
errno = e;
618
701
goto mandos_end;
619
702
}
624
707
625
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
710
-Wunreachable-code*/
628
711
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
712
fprintf_plus(stderr, "An IPv6 link-local address is"
713
" incomplete without a network interface\n");
631
714
errno = EINVAL;
632
715
goto mandos_end;
633
716
}
649
732
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
733
char interface[IF_NAMESIZE];
651
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
735
perror_plus("if_indextoname");
653
736
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
656
739
}
657
740
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
660
743
}
661
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
669
752
sizeof(addrstr));
670
753
}
671
754
if(pcret == NULL){
672
perror("inet_ntop");
755
perror_plus("inet_ntop");
673
756
} else {
674
757
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
676
759
}
677
760
}
678
761
}
688
771
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
772
}
690
773
if(ret < 0){
691
int e = errno;
692
perror("connect");
693
errno = e;
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
int e = errno;
776
perror_plus("connect");
777
errno = e;
778
}
694
779
goto mandos_end;
695
780
}
696
781
704
789
while(true){
705
790
size_t out_size = strlen(out);
706
791
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
out_size - written));
792
out_size - written));
708
793
if(ret == -1){
709
794
int e = errno;
710
perror("write");
795
perror_plus("write");
711
796
errno = e;
712
797
goto mandos_end;
713
798
}
730
815
}
731
816
732
817
if(debug){
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
734
819
}
735
820
736
821
if(quit_now){
738
823
goto mandos_end;
739
824
}
740
825
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
742
831
743
832
if(quit_now){
744
833
errno = EINTR;
755
844
756
845
if(ret != GNUTLS_E_SUCCESS){
757
846
if(debug){
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
759
848
gnutls_perror(ret);
760
849
}
761
850
errno = EPROTO;
765
854
/* Read OpenPGP packet that contains the wanted password */
766
855
767
856
if(debug){
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
770
859
}
771
860
772
861
while(true){
777
866
}
778
867
779
868
buffer_capacity = incbuffer(&buffer, buffer_length,
780
buffer_capacity);
869
buffer_capacity);
781
870
if(buffer_capacity == 0){
782
871
int e = errno;
783
perror("incbuffer");
872
perror_plus("incbuffer");
784
873
errno = e;
785
874
goto mandos_end;
786
875
}
810
899
}
811
900
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
901
if(ret < 0){
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
814
904
gnutls_perror(ret);
815
905
errno = EPROTO;
816
906
goto mandos_end;
817
907
}
818
908
break;
819
909
default:
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
822
912
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
913
errno = EIO;
824
914
goto mandos_end;
829
919
}
830
920
831
921
if(debug){
832
fprintf(stderr, "Closing TLS session\n");
922
fprintf_plus(stderr, "Closing TLS session\n");
833
923
}
834
924
835
925
if(quit_now){
847
937
848
938
if(buffer_length > 0){
849
939
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
852
941
&decrypted_buffer);
853
942
if(decrypted_buffer_size >= 0){
854
943
865
954
if(ret == 0 and ferror(stdout)){
866
955
int e = errno;
867
956
if(debug){
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
870
959
}
871
960
errno = e;
872
961
goto mandos_end;
891
980
if(e == 0){
892
981
e = errno;
893
982
}
894
perror("close");
983
perror_plus("close");
895
984
}
896
985
gnutls_deinit(session);
986
errno = e;
897
987
if(quit_now){
898
e = EINTR;
988
errno = EINTR;
899
989
retval = -1;
900
990
}
901
errno = e;
902
991
}
903
992
return retval;
904
993
}
929
1018
switch(event){
930
1019
default:
931
1020
case AVAHI_RESOLVER_FAILURE:
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
avahi_strerror(avahi_server_errno(mc.server)));
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)));
935
1025
break;
936
1026
937
1027
case AVAHI_RESOLVER_FOUND:
939
1029
char ip[AVAHI_ADDRESS_STR_MAX];
940
1030
