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- Committer: Björn Påhlsson
- Date: 2009-09-21 21:57:23 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 415.
- Revision ID: belorn@braxen-20090921215723-no1445t10clzl0e1
added documentation todo
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
85
96
86
#ifdef __linux__
97
87
#include <sys/klog.h> /* klogctl() */
115
105
init_gnutls_session(),
116
106
GNUTLS_* */
117
107
#include <gnutls/openpgp.h>
118
/* gnutls_certificate_set_openpgp_key_file(),
119
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
120
110
121
111
/* GPGME */
122
112
#include <gpgme.h> /* All GPGME types, constants and
130
120
#define PATHDIR "/conf/conf.d/mandos"
131
121
#define SECKEY "seckey.txt"
132
122
#define PUBKEY "pubkey.txt"
133
#define HOOKDIR "/lib/mandos/network-hooks.d"
134
123
135
124
bool debug = false;
136
125
static const char mandos_protocol_version[] = "1";
137
126
const char *argp_program_version = "mandos-client " VERSION;
138
const char *argp_program_bug_address = "<mandos@recompile.se>";
139
static const char sys_class_net[] = "/sys/class/net";
140
char *connect_to = NULL;
141
const char *hookdir = HOOKDIR;
142
uid_t uid = 65534;
143
gid_t gid = 65534;
144
145
/* Doubly linked list that need to be circularly linked when used */
146
typedef struct server{
147
const char *ip;
148
uint16_t port;
149
AvahiIfIndex if_index;
150
int af;
151
struct timespec last_seen;
152
struct server *next;
153
struct server *prev;
154
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
155
128
156
129
/* Used for passing in values through the Avahi callback functions */
157
130
typedef struct {
162
135
gnutls_dh_params_t dh_params;
163
136
const char *priority;
164
137
gpgme_ctx_t ctx;
165
server *current_server;
166
138
} mandos_context;
167
139
168
140
/* global context so signal handler can reach it*/
169
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
170
142
.dh_bits = 1024, .priority = "SECURE256"
171
":!CTYPE-X.509:+CTYPE-OPENPGP",
172
.current_server = NULL };
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
144
174
145
sig_atomic_t quit_now = 0;
175
146
int signal_received = 0;
176
147
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
196
148
/*
197
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
150
* bytes. "buffer_capacity" is how much is currently allocated,
199
151
* "buffer_length" is how much is already used.
200
152
*/
201
153
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
154
size_t buffer_capacity){
203
155
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
157
if(buffer == NULL){
210
162
return buffer_capacity;
211
163
}
212
164
213
/* Add server to set of servers to retry periodically */
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
215
int af){
216
int ret;
217
server *new_server = malloc(sizeof(server));
218
if(new_server == NULL){
219
perror_plus("malloc");
220
return false;
221
}
222
*new_server = (server){ .ip = strdup(ip),
223
.port = port,
224
.if_index = if_index,
225
.af = af };
226
if(new_server->ip == NULL){
227
perror_plus("strdup");
228
return false;
229
}
230
/* Special case of first server */
231
if (mc.current_server == NULL){
232
new_server->next = new_server;
233
new_server->prev = new_server;
234
mc.current_server = new_server;
235
/* Place the new server last in the list */
236
} else {
237
new_server->next = mc.current_server;
238
new_server->prev = mc.current_server->prev;
239
new_server->prev->next = new_server;
240
mc.current_server->prev = new_server;
241
}
242
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
243
if(ret == -1){
244
perror_plus("clock_gettime");
245
return false;
246
}
247
return true;
248
}
249
250
165
/*
251
166
* Initialize GPGME.
252
167
*/
253
static bool init_gpgme(const char *seckey, const char *pubkey,
254
const char *tempdir){
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
255
170
gpgme_error_t rc;
256
171
gpgme_engine_info_t engine_info;
257
172
266
181
267
182
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
268
183
if(fd == -1){
269
perror_plus("open");
184
perror("open");
270
185
return false;
271
186
}
272
187
273
188
rc = gpgme_data_new_from_fd(&pgp_data, fd);
274
189
if(rc != GPG_ERR_NO_ERROR){
275
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
276
gpgme_strsource(rc), gpgme_strerror(rc));
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
277
192
return false;
278
193
}
279
194
280
195
rc = gpgme_op_import(mc.ctx, pgp_data);
281
196
if(rc != GPG_ERR_NO_ERROR){
282
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
284
199
return false;
285
200
}
286
201
287
202
ret = (int)TEMP_FAILURE_RETRY(close(fd));
288
203
if(ret == -1){
289
perror_plus("close");
204
perror("close");
290
205
}
291
206
gpgme_data_release(pgp_data);
292
207
return true;
293
208
}
294
209
295
210
if(debug){
296
fprintf_plus(stderr, "Initializing GPGME\n");
211
fprintf(stderr, "Initializing GPGME\n");
297
212
}
298
213
299
214
/* Init GPGME */
300
215
gpgme_check_version(NULL);
301
216
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
302
217
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
305
220
return false;
306
221
}
307
222
308
/* Set GPGME home directory for the OpenPGP engine only */
223
/* Set GPGME home directory for the OpenPGP engine only */
309
224
rc = gpgme_get_engine_info(&engine_info);
310
225
if(rc != GPG_ERR_NO_ERROR){
311
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
312
gpgme_strsource(rc), gpgme_strerror(rc));
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
313
228
return false;
314
229
}
315
230
