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- Committer: Teddy Hogeborn
- Date: 2009-09-08 06:28:20 UTC
- Revision ID: teddy@fukt.bsnet.se-20090908062820-xgkdkrnvuze9vc72
* debian/mandos-client.README.Debian: Improved wording and formatting.
Updated location of nfsroot.txt.
* debian/mandos.README.Debian: Improved wording and formatting.
Updated location of nfsroot.txt.
* debian/mandos.README.Debian: Improved wording and formatting.
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 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 */
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
559
474
static int init_gnutls_session(gnutls_session_t *session){
560
475
int ret;
561
476
/* GnuTLS session creation */
562
do {
563
ret = gnutls_init(session, GNUTLS_SERVER);
564
if(quit_now){
565
return -1;
566
}
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_init(session, GNUTLS_SERVER);
568
478
if(ret != GNUTLS_E_SUCCESS){
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
572
481
}
573
482
574
483
{
575
484
const char *err;
576
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
578
if(quit_now){
579
gnutls_deinit(*session);
580
return -1;
581
}
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
583
486
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));
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
587
490
gnutls_deinit(*session);
588
491
return -1;
589
492
}
590
493
}
591
494
592
do {
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
595
if(quit_now){
596
gnutls_deinit(*session);
597
return -1;
598
}
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
600
497
if(ret != GNUTLS_E_SUCCESS){
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
603
500
gnutls_deinit(*session);
604
501
return -1;
605
502
}
606
503
607
504
/* ignore client certificate if any. */
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
609
507
610
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
611
509
616
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
515
__attribute__((unused)) const char *txt){}
618
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
619
520
/* Called when a Mandos server is found */
620
521
static int start_mandos_communication(const char *ip, uint16_t port,
621
522
AvahiIfIndex if_index,
627
528
struct sockaddr_in6 in6;
628
529
} to;
629
530
char *buffer = NULL;
630
char *decrypted_buffer = NULL;
531
char *decrypted_buffer;
631
532
size_t buffer_length = 0;
632
533
size_t buffer_capacity = 0;
633
534
size_t written;
634
int retval = -1;
535
int retval = 0;
635
536
gnutls_session_t session;
636
537
int pf; /* Protocol family */
637
538
638
errno = 0;
639
640
539
if(quit_now){
641
errno = EINTR;
642
540
return -1;
643
541
}
644
542
650
548
pf = PF_INET;
651
549
break;
652
550
default:
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
654
errno = EINVAL;
551
fprintf(stderr, "Bad address family: %d\n", af);
655
552
return -1;
656
553
}
657
554
661
558
}
662
559
663
560
if(debug){
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
562
"\n", ip, port);
666
563
}
667
564
668
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
669
566
if(tcp_sd < 0){
670
int e = errno;
671
perror_plus("socket");
672
errno = e;
567
perror("socket");
568
retval = -1;
673
569
goto mandos_end;
674
570
}
675
571
676
572
if(quit_now){
677
errno = EINTR;
678
573
goto mandos_end;
679
574
}
680
575
687
582
ret = inet_pton(af, ip, &to.in.sin_addr);
688
583
}
689
584
if(ret < 0 ){
690
int e = errno;
691
perror_plus("inet_pton");
692
errno = e;
585
perror("inet_pton");
586
retval = -1;
693
587
goto mandos_end;
694
588
}
695
589
if(ret == 0){
696
int e = errno;
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
698
errno = e;
590
fprintf(stderr, "Bad address: %s\n", ip);
591
retval = -1;
699
592
goto mandos_end;
700
593
}
701
594
if(af == AF_INET6){
705
598
706
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
601
-Wunreachable-code*/
709
602
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;
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
605
retval = -1;
713
606
goto mandos_end;
714
607
}
715
608
/* Set the network interface number as scope */
722
615
}
723
616
724
617
if(quit_now){
725
errno = EINTR;
726
618
goto mandos_end;
727
619
}
728
620
730
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
731
623
char interface[IF_NAMESIZE];
732
624
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
perror_plus("if_indextoname");
625
perror("if_indextoname");
734
626
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
737
629
}
738
630
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
741
633
}
742
634
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
635
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
750
642
sizeof(addrstr));
751
643
}
752
644
if(pcret == NULL){
753
perror_plus("inet_ntop");
645
perror("inet_ntop");
754
646
} else {
755
647
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