avahi_address_snprint(ip, sizeof(ip), address);
941
1031
if(debug){
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
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);
945
1035
}
946
1036
int ret = start_mandos_communication(ip, port, interface,
947
1037
avahi_proto_to_af(proto));
948
1038
if(ret == 0){
949
1039
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
}
950
1046
}
951
1047
}
952
1048
}
976
1072
default:
977
1073
case AVAHI_BROWSER_FAILURE:
978
1074
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
981
1077
avahi_simple_poll_quit(mc.simple_poll);
982
1078
return;
983
1079
990
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
1087
name, type, domain, protocol, 0,
992
1088
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
name, avahi_strerror(avahi_server_errno(mc.server)));
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1090
" %s\n", name,
1091
avahi_strerror(avahi_server_errno(mc.server)));
995
1092
break;
996
1093
997
1094
case AVAHI_BROWSER_REMOVE:
1000
1097
case AVAHI_BROWSER_ALL_FOR_NOW:
1001
1098
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1002
1099
if(debug){
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
1004
1102
}
1005
1103
break;
1006
1104
}
1007
1105
}
1008
1106
1009
/* stop main loop after sigterm has been called */
1107
/* Signal handler that stops main loop after SIGTERM */
1010
1108
static void handle_sigterm(int sig){
1011
1109
if(quit_now){
1012
1110
return;
1014
1112
quit_now = 1;
1015
1113
signal_received = sig;
1016
1114
int old_errno = errno;
1115
/* set main loop to exit */
1017
1116
if(mc.simple_poll != NULL){
1018
1117
avahi_simple_poll_quit(mc.simple_poll);
1019
1118
}
1020
1119
errno = old_errno;
1021
1120
}
1022
1121
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
1023
1684
int main(int argc, char *argv[]){
1024
1685
AvahiSServiceBrowser *sb = NULL;
1025
1686
int error;
1027
1688
intmax_t tmpmax;
1028
1689
char *tmp;
1029
1690
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1691
const char *interface = "";
1031
1692
struct ifreq network;
1032
1693
int sd = -1;
1033
1694
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1037
1695
char tempdir[] = "/tmp/mandosXXXXXX";
1038
1696
bool tempdir_created = false;
1039
1697
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1043
1701
bool gnutls_initialized = false;
1044
1702
bool gpgme_initialized = false;
1045
1703
float delay = 2.5f;
1704
double retry_interval = 10; /* 10s between trying a server and
1705
retrying the same server again */
1046
1706
1047
1707
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
1708
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1054
1714
errno = 0;
1055
1715
ret = setgid(gid);
1056
1716
if(ret == -1){
1057
perror("setgid");
1717
perror_plus("setgid");
1058
1718
}
1059
1719
1060
1720
/* Lower user privileges (temporarily) */
1061
1721
errno = 0;
1062
1722
ret = seteuid(uid);
1063
1723
if(ret == -1){
1064
perror("seteuid");
1724
perror_plus("seteuid");
1065
1725
}
1066
1726
1067
1727
if(quit_now){
1102
1762
.arg = "SECONDS",
1103
1763
.doc = "Maximum delay to wait for interface startup",
1104
1764
.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 },
1105
1773
/*
1106
1774
* These reproduce what we would get without ARGP_NO_HELP
1107
1775
*/
1151
1819
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
1820
argp_error(state, "Bad delay");
1153
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;
1154
1833
break;
1155
1834
/*
1156
1835
* These reproduce what we would get without ARGP_NO_HELP
1163
1842
argp_state_help(state, state->out_stream,
1164
1843
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
1844
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1845
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1167
1846
exit(argp_err_exit_status);
1168
1847
break;
1169
1848
default:
1184
1863
case ENOMEM:
1185
1864
default:
1186
1865
errno = ret;
1187
perror("argp_parse");
1866
perror_plus("argp_parse");
1188
1867
exitcode = EX_OSERR;
1189
1868
goto end;
1190
1869
case EINVAL:
1192
1871
goto end;
1193
1872
}
1194
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;
1937
}
1195
1938
1196
1939
if(not debug){