while(engine_info != NULL){
321
236
engine_info = engine_info->next;
322
237
}
323
238
if(engine_info == NULL){
324
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
325
tempdir);
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
326
240
return false;
327
241
}
328
242
329
243
/* Create new GPGME "context" */
330
244
rc = gpgme_new(&(mc.ctx));
331
245
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "Mandos plugin mandos-client: "
333
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
334
gpgme_strerror(rc));
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
335
248
return false;
336
249
}
337
250
356
269
ssize_t plaintext_length = 0;
357
270
358
271
if(debug){
359
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
360
273
}
361
274
362
275
/* Create new GPGME data buffer from memory cryptotext */
363
276
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
364
277
0);
365
278
if(rc != GPG_ERR_NO_ERROR){
366
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
368
281
return -1;
369
282
}
370
283
371
284
/* Create new empty GPGME data buffer for the plaintext */
372
285
rc = gpgme_data_new(&dh_plain);
373
286
if(rc != GPG_ERR_NO_ERROR){
374
fprintf_plus(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_data_new: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
377
289
gpgme_data_release(dh_crypto);
378
290
return -1;
379
291
}
382
294
data buffer */
383
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
384
296
if(rc != GPG_ERR_NO_ERROR){
385
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
386
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
387
299
plaintext_length = -1;
388
300
if(debug){
389
301
gpgme_decrypt_result_t result;
390
302
result = gpgme_op_decrypt_result(mc.ctx);
391
303
if(result == NULL){
392
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
393
305
} else {
394
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
395
result->unsupported_algorithm);
396
fprintf_plus(stderr, "Wrong key usage: %u\n",
397
result->wrong_key_usage);
306
fprintf(stderr, "Unsupported algorithm: %s\n",
307
result->unsupported_algorithm);
308
fprintf(stderr, "Wrong key usage: %u\n",
309
result->wrong_key_usage);
398
310
if(result->file_name != NULL){
399
fprintf_plus(stderr, "File name: %s\n", result->file_name);
311
fprintf(stderr, "File name: %s\n", result->file_name);
400
312
}
401
313
gpgme_recipient_t recipient;
402
314
recipient = result->recipients;
403
315
while(recipient != NULL){
404
fprintf_plus(stderr, "Public key algorithm: %s\n",
405
gpgme_pubkey_algo_name
406
(recipient->pubkey_algo));
407
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
408
fprintf_plus(stderr, "Secret key available: %s\n",
409
recipient->status == GPG_ERR_NO_SECKEY
410
? "No" : "Yes");
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
411
322
recipient = recipient->next;
412
323
}
413
324
}
416
327
}
417
328
418
329
if(debug){
419
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
420
331
}
421
332
422
333
/* Seek back to the beginning of the GPGME plaintext data buffer */
423
334
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
424
perror_plus("gpgme_data_seek");
335
perror("gpgme_data_seek");
425
336
plaintext_length = -1;
426
337
goto decrypt_end;
427
338
}
429
340
*plaintext = NULL;
430
341
while(true){
431
342
plaintext_capacity = incbuffer(plaintext,
432
(size_t)plaintext_length,
433
plaintext_capacity);
343
(size_t)plaintext_length,
344
plaintext_capacity);
434
345
if(plaintext_capacity == 0){
435
perror_plus("incbuffer");
436
plaintext_length = -1;
437
goto decrypt_end;
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
438
349
}
439
350
440
351
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
445
356
break;
446
357
}
447
358
if(ret < 0){
448
perror_plus("gpgme_data_read");
359
perror("gpgme_data_read");
449
360
plaintext_length = -1;
450
361
goto decrypt_end;
451
362
}
453
364
}
454
365
455
366
if(debug){
456
fprintf_plus(stderr, "Decrypted password is: ");
367
fprintf(stderr, "Decrypted password is: ");
457
368
for(ssize_t i = 0; i < plaintext_length; i++){
458
369
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
459
370
}
481
392
/* GnuTLS log function callback */
482
393
static void debuggnutls(__attribute__((unused)) int level,
483
394
const char* string){
484
fprintf_plus(stderr, "GnuTLS: %s", string);
395
fprintf(stderr, "GnuTLS: %s", string);
485
396
}
486
397
487
398
static int init_gnutls_global(const char *pubkeyfilename,
489
400
int ret;
490
401
491
402
if(debug){
492
fprintf_plus(stderr, "Initializing GnuTLS\n");
403
fprintf(stderr, "Initializing GnuTLS\n");
493
404
}
494
405
495
406
ret = gnutls_global_init();
496
407
if(ret != GNUTLS_E_SUCCESS){
497
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
498
safer_gnutls_strerror(ret));
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
499
410
return -1;
500
411
}
501
412
508
419
}
509
420
510
421
/* OpenPGP credentials */
511
ret = gnutls_certificate_allocate_credentials(&mc.cred);
422
gnutls_certificate_allocate_credentials(&mc.cred);
512
423
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
514
safer_gnutls_strerror(ret));
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
515
429
gnutls_global_deinit();
516
430
return -1;
517
431
}
518
432
519
433
if(debug){
520
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n",
522
pubkeyfilename,
523
seckeyfilename);
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
524
437
}
525
438
526
439
ret = gnutls_certificate_set_openpgp_key_file
527
440
(mc.cred, pubkeyfilename, seckeyfilename,
528
441
GNUTLS_OPENPGP_FMT_BASE64);
529
442
