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- Committer: Teddy Hogeborn
- Date: 2009-02-12 19:08:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20090212190835-dqv0piw2u254d0jc
* plugin-runner.c: Whitespace changes only.
- 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() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
39
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
48
44
#include <stdbool.h> /* bool, false, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
53
49
sockaddr_in6, PF_INET6,
54
50
SOCK_STREAM, uid_t, gid_t, open(),
55
51
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
52
#include <sys/stat.h> /* open() */
57
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
54
inet_pton(), connect() */
59
55
#include <fcntl.h> /* open() */
62
58
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
59
strtoimax() */
64
60
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
68
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
64
SIOCSIFFLAGS, if_indextoname(),
70
65
if_nametoindex(), IF_NAMESIZE */
72
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
68
*/
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
78
73
#include <iso646.h> /* not, or, and */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
78
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
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() */
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
91
81
92
82
#ifdef __linux__
93
83
#include <sys/klog.h> /* klogctl() */
111
101
init_gnutls_session(),
112
102
GNUTLS_* */
113
103
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
104
/* gnutls_certificate_set_openpgp_key_file(),
105
GNUTLS_OPENPGP_FMT_BASE64 */
116
106
117
107
/* GPGME */
118
108
#include <gpgme.h> /* All GPGME types, constants and
126
116
#define PATHDIR "/conf/conf.d/mandos"
127
117
#define SECKEY "seckey.txt"
128
118
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
119
131
120
bool debug = false;
132
121
static const char mandos_protocol_version[] = "1";
133
122
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;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
151
124
152
125
/* Used for passing in values through the Avahi callback functions */
153
126
typedef struct {
158
131
gnutls_dh_params_t dh_params;
159
132
const char *priority;
160
133
gpgme_ctx_t ctx;
161
server *current_server;
162
134
} mandos_context;
163
135
164
136
/* global context so signal handler can reach it*/
165
137
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
138
.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
}
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
191
140
192
141
/*
193
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
144
* "buffer_length" is how much is already used.
196
145
*/
197
146
size_t incbuffer(char **buffer, size_t buffer_length,
198
size_t buffer_capacity){
147
size_t buffer_capacity){
199
148
if(buffer_length + BUFFER_SIZE > buffer_capacity){
200
149
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
150
if(buffer == NULL){
206
155
return buffer_capacity;
207
156
}
208
157
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
158
/*
247
159
* Initialize GPGME.
248
160
*/
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
161
static bool init_gpgme(const char *seckey,
162
const char *pubkey, const char *tempdir){
163
int ret;
251
164
gpgme_error_t rc;
252
165
gpgme_engine_info_t engine_info;
253
166
256
169
* Helper function to insert pub and seckey to the engine keyring.
257
170
*/
258
171
bool import_key(const char *filename){
259
int ret;
260
172
int fd;
261
173
gpgme_data_t pgp_data;
262
174
263
175
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
176
if(fd == -1){
265
perror_plus("open");
177
perror("open");
266
178
return false;
267
179
}
268
180
269
181
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
182
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));
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
184
gpgme_strsource(rc), gpgme_strerror(rc));
273
185
return false;
274
186
}
275
187
276
188
rc = gpgme_op_import(mc.ctx, pgp_data);
277
189
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
280
192
return false;
281
193
}
282
194
283
195
ret = (int)TEMP_FAILURE_RETRY(close(fd));
284
196
if(ret == -1){
285
perror_plus("close");
197
perror("close");
286
198
}
287
199
gpgme_data_release(pgp_data);
288
200
return true;
289
201
}
290
202
291
203
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
204
fprintf(stderr, "Initializing GPGME\n");
293
205
}
294
206
295
207
/* Init GPGME */
296
208
gpgme_check_version(NULL);
297
209
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
210
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));
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
212
gpgme_strsource(rc), gpgme_strerror(rc));
301
213
return false;
302
214
}
303
215
304
/* Set GPGME home directory for the OpenPGP engine only */
216
/* Set GPGME home directory for the OpenPGP engine only */
305
217
rc = gpgme_get_engine_info(&engine_info);
306
218
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));
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
309
221
return false;
310
222
}
311
223
while(engine_info != NULL){
317
229
engine_info = engine_info->next;
318
230
}
319
231
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
322
233
return false;
323
234
}
324
235
325
236
/* Create new GPGME "context" */
326
237
rc = gpgme_new(&(mc.ctx));
327
238
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));
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
331
241
return false;
332
242
}
333
243
335
245
return false;
336
246
}
337
247
338
return true;
248
return true;
339
249
}
340
250
341
251
/*
352
262
ssize_t plaintext_length = 0;
353
263
354
264
if(debug){
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
266
}
357
267
358
268
