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237.2.81
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-02-15 09:09:27 UTC
- mto: (237.4.2 mandos-pipe-ipc) (24.1.137 mandos) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 252.
- Revision ID: teddy@fukt.bsnet.se-20090215090927-sij7pzw24jg5njdy
* Makefile (common.ent): Update "version" entity correctly.
* mandos-clients.conf.xml (OPTIONS): Corrected old mistake.
* mandos-clients.conf.xml (OPTIONS): Corrected old mistake.
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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() */
43
43
stdout, ferror(), remove() */
44
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 */
72
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
72
*/
74
73
#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() */
74
getuid(), getgid(), setuid(),
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,
81
80
argp_parse(), ARGP_KEY_ARG,
82
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
82
#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() */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
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
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
128
150
129
/* Used for passing in values through the Avahi callback functions */
151
130
typedef struct {
156
135
gnutls_dh_params_t dh_params;
157
136
const char *priority;
158
137
gpgme_ctx_t ctx;
159
server *current_server;
160
138
} mandos_context;
161
139
162
140
/* global context so signal handler can reach it*/
163
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
142
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
167
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
186
144
187
145
/*
188
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
190
148
* "buffer_length" is how much is already used.
191
149
*/
192
150
size_t incbuffer(char **buffer, size_t buffer_length,
193
size_t buffer_capacity){
151
size_t buffer_capacity){
194
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
154
if(buffer == NULL){
201
159
return buffer_capacity;
202
160
}
203
161
204
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
207
int ret;
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
211
return -1;
212
}
213
*new_server = (server){ .ip = strdup(ip),
214
.port = port,
215
.if_index = if_index,
216
.af = af };
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
219
return -1;
220
}
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
227
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
239
}
240
241
162
/*
242
163
* Initialize GPGME.
243
164
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
246
168
gpgme_error_t rc;
247
169
gpgme_engine_info_t engine_info;
248
170
251
173
* Helper function to insert pub and seckey to the engine keyring.
252
174
*/
253
175
bool import_key(const char *filename){
254
int ret;
255
176
int fd;
256
177
gpgme_data_t pgp_data;
257
178
258
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
259
180
if(fd == -1){
260
perror_plus("open");
181
perror("open");
261
182
return false;
262
183
}
263
184
264
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
265
186
if(rc != GPG_ERR_NO_ERROR){
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
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));
268
189
return false;
269
190
}
270
191
271
192
rc = gpgme_op_import(mc.ctx, pgp_data);
272
193
if(rc != GPG_ERR_NO_ERROR){
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
275
196
return false;
276
197
}
277
198
278
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
200
if(ret == -1){
280
perror_plus("close");
201
perror("close");
281
202
}
282
203
gpgme_data_release(pgp_data);
283
204
return true;
284
205
}
285
206
286
207
if(debug){
287
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
288
209
}
289
210
290
211
/* Init GPGME */
291
212
gpgme_check_version(NULL);
292
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
293
214
if(rc != GPG_ERR_NO_ERROR){
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
296
217
return false;
297
218
}
298
219
299
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
300
221
rc = gpgme_get_engine_info(&engine_info);
301
222
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
304
225
return false;
305
226
}
306
227
while(engine_info != NULL){
312
233
engine_info = engine_info->next;
313
234
}
314
235
if(engine_info == NULL){
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
317
237
return false;
318
238
}
319
239
320
240
/* Create new GPGME "context" */
321
241
rc = gpgme_new(&(mc.ctx));
322
242
if(rc != GPG_ERR_NO_ERROR){
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
326
245
return false;
327
246
}
328
247
330
249
return false;
331
250
}
332
251
333
return true;
252
return true;
334
253
}
335
254
336
255
/*
347
266
ssize_t plaintext_length = 0;
348
267
349
268
if(debug){
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
351
270
}
352
271
353
272
/* Create new GPGME data buffer from memory cryptotext */
354
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
355
274
0);
356
275
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
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));
359
278
return -1;
360
279
}
361
280
362
281
/* Create new empty GPGME data buffer for the plaintext */
363
282
rc = gpgme_data_new(&dh_plain);
364
283
if(rc != GPG_ERR_NO_ERROR){
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
368
286
gpgme_data_release(dh_crypto);
369
287
return -1;
370
288
}
373
291
data buffer */
374
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
375
293
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
378
296
plaintext_length = -1;
379
297
if(debug){
380
298
gpgme_decrypt_result_t result;
381
299
result = gpgme_op_decrypt_result(mc.ctx);
382
300
if(result == NULL){
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
302
} else {
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
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);
