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- Committer: Teddy Hogeborn
- Date: 2009-09-08 06:28:20 UTC
- Revision ID: teddy@fukt.bsnet.se-20090908062820-xgkdkrnvuze9vc72
* debian/mandos-client.README.Debian: Improved wording and formatting.
Updated location of nfsroot.txt.
* debian/mandos.README.Debian: Improved wording and formatting.
Updated location of nfsroot.txt.
* debian/mandos.README.Debian: Improved wording and formatting.
- 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() */
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() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
85
92
86
#ifdef __linux__
93
87
#include <sys/klog.h> /* klogctl() */
111
105
init_gnutls_session(),
112
106
GNUTLS_* */
113
107
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
116
110
117
111
/* GPGME */
118
112
#include <gpgme.h> /* All GPGME types, constants and
126
120
#define PATHDIR "/conf/conf.d/mandos"
127
121
#define SECKEY "seckey.txt"
128
122
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
123
131
124
bool debug = false;
132
125
static const char mandos_protocol_version[] = "1";
133
126
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
uid_t uid = 65534;
139
gid_t gid = 65534;
140
141
/* Doubly linked list that need to be circularly linked when used */
142
typedef struct server{
143
const char *ip;
144
uint16_t port;
145
AvahiIfIndex if_index;
146
int af;
147
struct timespec last_seen;
148
struct server *next;
149
struct server *prev;
150
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
151
128
152
129
/* Used for passing in values through the Avahi callback functions */
153
130
typedef struct {
158
135
gnutls_dh_params_t dh_params;
159
136
const char *priority;
160
137
gpgme_ctx_t ctx;
161
server *current_server;
162
138
} mandos_context;
163
139
164
140
/* global context so signal handler can reach it*/
165
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
142
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
169
170
sig_atomic_t quit_now = 0;
171
int signal_received = 0;
172
173
/* Function to use when printing errors */
174
void perror_plus(const char *print_text){
175
int e = errno;
176
fprintf(stderr, "Mandos plugin %s: ",
177
program_invocation_short_name);
178
errno = e;
179
perror(print_text);
180
}
181
182
__attribute__((format (gnu_printf, 2, 3)))
183
int fprintf_plus(FILE *stream, const char *format, ...){
184
va_list ap;
185
va_start (ap, format);
186
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
188
program_invocation_short_name));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
191
144
192
145
/*
193
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
148
* "buffer_length" is how much is already used.
196
149
*/
197
150
size_t incbuffer(char **buffer, size_t buffer_length,
198
size_t buffer_capacity){
151
size_t buffer_capacity){
199
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
200
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
154
if(buffer == NULL){
206
159
return buffer_capacity;
207
160
}
208
161
209
/* Add server to set of servers to retry periodically */
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
212
int ret;
213
server *new_server = malloc(sizeof(server));
214
if(new_server == NULL){
215
perror_plus("malloc");
216
return false;
217
}
218
*new_server = (server){ .ip = strdup(ip),
219
.port = port,
220
.if_index = if_index,
221
.af = af };
222
if(new_server->ip == NULL){
223
perror_plus("strdup");
224
return false;
225
}
226
/* Special case of first server */
227
if (mc.current_server == NULL){
228
new_server->next = new_server;
229
new_server->prev = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
232
} else {
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
235
new_server->prev->next = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
return true;
244
}
245
246
162
/*
247
163
* Initialize GPGME.
248
164
*/
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
251
167
gpgme_error_t rc;
252
168
gpgme_engine_info_t engine_info;
253
169
262
178
263
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
180
if(fd == -1){
265
perror_plus("open");
181
perror("open");
266
182
return false;
267
183
}
268
184
269
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
186
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
273
189
return false;
274
190
}
275
191
276
192
rc = gpgme_op_import(mc.ctx, pgp_data);
277
193
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
280
196
return false;
281
197
}
282
198
283
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
284
200
if(ret == -1){
285
perror_plus("close");
201
perror("close");
286
202
}
287
203
gpgme_data_release(pgp_data);
288
204
return true;
289
205
}
290
206
291
207
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
293
209
}
294
210
295
211
/* Init GPGME */
296
212
gpgme_check_version(NULL);
297
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
214
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
301
217
return false;
302
218
}
303
219
304
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
305
221
rc = gpgme_get_engine_info(&engine_info);
306
222
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
309
225
return false;
310
226
}
311
227
while(engine_info != NULL){
317
233
engine_info = engine_info->next;
318
234
}
319
235
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
322
237
return false;
323
238
}
324
239
325
240
/* Create new GPGME "context" */
326
241
rc = gpgme_new(&(mc.ctx));
327
242
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
331
245
return false;
332
246
}
333
247
352
266
ssize_t plaintext_length = 0;
353
267
354
268
if(debug){
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
270
}
357
271
358
272
/* Create new GPGME data buffer from memory cryptotext */
359
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
360
274
0);
361
275
if(rc != GPG_ERR_NO_ERROR){
362
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
364
278
return -1;
365
279
}
366
280
367
281
/* Create new empty GPGME data buffer for the plaintext */
368
282
rc = gpgme_data_new(&dh_plain);
369
283
if(rc != GPG_ERR_NO_ERROR){
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
373
286
gpgme_data_release(dh_crypto);
374
287
return -1;
375
288
}
378
291
data buffer */
379
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
293
if(rc != GPG_ERR_NO_ERROR){
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
383
296
plaintext_length = -1;
384
297
if(debug){
385
298
gpgme_decrypt_result_t result;
386
299
result = gpgme_op_decrypt_result(mc.ctx);
387
300
if(result == NULL){
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
302
} else {
390
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
391
result->unsupported_algorithm);
392
fprintf_plus(stderr, "Wrong key usage: %u\n",
393
result->wrong_key_usage);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
394
307
if(result->file_name != NULL){
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
396
309
}
397
310
gpgme_recipient_t recipient;
398
311
recipient = result->recipients;
399
312
while(recipient != NULL){
400
fprintf_plus(stderr, "Public key algorithm: %s\n",
401
gpgme_pubkey_algo_name
402
(recipient->pubkey_algo));
403
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
404
fprintf_plus(stderr, "Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
407
319
recipient = recipient->next;
408
320
}
409
321
}
412
324
}
413
325
414
326
if(debug){
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
328
}
417
329
418
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
421
333
plaintext_length = -1;
422
334
goto decrypt_end;
423
335
}
425
337
*plaintext = NULL;
426
338
while(true){
427
339
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
430
342
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
434
346
}
435
347
436
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
441
353
break;
442
354
}
443
355
if(ret < 0){
444
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
445
357
plaintext_length = -1;
446
358
