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- Committer: Teddy Hogeborn
- Date: 2012-06-14 21:42:44 UTC
- Revision ID: teddy@recompile.se-20120614214244-meh2hr7pg0p0fek2
* plugins.d/mandos-client.c: Only print message about nonexisting
network hook directory in debug mode.
network hook directory in debug mode.
- 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
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
69
69
if_nametoindex(), IF_NAMESIZE */
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
77
#include <iso646.h> /* not, or, and */
78
78
#include <argp.h> /* struct argp_option, error_t, struct
79
79
argp_state, struct argp,
82
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
83
sigaction(), SIGTERM, sig_atomic_t,
84
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
85
94
86
95
#ifdef __linux__
87
96
#include <sys/klog.h> /* klogctl() */
105
114
init_gnutls_session(),
106
115
GNUTLS_* */
107
116
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
110
119
111
120
/* GPGME */
112
121
#include <gpgme.h> /* All GPGME types, constants and
120
129
#define PATHDIR "/conf/conf.d/mandos"
121
130
#define SECKEY "seckey.txt"
122
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
133
124
134
bool debug = false;
125
135
static const char mandos_protocol_version[] = "1";
126
136
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
128
154
129
155
/* Used for passing in values through the Avahi callback functions */
130
156
typedef struct {
135
161
gnutls_dh_params_t dh_params;
136
162
const char *priority;
137
163
gpgme_ctx_t ctx;
164
server *current_server;
138
165
} mandos_context;
139
166
140
167
/* global context so signal handler can reach it*/
141
168
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
169
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
144
172
145
173
sig_atomic_t quit_now = 0;
146
174
int signal_received = 0;
147
175
176
/* Function to use when printing errors */
177
void perror_plus(const char *print_text){
178
int e = errno;
179
fprintf(stderr, "Mandos plugin %s: ",
180
program_invocation_short_name);
181
errno = e;
182
perror(print_text);
183
}
184
185
__attribute__((format (gnu_printf, 2, 3)))
186
int fprintf_plus(FILE *stream, const char *format, ...){
187
va_list ap;
188
va_start (ap, format);
189
190
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
191
program_invocation_short_name));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
}
194
148
195
/*
149
196
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
197
* bytes. "buffer_capacity" is how much is currently allocated,
151
198
* "buffer_length" is how much is already used.
152
199
*/
153
200
size_t incbuffer(char **buffer, size_t buffer_length,
154
size_t buffer_capacity){
201
size_t buffer_capacity){
155
202
if(buffer_length + BUFFER_SIZE > buffer_capacity){
156
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
157
204
if(buffer == NULL){
162
209
return buffer_capacity;
163
210
}
164
211
212
/* Add server to set of servers to retry periodically */
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
214
int af){
215
int ret;
216
server *new_server = malloc(sizeof(server));
217
if(new_server == NULL){
218
perror_plus("malloc");
219
return false;
220
}
221
*new_server = (server){ .ip = strdup(ip),
222
.port = port,
223
.if_index = if_index,
224
.af = af };
225
if(new_server->ip == NULL){
226
perror_plus("strdup");
227
return false;
228
}
229
/* Special case of first server */
230
if (mc.current_server == NULL){
231
new_server->next = new_server;
232
new_server->prev = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
235
} else {
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
238
new_server->prev->next = new_server;
239
mc.current_server->prev = new_server;
240
}
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
242
if(ret == -1){
243
perror_plus("clock_gettime");
244
return false;
245
}
246
return true;
247
}
248
165
249
/*
166
250
* Initialize GPGME.
167
251
*/
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
170
254
gpgme_error_t rc;
171
255
gpgme_engine_info_t engine_info;
172
256
181
265
182
266
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
183
267
if(fd == -1){
184
perror("open");
268
perror_plus("open");
185
269
return false;
186
270
}
187
271
188
272
rc = gpgme_data_new_from_fd(&pgp_data, fd);
189
273
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
274
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
192
276
return false;
193
277
}
194
278
195
279
rc = gpgme_op_import(mc.ctx, pgp_data);
196
280
if(rc != GPG_ERR_NO_ERROR){
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
199
283
return false;
200
284
}
201
285
202
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
203
287
if(ret == -1){
204
perror("close");
288
perror_plus("close");
205
289
}
206
290
gpgme_data_release(pgp_data);
207
291
return true;
208
292
}
209
293
210
294
if(debug){
211
fprintf(stderr, "Initializing GPGME\n");
295
fprintf_plus(stderr, "Initializing GPGME\n");
212
296
}
213
297
214
298
/* Init GPGME */
215
299
gpgme_check_version(NULL);
216
300
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
217
301
if(rc != GPG_ERR_NO_ERROR){
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
220
304
return false;
221
305
}
222
306
223
/* Set GPGME home directory for the OpenPGP engine only */
307
/* Set GPGME home directory for the OpenPGP engine only */
224
308
rc = gpgme_get_engine_info(&engine_info);
225
309
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
310
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
228
312
return false;
229
313
}
230
314
while(engine_info != NULL){
236
320
engine_info = engine_info->next;
237
321
}
238
322
if(engine_info == NULL){
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
323
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
324
tempdir);
240
325
return false;
241
326
}
242
327
243
328
/* Create new GPGME "context" */
244
329
rc = gpgme_new(&(mc.ctx));
245
330
if(rc != GPG_ERR_NO_ERROR){
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
333
gpgme_strerror(rc));
248
334
return false;
249
335
}
250
336
269
355
ssize_t plaintext_length = 0;
270
356
271
357
if(debug){
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
358
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
273
359
}
274
360
275
361
/* Create new GPGME data buffer from memory cryptotext */
