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237.2.95
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-04-14 14:56:46 UTC
- mto: (24.1.138 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-20090414145646-i6x4knw2f6cde3td
* debian/mandos-client.README.Debian: Added text about non-usability
of pseudo-network interfaces.
of pseudo-network interfaces.
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
72
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
81
80
argp_parse(), ARGP_KEY_ARG,
82
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
91
85
92
86
#ifdef __linux__
93
87
#include <sys/klog.h> /* klogctl() */
111
105
init_gnutls_session(),
112
106
GNUTLS_* */
113
107
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
116
110
117
111
/* GPGME */
118
112
#include <gpgme.h> /* All GPGME types, constants and
126
120
#define PATHDIR "/conf/conf.d/mandos"
127
121
#define SECKEY "seckey.txt"
128
122
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
123
131
124
bool debug = false;
132
125
static const char mandos_protocol_version[] = "1";
133
126
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
uid_t uid = 65534;
139
gid_t gid = 65534;
140
141
/* Doubly linked list that need to be circularly linked when used */
142
typedef struct server{
143
const char *ip;
144
uint16_t port;
145
AvahiIfIndex if_index;
146
int af;
147
struct timespec last_seen;
148
struct server *next;
149
struct server *prev;
150
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
151
128
152
129
/* Used for passing in values through the Avahi callback functions */
153
130
typedef struct {
158
135
gnutls_dh_params_t dh_params;
159
136
const char *priority;
160
137
gpgme_ctx_t ctx;
161
server *current_server;
162
138
} mandos_context;
163
139
164
140
/* global context so signal handler can reach it*/
165
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
142
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
169
170
sig_atomic_t quit_now = 0;
171
int signal_received = 0;
172
173
/* Function to use when printing errors */
174
void perror_plus(const char *print_text){
175
int e = errno;
176
fprintf(stderr, "Mandos plugin %s: ",
177
program_invocation_short_name);
178
errno = e;
179
perror(print_text);
180
}
181
182
__attribute__((format (gnu_printf, 2, 3)))
183
int fprintf_plus(FILE *stream, const char *format, ...){
184
va_list ap;
185
va_start (ap, format);
186
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
188
program_invocation_short_name));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
191
144
192
145
/*
193
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
148
* "buffer_length" is how much is already used.
196
149
*/
197
150
size_t incbuffer(char **buffer, size_t buffer_length,
198
size_t buffer_capacity){
151
size_t buffer_capacity){
199
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
200
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
154
if(buffer == NULL){
206
159
return buffer_capacity;
207
160
}
208
161
209
/* Add server to set of servers to retry periodically */
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
212
int ret;
213
server *new_server = malloc(sizeof(server));
214
if(new_server == NULL){
215
perror_plus("malloc");
216
return false;
217
}
218
*new_server = (server){ .ip = strdup(ip),
219
.port = port,
220
.if_index = if_index,
221
.af = af };
222
if(new_server->ip == NULL){
223
perror_plus("strdup");
224
return false;
225
}
226
/* Special case of first server */
227
if (mc.current_server == NULL){
228
new_server->next = new_server;
229
new_server->prev = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
232
} else {
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
235
new_server->prev->next = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
return true;
244
}
245
246
162
/*
247
163
* Initialize GPGME.
248
164
*/
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
251
168
gpgme_error_t rc;
252
169
gpgme_engine_info_t engine_info;
253
170
256
173
* Helper function to insert pub and seckey to the engine keyring.