goto decrypt_end;
447
359
}
449
361
}
450
362
451
363
if(debug){
452
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
453
365
for(ssize_t i = 0; i < plaintext_length; i++){
454
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
455
367
}
477
389
/* GnuTLS log function callback */
478
390
static void debuggnutls(__attribute__((unused)) int level,
479
391
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
481
393
}
482
394
483
395
static int init_gnutls_global(const char *pubkeyfilename,
485
397
int ret;
486
398
487
399
if(debug){
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
489
401
}
490
402
491
403
ret = gnutls_global_init();
492
404
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
495
407
return -1;
496
408
}
497
409
504
416
}
505
417
506
418
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
508
420
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
511
426
gnutls_global_deinit();
512
427
return -1;
513
428
}
514
429
515
430
if(debug){
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
520
434
}
521
435
522
436
ret = gnutls_certificate_set_openpgp_key_file
523
437
(mc.cred, pubkeyfilename, seckeyfilename,
524
438
GNUTLS_OPENPGP_FMT_BASE64);
525
439
if(ret != GNUTLS_E_SUCCESS){
526
fprintf_plus(stderr,
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
528
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
529
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
530
safer_gnutls_strerror(ret));
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
531
445
goto globalfail;
532
446
}
533
447
534
448
/* GnuTLS server initialization */
535
449
ret = gnutls_dh_params_init(&mc.dh_params);
536
450
if(ret != GNUTLS_E_SUCCESS){
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
540
453
goto globalfail;
541
454
}
542
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
456
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
546
459
goto globalfail;
547
460
}
548
461
561
474
static int init_gnutls_session(gnutls_session_t *session){
562
475
int ret;
563
476
/* GnuTLS session creation */
564
do {
565
ret = gnutls_init(session, GNUTLS_SERVER);
566
if(quit_now){
567
return -1;
568
}
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_init(session, GNUTLS_SERVER);
570
478
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
574
481
}
575
482
576
483
{
577
484
const char *err;
578
do {
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
if(quit_now){
581
gnutls_deinit(*session);
582
return -1;
583
}
584
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
486
if(ret != GNUTLS_E_SUCCESS){
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
589
490
gnutls_deinit(*session);
590
491
return -1;
591
492
}
592
493
}
593
494
594
do {
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc.cred);
597
if(quit_now){
598
gnutls_deinit(*session);
599
return -1;
600
}
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
602
497
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
605
500
gnutls_deinit(*session);
606
501
return -1;
607
502
}
608
503
609
504
/* ignore client certificate if any. */
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
611
507
612
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
509
618
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
619
515
__attribute__((unused)) const char *txt){}
620
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
621
520
/* Called when a Mandos server is found */
622
521
static int start_mandos_communication(const char *ip, uint16_t port,
623
522
AvahiIfIndex if_index,
629
528
struct sockaddr_in6 in6;
630
529
} to;
631
530
char *buffer = NULL;
632
char *decrypted_buffer = NULL;
531
char *decrypted_buffer;
633
532
size_t buffer_length = 0;
634
533
size_t buffer_capacity = 0;
635
534
size_t written;
636
int retval = -1;
535
int retval = 0;
637
536
gnutls_session_t session;
638
537
int pf; /* Protocol family */
639
538
640
errno = 0;
641
642
539
if(quit_now){
643
errno = EINTR;
644
540
return -1;
645
541
}
646
542
652
548
pf = PF_INET;
653
549
break;
654
550
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
656
errno = EINVAL;
551
fprintf(stderr, "Bad address family: %d\n", af);
657
552
return -1;
658
553
}
659
554
663
558
}
664
559
665
560
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
562
"\n", ip, port);
668
563
}
669
564
670
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
566
if(tcp_sd < 0){
672
int e = errno;
673
perror_plus("socket");
674
errno = e;
567
perror("socket");
568
retval = -1;
675
569
goto mandos_end;
676
570
}
677
571
678
572
if(quit_now){
679
errno = EINTR;
680
573
goto mandos_end;
681
574
}
682
575
689
582
ret = inet_pton(af, ip, &to.in.sin_addr);
690
583
}
691
584
if(ret < 0 ){
692
int e = errno;
693
perror_plus("inet_pton");
694
errno = e;
585
perror("inet_pton");
586
retval = -1;
695
587
goto mandos_end;
696
588
}
697
589
if(ret == 0){
698
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
700
errno = e;
590
fprintf(stderr, "Bad address: %s\n", ip);
591
retval = -1;
701
592
goto mandos_end;
702
593
}
703
594
if(af == AF_INET6){
707
598
708
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
601
-Wunreachable-code*/
711
602
if(if_index == AVAHI_IF_UNSPEC){
712
fprintf_plus(stderr, "An IPv6 link-local address is"
713
" incomplete without a network interface\n");
714
errno = EINVAL;
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
605
retval = -1;
715
606
goto mandos_end;
716
607
}
717
608
/* Set the network interface number as scope */
724
615
}
725
616
726
617
if(quit_now){
727
errno = EINTR;
728
618
goto mandos_end;
729
619
}
730
620
732
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
733
623
char interface[IF_NAMESIZE];
734
624
if(if_indextoname((unsigned int)if_index, interface) == NULL){
735
perror_plus("if_indextoname");
625
perror("if_indextoname");
736
626
} else {
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
739
629
}
740
630
} else {
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
743
633
}
744
634
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
745
635
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
752
642
sizeof(addrstr));
753
643
}
754
644
if(pcret == NULL){
755
perror_plus("inet_ntop");
645
perror("inet_ntop");
756
646
} else {
757
647
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
648
fprintf(stderr, "Canonical address form: %s\n", addrstr);
759
649
}
760
650
}
761
651
}
762
652
763
653
if(quit_now){
764
errno = EINTR;
765
654
goto mandos_end;
766
655
}
767
656
771
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
772
661
}
773
662
if(ret < 0){
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
int e = errno;
776
perror_plus("connect");
777
errno = e;
778
}
663
perror("connect");
664
retval = -1;
779
665
goto mandos_end;
780
666
}
781
667
782
668
if(quit_now){
783
errno = EINTR;
784
669
goto mandos_end;
785
670
}
786
671
789
674
while(true){
790
675
size_t out_size = strlen(out);
791
676
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
792
out_size - written));
677
out_size - written));
793
678
if(ret == -1){
794
int e = errno;
795
perror_plus("write");
796
errno = e;
679
perror("write");
680
retval = -1;
797
681
goto mandos_end;
798
682
}
799
683
written += (size_t)ret;
809
693
}
810
694
811
695
if(quit_now){
812
errno = EINTR;
813
696
goto mandos_end;
814
697
}
815
698
}
816
699
817
700
if(debug){
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
819
702
}
820
703
821
704
if(quit_now){
822
errno = EINTR;
823
705
goto mandos_end;
824
706
}
825
707
826
/* This casting via intptr_t is to eliminate warning about casting
827
an int to a pointer type. This is exactly how the GnuTLS Guile
828
function "set-session-transport-fd!" does it. */
829
gnutls_transport_set_ptr(session,
830
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
831
709
832
710
if(quit_now){
833
errno = EINTR;
834
711
goto mandos_end;
835
712
}
836
713
837
714
do {
838
715
ret = gnutls_handshake(session);
839
716
if(quit_now){
840
errno = EINTR;
841
717
goto mandos_end;
842
718
}
843
