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237.2.133
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-09-17 01:21:27 UTC
- mto: (24.1.142 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090917012127-4kwzquwuvudwucuv
* debian/control (Standards-Version): Updated to "2.8.3".
* mandos-client.conf.xml (OPTIONS/timeout): Add that a successful
client request will also
reset the timeout.
* mandos.xml (CHECKING): - '' -
* mandos-client.conf.xml (OPTIONS/timeout): Add that a successful
client request will also
reset the timeout.
* mandos.xml (CHECKING): - '' -
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
85
92
86
#ifdef __linux__
93
87
#include <sys/klog.h> /* klogctl() */
111
105
init_gnutls_session(),
112
106
GNUTLS_* */
113
107
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
116
110
117
111
/* GPGME */
118
112
#include <gpgme.h> /* All GPGME types, constants and
126
120
#define PATHDIR "/conf/conf.d/mandos"
127
121
#define SECKEY "seckey.txt"
128
122
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
123
131
124
bool debug = false;
132
125
static const char mandos_protocol_version[] = "1";
133
126
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
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
int e = errno;
174
fprintf(stderr, "Mandos plugin %s: ",
175
program_invocation_short_name);
176
errno = e;
177
perror(print_text);
178
}
179
180
__attribute__((format (gnu_printf, 2, 3)))
181
int fprintf_plus(FILE *stream, const char *format, ...){
182
va_list ap;
183
va_start (ap, format);
184
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
189
144
190
145
/*
191
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
193
148
* "buffer_length" is how much is already used.
194
149
*/
195
150
size_t incbuffer(char **buffer, size_t buffer_length,
196
size_t buffer_capacity){
151
size_t buffer_capacity){
197
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
154
if(buffer == NULL){
204
159
return buffer_capacity;
205
160
}
206
161
207
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
210
int ret;
211
server *new_server = malloc(sizeof(server));
212
if(new_server == NULL){
213
perror_plus("malloc");
214
return false;
215
}
216
*new_server = (server){ .ip = strdup(ip),
217
.port = port,
218
.if_index = if_index,
219
.af = af };
220
if(new_server->ip == NULL){
221
perror_plus("strdup");
222
return false;
223
}
224
/* Special case of first server */
225
if (mc.current_server == NULL){
226
new_server->next = new_server;
227
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
230
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
233
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
240
}
241
return true;
242
}
243
244
162
/*
245
163
* Initialize GPGME.
246
164
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
249
167
gpgme_error_t rc;
250
168
gpgme_engine_info_t engine_info;
251
169
260
178
261
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
262
180
if(fd == -1){
263
perror_plus("open");
181
perror("open");
264
182
return false;
265
183
}
266
184
267
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
186
if(rc != GPG_ERR_NO_ERROR){
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
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));
271
189
return false;
272
190
}
273
191
274
192
rc = gpgme_op_import(mc.ctx, pgp_data);
275
193
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
278
196
return false;
279
197
}
280
198
281
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
282
200
if(ret == -1){
283
perror_plus("close");
201
perror("close");
284
202
}
285
203
gpgme_data_release(pgp_data);
286
204
return true;
287
205
}
288
206
289
207
if(debug){
290
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
291
209
}
292
210
293
211
/* Init GPGME */
294
212
gpgme_check_version(NULL);
295
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
296
214
if(rc != GPG_ERR_NO_ERROR){
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
299
217
return false;
300
218
}
301
219
302
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
303
221
rc = gpgme_get_engine_info(&engine_info);
304
222
if(rc != GPG_ERR_NO_ERROR){
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
307
225
return false;
308
226
}
309
227
while(engine_info != NULL){
315
233
engine_info = engine_info->next;
316
234
}
317
235
if(engine_info == NULL){
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
237
return false;
321
238
}
322
239
323
240
/* Create new GPGME "context" */
324
241
rc = gpgme_new(&(mc.ctx));
325
242
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
329
245
return false;
330
246
}
331
247
350
266
ssize_t plaintext_length = 0;
351
267
352
268
if(debug){
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
354
270
}
355
271
356
272
/* Create new GPGME data buffer from memory cryptotext */
357
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
358
274
0);
359
275
if(rc != GPG_ERR_NO_ERROR){
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
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));
362
278
return -1;
363
279
}
364
280
365
281
/* Create new empty GPGME data buffer for the plaintext */
366
282
rc = gpgme_data_new(&dh_plain);
367
283
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
371
286
gpgme_data_release(dh_crypto);
372
287
return -1;
373
288
}
376
291
data buffer */
377
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
293
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
381
296
plaintext_length = -1;
382
297
if(debug){
383
298
gpgme_decrypt_result_t result;
384
299
result = gpgme_op_decrypt_result(mc.ctx);
385
300
if(result == NULL){
