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237.2.131
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-09-10 17:21:36 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-20090910172136-plhvv6jjz8bjrhz4
* plugins.d/mandos-client.c (init_gnutls_session): Retry interrupted
GnuTLS functions.
(main): Drop privileges early, and raise them only where needed and
lower them whenever possible.
GnuTLS functions.
(main): Drop privileges early, and raise them only where needed and
lower them whenever possible.
- 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
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
186
144
187
145
/*
188
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
190
148
* "buffer_length" is how much is already used.
191
149
*/
192
150
size_t incbuffer(char **buffer, size_t buffer_length,
193
size_t buffer_capacity){
151
size_t buffer_capacity){
194
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
154
if(buffer == NULL){
201
159
return buffer_capacity;
202
160
}
203
161
204
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
207
int ret;
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
211
return -1;
212
}
213
*new_server = (server){ .ip = strdup(ip),
214
.port = port,
215
.if_index = if_index,
216
.af = af };
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
219
return -1;
220
}
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
227
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
239
}
240
241
162
/*
242
163
* Initialize GPGME.
243
164
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
246
167
gpgme_error_t rc;
247
168
gpgme_engine_info_t engine_info;
248
169
257
178
258
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
259
180
if(fd == -1){
260
perror_plus("open");
181
perror("open");
261
182
return false;
262
183
}
263
184
264
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
265
186
if(rc != GPG_ERR_NO_ERROR){
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
268
189
return false;
269
190
}
270
191
271
192
rc = gpgme_op_import(mc.ctx, pgp_data);
272
193
if(rc != GPG_ERR_NO_ERROR){
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
275
196
return false;
276
197
}
277
198
278
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
200
if(ret == -1){
280
perror_plus("close");
201
perror("close");
281
202
}
282
203
gpgme_data_release(pgp_data);
283
204
return true;
284
205
}
285
206
286
207
if(debug){
287
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
288
209
}
289
210
290
211
/* Init GPGME */
291
212
gpgme_check_version(NULL);
292
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
293
214
if(rc != GPG_ERR_NO_ERROR){
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
296
217
return false;
297
218
}
298
219
299
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
300
221
rc = gpgme_get_engine_info(&engine_info);
301
222
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
304
225
return false;
305
226
}
306
227
while(engine_info != NULL){
312
233
engine_info = engine_info->next;
313
234
}
314
235
if(engine_info == NULL){
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
317
237
return false;
318
238
}
319
239
320
240
/* Create new GPGME "context" */
321
241
rc = gpgme_new(&(mc.ctx));
322
242
if(rc != GPG_ERR_NO_ERROR){
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
326
245
return false;
327
246
}
328
247
347
266
ssize_t plaintext_length = 0;
348
267
349
268
if(debug){
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
351
270
}
352
271
353
272
/* Create new GPGME data buffer from memory cryptotext */
354
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
355
274
0);
356
275
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
359
278
return -1;
360
279
}
361
280
362
281
/* Create new empty GPGME data buffer for the plaintext */
363
282
rc = gpgme_data_new(&dh_plain);
364
283
if(rc != GPG_ERR_NO_ERROR){
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
368
286
gpgme_data_release(dh_crypto);
369
287
return -1;
370
288
}
373
291
data buffer */
374
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
375
293
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
378
296
plaintext_length = -1;
379
297
if(debug){
380
298
gpgme_decrypt_result_t result;
381
299
result = gpgme_op_decrypt_result(mc.ctx);
382
300
if(result == NULL){
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
302
} else {
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
389
307
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
391
309
}
392
310
gpgme_recipient_t recipient;
393
311
recipient = result->recipients;
394
312
while(recipient != NULL){
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
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");
402
319
recipient = recipient->next;
403
320
}
404
321
}
407
324
}
408
325
409
326
if(debug){
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
328
}
412
329
413
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
414
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
415
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
416
333
plaintext_length = -1;
417
334
goto decrypt_end;
418
335
}
420
337
*plaintext = NULL;
421
338
while(true){
422
339
plaintext_capacity = incbuffer(plaintext,
423
(size_t)plaintext_length,
424
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
425
342
if(plaintext_capacity == 0){
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
429
346
}
430
347
431
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
436
353