648
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
649
}
758
650
}
759
651
}
760
652
761
653
if(quit_now){
762
errno = EINTR;
763
654
goto mandos_end;
764
655
}
765
656
769
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
661
}
771
662
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
663
perror("connect");
664
retval = -1;
777
665
goto mandos_end;
778
666
}
779
667
780
668
if(quit_now){
781
errno = EINTR;
782
669
goto mandos_end;
783
670
}
784
671
787
674
while(true){
788
675
size_t out_size = strlen(out);
789
676
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
790
out_size - written));
677
out_size - written));
791
678
if(ret == -1){
792
int e = errno;
793
perror_plus("write");
794
errno = e;
679
perror("write");
680
retval = -1;
795
681
goto mandos_end;
796
682
}
797
683
written += (size_t)ret;
807
693
}
808
694
809
695
if(quit_now){
810
errno = EINTR;
811
696
goto mandos_end;
812
697
}
813
698
}
814
699
815
700
if(debug){
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
817
702
}
818
703
819
704
if(quit_now){
820
errno = EINTR;
821
705
goto mandos_end;
822
706
}
823
707
824
/* Spurious warning from -Wint-to-pointer-cast */
825
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
826
709
827
710
if(quit_now){
828
errno = EINTR;
829
711
goto mandos_end;
830
712
}
831
713
832
714
do {
833
715
ret = gnutls_handshake(session);
834
716
if(quit_now){
835
errno = EINTR;
836
717
goto mandos_end;
837
718
}
838
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
839
720
840
721
if(ret != GNUTLS_E_SUCCESS){
841
722
if(debug){
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
723
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
843
724
gnutls_perror(ret);
844
725
}
845
errno = EPROTO;
726
retval = -1;
846
727
goto mandos_end;
847
728
}
848
729
849
730
/* Read OpenPGP packet that contains the wanted password */
850
731
851
732
if(debug){
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
734
ip);
854
735
}
855
736
856
737
while(true){
857
738
858
739
if(quit_now){
859
errno = EINTR;
860
740
goto mandos_end;
861
741
}
862
742
863
743
buffer_capacity = incbuffer(&buffer, buffer_length,
864
buffer_capacity);
744
buffer_capacity);
865
745
if(buffer_capacity == 0){
866
int e = errno;
867
perror_plus("incbuffer");
868
errno = e;
746
perror("incbuffer");
747
retval = -1;
869
748
goto mandos_end;
870
749
}
871
750
872
751
if(quit_now){
873
errno = EINTR;
874
752
goto mandos_end;
875
753
}
876
754
889
767
ret = gnutls_handshake(session);
890
768
891
769
if(quit_now){
892
errno = EINTR;
893
770
goto mandos_end;
894
771
}
895
772
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
896
773
if(ret < 0){
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
899
775
gnutls_perror(ret);
900
errno = EPROTO;
776
retval = -1;
901
777
goto mandos_end;
902
778
}
903
779
break;
904
780
default:
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
781
fprintf(stderr, "Unknown error while reading data from"
782
" encrypted session with Mandos server\n");
783
retval = -1;
907
784
gnutls_bye(session, GNUTLS_SHUT_RDWR);
908
errno = EIO;
909
785
goto mandos_end;
910
786
}
911
787
} else {
914
790
}
915
791
916
792
if(debug){
917
fprintf_plus(stderr, "Closing TLS session\n");
918
}
919
920
if(quit_now){
921
errno = EINTR;
922
goto mandos_end;
923
}
924
925
do {
926
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
927
if(quit_now){
928
errno = EINTR;
929
goto mandos_end;
930
}
931
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
793
fprintf(stderr, "Closing TLS session\n");
794
}
795
796
if(quit_now){
797
goto mandos_end;
798
}
799
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
802
if(quit_now){
803
goto mandos_end;
804
}
932
805
933
806
if(buffer_length > 0){
934
807
ssize_t decrypted_buffer_size;
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
809
buffer_length,
936
810
&decrypted_buffer);
937
811
if(decrypted_buffer_size >= 0){
938
812
939
813
written = 0;
940
814
while(written < (size_t) decrypted_buffer_size){
941
815
if(quit_now){
942
errno = EINTR;
943
816
goto mandos_end;
944
817
}
945
818
947
820
(size_t)decrypted_buffer_size - written,
948
821
stdout);
949
822
if(ret == 0 and ferror(stdout)){
950
int e = errno;
951
823
if(debug){
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
824
fprintf(stderr, "Error writing encrypted data: %s\n",
825
strerror(errno));
954
826
}
955
errno = e;
956
goto mandos_end;
827
retval = -1;
828
break;
957
829
}
958
830
written += (size_t)ret;
959
831
}
960
retval = 0;
832
free(decrypted_buffer);
833
} else {
834
retval = -1;
961
835
}
836
} else {
837
retval = -1;
962
838
}
963
839
964
840
/* Shutdown procedure */
965
841
966
842
mandos_end:
967
{
968
int e = errno;
969
free(decrypted_buffer);
970
free(buffer);
971
if(tcp_sd >= 0){
972
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
973
}
974
if(ret == -1){
975
if(e == 0){
976
e = errno;