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
387
302
} else {
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
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);
392
307
if(result->file_name != NULL){
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
394
309
}
395
310
gpgme_recipient_t recipient;
396
311
recipient = result->recipients;
397
312
while(recipient != NULL){
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
405
319
recipient = recipient->next;
406
320
}
407
321
}
410
324
}
411
325
412
326
if(debug){
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
328
}
415
329
416
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
417
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
418
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
419
333
plaintext_length = -1;
420
334
goto decrypt_end;
421
335
}
423
337
*plaintext = NULL;
424
338
while(true){
425
339
plaintext_capacity = incbuffer(plaintext,
426
(size_t)plaintext_length,
427
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
428
342
if(plaintext_capacity == 0){
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
432
346
}
433
347
434
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
439
353
break;
440
354
}
441
355
if(ret < 0){
442
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
443
357
plaintext_length = -1;
444
358
goto decrypt_end;
445
359
}
447
361
}
448
362
449
363
if(debug){
450
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
451
365
for(ssize_t i = 0; i < plaintext_length; i++){
452
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
453
367
}
475
389
/* GnuTLS log function callback */
476
390
static void debuggnutls(__attribute__((unused)) int level,
477
391
const char* string){
478
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
479
393
}
480
394
481
395
static int init_gnutls_global(const char *pubkeyfilename,
483
397
int ret;
484
398
485
399
if(debug){
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
487
401
}
488
402
489
403
ret = gnutls_global_init();
490
404
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
493
407
return -1;
494
408
}
495
409
502
416
}
503
417
504
418
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
506
420
if(ret != GNUTLS_E_SUCCESS){
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
509
426
gnutls_global_deinit();
510
427
return -1;
511
428
}
512
429
513
430
if(debug){
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
518
434
}
519
435
520
436
ret = gnutls_certificate_set_openpgp_key_file
521
437
(mc.cred, pubkeyfilename, seckeyfilename,
522
438
GNUTLS_OPENPGP_FMT_BASE64);
523
439
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr,
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
529
445
goto globalfail;
530
446
}
531
447
532
448
/* GnuTLS server initialization */
533
449
ret = gnutls_dh_params_init(&mc.dh_params);
534
450
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
538
453
goto globalfail;
539
454
}
540
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
456
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
544
459
goto globalfail;
545
460
}
546
461
561
476
/* GnuTLS session creation */
562
477
do {
563
478
ret = gnutls_init(session, GNUTLS_SERVER);
564
if(quit_now){
565
return -1;
566
}
567
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
568
480
if(ret != GNUTLS_E_SUCCESS){
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
572
483
}
573
484
574
485
{
575
486
const char *err;
576
487
do {
577
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
578
if(quit_now){
579
gnutls_deinit(*session);
580
return -1;
581
}
582
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
583
490
if(ret != GNUTLS_E_SUCCESS){
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Syntax error at: %s\n", err);
492
fprintf(stderr, "GnuTLS error: %s\n",
493
safer_gnutls_strerror(ret));
587
494
gnutls_deinit(*session);
588
495
return -1;
589
496
}
592
499
do {
593
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
501
mc.cred);
595
if(quit_now){
596
gnutls_deinit(*session);
597
return -1;
598
}
599
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
600
503
if(ret != GNUTLS_E_SUCCESS){
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
safer_gnutls_strerror(ret));
603
506
gnutls_deinit(*session);
604
507
return -1;
605
508
}
616
519
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
520
__attribute__((unused)) const char *txt){}
618
521
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
619
525
/* Called when a Mandos server is found */
620
526
static int start_mandos_communication(const char *ip, uint16_t port,
621
527
AvahiIfIndex if_index,
627
533
struct sockaddr_in6 in6;
628
534
} to;
629
535
char *buffer = NULL;
630
char *decrypted_buffer = NULL;
536
char *decrypted_buffer;
631
537
size_t buffer_length = 0;
632
538
size_t buffer_capacity = 0;
633
539
size_t written;
634
int retval = -1;
540
int retval = 0;
635
541
gnutls_session_t session;
636
542
int pf; /* Protocol family */
637
543
638
errno = 0;
639
640
544
if(quit_now){
641
errno = EINTR;
642
545
return -1;
643
546
}
644
547
650
553
pf = PF_INET;
651
554
break;
652
555
default:
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
654
errno = EINVAL;
556
fprintf(stderr, "Bad address family: %d\n", af);
655
557
return -1;
656
558
}
657
559
661
563
}
662
564
663
565
if(debug){
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
567
"\n", ip, port);
666
568
}
667
569
668
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
669
571
if(tcp_sd < 0){
670
int e = errno;
671
perror_plus("socket");
672
errno = e;
572
perror("socket");
573
retval = -1;
673
574