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
844
720
845
721
if(ret != GNUTLS_E_SUCCESS){
846
722
if(debug){
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
723
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
848
724
gnutls_perror(ret);
849
725
}
850
errno = EPROTO;
726
retval = -1;
851
727
goto mandos_end;
852
728
}
853
729
854
730
/* Read OpenPGP packet that contains the wanted password */
855
731
856
732
if(debug){
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
734
ip);
859
735
}
860
736
861
737
while(true){
862
738
863
739
if(quit_now){
864
errno = EINTR;
865
740
goto mandos_end;
866
741
}
867
742
868
743
buffer_capacity = incbuffer(&buffer, buffer_length,
869
buffer_capacity);
744
buffer_capacity);
870
745
if(buffer_capacity == 0){
871
int e = errno;
872
perror_plus("incbuffer");
873
errno = e;
746
perror("incbuffer");
747
retval = -1;
874
748
goto mandos_end;
875
749
}
876
750
877
751
if(quit_now){
878
errno = EINTR;
879
752
goto mandos_end;
880
753
}
881
754
894
767
ret = gnutls_handshake(session);
895
768
896
769
if(quit_now){
897
errno = EINTR;
898
770
goto mandos_end;
899
771
}
900
772
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
901
773
if(ret < 0){
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
904
775
gnutls_perror(ret);
905
errno = EPROTO;
776
retval = -1;
906
777
goto mandos_end;
907
778
}
908
779
break;
909
780
default:
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
781
fprintf(stderr, "Unknown error while reading data from"
782
" encrypted session with Mandos server\n");
783
retval = -1;
912
784
gnutls_bye(session, GNUTLS_SHUT_RDWR);
913
errno = EIO;
914
785
goto mandos_end;
915
786
}
916
787
} else {
919
790
}
920
791
921
792
if(debug){
922
fprintf_plus(stderr, "Closing TLS session\n");
923
}
924
925
if(quit_now){
926
errno = EINTR;
927
goto mandos_end;
928
}
929
930
do {
931
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
932
if(quit_now){
933
errno = EINTR;
934
goto mandos_end;
935
}
936
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
793
fprintf(stderr, "Closing TLS session\n");
794
}
795
796
if(quit_now){
797
goto mandos_end;
798
}
799
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
802
if(quit_now){
803
goto mandos_end;
804
}
937
805
938
806
if(buffer_length > 0){
939
807
ssize_t decrypted_buffer_size;
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
809
buffer_length,
941
810
&decrypted_buffer);
942
811
if(decrypted_buffer_size >= 0){
943
812
944
813
written = 0;
945
814
while(written < (size_t) decrypted_buffer_size){
946
815
if(quit_now){
947
errno = EINTR;
948
816
goto mandos_end;
949
817
}
950
818
952
820
(size_t)decrypted_buffer_size - written,
953
821
stdout);
954
822
if(ret == 0 and ferror(stdout)){
955
int e = errno;
956
823
if(debug){
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
824
fprintf(stderr, "Error writing encrypted data: %s\n",
825
strerror(errno));
959
826
}
960
errno = e;
961
goto mandos_end;
827
retval = -1;
828
break;
962
829
}
963
830
written += (size_t)ret;
964
831
}
965
retval = 0;
832
free(decrypted_buffer);
833
} else {
834
retval = -1;
966
835
}
836
} else {
837
retval = -1;
967
838
}
968
839
969
840
/* Shutdown procedure */
970
841
971
842
mandos_end:
972
{
973
int e = errno;
974
free(decrypted_buffer);
975
free(buffer);
976
if(tcp_sd >= 0){
977
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
978
}
979
if(ret == -1){
980
if(e == 0){
981
e = errno;
982
}
983
perror_plus("close");
984
}
985
gnutls_deinit(session);
986
errno = e;
987
if(quit_now){
988
errno = EINTR;
989
retval = -1;
990
}
843
free(buffer);
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
847
if(ret == -1){
848
perror("close");
849
}
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
991
853
}
992
854
return retval;
993
855
}
1018
880
switch(event){
1019
881
default:
1020
882
case AVAHI_RESOLVER_FAILURE:
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1023
domain,
1024
avahi_strerror(avahi_server_errno(mc.server)));
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
884
" of type '%s' in domain '%s': %s\n", name, type, domain,
885
avahi_strerror(avahi_server_errno(mc.server)));
1025
886
break;
1026
887
1027
888
case AVAHI_RESOLVER_FOUND:
1029
890
char ip[AVAHI_ADDRESS_STR_MAX];
1030
891
avahi_address_snprint(ip, sizeof(ip), address);
1031
892
if(debug){
1032
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
host_name, ip, (intmax_t)interface, port);
893
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
ip, (intmax_t)interface, port);
1035
896
}
1036
897
int ret = start_mandos_communication(ip, port, interface,
1037
898
avahi_proto_to_af(proto));
1038
899
if(ret == 0){
1039
900
avahi_simple_poll_quit(mc.simple_poll);
1040
} else {
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
1046
901
}
1047
902
}
1048
903
}
1072
927
default:
1073
928
case AVAHI_BROWSER_FAILURE:
1074
929
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
930
fprintf(stderr, "(Avahi browser) %s\n",
931
avahi_strerror(avahi_server_errno(mc.server)));
1077
932
avahi_simple_poll_quit(mc.simple_poll);
1078
933
return;
1079
934
1086
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
942
name, type, domain, protocol, 0,
1088
943
resolve_callback, NULL) == NULL)
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1090
" %s\n", name,
1091
avahi_strerror(avahi_server_errno(mc.server)));
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
945
name, avahi_strerror(avahi_server_errno(mc.server)));
1092
946
break;
1093
947
1094
948
case AVAHI_BROWSER_REMOVE:
1097
951
case AVAHI_BROWSER_ALL_FOR_NOW:
1098
952
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1099
953
if(debug){
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
954
fprintf(stderr, "No Mandos server found, still searching...\n");
1102
955
}
1103
956
break;
1104
957
}
1105
958
}
1106
959
1107
/* Signal handler that stops main loop after SIGTERM */
960
/* stop main loop after sigterm has been called */
1108
961
static void handle_sigterm(int sig){
1109
962
if(quit_now){
1110
963
return;
1112
965
quit_now = 1;
1113
966
signal_received = sig;
1114
967
int old_errno = errno;
1115
/* set main loop to exit */
1116
968
if(mc.simple_poll != NULL){
1117
969
avahi_simple_poll_quit(mc.simple_poll);
1118
970
}
1119
971
errno = old_errno;
1120
972
}
1121
973
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1123
int ret;
1124
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1126
if(s < 0){
1127
perror_plus("socket");
1128
return false;
1129
}
1130
strcpy(ifr->ifr_name, ifname);
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1132
if(ret == -1){
1133
if(debug){
1134
perror_plus("ioctl SIOCGIFFLAGS");
1135
}
1136
return false;
1137
}
1138
return true;
1139
}
1140
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1142
1143
/* Reject the loopback device */
1144
if(ifr->ifr_flags & IFF_LOOPBACK){
1145
if(debug){
1146
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1147
ifname);
1148
}
1149
return false;
1150
}
1151
/* Accept point-to-point devices only if connect_to is specified */
1152
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1153
if(debug){
1154
fprintf_plus(stderr, "Accepting point-to-point interface"
1155
" \"%s\"\n", ifname);
1156
}
1157
return true;
1158
}
1159
/* Otherwise, reject non-broadcast-capable devices */
1160
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1161
if(debug){
1162
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1163
" \"%s\"\n", ifname);
1164
}
1165
return false;
1166
}
1167
/* Reject non-ARP interfaces (including dummy interfaces) */
1168
if(ifr->ifr_flags & IFF_NOARP){
1169
if(debug){
1170
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1171
ifname);
1172
}
1173
return false;
1174
}
1175
1176
/* Accept this device */
1177
if(debug){
1178
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1179
}
1180
return true;
1181
}
1182
1183
/*
1184
* This function determines if a directory entry in /sys/class/net
1185
* corresponds to an acceptable network device.