break;
437
354
}
438
355
if(ret < 0){
439
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
440
357
plaintext_length = -1;
441
358
goto decrypt_end;
442
359
}
444
361
}
445
362
446
363
if(debug){
447
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
448
365
for(ssize_t i = 0; i < plaintext_length; i++){
449
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
450
367
}
472
389
/* GnuTLS log function callback */
473
390
static void debuggnutls(__attribute__((unused)) int level,
474
391
const char* string){
475
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
476
393
}
477
394
478
395
static int init_gnutls_global(const char *pubkeyfilename,
480
397
int ret;
481
398
482
399
if(debug){
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
484
401
}
485
402
486
403
ret = gnutls_global_init();
487
404
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
490
407
return -1;
491
408
}
492
409
499
416
}
500
417
501
418
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
503
420
if(ret != GNUTLS_E_SUCCESS){
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
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));
506
426
gnutls_global_deinit();
507
427
return -1;
508
428
}
509
429
510
430
if(debug){
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
515
434
}
516
435
517
436
ret = gnutls_certificate_set_openpgp_key_file
518
437
(mc.cred, pubkeyfilename, seckeyfilename,
519
438
GNUTLS_OPENPGP_FMT_BASE64);
520
439
if(ret != GNUTLS_E_SUCCESS){
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
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));
526
445
goto globalfail;
527
446
}
528
447
529
448
/* GnuTLS server initialization */
530
449
ret = gnutls_dh_params_init(&mc.dh_params);
531
450
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
535
453
goto globalfail;
536
454
}
537
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
456
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
541
459
goto globalfail;
542
460
}
543
461
558
476
/* GnuTLS session creation */
559
477
do {
560
478
ret = gnutls_init(session, GNUTLS_SERVER);
561
if(quit_now){
562
return -1;
563
}
564
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
565
480
if(ret != GNUTLS_E_SUCCESS){
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
569
483
}
570
484
571
485
{
572
486
const char *err;
573
487
do {
574
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
575
if(quit_now){
576
gnutls_deinit(*session);
577
return -1;
578
}
579
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
580
490
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Syntax error at: %s\n", err);
492
fprintf(stderr, "GnuTLS error: %s\n",
493
safer_gnutls_strerror(ret));
584
494
gnutls_deinit(*session);
585
495
return -1;
586
496
}
589
499
do {
590
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
501
mc.cred);
592
if(quit_now){
593
gnutls_deinit(*session);
594
return -1;
595
}
596
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
597
503
if(ret != GNUTLS_E_SUCCESS){
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
safer_gnutls_strerror(ret));
600
506
gnutls_deinit(*session);
601
507
return -1;
602
508
}
613
519
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
614
520
__attribute__((unused)) const char *txt){}
615
521
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
616
525
/* Called when a Mandos server is found */
617
526
static int start_mandos_communication(const char *ip, uint16_t port,
618
527
AvahiIfIndex if_index,
624
533
struct sockaddr_in6 in6;
625
534
} to;
626
535
char *buffer = NULL;
627
char *decrypted_buffer = NULL;
536
char *decrypted_buffer;
628
537
size_t buffer_length = 0;
629
538
size_t buffer_capacity = 0;
630
539
size_t written;
631
int retval = -1;
540
int retval = 0;
632
541
gnutls_session_t session;
633
542
int pf; /* Protocol family */
634
543
635
errno = 0;
636
637
544
if(quit_now){
638
errno = EINTR;
639
545
return -1;
640
546
}
641
547
647
553
pf = PF_INET;
648
554
break;
649
555
default:
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
651
errno = EINVAL;
556
fprintf(stderr, "Bad address family: %d\n", af);
652
557
return -1;
653
558
}
654
559
658
563
}
659
564
660
565
if(debug){
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
567
"\n", ip, port);
663
568
}
664
569
665
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
666
571
if(tcp_sd < 0){
667
int e = errno;
668
perror_plus("socket");
669
errno = e;
572
perror("socket");
573
retval = -1;
670
574
goto mandos_end;
671
575
}
672
576
673
577
if(quit_now){
674
errno = EINTR;
675
578
goto mandos_end;
676
579
}
677
580
684
587
ret = inet_pton(af, ip, &to.in.sin_addr);
685
588
}
686
589
if(ret < 0 ){
687
int e = errno;
688
perror_plus("inet_pton");
689
errno = e;
590
perror("inet_pton");
591
retval = -1;
690
592
goto mandos_end;
691
593
}
692
594
if(ret == 0){
693
int e = errno;
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
695
errno = e;
595
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
696
597
goto mandos_end;
697
598
}
698
599
if(af == AF_INET6){
702
603
703
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
606
-Wunreachable-code*/
706
607
if(if_index == AVAHI_IF_UNSPEC){
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
709
errno = EINVAL;
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
710
611
goto mandos_end;
711
612
}
712
613
/* Set the network interface number as scope */
719
620
}
720
621
721
622
if(quit_now){
722
errno = EINTR;
723
623
goto mandos_end;
724
624
}
725
625