goto mandos_end;
674
575
}
675
576
676
577
if(quit_now){
677
errno = EINTR;
678
578
goto mandos_end;
679
579
}
680
580
687
587
ret = inet_pton(af, ip, &to.in.sin_addr);
688
588
}
689
589
if(ret < 0 ){
690
int e = errno;
691
perror_plus("inet_pton");
692
errno = e;
590
perror("inet_pton");
591
retval = -1;
693
592
goto mandos_end;
694
593
}
695
594
if(ret == 0){
696
int e = errno;
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
698
errno = e;
595
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
699
597
goto mandos_end;
700
598
}
701
599
if(af == AF_INET6){
705
603
706
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
606
-Wunreachable-code*/
709
607
if(if_index == AVAHI_IF_UNSPEC){
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
712
errno = EINVAL;
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
713
611
goto mandos_end;
714
612
}
715
613
/* Set the network interface number as scope */
722
620
}
723
621
724
622
if(quit_now){
725
errno = EINTR;
726
623
goto mandos_end;
727
624
}
728
625
730
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
731
628
char interface[IF_NAMESIZE];
732
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
perror_plus("if_indextoname");
630
perror("if_indextoname");
734
631
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
737
634
}
738
635
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
741
638
}
742
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
750
647
sizeof(addrstr));
751
648
}
752
649
if(pcret == NULL){
753
perror_plus("inet_ntop");
650
perror("inet_ntop");
754
651
} else {
755
652
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
653
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
654
}
758
655
}
759
656
}
760
657
761
658
if(quit_now){
762
errno = EINTR;
763
659
goto mandos_end;
764
660
}
765
661
769
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
666
}
771
667
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
668
perror("connect");
669
retval = -1;
777
670
goto mandos_end;
778
671
}
779
672
780
673
if(quit_now){
781
errno = EINTR;
782
674
goto mandos_end;
783
675
}
784
676
787
679
while(true){
788
680
size_t out_size = strlen(out);
789
681
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
790
out_size - written));
682
out_size - written));
791
683
if(ret == -1){
792
int e = errno;
793
perror_plus("write");
794
errno = e;
684
perror("write");
685
retval = -1;
795
686
goto mandos_end;
796
687
}
797
688
written += (size_t)ret;
807
698
}
808
699
809
700
if(quit_now){
810
errno = EINTR;
811
701
goto mandos_end;
812
702
}
813
703
}
814
704
815
705
if(debug){
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
817
707
}
818
708
819
709
if(quit_now){
820
errno = EINTR;
821
710
goto mandos_end;
822
711
}
823
712
824
/* This casting via intptr_t is to eliminate warning about casting
825
an int to a pointer type. This is exactly how the GnuTLS Guile
826
function "set-session-transport-fd!" does it. */
827
gnutls_transport_set_ptr(session,
828
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
829
714
830
715
if(quit_now){
831
errno = EINTR;
832
716
goto mandos_end;
833
717
}
834
718
835
719
do {
836
720
ret = gnutls_handshake(session);
837
721
if(quit_now){
838
errno = EINTR;
839
722
goto mandos_end;
840
723
}
841
724
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
842
725
843
726
if(ret != GNUTLS_E_SUCCESS){
844
727
if(debug){
845
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
728
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
846
729
gnutls_perror(ret);
847
730
}
848
errno = EPROTO;
731
retval = -1;
849
732
goto mandos_end;
850
733
}
851
734
852
735
/* Read OpenPGP packet that contains the wanted password */
853
736
854
737
if(debug){
855
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
856
" %s\n", ip);
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
739
ip);
857
740
}
858
741
859
742
while(true){
860
743
861
744
if(quit_now){
862
errno = EINTR;
863
745
goto mandos_end;
864
746
}
865
747
866
748
buffer_capacity = incbuffer(&buffer, buffer_length,
867
buffer_capacity);
749
buffer_capacity);
868
750
if(buffer_capacity == 0){
869
int e = errno;
870
perror_plus("incbuffer");
871
errno = e;
751
perror("incbuffer");
752
retval = -1;
872
753
goto mandos_end;
873
754
}
874
755
875
756
if(quit_now){
876
errno = EINTR;
877
757
goto mandos_end;
878
758
}
879
759
892
772
ret = gnutls_handshake(session);
893
773
894
774
if(quit_now){
895
errno = EINTR;
896
775
goto mandos_end;
897
776
}
898
777
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
899
778
if(ret < 0){
900
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
901
"***\n");
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
902
780
gnutls_perror(ret);
903
errno = EPROTO;
781
retval = -1;
904
782
goto mandos_end;
905
783
}
906
784
break;
907
785
default:
908
fprintf_plus(stderr, "Unknown error while reading data from"
909
" encrypted session with Mandos server\n");
786
fprintf(stderr, "Unknown error while reading data from"
787
" encrypted session with Mandos server\n");
788
retval = -1;
910
789
gnutls_bye(session, GNUTLS_SHUT_RDWR);
911
errno = EIO;
912
790
goto mandos_end;
913
791
}
914
792
} else {
917
795
}
918
796
919
797
if(debug){
920
fprintf_plus(stderr, "Closing TLS session\n");
921
}
922
923
if(quit_now){
924
errno = EINTR;
925
goto mandos_end;
926
}
927
928
do {
929
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
930
if(quit_now){
931
errno = EINTR;
932
goto mandos_end;
933
}
934
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
798
fprintf(stderr, "Closing TLS session\n");
799
}
800
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