/* Create new GPGME data buffer from memory cryptotext */
359
269
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
360
270
0);
361
271
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));
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
364
274
return -1;
365
275
}
366
276
367
277
/* Create new empty GPGME data buffer for the plaintext */
368
278
rc = gpgme_data_new(&dh_plain);
369
279
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));
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
373
282
gpgme_data_release(dh_crypto);
374
283
return -1;
375
284
}
378
287
data buffer */
379
288
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
289
if(rc != GPG_ERR_NO_ERROR){
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
383
292
plaintext_length = -1;
384
293
if(debug){
385
294
gpgme_decrypt_result_t result;
386
295
result = gpgme_op_decrypt_result(mc.ctx);
387
296
if(result == NULL){
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
298
} 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);
299
fprintf(stderr, "Unsupported algorithm: %s\n",
300
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
302
result->wrong_key_usage);
394
303
if(result->file_name != NULL){
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
304
fprintf(stderr, "File name: %s\n", result->file_name);
396
305
}
397
306
gpgme_recipient_t recipient;
398
307
recipient = result->recipients;
399
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");
407
recipient = recipient->next;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
408
318
}
409
319
}
410
320
}
412
322
}
413
323
414
324
if(debug){
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
326
}
417
327
418
328
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
330
perror("gpgme_data_seek");
421
331
plaintext_length = -1;
422
332
goto decrypt_end;
423
333
}
425
335
*plaintext = NULL;
426
336
while(true){
427
337
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
338
(size_t)plaintext_length,
339
plaintext_capacity);
430
340
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
341
perror("incbuffer");
342
plaintext_length = -1;
343
goto decrypt_end;
434
344
}
435
345
436
346
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
441
351
break;
442
352
}
443
353
if(ret < 0){
444
perror_plus("gpgme_data_read");
354
perror("gpgme_data_read");
445
355
plaintext_length = -1;
446
356
goto decrypt_end;
447
357
}
449
359
}
450
360
451
361
if(debug){
452
fprintf_plus(stderr, "Decrypted password is: ");
362
fprintf(stderr, "Decrypted password is: ");
453
363
for(ssize_t i = 0; i < plaintext_length; i++){
454
364
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
455
365
}
477
387
/* GnuTLS log function callback */
478
388
static void debuggnutls(__attribute__((unused)) int level,
479
389
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
390
fprintf(stderr, "GnuTLS: %s", string);
481
391
}
482
392
483
393
static int init_gnutls_global(const char *pubkeyfilename,
485
395
int ret;
486
396
487
397
if(debug){
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
398
fprintf(stderr, "Initializing GnuTLS\n");
489
399
}
490
400
491
401
ret = gnutls_global_init();
492
402
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
495
405
return -1;
496
406
}
497
407
504
414
}
505
415
506
416
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
417
gnutls_certificate_allocate_credentials(&mc.cred);
508
418
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
511
424
gnutls_global_deinit();
512
425
return -1;
513
426
}
514
427
515
428
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);
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
431
seckeyfilename);
520
432
}
521
433
522
434
ret = gnutls_certificate_set_openpgp_key_file
523
435
(mc.cred, pubkeyfilename, seckeyfilename,
524
436
GNUTLS_OPENPGP_FMT_BASE64);
525
437
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));
438
fprintf(stderr,
439
"Error[%d] while reading the OpenPGP key pair ('%s',"
440
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
441
fprintf(stderr, "The GnuTLS error is: %s\n",
442
safer_gnutls_strerror(ret));
531
443
goto globalfail;
532
444
}
533
445
534
446
/* GnuTLS server initialization */
535
447
ret = gnutls_dh_params_init(&mc.dh_params);
536
448
if(ret != GNUTLS_E_SUCCESS){
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
450
" %s\n", safer_gnutls_strerror(ret));
540
451
goto globalfail;
541
452
}
542
453
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
454
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
456
safer_gnutls_strerror(ret));
546
457
goto globalfail;
547
458
}
548
459
561
472
static int init_gnutls_session(gnutls_session_t *session){
562
473
int ret;
563
474
/* 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);
475
ret = gnutls_init(session, GNUTLS_SERVER);
570
476
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
478
safer_gnutls_strerror(ret));
574
479
}
575
480
576
481
{
577
482
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);
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
484
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));
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
589
488
gnutls_deinit(*session);
590
489
return -1;
591
490
}
592
491
}
593
492
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);
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
602
495
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
497
safer_gnutls_strerror(ret));
605
498
gnutls_deinit(*session);
606
499
return -1;
607
500
}
608
501
609
502
/* ignore client certificate if any. */
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
611
505
612
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
507
622
516
static int start_mandos_communication(const char *ip, uint16_t port,
623
517
AvahiIfIndex if_index,
624
518
int af){
625
int ret, tcp_sd = -1;
519
int ret, tcp_sd;
626
520
ssize_t sret;
627
521
union {
628