389
307
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
391
309
}
392
310
gpgme_recipient_t recipient;
393
311
recipient = result->recipients;
394
while(recipient != NULL){
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
402
recipient = recipient->next;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
403
322
}
404
323
}
405
324
}
407
326
}
408
327
409
328
if(debug){
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
330
}
412
331
413
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
414
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
415
perror_plus("gpgme_data_seek");
334
perror("gpgme_data_seek");
416
335
plaintext_length = -1;
417
336
goto decrypt_end;
418
337
}
420
339
*plaintext = NULL;
421
340
while(true){
422
341
plaintext_capacity = incbuffer(plaintext,
423
(size_t)plaintext_length,
424
plaintext_capacity);
342
(size_t)plaintext_length,
343
plaintext_capacity);
425
344
if(plaintext_capacity == 0){
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
429
348
}
430
349
431
350
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
436
355
break;
437
356
}
438
357
if(ret < 0){
439
perror_plus("gpgme_data_read");
358
perror("gpgme_data_read");
440
359
plaintext_length = -1;
441
360
goto decrypt_end;
442
361
}
444
363
}
445
364
446
365
if(debug){
447
fprintf_plus(stderr, "Decrypted password is: ");
366
fprintf(stderr, "Decrypted password is: ");
448
367
for(ssize_t i = 0; i < plaintext_length; i++){
449
368
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
450
369
}
472
391
/* GnuTLS log function callback */
473
392
static void debuggnutls(__attribute__((unused)) int level,
474
393
const char* string){
475
fprintf_plus(stderr, "GnuTLS: %s", string);
394
fprintf(stderr, "GnuTLS: %s", string);
476
395
}
477
396
478
397
static int init_gnutls_global(const char *pubkeyfilename,
480
399
int ret;
481
400
482
401
if(debug){
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
402
fprintf(stderr, "Initializing GnuTLS\n");
484
403
}
485
404
486
405
ret = gnutls_global_init();
487
406
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
490
409
return -1;
491
410
}
492
411
499
418
}
500
419
501
420
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
421
gnutls_certificate_allocate_credentials(&mc.cred);
503
422
if(ret != GNUTLS_E_SUCCESS){
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
506
428
gnutls_global_deinit();
507
429
return -1;
508
430
}
509
431
510
432
if(debug){
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
515
436
}
516
437
517
438
ret = gnutls_certificate_set_openpgp_key_file
518
439
(mc.cred, pubkeyfilename, seckeyfilename,
519
440
GNUTLS_OPENPGP_FMT_BASE64);
520
441
if(ret != GNUTLS_E_SUCCESS){
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
442
fprintf(stderr,
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
526
447
goto globalfail;
527
448
}
528
449
529
450
/* GnuTLS server initialization */
530
451
ret = gnutls_dh_params_init(&mc.dh_params);
531
452
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
535
455
goto globalfail;
536
456
}
537
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
458
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
541
461
goto globalfail;
542
462
}
543
463
556
476
static int init_gnutls_session(gnutls_session_t *session){
557
477
int ret;
558
478
/* GnuTLS session creation */
559
do {
560
ret = gnutls_init(session, GNUTLS_SERVER);
561
if(quit_now){
562
return -1;
563
}
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
479
ret = gnutls_init(session, GNUTLS_SERVER);
565
480
if(ret != GNUTLS_E_SUCCESS){
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
569
483
}
570
484
571
485
{
572
486
const char *err;
573
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
575
if(quit_now){
576
gnutls_deinit(*session);
577
return -1;
578
}
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
488
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
584
492
gnutls_deinit(*session);
585
493
return -1;
586
494
}
587
495
}
588
496
589
do {
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
592
if(quit_now){
593
gnutls_deinit(*session);
594
return -1;
595
}
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
597
499
if(ret != GNUTLS_E_SUCCESS){
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
safer_gnutls_strerror(ret));
600
502
gnutls_deinit(*session);
601
503
return -1;
602
504
}
603
505
604
506
/* ignore client certificate if any. */
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
606
509
607
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
608
511
617
520
static int start_mandos_communication(const char *ip, uint16_t port,
618
521
AvahiIfIndex if_index,
619
522
int af){
620
int ret, tcp_sd = -1;
523
int ret, tcp_sd;
621
524
ssize_t sret;
622
525
union {
623
526
struct sockaddr_in in;
624
527
struct sockaddr_in6 in6;
625
528
} to;
626
529
char *buffer = NULL;
627
char *decrypted_buffer = NULL;
530
char *decrypted_buffer;
628
531
size_t buffer_length = 0;
629
532
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
630
534
size_t written;
631
int retval = -1;
535
int retval = 0;
632
536
gnutls_session_t session;
633
537
int pf; /* Protocol family */
634
538
635
errno = 0;
636
637
if(quit_now){
638
errno = EINTR;
639
return -1;
640
}
641
642
539
switch(af){
643
540
case AF_INET6:
644
541
pf = PF_INET6;
647
544
pf = PF_INET;
648
545
break;
649
546
default:
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
651
errno = EINVAL;
547
fprintf(stderr, "Bad address family: %d\n", af);
652
548
return -1;
653
549
}
654
550
658
554
}
659
555
660
556
if(debug){
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
663
559
}
664
560
665
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
666
562
if(tcp_sd < 0){
667
int e = errno;
668
perror_plus("socket");
669
errno = e;
670
goto mandos_end;
671
}
672
673
if(quit_now){
674
errno = EINTR;
675
goto mandos_end;
563
perror("socket");
564
return -1;
676
565
}
677
566
678
567
memset(&to, 0, sizeof(to));
679
568
if(af == AF_INET6){