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr,
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
534
safer_gnutls_strerror(ret));
443
fprintf(stderr,
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
fprintf(stderr, "The GnuTLS error is: %s\n",
447
safer_gnutls_strerror(ret));
535
448
goto globalfail;
536
449
}
537
450
538
451
/* GnuTLS server initialization */
539
452
ret = gnutls_dh_params_init(&mc.dh_params);
540
453
if(ret != GNUTLS_E_SUCCESS){
541
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
542
" initialization: %s\n",
543
safer_gnutls_strerror(ret));
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
544
456
goto globalfail;
545
457
}
546
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
459
if(ret != GNUTLS_E_SUCCESS){
548
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
550
462
goto globalfail;
551
463
}
552
464
572
484
}
573
485
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
486
if(ret != GNUTLS_E_SUCCESS){
575
fprintf_plus(stderr,
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
578
489
}
579
490
580
491
{
587
498
}
588
499
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
500
if(ret != GNUTLS_E_SUCCESS){
590
fprintf_plus(stderr, "Syntax error at: %s\n", err);
591
fprintf_plus(stderr, "GnuTLS error: %s\n",
592
safer_gnutls_strerror(ret));
501
fprintf(stderr, "Syntax error at: %s\n", err);
502
fprintf(stderr, "GnuTLS error: %s\n",
503
safer_gnutls_strerror(ret));
593
504
gnutls_deinit(*session);
594
505
return -1;
595
506
}
604
515
}
605
516
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
606
517
if(ret != GNUTLS_E_SUCCESS){
607
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
608
safer_gnutls_strerror(ret));
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
609
520
gnutls_deinit(*session);
610
521
return -1;
611
522
}
641
552
gnutls_session_t session;
642
553
int pf; /* Protocol family */
643
554
644
errno = 0;
645
646
555
if(quit_now){
647
errno = EINTR;
648
556
return -1;
649
557
}
650
558
656
564
pf = PF_INET;
657
565
break;
658
566
default:
659
fprintf_plus(stderr, "Bad address family: %d\n", af);
660
errno = EINVAL;
567
fprintf(stderr, "Bad address family: %d\n", af);
661
568
return -1;
662
569
}
663
570
667
574
}
668
575
669
576
if(debug){
670
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
671
PRIu16 "\n", ip, port);
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
672
579
}
673
580
674
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
675
582
if(tcp_sd < 0){
676
int e = errno;
677
perror_plus("socket");
678
errno = e;
583
perror("socket");
679
584
goto mandos_end;
680
585
}
681
586
682
587
if(quit_now){
683
errno = EINTR;
684
588
goto mandos_end;
685
589
}
686
590
693
597
ret = inet_pton(af, ip, &to.in.sin_addr);
694
598
}
695
599
if(ret < 0 ){
696
int e = errno;
697
perror_plus("inet_pton");
698
errno = e;
600
perror("inet_pton");
699
601
goto mandos_end;
700
602
}
701
603
if(ret == 0){
702
int e = errno;
703
fprintf_plus(stderr, "Bad address: %s\n", ip);
704
errno = e;
604
fprintf(stderr, "Bad address: %s\n", ip);
705
605
goto mandos_end;
706
606
}
707
607
if(af == AF_INET6){
711
611
712
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
713
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
714
-Wunreachable-code*/
614
-Wunreachable-code*/
715
615
if(if_index == AVAHI_IF_UNSPEC){
716
fprintf_plus(stderr, "An IPv6 link-local address is"
717
" incomplete without a network interface\n");
718
errno = EINVAL;
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
719
618
goto mandos_end;
720
619
}
721
620
/* Set the network interface number as scope */
728
627
}
729
628
730
629
if(quit_now){
731
errno = EINTR;
732
630
goto mandos_end;
733
631
}
734
632
736
634
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
737
635
char interface[IF_NAMESIZE];
738
636
if(if_indextoname((unsigned int)if_index, interface) == NULL){
739
perror_plus("if_indextoname");
637
perror("if_indextoname");
740
638
} else {
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
743
641
}
744
642
} else {
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
746
ip, port);
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
747
645
}
748
646
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
749
647
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
756
654
sizeof(addrstr));
757
655
}
758
656
if(pcret == NULL){
759
perror_plus("inet_ntop");
657
perror("inet_ntop");
760
658
} else {
761
659
if(strcmp(addrstr, ip) != 0){
762
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
763
661
}
764
662
}
765
663
}
766
664
767
665
if(quit_now){
768
errno = EINTR;
769
666
goto mandos_end;
770
667
}
771
668
775
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
776
673
}
777
674
if(ret < 0){
778
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
779
int e = errno;
780
perror_plus("connect");
781
errno = e;
782
}
675
perror("connect");
783
676
goto mandos_end;
784
677
}
785
678
786
679
if(quit_now){
787
errno = EINTR;
788
680
goto mandos_end;
789
681
}
790
682
793
685
while(true){
794
686
size_t out_size = strlen(out);
795
687
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
796
out_size - written));
688
out_size - written));
797
689
if(ret == -1){
798
int e = errno;
799
perror_plus("write");
800
errno = e;
690
perror("write");
801
691
goto mandos_end;
802
692
}
803
693
written += (size_t)ret;
813
703
}
814
704
815
705
if(quit_now){
816
errno = EINTR;
817
706
goto mandos_end;
818
707
}
819
708
}
820
709
821
710
if(debug){
822
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
823
712
}
824
713
825
714
if(quit_now){
826