276
362
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
277
363
0);
278
364
if(rc != GPG_ERR_NO_ERROR){
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
365
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
281
367
return -1;
282
368
}
283
369
284
370
/* Create new empty GPGME data buffer for the plaintext */
285
371
rc = gpgme_data_new(&dh_plain);
286
372
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
373
fprintf_plus(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_data_new: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
289
376
gpgme_data_release(dh_crypto);
290
377
return -1;
291
378
}
294
381
data buffer */
295
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
296
383
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
299
386
plaintext_length = -1;
300
387
if(debug){
301
388
gpgme_decrypt_result_t result;
302
389
result = gpgme_op_decrypt_result(mc.ctx);
303
390
if(result == NULL){
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
305
392
} else {
306
fprintf(stderr, "Unsupported algorithm: %s\n",
307
result->unsupported_algorithm);
308
fprintf(stderr, "Wrong key usage: %u\n",
309
result->wrong_key_usage);
393
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf_plus(stderr, "Wrong key usage: %u\n",
396
result->wrong_key_usage);
310
397
if(result->file_name != NULL){
311
fprintf(stderr, "File name: %s\n", result->file_name);
398
fprintf_plus(stderr, "File name: %s\n", result->file_name);
312
399
}
313
400
gpgme_recipient_t recipient;
314
401
recipient = result->recipients;
315
402
while(recipient != NULL){
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");
403
fprintf_plus(stderr, "Public key algorithm: %s\n",
404
gpgme_pubkey_algo_name
405
(recipient->pubkey_algo));
406
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
407
fprintf_plus(stderr, "Secret key available: %s\n",
408
recipient->status == GPG_ERR_NO_SECKEY
409
? "No" : "Yes");
322
410
recipient = recipient->next;
323
411
}
324
412
}
327
415
}
328
416
329
417
if(debug){
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
418
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
331
419
}
332
420
333
421
/* Seek back to the beginning of the GPGME plaintext data buffer */
334
422
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
335
perror("gpgme_data_seek");
423
perror_plus("gpgme_data_seek");
336
424
plaintext_length = -1;
337
425
goto decrypt_end;
338
426
}
340
428
*plaintext = NULL;
341
429
while(true){
342
430
plaintext_capacity = incbuffer(plaintext,
343
(size_t)plaintext_length,
344
plaintext_capacity);
431
(size_t)plaintext_length,
432
plaintext_capacity);
345
433
if(plaintext_capacity == 0){
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
434
perror_plus("incbuffer");
435
plaintext_length = -1;
436
goto decrypt_end;
349
437
}
350
438
351
439
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
444
break;
357
445
}
358
446
if(ret < 0){
359
perror("gpgme_data_read");
447
perror_plus("gpgme_data_read");
360
448
plaintext_length = -1;
361
449
goto decrypt_end;
362
450
}
364
452
}
365
453
366
454
if(debug){
367
fprintf(stderr, "Decrypted password is: ");
455
fprintf_plus(stderr, "Decrypted password is: ");
368
456
for(ssize_t i = 0; i < plaintext_length; i++){
369
457
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
370
458
}
382
470
}
383
471
384
472
static const char * safer_gnutls_strerror(int value){
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
386
-Wunreachable-code */
473
const char *ret = gnutls_strerror(value);
387
474
if(ret == NULL)
388
475
ret = "(unknown)";
389
476
return ret;
392
479
/* GnuTLS log function callback */
393
480
static void debuggnutls(__attribute__((unused)) int level,
394
481
const char* string){
395
fprintf(stderr, "GnuTLS: %s", string);
482
fprintf_plus(stderr, "GnuTLS: %s", string);
396
483
}
397
484
398
485
static int init_gnutls_global(const char *pubkeyfilename,
400
487
int ret;
401
488
402
489
if(debug){
403
fprintf(stderr, "Initializing GnuTLS\n");
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
404
491
}
405
492
406
493
ret = gnutls_global_init();
407
494
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
410
497
return -1;
411
498
}
412
499
419
506
}
420
507
421
508
/* OpenPGP credentials */
422
gnutls_certificate_allocate_credentials(&mc.cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
423
510
if(ret != GNUTLS_E_SUCCESS){
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
512
safer_gnutls_strerror(ret));
429
513
gnutls_global_deinit();
430
514
return -1;
431
515
}
432
516
433
517
if(debug){
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
518
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
519
" secret key %s as GnuTLS credentials\n",
520
pubkeyfilename,
521
seckeyfilename);
437
522
}
438
523
439
524
ret = gnutls_certificate_set_openpgp_key_file
440
525
(mc.cred, pubkeyfilename, seckeyfilename,
441
526
GNUTLS_OPENPGP_FMT_BASE64);
442
527
if(ret != GNUTLS_E_SUCCESS){
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));
528
fprintf_plus(stderr,
529
"Error[%d] while reading the OpenPGP key pair ('%s',"
530
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
531
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
532
safer_gnutls_strerror(ret));
448
533
goto globalfail;
449
534
}
450
535
451
536
/* GnuTLS server initialization */
452
537
ret = gnutls_dh_params_init(&mc.dh_params);
453
538
if(ret != GNUTLS_E_SUCCESS){
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
" initialization: %s\n",
541
safer_gnutls_strerror(ret));
456
542
goto globalfail;
457
543
}
458
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
459
545
if(ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
462
548
goto globalfail;
463
549
}
464
550
484
570
}
485
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
572
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
489
576
}
490
577
491
578
{
498
585
}
499
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
500
587
if(ret != GNUTLS_E_SUCCESS){
501
fprintf(stderr, "Syntax error at: %s\n", err);
502
fprintf(stderr, "GnuTLS error: %s\n",
503
safer_gnutls_strerror(ret));
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
504
591
gnutls_deinit(*session);
505
592
return -1;
506
593
}
515
602
}
516
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
517
604
if(ret != GNUTLS_E_SUCCESS){