727
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
728
628
char interface[IF_NAMESIZE];
729
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
perror_plus("if_indextoname");
630
perror("if_indextoname");
731
631
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
734
634
}
735
635
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
738
638
}
739
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
747
647
sizeof(addrstr));
748
648
}
749
649
if(pcret == NULL){
750
perror_plus("inet_ntop");
650
perror("inet_ntop");
751
651
} else {
752
652
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
653
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
654
}
755
655
}
756
656
}
757
657
758
658
if(quit_now){
759
errno = EINTR;
760
659
goto mandos_end;
761
660
}
762
661
766
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
666
}
768
667
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
668
perror("connect");
669
retval = -1;
774
670
goto mandos_end;
775
671
}
776
672
777
673
if(quit_now){
778
errno = EINTR;
779
674
goto mandos_end;
780
675
}
781
676
784
679
while(true){
785
680
size_t out_size = strlen(out);
786
681
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
787
out_size - written));
682
out_size - written));
788
683
if(ret == -1){
789
int e = errno;
790
perror_plus("write");
791
errno = e;
684
perror("write");
685
retval = -1;
792
686
goto mandos_end;
793
687
}
794
688
written += (size_t)ret;
804
698
}
805
699
806
700
if(quit_now){
807
errno = EINTR;
808
701
goto mandos_end;
809
702
}
810
703
}
811
704
812
705
if(debug){
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
814
707
}
815
708
816
709
if(quit_now){
817
errno = EINTR;
818
710
goto mandos_end;
819
711
}
820
712
821
/* Spurious warning from -Wint-to-pointer-cast */
822
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
823
714
824
715
if(quit_now){
825
errno = EINTR;
826
716
goto mandos_end;
827
717
}
828
718
829
719
do {
830
720
ret = gnutls_handshake(session);
831
721
if(quit_now){
832
errno = EINTR;
833
722
goto mandos_end;
834
723
}
835
724
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
836
725
837
726
if(ret != GNUTLS_E_SUCCESS){
838
727
if(debug){
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
728
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
840
729
gnutls_perror(ret);
841
730
}
842
errno = EPROTO;
731
retval = -1;
843
732
goto mandos_end;
844
733
}
845
734
846
735
/* Read OpenPGP packet that contains the wanted password */
847
736
848
737
if(debug){
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
739
ip);
851
740
}
852
741
853
742
while(true){
854
743
855
744
if(quit_now){
856
errno = EINTR;
857
745
goto mandos_end;
858
746
}
859
747
860
748
buffer_capacity = incbuffer(&buffer, buffer_length,
861
buffer_capacity);
749
buffer_capacity);
862
750
if(buffer_capacity == 0){
863
int e = errno;
864
perror_plus("incbuffer");
865
errno = e;
751
perror("incbuffer");
752
retval = -1;
866
753
goto mandos_end;
867
754
}
868
755
869
756
if(quit_now){
870
errno = EINTR;
871
757
goto mandos_end;
872
758
}
873
759
886
772
ret = gnutls_handshake(session);
887
773
888
774
if(quit_now){
889
errno = EINTR;
890
775
goto mandos_end;
891
776
}
892
777
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
893
778
if(ret < 0){
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
896
780
gnutls_perror(ret);
897
errno = EPROTO;
781
retval = -1;
898
782
goto mandos_end;
899
783
}
900
784
break;
901
785
default:
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" 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;
904
789
gnutls_bye(session, GNUTLS_SHUT_RDWR);
905
errno = EIO;
906
790
goto mandos_end;
907
791
}
908
792
} else {
911
795
}
912
796
913
797
if(debug){
914
fprintf_plus(stderr, "Closing TLS session\n");
915
}
916
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
do {
923
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
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
}
929
810
930
811
if(buffer_length > 0){
931
812
ssize_t decrypted_buffer_size;
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
814
buffer_length,
933
815
&decrypted_buffer);
934
816
if(decrypted_buffer_size >= 0){
935
817
936
818
written = 0;
937
819
while(written < (size_t) decrypted_buffer_size){
938
820
if(quit_now){
939
errno = EINTR;
940
821
goto mandos_end;
941
822
}
942
823
944
825
(size_t)decrypted_buffer_size - written,
945
826
stdout);
946
827
if(ret == 0 and ferror(stdout)){
947
int e = errno;
948
828
if(debug){
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
829
fprintf(stderr, "Error writing encrypted data: %s\n",
830
strerror(errno));
951
831
}
952
errno = e;
953
goto mandos_end;
832
retval = -1;
833
break;
954
834
}
955
835
written += (size_t)ret;
956
836
}
957
retval = 0;
837
free(decrypted_buffer);
838
} else {
839
retval = -1;
958
840
}
841
} else {
842
retval = -1;
959
843
}
960
844
961
845
/* Shutdown procedure */
962
846
963
847
mandos_end:
964
{
965
int e = errno;
966
free(decrypted_buffer);
967
free(buffer);
968
if(tcp_sd >= 0){
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
970
}
971
if(ret == -1){
972
if(e == 0){
973
e = errno;
974
}
975
perror_plus("close");
976
}
977
gnutls_deinit(session);
978
errno = e;
979
if(quit_now){
980
errno = EINTR;
981
retval = -1;
982
}
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;
983
858
}
984
859
return retval;
985
860
}
1010
885
switch(event){
1011
886
default:
1012
887
case AVAHI_RESOLVER_FAILURE:
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
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)));
1017
891
break;
1018
892
1019
893
case AVAHI_RESOLVER_FOUND:
1021
895
char ip[AVAHI_ADDRESS_STR_MAX];
1022
896
avahi_address_snprint(ip, sizeof(ip), address);
1023
897
if(debug){
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
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);
1027
901
}
1028
902
int ret = start_mandos_communication(ip, port, interface,
1029
903
avahi_proto_to_af(proto));
1030
904
if(ret == 0){
1031
905
avahi_simple_poll_quit(mc.simple_poll);
1032
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1035
906
}
1036
907
}
1037
908
}
1061
932
default:
1062
933
case AVAHI_BROWSER_FAILURE:
1063
934
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
1066
937
avahi_simple_poll_quit(mc.simple_poll);
1067
938
return;
1068
939
1075
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
947
name, type, domain, protocol, 0,
1077
948
resolve_callback, NULL) == NULL)
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
1081
951
break;
1082
952
1083
953
case AVAHI_BROWSER_REMOVE:
1086
956
case AVAHI_BROWSER_ALL_FOR_NOW:
1087
957
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1088
958
if(debug){
1089
fprintf_plus(stderr, "No Mandos server found, still"
1090
" searching...\n");
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1091
960
}
1092
961
break;
1093
962
}
1094
963
}
1095
964
1096
/* Signal handler that stops main loop after SIGTERM */
965
/* stop main loop after sigterm has been called */
1097
966
static void handle_sigterm(int sig){
1098
967
if(quit_now){
1099
968
return;
1101
970
quit_now = 1;
1102
971
signal_received = sig;
1103
972
int old_errno = errno;
1104
/* set main loop to exit */
1105
973
if(mc.simple_poll != NULL){
1106
974
avahi_simple_poll_quit(mc.simple_poll);
1107
975
}
1108
976
errno = old_errno;
1109
977
}
1110
978
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
int ret;
1113
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
if(s < 0){
1116
perror_plus("socket");
1117
return false;
1118
}
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
if(ret == -1){
1122
if(debug){
1123
perror_plus("ioctl SIOCGIFFLAGS");
1124
}
1125
return false;
1126
}
1127
return true;
1128
}
1129
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1132
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1134
if(debug){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1136
ifname);
1137
}
1138
return false;
1139
}
1140
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1142
if(debug){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1145
}
1146
return true;
1147
}
1148
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1150
if(debug){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1153
}
1154
return false;
1155
}
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1158
if(debug){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1160
ifname);
1161
}
1162
return false;
1163
}
1164
1165
/* Accept this device */
1166
if(debug){
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1168
}
1169
return true;
1170
}
1171
1172
/*
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1176
*/
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1179
return 0;
1180
}
1181
1182
struct ifreq ifr;
1183
if(not get_flags(if_entry->d_name, &ifr)){
1184
if(debug){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1187
}
1188
return 0;
1189
}
1190
1191
if(not good_flags(if_entry->d_name, &ifr)){
1192
return 0;
1193
}
1194
return 1;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1253
int ret;
1254
size_t sret;
1255
struct stat st;
1256
1257
if((direntry->d_name)[0] == '\0'){
1258
/* Empty name? */
1259
return 0;
1260
}
1261
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1264
"0123456789"
1265
"_-");
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1268
if(debug){
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1270
direntry->d_name);
1271
}
1272
return 0;
1273
}
1274
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1283
if(ret == -1){
1284
if(debug){
1285
perror_plus("Could not stat hook");
1286
}
1287
return 0;
1288
}
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1291
if(debug){
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1293
direntry->d_name);
1294
}
1295
return 0;
1296
}
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1299
if(debug){
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1301
direntry->d_name);
1302
}
1303
return 0;
1304
}
1305
if(debug){
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1307
direntry->d_name);
1308
}
1309
return 1;
1310
}
1311
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1313
int ret;
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1317
1318
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1321
fprintf_plus(stderr, "Wait until first server is found."
1322
" No timeout!\n");
1323
}
1324
ret = avahi_simple_poll_iterate(s, -1);
1325
} else {
1326
if (debug){
1327
fprintf_plus(stderr, "Check current_server if we should run"
1328
" it, or wait\n");
1329
}
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1332
if(ret == -1){
1333
perror_plus("clock_gettime");
1334
return -1;
1335
}
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1349
if (debug){
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
block_time);
1352
}
1353
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1359
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1361
return 0;
1362