977
}
978
perror_plus("close");
979
}
980
gnutls_deinit(session);
981
errno = e;
982
if(quit_now){
983
errno = EINTR;
984
retval = -1;
985
}
843
free(buffer);
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
847
if(ret == -1){
848
perror("close");
849
}
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
986
853
}
987
854
return retval;
988
855
}
1013
880
switch(event){
1014
881
default:
1015
882
case AVAHI_RESOLVER_FAILURE:
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
884
" of type '%s' in domain '%s': %s\n", name, type, domain,
885
avahi_strerror(avahi_server_errno(mc.server)));
1020
886
break;
1021
887
1022
888
case AVAHI_RESOLVER_FOUND:
1024
890
char ip[AVAHI_ADDRESS_STR_MAX];
1025
891
avahi_address_snprint(ip, sizeof(ip), address);
1026
892
if(debug){
1027
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
host_name, ip, (intmax_t)interface, port);
893
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
ip, (intmax_t)interface, port);
1030
896
}
1031
897
int ret = start_mandos_communication(ip, port, interface,
1032
898
avahi_proto_to_af(proto));
1033
899
if(ret == 0){
1034
900
avahi_simple_poll_quit(mc.simple_poll);
1035
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
" list\n", name);
1040
}
1041
901
}
1042
902
}
1043
903
}
1067
927
default:
1068
928
case AVAHI_BROWSER_FAILURE:
1069
929
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
930
fprintf(stderr, "(Avahi browser) %s\n",
931
avahi_strerror(avahi_server_errno(mc.server)));
1072
932
avahi_simple_poll_quit(mc.simple_poll);
1073
933
return;
1074
934
1081
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
942
name, type, domain, protocol, 0,
1083
943
resolve_callback, NULL) == NULL)
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
945
name, avahi_strerror(avahi_server_errno(mc.server)));
1087
946
break;
1088
947
1089
948
case AVAHI_BROWSER_REMOVE:
1092
951
case AVAHI_BROWSER_ALL_FOR_NOW:
1093
952
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1094
953
if(debug){
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
954
fprintf(stderr, "No Mandos server found, still searching...\n");
1097
955
}
1098
956
break;
1099
957
}
1100
958
}
1101
959
1102
/* Signal handler that stops main loop after SIGTERM */
960
/* stop main loop after sigterm has been called */
1103
961
static void handle_sigterm(int sig){
1104
962
if(quit_now){
1105
963
return;
1107
965
quit_now = 1;
1108
966
signal_received = sig;
1109
967
int old_errno = errno;
1110
/* set main loop to exit */
1111
968
if(mc.simple_poll != NULL){
1112
969
avahi_simple_poll_quit(mc.simple_poll);
1113
970
}
1114
971
errno = old_errno;
1115
972
}
1116
973
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
int ret;
1119
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
if(s < 0){
1122
perror_plus("socket");
1123
return false;
1124
}
1125
strcpy(ifr->ifr_name, ifname);
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
if(ret == -1){
1128
if(debug){
1129
perror_plus("ioctl SIOCGIFFLAGS");
1130
}
1131
return false;
1132
}
1133
return true;
1134
}
1135
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1138
/* Reject the loopback device */
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1140
if(debug){
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1143
}
1144
return false;
1145
}
1146
/* Accept point-to-point devices only if connect_to is specified */
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1148
if(debug){
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1151
}
1152
return true;
1153
}
1154
/* Otherwise, reject non-broadcast-capable devices */
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1156
if(debug){
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1159
}
1160
return false;
1161
}
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1163
if(ifr->ifr_flags & IFF_NOARP){
1164
if(debug){
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1167
}
1168
return false;
1169
}
1170
1171
/* Accept this device */
1172
if(debug){
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1174
}
1175
return true;
1176
}
1177
1178
/*
1179
* This function determines if a directory entry in /sys/class/net
1180
* corresponds to an acceptable network device.
1181
* (This function is passed to scandir(3) as a filter function.)
1182
*/
1183
int good_interface(const struct dirent *if_entry){
1184
if(if_entry->d_name[0] == '.'){
1185
return 0;
1186
}
1187
1188
struct ifreq ifr;
1189
if(not get_flags(if_entry->d_name, &ifr)){
1190
if(debug){
1191
fprintf_plus(stderr, "Failed to get flags for interface "
1192
"\"%s\"\n", if_entry->d_name);
1193
}
1194
return 0;
1195
}
1196
1197
if(not good_flags(if_entry->d_name, &ifr)){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1246
int notdotentries(const struct dirent *direntry){
1247
/* Skip "." and ".." */
1248
if(direntry->d_name[0] == '.'
1249
and (direntry->d_name[1] == '\0'
1250
or (direntry->d_name[1] == '.'