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
520
607
gnutls_deinit(*session);
521
608
return -1;
522
609
}
534
621
__attribute__((unused)) const char *txt){}
535
622
536
623
/* Called when a Mandos server is found */
537
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
538
625
AvahiIfIndex if_index,
539
626
int af){
540
627
int ret, tcp_sd = -1;
552
639
gnutls_session_t session;
553
640
int pf; /* Protocol family */
554
641
642
errno = 0;
643
555
644
if(quit_now){
645
errno = EINTR;
556
646
return -1;
557
647
}
558
648
564
654
pf = PF_INET;
565
655
break;
566
656
default:
567
fprintf(stderr, "Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
658
errno = EINVAL;
568
659
return -1;
569
660
}
570
661
574
665
}
575
666
576
667
if(debug){
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
669
PRIuMAX "\n", ip, (uintmax_t)port);
579
670
}
580
671
581
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
582
673
if(tcp_sd < 0){
583
perror("socket");
674
int e = errno;
675
perror_plus("socket");
676
errno = e;
584
677
goto mandos_end;
585
678
}
586
679
587
680
if(quit_now){
681
errno = EINTR;
588
682
goto mandos_end;
589
683
}
590
684
597
691
ret = inet_pton(af, ip, &to.in.sin_addr);
598
692
}
599
693
if(ret < 0 ){
600
perror("inet_pton");
694
int e = errno;
695
perror_plus("inet_pton");
696
errno = e;
601
697
goto mandos_end;
602
698
}
603
699
if(ret == 0){
604
fprintf(stderr, "Bad address: %s\n", ip);
700
int e = errno;
701
fprintf_plus(stderr, "Bad address: %s\n", ip);
702
errno = e;
605
703
goto mandos_end;
606
704
}
607
705
if(af == AF_INET6){
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
-Wconversion and
610
-Wunreachable-code */
611
706
to.in6.sin6_port = htons(port);
612
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
709
-Wunreachable-code*/
615
710
if(if_index == AVAHI_IF_UNSPEC){
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
711
fprintf_plus(stderr, "An IPv6 link-local address is"
712
" incomplete without a network interface\n");
713
errno = EINVAL;
618
714
goto mandos_end;
619
715
}
620
716
/* Set the network interface number as scope */
627
723
}
628
724
629
725
if(quit_now){
726
errno = EINTR;
630
727
goto mandos_end;
631
728
}
632
729
634
731
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
635
732
char interface[IF_NAMESIZE];
636
733
if(if_indextoname((unsigned int)if_index, interface) == NULL){
637
perror("if_indextoname");
734
perror_plus("if_indextoname");
638
735
} else {
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
641
738
}
642
739
} else {
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
645
742
}
646
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
647
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
654
751
sizeof(addrstr));
655
752
}
656
753
if(pcret == NULL){
657
perror("inet_ntop");
754
perror_plus("inet_ntop");
658
755
} else {
659
756
if(strcmp(addrstr, ip) != 0){
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
661
758
}
662
759
}
663
760
}
664
761
665
762
if(quit_now){
763
errno = EINTR;
666
764
goto mandos_end;
667
765
}
668
766
672
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
673
771
}
674
772
if(ret < 0){
675
perror("connect");
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
676
778
goto mandos_end;
677
779
}
678
780
679
781
if(quit_now){
782
errno = EINTR;
680
783
goto mandos_end;
681
784
}
682
785
685
788
while(true){
686
789
size_t out_size = strlen(out);
687
790
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
688
out_size - written));
791
out_size - written));
689
792
if(ret == -1){
690
perror("write");
793
int e = errno;
794
perror_plus("write");
795
errno = e;
691
796
goto mandos_end;
692
797
}
693
798
written += (size_t)ret;
703
808
}
704
809
705
810
if(quit_now){
811
errno = EINTR;
706
812
goto mandos_end;
707
813
}
708
814
}
709
815
710
816
if(debug){
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
817
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
712
818
}
713
819
714
820
if(quit_now){
821
errno = EINTR;
715
822
goto mandos_end;
716
823
}
717
824
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
825
/* This casting via intptr_t is to eliminate warning about casting
826
an int to a pointer type. This is exactly how the GnuTLS Guile
827
function "set-session-transport-fd!" does it. */
828
gnutls_transport_set_ptr(session,
829
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
719
830
720
831
if(quit_now){
832
errno = EINTR;
721
833
goto mandos_end;
722
834
}
723
835
724
836
do {
725
837
ret = gnutls_handshake(session);
726
838
if(quit_now){
839
errno = EINTR;
727
840
goto mandos_end;
728
841
}
729
842
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
730
843
731
844
if(ret != GNUTLS_E_SUCCESS){
732
845
if(debug){
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
846
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
734
847
gnutls_perror(ret);
735
848
}
849
errno = EPROTO;
736
850
goto mandos_end;
737
851
}
738
852
739
853
/* Read OpenPGP packet that contains the wanted password */
740
854
741
855
if(debug){
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
856
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
857
" %s\n", ip);
744
858
}
745
859
746
860
while(true){
747
861
748
862
if(quit_now){
863
errno = EINTR;
749
864
goto mandos_end;
750
865
}
751
866
752
867
buffer_capacity = incbuffer(&buffer, buffer_length,
753
buffer_capacity);
868
buffer_capacity);
754
869
if(buffer_capacity == 0){
755
perror("incbuffer");
870
int e = errno;
871
perror_plus("incbuffer");
872
errno = e;
756
873
goto mandos_end;
757
874
}
758
875
759
876
if(quit_now){
877
errno = EINTR;
760
878
goto mandos_end;
761
879
}
762
880
775
893
ret = gnutls_handshake(session);
776
894
777
895
if(quit_now){
896
errno = EINTR;
778
897
goto mandos_end;
779
898
}
780
899
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
781
900
if(ret < 0){
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
902
"***\n");
783
903
gnutls_perror(ret);
904
errno = EPROTO;
784
905
goto mandos_end;
785
906
}
786
907
break;
787
908
default:
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
909
fprintf_plus(stderr, "Unknown error while reading data from"
910
" encrypted session with Mandos server\n");
790
911
gnutls_bye(session, GNUTLS_SHUT_RDWR);
912
errno = EIO;
791
913
goto mandos_end;
792
914
}
793
915
} else {
796
918
}
797
919
798
920