522
struct sockaddr_in in;
629
523
struct sockaddr_in6 in6;
630
524
} to;
631
525
char *buffer = NULL;
632
char *decrypted_buffer = NULL;
526
char *decrypted_buffer;
633
527
size_t buffer_length = 0;
634
528
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
635
530
size_t written;
636
int retval = -1;
531
int retval = 0;
637
532
gnutls_session_t session;
638
533
int pf; /* Protocol family */
639
534
640
errno = 0;
641
642
if(quit_now){
643
errno = EINTR;
644
return -1;
645
}
646
647
535
switch(af){
648
536
case AF_INET6:
649
537
pf = PF_INET6;
652
540
pf = PF_INET;
653
541
break;
654
542
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
656
errno = EINVAL;
543
fprintf(stderr, "Bad address family: %d\n", af);
657
544
return -1;
658
545
}
659
546
663
550
}
664
551
665
552
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
554
"\n", ip, port);
668
555
}
669
556
670
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
558
if(tcp_sd < 0){
672
int e = errno;
673
perror_plus("socket");
674
errno = e;
675
goto mandos_end;
676
}
677
678
if(quit_now){
679
errno = EINTR;
680
goto mandos_end;
559
perror("socket");
560
return -1;
681
561
}
682
562
683
563
memset(&to, 0, sizeof(to));
684
564
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
565
to.in6.sin6_family = (uint16_t)af;
686
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
687
567
} else { /* IPv4 */
688
568
to.in.sin_family = (sa_family_t)af;
689
569
ret = inet_pton(af, ip, &to.in.sin_addr);
690
570
}
691
571
if(ret < 0 ){
692
int e = errno;
693
perror_plus("inet_pton");
694
errno = e;
695
goto mandos_end;
572
perror("inet_pton");
573
return -1;
696
574
}
697
575
if(ret == 0){
698
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
700
errno = e;
701
goto mandos_end;
576
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
702
578
}
703
579
if(af == AF_INET6){
704
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
707
583
708
584
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
585
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
586
-Wunreachable-code*/
711
587
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;
715
goto mandos_end;
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
" without a network interface\n");
590
return -1;
716
591
}
717
592
/* Set the network interface number as scope */
718
593
to.in6.sin6_scope_id = (uint32_t)if_index;
723
598
-Wunreachable-code */
724
599
}
725
600
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
730
731
601
if(debug){
732
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
733
603
char interface[IF_NAMESIZE];
734
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
735
perror_plus("if_indextoname");
605
perror("if_indextoname");
736
606
} else {
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
608
ip, interface, port);
739
609
}
740
610
} else {
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
743
613
}
744
614
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
745
615
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
752
622
sizeof(addrstr));
753
623
}
754
624
if(pcret == NULL){
755
perror_plus("inet_ntop");
625
perror("inet_ntop");
756
626
} else {
757
627
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
759
629
}
760
630
}
761
631
}
762
632
763
if(quit_now){
764
errno = EINTR;
765
goto mandos_end;
766
}
767
768
633
if(af == AF_INET6){
769
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
770
635
} else {
771
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
772
637
}
773
638
if(ret < 0){
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
int e = errno;
776
perror_plus("connect");
777
errno = e;
778
}
779
goto mandos_end;
780
}
781
782
if(quit_now){
783
errno = EINTR;
784
goto mandos_end;
639
perror("connect");
640
return -1;
785
641
}
786
642
787
643
const char *out = mandos_protocol_version;
789
645
while(true){
790
646
size_t out_size = strlen(out);
791
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
792
out_size - written));
648
out_size - written));
793
649
if(ret == -1){
794
int e = errno;
795
perror_plus("write");
796
errno = e;
650
perror("write");
651
retval = -1;
797
652
goto mandos_end;
798
653
}
799
654
written += (size_t)ret;
807
662
break;
808
663
}
809
664
}
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
665
}
816
666
817
667
if(debug){
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
819
}
820
821
if(quit_now){
822
errno = EINTR;
823
goto mandos_end;
824
}
825
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);
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
835
}
836
837
do {
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
}
670
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
673
do{
838
674
ret = gnutls_handshake(session);
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
843
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
844
676
845
677
if(ret != GNUTLS_E_SUCCESS){
846
678
if(debug){
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
848
680
gnutls_perror(ret);
849
681
}
850
errno = EPROTO;
682
retval = -1;
851
683
goto mandos_end;
852
684
}
853
685
854
686
/* Read OpenPGP packet that contains the wanted password */
855
687
856
688
if(debug){
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
690
ip);
859
691
}
860
692
861
693
while(true){
862
863
if(quit_now){
864
errno = EINTR;
865
goto mandos_end;
866
}
867
868
694
buffer_capacity = incbuffer(&buffer, buffer_length,
869
buffer_capacity);
695
buffer_capacity);
870
696
if(buffer_capacity == 0){
871
int e = errno;
872
perror_plus("incbuffer");
873
errno = e;
874
goto mandos_end;
875
}
876
877
if(quit_now){
878
errno = EINTR;
697
perror("incbuffer");
698
retval = -1;
879
699
goto mandos_end;
880
700
}
881
701
890
710
case GNUTLS_E_AGAIN:
891
711
break;
892
712
case GNUTLS_E_REHANDSHAKE:
893
do {
713
do{
894
714
ret = gnutls_handshake(session);
895
896
if(quit_now){
897
errno = EINTR;
898