1251
and direntry->d_name[2] == '\0'))){
1252
return 0;
1253
}
1254
return 1;
1255
}
1256
1257
/* Is this directory entry a runnable program? */
1258
int runnable_hook(const struct dirent *direntry){
1259
int ret;
1260
size_t sret;
1261
struct stat st;
1262
1263
if((direntry->d_name)[0] == '\0'){
1264
/* Empty name? */
1265
return 0;
1266
}
1267
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
"abcdefghijklmnopqrstuvwxyz"
1270
"0123456789"
1271
"_-");
1272
if((direntry->d_name)[sret] != '\0'){
1273
/* Contains non-allowed characters */
1274
if(debug){
1275
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1276
direntry->d_name);
1277
}
1278
return 0;
1279
}
1280
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1289
if(ret == -1){
1290
if(debug){
1291
perror_plus("Could not stat hook");
1292
}
1293
return 0;
1294
}
1295
if(not (S_ISREG(st.st_mode))){
1296
/* Not a regular file */
1297
if(debug){
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1299
direntry->d_name);
1300
}
1301
return 0;
1302
}
1303
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1304
/* Not executable */
1305
if(debug){
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
direntry->d_name);
1308
}
1309
return 0;
1310
}
1311
if(debug){
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1313
direntry->d_name);
1314
}
1315
return 1;
1316
}
1317
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1319
int ret;
1320
struct timespec now;
1321
struct timespec waited_time;
1322
intmax_t block_time;
1323
1324
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1329
}
1330
ret = avahi_simple_poll_iterate(s, -1);
1331
} else {
1332
if (debug){
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1335
}
1336
/* the current time */
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1338
if(ret == -1){
1339
perror_plus("clock_gettime");
1340
return -1;
1341
}
1342
/* Calculating in ms how long time between now and server
1343
who we visted longest time ago. Now - last seen. */
1344
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1346
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1348
/* total time is 10s/10,000ms.
1349
Converting to s from ms by dividing by 1,000,
1350
and ns to ms by dividing by 1,000,000. */
1351
block_time = ((retry_interval
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1355
if (debug){
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1358
}
1359
1360
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1365
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1367
return 0;
1368
}
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1371
if(ret == -1){
1372
perror_plus("clock_gettime");
1373
return -1;
1374
}
1375
mc.current_server = mc.current_server->next;
1376
block_time = 0; /* Call avahi to find new Mandos
1377
servers, but don't block */
1378
}
1379
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
}
1382
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1384
return (ret != 1) ? ret : 0;
1385
}
1386
}
1387
}
1388
}
1389
1390
bool run_network_hooks(const char *mode, const char *interface,
1391
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1397
if(numhooks == -1){
1398
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1406
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1475
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
1524
}
1525
1526
974
int main(int argc, char *argv[]){
1527
975
AvahiSServiceBrowser *sb = NULL;
1528
976
int error;
1530
978
intmax_t tmpmax;
1531
979
char *tmp;
1532
980
int exitcode = EXIT_SUCCESS;
1533
const char *interface = "";
981
const char *interface = "eth0";
1534
982
struct ifreq network;
1535
983
int sd = -1;
1536
984
bool take_down_interface = false;
1537
985
uid_t uid;
1538
986
gid_t gid;
987
char *connect_to = NULL;
1539
988
char tempdir[] = "/tmp/mandosXXXXXX";
1540
989
bool tempdir_created = false;
1541
990
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1545
994
bool gnutls_initialized = false;
1546
995
bool gpgme_initialized = false;
1547
996
float delay = 2.5f;
1548
double retry_interval = 10; /* 10s between trying a server and
1549
retrying the same server again */
1550
997
1551
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
998
struct sigaction old_sigterm_action;
1552
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1553
1000
1554
uid = getuid();
1555
gid = getgid();
1556
1557
/* Lower any group privileges we might have, just to be safe */
1558
errno = 0;
1559
ret = setgid(gid);
1560
if(ret == -1){
1561
perror_plus("setgid");
1562
}
1563
1564
/* Lower user privileges (temporarily) */
1565
errno = 0;
1566
ret = seteuid(uid);
1567
if(ret == -1){
1568
perror_plus("seteuid");
1569
}
1570
1571
if(quit_now){
1572
goto end;
1573
}
1574
1575
1001
{
1576
1002
struct argp_option options[] = {
1577
1003
{ .name = "debug", .key = 128,