807
if(quit_now){
808
goto mandos_end;
809
}
935
810
936
811
if(buffer_length > 0){
937
812
ssize_t decrypted_buffer_size;
938
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
814
buffer_length,
939
815
&decrypted_buffer);
940
816
if(decrypted_buffer_size >= 0){
941
817
942
818
written = 0;
943
819
while(written < (size_t) decrypted_buffer_size){
944
820
if(quit_now){
945
errno = EINTR;
946
821
goto mandos_end;
947
822
}
948
823
950
825
(size_t)decrypted_buffer_size - written,
951
826
stdout);
952
827
if(ret == 0 and ferror(stdout)){
953
int e = errno;
954
828
if(debug){
955
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
956
strerror(errno));
829
fprintf(stderr, "Error writing encrypted data: %s\n",
830
strerror(errno));
957
831
}
958
errno = e;
959
goto mandos_end;
832
retval = -1;
833
break;
960
834
}
961
835
written += (size_t)ret;
962
836
}
963
retval = 0;
837
free(decrypted_buffer);
838
} else {
839
retval = -1;
964
840
}
841
} else {
842
retval = -1;
965
843
}
966
844
967
845
/* Shutdown procedure */
968
846
969
847
mandos_end:
970
{
971
int e = errno;
972
free(decrypted_buffer);
973
free(buffer);
974
if(tcp_sd >= 0){
975
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
976
}
977
if(ret == -1){
978
if(e == 0){
979
e = errno;
980
}
981
perror_plus("close");
982
}
983
gnutls_deinit(session);
984
errno = e;
985
if(quit_now){
986
errno = EINTR;
987
retval = -1;
988
}
848
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
989
858
}
990
859
return retval;
991
860
}
1016
885
switch(event){
1017
886
default:
1018
887
case AVAHI_RESOLVER_FAILURE:
1019
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1020
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1021
domain,
1022
avahi_strerror(avahi_server_errno(mc.server)));
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
1023
891
break;
1024
892
1025
893
case AVAHI_RESOLVER_FOUND:
1027
895
char ip[AVAHI_ADDRESS_STR_MAX];
1028
896
avahi_address_snprint(ip, sizeof(ip), address);
1029
897
if(debug){
1030
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1031
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
host_name, ip, (intmax_t)interface, port);
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
1033
901
}
1034
902
int ret = start_mandos_communication(ip, port, interface,
1035
903
avahi_proto_to_af(proto));
1036
904
if(ret == 0){
1037
905
avahi_simple_poll_quit(mc.simple_poll);
1038
} else {
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1041
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
" list\n", name);
1043
}
1044
906
}
1045
907
}
1046
908
}
1070
932
default:
1071
933
case AVAHI_BROWSER_FAILURE:
1072
934
1073
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
1075
937
avahi_simple_poll_quit(mc.simple_poll);
1076
938
return;
1077
939
1084
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
947
name, type, domain, protocol, 0,
1086
948
resolve_callback, NULL) == NULL)
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
1090
951
break;
1091
952
1092
953
case AVAHI_BROWSER_REMOVE:
1095
956
case AVAHI_BROWSER_ALL_FOR_NOW:
1096
957
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1097
958
if(debug){
1098
fprintf_plus(stderr, "No Mandos server found, still"
1099
" searching...\n");
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1100
960
}
1101
961
break;
1102
962
}
1103
963
}
1104
964
1105
/* Signal handler that stops main loop after SIGTERM */
965
/* stop main loop after sigterm has been called */
1106
966
static void handle_sigterm(int sig){
1107
967
if(quit_now){
1108
968
return;
1110
970
quit_now = 1;
1111
971
signal_received = sig;
1112
972
int old_errno = errno;
1113
/* set main loop to exit */
1114
973
if(mc.simple_poll != NULL){
1115
974
avahi_simple_poll_quit(mc.simple_poll);
1116
975
}
1117
976
errno = old_errno;
1118
977
}
1119
978
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
int ret;
1122
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
if(s < 0){
1125
perror_plus("socket");
1126
return false;
1127
}
1128
strcpy(ifr->ifr_name, ifname);
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
if(ret == -1){
1131
if(debug){
1132
perror_plus("ioctl SIOCGIFFLAGS");
1133
}
1134
return false;
1135
}
1136
return true;
1137
}
1138
1139
bool good_flags(const char *ifname, const struct ifreq *ifr){
1140
1141
/* Reject the loopback device */
1142
if(ifr->ifr_flags & IFF_LOOPBACK){
1143
if(debug){
1144
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1145
ifname);
1146
}
1147
return false;
1148
}
1149
/* Accept point-to-point devices only if connect_to is specified */
1150
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1151
if(debug){
1152
fprintf_plus(stderr, "Accepting point-to-point interface"
1153
" \"%s\"\n", ifname);
1154
}
1155
return true;
1156
}
1157
/* Otherwise, reject non-broadcast-capable devices */
1158
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1159
if(debug){
1160
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1161
" \"%s\"\n", ifname);
1162
}
1163
return false;
1164
}
1165
/* Reject non-ARP interfaces (including dummy interfaces) */
1166
if(ifr->ifr_flags & IFF_NOARP){
1167
if(debug){
1168
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1169
ifname);
1170
}
1171
return false;
1172
}
1173
1174
/* Accept this device */
1175
if(debug){
1176
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1177
}
1178
return true;
1179
}
1180
1181
/*
1182
* This function determines if a directory entry in /sys/class/net
1183
* corresponds to an acceptable network device.
1184
* (This function is passed to scandir(3) as a filter function.)