1197
1940
avahi_set_log_function(empty_log);
1198
1941
}
1199
1942
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
1200
1975
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
1976
from the signal handler */
1202
1977
/* Initialize the pseudo-RNG for Avahi */
1203
1978
srand((unsigned int) time(NULL));
1204
1979
mc.simple_poll = avahi_simple_poll_new();
1205
1980
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1981
fprintf_plus(stderr,
1982
"Avahi: Failed to create simple poll object.\n");
1207
1983
exitcode = EX_UNAVAILABLE;
1208
1984
goto end;
1209
1985
}
1211
1987
sigemptyset(&sigterm_action.sa_mask);
1212
1988
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
1989
if(ret == -1){
1214
perror("sigaddset");
1990
perror_plus("sigaddset");
1215
1991
exitcode = EX_OSERR;
1216
1992
goto end;
1217
1993
}
1218
1994
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
1995
if(ret == -1){
1220
perror("sigaddset");
1996
perror_plus("sigaddset");
1221
1997
exitcode = EX_OSERR;
1222
1998
goto end;
1223
1999
}
1224
2000
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
2001
if(ret == -1){
1226
perror("sigaddset");
2002
perror_plus("sigaddset");
1227
2003
exitcode = EX_OSERR;
1228
2004
goto end;
1229
2005
}
1233
2009
*/
1234
2010
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
2011
if(ret == -1){
1236
perror("sigaction");
2012
perror_plus("sigaction");
1237
2013
return EX_OSERR;
1238
2014
}
1239
2015
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
2016
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
2017
if(ret == -1){
1242
perror("sigaction");
2018
perror_plus("sigaction");
1243
2019
exitcode = EX_OSERR;
1244
2020
goto end;
1245
2021
}
1246
2022
}
1247
2023
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
2024
if(ret == -1){
1249
perror("sigaction");
2025
perror_plus("sigaction");
1250
2026
return EX_OSERR;
1251
2027
}
1252
2028
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
2029
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
2030
if(ret == -1){
1255
perror("sigaction");
2031
perror_plus("sigaction");
1256
2032
exitcode = EX_OSERR;
1257
2033
goto end;
1258
2034
}
1259
2035
}
1260
2036
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
2037
if(ret == -1){
1262
perror("sigaction");
2038
perror_plus("sigaction");
1263
2039
return EX_OSERR;
1264
2040
}
1265
2041
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
2042
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
2043
if(ret == -1){
1268
perror("sigaction");
2044
perror_plus("sigaction");
1269
2045
exitcode = EX_OSERR;
1270
2046
goto end;
1271
2047
}
1272
2048
}
1273
2049
1274
2050
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
1359
}
1360
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
break;
1378
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
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");
1415
2056
}
1416
2057
}
1417
2058
1421
2062
1422
2063
ret = init_gnutls_global(pubkey, seckey);
1423
2064
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
2065
fprintf_plus(stderr, "init_gnutls_global failed\n");
1425
2066
exitcode = EX_UNAVAILABLE;
1426
2067
goto end;
1427
2068
} else {
1432
2073
goto end;
1433
2074
}
1434
2075
2076
if(mkdtemp(tempdir) == NULL){
2077
perror_plus("mkdtemp");
2078
goto end;
2079
}
1435
2080
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
1439
goto end;
1440
}
1441
2081
1442
2082
if(quit_now){
1443
2083
goto end;
1444
2084
}
1445
2085
1446
2086
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
2087
fprintf_plus(stderr, "init_gpgme failed\n");
1448
2088
exitcode = EX_UNAVAILABLE;
1449
2089
goto end;
1450
2090
} else {
1459
2099
/* Connect directly, do not use Zeroconf */
1460
2100
/* (Mainly meant for debugging) */
1461
2101
char *address = strrchr(connect_to, ':');
2102
1462
2103
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
2104
fprintf_plus(stderr, "No colon in address\n");
1464
2105
exitcode = EX_USAGE;
1465
2106
goto end;
1466
2107
}
1474
2115
tmpmax = strtoimax(address+1, &tmp, 10);
1475
2116
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
2117
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2118