if(debug){
799
fprintf(stderr, "Closing TLS session\n");
921
fprintf_plus(stderr, "Closing TLS session\n");
800
922
}
801
923
802
924
if(quit_now){
925
errno = EINTR;
803
926
goto mandos_end;
804
927
}
805
928
806
929
do {
807
930
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
808
931
if(quit_now){
932
errno = EINTR;
809
933
goto mandos_end;
810
934
}
811
935
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
936
813
937
if(buffer_length > 0){
814
938
ssize_t decrypted_buffer_size;
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
817
940
&decrypted_buffer);
818
941
if(decrypted_buffer_size >= 0){
819
942
820
943
written = 0;
821
944
while(written < (size_t) decrypted_buffer_size){
822
945
if(quit_now){
946
errno = EINTR;
823
947
goto mandos_end;
824
948
}
825
949
827
951
(size_t)decrypted_buffer_size - written,
828
952
stdout);
829
953
if(ret == 0 and ferror(stdout)){
954
int e = errno;
830
955
if(debug){
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
956
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
957
strerror(errno));
833
958
}
959
errno = e;
834
960
goto mandos_end;
835
961
}
836
962
written += (size_t)ret;
842
968
/* Shutdown procedure */
843
969
844
970
mandos_end:
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;
971
{
972
int e = errno;
973
free(decrypted_buffer);
974
free(buffer);
975
if(tcp_sd >= 0){
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
977
}
978
if(ret == -1){
979
if(e == 0){
980
e = errno;
981
}
982
perror_plus("close");
983
}
984
gnutls_deinit(session);
985
errno = e;
986
if(quit_now){
987
errno = EINTR;
988
retval = -1;
989
}
856
990
}
857
991
return retval;
858
992
}
871
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
872
1006
flags,
873
1007
AVAHI_GCC_UNUSED void* userdata){
874
assert(r);
1008
if(r == NULL){
1009
return;
1010
}
875
1011
876
1012
/* Called whenever a service has been resolved successfully or
877
1013
timed out */
883
1019
switch(event){
884
1020
default:
885
1021
case AVAHI_RESOLVER_FAILURE:
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)));
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1024
domain,
1025
avahi_strerror(avahi_server_errno(mc.server)));
889
1026
break;
890
1027
891
1028
case AVAHI_RESOLVER_FOUND:
893
1030
char ip[AVAHI_ADDRESS_STR_MAX];
894
1031
avahi_address_snprint(ip, sizeof(ip), address);
895
1032
if(debug){
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);
1033
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1034
PRIdMAX ") on port %" PRIu16 "\n", name,
1035
host_name, ip, (intmax_t)interface, port);
899
1036
}
900
int ret = start_mandos_communication(ip, port, interface,
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
interface,
901
1039
avahi_proto_to_af(proto));
902
1040
if(ret == 0){
903
1041
avahi_simple_poll_quit(mc.simple_poll);
1042
} else {
1043
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto))){
1045
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1046
" list\n", name);
1047
}
904
1048
}
905
1049
}
906
1050
}
917
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
1062
flags,
919
1063
AVAHI_GCC_UNUSED void* userdata){
920
assert(b);
1064
if(b == NULL){
1065
return;
1066
}
921
1067
922
1068
/* Called whenever a new services becomes available on the LAN or
923
1069
is removed from the LAN */
930
1076
default:
931
1077
case AVAHI_BROWSER_FAILURE:
932
1078
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
935
1081
avahi_simple_poll_quit(mc.simple_poll);
936
1082
return;
937
1083
944
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
1091
name, type, domain, protocol, 0,
946
1092
resolve_callback, NULL) == NULL)
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
949
1096
break;
950
1097
951
1098
case AVAHI_BROWSER_REMOVE:
954
1101
case AVAHI_BROWSER_ALL_FOR_NOW:
955
1102
case AVAHI_BROWSER_CACHE_EXHAUSTED:
956
1103
if(debug){
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
958
1106
}
959
1107
break;
960
1108
}
961
1109
}
962
1110
963
/* stop main loop after sigterm has been called */
1111
/* Signal handler that stops main loop after SIGTERM */
964
1112
static void handle_sigterm(int sig){
965
1113
if(quit_now){
966
1114
return;
968
1116
quit_now = 1;
969
1117
signal_received = sig;
970
1118
int old_errno = errno;
1119
/* set main loop to exit */
971
1120
if(mc.simple_poll != NULL){
972
1121
avahi_simple_poll_quit(mc.simple_poll);
973
1122
}
974
1123
errno = old_errno;
975
1124
}
976
1125
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
int ret;
1128
error_t ret_errno;
1129
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
if(s < 0){
1132
ret_errno = errno;
1133
perror_plus("socket");
1134
errno = ret_errno;
1135
return false;
1136
}
1137
strcpy(ifr->ifr_name, ifname);
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
if(ret == -1){
1140
if(debug){
1141
ret_errno = errno;
1142
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1144
}
1145
return false;
1146
}
1147
return true;
1148
}
1149
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1152
/* Reject the loopback device */
1153
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1156
ifname);
1157
}
1158
return false;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf_plus(stderr, "Accepting point-to-point interface"
1164
" \"%s\"\n", ifname);
1165
}
1166
return true;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1172
" \"%s\"\n", ifname);
1173
}
1174
return false;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(ifr->ifr_flags & IFF_NOARP){
1178
if(debug){
1179
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
ifname);
1181
}
1182
return false;
1183
}
1184
1185
/* Accept this device */
1186
if(debug){
1187
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1188
}
1189
return true;
1190
}
1191
1192
/*
1193
* This function determines if a directory entry in /sys/class/net
1194
* corresponds to an acceptable network device.
1195
* (This function is passed to scandir(3) as a filter function.)
1196
*/
1197
int good_interface(const struct dirent *if_entry){
1198
if(if_entry->d_name[0] == '.'){
1199
return 0;
1200
}
1201
1202
struct ifreq ifr;
1203
if(not get_flags(if_entry->d_name, &ifr)){
1204
if(debug){
1205
fprintf_plus(stderr, "Failed to get flags for interface "
1206
"\"%s\"\n", if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
/*
1218
* This function determines if a network interface is up.