1185
*/
1186
int good_interface(const struct dirent *if_entry){
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
1191
struct ifreq ifr;
1192
if(not get_flags(if_entry->d_name, &ifr)){
1193
if(debug){
1194
fprintf_plus(stderr, "Failed to get flags for interface "
1195
"\"%s\"\n", if_entry->d_name);
1196
}
1197
return 0;
1198
}
1199
1200
if(not good_flags(if_entry->d_name, &ifr)){
1201
return 0;
1202
}
1203
return 1;
1204
}
1205
1206
/*
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1247
}
1248
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1255
return 0;
1256
}
1257
return 1;
1258
}
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
int ret;
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1326
1327
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1332
}
1333
ret = avahi_simple_poll_iterate(s, -1);
1334
} else {
1335
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1338
}
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1341
if(ret == -1){
1342
perror_plus("clock_gettime");
1343
return -1;
1344
}
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1358
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1361
}
1362
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1368
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1370
return 0;
1371
}
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1374
if(ret == -1){
1375
perror_plus("clock_gettime");
1376
return -1;
1377
}
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1381
}
1382
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
}
1385
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1388
}
1389
}
1390
}
1391
}
1392
1393
bool run_network_hooks(const char *mode, const char *interface,
1394
const float delay){
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1400
if(numhooks == -1){
1401
perror_plus("scandir");
1402
} else {
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1408
if(ret < 0){
1409
perror_plus("asprintf");
1410
continue;
1411
}
1412
if(debug){
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1414
direntry->d_name);
1415
}
1416
pid_t hook_pid = fork();
1417
if(hook_pid == 0){
1418
/* Child */
1419
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1431
/* Set group */
1432
errno = 0;
1433
ret = setgid(0);
1434
if(ret == -1){
1435
perror_plus("setgid");
1436
}
1437
/* Reset supplementary groups */
1438
errno = 0;
1439
ret = setgroups(0, NULL);
1440
if(ret == -1){
1441
perror_plus("setgroups");
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("DEVICE", interface, 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
ret = setenv("MODE", mode, 1);
1462
if(ret == -1){
1463
perror_plus("setenv");
1464
_exit(EX_OSERR);
1465
}
1466
char *delaystring;
1467
ret = asprintf(&delaystring, "%f", delay);
1468
if(ret == -1){
1469
perror_plus("asprintf");
1470
_exit(EX_OSERR);
1471
}
1472
ret = setenv("DELAY", delaystring, 1);
1473
if(ret == -1){
1474
free(delaystring);
1475
perror_plus("setenv");
1476
_exit(EX_OSERR);
1477
}
1478
free(delaystring);
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1481
if(ret == -1){
1482
perror_plus("setenv");
1483
_exit(EX_OSERR);
1484
}
1485
}
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1489
}
1490
} else {
1491
int status;
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1494
free(fullname);
1495
continue;
1496
}
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1502
free(fullname);
1503
continue;
1504
}
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1508
WTERMSIG(status));
1509
free(fullname);
1510
continue;
1511
} else {
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1514
free(fullname);
1515
continue;
1516
}
1517
}
1518
free(fullname);
1519
if(debug){
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1521
direntry->d_name);
1522
}
1523
}
1524
close(devnull);
1525
}
1526
return true;
1527
}
1528
1529
979
int main(int argc, char *argv[]){
1530
980
AvahiSServiceBrowser *sb = NULL;
1531
981
int error;
1533
983
intmax_t tmpmax;
1534
984
char *tmp;
1535
985
int exitcode = EXIT_SUCCESS;
1536
const char *interface = "";
986
const char *interface = "eth0";
1537
987
struct ifreq network;
1538
988
int sd = -1;
1539
989
bool take_down_interface = false;
1540
990
uid_t uid;
1541
991
gid_t gid;
992
char *connect_to = NULL;
1542
993
char tempdir[] = "/tmp/mandosXXXXXX";
1543
994
bool tempdir_created = false;
1544
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1548
999
bool gnutls_initialized = false;
1549
1000
bool gpgme_initialized = false;
1550
1001
float delay = 2.5f;
1551
double retry_interval = 10; /* 10s between trying a server and
1552
retrying the same server again */
1553
1002
1554
1003
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1555
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1561
1010
errno = 0;
1562
1011
ret = setgid(gid);
1563
1012
if(ret == -1){
1564
perror_plus("setgid");
1013
perror("setgid");
1565
1014
}
1566
1015
1567
1016
/* Lower user privileges (temporarily) */
1568
1017
errno = 0;
1569
1018
ret = seteuid(uid);
1570
1019
if(ret == -1){
1571
perror_plus("seteuid");
1020
perror("seteuid");
1572
1021
}
1573
1022
1574
1023
if(quit_now){
1609
1058
.arg = "SECONDS",
1610
1059
.doc = "Maximum delay to wait for interface startup",
1611
1060
.group = 2 },
1612
{ .name = "retry", .key = 132,
1613
.arg = "SECONDS",
1614
.doc = "Retry interval used when denied by the Mandos server",
1615
.group = 2 },
1616
{ .name = "network-hook-dir", .key = 133,
1617
.arg = "DIR",
1618
.doc = "Directory where network hooks are located",
1619
.group = 2 },
1620
/*
1621
* These reproduce what we would get without ARGP_NO_HELP
1622
*/
1623
{ .name = "help", .key = '?',
1624
.doc = "Give this help list", .group = -1 },
1625
{ .name = "usage", .key = -3,
1626
.doc = "Give a short usage message", .group = -1 },
1627
{ .name = "version", .key = 'V',
1628