680
to.in6.sin6_family = (sa_family_t)af;
569
to.in6.sin6_family = (uint16_t)af;
681
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
682
571
} else { /* IPv4 */
683
572
to.in.sin_family = (sa_family_t)af;
684
573
ret = inet_pton(af, ip, &to.in.sin_addr);
685
574
}
686
575
if(ret < 0 ){
687
int e = errno;
688
perror_plus("inet_pton");
689
errno = e;
690
goto mandos_end;
576
perror("inet_pton");
577
return -1;
691
578
}
692
579
if(ret == 0){
693
int e = errno;
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
695
errno = e;
696
goto mandos_end;
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
697
582
}
698
583
if(af == AF_INET6){
699
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
702
587
703
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
590
-Wunreachable-code*/
706
591
if(if_index == AVAHI_IF_UNSPEC){
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
709
errno = EINVAL;
710
goto mandos_end;
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
711
595
}
712
596
/* Set the network interface number as scope */
713
597
to.in6.sin6_scope_id = (uint32_t)if_index;
718
602
-Wunreachable-code */
719
603
}
720
604
721
if(quit_now){
722
errno = EINTR;
723
goto mandos_end;
724
}
725
726
605
if(debug){
727
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
728
607
char interface[IF_NAMESIZE];
729
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
perror_plus("if_indextoname");
609
perror("if_indextoname");
731
610
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
734
613
}
735
614
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
738
617
}
739
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
747
626
sizeof(addrstr));
748
627
}
749
628
if(pcret == NULL){
750
perror_plus("inet_ntop");
629
perror("inet_ntop");
751
630
} else {
752
631
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
633
}
755
634
}
756
635
}
757
636
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
637
if(af == AF_INET6){
764
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
639
} else {
766
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
641
}
768
642
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
goto mandos_end;
643
perror("connect");
644
return -1;
780
645
}
781
646
782
647
const char *out = mandos_protocol_version;
784
649
while(true){
785
650
size_t out_size = strlen(out);
786
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
787
out_size - written));
652
out_size - written));
788
653
if(ret == -1){
789
int e = errno;
790
perror_plus("write");
791
errno = e;
654
perror("write");
655
retval = -1;
792
656
goto mandos_end;
793
657
}
794
658
written += (size_t)ret;
802
666
break;
803
667
}
804
668
}
805
806
if(quit_now){
807
errno = EINTR;
808
goto mandos_end;
809
}
810
669
}
811
670
812
671
if(debug){
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
814
}
815
816
if(quit_now){
817
errno = EINTR;
818
goto mandos_end;
819
}
820
821
/* Spurious warning from -Wint-to-pointer-cast */
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
822
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
823
676
824
if(quit_now){
825
errno = EINTR;
826
goto mandos_end;
827
}
828
829
do {
677
do{
830
678
ret = gnutls_handshake(session);
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
834
}
835
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
836
680
837
681
if(ret != GNUTLS_E_SUCCESS){
838
682
if(debug){
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
840
684
gnutls_perror(ret);
841
685
}
842
errno = EPROTO;
686
retval = -1;
843
687
goto mandos_end;
844
688
}
845
689
846
690
/* Read OpenPGP packet that contains the wanted password */
847
691
848
692
if(debug){
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
851
695
}
852
696
853
697
while(true){
854
855
if(quit_now){
856
errno = EINTR;
857
goto mandos_end;
858
}
859
860
698
buffer_capacity = incbuffer(&buffer, buffer_length,
861
buffer_capacity);
699
buffer_capacity);
862
700
if(buffer_capacity == 0){
863
int e = errno;
864
perror_plus("incbuffer");
865
errno = e;
866
goto mandos_end;
867
}
868
869
if(quit_now){
870
errno = EINTR;
701
perror("incbuffer");
702
retval = -1;
871
703
goto mandos_end;
872
704
}
873
705
882
714
case GNUTLS_E_AGAIN:
883
715
break;
884
716
case GNUTLS_E_REHANDSHAKE:
885
do {
717
do{
886
718
ret = gnutls_handshake(session);
887
888
if(quit_now){
889
errno = EINTR;
890
goto mandos_end;
891
}
892
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
893
720
if(ret < 0){
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
896
722
gnutls_perror(ret);
897
errno = EPROTO;
723
retval = -1;
898
724
goto mandos_end;
899
725
}
900
726
break;
901
727
default:
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
728
fprintf(stderr, "Unknown error while reading data from"
729
" encrypted session with Mandos server\n");
730
retval = -1;
904
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
905
errno = EIO;
906
732
goto mandos_end;
907
733
}
908
734
} else {
911
737
}
912
738
913
739
if(debug){
914
fprintf_plus(stderr, "Closing TLS session\n");
915
}
916
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
do {
923
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
929
744
930
745
if(buffer_length > 0){
931
ssize_t decrypted_buffer_size;
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
933
748
&decrypted_buffer);
934
749
if(decrypted_buffer_size >= 0){
935
936
750
written = 0;
937
751
while(written < (size_t) decrypted_buffer_size){
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
752
ret = (int)fwrite(decrypted_buffer + written, 1,
944
753
(size_t)decrypted_buffer_size - written,
945
754
stdout);
946
755
if(ret == 0 and ferror(stdout)){
947
int e = errno;
948
756
if(debug){
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
757
fprintf(stderr, "Error writing encrypted data: %s\n",
758
strerror(errno));
951
759
}
952
errno = e;
953
goto mandos_end;
760
retval = -1;
761
break;
954
762
}
955
763
written += (size_t)ret;
956
764
}
957
retval = 0;