1606
1032
.arg = "SECONDS",
1607
1033
.doc = "Maximum delay to wait for interface startup",
1608
1034
.group = 2 },
1609
{ .name = "retry", .key = 132,
1610
.arg = "SECONDS",
1611
.doc = "Retry interval used when denied by the Mandos server",
1612
.group = 2 },
1613
{ .name = "network-hook-dir", .key = 133,
1614
.arg = "DIR",
1615
.doc = "Directory where network hooks are located",
1616
.group = 2 },
1617
/*
1618
* These reproduce what we would get without ARGP_NO_HELP
1619
*/
1620
{ .name = "help", .key = '?',
1621
.doc = "Give this help list", .group = -1 },
1622
{ .name = "usage", .key = -3,
1623
.doc = "Give a short usage message", .group = -1 },
1624
{ .name = "version", .key = 'V',
1625
.doc = "Print program version", .group = -1 },
1626
1035
{ .name = NULL }
1627
1036
};
1628
1037
1629
1038
error_t parse_opt(int key, char *arg,
1630
1039
struct argp_state *state){
1631
errno = 0;
1632
1040
switch(key){
1633
1041
case 128: /* --debug */
1634
1042
debug = true;
1650
1058
tmpmax = strtoimax(arg, &tmp, 10);
1651
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
1652
1060
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1653
argp_error(state, "Bad number of DH bits");
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
1654
1063
}
1655
1064
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1656
1065
break;
1661
1070
errno = 0;
1662
1071
delay = strtof(arg, &tmp);
1663
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
1664
argp_error(state, "Bad delay");
1665
}
1666
case 132: /* --retry */
1667
errno = 0;
1668
retry_interval = strtod(arg, &tmp);
1669
if(errno != 0 or tmp == arg or *tmp != '\0'
1670
or (retry_interval * 1000) > INT_MAX
1671
or retry_interval < 0){
1672
argp_error(state, "Bad retry interval");
1673
}
1674
break;
1675
case 133: /* --network-hook-dir */
1676
hookdir = arg;
1677
break;
1678
/*
1679
* These reproduce what we would get without ARGP_NO_HELP
1680
*/
1681
case '?': /* --help */
1682
argp_state_help(state, state->out_stream,
1683
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1684
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1685
case -3: /* --usage */
1686
argp_state_help(state, state->out_stream,
1687
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1688
case 'V': /* --version */
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1690
exit(argp_err_exit_status);
1073
fprintf(stderr, "Bad delay\n");
1074
exit(EXIT_FAILURE);
1075
}
1076
break;
1077
case ARGP_KEY_ARG:
1078
argp_usage(state);
1079
case ARGP_KEY_END:
1691
1080
break;
1692
1081
default:
1693
1082
return ARGP_ERR_UNKNOWN;
1694
1083
}
1695
return errno;
1084
return 0;
1696
1085
}
1697
1086
1698
1087
struct argp argp = { .options = options, .parser = parse_opt,
1699
1088
.args_doc = "",
1700
1089
.doc = "Mandos client -- Get and decrypt"
1701
1090
" passwords from a Mandos server" };
1702
ret = argp_parse(&argp, argc, argv,
1703
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1704
switch(ret){
1705
case 0:
1706
break;
1707
case ENOMEM:
1708
default:
1709
errno = ret;
1710
perror_plus("argp_parse");
1711
exitcode = EX_OSERR;
1712
goto end;
1713
case EINVAL:
1714
exitcode = EX_USAGE;
1715
goto end;
1716
}
1717
}
1718
1719
{
1720
/* Work around Debian bug #633582:
1721
<http://bugs.debian.org/633582> */
1722
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
1728
} else {
1729
struct stat st;
1730
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1732
int seckey_fd = open(seckey, O_RDONLY);
1733
if(seckey_fd == -1){
1734
perror_plus("open");
1735
} else {
1736
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1737
if(ret == -1){
1738
perror_plus("fstat");
1739
} else {
1740
if(S_ISREG(st.st_mode)
1741
and st.st_uid == 0 and st.st_gid == 0){
1742
ret = fchown(seckey_fd, uid, gid);
1743
if(ret == -1){
1744
perror_plus("fchown");
1745
}
1746
}
1747
}
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
1749
}
1750
}
1751
1752
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
int pubkey_fd = open(pubkey, O_RDONLY);
1754
if(pubkey_fd == -1){
1755
perror_plus("open");
1756
} else {
1757
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1758
if(ret == -1){
1759
perror_plus("fstat");
1760
} else {
1761
if(S_ISREG(st.st_mode)
1762
and st.st_uid == 0 and st.st_gid == 0){
1763
ret = fchown(pubkey_fd, uid, gid);
1764
if(ret == -1){
1765
perror_plus("fchown");
1766
}
1767
}
1768
}
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
1773
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
}
1780
}
1781
1782
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
1095
goto end;
1096
}
1785
1097
}
1786
1098
1787
1099
if(not debug){
1788
1100
avahi_set_log_function(empty_log);
1789
1101
}
1790
1102
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
1823
1103
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