1186
* (This function is passed to scandir(3) as a filter function.)
1187
*/
1188
int good_interface(const struct dirent *if_entry){
1189
if(if_entry->d_name[0] == '.'){
1190
return 0;
1191
}
1192
1193
struct ifreq ifr;
1194
if(not get_flags(if_entry->d_name, &ifr)){
1195
if(debug){
1196
fprintf_plus(stderr, "Failed to get flags for interface "
1197
"\"%s\"\n", if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
if(not good_flags(if_entry->d_name, &ifr)){
1203
return 0;
1204
}
1205
return 1;
1206
}
1207
1208
/*
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
int notdotentries(const struct dirent *direntry){
1252
/* Skip "." and ".." */
1253
if(direntry->d_name[0] == '.'
1254
and (direntry->d_name[1] == '\0'
1255
or (direntry->d_name[1] == '.'
1256
and direntry->d_name[2] == '\0'))){
1257
return 0;
1258
}
1259
return 1;
1260
}
1261
1262
/* Is this directory entry a runnable program? */
1263
int runnable_hook(const struct dirent *direntry){
1264
int ret;
1265
size_t sret;
1266
struct stat st;
1267
1268
if((direntry->d_name)[0] == '\0'){
1269
/* Empty name? */
1270
return 0;
1271
}
1272
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1274
"abcdefghijklmnopqrstuvwxyz"
1275
"0123456789"
1276
"_-");
1277
if((direntry->d_name)[sret] != '\0'){
1278
/* Contains non-allowed characters */
1279
if(debug){
1280
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1281
direntry->d_name);
1282
}
1283
return 0;
1284
}
1285
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1294
if(ret == -1){
1295
if(debug){
1296
perror_plus("Could not stat hook");
1297
}
1298
return 0;
1299
}
1300
if(not (S_ISREG(st.st_mode))){
1301
/* Not a regular file */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1309
/* Not executable */
1310
if(debug){
1311
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1312
direntry->d_name);
1313
}
1314
return 0;
1315
}
1316
if(debug){
1317
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1318
direntry->d_name);
1319
}
1320
return 1;
1321
}
1322
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1324
int ret;
1325
struct timespec now;
1326
struct timespec waited_time;
1327
intmax_t block_time;
1328
1329
while(true){
1330
if(mc.current_server == NULL){
1331
if (debug){
1332
fprintf_plus(stderr, "Wait until first server is found."
1333
" No timeout!\n");
1334
}
1335
ret = avahi_simple_poll_iterate(s, -1);
1336
} else {
1337
if (debug){
1338
fprintf_plus(stderr, "Check current_server if we should run"
1339
" it, or wait\n");
1340
}
1341
/* the current time */
1342
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1343
if(ret == -1){
1344
perror_plus("clock_gettime");
1345
return -1;
1346
}
1347
/* Calculating in ms how long time between now and server
1348
who we visted longest time ago. Now - last seen. */
1349
waited_time.tv_sec = (now.tv_sec
1350
- mc.current_server->last_seen.tv_sec);
1351
waited_time.tv_nsec = (now.tv_nsec
1352
- mc.current_server->last_seen.tv_nsec);
1353
/* total time is 10s/10,000ms.
1354
Converting to s from ms by dividing by 1,000,
1355
and ns to ms by dividing by 1,000,000. */
1356
block_time = ((retry_interval
1357
- ((intmax_t)waited_time.tv_sec * 1000))
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1359
1360
if (debug){
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1362
block_time);
1363
}
1364
1365
if(block_time <= 0){
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1370
if(ret == 0){
1371
avahi_simple_poll_quit(mc.simple_poll);
1372
return 0;
1373
}
1374
ret = clock_gettime(CLOCK_MONOTONIC,
1375
&mc.current_server->last_seen);
1376
if(ret == -1){
1377
perror_plus("clock_gettime");
1378
return -1;
1379
}
1380
mc.current_server = mc.current_server->next;
1381
block_time = 0; /* Call avahi to find new Mandos
1382
servers, but don't block */
1383
}
1384
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
}
1387
if(ret != 0){
1388
if (ret > 0 or errno != EINTR){
1389
return (ret != 1) ? ret : 0;
1390
}
1391
}
1392
}
1393
}
1394
1395
/* Set effective uid to 0, return errno */
1396
int raise_privileges(void){
1397
int old_errno = errno;
1398
int ret_errno = 0;
1399
errno = 0;
1400
if(seteuid(0) == -1){
1401
perror_plus("seteuid");
1402
}
1403
ret_errno = errno;
1404
errno = old_errno;
1405
return ret_errno;
1406
}
1407
1408
/* Set effective and real user ID to 0. Return errno. */
1409
int raise_privileges_permanently(void){
1410
int old_errno = errno;
1411
int ret_errno = raise_privileges();
1412
if(ret_errno != 0){
1413
errno = old_errno;
1414
return ret_errno;
1415
}
1416
errno = 0;
1417
if(setuid(0) == -1){
1418
perror_plus("seteuid");
1419
}
1420
ret_errno = errno;
1421
errno = old_errno;
1422
return ret_errno;
1423
}
1424
1425
/* Set effective user ID to unprivileged saved user ID */
1426
int lower_privileges(void){
1427
int old_errno = errno;
1428
int ret_errno = 0;
1429
errno = 0;
1430
if(seteuid(uid) == -1){
1431
perror_plus("seteuid");
1432
}
1433
ret_errno = errno;
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
bool run_network_hooks(const char *mode, const char *interface,
1439
const float delay){
1440
struct dirent **direntries;
1441
struct dirent *direntry;
1442
int ret;
1443
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1444
alphasort);
1445
if(numhooks == -1){
1446
perror_plus("scandir");
1447
} else {
1448
int devnull = open("/dev/null", O_RDONLY);
1449
for(int i = 0; i < numhooks; i++){
1450
direntry = direntries[i];
1451
char *fullname = NULL;
1452
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1453
if(ret < 0){
1454
perror_plus("asprintf");
1455
continue;
1456
}
1457
if(debug){
1458
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1459
direntry->d_name);
1460
}
1461
pid_t hook_pid = fork();
1462
if(hook_pid == 0){
1463
/* Child */
1464
/* Raise privileges */
1465
raise_privileges_permanently();
1466
/* Set group */
1467
errno = 0;
1468
ret = setgid(0);
1469
if(ret == -1){
1470
perror_plus("setgid");
1471
}
1472
/* Reset supplementary groups */
1473
errno = 0;
1474
ret = setgroups(0, NULL);
1475
if(ret == -1){
1476
perror_plus("setgroups");
1477
}
1478
dup2(devnull, STDIN_FILENO);
1479
close(devnull);
1480
dup2(STDERR_FILENO, STDOUT_FILENO);
1481
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1482
if(ret == -1){
1483
perror_plus("setenv");
1484
_exit(EX_OSERR);
1485
}
1486
ret = setenv("DEVICE", interface, 1);
1487
if(ret == -1){
1488
perror_plus("setenv");
1489
_exit(EX_OSERR);
1490
}
1491
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1492
if(ret == -1){
1493
perror_plus("setenv");
1494
_exit(EX_OSERR);
1495
}
1496