1219
*/
1220
bool interface_is_up(const char *interface){
1221
struct ifreq ifr;
1222
if(not get_flags(interface, &ifr)){
1223
if(debug){
1224
fprintf_plus(stderr, "Failed to get flags for interface "
1225
"\"%s\"\n", interface);
1226
}
1227
return false;
1228
}
1229
1230
return (bool)(ifr.ifr_flags & IFF_UP);
1231
}
1232
1233
/*
1234
* This function determines if a network interface is running
1235
*/
1236
bool interface_is_running(const char *interface){
1237
struct ifreq ifr;
1238
if(not get_flags(interface, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", interface);
1242
}
1243
return false;
1244
}
1245
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
}
1248
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1255
return 0;
1256
}
1257
return 1;
1258
}
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
int ret;
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1326
1327
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1332
}
1333
ret = avahi_simple_poll_iterate(s, -1);
1334
} else {
1335
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1338
}
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1341
if(ret == -1){
1342
perror_plus("clock_gettime");
1343
return -1;
1344
}
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1358
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1361
}
1362
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1368
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1370
return 0;
1371
}
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1374
if(ret == -1){
1375
perror_plus("clock_gettime");
1376
return -1;
1377
}
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1381
}
1382
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
}
1385
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1388
}
1389
}
1390
}
1391
}
1392
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1446
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
1453
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
perror_plus("scandir");
1460
}
1461
} else {
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1467
if(ret < 0){
1468
perror_plus("asprintf");
1469
continue;
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1475
pid_t hook_pid = fork();
1476
if(hook_pid == 0){
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1492
dup2(devnull, STDIN_FILENO);
1493
close(devnull);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1496
if(ret == -1){
1497
perror_plus("setenv");
1498
_exit(EX_OSERR);
1499
}
1500
ret = setenv("DEVICE", interface, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("MODE", mode, 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
char *delaystring;
1516
ret = asprintf(&delaystring, "%f", delay);
1517
if(ret == -1){
1518
perror_plus("asprintf");
1519
_exit(EX_OSERR);
1520
}
1521
ret = setenv("DELAY", delaystring, 1);
1522
if(ret == -1){
1523
free(delaystring);
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
free(delaystring);
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
1539
} else {
1540
int status;
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1543
free(fullname);
1544
continue;
1545
}
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1551
free(fullname);
1552
continue;
1553
}
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1557
WTERMSIG(status));
1558
free(fullname);
1559
continue;
1560
} else {
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1563
free(fullname);
1564
continue;
1565
}
1566
}
1567
free(fullname);
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1571
}
1572
}
1573
close(devnull);
1574
}
1575
return true;
1576
}
1577
1578
error_t bring_up_interface(const char *const interface,
1579
const float delay){
1580
int sd = -1;
1581
error_t old_errno = errno;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
1584
struct ifreq network;
1585
unsigned int if_index = if_nametoindex(interface);
1586
if(if_index == 0){
1587
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1588
errno = old_errno;
1589
return ENXIO;
1590
}
1591
1592
if(quit_now){
1593
errno = old_errno;
1594
return EINTR;
1595
}
1596
1597
if(not interface_is_up(interface)){
1598
if(not get_flags(interface, &network) and debug){
1599
ret_errno = errno;
1600
fprintf_plus(stderr, "Failed to get flags for interface "
1601
"\"%s\"\n", interface);
1602
return ret_errno;
1603
}
1604
network.ifr_flags |= IFF_UP;
1605
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
1608
ret_errno = errno;
1609
perror_plus("socket");
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
1614
if(quit_now){
1615
close(sd);
1616
errno = old_errno;
1617
return EINTR;
1618
}
1619
1620
if(debug){
1621
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1622
interface);
1623
}
1624
1625
/* Raise priviliges */
1626
raise_privileges();
1627
1628
#ifdef __linux__
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
perror_plus("klogctl");
1636
}
1637
#endif /* __linux__ */
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
1640
#ifdef __linux__
1641
if(restore_loglevel){
1642
ret_linux = klogctl(7, NULL, 0);
1643
if(ret_linux == -1){
1644
perror_plus("klogctl");
1645
}
1646
}
1647
#endif /* __linux__ */
1648
1649
/* Lower privileges */
1650
lower_privileges();
1651
1652
/* Close the socket */
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1654
if(ret == -1){
1655
perror_plus("close");
1656
}
1657
1658
if(ret_setflags == -1){
1659
errno = ret_errno;
1660
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1661
errno = old_errno;
1662
return ret_errno;
1663
}
1664
} else if(debug){
1665
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1666
interface);
1667
}
1668
1669
/* Sleep checking until interface is running.
1670
Check every 0.25s, up to total time of delay */
1671
for(int i=0; i < delay * 4; i++){
1672
if(interface_is_running(interface)){
1673
break;
1674
}
1675
struct timespec sleeptime = { .tv_nsec = 250000000 };
1676
ret = nanosleep(&sleeptime, NULL);
1677
if(ret == -1 and errno != EINTR){
1678
perror_plus("nanosleep");
1679
}
1680
}
1681
1682
errno = old_errno;
1683
return 0;
1684
}
1685
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
1691
struct ifreq network;
1692
unsigned int if_index = if_nametoindex(interface);
1693
if(if_index == 0){
1694
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1695
errno = old_errno;
1696
return ENXIO;
1697
}
1698
if(interface_is_up(interface)){
1699
if(not get_flags(interface, &network) and debug){
1700
ret_errno = errno;
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1702
"\"%s\"\n", interface);
1703
return ret_errno;
1704
}
1705
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1706
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
1709
ret_errno = errno;