errno = EINTR;
827
715
goto mandos_end;
828
716
}
829
717
830
/* This casting via intptr_t is to eliminate warning about casting
831
an int to a pointer type. This is exactly how the GnuTLS Guile
832
function "set-session-transport-fd!" does it. */
833
gnutls_transport_set_ptr(session,
834
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
835
719
836
720
if(quit_now){
837
errno = EINTR;
838
721
goto mandos_end;
839
722
}
840
723
841
724
do {
842
725
ret = gnutls_handshake(session);
843
726
if(quit_now){
844
errno = EINTR;
845
727
goto mandos_end;
846
728
}
847
729
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
848
730
849
731
if(ret != GNUTLS_E_SUCCESS){
850
732
if(debug){
851
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
852
734
gnutls_perror(ret);
853
735
}
854
errno = EPROTO;
855
736
goto mandos_end;
856
737
}
857
738
858
739
/* Read OpenPGP packet that contains the wanted password */
859
740
860
741
if(debug){
861
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
862
" %s\n", ip);
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
863
744
}
864
745
865
746
while(true){
866
747
867
748
if(quit_now){
868
errno = EINTR;
869
749
goto mandos_end;
870
750
}
871
751
872
752
buffer_capacity = incbuffer(&buffer, buffer_length,
873
buffer_capacity);
753
buffer_capacity);
874
754
if(buffer_capacity == 0){
875
int e = errno;
876
perror_plus("incbuffer");
877
errno = e;
755
perror("incbuffer");
878
756
goto mandos_end;
879
757
}
880
758
881
759
if(quit_now){
882
errno = EINTR;
883
760
goto mandos_end;
884
761
}
885
762
898
775
ret = gnutls_handshake(session);
899
776
900
777
if(quit_now){
901
errno = EINTR;
902
778
goto mandos_end;
903
779
}
904
780
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
905
781
if(ret < 0){
906
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
907
"***\n");
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
908
783
gnutls_perror(ret);
909
errno = EPROTO;
910
784
goto mandos_end;
911
785
}
912
786
break;
913
787
default:
914
fprintf_plus(stderr, "Unknown error while reading data from"
915
" encrypted session with Mandos server\n");
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
916
790
gnutls_bye(session, GNUTLS_SHUT_RDWR);
917
errno = EIO;
918
791
goto mandos_end;
919
792
}
920
793
} else {
923
796
}
924
797
925
798
if(debug){
926
fprintf_plus(stderr, "Closing TLS session\n");
799
fprintf(stderr, "Closing TLS session\n");
927
800
}
928
801
929
802
if(quit_now){
930
errno = EINTR;
931
803
goto mandos_end;
932
804
}
933
805
934
806
do {
935
807
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
936
808
if(quit_now){
937
errno = EINTR;
938
809
goto mandos_end;
939
810
}
940
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
941
812
942
813
if(buffer_length > 0){
943
814
ssize_t decrypted_buffer_size;
944
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
945
817
&decrypted_buffer);
946
818
if(decrypted_buffer_size >= 0){
947
819
948
820
written = 0;
949
821
while(written < (size_t) decrypted_buffer_size){
950
822
if(quit_now){
951
errno = EINTR;
952
823
goto mandos_end;
953
824
}
954
825
956
827
(size_t)decrypted_buffer_size - written,
957
828
stdout);
958
829
if(ret == 0 and ferror(stdout)){
959
int e = errno;
960
830
if(debug){
961
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
962
strerror(errno));
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
963
833
}
964
errno = e;
965
834
goto mandos_end;
966
835
}
967
836
written += (size_t)ret;
973
842
/* Shutdown procedure */
974
843
975
844
mandos_end:
976
{
977
int e = errno;
978
free(decrypted_buffer);
979
free(buffer);
980
if(tcp_sd >= 0){
981
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
982
}
983
if(ret == -1){
984
if(e == 0){
985
e = errno;
986
}
987
perror_plus("close");
988
}
989
gnutls_deinit(session);
990
errno = e;
991
if(quit_now){
992
errno = EINTR;
993
retval = -1;
994
}
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;
995
856
}
996
857
return retval;
997
858
}
1022
883
switch(event){
1023
884
default:
1024
885
case AVAHI_RESOLVER_FAILURE:
1025
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1026
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1027
domain,
1028
avahi_strerror(avahi_server_errno(mc.server)));
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
888
avahi_strerror(avahi_server_errno(mc.server)));
1029
889
break;
1030
890
1031
891
case AVAHI_RESOLVER_FOUND:
1033
893
char ip[AVAHI_ADDRESS_STR_MAX];
1034
894
avahi_address_snprint(ip, sizeof(ip), address);
1035
895
if(debug){
1036
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1037
PRIdMAX ") on port %" PRIu16 "\n", name,
1038
host_name, ip, (intmax_t)interface, port);
896
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
ip, (intmax_t)interface, port);
1039
899
}
1040
900
int ret = start_mandos_communication(ip, port, interface,
1041
901
avahi_proto_to_af(proto));
1042
902
if(ret == 0){
1043
903
avahi_simple_poll_quit(mc.simple_poll);
1044
} else {
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1047
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1048
" list\n", name);
1049
}
1050
904
}
1051
905
}
1052
906
}
1076
930
default:
1077
931
case AVAHI_BROWSER_FAILURE:
1078
932
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
1081
935
avahi_simple_poll_quit(mc.simple_poll);
1082
936
return;
1083
937
1090
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
945
name, type, domain, protocol, 0,
1092
946
resolve_callback, NULL) == NULL)
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
1096
949
break;
1097
950
1098
951
case AVAHI_BROWSER_REMOVE:
1101
954