goto mandos_end;
899
}
900
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
901
716
if(ret < 0){
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
904
718
gnutls_perror(ret);
905
errno = EPROTO;
719
retval = -1;
906
720
goto mandos_end;
907
721
}
908
722
break;
909
723
default:
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
724
fprintf(stderr, "Unknown error while reading data from"
725
" encrypted session with Mandos server\n");
726
retval = -1;
912
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
913
errno = EIO;
914
728
goto mandos_end;
915
729
}
916
730
} else {
919
733
}
920
734
921
735
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);
736
fprintf(stderr, "Closing TLS session\n");
737
}
738
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
937
740
938
741
if(buffer_length > 0){
939
ssize_t decrypted_buffer_size;
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
buffer_length,
941
744
&decrypted_buffer);
942
745
if(decrypted_buffer_size >= 0){
943
944
746
written = 0;
945
747
while(written < (size_t) decrypted_buffer_size){
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
951
748
ret = (int)fwrite(decrypted_buffer + written, 1,
952
749
(size_t)decrypted_buffer_size - written,
953
750
stdout);
954
751
if(ret == 0 and ferror(stdout)){
955
int e = errno;
956
752
if(debug){
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
753
fprintf(stderr, "Error writing encrypted data: %s\n",
754
strerror(errno));
959
755
}
960
errno = e;
961
goto mandos_end;
756
retval = -1;
757
break;
962
758
}
963
759
written += (size_t)ret;
964
760
}
965
retval = 0;
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
966
764
}
765
} else {
766
retval = -1;
967
767
}
968
768
969
769
/* Shutdown procedure */
970
770
971
771
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
}
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
991
776
}
777
gnutls_deinit(session);
992
778
return retval;
993
779
}
994
780
1011
797
/* Called whenever a service has been resolved successfully or
1012
798
timed out */
1013
799
1014
if(quit_now){
1015
return;
1016
}
1017
1018
800
switch(event){
1019
801
default:
1020
802
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)));
803
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
804
" of type '%s' in domain '%s': %s\n", name, type, domain,
805
avahi_strerror(avahi_server_errno(mc.server)));
1025
806
break;
1026
807
1027
808
case AVAHI_RESOLVER_FOUND:
1029
810
char ip[AVAHI_ADDRESS_STR_MAX];
1030
811
avahi_address_snprint(ip, sizeof(ip), address);
1031
812
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);
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
814
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
ip, (intmax_t)interface, port);
1035
816
}
1036
817
int ret = start_mandos_communication(ip, port, interface,
1037
818
avahi_proto_to_af(proto));
1038
819
if(ret == 0){
1039
820
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
821
}
1047
822
}
1048
823
}
1064
839
/* Called whenever a new services becomes available on the LAN or
1065
840
is removed from the LAN */
1066
841
1067
if(quit_now){
1068
return;
1069
}
1070
1071
842
switch(event){
1072
843
default:
1073
844
case AVAHI_BROWSER_FAILURE:
1074
845
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
846
fprintf(stderr, "(Avahi browser) %s\n",
847
avahi_strerror(avahi_server_errno(mc.server)));
1077
848
avahi_simple_poll_quit(mc.simple_poll);
1078
849
return;
1079
850
1083
854
the callback function is called the Avahi server will free the
1084
855
resolver for us. */
1085
856
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
name, type, domain, protocol, 0,
1088
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)));
857
if(!(avahi_s_service_resolver_new(mc.server, interface,
858
protocol, name, type, domain,
859
AVAHI_PROTO_INET6, 0,
860
resolve_callback, NULL)))
861
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
862
name, avahi_strerror(avahi_server_errno(mc.server)));
1092
863
break;
1093
864
1094
865
case AVAHI_BROWSER_REMOVE:
1097
868
case AVAHI_BROWSER_ALL_FOR_NOW:
1098
869
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1099
870
if(debug){
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
871
fprintf(stderr, "No Mandos server found, still searching...\n");
1102
872
}
1103
873
break;
1104
874
}
1105
875
}
1106
876
1107
/* Signal handler that stops main loop after SIGTERM */
1108
static void handle_sigterm(int sig){
877
sig_atomic_t quit_now = 0;
878
879
/* stop main loop after sigterm has been called */
880
static void handle_sigterm(__attribute__((unused)) int sig){
1109
881
if(quit_now){
1110
882
return;
1111
883
}
1112
884
quit_now = 1;
1113
signal_received = sig;
1114
885
int old_errno = errno;
1115
/* set main loop to exit */
1116
886
if(mc.simple_poll != NULL){
1117
887
avahi_simple_poll_quit(mc.simple_poll);
1118
888
}
1119
889
errno = old_errno;
1120
890
}
1121
891
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 ret;
1567
struct ifreq network;
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1569
if(if_index == 0){
1570
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1571
return EX_UNAVAILABLE;
1572
}
1573
1574
if(quit_now){
1575
return EINTR;
1576
}
1577
1578
/* Re-raise priviliges */
1579
raise_privileges();
1580
1581
#ifdef __linux__
1582
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1583
messages about the network interface to mess up the prompt */
1584
ret = klogctl(8, NULL, 5);
1585
bool restore_loglevel = true;
1586
if(ret == -1){
1587
restore_loglevel = false;
1588
perror_plus("klogctl");
1589
}
1590
#endif /* __linux__ */
1591
1592
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1593
if(sd < 0){
1594
perror_plus("socket");
1595
#ifdef __linux__
1596
if(restore_loglevel){
1597
ret = klogctl(7, NULL, 0);
1598
if(ret == -1){
1599
perror_plus("klogctl");
1600
}
1601
}
1602
#endif /* __linux__ */