.doc = "Print program version", .group = -1 },
1629
1061
{ .name = NULL }
1630
1062
};
1631
1063
1632
1064
error_t parse_opt(int key, char *arg,
1633
1065
struct argp_state *state){
1634
errno = 0;
1635
1066
switch(key){
1636
1067
case 128: /* --debug */
1637
1068
debug = true;
1653
1084
tmpmax = strtoimax(arg, &tmp, 10);
1654
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
1655
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1656
argp_error(state, "Bad number of DH bits");
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
1657
1089
}
1658
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1659
1091
break;
1664
1096
errno = 0;
1665
1097
delay = strtof(arg, &tmp);
1666
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
1667
argp_error(state, "Bad delay");
1668
}
1669
case 132: /* --retry */
1670
errno = 0;
1671
retry_interval = strtod(arg, &tmp);
1672
if(errno != 0 or tmp == arg or *tmp != '\0'
1673
or (retry_interval * 1000) > INT_MAX
1674
or retry_interval < 0){
1675
argp_error(state, "Bad retry interval");
1676
}
1677
break;
1678
case 133: /* --network-hook-dir */
1679
hookdir = arg;
1680
break;
1681
/*
1682
* These reproduce what we would get without ARGP_NO_HELP
1683
*/
1684
case '?': /* --help */
1685
argp_state_help(state, state->out_stream,
1686
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1687
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1688
case -3: /* --usage */
1689
argp_state_help(state, state->out_stream,
1690
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1691
case 'V': /* --version */
1692
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1693
exit(argp_err_exit_status);
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
1694
1106
break;
1695
1107
default:
1696
1108
return ARGP_ERR_UNKNOWN;
1697
1109
}
1698
return errno;
1110
return 0;
1699
1111
}
1700
1112
1701
1113
struct argp argp = { .options = options, .parser = parse_opt,
1702
1114
.args_doc = "",
1703
1115
.doc = "Mandos client -- Get and decrypt"
1704
1116
" passwords from a Mandos server" };
1705
ret = argp_parse(&argp, argc, argv,
1706
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1707
switch(ret){
1708
case 0:
1709
break;
1710
case ENOMEM:
1711
default:
1712
errno = ret;
1713
perror_plus("argp_parse");
1714
exitcode = EX_OSERR;
1715
goto end;
1716
case EINVAL:
1717
exitcode = EX_USAGE;
1718
goto end;
1719
}
1720
}
1721
1722
{
1723
/* Work around Debian bug #633582:
1724
<http://bugs.debian.org/633582> */
1725
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1731
} else {
1732
struct stat st;
1733
1734
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1735
int seckey_fd = open(seckey, O_RDONLY);
1736
if(seckey_fd == -1){
1737
perror_plus("open");
1738
} else {
1739
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1740
if(ret == -1){
1741
perror_plus("fstat");
1742
} else {
1743
if(S_ISREG(st.st_mode)
1744
and st.st_uid == 0 and st.st_gid == 0){
1745
ret = fchown(seckey_fd, uid, gid);
1746
if(ret == -1){
1747
perror_plus("fchown");
1748
}
1749
}
1750
}
1751
TEMP_FAILURE_RETRY(close(seckey_fd));
1752
}
1753
}
1754
1755
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1756
int pubkey_fd = open(pubkey, O_RDONLY);
1757
if(pubkey_fd == -1){
1758
perror_plus("open");
1759
} else {
1760
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1761
if(ret == -1){
1762
perror_plus("fstat");
1763
} else {
1764
if(S_ISREG(st.st_mode)
1765
and st.st_uid == 0 and st.st_gid == 0){
1766
ret = fchown(pubkey_fd, uid, gid);
1767
if(ret == -1){
1768
perror_plus("fchown");
1769
}
1770
}
1771
}
1772
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
}
1774
}
1775
1776
/* Lower privileges */
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
1781
}
1782
}
1783
}
1784
1785
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
}
1788
1123
}
1789
1124
1790
1125
if(not debug){
1791
1126
avahi_set_log_function(empty_log);
1792
1127
}
1793
1128
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
1826
1129
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1827
1130
from the signal handler */
1828
1131
/* Initialize the pseudo-RNG for Avahi */
1829
1132
srand((unsigned int) time(NULL));
1830
1133
mc.simple_poll = avahi_simple_poll_new();
1831
1134
if(mc.simple_poll == NULL){
1832
fprintf_plus(stderr,
1833
"Avahi: Failed to create simple poll object.\n");
1834
exitcode = EX_UNAVAILABLE;
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
1835
1137
goto end;
1836
1138
}
1837
1139
1838
1140
sigemptyset(&sigterm_action.sa_mask);
1839
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1840
1142
if(ret == -1){
1841
perror_plus("sigaddset");
1842
exitcode = EX_OSERR;
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
1843
1145
goto end;
1844
1146
}
1845
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1846
1148
if(ret == -1){
1847
perror_plus("sigaddset");
1848
exitcode = EX_OSERR;
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
1849
1151
goto end;
1850
1152
}
1851
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1852
1154
if(ret == -1){
1853
perror_plus("sigaddset");
1854
exitcode = EX_OSERR;
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
1855
1157
goto end;
1856
1158
}
1857
1159
/* Need to check if the handler is SIG_IGN before handling:
1860
1162
*/
1861
1163
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1862
1164
if(ret == -1){
1863
perror_plus("sigaction");
1864
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1865
1167
}
1866
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1867
1169
ret = sigaction(SIGINT, &sigterm_action, NULL);
1868
1170
if(ret == -1){
1869
perror_plus("sigaction");
1870
exitcode = EX_OSERR;
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1871
1173
goto end;
1872
1174
}
1873
1175
}
1874
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1875
1177
if(ret == -1){
1876