}
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1365
if(ret == -1){
1366
perror_plus("clock_gettime");
1367
return -1;
1368
}
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1372
}
1373
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
}
1376
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1379
}
1380
}
1381
}
1382
}
1383
1384
bool run_network_hooks(const char *mode, const char *interface,
1385
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1391
if(numhooks == -1){
1392
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1400
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1438
if(ret == -1){
1439
perror_plus("setenv");
1440
_exit(EX_OSERR);
1441
}
1442
ret = setenv("DEVICE", interface, 1);
1443
if(ret == -1){
1444
perror_plus("setenv");
1445
_exit(EX_OSERR);
1446
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1448
if(ret == -1){
1449
perror_plus("setenv");
1450
_exit(EX_OSERR);
1451
}
1452
ret = setenv("MODE", mode, 1);
1453
if(ret == -1){
1454
perror_plus("setenv");
1455
_exit(EX_OSERR);
1456
}
1457
char *delaystring;
1458
ret = asprintf(&delaystring, "%f", delay);
1459
if(ret == -1){
1460
perror_plus("asprintf");
1461
_exit(EX_OSERR);
1462
}
1463
ret = setenv("DELAY", delaystring, 1);
1464
if(ret == -1){
1465
free(delaystring);
1466
perror_plus("setenv");
1467
_exit(EX_OSERR);
1468
}
1469
free(delaystring);
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1472
} else {
1473
int status;
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1476
free(fullname);
1477
continue;
1478
}
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1484
free(fullname);
1485
continue;
1486
}
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1490
WTERMSIG(status));
1491
free(fullname);
1492
continue;
1493
} else {
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1496
free(fullname);
1497
continue;
1498
}
1499
}
1500
free(fullname);
1501
if(debug){
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1503
direntry->d_name);
1504
}
1505
}
1506
close(devnull);
1507
}
1508
return true;
1509
}
1510
1511
979
int main(int argc, char *argv[]){
1512
980
AvahiSServiceBrowser *sb = NULL;
1513
981
int error;
1515
983
intmax_t tmpmax;
1516
984
char *tmp;
1517
985
int exitcode = EXIT_SUCCESS;
1518
const char *interface = "";
986
const char *interface = "eth0";
1519
987
struct ifreq network;
1520
988
int sd = -1;
1521
989
bool take_down_interface = false;
1522
990
uid_t uid;
1523
991
gid_t gid;
992
char *connect_to = NULL;
1524
993
char tempdir[] = "/tmp/mandosXXXXXX";
1525
994
bool tempdir_created = false;
1526
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1530
999
bool gnutls_initialized = false;
1531
1000
bool gpgme_initialized = false;
1532
1001
float delay = 2.5f;
1533
double retry_interval = 10; /* 10s between trying a server and
1534
retrying the same server again */
1535
1002
1536
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1003
struct sigaction old_sigterm_action;
1537
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1538
1005
1539
1006
uid = getuid();
1543
1010
errno = 0;
1544
1011
ret = setgid(gid);
1545
1012
if(ret == -1){
1546
perror_plus("setgid");
1013
perror("setgid");
1547
1014
}
1548
1015
1549
1016
/* Lower user privileges (temporarily) */
1550
1017
errno = 0;
1551
1018
ret = seteuid(uid);
1552
1019
if(ret == -1){
1553
perror_plus("seteuid");
1020
perror("seteuid");
1554
1021
}
1555
1022
1556
1023
if(quit_now){
1591
1058
.arg = "SECONDS",
1592
1059
.doc = "Maximum delay to wait for interface startup",
1593
1060
.group = 2 },
1594
{ .name = "retry", .key = 132,
1595
.arg = "SECONDS",
1596
.doc = "Retry interval used when denied by the mandos server",
1597
.group = 2 },
1598
{ .name = "network-hook-dir", .key = 133,
1599
.arg = "DIR",
1600
.doc = "Directory where network hooks are located",
1601
.group = 2 },
1602
/*
1603
* These reproduce what we would get without ARGP_NO_HELP
1604
*/
1605
{ .name = "help", .key = '?',
1606
.doc = "Give this help list", .group = -1 },
1607
{ .name = "usage", .key = -3,
1608
.doc = "Give a short usage message", .group = -1 },
1609
{ .name = "version", .key = 'V',
1610
.doc = "Print program version", .group = -1 },
1611
1061
{ .name = NULL }
1612
1062
};
1613
1063
1614
1064
error_t parse_opt(int key, char *arg,
1615
1065
struct argp_state *state){
1616
errno = 0;
1617
1066
switch(key){
1618
1067
case 128: /* --debug */
1619
1068
debug = true;
1635
1084
tmpmax = strtoimax(arg, &tmp, 10);
1636
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
1637
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1638
argp_error(state, "Bad number of DH bits");
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
1639
1089
}
1640
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1641
1091
break;
1646
1096
errno = 0;
1647
1097
delay = strtof(arg, &tmp);
1648
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
1649
argp_error(state, "Bad delay");
1650
}
1651
case 132: /* --retry */
1652
errno = 0;
1653
retry_interval = strtod(arg, &tmp);
1654
if(errno != 0 or tmp == arg or *tmp != '\0'
1655
or (retry_interval * 1000) > INT_MAX
1656
or retry_interval < 0){
1657
argp_error(state, "Bad retry interval");
1658
}
1659
break;
1660
case 133: /* --network-hook-dir */
1661
hookdir = arg;
1662
break;
1663
/*
1664
* These reproduce what we would get without ARGP_NO_HELP
1665
*/
1666
case '?': /* --help */
1667
argp_state_help(state, state->out_stream,
1668
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1669