ret = setenv("MODE", mode, 1);
1497
if(ret == -1){
1498
perror_plus("setenv");
1499
_exit(EX_OSERR);
1500
}
1501
char *delaystring;
1502
ret = asprintf(&delaystring, "%f", delay);
1503
if(ret == -1){
1504
perror_plus("asprintf");
1505
_exit(EX_OSERR);
1506
}
1507
ret = setenv("DELAY", delaystring, 1);
1508
if(ret == -1){
1509
free(delaystring);
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
free(delaystring);
1514
if(connect_to != NULL){
1515
ret = setenv("CONNECT", connect_to, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
}
1521
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1522
perror_plus("execl");
1523
_exit(EXIT_FAILURE);
1524
}
1525
} else {
1526
int status;
1527
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1528
perror_plus("waitpid");
1529
free(fullname);
1530
continue;
1531
}
1532
if(WIFEXITED(status)){
1533
if(WEXITSTATUS(status) != 0){
1534
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1535
" with status %d\n", direntry->d_name,
1536
WEXITSTATUS(status));
1537
free(fullname);
1538
continue;
1539
}
1540
} else if(WIFSIGNALED(status)){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1542
" signal %d\n", direntry->d_name,
1543
WTERMSIG(status));
1544
free(fullname);
1545
continue;
1546
} else {
1547
fprintf_plus(stderr, "Warning: network hook \"%s\""
1548
" crashed\n", direntry->d_name);
1549
free(fullname);
1550
continue;
1551
}
1552
}
1553
free(fullname);
1554
if(debug){
1555
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1556
direntry->d_name);
1557
}
1558
}
1559
close(devnull);
1560
}
1561
return true;
1562
}
1563
1564
int bring_up_interface(const char * const interface, const float delay){
1565
int sd = -1;
1566
int old_errno = errno;
1567
int ret_errno = 0;
1568
int ret;
1569
struct ifreq network;
1570
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1571
if(if_index == 0){
1572
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1573
errno = old_errno;
1574
return ENXIO;
1575
}
1576
1577
if(quit_now){
1578
errno = old_errno;
1579
return EINTR;
1580
}
1581
1582
/* Re-raise priviliges */
1583
raise_privileges();
1584
1585
#ifdef __linux__
1586
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1587
messages about the network interface to mess up the prompt */
1588
ret = klogctl(8, NULL, 5);
1589
bool restore_loglevel = true;
1590
if(ret == -1){
1591
restore_loglevel = false;
1592
perror_plus("klogctl");
1593
}
1594
#endif /* __linux__ */
1595
1596
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1597
if(sd < 0){
1598
ret_errno = errno;
1599
perror_plus("socket");
1600
#ifdef __linux__
1601
if(restore_loglevel){
1602
ret = klogctl(7, NULL, 0);
1603
if(ret == -1){
1604
perror_plus("klogctl");
1605
}
1606
}
1607
#endif /* __linux__ */
1608
/* Lower privileges */
1609
lower_privileges();
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
if(ret == -1){
1616
ret_errno = errno;
1617
perror_plus("ioctl SIOCGIFFLAGS");
1618
#ifdef __linux__
1619
if(restore_loglevel){
1620
ret = klogctl(7, NULL, 0);
1621
if(ret == -1){
1622
perror_plus("klogctl");
1623
}
1624
}
1625
#endif /* __linux__ */
1626
/* Lower privileges */
1627
lower_privileges();
1628
errno = old_errno;
1629
return ret_errno;
1630
}
1631
if((network.ifr_flags & IFF_UP) == 0){
1632
network.ifr_flags |= IFF_UP;
1633
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1634
if(ret == -1){
1635
ret_errno = errno;
1636
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1637
#ifdef __linux__
1638
if(restore_loglevel){
1639
ret = klogctl(7, NULL, 0);
1640
if(ret == -1){
1641
perror_plus("klogctl");
1642
}
1643
}
1644
#endif /* __linux__ */
1645
/* Lower privileges */
1646
lower_privileges();
1647
errno = old_errno;
1648
return ret_errno;
1649
}
1650
}
1651
/* Sleep checking until interface is running.
1652
Check every 0.25s, up to total time of delay */
1653
for(int i=0; i < delay * 4; i++){
1654
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1655
if(ret == -1){
1656
perror_plus("ioctl SIOCGIFFLAGS");
1657
} else if(network.ifr_flags & IFF_RUNNING){
1658
break;
1659
}
1660
struct timespec sleeptime = { .tv_nsec = 250000000 };
1661
ret = nanosleep(&sleeptime, NULL);
1662
if(ret == -1 and errno != EINTR){
1663
perror_plus("nanosleep");
1664
}
1665
}
1666
/* Close the socket */
1667
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1668
if(ret == -1){
1669
perror_plus("close");
1670
}
1671
#ifdef __linux__
1672
if(restore_loglevel){
1673
/* Restores kernel loglevel to default */
1674
ret = klogctl(7, NULL, 0);
1675
if(ret == -1){
1676
perror_plus("klogctl");
1677
}
1678
}
1679
#endif /* __linux__ */
1680
/* Lower privileges */
1681
lower_privileges();
1682
errno = old_errno;
1683
return 0;
1684
}
1685
1686
974
int main(int argc, char *argv[]){
1687
975
AvahiSServiceBrowser *sb = NULL;
1688
976
int error;
1690
978
intmax_t tmpmax;
1691
979
char *tmp;
1692
980
int exitcode = EXIT_SUCCESS;
1693
const char *interface = "";
981
const char *interface = "eth0";
1694
982
struct ifreq network;
1695
983
int sd = -1;
1696
984
bool take_down_interface = false;
985
uid_t uid;
986
gid_t gid;
987
char *connect_to = NULL;
1697
988
char tempdir[] = "/tmp/mandosXXXXXX";
1698
989
bool tempdir_created = false;
1699
990
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1703
994
bool gnutls_initialized = false;
1704
995
bool gpgme_initialized = false;
1705
996
float delay = 2.5f;
1706
double retry_interval = 10; /* 10s between trying a server and
1707
retrying the same server again */
1708
997
1709
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
998
struct sigaction old_sigterm_action;
1710
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1711
1000
1712
uid = getuid();
1713
gid = getgid();
1714
1715
/* Lower any group privileges we might have, just to be safe */
1716
errno = 0;
1717
ret = setgid(gid);
1718
if(ret == -1){
1719
perror_plus("setgid");
1720
}
1721
1722
/* Lower user privileges (temporarily) */
1723
errno = 0;
1724
ret = seteuid(uid);
1725
if(ret == -1){
1726
perror_plus("seteuid");
1727
}
1728
1729
if(quit_now){
1730
goto end;
1731
}
1732
1733
1001
{
1734
1002
struct argp_option options[] = {
1735
1003
{ .name = "debug", .key = 128,
1764
1032
.arg = "SECONDS",
1765
1033
.doc = "Maximum delay to wait for interface startup",
1766
1034
.group = 2 },
1767
{ .name = "retry", .key = 132,
1768
.arg = "SECONDS",
1769
.doc = "Retry interval used when denied by the Mandos server",
1770
.group = 2 },
1771
{ .name = "network-hook-dir", .key = 133,
1772
.arg = "DIR",
1773
.doc = "Directory where network hooks are located",
1774
.group = 2 },
1775
/*
1776