1104
from the signal handler */
1825
1105
/* Initialize the pseudo-RNG for Avahi */
1826
1106
srand((unsigned int) time(NULL));
1827
1107
mc.simple_poll = avahi_simple_poll_new();
1828
1108
if(mc.simple_poll == NULL){
1829
fprintf_plus(stderr,
1830
"Avahi: Failed to create simple poll object.\n");
1831
exitcode = EX_UNAVAILABLE;
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
1832
1111
goto end;
1833
1112
}
1834
1113
1835
1114
sigemptyset(&sigterm_action.sa_mask);
1836
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1837
1116
if(ret == -1){
1838
perror_plus("sigaddset");
1839
exitcode = EX_OSERR;
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
1840
1119
goto end;
1841
1120
}
1842
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1843
1122
if(ret == -1){
1844
perror_plus("sigaddset");
1845
exitcode = EX_OSERR;
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
1846
1125
goto end;
1847
1126
}
1848
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1849
1128
if(ret == -1){
1850
perror_plus("sigaddset");
1851
exitcode = EX_OSERR;
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
1852
1131
goto end;
1853
1132
}
1854
1133
/* Need to check if the handler is SIG_IGN before handling:
1857
1136
*/
1858
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1859
1138
if(ret == -1){
1860
perror_plus("sigaction");
1861
return EX_OSERR;
1139
perror("sigaction");
1140
return EXIT_FAILURE;
1862
1141
}
1863
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
1864
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
1865
1144
if(ret == -1){
1866
perror_plus("sigaction");
1867
exitcode = EX_OSERR;
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
1868
1147
goto end;
1869
1148
}
1870
1149
}
1871
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1872
1151
if(ret == -1){
1873
perror_plus("sigaction");
1874
return EX_OSERR;
1152
perror("sigaction");
1153
return EXIT_FAILURE;
1875
1154
}
1876
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
1877
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1878
1157
if(ret == -1){
1879
perror_plus("sigaction");
1880
exitcode = EX_OSERR;
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
1881
1160
goto end;
1882
1161
}
1883
1162
}
1884
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1885
1164
if(ret == -1){
1886
perror_plus("sigaction");
1887
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1888
1167
}
1889
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1890
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1891
1170
if(ret == -1){
1892
perror_plus("sigaction");
1893
exitcode = EX_OSERR;
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1894
1173
goto end;
1895
1174
}
1896
1175
}
1897
1176
1898
1177
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1178
if(interface[0] != '\0'){
1900
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
1180
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1904
1183
goto end;
1905
1184
}
1906
1185
1908
1187
goto end;
1909
1188
}
1910
1189
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
1190
#ifdef __linux__
1919
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1192
messages to mess up the prompt */
1921
1193
ret = klogctl(8, NULL, 5);
1922
1194
bool restore_loglevel = true;
1923
1195
if(ret == -1){
1924
1196
restore_loglevel = false;
1925
perror_plus("klogctl");
1197
perror("klogctl");
1926
1198
}
1927
1199
#endif /* __linux__ */
1928
1200
1929
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
1202
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1203
perror("socket");
1204
exitcode = EXIT_FAILURE;
1933
1205
#ifdef __linux__
1934
1206
if(restore_loglevel){
1935
1207
ret = klogctl(7, NULL, 0);
1936
1208
if(ret == -1){
1937
perror_plus("klogctl");
1209
perror("klogctl");
1938
1210
}
1939
1211
}
1940
1212
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
1213
goto end;
1948
1214
}
1949
1215
strcpy(network.ifr_name, interface);
1950
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
1217
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1218
perror("ioctl SIOCGIFFLAGS");
1953
1219
#ifdef __linux__
1954
1220
if(restore_loglevel){
1955
1221
ret = klogctl(7, NULL, 0);
1956
1222
if(ret == -1){
1957
perror_plus("klogctl");
1223
perror("klogctl");
1958
1224
}
1959
1225
}
1960
1226
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1227
exitcode = EXIT_FAILURE;
1968
1228
goto end;
1969
1229
}
1970
1230
if((network.ifr_flags & IFF_UP) == 0){
1973
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
1234
if(ret == -1){
1975
1235
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1978
1238
#ifdef __linux__
1979
1239
if(restore_loglevel){
1980
1240
ret = klogctl(7, NULL, 0);
1981
1241
if(ret == -1){
1982
perror_plus("klogctl");
1242
perror("klogctl");
1983
1243
}
1984
1244
}
1985
1245