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1670
case -3: /* --usage */
1671
argp_state_help(state, state->out_stream,
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1673
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1677
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:
1678
1106
break;
1679
1107
default:
1680
1108
return ARGP_ERR_UNKNOWN;
1681
1109
}
1682
return errno;
1110
return 0;
1683
1111
}
1684
1112
1685
1113
struct argp argp = { .options = options, .parser = parse_opt,
1686
1114
.args_doc = "",
1687
1115
.doc = "Mandos client -- Get and decrypt"
1688
1116
" passwords from a Mandos server" };
1689
ret = argp_parse(&argp, argc, argv,
1690
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1691
switch(ret){
1692
case 0:
1693
break;
1694
case ENOMEM:
1695
default:
1696
errno = ret;
1697
perror_plus("argp_parse");
1698
exitcode = EX_OSERR;
1699
goto end;
1700
case EINVAL:
1701
exitcode = EX_USAGE;
1702
goto end;
1703
}
1704
}
1705
1706
{
1707
/* Work around Debian bug #633582:
1708
<http://bugs.debian.org/633582> */
1709
1710
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
1715
} else {
1716
struct stat st;
1717
1718
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1719
int seckey_fd = open(seckey, O_RDONLY);
1720
if(seckey_fd == -1){
1721
perror_plus("open");
1722
} else {
1723
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1724
if(ret == -1){
1725
perror_plus("fstat");
1726
} else {
1727
if(S_ISREG(st.st_mode)
1728
and st.st_uid == 0 and st.st_gid == 0){
1729
ret = fchown(seckey_fd, uid, gid);
1730
if(ret == -1){
1731
perror_plus("fchown");
1732
}
1733
}
1734
}
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
1736
}
1737
}
1738
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1740
int pubkey_fd = open(pubkey, O_RDONLY);
1741
if(pubkey_fd == -1){
1742
perror_plus("open");
1743
} else {
1744
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1745
if(ret == -1){
1746
perror_plus("fstat");
1747
} else {
1748
if(S_ISREG(st.st_mode)
1749
and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1751
if(ret == -1){
1752
perror_plus("fchown");
1753
}
1754
}
1755
}
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
1760
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
1765
}
1766
}
1767
}
1768
1769
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1771
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
}
1772
1123
}
1773
1124
1774
1125
if(not debug){
1775
1126
avahi_set_log_function(empty_log);
1776
1127
}
1777
1128
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1794
}
1795
if(interface == NULL){
1796
perror_plus("malloc");
1797
free(direntries);
1798
exitcode = EXIT_FAILURE;
1799
goto end;
1800
}
1801
free(direntries);
1802
} else {
1803
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1806
goto end;
1807
}
1808
}
1809
1810
1129
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1811
1130
from the signal handler */
1812
1131
/* Initialize the pseudo-RNG for Avahi */
1813
1132
srand((unsigned int) time(NULL));
1814
1133
mc.simple_poll = avahi_simple_poll_new();
1815
1134
if(mc.simple_poll == NULL){
1816
fprintf_plus(stderr,
1817
"Avahi: Failed to create simple poll object.\n");
1818
exitcode = EX_UNAVAILABLE;
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
1819
1137
goto end;
1820
1138
}
1821
1139
1822
1140
sigemptyset(&sigterm_action.sa_mask);
1823
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1824
1142
if(ret == -1){
1825
perror_plus("sigaddset");
1826
exitcode = EX_OSERR;
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
1827
1145
goto end;
1828
1146
}
1829
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1830
1148
if(ret == -1){
1831
perror_plus("sigaddset");
1832
exitcode = EX_OSERR;
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
1833
1151
goto end;
1834
1152
}
1835
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1836
1154
if(ret == -1){
1837
perror_plus("sigaddset");
1838
exitcode = EX_OSERR;
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
1839
1157
goto end;
1840
1158
}
1841
1159
/* Need to check if the handler is SIG_IGN before handling:
1844
1162
*/
1845
1163
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1846
1164
if(ret == -1){
1847
perror_plus("sigaction");
1848
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1849
1167
}
1850
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1851
1169
ret = sigaction(SIGINT, &sigterm_action, NULL);
1852
1170
if(ret == -1){
1853
perror_plus("sigaction");
1854
exitcode = EX_OSERR;
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1855
1173
goto end;
1856
1174
}
1857
1175
}
1858
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1859
1177
if(ret == -1){
1860
perror_plus("sigaction");
1861
return EX_OSERR;
1178
perror("sigaction");
1179
return EXIT_FAILURE;
1862
1180
}
1863
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
1864
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1865
1183
if(ret == -1){
1866
perror_plus("sigaction");
1867
exitcode = EX_OSERR;
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
1868
1186
goto end;
1869
1187
}
1870
1188
}
1871
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1872
1190
if(ret == -1){
1873
perror_plus("sigaction");
1874
return EX_OSERR;
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1875
1193
}
1876
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1877
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1878
1196
if(ret == -1){
1879
perror_plus("sigaction");