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
958
768
}
769
} else {
770
retval = -1;
959
771
}
960
772
961
773
/* Shutdown procedure */
962
774
963
775
mandos_end:
964
{
965
int e = errno;
966
free(decrypted_buffer);
967
free(buffer);
968
if(tcp_sd >= 0){
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
970
}
971
if(ret == -1){
972
if(e == 0){
973
e = errno;
974
}
975
perror_plus("close");
976
}
977
gnutls_deinit(session);
978
errno = e;
979
if(quit_now){
980
errno = EINTR;
981
retval = -1;
982
}
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
983
780
}
781
gnutls_deinit(session);
984
782
return retval;
985
783
}
986
784
1003
801
/* Called whenever a service has been resolved successfully or
1004
802
timed out */
1005
803
1006
if(quit_now){
1007
return;
1008
}
1009
1010
804
switch(event){
1011
805
default:
1012
806
case AVAHI_RESOLVER_FAILURE:
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
avahi_strerror(avahi_server_errno(mc.server)));
1017
810
break;
1018
811
1019
812
case AVAHI_RESOLVER_FOUND:
1021
814
char ip[AVAHI_ADDRESS_STR_MAX];
1022
815
avahi_address_snprint(ip, sizeof(ip), address);
1023
816
if(debug){
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
1027
820
}
1028
821
int ret = start_mandos_communication(ip, port, interface,
1029
822
avahi_proto_to_af(proto));
1030
823
if(ret == 0){
1031
824
avahi_simple_poll_quit(mc.simple_poll);
1032
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1035
825
}
1036
826
}
1037
827
}
1053
843
/* Called whenever a new services becomes available on the LAN or
1054
844
is removed from the LAN */
1055
845
1056
if(quit_now){
1057
return;
1058
}
1059
1060
846
switch(event){
1061
847
default:
1062
848
case AVAHI_BROWSER_FAILURE:
1063
849
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
850
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
1066
852
avahi_simple_poll_quit(mc.simple_poll);
1067
853
return;
1068
854
1075
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
862
name, type, domain, protocol, 0,
1077
863
resolve_callback, NULL) == NULL)
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
name, avahi_strerror(avahi_server_errno(mc.server)));
1081
866
break;
1082
867
1083
868
case AVAHI_BROWSER_REMOVE:
1086
871
case AVAHI_BROWSER_ALL_FOR_NOW:
1087
872
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1088
873
if(debug){
1089
fprintf_plus(stderr, "No Mandos server found, still"
1090
" searching...\n");
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1091
875
}
1092
876
break;
1093
877
}
1094
878
}
1095
879
1096
/* Signal handler that stops main loop after SIGTERM */
1097
static void handle_sigterm(int sig){
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1098
884
if(quit_now){
1099
885
return;
1100
886
}
1101
887
quit_now = 1;
1102
signal_received = sig;
1103
888
int old_errno = errno;
1104
/* set main loop to exit */
1105
889
if(mc.simple_poll != NULL){
1106
890
avahi_simple_poll_quit(mc.simple_poll);
1107
891
}
1108
892
errno = old_errno;
1109
893
}
1110
894
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
int ret;
1113
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
if(s < 0){
1116
perror_plus("socket");
1117
return false;
1118
}
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
if(ret == -1){
1122
if(debug){
1123
perror_plus("ioctl SIOCGIFFLAGS");
1124
}
1125
return false;
1126
}
1127
return true;
1128
}
1129
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1132
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1134
if(debug){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1136
ifname);
1137
}
1138
return false;
1139
}
1140
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1142
if(debug){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1145
}
1146
return true;
1147
}
1148
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1150
if(debug){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1153
}
1154
return false;
1155
}
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1158
if(debug){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1160
ifname);
1161
}
1162
return false;
1163
}
1164
1165
/* Accept this device */
1166
if(debug){
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1168
}
1169
return true;
1170
}
1171
1172
/*
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1176
*/
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1179
return 0;
1180
}
1181
1182
struct ifreq ifr;
1183
if(not get_flags(if_entry->d_name, &ifr)){
1184
if(debug){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1187
}
1188
return 0;
1189
}
1190
1191
if(not good_flags(if_entry->d_name, &ifr)){
1192
return 0;
1193
}
1194
return 1;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1253
int ret;
1254
size_t sret;
1255
struct stat st;
1256
1257
if((direntry->d_name)[0] == '\0'){
1258
/* Empty name? */
1259
return 0;
1260
}
1261
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1264
"0123456789"
1265
"_-");
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1268
if(debug){
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1270
direntry->d_name);
1271
}
1272
return 0;
1273
}
1274
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1283
if(ret == -1){
1284
if(debug){
1285
perror_plus("Could not stat hook");
1286
}
1287
return 0;
1288
}
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1291
if(debug){
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1293
direntry->d_name);
1294
}
1295
return 0;
1296
}
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1299
if(debug){
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1301
direntry->d_name);
1302
}
1303
return 0;
1304
}
1305
if(debug){
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1307
direntry->d_name);
1308
}
1309
return 1;
1310
}
1311
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1313
int ret;
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1317
1318
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1321
fprintf_plus(stderr, "Wait until first server is found."