* These reproduce what we would get without ARGP_NO_HELP
1777
*/
1778
{ .name = "help", .key = '?',
1779
.doc = "Give this help list", .group = -1 },
1780
{ .name = "usage", .key = -3,
1781
.doc = "Give a short usage message", .group = -1 },
1782
{ .name = "version", .key = 'V',
1783
.doc = "Print program version", .group = -1 },
1784
1035
{ .name = NULL }
1785
1036
};
1786
1037
1787
1038
error_t parse_opt(int key, char *arg,
1788
1039
struct argp_state *state){
1789
errno = 0;
1790
1040
switch(key){
1791
1041
case 128: /* --debug */
1792
1042
debug = true;
1808
1058
tmpmax = strtoimax(arg, &tmp, 10);
1809
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
1810
1060
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1811
argp_error(state, "Bad number of DH bits");
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
1812
1063
}
1813
1064
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1814
1065
break;
1819
1070
errno = 0;
1820
1071
delay = strtof(arg, &tmp);
1821
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
1822
argp_error(state, "Bad delay");
1823
}
1824
case 132: /* --retry */
1825
errno = 0;
1826
retry_interval = strtod(arg, &tmp);
1827
if(errno != 0 or tmp == arg or *tmp != '\0'
1828
or (retry_interval * 1000) > INT_MAX
1829
or retry_interval < 0){
1830
argp_error(state, "Bad retry interval");
1831
}
1832
break;
1833
case 133: /* --network-hook-dir */
1834
hookdir = arg;
1835
break;
1836
/*
1837
* These reproduce what we would get without ARGP_NO_HELP
1838
*/
1839
case '?': /* --help */
1840
argp_state_help(state, state->out_stream,
1841
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1842
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1843
case -3: /* --usage */
1844
argp_state_help(state, state->out_stream,
1845
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1846
case 'V': /* --version */
1847
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1848
exit(argp_err_exit_status);
1073
fprintf(stderr, "Bad delay\n");
1074
exit(EXIT_FAILURE);
1075
}
1076
break;
1077
case ARGP_KEY_ARG:
1078
argp_usage(state);
1079
case ARGP_KEY_END:
1849
1080
break;
1850
1081
default:
1851
1082
return ARGP_ERR_UNKNOWN;
1852
1083
}
1853
return errno;
1084
return 0;
1854
1085
}
1855
1086
1856
1087
struct argp argp = { .options = options, .parser = parse_opt,
1857
1088
.args_doc = "",
1858
1089
.doc = "Mandos client -- Get and decrypt"
1859
1090
" passwords from a Mandos server" };
1860
ret = argp_parse(&argp, argc, argv,
1861
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1862
switch(ret){
1863
case 0:
1864
break;
1865
case ENOMEM:
1866
default:
1867
errno = ret;
1868
perror_plus("argp_parse");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
case EINVAL:
1872
exitcode = EX_USAGE;
1873
goto end;
1874
}
1875
}
1876
1877
{
1878
/* Work around Debian bug #633582:
1879
<http://bugs.debian.org/633582> */
1880
1881
/* Re-raise priviliges */
1882
if(raise_privileges() == 0){
1883
struct stat st;
1884
1885
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1886
int seckey_fd = open(seckey, O_RDONLY);
1887
if(seckey_fd == -1){
1888
perror_plus("open");
1889
} else {
1890
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1891
if(ret == -1){
1892
perror_plus("fstat");
1893
} else {
1894
if(S_ISREG(st.st_mode)
1895
and st.st_uid == 0 and st.st_gid == 0){
1896
ret = fchown(seckey_fd, uid, gid);
1897
if(ret == -1){
1898
perror_plus("fchown");
1899
}
1900
}
1901
}
1902
TEMP_FAILURE_RETRY(close(seckey_fd));
1903
}
1904
}
1905
1906
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1907
int pubkey_fd = open(pubkey, O_RDONLY);
1908
if(pubkey_fd == -1){
1909
perror_plus("open");
1910
} else {
1911
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1912
if(ret == -1){
1913
perror_plus("fstat");
1914
} else {
1915
if(S_ISREG(st.st_mode)
1916
and st.st_uid == 0 and st.st_gid == 0){
1917
ret = fchown(pubkey_fd, uid, gid);
1918
if(ret == -1){
1919
perror_plus("fchown");
1920
}
1921
}
1922
}
1923
TEMP_FAILURE_RETRY(close(pubkey_fd));
1924
}
1925
}
1926
1927
/* Lower privileges */
1928
errno = 0;
1929
ret = seteuid(uid);
1930
if(ret == -1){
1931
perror_plus("seteuid");
1932
}
1933
}
1934
}
1935
1936
/* Run network hooks */
1937
if(not run_network_hooks("start", interface, delay)){
1938
goto end;
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
1095
goto end;
1096
}
1939
1097
}
1940
1098
1941
1099
if(not debug){
1942
1100
avahi_set_log_function(empty_log);
1943
1101
}
1944
1102
1945
if(interface[0] == '\0'){
1946
struct dirent **direntries;
1947
/* First look for interfaces that are up */
1948
ret = scandir(sys_class_net, &direntries, up_interface,
1949
alphasort);
1950
if(ret == 0){
1951
/* No up interfaces, look for any good interfaces */
1952
free(direntries);
1953
ret = scandir(sys_class_net, &direntries, good_interface,
1954
alphasort);
1955
}
1956
if(ret >= 1){
1957
/* Pick the first interface returned */
1958
interface = strdup(direntries[0]->d_name);
1959
if(debug){
1960
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1961
}
1962
if(interface == NULL){
1963
perror_plus("malloc");
1964
free(direntries);
1965
exitcode = EXIT_FAILURE;
1966
goto end;
1967
}
1968
free(direntries);
1969
} else {
1970
free(direntries);
1971
fprintf_plus(stderr, "Could not find a network interface\n");
1972
exitcode = EXIT_FAILURE;
1973
goto end;
1974
}
1975
}
1976
1977
1103
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1978
1104
from the signal handler */
1979
1105
/* Initialize the pseudo-RNG for Avahi */
1980
1106
srand((unsigned int) time(NULL));
1981
1107
mc.simple_poll = avahi_simple_poll_new();
1982
1108
if(mc.simple_poll == NULL){
1983
fprintf_plus(stderr,
1984
"Avahi: Failed to create simple poll object.\n");
1985
exitcode = EX_UNAVAILABLE;
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
1986
1111
goto end;
1987
1112
}
1988
1113
1989
1114
sigemptyset(&sigterm_action.sa_mask);
1990
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1991
1116
if(ret == -1){
1992
perror_plus("sigaddset");
1993
exitcode = EX_OSERR;
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
1994
1119
goto end;
1995
1120
}
1996
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1997
1122
if(ret == -1){
1998
perror_plus("sigaddset");
1999
exitcode = EX_OSERR;
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
2000
1125
goto end;
2001
1126
}
2002
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2003
1128
if(ret == -1){
2004
perror_plus("sigaddset");
2005
exitcode = EX_OSERR;
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
2006
1131
goto end;