1880
exitcode = EX_OSERR;
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1881
1199
goto end;
1882
1200
}
1883
1201
}
1884
1202
1885
1203
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1204
if(interface[0] != '\0'){
1887
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
1206
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1891
1209
goto end;
1892
1210
}
1893
1211
1899
1217
errno = 0;
1900
1218
ret = seteuid(0);
1901
1219
if(ret == -1){
1902
perror_plus("seteuid");
1220
perror("seteuid");
1903
1221
}
1904
1222
1905
1223
#ifdef __linux__
1906
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1225
messages to mess up the prompt */
1908
1226
ret = klogctl(8, NULL, 5);
1909
1227
bool restore_loglevel = true;
1910
1228
if(ret == -1){
1911
1229
restore_loglevel = false;
1912
perror_plus("klogctl");
1230
perror("klogctl");
1913
1231
}
1914
1232
#endif /* __linux__ */
1915
1233
1916
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
1235
if(sd < 0){
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1920
1238
#ifdef __linux__
1921
1239
if(restore_loglevel){
1922
1240
ret = klogctl(7, NULL, 0);
1923
1241
if(ret == -1){
1924
perror_plus("klogctl");
1242
perror("klogctl");
1925
1243
}
1926
1244
}
1927
1245
#endif /* __linux__ */
1929
1247
errno = 0;
1930
1248
ret = seteuid(uid);
1931
1249
if(ret == -1){
1932
perror_plus("seteuid");
1250
perror("seteuid");
1933
1251
}
1934
1252
goto end;
1935
1253
}
1936
1254
strcpy(network.ifr_name, interface);
1937
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
1256
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1257
perror("ioctl SIOCGIFFLAGS");
1940
1258
#ifdef __linux__
1941
1259
if(restore_loglevel){
1942
1260
ret = klogctl(7, NULL, 0);
1943
1261
if(ret == -1){
1944
perror_plus("klogctl");
1262
perror("klogctl");
1945
1263
}
1946
1264
}
1947
1265
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1266
exitcode = EXIT_FAILURE;
1949
1267
/* Lower privileges */
1950
1268
errno = 0;
1951
1269
ret = seteuid(uid);
1952
1270
if(ret == -1){
1953
perror_plus("seteuid");
1271
perror("seteuid");
1954
1272
}
1955
1273
goto end;
1956
1274
}
1960
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
1279
if(ret == -1){
1962
1280
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1965
1283
#ifdef __linux__
1966
1284
if(restore_loglevel){
1967
1285
ret = klogctl(7, NULL, 0);
1968
1286
if(ret == -1){
1969
perror_plus("klogctl");
1287
perror("klogctl");
1970
1288
}
1971
1289
}
1972
1290
#endif /* __linux__ */
1974
1292
errno = 0;
1975
1293
ret = seteuid(uid);
1976
1294
if(ret == -1){
1977
perror_plus("seteuid");
1295
perror("seteuid");
1978
1296
}
1979
1297
goto end;
1980
1298
}
1981
1299
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1300
/* sleep checking until interface is running */
1984
1301
for(int i=0; i < delay * 4; i++){
1985
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
1303
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1304
perror("ioctl SIOCGIFFLAGS");
1988
1305
} else if(network.ifr_flags & IFF_RUNNING){
1989
1306
break;
1990
1307
}
1991
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
1309
ret = nanosleep(&sleeptime, NULL);
1993
1310
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1311
perror("nanosleep");
1995
1312
}
1996
1313
}
1997
1314
if(not take_down_interface){
1998
1315
/* We won't need the socket anymore */
1999
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
1317
if(ret == -1){
2001
perror_plus("close");
1318
perror("close");
2002
1319
}
2003
1320
}
2004
1321
#ifdef __linux__
2006
1323
/* Restores kernel loglevel to default */
2007
1324
ret = klogctl(7, NULL, 0);
2008
1325
if(ret == -1){
2009
perror_plus("klogctl");
1326
perror("klogctl");
2010
1327
}
2011
1328
}
2012
1329
#endif /* __linux__ */
2013
1330
/* Lower privileges */
2014
1331
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
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
}
2019
1344
}
2020
1345
}
2021
1346
2025
1350
2026
1351
ret = init_gnutls_global(pubkey, seckey);
2027
1352
if(ret == -1){
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
2029
exitcode = EX_UNAVAILABLE;
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
2030
1355
goto end;
2031
1356
} else {
2032
1357
gnutls_initialized = true;
2036
1361
goto end;
2037
1362
}
2038
1363
1364
tempdir_created = true;
2039
1365
if(mkdtemp(tempdir) == NULL){
2040
perror_plus("mkdtemp");
1366
tempdir_created = false;
1367
perror("mkdtemp");
2041
1368
goto end;
2042
1369
}
2043
tempdir_created = true;
2044
1370
2045
1371
if(quit_now){
2046
1372
goto end;
2047
1373
}
2048
1374
2049
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
2050
fprintf_plus(stderr, "init_gpgme failed\n");
2051
exitcode = EX_UNAVAILABLE;
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
2052
1378
goto end;
2053
1379
} else {
2054
1380
gpgme_initialized = true;
2063
1389
/* (Mainly meant for debugging) */
2064
1390
char *address = strrchr(connect_to, ':');
2065
1391
if(address == NULL){
2066
fprintf_plus(stderr, "No colon in address\n");
2067
exitcode = EX_USAGE;
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
2068
1394
goto end;
2069
1395
}
2070
1396
2077
1403
tmpmax = strtoimax(address+1, &tmp, 10);
2078
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2079
1405
or tmpmax != (uint16_t)tmpmax){
2080
fprintf_plus(stderr, "Bad port number\n");
2081
exitcode = EX_USAGE;
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
2082
1408
goto end;
2083
1409
}
2084