1710
perror_plus("socket");
1711
errno = old_errno;
1712
return ret_errno;
1713
}
1714
1715
if(debug){
1716
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1717
interface);
1718
}
1719
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
lower_privileges();
1728
1729
/* Close the socket */
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1731
if(ret == -1){
1732
perror_plus("close");
1733
}
1734
1735
if(ret_setflags == -1){
1736
errno = ret_errno;
1737
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
errno = old_errno;
1739
return ret_errno;
1740
}
1741
} else if(debug){
1742
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1743
interface);
1744
}
1745
1746
errno = old_errno;
1747
return 0;
1748
}
1749
977
1750
int main(int argc, char *argv[]){
978
1751
AvahiSServiceBrowser *sb = NULL;
979
int error;
1752
error_t ret_errno;
980
1753
int ret;
981
1754
intmax_t tmpmax;
982
1755
char *tmp;
983
1756
int exitcode = EXIT_SUCCESS;
984
const char *interface = "eth0";
985
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
1759
char *interfaces_to_take_down = NULL;
1760
size_t interfaces_to_take_down_size = 0;
991
1761
char tempdir[] = "/tmp/mandosXXXXXX";
992
1762
bool tempdir_created = false;
993
1763
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
994
1764
const char *seckey = PATHDIR "/" SECKEY;
995
1765
const char *pubkey = PATHDIR "/" PUBKEY;
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
996
1768
997
1769
bool gnutls_initialized = false;
998
1770
bool gpgme_initialized = false;
999
1771
float delay = 2.5f;
1772
double retry_interval = 10; /* 10s between trying a server and
1773
retrying the same server again */
1000
1774
1001
1775
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1002
1776
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1008
1782
errno = 0;
1009
1783
ret = setgid(gid);
1010
1784
if(ret == -1){
1011
perror("setgid");
1785
perror_plus("setgid");
1012
1786
}
1013
1787
1014
1788
/* Lower user privileges (temporarily) */
1015
1789
errno = 0;
1016
1790
ret = seteuid(uid);
1017
1791
if(ret == -1){
1018
perror("seteuid");
1792
perror_plus("seteuid");
1019
1793
}
1020
1794
1021
1795
if(quit_now){
1056
1830
.arg = "SECONDS",
1057
1831
.doc = "Maximum delay to wait for interface startup",
1058
1832
.group = 2 },
1833
{ .name = "retry", .key = 132,
1834
.arg = "SECONDS",
1835
.doc = "Retry interval used when denied by the Mandos server",
1836
.group = 2 },
1837
{ .name = "network-hook-dir", .key = 133,
1838
.arg = "DIR",
1839
.doc = "Directory where network hooks are located",
1840
.group = 2 },
1841
/*
1842
* These reproduce what we would get without ARGP_NO_HELP
1843
*/
1844
{ .name = "help", .key = '?',
1845
.doc = "Give this help list", .group = -1 },
1846
{ .name = "usage", .key = -3,
1847
.doc = "Give a short usage message", .group = -1 },
1848
{ .name = "version", .key = 'V',
1849
.doc = "Print program version", .group = -1 },
1059
1850
{ .name = NULL }
1060
1851
};
1061
1852
1062
1853
error_t parse_opt(int key, char *arg,
1063
1854
struct argp_state *state){
1855
errno = 0;
1064
1856
switch(key){
1065
1857
case 128: /* --debug */
1066
1858
debug = true;
1069
1861
connect_to = arg;
1070
1862
break;
1071
1863
case 'i': /* --interface */
1072
interface = arg;
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
1866
if(ret_errno != 0){
1867
argp_error(state, "%s", strerror(ret_errno));
1868
}
1073
1869
break;
1074
1870
case 's': /* --seckey */
1075
1871
seckey = arg;
1082
1878
tmpmax = strtoimax(arg, &tmp, 10);
1083
1879
if(errno != 0 or tmp == arg or *tmp != '\0'
1084
1880
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
1881
argp_error(state, "Bad number of DH bits");
1087
1882
}
1088
1883
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1089
1884
break;
1094
1889
errno = 0;
1095
1890
delay = strtof(arg, &tmp);
1096
1891
if(errno != 0 or tmp == arg or *tmp != '\0'){
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:
1892
argp_error(state, "Bad delay");
1893
}
1894
case 132: /* --retry */
1895
errno = 0;
1896
retry_interval = strtod(arg, &tmp);
1897
if(errno != 0 or tmp == arg or *tmp != '\0'
1898
or (retry_interval * 1000) > INT_MAX
1899
or retry_interval < 0){
1900
argp_error(state, "Bad retry interval");
1901
}
1902
break;
1903
case 133: /* --network-hook-dir */
1904
hookdir = arg;
1905
break;
1906
/*
1907
* These reproduce what we would get without ARGP_NO_HELP
1908
*/
1909
case '?': /* --help */
1910
argp_state_help(state, state->out_stream,
1911
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1912
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1913
case -3: /* --usage */
1914
argp_state_help(state, state->out_stream,
1915
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1916
case 'V': /* --version */
1917
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1918
exit(argp_err_exit_status);
1104
1919
break;
1105
1920
default:
1106
1921
return ARGP_ERR_UNKNOWN;
1107
1922
}
1108
return 0;
1923
return errno;
1109
1924
}
1110
1925
1111
1926
struct argp argp = { .options = options, .parser = parse_opt,
1112
1927
.args_doc = "",
1113
1928
.doc = "Mandos client -- Get and decrypt"
1114
1929
" passwords from a Mandos server" };
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;
1930
ret = argp_parse(&argp, argc, argv,
1931
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1932
switch(ret){
1933
case 0:
1934
break;
1935
case ENOMEM:
1936
default:
1937
errno = ret;
1938
perror_plus("argp_parse");
1939
exitcode = EX_OSERR;
1940
goto end;
1941
case EINVAL:
1942
exitcode = EX_USAGE;
1943
goto end;
1944
}
1945
}
1946
1947
{
1948
/* Work around Debian bug #633582:
1949
<http://bugs.debian.org/633582> */
1950
1951
/* Re-raise priviliges */
1952
if(raise_privileges() == 0){
1953
struct stat st;
1954
1955
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1956
int seckey_fd = open(seckey, O_RDONLY);
1957
if(seckey_fd == -1){
1958
perror_plus("open");
1959
} else {
1960
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1961
if(ret == -1){
1962
perror_plus("fstat");
1963
} else {
1964
if(S_ISREG(st.st_mode)
1965
and st.st_uid == 0 and st.st_gid == 0){
1966
ret = fchown(seckey_fd, uid, gid);
1967
if(ret == -1){
1968
perror_plus("fchown");
1969
}
1970
}
1971
}
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
1973
}
1974
}
1975
1976
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1977
int pubkey_fd = open(pubkey, O_RDONLY);
1978
if(pubkey_fd == -1){
1979
perror_plus("open");
1980
} else {
1981
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1982
if(ret == -1){
1983
perror_plus("fstat");
1984
} else {
1985
if(S_ISREG(st.st_mode)
1986
and st.st_uid == 0 and st.st_gid == 0){
1987
ret = fchown(pubkey_fd, uid, gid);