case AVAHI_BROWSER_ALL_FOR_NOW:
1102
955
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1103
956
if(debug){
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1106
958
}
1107
959
break;
1108
960
}
1109
961
}
1110
962
1111
/* Signal handler that stops main loop after SIGTERM */
963
/* stop main loop after sigterm has been called */
1112
964
static void handle_sigterm(int sig){
1113
965
if(quit_now){
1114
966
return;
1116
968
quit_now = 1;
1117
969
signal_received = sig;
1118
970
int old_errno = errno;
1119
/* set main loop to exit */
1120
971
if(mc.simple_poll != NULL){
1121
972
avahi_simple_poll_quit(mc.simple_poll);
1122
973
}
1123
974
errno = old_errno;
1124
975
}
1125
976
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
perror_plus("scandir");
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1461
perror_plus("asprintf");
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
free(delaystring);
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
1532
} else {
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
1569
}
1570
1571
error_t bring_up_interface(const char *const interface,
1572
const float delay){
1573
int sd = -1;
1574
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
1577
struct ifreq network;
1578
unsigned int if_index = if_nametoindex(interface);
1579
if(if_index == 0){
1580
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1581
errno = old_errno;
1582
return ENXIO;
1583
}
1584
1585
if(quit_now){
1586
errno = old_errno;
1587
return EINTR;
1588
}
1589
1590
if(not interface_is_up(interface)){
1591
if(not get_flags(interface, &network) and debug){
1592
ret_errno = errno;
1593
fprintf_plus(stderr, "Failed to get flags for interface "
1594
"\"%s\"\n", interface);
1595
return ret_errno;
1596
}
1597
network.ifr_flags |= IFF_UP;
1598
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
1601
ret_errno = errno;
1602
perror_plus("socket");
1603
errno = old_errno;
1604
return ret_errno;
1605
}
1606
1607
if(quit_now){
1608
close(sd);
1609
errno = old_errno;
1610
return EINTR;
1611
}
1612
1613
if(debug){
1614
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1615
interface);
1616
}
1617
1618
/* Raise priviliges */
1619
raise_privileges();
1620
1621
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
1629
}
1630
#endif /* __linux__ */
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
1633
#ifdef __linux__
1634
if(restore_loglevel){
1635
ret_linux = klogctl(7, NULL, 0);
1636
if(ret_linux == -1){
1637
perror_plus("klogctl");
1638
}
1639
}
1640
#endif /* __linux__ */
1641
1642
/* Lower privileges */
1643
lower_privileges();
1644
1645
/* Close the socket */
1646
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1647
if(ret == -1){
1648
perror_plus("close");
1649
}
1650
1651
if(ret_setflags == -1){
1652
errno = ret_errno;
1653
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1654
errno = old_errno;
1655
return ret_errno;
1656
}
1657
} else if(debug){
1658
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1659
interface);
1660
}
1661
1662
/* Sleep checking until interface is running.
1663
Check every 0.25s, up to total time of delay */
1664
for(int i=0; i < delay * 4; i++){
1665
if(interface_is_running(interface)){
1666
break;
1667
}
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1672
}
1673
}
1674
1675
errno = old_errno;
1676
return 0;
1677
}
1678
1679
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
if(interface_is_up(interface)){
1692
if(not get_flags(interface, &network) and debug){
1693
ret_errno = errno;
1694
fprintf_plus(stderr, "Failed to get flags for interface "
1695
"\"%s\"\n", interface);
1696
return ret_errno;
1697
}
1698
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1699
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
1702
ret_errno = errno;
1703
perror_plus("socket");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
1708
if(debug){
1709
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1710
interface);
1711
}
1712
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
1721
1722
/* Close the socket */
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1724
if(ret == -1){
1725
perror_plus("close");
1726
}
1727
1728
if(ret_setflags == -1){
1729
errno = ret_errno;
1730
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
} else if(debug){
1735
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1736
interface);
1737
}
1738
1739
errno = old_errno;
1740
return 0;
1741
}
1742
1743
977
int main(int argc, char *argv[]){
1744
978
AvahiSServiceBrowser *sb = NULL;
1745
error_t ret_errno;
979
int error;
1746
980
int ret;
1747
981
intmax_t tmpmax;
1748
982
char *tmp;
1749
983
int exitcode = EXIT_SUCCESS;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1752
char *interfaces_to_take_down = NULL;
1753
size_t interfaces_to_take_down_size = 0;
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;
1754
991
char tempdir[] = "/tmp/mandosXXXXXX";
1755
992
bool tempdir_created = false;
1756
993
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1757
994
const char *seckey = PATHDIR "/" SECKEY;
1758
995
const char *pubkey = PATHDIR "/" PUBKEY;
1759
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
1761
996
1762
997
bool gnutls_initialized = false;
1763
998
bool gpgme_initialized = false;
1764
999
float delay = 2.5f;
1765
double retry_interval = 10; /* 10s between trying a server and
1766
retrying the same server again */
1767
1000
1768
1001
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1769
1002
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1775
1008
errno = 0;
1776
1009
ret = setgid(gid);
1777
1010
if(ret == -1){
1778