1410
2088
1414
2089
1415
port = (uint16_t)tmpmax;
2090
1416
*address = '\0';
1417
address = connect_to;
2091
1418
/* Colon in address indicates IPv6 */
2092
1419
int af;
2093
if(strchr(connect_to, ':') != NULL){
1420
if(strchr(address, ':') != NULL){
2094
1421
af = AF_INET6;
2095
/* Accept [] around IPv6 address - see RFC 5952 */
2096
if(connect_to[0] == '[' and address[-1] == ']')
2097
{
2098
connect_to++;
2099
address[-1] = '\0';
2100
}
2101
1422
} else {
2102
1423
af = AF_INET;
2103
1424
}
2104
address = connect_to;
2105
1425
2106
1426
if(quit_now){
2107
1427
goto end;
2108
1428
}
2109
1429
2110
while(not quit_now){
2111
ret = start_mandos_communication(address, port, if_index, af);
2112
if(quit_now or ret == 0){
2113
break;
2114
}
2115
if(debug){
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2117
(int)retry_interval);
2118
}
2119
sleep((int)retry_interval);
2120
}
2121
2122
if (not quit_now){
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
2123
1434
exitcode = EXIT_SUCCESS;
2124
1435
}
2125
2126
1436
goto end;
2127
1437
}
2128
1438
2150
1460
2151
1461
/* Check if creating the Avahi server object succeeded */
2152
1462
if(mc.server == NULL){
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2154
avahi_strerror(error));
2155
exitcode = EX_UNAVAILABLE;
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
2156
1466
goto end;
2157
1467
}
2158
1468
2165
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2166
1476
NULL, 0, browse_callback, NULL);
2167
1477
if(sb == NULL){
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2169
avahi_strerror(avahi_server_errno(mc.server)));
2170
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;
2171
1481
goto end;
2172
1482
}
2173
1483
2178
1488
/* Run the main loop */
2179
1489
2180
1490
if(debug){
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
2182
}
2183
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2186
if(debug){
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2189
}
1491
fprintf(stderr, "Starting Avahi loop search\n");
1492
}
1493
1494
avahi_simple_poll_loop(mc.simple_poll);
2190
1495
2191
1496
end:
2192
1497
2193
1498
if(debug){
2194
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1499
fprintf(stderr, "%s exiting\n", argv[0]);
2195
1500
}
2196
1501
2197
1502
/* Cleanup things */
2214
1519
gpgme_release(mc.ctx);
2215
1520
}
2216
1521
2217
/* Cleans up the circular linked list of Mandos servers the client
2218
has seen */
2219
if(mc.current_server != NULL){
2220
mc.current_server->prev->next = NULL;
2221
while(mc.current_server != NULL){
2222
server *next = mc.current_server->next;
2223
free(mc.current_server);
2224
mc.current_server = next;
2225
}
2226
}
2227
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
2232
{
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
2233
1525
errno = 0;
2234
1526
ret = seteuid(0);
2235
1527
if(ret == -1){
2236
perror_plus("seteuid");
1528
perror("seteuid");
2237
1529
}
2238
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
1530
if(geteuid() == 0){
2241
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
1532
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
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 */
2246
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
1537
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1538
perror("ioctl SIOCSIFFLAGS");
2249
1539
}
2250
1540
}
2251
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
1542
if(ret == -1){
2253
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");
2254
1550
}
2255
1551
}
2256
1552
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2263
1553
2264
/* Removes the GPGME temp directory and all files inside */
1554
/* Removes the temp directory used by GPGME */
2265
1555
if(tempdir_created){
2266
struct dirent **direntries = NULL;
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
alphasort);
2270
if (numentries > 0){
2271
for(int i = 0; i < numentries; i++){
2272
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
}
2273
1576
char *fullname = NULL;
2274
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
2275
1578
direntry->d_name);
2276
1579
if(ret < 0){
2277
perror_plus("asprintf");
1580
perror("asprintf");
2278
1581
continue;
2279
1582
}
2280
1583
ret = remove(fullname);
2281
1584
if(ret == -1){
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2283
strerror(errno));
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
2284
1587
}
2285
1588
free(fullname);
2286
1589
}
2287
}
2288
2289
/* need to clean even if 0 because man page doesn't specify */
2290
free(direntries);
2291
if (numentries == -1){
2292
perror_plus("scandir");
1590
closedir(d);
2293
1591
}
2294
1592
ret = rmdir(tempdir);
2295
1593
if(ret == -1 and errno != ENOENT){
2296
perror_plus("rmdir");
1594
perror("rmdir");
2297
1595
}
2298
1596
}
2299
1597
2300
1598
if(quit_now){
2301
1599
sigemptyset(&old_sigterm_action.sa_mask);
2302
1600
old_sigterm_action.sa_handler = SIG_DFL;
2303
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2304
&old_sigterm_action,
2305
NULL));
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2306
1602
if(ret == -1){
2307
perror_plus("sigaction");
2308
}
2309
do {
2310
ret = raise(signal_received);
2311
} while(ret != 0 and errno == EINTR);
2312
if(ret != 0){
2313
perror_plus("raise");
2314
abort();
2315
}
2316
TEMP_FAILURE_RETRY(pause());
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
2317
1606
}
2318
1607
2319
1608
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0