2007
1132
}
2008
1133
/* Need to check if the handler is SIG_IGN before handling:
2011
1136
*/
2012
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2013
1138
if(ret == -1){
2014
perror_plus("sigaction");
2015
return EX_OSERR;
1139
perror("sigaction");
1140
return EXIT_FAILURE;
2016
1141
}
2017
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
2018
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
2019
1144
if(ret == -1){
2020
perror_plus("sigaction");
2021
exitcode = EX_OSERR;
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
2022
1147
goto end;
2023
1148
}
2024
1149
}
2025
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2026
1151
if(ret == -1){
2027
perror_plus("sigaction");
2028
return EX_OSERR;
1152
perror("sigaction");
1153
return EXIT_FAILURE;
2029
1154
}
2030
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
2031
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2032
1157
if(ret == -1){
2033
perror_plus("sigaction");
2034
exitcode = EX_OSERR;
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
2035
1160
goto end;
2036
1161
}
2037
1162
}
2038
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2039
1164
if(ret == -1){
2040
perror_plus("sigaction");
2041
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2042
1167
}
2043
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
2044
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2045
1170
if(ret == -1){
2046
perror_plus("sigaction");
2047
exitcode = EX_OSERR;
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
2048
1173
goto end;
2049
1174
}
2050
1175
}
2051
1176
2052
1177
/* If the interface is down, bring it up */
2053
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2054
ret = bring_up_interface(interface, delay);
2055
if(ret != 0){
2056
errno = ret;
2057
perror_plus("Failed to bring up interface");
1178
if(interface[0] != '\0'){
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
1180
if(if_index == 0){
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
1186
if(quit_now){
1187
goto end;
1188
}
1189
1190
#ifdef __linux__
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1193
ret = klogctl(8, NULL, 5);
1194
bool restore_loglevel = true;
1195
if(ret == -1){
1196
restore_loglevel = false;
1197
perror("klogctl");
1198
}
1199
#endif /* __linux__ */
1200
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
if(sd < 0){
1203
perror("socket");
1204
exitcode = EXIT_FAILURE;
1205
#ifdef __linux__
1206
if(restore_loglevel){
1207
ret = klogctl(7, NULL, 0);
1208
if(ret == -1){
1209
perror("klogctl");
1210
}
1211
}
1212
#endif /* __linux__ */
1213
goto end;
1214
}
1215
strcpy(network.ifr_name, interface);
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1217
if(ret == -1){
1218
perror("ioctl SIOCGIFFLAGS");
1219
#ifdef __linux__
1220
if(restore_loglevel){
1221
ret = klogctl(7, NULL, 0);
1222
if(ret == -1){
1223
perror("klogctl");
1224
}
1225
}
1226
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1228
goto end;
1229
}
1230
if((network.ifr_flags & IFF_UP) == 0){
1231
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
if(ret == -1){
1235
take_down_interface = false;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
goto end;
1247
}
1248
}
1249
/* sleep checking until interface is running */
1250
for(int i=0; i < delay * 4; i++){
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1252
if(ret == -1){
1253
perror("ioctl SIOCGIFFLAGS");
1254
} else if(network.ifr_flags & IFF_RUNNING){
1255
break;
1256
}
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
ret = nanosleep(&sleeptime, NULL);
1259
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1261
}
1262
}
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
if(ret == -1){
1267
perror("close");
1268
}
1269
}
1270
#ifdef __linux__
1271
if(restore_loglevel){
1272
/* Restores kernel loglevel to default */
1273
ret = klogctl(7, NULL, 0);
1274
if(ret == -1){
1275
perror("klogctl");
1276
}
1277
}
1278
#endif /* __linux__ */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1283
}
1284
1285
uid = getuid();
1286
gid = getgid();
1287
1288
/* Drop any group privileges we might have, just to be safe */
1289
errno = 0;
1290
ret = setgid(gid);
1291
if(ret == -1){
1292
perror("setgid");
1293
}
1294
1295
/* Drop user privileges */
1296
errno = 0;
1297
/* Will we need privileges later? */
1298
if(take_down_interface){
1299
/* Drop user privileges temporarily */
1300
ret = seteuid(uid);
1301
if(ret == -1){
1302
perror("seteuid");
1303
}
1304
} else {
1305
/* Drop user privileges permanently */
1306
ret = setuid(uid);
1307
if(ret == -1){
1308
perror("setuid");
2058
1309
}
2059
1310
}
2060
1311
2064
1315
2065
1316
ret = init_gnutls_global(pubkey, seckey);
2066
1317
if(ret == -1){
2067
fprintf_plus(stderr, "init_gnutls_global failed\n");
2068
exitcode = EX_UNAVAILABLE;
1318
fprintf(stderr, "init_gnutls_global failed\n");
1319
exitcode = EXIT_FAILURE;
2069
1320
goto end;
2070
1321
} else {
2071
1322
gnutls_initialized = true;
2075
1326
goto end;
2076
1327
}
2077
1328
1329
tempdir_created = true;
2078
1330
if(mkdtemp(tempdir) == NULL){
2079
perror_plus("mkdtemp");
1331
tempdir_created = false;
1332
perror("mkdtemp");
2080
1333
goto end;
2081
1334
}
2082
tempdir_created = true;
2083
1335
2084
1336
if(quit_now){
2085
1337
goto end;
2086
1338
}
2087
1339
2088
1340
if(not init_gpgme(pubkey, seckey, tempdir)){
2089
fprintf_plus(stderr, "init_gpgme failed\n");
2090
exitcode = EX_UNAVAILABLE;
1341
fprintf(stderr, "init_gpgme failed\n");
1342
exitcode = EXIT_FAILURE;
2091
1343
goto end;
2092
1344
} else {
2093
1345
gpgme_initialized = true;
2101
1353
/* Connect directly, do not use Zeroconf */
2102
1354
/* (Mainly meant for debugging) */
2103
1355
char *address = strrchr(connect_to, ':');
2104
2105
1356
if(address == NULL){
2106
fprintf_plus(stderr, "No colon in address\n");
2107
exitcode = EX_USAGE;
1357
fprintf(stderr, "No colon in address\n");
1358
exitcode = EXIT_FAILURE;
2108
1359
goto end;
2109
1360
}
2110
1361
2117
1368
tmpmax = strtoimax(address+1, &tmp, 10);
2118
1369
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2119
1370
or tmpmax != (uint16_t)tmpmax){
2120
fprintf_plus(stderr, "Bad port number\n");
2121
exitcode = EX_USAGE;
1371
fprintf(stderr, "Bad port number\n");
1372
exitcode = EXIT_FAILURE;
2122
1373
goto end;
2123
1374
}
2124
1375
2128
1379
2129
1380
port = (uint16_t)tmpmax;
2130
1381
*address = '\0';
1382
address = connect_to;
2131
1383
/* Colon in address indicates IPv6 */
2132
1384
int af;
2133
if(strchr(connect_to, ':') != NULL){
1385
if(strchr(address, ':') != NULL){
2134
1386
af = AF_INET6;
2135