1988
if(ret == -1){
1989
perror_plus("fchown");
1990
}
1991
}
1992
}
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
1997
/* Lower privileges */
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2002
}
2003
}
2004
}
2005
2006
/* Remove empty interface names */
2007
{
2008
char *interface = NULL;
2009
while((interface = argz_next(interfaces, interfaces_size,
2010
interface))){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2013
fprintf_plus(stderr, "Not using nonexisting interface"
2014
" \"%s\"\n", interface);
2015
}
2016
argz_delete(&interfaces, &interfaces_size, interface);
2017
interface = NULL;
2018
}
2019
}
2020
}
2021
2022
/* Run network hooks */
2023
{
2024
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2025
interfaces, interfaces_size);
2026
if(ret_errno != 0){
2027
errno = ret_errno;
2028
perror_plus("argz_append");
2029
goto end;
2030
}
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2032
if(not run_network_hooks("start", interfaces_hooks, delay)){
1119
2033
goto end;
1120
2034
}
1121
2035
}
1130
2044
srand((unsigned int) time(NULL));
1131
2045
mc.simple_poll = avahi_simple_poll_new();
1132
2046
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
2047
fprintf_plus(stderr,
2048
"Avahi: Failed to create simple poll object.\n");
2049
exitcode = EX_UNAVAILABLE;
1135
2050
goto end;
1136
2051
}
1137
2052
1138
2053
sigemptyset(&sigterm_action.sa_mask);
1139
2054
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1140
2055
if(ret == -1){
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
2056
perror_plus("sigaddset");
2057
exitcode = EX_OSERR;
1143
2058
goto end;
1144
2059
}
1145
2060
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1146
2061
if(ret == -1){
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
2062
perror_plus("sigaddset");
2063
exitcode = EX_OSERR;
1149
2064
goto end;
1150
2065
}
1151
2066
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1152
2067
if(ret == -1){
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
2068
perror_plus("sigaddset");
2069
exitcode = EX_OSERR;
1155
2070
goto end;
1156
2071
}
1157
2072
/* Need to check if the handler is SIG_IGN before handling:
1160
2075
*/
1161
2076
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1162
2077
if(ret == -1){
1163
perror("sigaction");
1164
return EXIT_FAILURE;
2078
perror_plus("sigaction");
2079
return EX_OSERR;
1165
2080
}
1166
2081
if(old_sigterm_action.sa_handler != SIG_IGN){
1167
2082
ret = sigaction(SIGINT, &sigterm_action, NULL);
1168
2083
if(ret == -1){
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
2084
perror_plus("sigaction");
2085
exitcode = EX_OSERR;
1171
2086
goto end;
1172
2087
}
1173
2088
}
1174
2089
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1175
2090
if(ret == -1){
1176
perror("sigaction");
1177
return EXIT_FAILURE;
2091
perror_plus("sigaction");
2092
return EX_OSERR;
1178
2093
}
1179
2094
if(old_sigterm_action.sa_handler != SIG_IGN){
1180
2095
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1181
2096
if(ret == -1){
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
2097
perror_plus("sigaction");
2098
exitcode = EX_OSERR;
1184
2099
goto end;
1185
2100
}
1186
2101
}
1187
2102
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1188
2103
if(ret == -1){
1189
perror("sigaction");
1190
return EXIT_FAILURE;
2104
perror_plus("sigaction");
2105
return EX_OSERR;
1191
2106
}
1192
2107
if(old_sigterm_action.sa_handler != SIG_IGN){
1193
2108
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1194
2109
if(ret == -1){
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
2110
perror_plus("sigaction");
2111
exitcode = EX_OSERR;
1197
2112
goto end;
1198
2113
}
1199
2114
}
1200
2115
1201
/* If the interface is down, bring it up */
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
}
2116
/* If no interfaces were specified, make a list */
2117
if(interfaces == NULL){
2118
struct dirent **direntries;
2119
/* Look for any good interfaces */
2120
ret = scandir(sys_class_net, &direntries, good_interface,
2121
alphasort);
2122
if(ret >= 1){
2123
/* Add all found interfaces to interfaces list */
2124
for(int i = 0; i < ret; ++i){
2125
ret_errno = argz_add(&interfaces, &interfaces_size,
2126
direntries[i]->d_name);
2127
if(ret_errno != 0){
2128
perror_plus("argz_add");
2129
continue;
2130
}
2131
if(debug){
2132
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2133
direntries[i]->d_name);
2134
}
2135
}
2136
free(direntries);
1336
2137
} else {
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
2138
free(direntries);
2139
fprintf_plus(stderr, "Could not find a network interface\n");
2140
exitcode = EXIT_FAILURE;
2141
goto end;
2142
}
2143
}
2144
2145
/* If we only got one interface, explicitly use only that one */
2146
if(argz_count(interfaces, interfaces_size) == 1){
2147
if(debug){
2148
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2149
interfaces);
2150
}
2151
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2152
}
2153
2154
/* Bring up interfaces which are down */
2155
if(not (argz_count(interfaces, interfaces_size) == 1
2156
and strcmp(interfaces, "none") == 0)){
2157
char *interface = NULL;
2158
while((interface = argz_next(interfaces, interfaces_size,
2159
interface))){
2160
bool interface_was_up = interface_is_up(interface);
2161
ret = bring_up_interface(interface, delay);
2162
if(not interface_was_up){
2163
if(ret != 0){
2164
errno = ret;
2165
perror_plus("Failed to bring up interface");
2166
} else {
2167
ret_errno = argz_add(&interfaces_to_take_down,
2168
&interfaces_to_take_down_size,
2169
interface);
2170
}
1341
2171
}
1342
2172
}
2173
free(interfaces);
2174
interfaces = NULL;
2175
interfaces_size = 0;
2176
if(debug and (interfaces_to_take_down == NULL)){
2177
fprintf_plus(stderr, "No interfaces were brought up\n");
2178
}
1343
2179
}
1344
2180
1345
2181
if(quit_now){
1348
2184
1349
2185
ret = init_gnutls_global(pubkey, seckey);
1350
2186
if(ret == -1){
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2187
fprintf_plus(stderr, "init_gnutls_global failed\n");
2188
exitcode = EX_UNAVAILABLE;
1353
2189
goto end;
1354
2190
} else {
1355
2191
gnutls_initialized = true;
1359
2195
goto end;
1360
2196
}
1361
2197
2198
if(mkdtemp(tempdir) == NULL){
2199
perror_plus("mkdtemp");
2200
goto end;
2201
}
1362
2202
tempdir_created = true;
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
perror("mkdtemp");
1366
goto end;
1367
}
1368
2203
1369
2204
if(quit_now){
1370
2205
goto end;
1371
2206
}
1372
2207
1373
2208
if(not init_gpgme(pubkey, seckey, tempdir)){
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2209
fprintf_plus(stderr, "init_gpgme failed\n");
2210
exitcode = EX_UNAVAILABLE;
1376
2211
goto end;
1377
2212
} else {
1378
2213