1603
/* Lower privileges */
1604
lower_privileges();
1605
return EX_OSERR;
1606
;
1607
}
1608
strcpy(network.ifr_name, interface);
1609
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1610
if(ret == -1){
1611
perror_plus("ioctl SIOCGIFFLAGS");
1612
#ifdef __linux__
1613
if(restore_loglevel){
1614
ret = klogctl(7, NULL, 0);
1615
if(ret == -1){
1616
perror_plus("klogctl");
1617
}
1618
}
1619
#endif /* __linux__ */
1620
/* Lower privileges */
1621
lower_privileges();
1622
return EX_OSERR;
1623
}
1624
if((network.ifr_flags & IFF_UP) == 0){
1625
network.ifr_flags |= IFF_UP;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
if(ret == -1){
1628
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1629
#ifdef __linux__
1630
if(restore_loglevel){
1631
ret = klogctl(7, NULL, 0);
1632
if(ret == -1){
1633
perror_plus("klogctl");
1634
}
1635
}
1636
#endif /* __linux__ */
1637
/* Lower privileges */
1638
lower_privileges();
1639
return EX_OSERR;
1640
}
1641
}
1642
/* Sleep checking until interface is running.
1643
Check every 0.25s, up to total time of delay */
1644
for(int i=0; i < delay * 4; i++){
1645
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1646
if(ret == -1){
1647
perror_plus("ioctl SIOCGIFFLAGS");
1648
} else if(network.ifr_flags & IFF_RUNNING){
1649
break;
1650
}
1651
struct timespec sleeptime = { .tv_nsec = 250000000 };
1652
ret = nanosleep(&sleeptime, NULL);
1653
if(ret == -1 and errno != EINTR){
1654
perror_plus("nanosleep");
1655
}
1656
}
1657
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1659
if(ret == -1){
1660
perror_plus("close");
1661
}
1662
#ifdef __linux__
1663
if(restore_loglevel){
1664
/* Restores kernel loglevel to default */
1665
ret = klogctl(7, NULL, 0);
1666
if(ret == -1){
1667
perror_plus("klogctl");
1668
}
1669
}
1670
#endif /* __linux__ */
1671
/* Lower privileges */
1672
lower_privileges();
1673
return errno;
1674
}
1675
1676
892
int main(int argc, char *argv[]){
1677
893
AvahiSServiceBrowser *sb = NULL;
1678
894
int error;
1680
896
intmax_t tmpmax;
1681
897
char *tmp;
1682
898
int exitcode = EXIT_SUCCESS;
1683
const char *interface = "";
899
const char *interface = "eth0";
1684
900
struct ifreq network;
1685
int sd = -1;
1686
bool take_down_interface = false;
901
int sd;
902
uid_t uid;
903
gid_t gid;
904
char *connect_to = NULL;
1687
905
char tempdir[] = "/tmp/mandosXXXXXX";
1688
906
bool tempdir_created = false;
1689
907
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1690
908
const char *seckey = PATHDIR "/" SECKEY;
1691
909
const char *pubkey = PATHDIR "/" PUBKEY;
1692
910
911
/* Initialize Mandos context */
912
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
913
.dh_bits = 1024, .priority = "SECURE256"
914
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1693
915
bool gnutls_initialized = false;
1694
916
bool gpgme_initialized = false;
1695
917
float delay = 2.5f;
1696
double retry_interval = 10; /* 10s between trying a server and
1697
retrying the same server again */
1698
918
1699
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
919
struct sigaction old_sigterm_action;
1700
920
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1701
921
1702
uid = getuid();
1703
gid = getgid();
1704
1705
/* Lower any group privileges we might have, just to be safe */
1706
errno = 0;
1707
ret = setgid(gid);
1708
if(ret == -1){
1709
perror_plus("setgid");
1710
}
1711
1712
/* Lower user privileges (temporarily) */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
1719
if(quit_now){
1720
goto end;
1721
}
1722
1723
922
{
1724
923
struct argp_option options[] = {
1725
924
{ .name = "debug", .key = 128,
1754
953
.arg = "SECONDS",
1755
954
.doc = "Maximum delay to wait for interface startup",
1756
955
.group = 2 },
1757
{ .name = "retry", .key = 132,
1758
.arg = "SECONDS",
1759
.doc = "Retry interval used when denied by the Mandos server",
1760
.group = 2 },
1761
{ .name = "network-hook-dir", .key = 133,
1762
.arg = "DIR",
1763
.doc = "Directory where network hooks are located",
1764
.group = 2 },
1765
/*
1766
* These reproduce what we would get without ARGP_NO_HELP
1767
*/
1768
{ .name = "help", .key = '?',
1769
.doc = "Give this help list", .group = -1 },
1770
{ .name = "usage", .key = -3,
1771
.doc = "Give a short usage message", .group = -1 },
1772
{ .name = "version", .key = 'V',
1773
.doc = "Print program version", .group = -1 },
1774
956
{ .name = NULL }
1775
957
};
1776
958
1777
959
error_t parse_opt(int key, char *arg,
1778
960
struct argp_state *state){
1779
errno = 0;
1780
961
switch(key){
1781
962
case 128: /* --debug */
1782
963
debug = true;
1798
979
tmpmax = strtoimax(arg, &tmp, 10);
1799
980
if(errno != 0 or tmp == arg or *tmp != '\0'
1800
981
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1801
argp_error(state, "Bad number of DH bits");
982
fprintf(stderr, "Bad number of DH bits\n");
983
exit(EXIT_FAILURE);
1802
984
}
1803
985
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1804
986
break;
1809
991
errno = 0;
1810
992
delay = strtof(arg, &tmp);
1811
993
if(errno != 0 or tmp == arg or *tmp != '\0'){
1812
argp_error(state, "Bad delay");
1813
}
1814
case 132: /* --retry */
1815
errno = 0;
1816
retry_interval = strtod(arg, &tmp);
1817
if(errno != 0 or tmp == arg or *tmp != '\0'
1818
or (retry_interval * 1000) > INT_MAX
1819
or retry_interval < 0){
1820
argp_error(state, "Bad retry interval");
1821
}
1822
break;
1823
case 133: /* --network-hook-dir */
1824
hookdir = arg;
1825
break;
1826
/*
1827
* These reproduce what we would get without ARGP_NO_HELP
1828
*/
1829
case '?': /* --help */
1830
argp_state_help(state, state->out_stream,
1831
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1832
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1833
case -3: /* --usage */
1834
argp_state_help(state, state->out_stream,
1835
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1836
case 'V': /* --version */