/* Accept [] around IPv6 address - see RFC 5952 */
2136
if(connect_to[0] == '[' and address[-1] == ']')
2137
{
2138
connect_to++;
2139
address[-1] = '\0';
2140
}
2141
1387
} else {
2142
1388
af = AF_INET;
2143
1389
}
2144
address = connect_to;
2145
1390
2146
1391
if(quit_now){
2147
1392
goto end;
2148
1393
}
2149
1394
2150
while(not quit_now){
2151
ret = start_mandos_communication(address, port, if_index, af);
2152
if(quit_now or ret == 0){
2153
break;
2154
}
2155
if(debug){
2156
fprintf_plus(stderr, "Retrying in %d seconds\n",
2157
(int)retry_interval);
2158
}
2159
sleep((int)retry_interval);
2160
}
2161
2162
if (not quit_now){
1395
ret = start_mandos_communication(address, port, if_index, af);
1396
if(ret < 0){
1397
exitcode = EXIT_FAILURE;
1398
} else {
2163
1399
exitcode = EXIT_SUCCESS;
2164
1400
}
2165
2166
1401
goto end;
2167
1402
}
2168
1403
2190
1425
2191
1426
/* Check if creating the Avahi server object succeeded */
2192
1427
if(mc.server == NULL){
2193
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2194
avahi_strerror(error));
2195
exitcode = EX_UNAVAILABLE;
1428
fprintf(stderr, "Failed to create Avahi server: %s\n",
1429
avahi_strerror(error));
1430
exitcode = EXIT_FAILURE;
2196
1431
goto end;
2197
1432
}
2198
1433
2205
1440
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2206
1441
NULL, 0, browse_callback, NULL);
2207
1442
if(sb == NULL){
2208
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2209
avahi_strerror(avahi_server_errno(mc.server)));
2210
exitcode = EX_UNAVAILABLE;
1443
fprintf(stderr, "Failed to create service browser: %s\n",
1444
avahi_strerror(avahi_server_errno(mc.server)));
1445
exitcode = EXIT_FAILURE;
2211
1446
goto end;
2212
1447
}
2213
1448
2218
1453
/* Run the main loop */
2219
1454
2220
1455
if(debug){
2221
fprintf_plus(stderr, "Starting Avahi loop search\n");
2222
}
2223
2224
ret = avahi_loop_with_timeout(mc.simple_poll,
2225
(int)(retry_interval * 1000));
2226
if(debug){
2227
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2228
(ret == 0) ? "successfully" : "with error");
2229
}
1456
fprintf(stderr, "Starting Avahi loop search\n");
1457
}
1458
1459
avahi_simple_poll_loop(mc.simple_poll);
2230
1460
2231
1461
end:
2232
1462
2233
1463
if(debug){
2234
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1464
fprintf(stderr, "%s exiting\n", argv[0]);
2235
1465
}
2236
1466
2237
1467
/* Cleanup things */
2254
1484
gpgme_release(mc.ctx);
2255
1485
}
2256
1486
2257
/* Cleans up the circular linked list of Mandos servers the client
2258
has seen */
2259
if(mc.current_server != NULL){
2260
mc.current_server->prev->next = NULL;
2261
while(mc.current_server != NULL){
2262
server *next = mc.current_server->next;
2263
free(mc.current_server);
2264
mc.current_server = next;
1487
/* Take down the network interface */
1488
if(take_down_interface){
1489
/* Re-raise priviliges */
1490
errno = 0;
1491
ret = seteuid(0);
1492
if(ret == -1){
1493
perror("seteuid");
2265
1494
}
2266
}
2267
2268
/* Run network hooks */
2269
run_network_hooks("stop", interface, delay);
2270
2271
/* Re-raise priviliges */
2272
{
2273
raise_privileges();
2274
2275
/* Take down the network interface */
2276
if(take_down_interface and geteuid() == 0){
1495
if(geteuid() == 0){
2277
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2278
1497
if(ret == -1){
2279
perror_plus("ioctl SIOCGIFFLAGS");
2280
} else if(network.ifr_flags & IFF_UP){
2281
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_UP) {
1500
network.ifr_flags &= ~IFF_UP; /* clear flag */
2282
1501
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2283
1502
if(ret == -1){
2284
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1503
perror("ioctl SIOCSIFFLAGS");
2285
1504
}
2286
1505
}
2287
1506
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2288
1507
if(ret == -1){
2289
perror_plus("close");
1508
perror("close");
1509
}
1510
/* Lower privileges, permanently this time */
1511
errno = 0;
1512
ret = setuid(uid);
1513
if(ret == -1){
1514
perror("setuid");
2290
1515
}
2291
1516
}
2292
1517
}
2293
/* Lower privileges permanently */
2294
errno = 0;
2295
ret = setuid(uid);
2296
if(ret == -1){
2297
perror_plus("setuid");
2298
}
2299
1518
2300
/* Removes the GPGME temp directory and all files inside */
1519
/* Removes the temp directory used by GPGME */
2301
1520
if(tempdir_created){
2302
struct dirent **direntries = NULL;
2303
struct dirent *direntry = NULL;
2304
int numentries = scandir(tempdir, &direntries, notdotentries,
2305
alphasort);
2306
if (numentries > 0){
2307
for(int i = 0; i < numentries; i++){
2308
direntry = direntries[i];
1521
DIR *d;
1522
struct dirent *direntry;
1523
d = opendir(tempdir);
1524
if(d == NULL){
1525
if(errno != ENOENT){
1526
perror("opendir");
1527
}
1528
} else {
1529
while(true){
1530
direntry = readdir(d);
1531
if(direntry == NULL){
1532
break;
1533
}
1534
/* Skip "." and ".." */
1535
if(direntry->d_name[0] == '.'
1536
and (direntry->d_name[1] == '\0'
1537
or (direntry->d_name[1] == '.'
1538
and direntry->d_name[2] == '\0'))){
1539
continue;
1540
}
2309
1541
char *fullname = NULL;
2310
1542
ret = asprintf(&fullname, "%s/%s", tempdir,
2311
1543
direntry->d_name);
2312
1544
if(ret < 0){
2313
perror_plus("asprintf");
1545
perror("asprintf");
2314
1546
continue;
2315
1547
}
2316
1548
ret = remove(fullname);
2317
1549
if(ret == -1){
2318
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2319
strerror(errno));
1550
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1551
strerror(errno));
2320
1552
}
2321
1553
free(fullname);
2322
1554
}
2323
}
2324
2325
/* need to clean even if 0 because man page doesn't specify */
2326
free(direntries);
2327
if (numentries == -1){
2328
perror_plus("scandir");
1555
closedir(d);
2329
1556
}
2330
1557
ret = rmdir(tempdir);
2331
1558
if(ret == -1 and errno != ENOENT){
2332
perror_plus("rmdir");
1559
perror("rmdir");
2333
1560
}
2334
1561
}
2335
1562
2336
1563
if(quit_now){
2337
1564
sigemptyset(&old_sigterm_action.sa_mask);
2338
1565
old_sigterm_action.sa_handler = SIG_DFL;
2339
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2340
&old_sigterm_action,
2341
NULL));
1566
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2342
1567
if(ret == -1){
2343
perror_plus("sigaction");
2344
}
2345
do {
2346
ret = raise(signal_received);
2347
} while(ret != 0 and errno == EINTR);
2348
if(ret != 0){
2349
perror_plus("raise");
2350
abort();
2351
}
2352
TEMP_FAILURE_RETRY(pause());
1568
perror("sigaction");
1569
}
1570
raise(signal_received);
2353
1571
}
2354
1572
2355
1573
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0