perror_plus("setgid");
1011
perror("setgid");
1779
1012
}
1780
1013
1781
1014
/* Lower user privileges (temporarily) */
1782
1015
errno = 0;
1783
1016
ret = seteuid(uid);
1784
1017
if(ret == -1){
1785
perror_plus("seteuid");
1018
perror("seteuid");
1786
1019
}
1787
1020
1788
1021
if(quit_now){
1823
1056
.arg = "SECONDS",
1824
1057
.doc = "Maximum delay to wait for interface startup",
1825
1058
.group = 2 },
1826
{ .name = "retry", .key = 132,
1827
.arg = "SECONDS",
1828
.doc = "Retry interval used when denied by the Mandos server",
1829
.group = 2 },
1830
{ .name = "network-hook-dir", .key = 133,
1831
.arg = "DIR",
1832
.doc = "Directory where network hooks are located",
1833
.group = 2 },
1834
/*
1835
* These reproduce what we would get without ARGP_NO_HELP
1836
*/
1837
{ .name = "help", .key = '?',
1838
.doc = "Give this help list", .group = -1 },
1839
{ .name = "usage", .key = -3,
1840
.doc = "Give a short usage message", .group = -1 },
1841
{ .name = "version", .key = 'V',
1842
.doc = "Print program version", .group = -1 },
1843
1059
{ .name = NULL }
1844
1060
};
1845
1061
1846
1062
error_t parse_opt(int key, char *arg,
1847
1063
struct argp_state *state){
1848
errno = 0;
1849
1064
switch(key){
1850
1065
case 128: /* --debug */
1851
1066
debug = true;
1854
1069
connect_to = arg;
1855
1070
break;
1856
1071
case 'i': /* --interface */
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
1859
if(ret_errno != 0){
1860
argp_error(state, "%s", strerror(ret_errno));
1861
}
1072
interface = arg;
1862
1073
break;
1863
1074
case 's': /* --seckey */
1864
1075
seckey = arg;
1871
1082
tmpmax = strtoimax(arg, &tmp, 10);
1872
1083
if(errno != 0 or tmp == arg or *tmp != '\0'
1873
1084
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1874
argp_error(state, "Bad number of DH bits");
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
1875
1087
}
1876
1088
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1877
1089
break;
1882
1094
errno = 0;
1883
1095
delay = strtof(arg, &tmp);
1884
1096
if(errno != 0 or tmp == arg or *tmp != '\0'){
1885
argp_error(state, "Bad delay");
1886
}
1887
case 132: /* --retry */
1888
errno = 0;
1889
retry_interval = strtod(arg, &tmp);
1890
if(errno != 0 or tmp == arg or *tmp != '\0'
1891
or (retry_interval * 1000) > INT_MAX
1892
or retry_interval < 0){
1893
argp_error(state, "Bad retry interval");
1894
}
1895
break;
1896
case 133: /* --network-hook-dir */
1897
hookdir = arg;
1898
break;
1899
/*
1900
* These reproduce what we would get without ARGP_NO_HELP
1901
*/
1902
case '?': /* --help */
1903
argp_state_help(state, state->out_stream,
1904
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1905
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1906
case -3: /* --usage */
1907
argp_state_help(state, state->out_stream,
1908
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1909
case 'V': /* --version */
1910
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1911
exit(argp_err_exit_status);
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
1912
1104
break;
1913
1105
default:
1914
1106
return ARGP_ERR_UNKNOWN;
1915
1107
}
1916
return errno;
1108
return 0;
1917
1109
}
1918
1110
1919
1111
struct argp argp = { .options = options, .parser = parse_opt,
1920
1112
.args_doc = "",
1921
1113
.doc = "Mandos client -- Get and decrypt"
1922
1114
" passwords from a Mandos server" };
1923
ret = argp_parse(&argp, argc, argv,
1924
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1925
switch(ret){
1926
case 0:
1927
break;
1928
case ENOMEM:
1929
default:
1930
errno = ret;
1931
perror_plus("argp_parse");
1932
exitcode = EX_OSERR;
1933
goto end;
1934
case EINVAL:
1935
exitcode = EX_USAGE;
1936
goto end;
1937
}
1938
}
1939
1940
{
1941
/* Work around Debian bug #633582:
1942
<http://bugs.debian.org/633582> */
1943
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
1946
struct stat st;
1947
1948
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1949
int seckey_fd = open(seckey, O_RDONLY);
1950
if(seckey_fd == -1){
1951
perror_plus("open");
1952
} else {
1953
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1954
if(ret == -1){
1955
perror_plus("fstat");
1956
} else {
1957
if(S_ISREG(st.st_mode)
1958
and st.st_uid == 0 and st.st_gid == 0){
1959
ret = fchown(seckey_fd, uid, gid);
1960
if(ret == -1){
1961
perror_plus("fchown");
1962
}
1963
}
1964
}
1965
TEMP_FAILURE_RETRY(close(seckey_fd));
1966
}
1967
}
1968
1969
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1970
int pubkey_fd = open(pubkey, O_RDONLY);
1971
if(pubkey_fd == -1){
1972
perror_plus("open");
1973
} else {
1974
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1975
if(ret == -1){
1976
perror_plus("fstat");
1977
} else {
1978
if(S_ISREG(st.st_mode)
1979
and st.st_uid == 0 and st.st_gid == 0){
1980
ret = fchown(pubkey_fd, uid, gid);
1981
if(ret == -1){
1982
perror_plus("fchown");
1983
}
1984
}
1985
}
1986
TEMP_FAILURE_RETRY(close(pubkey_fd));
1987
}
1988
}
1989
1990
/* Lower privileges */
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
1995
}
1996
}
1997
}
1998
1999
/* Remove empty interface names */
2000
{
2001
char *interface = NULL;
2002
while((interface = argz_next(interfaces, interfaces_size,
2003
interface))){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2006
fprintf_plus(stderr, "Not using nonexisting interface"
2007
" \"%s\"\n", interface);
2008
}
2009
argz_delete(&interfaces, &interfaces_size, interface);
2010
interface = NULL;
2011
}
2012
}
2013
}
2014
2015
/* Run network hooks */
2016
{
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
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;
2026