1322
" No timeout!\n");
1323
}
1324
ret = avahi_simple_poll_iterate(s, -1);
1325
} else {
1326
if (debug){
1327
fprintf_plus(stderr, "Check current_server if we should run"
1328
" it, or wait\n");
1329
}
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1332
if(ret == -1){
1333
perror_plus("clock_gettime");
1334
return -1;
1335
}
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1349
if (debug){
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
block_time);
1352
}
1353
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1359
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1361
return 0;
1362
}
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1365
if(ret == -1){
1366
perror_plus("clock_gettime");
1367
return -1;
1368
}
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1372
}
1373
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
}
1376
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1379
}
1380
}
1381
}
1382
}
1383
1384
bool run_network_hooks(const char *mode, const char *interface,
1385
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1391
if(numhooks == -1){
1392
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1400
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1437
close(devnull);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1439
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1440
if(ret == -1){
1441
perror_plus("setenv");
1442
_exit(EX_OSERR);
1443
}
1444
ret = setenv("DEVICE", interface, 1);
1445
if(ret == -1){
1446
perror_plus("setenv");
1447
_exit(EX_OSERR);
1448
}
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1450
if(ret == -1){
1451
perror_plus("setenv");
1452
_exit(EX_OSERR);
1453
}
1454
ret = setenv("MODE", mode, 1);
1455
if(ret == -1){
1456
perror_plus("setenv");
1457
_exit(EX_OSERR);
1458
}
1459
char *delaystring;
1460
ret = asprintf(&delaystring, "%f", delay);
1461
if(ret == -1){
1462
perror_plus("asprintf");
1463
_exit(EX_OSERR);
1464
}
1465
ret = setenv("DELAY", delaystring, 1);
1466
if(ret == -1){
1467
free(delaystring);
1468
perror_plus("setenv");
1469
_exit(EX_OSERR);
1470
}
1471
free(delaystring);
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1474
} else {
1475
int status;
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1477
perror_plus("waitpid");
1478
free(fullname);
1479
continue;
1480
}
1481
if(WIFEXITED(status)){
1482
if(WEXITSTATUS(status) != 0){
1483
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1486
free(fullname);
1487
continue;
1488
}
1489
} else if(WIFSIGNALED(status)){
1490
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1491
" signal %d\n", direntry->d_name,
1492
WTERMSIG(status));
1493
free(fullname);
1494
continue;
1495
} else {
1496
fprintf_plus(stderr, "Warning: network hook \"%s\""
1497
" crashed\n", direntry->d_name);
1498
free(fullname);
1499
continue;
1500
}
1501
}
1502
free(fullname);
1503
if(debug){
1504
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1505
direntry->d_name);
1506
}
1507
}
1508
close(devnull);
1509
}
1510
return true;
1511
}
1512
1513
895
int main(int argc, char *argv[]){
1514
896
AvahiSServiceBrowser *sb = NULL;
1515
897
int error;
1517
899
intmax_t tmpmax;
1518
900
char *tmp;
1519
901
int exitcode = EXIT_SUCCESS;
1520
const char *interface = "";
902
const char *interface = "eth0";
1521
903
struct ifreq network;
1522
int sd = -1;
1523
bool take_down_interface = false;
904
int sd;
1524
905
uid_t uid;
1525
906
gid_t gid;
907
char *connect_to = NULL;
1526
908
char tempdir[] = "/tmp/mandosXXXXXX";
1527
909
bool tempdir_created = false;
1528
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1532
914
bool gnutls_initialized = false;
1533
915
bool gpgme_initialized = false;
1534
916
float delay = 2.5f;
1535
double retry_interval = 10; /* 10s between trying a server and
1536
retrying the same server again */
1537
917
1538
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
918
struct sigaction old_sigterm_action;
1539
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1540
920
1541
uid = getuid();
1542
gid = getgid();
1543
1544
/* Lower any group privileges we might have, just to be safe */
1545
errno = 0;
1546
ret = setgid(gid);
1547
if(ret == -1){
1548
perror_plus("setgid");
1549
}
1550
1551
/* Lower user privileges (temporarily) */
1552
errno = 0;
1553
ret = seteuid(uid);
1554
if(ret == -1){
1555
perror_plus("seteuid");
1556
}
1557
1558
if(quit_now){
1559
goto end;
1560
}
1561
1562
921
{
1563
922
struct argp_option options[] = {
1564
923
{ .name = "debug", .key = 128,
1593
952
.arg = "SECONDS",
1594
953
.doc = "Maximum delay to wait for interface startup",
1595
954
.group = 2 },
1596
{ .name = "retry", .key = 132,
1597
.arg = "SECONDS",
1598
.doc = "Retry interval used when denied by the mandos server",
1599
.group = 2 },
1600
{ .name = "network-hook-dir", .key = 133,
1601
.arg = "DIR",
1602
.doc = "Directory where network hooks are located",
1603
.group = 2 },
1604
/*
1605
* These reproduce what we would get without ARGP_NO_HELP
1606
*/
1607
{ .name = "help", .key = '?',
1608
.doc = "Give this help list", .group = -1 },
1609
{ .name = "usage", .key = -3,
1610
.doc = "Give a short usage message", .group = -1 },
1611
{ .name = "version", .key = 'V',
1612
.doc = "Print program version", .group = -1 },
1613
955
{ .name = NULL }
1614
956
};
1615
957
1616
958
error_t parse_opt(int key, char *arg,
1617
959
struct argp_state *state){
1618
errno = 0;
1619
960
switch(key){
1620
961
case 128: /* --debug */
1621
962
debug = true;
1637
978
tmpmax = strtoimax(arg, &tmp, 10);
1638
979
if(errno != 0 or tmp == arg or *tmp != '\0'
1639
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1640
argp_error(state, "Bad number of DH bits");