perror_plus("sigaction");
1877
return EX_OSERR;
1178
perror("sigaction");
1179
return EXIT_FAILURE;
1878
1180
}
1879
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
1880
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1881
1183
if(ret == -1){
1882
perror_plus("sigaction");
1883
exitcode = EX_OSERR;
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
1884
1186
goto end;
1885
1187
}
1886
1188
}
1887
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1888
1190
if(ret == -1){
1889
perror_plus("sigaction");
1890
return EX_OSERR;
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1891
1193
}
1892
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1893
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1894
1196
if(ret == -1){
1895
perror_plus("sigaction");
1896
exitcode = EX_OSERR;
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1897
1199
goto end;
1898
1200
}
1899
1201
}
1900
1202
1901
1203
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1204
if(interface[0] != '\0'){
1903
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
1206
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1907
1209
goto end;
1908
1210
}
1909
1211
1915
1217
errno = 0;
1916
1218
ret = seteuid(0);
1917
1219
if(ret == -1){
1918
perror_plus("seteuid");
1220
perror("seteuid");
1919
1221
}
1920
1222
1921
1223
#ifdef __linux__
1922
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1225
messages to mess up the prompt */
1924
1226
ret = klogctl(8, NULL, 5);
1925
1227
bool restore_loglevel = true;
1926
1228
if(ret == -1){
1927
1229
restore_loglevel = false;
1928
perror_plus("klogctl");
1230
perror("klogctl");
1929
1231
}
1930
1232
#endif /* __linux__ */
1931
1233
1932
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
1235
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1936
1238
#ifdef __linux__
1937
1239
if(restore_loglevel){
1938
1240
ret = klogctl(7, NULL, 0);
1939
1241
if(ret == -1){
1940
perror_plus("klogctl");
1242
perror("klogctl");
1941
1243
}
1942
1244
}
1943
1245
#endif /* __linux__ */
1945
1247
errno = 0;
1946
1248
ret = seteuid(uid);
1947
1249
if(ret == -1){
1948
perror_plus("seteuid");
1250
perror("seteuid");
1949
1251
}
1950
1252
goto end;
1951
1253
}
1952
1254
strcpy(network.ifr_name, interface);
1953
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
1256
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1257
perror("ioctl SIOCGIFFLAGS");
1956
1258
#ifdef __linux__
1957
1259
if(restore_loglevel){
1958
1260
ret = klogctl(7, NULL, 0);
1959
1261
if(ret == -1){
1960
perror_plus("klogctl");
1262
perror("klogctl");
1961
1263
}
1962
1264
}
1963
1265
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1266
exitcode = EXIT_FAILURE;
1965
1267
/* Lower privileges */
1966
1268
errno = 0;
1967
1269
ret = seteuid(uid);
1968
1270
if(ret == -1){
1969
perror_plus("seteuid");
1271
perror("seteuid");
1970
1272
}
1971
1273
goto end;
1972
1274
}
1976
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
1279
if(ret == -1){
1978
1280
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1981
1283
#ifdef __linux__
1982
1284
if(restore_loglevel){
1983
1285
ret = klogctl(7, NULL, 0);
1984
1286
if(ret == -1){
1985
perror_plus("klogctl");
1287
perror("klogctl");
1986
1288
}
1987
1289
}
1988
1290
#endif /* __linux__ */
1990
1292
errno = 0;
1991
1293
ret = seteuid(uid);
1992
1294
if(ret == -1){
1993
perror_plus("seteuid");
1295
perror("seteuid");
1994
1296
}
1995
1297
goto end;
1996
1298
}
1997
1299
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
1300
/* sleep checking until interface is running */
2000
1301
for(int i=0; i < delay * 4; i++){
2001
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
1303
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
1304
perror("ioctl SIOCGIFFLAGS");
2004
1305
} else if(network.ifr_flags & IFF_RUNNING){
2005
1306
break;
2006
1307
}
2007
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
1309
ret = nanosleep(&sleeptime, NULL);
2009
1310
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
1311
perror("nanosleep");
2011
1312
}
2012
1313
}
2013
1314
if(not take_down_interface){
2014
1315
/* We won't need the socket anymore */
2015
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
1317
if(ret == -1){
2017
perror_plus("close");
1318
perror("close");
2018
1319
}
2019
1320
}
2020
1321
#ifdef __linux__
2022
1323
/* Restores kernel loglevel to default */
2023
1324
ret = klogctl(7, NULL, 0);
2024
1325
if(ret == -1){
2025
perror_plus("klogctl");
1326
perror("klogctl");
2026
1327
}
2027
1328
}
2028
1329
#endif /* __linux__ */
2029
1330
/* Lower privileges */
2030
1331
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
1338
} else {
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
2035
1344
}
2036
1345
}
2037
1346
2041
1350
2042
1351
ret = init_gnutls_global(pubkey, seckey);
2043
1352
if(ret == -1){
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
2045
exitcode = EX_UNAVAILABLE;
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
2046
1355
goto end;
2047
1356
} else {
2048
1357
gnutls_initialized = true;
2052
1361
goto end;
2053
1362
}
2054
1363
1364
tempdir_created = true;
2055
1365
if(mkdtemp(tempdir) == NULL){
2056
perror_plus("mkdtemp");
1366
tempdir_created = false;
1367
perror("mkdtemp");
2057
1368
goto end;
2058
1369
}
2059
tempdir_created = true;
2060
1370
2061
1371
if(quit_now){
2062
1372
goto end;
2063
1373
}
2064
1374
2065
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
2066
fprintf_plus(stderr, "init_gpgme failed\n");
2067
exitcode = EX_UNAVAILABLE;
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
2068
1378
goto end;
2069
1379
} else {
2070
1380
gpgme_initialized = true;
2079
1389
/* (Mainly meant for debugging) */
2080
1390
char *address = strrchr(connect_to, ':');
2081
1391
if(address == NULL){
2082
fprintf_plus(stderr, "No colon in address\n");
2083
exitcode = EX_USAGE;