1119
goto end;
2027
1120
}
2028
1121
}
2037
1130
srand((unsigned int) time(NULL));
2038
1131
mc.simple_poll = avahi_simple_poll_new();
2039
1132
if(mc.simple_poll == NULL){
2040
fprintf_plus(stderr,
2041
"Avahi: Failed to create simple poll object.\n");
2042
exitcode = EX_UNAVAILABLE;
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
2043
1135
goto end;
2044
1136
}
2045
1137
2046
1138
sigemptyset(&sigterm_action.sa_mask);
2047
1139
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2048
1140
if(ret == -1){
2049
perror_plus("sigaddset");
2050
exitcode = EX_OSERR;
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
2051
1143
goto end;
2052
1144
}
2053
1145
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2054
1146
if(ret == -1){
2055
perror_plus("sigaddset");
2056
exitcode = EX_OSERR;
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
2057
1149
goto end;
2058
1150
}
2059
1151
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2060
1152
if(ret == -1){
2061
perror_plus("sigaddset");
2062
exitcode = EX_OSERR;
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
2063
1155
goto end;
2064
1156
}
2065
1157
/* Need to check if the handler is SIG_IGN before handling:
2068
1160
*/
2069
1161
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2070
1162
if(ret == -1){
2071
perror_plus("sigaction");
2072
return EX_OSERR;
1163
perror("sigaction");
1164
return EXIT_FAILURE;
2073
1165
}
2074
1166
if(old_sigterm_action.sa_handler != SIG_IGN){
2075
1167
ret = sigaction(SIGINT, &sigterm_action, NULL);
2076
1168
if(ret == -1){
2077
perror_plus("sigaction");
2078
exitcode = EX_OSERR;
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
2079
1171
goto end;
2080
1172
}
2081
1173
}
2082
1174
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2083
1175
if(ret == -1){
2084
perror_plus("sigaction");
2085
return EX_OSERR;
1176
perror("sigaction");
1177
return EXIT_FAILURE;
2086
1178
}
2087
1179
if(old_sigterm_action.sa_handler != SIG_IGN){
2088
1180
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2089
1181
if(ret == -1){
2090
perror_plus("sigaction");
2091
exitcode = EX_OSERR;
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
2092
1184
goto end;
2093
1185
}
2094
1186
}
2095
1187
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2096
1188
if(ret == -1){
2097
perror_plus("sigaction");
2098
return EX_OSERR;
1189
perror("sigaction");
1190
return EXIT_FAILURE;
2099
1191
}
2100
1192
if(old_sigterm_action.sa_handler != SIG_IGN){
2101
1193
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2102
1194
if(ret == -1){
2103
perror_plus("sigaction");
2104
exitcode = EX_OSERR;
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
2105
1197
goto end;
2106
1198
}
2107
1199
}
2108
1200
2109
/* If no interfaces were specified, make a list */
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2112
/* Look for any good interfaces */
2113
ret = scandir(sys_class_net, &direntries, good_interface,
2114
alphasort);
2115
if(ret >= 1){
2116
/* Add all found interfaces to interfaces list */
2117
for(int i = 0; i < ret; ++i){
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2119
direntries[i]->d_name);
2120
if(ret_errno != 0){
2121
perror_plus("argz_add");
2122
continue;
2123
}
2124
if(debug){
2125
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2126
direntries[i]->d_name);
2127
}
2128
}
2129
free(direntries);
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
}
2130
1336
} else {
2131
free(direntries);
2132
fprintf_plus(stderr, "Could not find a network interface\n");
2133
exitcode = EXIT_FAILURE;
2134
goto end;
2135
}
2136
}
2137
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2150
char *interface = NULL;
2151
while((interface = argz_next(interfaces, interfaces_size,
2152
interface))){
2153
bool interface_was_up = interface_is_up(interface);
2154
ret = bring_up_interface(interface, delay);
2155
if(not interface_was_up){
2156
if(ret != 0){
2157
errno = ret;
2158
perror_plus("Failed to bring up interface");
2159
} else {
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2163
}
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
2164
1341
}
2165
1342
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2169
if(debug and (interfaces_to_take_down == NULL)){
2170
fprintf_plus(stderr, "No interfaces were brought up\n");
2171
}
2172
1343
}
2173
1344
2174
1345
if(quit_now){
2177
1348
2178
1349
ret = init_gnutls_global(pubkey, seckey);
2179
1350
if(ret == -1){
2180
fprintf_plus(stderr, "init_gnutls_global failed\n");
2181
exitcode = EX_UNAVAILABLE;
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2182
1353
goto end;
2183
1354
} else {
2184
1355
gnutls_initialized = true;
2188
1359
goto end;
2189
1360
}
2190
1361
1362
tempdir_created = true;
2191
1363
if(mkdtemp(tempdir) == NULL){
2192
perror_plus("mkdtemp");
1364
tempdir_created = false;
1365
perror("mkdtemp");
2193
1366
goto end;
2194
1367
}
2195
tempdir_created = true;
2196
1368
2197
1369
if(quit_now){
2198
1370
goto end;
2199
1371
}
2200
1372
2201
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
2202
fprintf_plus(stderr, "init_gpgme failed\n");
2203
exitcode = EX_UNAVAILABLE;
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2204
1376
goto end;
2205
1377
} else {
2206
1378
gpgme_initialized = true;
2214
1386
/* Connect directly, do not use Zeroconf */
2215
1387
/* (Mainly meant for debugging) */
2216
1388
char *address = strrchr(connect_to, ':');
2217
2218
1389
if(address == NULL){
2219
fprintf_plus(stderr, "No colon in address\n");
2220
exitcode = EX_USAGE;
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2221
1392
goto end;
2222
1393
}
2223