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1641
983
}
1642
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1643
985
break;
1648
990
errno = 0;
1649
991
delay = strtof(arg, &tmp);
1650
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
1651
argp_error(state, "Bad delay");
1652
}
1653
case 132: /* --retry */
1654
errno = 0;
1655
retry_interval = strtod(arg, &tmp);
1656
if(errno != 0 or tmp == arg or *tmp != '\0'
1657
or (retry_interval * 1000) > INT_MAX
1658
or retry_interval < 0){
1659
argp_error(state, "Bad retry interval");
1660
}
1661
break;
1662
case 133: /* --network-hook-dir */
1663
hookdir = arg;
1664
break;
1665
/*
1666
* These reproduce what we would get without ARGP_NO_HELP
1667
*/
1668
case '?': /* --help */
1669
argp_state_help(state, state->out_stream,
1670
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1671
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1672
case -3: /* --usage */
1673
argp_state_help(state, state->out_stream,
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1675
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1679
exit(argp_err_exit_status);
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1680
1000
break;
1681
1001
default:
1682
1002
return ARGP_ERR_UNKNOWN;
1683
1003
}
1684
return errno;
1004
return 0;
1685
1005
}
1686
1006
1687
1007
struct argp argp = { .options = options, .parser = parse_opt,
1688
1008
.args_doc = "",
1689
1009
.doc = "Mandos client -- Get and decrypt"
1690
1010
" passwords from a Mandos server" };
1691
ret = argp_parse(&argp, argc, argv,
1692
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1693
switch(ret){
1694
case 0:
1695
break;
1696
case ENOMEM:
1697
default:
1698
errno = ret;
1699
perror_plus("argp_parse");
1700
exitcode = EX_OSERR;
1701
goto end;
1702
case EINVAL:
1703
exitcode = EX_USAGE;
1704
goto end;
1705
}
1706
}
1707
1708
{
1709
/* Work around Debian bug #633582:
1710
<http://bugs.debian.org/633582> */
1711
1712
/* Re-raise priviliges */
1713
errno = 0;
1714
ret = seteuid(0);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
} else {
1718
struct stat st;
1719
1720
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1721
int seckey_fd = open(seckey, O_RDONLY);
1722
if(seckey_fd == -1){
1723
perror_plus("open");
1724
} else {
1725
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1726
if(ret == -1){
1727
perror_plus("fstat");
1728
} else {
1729
if(S_ISREG(st.st_mode)
1730
and st.st_uid == 0 and st.st_gid == 0){
1731
ret = fchown(seckey_fd, uid, gid);
1732
if(ret == -1){
1733
perror_plus("fchown");
1734
}
1735
}
1736
}
1737
TEMP_FAILURE_RETRY(close(seckey_fd));
1738
}
1739
}
1740
1741
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1742
int pubkey_fd = open(pubkey, O_RDONLY);
1743
if(pubkey_fd == -1){
1744
perror_plus("open");
1745
} else {
1746
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1747
if(ret == -1){
1748
perror_plus("fstat");
1749
} else {
1750
if(S_ISREG(st.st_mode)
1751
and st.st_uid == 0 and st.st_gid == 0){
1752
ret = fchown(pubkey_fd, uid, gid);
1753
if(ret == -1){
1754
perror_plus("fchown");
1755
}
1756
}
1757
}
1758
TEMP_FAILURE_RETRY(close(pubkey_fd));
1759
}
1760
}
1761
1762
/* Lower privileges */
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
1767
}
1768
}
1769
}
1770
1771
/* Run network hooks */
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
1774
1017
}
1775
1018
1776
1019
if(not debug){
1777
1020
avahi_set_log_function(empty_log);
1778
1021
}
1779
1022
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1784
alphasort);
1785
if(ret == 0){
1786
/* No up interfaces, look for any good interfaces */
1787
free(direntries);
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1789
alphasort);
1790
}
1791
if(ret >= 1){
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1794
if(debug){
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1796
}
1797
if(interface == NULL){
1798
perror_plus("malloc");
1799
free(direntries);
1800
exitcode = EXIT_FAILURE;
1801
goto end;
1802
}
1803
free(direntries);
1804
} else {
1805
free(direntries);
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
1812
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
1024
from the signal handler */
1814
1025
/* Initialize the pseudo-RNG for Avahi */
1815
1026
srand((unsigned int) time(NULL));
1816
1027
mc.simple_poll = avahi_simple_poll_new();
1817
1028
if(mc.simple_poll == NULL){
1818
fprintf_plus(stderr,
1819
"Avahi: Failed to create simple poll object.\n");
1820
exitcode = EX_UNAVAILABLE;
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1821
1031
goto end;
1822
1032
}
1823
1033
1824
1034
sigemptyset(&sigterm_action.sa_mask);
1825
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1826
1036
if(ret == -1){
1827
perror_plus("sigaddset");
1828
exitcode = EX_OSERR;
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1829
1039
goto end;
1830
1040
}
1831
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1832
1042
if(ret == -1){
1833
perror_plus("sigaddset");
1834
exitcode = EX_OSERR;
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1835
1045
goto end;
1836
1046
}
1837
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1838
1048
if(ret == -1){
1839
perror_plus("sigaddset");
1840
exitcode = EX_OSERR;
1841
goto end;
1842
}
1843
/* Need to check if the handler is SIG_IGN before handling:
1844
| [[info:libc:Initial Signal Actions]] |
1845
| [[info:libc:Basic Signal Handling]] |
1846
*/
1847
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
return EX_OSERR;
1851
}
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGINT, &sigterm_action, NULL);
1854
if(ret == -1){
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1857
goto end;
1858
}
1859
}
1860