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
2084
1394
goto end;
2085
1395
}
2086
1396
2093
1403
tmpmax = strtoimax(address+1, &tmp, 10);
2094
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2095
1405
or tmpmax != (uint16_t)tmpmax){
2096
fprintf_plus(stderr, "Bad port number\n");
2097
exitcode = EX_USAGE;
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
2098
1408
goto end;
2099
1409
}
2100
1410
2104
1414
2105
1415
port = (uint16_t)tmpmax;
2106
1416
*address = '\0';
1417
address = connect_to;
2107
1418
/* Colon in address indicates IPv6 */
2108
1419
int af;
2109
if(strchr(connect_to, ':') != NULL){
1420
if(strchr(address, ':') != NULL){
2110
1421
af = AF_INET6;
2111
/* Accept [] around IPv6 address - see RFC 5952 */
2112
if(connect_to[0] == '[' and address[-1] == ']')
2113
{
2114
connect_to++;
2115
address[-1] = '\0';
2116
}
2117
1422
} else {
2118
1423
af = AF_INET;
2119
1424
}
2120
address = connect_to;
2121
1425
2122
1426
if(quit_now){
2123
1427
goto end;
2124
1428
}
2125
1429
2126
while(not quit_now){
2127
ret = start_mandos_communication(address, port, if_index, af);
2128
if(quit_now or ret == 0){
2129
break;
2130
}
2131
if(debug){
2132
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
(int)retry_interval);
2134
}
2135
sleep((int)retry_interval);
2136
}
2137
2138
if (not quit_now){
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
2139
1434
exitcode = EXIT_SUCCESS;
2140
1435
}
2141
2142
1436
goto end;
2143
1437
}
2144
1438
2166
1460
2167
1461
/* Check if creating the Avahi server object succeeded */
2168
1462
if(mc.server == NULL){
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2171
exitcode = EX_UNAVAILABLE;
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
2172
1466
goto end;
2173
1467
}
2174
1468
2181
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
1476
NULL, 0, browse_callback, NULL);
2183
1477
if(sb == NULL){
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
avahi_strerror(avahi_server_errno(mc.server)));
2186
exitcode = EX_UNAVAILABLE;
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
2187
1481
goto end;
2188
1482
}
2189
1483
2194
1488
/* Run the main loop */
2195
1489
2196
1490
if(debug){
2197
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
}
2199
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2202
if(debug){
2203
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
(ret == 0) ? "successfully" : "with error");
2205
}
1491
fprintf(stderr, "Starting Avahi loop search\n");
1492
}
1493
1494
avahi_simple_poll_loop(mc.simple_poll);
2206
1495
2207
1496
end:
2208
1497
2209
1498
if(debug){
2210
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1499
fprintf(stderr, "%s exiting\n", argv[0]);
2211
1500
}
2212
1501
2213
1502
/* Cleanup things */
2230
1519
gpgme_release(mc.ctx);
2231
1520
}
2232
1521
2233
/* Cleans up the circular linked list of Mandos servers the client
2234
has seen */
2235
if(mc.current_server != NULL){
2236
mc.current_server->prev->next = NULL;
2237
while(mc.current_server != NULL){
2238
server *next = mc.current_server->next;
2239
free(mc.current_server);
2240
mc.current_server = next;
2241
}
2242
}
2243
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
2248
{
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
2249
1525
errno = 0;
2250
1526
ret = seteuid(0);
2251
1527
if(ret == -1){
2252
perror_plus("seteuid");
1528
perror("seteuid");
2253
1529
}
2254
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
1530
if(geteuid() == 0){
2257
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
1532
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
2262
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
1537
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1538
perror("ioctl SIOCSIFFLAGS");
2265
1539
}
2266
1540
}
2267
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
1542
if(ret == -1){
2269
perror_plus("close");
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
2270
1550
}
2271
1551
}
2272
1552
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2279
1553
2280
/* Removes the GPGME temp directory and all files inside */
1554
/* Removes the temp directory used by GPGME */
2281
1555
if(tempdir_created){
2282
struct dirent **direntries = NULL;
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2285
alphasort);
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
if(errno != ENOENT){
1561
perror("opendir");
1562
}
1563
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
2289
1576
char *fullname = NULL;
2290
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
2291
1578
direntry->d_name);
2292
1579
if(ret < 0){
2293
perror_plus("asprintf");
1580
perror("asprintf");
2294
1581
continue;
2295
1582
}
2296
1583
ret = remove(fullname);
2297
1584
if(ret == -1){
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
2300
1587
}
2301
1588
free(fullname);
2302
1589
}
2303
}
2304
2305
/* need to clean even if 0 because man page doesn't specify */
2306
free(direntries);
2307
if (numentries == -1){
2308
perror_plus("scandir");
1590
closedir(d);
2309
1591
}
2310
1592
ret = rmdir(tempdir);
2311
1593
if(ret == -1 and errno != ENOENT){
2312
perror_plus("rmdir");
1594
perror("rmdir");
2313
1595
}
2314
1596
}
2315
1597
2316
1598
if(quit_now){
2317
1599
sigemptyset(&old_sigterm_action.sa_mask);
2318
1600
old_sigterm_action.sa_handler = SIG_DFL;
2319
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2320
&old_sigterm_action,
2321
NULL));
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2322
1602
if(ret == -1){
2323
perror_plus("sigaction");
2324
}
2325
do {
2326
ret = raise(signal_received);
2327
} while(ret != 0 and errno == EINTR);
2328
if(ret != 0){
2329
perror_plus("raise");
2330
abort();
2331
}
2332
TEMP_FAILURE_RETRY(pause());
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
2333
1606
}
2334
1607
2335
1608
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0