1837
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1838
exit(argp_err_exit_status);
994
fprintf(stderr, "Bad delay\n");
995
exit(EXIT_FAILURE);
996
}
997
break;
998
case ARGP_KEY_ARG:
999
argp_usage(state);
1000
case ARGP_KEY_END:
1839
1001
break;
1840
1002
default:
1841
1003
return ARGP_ERR_UNKNOWN;
1842
1004
}
1843
return errno;
1005
return 0;
1844
1006
}
1845
1007
1846
1008
struct argp argp = { .options = options, .parser = parse_opt,
1847
1009
.args_doc = "",
1848
1010
.doc = "Mandos client -- Get and decrypt"
1849
1011
" passwords from a Mandos server" };
1850
ret = argp_parse(&argp, argc, argv,
1851
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1852
switch(ret){
1853
case 0:
1854
break;
1855
case ENOMEM:
1856
default:
1857
errno = ret;
1858
perror_plus("argp_parse");
1859
exitcode = EX_OSERR;
1860
goto end;
1861
case EINVAL:
1862
exitcode = EX_USAGE;
1863
goto end;
1864
}
1865
}
1866
1867
{
1868
/* Work around Debian bug #633582:
1869
<http://bugs.debian.org/633582> */
1870
1871
/* Re-raise priviliges */
1872
if(raise_privileges() == 0){
1873
struct stat st;
1874
1875
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1876
int seckey_fd = open(seckey, O_RDONLY);
1877
if(seckey_fd == -1){
1878
perror_plus("open");
1879
} else {
1880
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1881
if(ret == -1){
1882
perror_plus("fstat");
1883
} else {
1884
if(S_ISREG(st.st_mode)
1885
and st.st_uid == 0 and st.st_gid == 0){
1886
ret = fchown(seckey_fd, uid, gid);
1887
if(ret == -1){
1888
perror_plus("fchown");
1889
}
1890
}
1891
}
1892
TEMP_FAILURE_RETRY(close(seckey_fd));
1893
}
1894
}
1895
1896
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1897
int pubkey_fd = open(pubkey, O_RDONLY);
1898
if(pubkey_fd == -1){
1899
perror_plus("open");
1900
} else {
1901
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1902
if(ret == -1){
1903
perror_plus("fstat");
1904
} else {
1905
if(S_ISREG(st.st_mode)
1906
and st.st_uid == 0 and st.st_gid == 0){
1907
ret = fchown(pubkey_fd, uid, gid);
1908
if(ret == -1){
1909
perror_plus("fchown");
1910
}
1911
}
1912
}
1913
TEMP_FAILURE_RETRY(close(pubkey_fd));
1914
}
1915
}
1916
1917
/* Lower privileges */
1918
errno = 0;
1919
ret = seteuid(uid);
1920
if(ret == -1){
1921
perror_plus("seteuid");
1922
}
1923
}
1924
}
1925
1926
/* Run network hooks */
1927
if(not run_network_hooks("start", interface, delay)){
1928
goto end;
1012
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1013
if(ret == ARGP_ERR_UNKNOWN){
1014
fprintf(stderr, "Unknown error while parsing arguments\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1929
1018
}
1930
1019
1931
1020
if(not debug){
1932
1021
avahi_set_log_function(empty_log);
1933
1022
}
1934
1023
1935
if(interface[0] == '\0'){
1936
struct dirent **direntries;
1937
/* First look for interfaces that are up */
1938
ret = scandir(sys_class_net, &direntries, up_interface,
1939
alphasort);
1940
if(ret == 0){
1941
/* No up interfaces, look for any good interfaces */
1942
free(direntries);
1943
ret = scandir(sys_class_net, &direntries, good_interface,
1944
alphasort);
1945
}
1946
if(ret >= 1){
1947
/* Pick the first interface returned */
1948
interface = strdup(direntries[0]->d_name);
1949
if(debug){
1950
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1951
}
1952
if(interface == NULL){
1953
perror_plus("malloc");
1954
free(direntries);
1955
exitcode = EXIT_FAILURE;
1956
goto end;
1957
}
1958
free(direntries);
1959
} else {
1960
free(direntries);
1961
fprintf_plus(stderr, "Could not find a network interface\n");
1962
exitcode = EXIT_FAILURE;
1963
goto end;
1964
}
1965
}
1966
1967
1024
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1968
1025
from the signal handler */
1969
1026
/* Initialize the pseudo-RNG for Avahi */
1970
1027
srand((unsigned int) time(NULL));
1971
1028
mc.simple_poll = avahi_simple_poll_new();
1972
1029
if(mc.simple_poll == NULL){
1973
fprintf_plus(stderr,
1974
"Avahi: Failed to create simple poll object.\n");
1975
exitcode = EX_UNAVAILABLE;
1030
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1031
exitcode = EXIT_FAILURE;
1976
1032
goto end;
1977
1033
}
1978
1034
1979
1035
sigemptyset(&sigterm_action.sa_mask);
1980
1036
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1981
1037
if(ret == -1){
1982
perror_plus("sigaddset");
1983
exitcode = EX_OSERR;
1038
perror("sigaddset");
1039
exitcode = EXIT_FAILURE;
1984
1040
goto end;
1985
1041
}
1986
1042
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1987
1043
if(ret == -1){
1988
perror_plus("sigaddset");
1989
exitcode = EX_OSERR;
1044
perror("sigaddset");
1045
exitcode = EXIT_FAILURE;
1990
1046
goto end;
1991
1047
}
1992
1048
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1993
1049
if(ret == -1){
1994
perror_plus("sigaddset");
1995
exitcode = EX_OSERR;
1996
goto end;
1997
}
1998
/* Need to check if the handler is SIG_IGN before handling:
1999
| [[info:libc:Initial Signal Actions]] |
2000
| [[info:libc:Basic Signal Handling]] |
2001
*/
2002
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2003
if(ret == -1){
2004
perror_plus("sigaction");
2005
return EX_OSERR;
2006
}
2007
if(old_sigterm_action.sa_handler != SIG_IGN){
2008
ret = sigaction(SIGINT, &sigterm_action, NULL);
2009
if(ret == -1){
2010
perror_plus("sigaction");
2011
exitcode = EX_OSERR;
2012
goto end;
2013
}
2014
}
2015
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2016
if(ret == -1){
2017
perror_plus("sigaction");
2018
return EX_OSERR;
2019
}
2020
if(old_sigterm_action.sa_handler != SIG_IGN){
2021
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2022
if(ret == -1){
2023
perror_plus("sigaction");
2024
exitcode = EX_OSERR;
2025
goto end;
2026
}
2027
}
2028
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2029
if(ret == -1){
2030
perror_plus("sigaction");
2031
return EX_OSERR;
2032
}
2033
if(old_sigterm_action.sa_handler != SIG_IGN){
2034