gpgme_initialized = true;
1386
2221
/* Connect directly, do not use Zeroconf */
1387
2222
/* (Mainly meant for debugging) */
1388
2223
char *address = strrchr(connect_to, ':');
2224
1389
2225
if(address == NULL){
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2226
fprintf_plus(stderr, "No colon in address\n");
2227
exitcode = EX_USAGE;
1392
2228
goto end;
1393
2229
}
1394
2230
1396
2232
goto end;
1397
2233
}
1398
2234
1399
uint16_t port;
2235
in_port_t port;
1400
2236
errno = 0;
1401
2237
tmpmax = strtoimax(address+1, &tmp, 10);
1402
2238
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1403
or tmpmax != (uint16_t)tmpmax){
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2239
or tmpmax != (in_port_t)tmpmax){
2240
fprintf_plus(stderr, "Bad port number\n");
2241
exitcode = EX_USAGE;
1406
2242
goto end;
1407
2243
}
1408
2244
1410
2246
goto end;
1411
2247
}
1412
2248
1413
port = (uint16_t)tmpmax;
2249
port = (in_port_t)tmpmax;
1414
2250
*address = '\0';
1415
address = connect_to;
1416
2251
/* Colon in address indicates IPv6 */
1417
2252
int af;
1418
if(strchr(address, ':') != NULL){
2253
if(strchr(connect_to, ':') != NULL){
1419
2254
af = AF_INET6;
2255
/* Accept [] around IPv6 address - see RFC 5952 */
2256
if(connect_to[0] == '[' and address[-1] == ']')
2257
{
2258
connect_to++;
2259
address[-1] = '\0';
2260
}
1420
2261
} else {
1421
2262
af = AF_INET;
1422
2263
}
2264
address = connect_to;
1423
2265
1424
2266
if(quit_now){
1425
2267
goto end;
1426
2268
}
1427
2269
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2270
while(not quit_now){
2271
ret = start_mandos_communication(address, port, if_index, af);
2272
if(quit_now or ret == 0){
2273
break;
2274
}
2275
if(debug){
2276
fprintf_plus(stderr, "Retrying in %d seconds\n",
2277
(int)retry_interval);
2278
}
2279
sleep((int)retry_interval);
2280
}
2281
2282
if (not quit_now){
1432
2283
exitcode = EXIT_SUCCESS;
1433
2284
}
2285
1434
2286
goto end;
1435
2287
}
1436
2288
1450
2302
/* Allocate a new server */
1451
2303
mc.server = avahi_server_new(avahi_simple_poll_get
1452
2304
(mc.simple_poll), &config, NULL,
1453
NULL, &error);
2305
NULL, &ret_errno);
1454
2306
1455
2307
/* Free the Avahi configuration data */
1456
2308
avahi_server_config_free(&config);
1458
2310
1459
2311
/* Check if creating the Avahi server object succeeded */
1460
2312
if(mc.server == NULL){
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
2313
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2314
avahi_strerror(ret_errno));
2315
exitcode = EX_UNAVAILABLE;
1464
2316
goto end;
1465
2317
}
1466
2318
1473
2325
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1474
2326
NULL, 0, browse_callback, NULL);
1475
2327
if(sb == NULL){
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
2328
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2329
avahi_strerror(avahi_server_errno(mc.server)));
2330
exitcode = EX_UNAVAILABLE;
1479
2331
goto end;
1480
2332
}
1481
2333
1486
2338
/* Run the main loop */
1487
2339
1488
2340
if(debug){
1489
fprintf(stderr, "Starting Avahi loop search\n");
1490
}
1491
1492
avahi_simple_poll_loop(mc.simple_poll);
2341
fprintf_plus(stderr, "Starting Avahi loop search\n");
2342
}
2343
2344
ret = avahi_loop_with_timeout(mc.simple_poll,
2345
(int)(retry_interval * 1000));
2346
if(debug){
2347
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2348
(ret == 0) ? "successfully" : "with error");
2349
}
1493
2350
1494
2351
end:
1495
2352
1496
2353
if(debug){
1497
fprintf(stderr, "%s exiting\n", argv[0]);
2354
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1498
2355
}
1499
2356
1500
2357
/* Cleanup things */
1517
2374
gpgme_release(mc.ctx);
1518
2375
}
1519
2376
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");
2377
/* Cleans up the circular linked list of Mandos servers the client
2378
has seen */
2379
if(mc.current_server != NULL){
2380
mc.current_server->prev->next = NULL;
2381
while(mc.current_server != NULL){
2382
server *next = mc.current_server->next;
2383
free(mc.current_server);
2384
mc.current_server = next;
1527
2385
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
2386
}
2387
2388
/* Re-raise priviliges */
2389
{
2390
raise_privileges();
2391
2392
/* Run network hooks */
2393
run_network_hooks("stop", interfaces_hooks, delay);
2394
2395
/* Take down the network interfaces which were brought up */
2396
{
2397
char *interface = NULL;
2398
while((interface=argz_next(interfaces_to_take_down,
2399
interfaces_to_take_down_size,
2400
interface))){
2401
ret_errno = take_down_interface(interface);
2402
if(ret_errno != 0){
2403
errno = ret_errno;
2404
perror_plus("Failed to take down interface");
1537
2405
}
1538
2406
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
2407
if(debug and (interfaces_to_take_down == NULL)){
2408
fprintf_plus(stderr, "No interfaces needed to be taken"
2409
" down\n");
1548
2410
}
1549
2411
}
2412
2413
lower_privileges_permanently();
1550
2414
}
1551
2415
1552
/* Removes the temp directory used by GPGME */
2416
free(interfaces_to_take_down);
2417
free(interfaces_hooks);
2418
2419
/* Removes the GPGME temp directory and all files inside */
1553
2420
if(tempdir_created){
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
}
2421
struct dirent **direntries = NULL;
2422
struct dirent *direntry = NULL;
2423
int numentries = scandir(tempdir, &direntries, notdotentries,
2424
alphasort);
2425
if (numentries > 0){
2426
for(int i = 0; i < numentries; i++){
2427
direntry = direntries[i];
1574
2428
char *fullname = NULL;
1575
2429
ret = asprintf(&fullname, "%s/%s", tempdir,
1576
2430
direntry->d_name);
1577
2431
if(ret < 0){
1578
perror("asprintf");
2432
perror_plus("asprintf");
1579
2433
continue;
1580
2434
}
1581
2435
ret = remove(fullname);
1582
2436
if(ret == -1){
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
2437
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2438
strerror(errno));
1585
2439
}
1586
2440
free(fullname);
1587
2441
}
1588
closedir(d);
2442
}
2443
2444
/* need to clean even if 0 because man page doesn't specify */
2445
free(direntries);
2446
if (numentries == -1){
2447
perror_plus("scandir");
1589
2448
}
1590
2449
ret = rmdir(tempdir);
1591
2450
if(ret == -1 and errno != ENOENT){
1592
perror("rmdir");
2451
perror_plus("rmdir");
1593
2452
}
1594
2453
}
1595
2454
1600
2459
&old_sigterm_action,
1601
2460
NULL));
1602
2461
if(ret == -1){
1603
perror("sigaction");
2462
perror_plus("sigaction");
1604
2463
}
1605
2464
do {
1606
2465
ret = raise(signal_received);
1607
2466
} while(ret != 0 and errno == EINTR);
1608
2467
if(ret != 0){
1609
perror("raise");
2468
perror_plus("raise");
1610
2469
abort();
1611
2470
}
1612
2471
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0