1394
2230
1401
tmpmax = strtoimax(address+1, &tmp, 10);
2231
1402
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2232
1403
or tmpmax != (uint16_t)tmpmax){
2233
fprintf_plus(stderr, "Bad port number\n");
2234
exitcode = EX_USAGE;
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2235
1406
goto end;
2236
1407
}
2237
1408
2241
1412
2242
1413
port = (uint16_t)tmpmax;
2243
1414
*address = '\0';
1415
address = connect_to;
2244
1416
/* Colon in address indicates IPv6 */
2245
1417
int af;
2246
if(strchr(connect_to, ':') != NULL){
1418
if(strchr(address, ':') != NULL){
2247
1419
af = AF_INET6;
2248
/* Accept [] around IPv6 address - see RFC 5952 */
2249
if(connect_to[0] == '[' and address[-1] == ']')
2250
{
2251
connect_to++;
2252
address[-1] = '\0';
2253
}
2254
1420
} else {
2255
1421
af = AF_INET;
2256
1422
}
2257
address = connect_to;
2258
1423
2259
1424
if(quit_now){
2260
1425
goto end;
2261
1426
}
2262
1427
2263
while(not quit_now){
2264
ret = start_mandos_communication(address, port, if_index, af);
2265
if(quit_now or ret == 0){
2266
break;
2267
}
2268
if(debug){
2269
fprintf_plus(stderr, "Retrying in %d seconds\n",
2270
(int)retry_interval);
2271
}
2272
sleep((int)retry_interval);
2273
}
2274
2275
if (not quit_now){
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2276
1432
exitcode = EXIT_SUCCESS;
2277
1433
}
2278
2279
1434
goto end;
2280
1435
}
2281
1436
2295
1450
/* Allocate a new server */
2296
1451
mc.server = avahi_server_new(avahi_simple_poll_get
2297
1452
(mc.simple_poll), &config, NULL,
2298
NULL, &ret_errno);
1453
NULL, &error);
2299
1454
2300
1455
/* Free the Avahi configuration data */
2301
1456
avahi_server_config_free(&config);
2303
1458
2304
1459
/* Check if creating the Avahi server object succeeded */
2305
1460
if(mc.server == NULL){
2306
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2307
avahi_strerror(ret_errno));
2308
exitcode = EX_UNAVAILABLE;
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
2309
1464
goto end;
2310
1465
}
2311
1466
2318
1473
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2319
1474
NULL, 0, browse_callback, NULL);
2320
1475
if(sb == NULL){
2321
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
avahi_strerror(avahi_server_errno(mc.server)));
2323
exitcode = EX_UNAVAILABLE;
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
2324
1479
goto end;
2325
1480
}
2326
1481
2331
1486
/* Run the main loop */
2332
1487
2333
1488
if(debug){
2334
fprintf_plus(stderr, "Starting Avahi loop search\n");
2335
}
2336
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2339
if(debug){
2340
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2341
(ret == 0) ? "successfully" : "with error");
2342
}
1489
fprintf(stderr, "Starting Avahi loop search\n");
1490
}
1491
1492
avahi_simple_poll_loop(mc.simple_poll);
2343
1493
2344
1494
end:
2345
1495
2346
1496
if(debug){
2347
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1497
fprintf(stderr, "%s exiting\n", argv[0]);
2348
1498
}
2349
1499
2350
1500
/* Cleanup things */
2367
1517
gpgme_release(mc.ctx);
2368
1518
}
2369
1519
2370
/* Cleans up the circular linked list of Mandos servers the client
2371
has seen */
2372
if(mc.current_server != NULL){
2373
mc.current_server->prev->next = NULL;
2374
while(mc.current_server != NULL){
2375
server *next = mc.current_server->next;
2376
free(mc.current_server);
2377
mc.current_server = next;
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
2378
1527
}
2379
}
2380
2381
/* Re-raise priviliges */
2382
{
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
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");
2398
1537
}
2399
1538
}
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
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");
2403
1548
}
2404
1549
}
2405
2406
lower_privileges_permanently();
2407
1550
}
2408
1551
2409
free(interfaces_to_take_down);
2410
free(interfaces_hooks);
2411
2412
/* Removes the GPGME temp directory and all files inside */
1552
/* Removes the temp directory used by GPGME */
2413
1553
if(tempdir_created){
2414
struct dirent **direntries = NULL;
2415
struct dirent *direntry = NULL;
2416
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
alphasort);
2418
if (numentries > 0){
2419
for(int i = 0; i < numentries; i++){
2420
direntry = direntries[i];
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1559
perror("opendir");
1560
}
1561
} else {
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
2421
1574
char *fullname = NULL;
2422
1575
ret = asprintf(&fullname, "%s/%s", tempdir,
2423
1576
direntry->d_name);
2424
1577
if(ret < 0){
2425
perror_plus("asprintf");
1578
perror("asprintf");
2426
1579
continue;
2427
1580
}
2428
1581
ret = remove(fullname);
2429
1582
if(ret == -1){
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
2432
1585
}
2433
1586
free(fullname);
2434
1587
}
2435
}
2436
2437
/* need to clean even if 0 because man page doesn't specify */
2438
free(direntries);
2439
if (numentries == -1){
2440
perror_plus("scandir");
1588
closedir(d);
2441
1589
}
2442
1590
ret = rmdir(tempdir);
2443
1591
if(ret == -1 and errno != ENOENT){
2444
perror_plus("rmdir");
1592
perror("rmdir");
2445
1593
}
2446
1594
}
2447
1595
2452
1600
&old_sigterm_action,
2453
1601
NULL));
2454
1602
if(ret == -1){
2455
perror_plus("sigaction");
1603
perror("sigaction");
2456
1604
}
2457
1605
do {
2458
1606
ret = raise(signal_received);
2459
1607
} while(ret != 0 and errno == EINTR);
2460
1608
if(ret != 0){
2461
perror_plus("raise");
1609
perror("raise");
2462
1610
abort();
2463
1611
}
2464
1612
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0