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2035
if(ret == -1){
2036
perror_plus("sigaction");
2037
exitcode = EX_OSERR;
2038
goto end;
2039
}
2040
}
1050
perror("sigaddset");
1051
exitcode = EXIT_FAILURE;
1052
goto end;
1053
}
1054
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1055
if(ret == -1){
1056
perror("sigaction");
1057
exitcode = EXIT_FAILURE;
1058
goto end;
1059
}
2041
1060
2042
1061
/* If the interface is down, bring it up */
2043
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2044
ret = bring_up_interface(interface, delay);
2045
if(ret){
2046
errno = ret;
2047
perror_plus("Failed to bring up interface");
2048
}
2049
}
2050
2051
if(quit_now){
2052
goto end;
1062
if(interface[0] != '\0'){
1063
#ifdef __linux__
1064
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1065
messages to mess up the prompt */
1066
ret = klogctl(8, NULL, 5);
1067
bool restore_loglevel = true;
1068
if(ret == -1){
1069
restore_loglevel = false;
1070
perror("klogctl");
1071
}
1072
#endif /* __linux__ */
1073
1074
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1075
if(sd < 0){
1076
perror("socket");
1077
exitcode = EXIT_FAILURE;
1078
#ifdef __linux__
1079
if(restore_loglevel){
1080
ret = klogctl(7, NULL, 0);
1081
if(ret == -1){
1082
perror("klogctl");
1083
}
1084
}
1085
#endif /* __linux__ */
1086
goto end;
1087
}
1088
strcpy(network.ifr_name, interface);
1089
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1090
if(ret == -1){
1091
perror("ioctl SIOCGIFFLAGS");
1092
#ifdef __linux__
1093
if(restore_loglevel){
1094
ret = klogctl(7, NULL, 0);
1095
if(ret == -1){
1096
perror("klogctl");
1097
}
1098
}
1099
#endif /* __linux__ */
1100
exitcode = EXIT_FAILURE;
1101
goto end;
1102
}
1103
if((network.ifr_flags & IFF_UP) == 0){
1104
network.ifr_flags |= IFF_UP;
1105
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1106
if(ret == -1){
1107
perror("ioctl SIOCSIFFLAGS");
1108
exitcode = EXIT_FAILURE;
1109
#ifdef __linux__
1110
if(restore_loglevel){
1111
ret = klogctl(7, NULL, 0);
1112
if(ret == -1){
1113
perror("klogctl");
1114
}
1115
}
1116
#endif /* __linux__ */
1117
goto end;
1118
}
1119
}
1120
/* sleep checking until interface is running */
1121
for(int i=0; i < delay * 4; i++){
1122
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1123
if(ret == -1){
1124
perror("ioctl SIOCGIFFLAGS");
1125
} else if(network.ifr_flags & IFF_RUNNING){
1126
break;
1127
}
1128
struct timespec sleeptime = { .tv_nsec = 250000000 };
1129
ret = nanosleep(&sleeptime, NULL);
1130
if(ret == -1 and errno != EINTR){
1131
perror("nanosleep");
1132
}
1133
}
1134
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1135
if(ret == -1){
1136
perror("close");
1137
}
1138
#ifdef __linux__
1139
if(restore_loglevel){
1140
/* Restores kernel loglevel to default */
1141
ret = klogctl(7, NULL, 0);
1142
if(ret == -1){
1143
perror("klogctl");
1144
}
1145
}
1146
#endif /* __linux__ */
1147
}
1148
1149
uid = getuid();
1150
gid = getgid();
1151
1152
errno = 0;
1153
setgid(gid);
1154
if(ret == -1){
1155
perror("setgid");
1156
}
1157
1158
ret = setuid(uid);
1159
if(ret == -1){
1160
perror("setuid");
2053
1161
}
2054
1162
2055
1163
ret = init_gnutls_global(pubkey, seckey);
2056
1164
if(ret == -1){
2057
fprintf_plus(stderr, "init_gnutls_global failed\n");
2058
exitcode = EX_UNAVAILABLE;
1165
fprintf(stderr, "init_gnutls_global failed\n");
1166
exitcode = EXIT_FAILURE;
2059
1167
goto end;
2060
1168
} else {
2061
1169
gnutls_initialized = true;
2062
1170
}
2063
1171
2064
if(quit_now){
2065
goto end;
2066
}
2067
2068
1172
if(mkdtemp(tempdir) == NULL){
2069
perror_plus("mkdtemp");
1173
perror("mkdtemp");
2070
1174
goto end;
2071
1175
}
2072
1176
tempdir_created = true;
2073
1177
2074
if(quit_now){
2075
goto end;
2076
}
2077
2078
1178
if(not init_gpgme(pubkey, seckey, tempdir)){
2079
fprintf_plus(stderr, "init_gpgme failed\n");
2080
exitcode = EX_UNAVAILABLE;
1179
fprintf(stderr, "init_gpgme failed\n");
1180
exitcode = EXIT_FAILURE;
2081
1181
goto end;
2082
1182
} else {
2083
1183
gpgme_initialized = true;
2084
1184
}
2085
1185
2086
if(quit_now){
2087
goto end;
1186
if(interface[0] != '\0'){
1187
if_index = (AvahiIfIndex) if_nametoindex(interface);
1188
if(if_index == 0){
1189
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1190
exitcode = EXIT_FAILURE;
1191
goto end;
1192
}
2088
1193
}
2089
1194
2090
1195
if(connect_to != NULL){
2091
1196
/* Connect directly, do not use Zeroconf */
2092
1197
/* (Mainly meant for debugging) */
2093
1198
char *address = strrchr(connect_to, ':');
2094
2095
1199
if(address == NULL){
2096
fprintf_plus(stderr, "No colon in address\n");
2097
exitcode = EX_USAGE;
2098
goto end;
2099
}
2100
2101
if(quit_now){
2102
goto end;
2103
}
2104
1200
fprintf(stderr, "No colon in address\n");
1201
exitcode = EXIT_FAILURE;
1202
goto end;
1203
}
2105
1204
uint16_t port;
2106
1205
errno = 0;
2107
1206
tmpmax = strtoimax(address+1, &tmp, 10);
2108
1207
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2109
1208
or tmpmax != (uint16_t)tmpmax){
2110
fprintf_plus(stderr, "Bad port number\n");
2111
exitcode = EX_USAGE;
2112
goto end;
2113
}
2114
2115
if(quit_now){
2116
goto end;
2117
}
2118
1209
fprintf(stderr, "Bad port number\n");
1210
exitcode = EXIT_FAILURE;
1211
goto end;
1212
}
2119
1213
port = (uint16_t)tmpmax;
2120
1214
*address = '\0';
1215
address = connect_to;
2121
1216
/* Colon in address indicates IPv6 */
2122
1217
int af;
2123
if(strchr(connect_to, ':') != NULL){
1218
if(strchr(address, ':') != NULL){
2124
1219
af = AF_INET6;
2125
/* Accept [] around IPv6 address - see RFC 5952 */
2126
if(connect_to[0] == '[' and address[-1] == ']')
2127
{
2128
connect_to++;
2129
address[-1] = '\0';
2130
}
2131
1220
} else {
2132
1221
af = AF_INET;
2133
1222
}
2134
address = connect_to;
2135
2136
if(quit_now){
2137
goto end;
2138
}
2139
2140
while(not quit_now){
2141
ret = start_mandos_communication(address, port, if_index, af);