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
1246
goto end;
1993
1247
}
1994
1248
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1249
/* sleep checking until interface is running */
1997
1250
for(int i=0; i < delay * 4; i++){
1998
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
1252
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
1253
perror("ioctl SIOCGIFFLAGS");
2001
1254
} else if(network.ifr_flags & IFF_RUNNING){
2002
1255
break;
2003
1256
}
2004
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
1258
ret = nanosleep(&sleeptime, NULL);
2006
1259
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
1260
perror("nanosleep");
2008
1261
}
2009
1262
}
2010
1263
if(not take_down_interface){
2011
1264
/* We won't need the socket anymore */
2012
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
1266
if(ret == -1){
2014
perror_plus("close");
1267
perror("close");
2015
1268
}
2016
1269
}
2017
1270
#ifdef __linux__
2019
1272
/* Restores kernel loglevel to default */
2020
1273
ret = klogctl(7, NULL, 0);
2021
1274
if(ret == -1){
2022
perror_plus("klogctl");
1275
perror("klogctl");
2023
1276
}
2024
1277
}
2025
1278
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1283
}
1284
1285
uid = getuid();
1286
gid = getgid();
1287
1288
/* Drop any group privileges we might have, just to be safe */
1289
errno = 0;
1290
ret = setgid(gid);
1291
if(ret == -1){
1292
perror("setgid");
1293
}
1294
1295
/* Drop user privileges */
1296
errno = 0;
1297
/* Will we need privileges later? */
1298
if(take_down_interface){
1299
/* Drop user privileges temporarily */
2029
1300
ret = seteuid(uid);
2030
1301
if(ret == -1){
2031
perror_plus("seteuid");
1302
perror("seteuid");
1303
}
1304
} else {
1305
/* Drop user privileges permanently */
1306
ret = setuid(uid);
1307
if(ret == -1){
1308
perror("setuid");
2032
1309
}
2033
1310
}
2034
1311
2038
1315
2039
1316
ret = init_gnutls_global(pubkey, seckey);
2040
1317
if(ret == -1){
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
exitcode = EX_UNAVAILABLE;
1318
fprintf(stderr, "init_gnutls_global failed\n");
1319
exitcode = EXIT_FAILURE;
2043
1320
goto end;
2044
1321
} else {
2045
1322
gnutls_initialized = true;
2049
1326
goto end;
2050
1327
}
2051
1328
1329
tempdir_created = true;
2052
1330
if(mkdtemp(tempdir) == NULL){
2053
perror_plus("mkdtemp");
1331
tempdir_created = false;
1332
perror("mkdtemp");
2054
1333
goto end;
2055
1334
}
2056
tempdir_created = true;
2057
1335
2058
1336
if(quit_now){
2059
1337
goto end;
2060
1338
}
2061
1339
2062
1340
if(not init_gpgme(pubkey, seckey, tempdir)){
2063
fprintf_plus(stderr, "init_gpgme failed\n");
2064
exitcode = EX_UNAVAILABLE;
1341
fprintf(stderr, "init_gpgme failed\n");
1342
exitcode = EXIT_FAILURE;
2065
1343
goto end;
2066
1344
} else {
2067
1345
gpgme_initialized = true;
2076
1354
/* (Mainly meant for debugging) */
2077
1355
char *address = strrchr(connect_to, ':');
2078
1356
if(address == NULL){
2079
fprintf_plus(stderr, "No colon in address\n");
2080
exitcode = EX_USAGE;
1357
fprintf(stderr, "No colon in address\n");
1358
exitcode = EXIT_FAILURE;
2081
1359
goto end;
2082
1360
}
2083
1361
2090
1368
tmpmax = strtoimax(address+1, &tmp, 10);
2091
1369
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
1370
or tmpmax != (uint16_t)tmpmax){
2093
fprintf_plus(stderr, "Bad port number\n");
2094
exitcode = EX_USAGE;
1371
fprintf(stderr, "Bad port number\n");
1372
exitcode = EXIT_FAILURE;
2095
1373
goto end;
2096
1374
}
2097
1375
2101
1379
2102
1380
port = (uint16_t)tmpmax;
2103
1381
*address = '\0';
1382
address = connect_to;
2104
1383
/* Colon in address indicates IPv6 */
2105
1384
int af;
2106
if(strchr(connect_to, ':') != NULL){
1385
if(strchr(address, ':') != NULL){
2107
1386
af = AF_INET6;
2108
/* Accept [] around IPv6 address - see RFC 5952 */
2109
if(connect_to[0] == '[' and address[-1] == ']')
2110
{
2111
connect_to++;
2112
address[-1] = '\0';
2113
}
2114
1387
} else {
2115
1388
af = AF_INET;
2116
1389
}
2117
address = connect_to;
2118
1390
2119
1391
if(quit_now){
2120
1392
goto end;
2121
1393
}
2122
1394
2123
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2125
if(quit_now or ret == 0){
2126
break;
2127
}
2128
if(debug){
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
(int)retry_interval);
2131
}
2132
sleep((int)retry_interval);
2133
}
2134
2135
if (not quit_now){
1395
ret = start_mandos_communication(address, port, if_index, af);
1396
if(ret < 0){
1397
exitcode = EXIT_FAILURE;
1398
} else {
2136
1399
exitcode = EXIT_SUCCESS;
2137
1400
}
2138
2139
1401
goto end;
2140
1402
}
2141
1403
2163
1425
2164
1426
/* Check if creating the Avahi server object succeeded */
2165
1427
if(mc.server == NULL){
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2168
exitcode = EX_UNAVAILABLE;
1428
fprintf(stderr, "Failed to create Avahi server: %s\n",