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
return EX_OSERR;
1864
}
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1867
if(ret == -1){
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
}
1872
}
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1874
if(ret == -1){
1875
perror_plus("sigaction");
1876
return EX_OSERR;
1877
}
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1880
if(ret == -1){
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1883
goto end;
1884
}
1885
}
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1886
1059
1887
1060
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1893
goto end;
1894
}
1895
1896
if(quit_now){
1897
goto end;
1898
}
1899
1900
/* Re-raise priviliges */
1901
errno = 0;
1902
ret = seteuid(0);
1903
if(ret == -1){
1904
perror_plus("seteuid");
1905
}
1906
1061
if(interface[0] != '\0'){
1907
1062
#ifdef __linux__
1908
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1909
messages about the network interface to mess up the prompt */
1064
messages to mess up the prompt */
1910
1065
ret = klogctl(8, NULL, 5);
1911
1066
bool restore_loglevel = true;
1912
1067
if(ret == -1){
1913
1068
restore_loglevel = false;
1914
perror_plus("klogctl");
1069
perror("klogctl");
1915
1070
}
1916
1071
#endif /* __linux__ */
1917
1072
1918
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1919
1074
if(sd < 0){
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1922
1077
#ifdef __linux__
1923
1078
if(restore_loglevel){
1924
1079
ret = klogctl(7, NULL, 0);
1925
1080
if(ret == -1){
1926
perror_plus("klogctl");
1081
perror("klogctl");
1927
1082
}
1928
1083
}
1929
1084
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
ret = seteuid(uid);
1933
if(ret == -1){
1934
perror_plus("seteuid");
1935
}
1936
1085
goto end;
1937
1086
}
1938
1087
strcpy(network.ifr_name, interface);
1939
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1940
1089
if(ret == -1){
1941
perror_plus("ioctl SIOCGIFFLAGS");
1090
perror("ioctl SIOCGIFFLAGS");
1942
1091
#ifdef __linux__
1943
1092
if(restore_loglevel){
1944
1093
ret = klogctl(7, NULL, 0);
1945
1094
if(ret == -1){
1946
perror_plus("klogctl");
1095
perror("klogctl");
1947
1096
}
1948
1097
}
1949
1098
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1952
errno = 0;
1953
ret = seteuid(uid);
1954
if(ret == -1){
1955
perror_plus("seteuid");
1956
}
1099
exitcode = EXIT_FAILURE;
1957
1100
goto end;
1958
1101
}
1959
1102
if((network.ifr_flags & IFF_UP) == 0){
1960
1103
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
1962
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1963
1105
if(ret == -1){
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1967
1108
#ifdef __linux__
1968
1109
if(restore_loglevel){
1969
1110
ret = klogctl(7, NULL, 0);
1970
1111
if(ret == -1){
1971
perror_plus("klogctl");
1112
perror("klogctl");
1972
1113
}
1973
1114
}
1974
1115
#endif /* __linux__ */
1975
/* Lower privileges */
1976
errno = 0;
1977
ret = seteuid(uid);
1978
if(ret == -1){
1979
perror_plus("seteuid");
1980
}
1981
1116
goto end;
1982
1117
}
1983
1118
}
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
1119
/* sleep checking until interface is running */
1986
1120
for(int i=0; i < delay * 4; i++){
1987
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1988
1122
if(ret == -1){
1989
perror_plus("ioctl SIOCGIFFLAGS");
1123
perror("ioctl SIOCGIFFLAGS");
1990
1124
} else if(network.ifr_flags & IFF_RUNNING){
1991
1125
break;
1992
1126
}
1993
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1994
1128
ret = nanosleep(&sleeptime, NULL);
1995
1129
if(ret == -1 and errno != EINTR){
1996
perror_plus("nanosleep");
1130
perror("nanosleep");
1997
1131
}
1998
1132
}
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2002
if(ret == -1){
2003
perror_plus("close");
2004
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
2005
1136
}
2006
1137
#ifdef __linux__
2007
1138
if(restore_loglevel){
2008
1139
/* Restores kernel loglevel to default */
2009
1140
ret = klogctl(7, NULL, 0);
2010
1141
if(ret == -1){
2011
perror_plus("klogctl");
1142
perror("klogctl");
2012
1143
}
2013
1144
}
2014
1145
#endif /* __linux__ */
2015
/* Lower privileges */
2016
errno = 0;
2017
/* Lower privileges */
2018
ret = seteuid(uid);
2019
if(ret == -1){
2020
perror_plus("seteuid");
2021
}
2022
}
2023
2024
if(quit_now){
2025
goto end;
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
2026
1160
}
2027
1161
2028
1162
ret = init_gnutls_global(pubkey, seckey);
2029
1163
if(ret == -1){
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
2031
exitcode = EX_UNAVAILABLE;
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2032
1166
goto end;
2033
1167
} else {
2034
1168
gnutls_initialized = true;
2035
1169
}
2036
1170
2037
if(quit_now){
2038
goto end;
2039
}
2040
2041
1171
if(mkdtemp(tempdir) == NULL){
2042
perror_plus("mkdtemp");
1172
perror("mkdtemp");
2043
1173
goto end;
2044
1174
}
2045
1175
tempdir_created = true;
2046
1176
2047
if(quit_now){
2048
goto end;
2049
}
2050
2051
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
2052
fprintf_plus(stderr, "init_gpgme failed\n");
2053
exitcode = EX_UNAVAILABLE;
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2054
1180
goto end;
2055
1181
} else {
2056
1182
gpgme_initialized = true;
2057
1183
}
2058
1184
2059
if(quit_now){
2060
goto end;
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
2061
1192
}
2062
1193
2063
1194
if(connect_to != NULL){
2065
1196
/* (Mainly meant for debugging) */
2066
1197
char *address = strrchr(connect_to, ':');
2067
1198
if(address == NULL){
2068
fprintf_plus(stderr, "No colon in address\n");
2069
exitcode = EX_USAGE;
2070
goto end;
2071
}
2072
2073
if(quit_now){
2074
goto end;
2075
}