2142
if(quit_now or ret == 0){
2143
break;
2144
}
2145
if(debug){
2146
fprintf_plus(stderr, "Retrying in %d seconds\n",
2147
(int)retry_interval);
2148
}
2149
sleep((int)retry_interval);
2150
}
2151
2152
if (not quit_now){
1223
ret = start_mandos_communication(address, port, if_index, af);
1224
if(ret < 0){
1225
exitcode = EXIT_FAILURE;
1226
} else {
2153
1227
exitcode = EXIT_SUCCESS;
2154
1228
}
1229
goto end;
1230
}
2155
1231
2156
goto end;
2157
}
2158
2159
if(quit_now){
2160
goto end;
2161
}
2162
2163
1232
{
2164
1233
AvahiServerConfig config;
2165
1234
/* Do not publish any local Zeroconf records */
2180
1249
2181
1250
/* Check if creating the Avahi server object succeeded */
2182
1251
if(mc.server == NULL){
2183
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2184
avahi_strerror(error));
2185
exitcode = EX_UNAVAILABLE;
2186
goto end;
2187
}
2188
2189
if(quit_now){
1252
fprintf(stderr, "Failed to create Avahi server: %s\n",
1253
avahi_strerror(error));
1254
exitcode = EXIT_FAILURE;
2190
1255
goto end;
2191
1256
}
2192
1257
2193
1258
/* Create the Avahi service browser */
2194
1259
sb = avahi_s_service_browser_new(mc.server, if_index,
2195
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
AVAHI_PROTO_INET6, "_mandos._tcp",
2196
1261
NULL, 0, browse_callback, NULL);
2197
1262
if(sb == NULL){
2198
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2199
avahi_strerror(avahi_server_errno(mc.server)));
2200
exitcode = EX_UNAVAILABLE;
2201
goto end;
2202
}
2203
2204
if(quit_now){
1263
fprintf(stderr, "Failed to create service browser: %s\n",
1264
avahi_strerror(avahi_server_errno(mc.server)));
1265
exitcode = EXIT_FAILURE;
2205
1266
goto end;
2206
1267
}
2207
1268
2208
1269
/* Run the main loop */
2209
1270
2210
1271
if(debug){
2211
fprintf_plus(stderr, "Starting Avahi loop search\n");
2212
}
2213
2214
ret = avahi_loop_with_timeout(mc.simple_poll,
2215
(int)(retry_interval * 1000));
2216
if(debug){
2217
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2218
(ret == 0) ? "successfully" : "with error");
2219
}
1272
fprintf(stderr, "Starting Avahi loop search\n");
1273
}
1274
1275
avahi_simple_poll_loop(mc.simple_poll);
2220
1276
2221
1277
end:
2222
1278
2223
1279
if(debug){
2224
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1280
fprintf(stderr, "%s exiting\n", argv[0]);
2225
1281
}
2226
1282
2227
1283
/* Cleanup things */
2244
1300
gpgme_release(mc.ctx);
2245
1301
}
2246
1302
2247
/* Cleans up the circular linked list of Mandos servers the client
2248
has seen */
2249
if(mc.current_server != NULL){
2250
mc.current_server->prev->next = NULL;
2251
while(mc.current_server != NULL){
2252
server *next = mc.current_server->next;
2253
free(mc.current_server);
2254
mc.current_server = next;
2255
}
2256
}
2257
2258
/* Run network hooks */
2259
run_network_hooks("stop", interface, delay);
2260
2261
/* Re-raise priviliges */
2262
{
2263
raise_privileges();
2264
2265
/* Take down the network interface */
2266
if(take_down_interface and geteuid() == 0){
2267
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2268
if(ret == -1){
2269
perror_plus("ioctl SIOCGIFFLAGS");
2270
} else if(network.ifr_flags & IFF_UP){
2271
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2272
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2273
if(ret == -1){
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2275
}
2276
}
2277
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2278
if(ret == -1){
2279
perror_plus("close");
2280
}
2281
}
2282
}
2283
/* Lower privileges permanently */
2284
errno = 0;
2285
ret = setuid(uid);
2286
if(ret == -1){
2287
perror_plus("setuid");
2288
}
2289
2290
/* Removes the GPGME temp directory and all files inside */
1303
/* Removes the temp directory used by GPGME */
2291
1304
if(tempdir_created){
2292
struct dirent **direntries = NULL;
2293
struct dirent *direntry = NULL;
2294
int numentries = scandir(tempdir, &direntries, notdotentries,
2295
alphasort);
2296
if (numentries > 0){
2297
for(int i = 0; i < numentries; i++){
2298
direntry = direntries[i];
1305
DIR *d;
1306
struct dirent *direntry;
1307
d = opendir(tempdir);
1308
if(d == NULL){
1309
if(errno != ENOENT){
1310
perror("opendir");
1311
}
1312
} else {
1313
while(true){
1314
direntry = readdir(d);
1315
if(direntry == NULL){
1316
break;
1317
}
1318
/* Skip "." and ".." */
1319
if(direntry->d_name[0] == '.'
1320
and (direntry->d_name[1] == '\0'
1321
or (direntry->d_name[1] == '.'
1322
and direntry->d_name[2] == '\0'))){
1323
continue;
1324
}
2299
1325
char *fullname = NULL;
2300
1326
ret = asprintf(&fullname, "%s/%s", tempdir,
2301
1327
direntry->d_name);
2302
1328
if(ret < 0){
2303
perror_plus("asprintf");
1329
perror("asprintf");
2304
1330
continue;
2305
1331
}
2306
1332
ret = remove(fullname);
2307
1333
if(ret == -1){
2308
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2309
strerror(errno));
1334
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1335
strerror(errno));
2310
1336
}
2311
1337
free(fullname);
2312
1338
}
2313
}
2314
2315
/* need to clean even if 0 because man page doesn't specify */
2316
free(direntries);
2317
if (numentries == -1){
2318
perror_plus("scandir");
1339
closedir(d);
2319
1340
}
2320
1341
ret = rmdir(tempdir);
2321
1342
if(ret == -1 and errno != ENOENT){
2322
perror_plus("rmdir");
2323
}
2324
}
2325
2326
if(quit_now){
2327
sigemptyset(&old_sigterm_action.sa_mask);
2328
old_sigterm_action.sa_handler = SIG_DFL;
2329
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2330
&old_sigterm_action,
2331
NULL));
2332
if(ret == -1){
2333
perror_plus("sigaction");
2334
}
2335
do {
2336
ret = raise(signal_received);
2337
} while(ret != 0 and errno == EINTR);
2338
if(ret != 0){
2339
perror_plus("raise");
2340
abort();
2341
}
2342
TEMP_FAILURE_RETRY(pause());
1343
perror("rmdir");
1344
}
2343
1345
}
2344
1346
2345
1347
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0