fprintf_plus(stderr, "Bad port number\n");
1478
2119
exitcode = EX_USAGE;
1479
2120
goto end;
1480
2121
}
1485
2126
1486
2127
port = (uint16_t)tmpmax;
1487
2128
*address = '\0';
1488
address = connect_to;
1489
2129
/* Colon in address indicates IPv6 */
1490
2130
int af;
1491
if(strchr(address, ':') != NULL){
2131
if(strchr(connect_to, ':') != NULL){
1492
2132
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
}
1493
2139
} else {
1494
2140
af = AF_INET;
1495
2141
}
2142
address = connect_to;
1496
2143
1497
2144
if(quit_now){
1498
2145
goto end;
1499
2146
}
1500
2147
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
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){
1523
2161
exitcode = EXIT_SUCCESS;
1524
2162
}
2163
1525
2164
goto end;
1526
2165
}
1527
2166
1549
2188
1550
2189
/* Check if creating the Avahi server object succeeded */
1551
2190
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
2191
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2192
avahi_strerror(error));
1554
2193
exitcode = EX_UNAVAILABLE;
1555
2194
goto end;
1556
2195
}
1564
2203
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
2204
NULL, 0, browse_callback, NULL);
1566
2205
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
2206
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2207
avahi_strerror(avahi_server_errno(mc.server)));
1569
2208
exitcode = EX_UNAVAILABLE;
1570
2209
goto end;
1571
2210
}
1577
2216
/* Run the main loop */
1578
2217
1579
2218
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
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
}
1584
2228
1585
2229
end:
1586
2230
1587
2231
if(debug){
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2232
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1589
2233
}
1590
2234
1591
2235
/* Cleanup things */
1608
2252
gpgme_release(mc.ctx);
1609
2253
}
1610
2254
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
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;
1618
2263
}
1619
if(geteuid() == 0){
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){
1620
2275
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
2276
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
2277
perror_plus("ioctl SIOCGIFFLAGS");
2278
} else if(network.ifr_flags & IFF_UP){
1624
2279
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
2280
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
2281
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1628
2283
}
1629
2284
}
1630
2285
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
2286
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
2287
perror_plus("close");
1639
2288
}
1640
2289
}
1641
2290
}
2291
/* Lower privileges permanently */
2292
errno = 0;
2293
ret = setuid(uid);
2294
if(ret == -1){
2295
perror_plus("setuid");
2296
}
1642
2297
1643
/* Removes the temp directory used by GPGME */
2298
/* Removes the GPGME temp directory and all files inside */
1644
2299
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
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];
1665
2307
char *fullname = NULL;
1666
2308
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
2309
direntry->d_name);
1668
2310
if(ret < 0){
1669
perror("asprintf");
2311
perror_plus("asprintf");
1670
2312
continue;
1671
2313
}
1672
2314
ret = remove(fullname);
1673
2315
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2316
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2317
strerror(errno));
1676
2318
}
1677
2319
free(fullname);
1678
2320
}
1679
closedir(d);
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");
1680
2327
}
1681
2328
ret = rmdir(tempdir);
1682
2329
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
2330
perror_plus("rmdir");
1684
2331
}
1685
2332
}
1686
2333
1691
2338
&old_sigterm_action,
1692
2339
NULL));
1693
2340
if(ret == -1){
1694
perror("sigaction");
2341
perror_plus("sigaction");
1695
2342
}
1696
2343
do {
1697
2344
ret = raise(signal_received);
1698
2345
} while(ret != 0 and errno == EINTR);
1699
2346
if(ret != 0){
1700
perror("raise");
2347
perror_plus("raise");
1701
2348
abort();
1702
2349
}
1703
2350
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0