2076
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
2077
1203
uint16_t port;
2078
1204
errno = 0;
2079
1205
tmpmax = strtoimax(address+1, &tmp, 10);
2080
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2081
1207
or tmpmax != (uint16_t)tmpmax){
2082
fprintf_plus(stderr, "Bad port number\n");
2083
exitcode = EX_USAGE;
2084
goto end;
2085
}
2086
2087
if(quit_now){
2088
goto end;
2089
}
2090
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
2091
1212
port = (uint16_t)tmpmax;
2092
1213
*address = '\0';
1214
address = connect_to;
2093
1215
/* Colon in address indicates IPv6 */
2094
1216
int af;
2095
if(strchr(connect_to, ':') != NULL){
1217
if(strchr(address, ':') != NULL){
2096
1218
af = AF_INET6;
2097
/* Accept [] around IPv6 address - see RFC 5952 */
2098
if(connect_to[0] == '[' and address[-1] == ']')
2099
{
2100
connect_to++;
2101
address[-1] = '\0';
2102
}
2103
1219
} else {
2104
1220
af = AF_INET;
2105
1221
}
2106
address = connect_to;
2107
2108
if(quit_now){
2109
goto end;
2110
}
2111
2112
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2114
if(quit_now or ret == 0){
2115
break;
2116
}
2117
if(debug){
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2119
(int)retry_interval);
2120
}
2121
sleep((int)retry_interval);
2122
}
2123
2124
if (not quit_now){
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2125
1226
exitcode = EXIT_SUCCESS;
2126
1227
}
1228
goto end;
1229
}
2127
1230
2128
goto end;
2129
}
2130
2131
if(quit_now){
2132
goto end;
2133
}
2134
2135
1231
{
2136
1232
AvahiServerConfig config;
2137
1233
/* Do not publish any local Zeroconf records */
2152
1248
2153
1249
/* Check if creating the Avahi server object succeeded */
2154
1250
if(mc.server == NULL){
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2156
avahi_strerror(error));
2157
exitcode = EX_UNAVAILABLE;
2158
goto end;
2159
}
2160
2161
if(quit_now){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
2162
1254
goto end;
2163
1255
}
2164
1256
2167
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2168
1260
NULL, 0, browse_callback, NULL);
2169
1261
if(sb == NULL){
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2171
avahi_strerror(avahi_server_errno(mc.server)));
2172
exitcode = EX_UNAVAILABLE;
2173
goto end;
2174
}
2175
2176
if(quit_now){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
2177
1265
goto end;
2178
1266
}
2179
1267
2180
1268
/* Run the main loop */
2181
1269
2182
1270
if(debug){
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
2184
}
2185
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2188
if(debug){
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2190
(ret == 0) ? "successfully" : "with error");
2191
}
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
2192
1275
2193
1276
end:
2194
1277
2195
1278
if(debug){
2196
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2197
1280
}
2198
1281
2199
1282
/* Cleanup things */
2216
1299
gpgme_release(mc.ctx);
2217
1300
}
2218
1301
2219
/* Cleans up the circular linked list of Mandos servers the client
2220
has seen */
2221
if(mc.current_server != NULL){
2222
mc.current_server->prev->next = NULL;
2223
while(mc.current_server != NULL){
2224
server *next = mc.current_server->next;
2225
free(mc.current_server);
2226
mc.current_server = next;
2227
}
2228
}
2229
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Re-raise priviliges */
2234
{
2235
errno = 0;
2236
ret = seteuid(0);
2237
if(ret == -1){
2238
perror_plus("seteuid");
2239
}
2240
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2244
if(ret == -1){
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2249
if(ret == -1){
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2251
}
2252
}
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2254
if(ret == -1){
2255
perror_plus("close");
2256
}
2257
}
2258
}
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
2265
2266
/* Removes the GPGME temp directory and all files inside */
1302
/* Removes the temp directory used by GPGME */
2267
1303
if(tempdir_created){
2268
struct dirent **direntries = NULL;
2269
struct dirent *direntry = NULL;
2270
int numentries = scandir(tempdir, &direntries, notdotentries,
2271
alphasort);
2272
if (numentries > 0){
2273
for(int i = 0; i < numentries; i++){
2274
direntry = direntries[i];
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
2275
1324
char *fullname = NULL;
2276
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
2277
1326
direntry->d_name);
2278
1327
if(ret < 0){
2279
perror_plus("asprintf");
1328
perror("asprintf");
2280
1329
continue;
2281
1330
}
2282
1331
ret = remove(fullname);
2283
1332
if(ret == -1){
2284
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2285
strerror(errno));
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
2286
1335
}
2287
1336
free(fullname);
2288
1337
}
2289
}
2290
2291
/* need to clean even if 0 because man page doesn't specify */
2292
free(direntries);
2293
if (numentries == -1){
2294
perror_plus("scandir");
1338
closedir(d);
2295
1339
}
2296
1340
ret = rmdir(tempdir);
2297
1341
if(ret == -1 and errno != ENOENT){
2298
perror_plus("rmdir");
2299
}
2300
}
2301
2302
if(quit_now){
2303
sigemptyset(&old_sigterm_action.sa_mask);
2304
old_sigterm_action.sa_handler = SIG_DFL;
2305
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2306
&old_sigterm_action,
2307
NULL));
2308
if(ret == -1){
2309
perror_plus("sigaction");
2310
}
2311
do {
2312
ret = raise(signal_received);
2313
} while(ret != 0 and errno == EINTR);
2314
if(ret != 0){
2315
perror_plus("raise");
2316
abort();
2317
}
2318
TEMP_FAILURE_RETRY(pause());
1342
perror("rmdir");
1343
}
2319
1344
}
2320
1345
2321
1346
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0