1429
avahi_strerror(error));
1430
exitcode = EXIT_FAILURE;
2169
1431
goto end;
2170
1432
}
2171
1433
2178
1440
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
1441
NULL, 0, browse_callback, NULL);
2180
1442
if(sb == NULL){
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
avahi_strerror(avahi_server_errno(mc.server)));
2183
exitcode = EX_UNAVAILABLE;
1443
fprintf(stderr, "Failed to create service browser: %s\n",
1444
avahi_strerror(avahi_server_errno(mc.server)));
1445
exitcode = EXIT_FAILURE;
2184
1446
goto end;
2185
1447
}
2186
1448
2191
1453
/* Run the main loop */
2192
1454
2193
1455
if(debug){
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
}
2196
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2199
if(debug){
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
(ret == 0) ? "successfully" : "with error");
2202
}
1456
fprintf(stderr, "Starting Avahi loop search\n");
1457
}
1458
1459
avahi_simple_poll_loop(mc.simple_poll);
2203
1460
2204
1461
end:
2205
1462
2206
1463
if(debug){
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1464
fprintf(stderr, "%s exiting\n", argv[0]);
2208
1465
}
2209
1466
2210
1467
/* Cleanup things */
2227
1484
gpgme_release(mc.ctx);
2228
1485
}
2229
1486
2230
/* Cleans up the circular linked list of Mandos servers the client
2231
has seen */
2232
if(mc.current_server != NULL){
2233
mc.current_server->prev->next = NULL;
2234
while(mc.current_server != NULL){
2235
server *next = mc.current_server->next;
2236
free(mc.current_server);
2237
mc.current_server = next;
2238
}
2239
}
2240
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2245
{
1487
/* Take down the network interface */
1488
if(take_down_interface){
1489
/* Re-raise priviliges */
2246
1490
errno = 0;
2247
1491
ret = seteuid(0);
2248
1492
if(ret == -1){
2249
perror_plus("seteuid");
1493
perror("seteuid");
2250
1494
}
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
1495
if(geteuid() == 0){
2254
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
1497
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_UP) {
1500
network.ifr_flags &= ~IFF_UP; /* clear flag */
2259
1501
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
1502
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1503
perror("ioctl SIOCSIFFLAGS");
2262
1504
}
2263
1505
}
2264
1506
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
1507
if(ret == -1){
2266
perror_plus("close");
1508
perror("close");
1509
}
1510
/* Lower privileges, permanently this time */
1511
errno = 0;
1512
ret = setuid(uid);
1513
if(ret == -1){
1514
perror("setuid");
2267
1515
}
2268
1516
}
2269
1517
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2276
1518
2277
/* Removes the GPGME temp directory and all files inside */
1519
/* Removes the temp directory used by GPGME */
2278
1520
if(tempdir_created){
2279
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
1521
DIR *d;
1522
struct dirent *direntry;
1523
d = opendir(tempdir);
1524
if(d == NULL){
1525
if(errno != ENOENT){
1526
perror("opendir");
1527
}
1528
} else {
1529
while(true){
1530
direntry = readdir(d);
1531
if(direntry == NULL){
1532
break;
1533
}
1534
/* Skip "." and ".." */
1535
if(direntry->d_name[0] == '.'
1536
and (direntry->d_name[1] == '\0'
1537
or (direntry->d_name[1] == '.'
1538
and direntry->d_name[2] == '\0'))){
1539
continue;
1540
}
2286
1541
char *fullname = NULL;
2287
1542
ret = asprintf(&fullname, "%s/%s", tempdir,
2288
1543
direntry->d_name);
2289
1544
if(ret < 0){
2290
perror_plus("asprintf");
1545
perror("asprintf");
2291
1546
continue;
2292
1547
}
2293
1548
ret = remove(fullname);
2294
1549
if(ret == -1){
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
1550
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1551
strerror(errno));
2297
1552
}
2298
1553
free(fullname);
2299
1554
}
2300
}
2301
2302
/* need to clean even if 0 because man page doesn't specify */
2303
free(direntries);
2304
if (numentries == -1){
2305
perror_plus("scandir");
1555
closedir(d);
2306
1556
}
2307
1557
ret = rmdir(tempdir);
2308
1558
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
1559
perror("rmdir");
2310
1560
}
2311
1561
}
2312
1562
2313
1563
if(quit_now){
2314
1564
sigemptyset(&old_sigterm_action.sa_mask);
2315
1565
old_sigterm_action.sa_handler = SIG_DFL;
2316
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2317
&old_sigterm_action,
2318
NULL));
1566
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2319
1567
if(ret == -1){
2320
perror_plus("sigaction");
2321
}
2322
do {
2323
ret = raise(signal_received);
2324
} while(ret != 0 and errno == EINTR);
2325
if(ret != 0){
2326
perror_plus("raise");
2327
abort();
2328
}
2329
TEMP_FAILURE_RETRY(pause());
1568
perror("sigaction");
1569
}
1570
raise(signal_received);
2330
1571
}
2331
1572
2332
1573
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0