257
174
*/
258
175
bool import_key(const char *filename){
259
int ret;
260
176
int fd;
261
177
gpgme_data_t pgp_data;
262
178
263
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
180
if(fd == -1){
265
perror_plus("open");
181
perror("open");
266
182
return false;
267
183
}
268
184
269
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
186
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
273
189
return false;
274
190
}
275
191
276
192
rc = gpgme_op_import(mc.ctx, pgp_data);
277
193
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
280
196
return false;
281
197
}
282
198
283
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
284
200
if(ret == -1){
285
perror_plus("close");
201
perror("close");
286
202
}
287
203
gpgme_data_release(pgp_data);
288
204
return true;
289
205
}
290
206
291
207
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
293
209
}
294
210
295
211
/* Init GPGME */
296
212
gpgme_check_version(NULL);
297
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
214
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
301
217
return false;
302
218
}
303
219
304
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
305
221
rc = gpgme_get_engine_info(&engine_info);
306
222
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
309
225
return false;
310
226
}
311
227
while(engine_info != NULL){
317
233
engine_info = engine_info->next;
318
234
}
319
235
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
322
237
return false;
323
238
}
324
239
325
240
/* Create new GPGME "context" */
326
241
rc = gpgme_new(&(mc.ctx));
327
242
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
331
245
return false;
332
246
}
333
247
335
249
return false;
336
250
}
337
251
338
return true;
252
return true;
339
253
}
340
254
341
255
/*
352
266
ssize_t plaintext_length = 0;
353
267
354
268
if(debug){
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
270
}
357
271
358
272
/* Create new GPGME data buffer from memory cryptotext */
359
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
360
274
0);
361
275
if(rc != GPG_ERR_NO_ERROR){
362
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
364
278
return -1;
365
279
}
366
280
367
281
/* Create new empty GPGME data buffer for the plaintext */
368
282
rc = gpgme_data_new(&dh_plain);
369
283
if(rc != GPG_ERR_NO_ERROR){
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
373
286
gpgme_data_release(dh_crypto);
374
287
return -1;
375
288
}
378
291
data buffer */
379
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
293
if(rc != GPG_ERR_NO_ERROR){
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
383
296
plaintext_length = -1;
384
297
if(debug){
385
298
gpgme_decrypt_result_t result;
386
299
result = gpgme_op_decrypt_result(mc.ctx);
387
300
if(result == NULL){
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
302
} else {
390
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
391
result->unsupported_algorithm);
392
fprintf_plus(stderr, "Wrong key usage: %u\n",
393
result->wrong_key_usage);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
394
307
if(result->file_name != NULL){
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
396
309
}
397
310
gpgme_recipient_t recipient;
398
311
recipient = result->recipients;
399
while(recipient != NULL){
400
fprintf_plus(stderr, "Public key algorithm: %s\n",
401
gpgme_pubkey_algo_name
402
(recipient->pubkey_algo));
403
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
404
fprintf_plus(stderr, "Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
407
recipient = recipient->next;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
408
322
}
409
323
}
410
324
}
412
326
}
413
327
414
328
if(debug){
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
330
}
417
331
418
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
334
perror("gpgme_data_seek");
421
335
plaintext_length = -1;
422
336
goto decrypt_end;
423
337
}
425
339
*plaintext = NULL;
426
340
while(true){
427
341
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
342
(size_t)plaintext_length,
343
plaintext_capacity);
430
344
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
434
348
}
435
349
436
350
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
441
355
break;
442
356
}
443
357
if(ret < 0){
444
perror_plus("gpgme_data_read");
358
perror("gpgme_data_read");
445
359
plaintext_length = -1;
446
360
goto decrypt_end;
447
361
}
449
363
}
450
364
451
365
if(debug){
452
fprintf_plus(stderr, "Decrypted password is: ");
366
fprintf(stderr, "Decrypted password is: ");
453
367
for(ssize_t i = 0; i < plaintext_length; i++){
454
368
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
455
369
}
477
391
/* GnuTLS log function callback */
478
392
static void debuggnutls(__attribute__((unused)) int level,
479
393
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
394
fprintf(stderr, "GnuTLS: %s", string);
481
395
}
482
396
483
397
static int init_gnutls_global(const char *pubkeyfilename,
485
399
int ret;
486
400
487
401
if(debug){
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
402
fprintf(stderr, "Initializing GnuTLS\n");
489
403
}
490
404
491
405
ret = gnutls_global_init();
492
406
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
495
409
return -1;
496
410
}
497
411
504
418
}
505
419
506
420
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
421
gnutls_certificate_allocate_credentials(&mc.cred);
508
422
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
511
428
gnutls_global_deinit();
512
429
return -1;
513
430
}
514
431
515
432
if(debug){
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
520
436
}
521
437
522
438
ret = gnutls_certificate_set_openpgp_key_file
523
439
(mc.cred, pubkeyfilename, seckeyfilename,
524
440
GNUTLS_OPENPGP_FMT_BASE64);
525
441
if(ret != GNUTLS_E_SUCCESS){
526
fprintf_plus(stderr,
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
528
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
529
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
530
safer_gnutls_strerror(ret));
442
fprintf(stderr,
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
531
447
goto globalfail;
532
448
}
533
449
534
450
/* GnuTLS server initialization */
535
451
ret = gnutls_dh_params_init(&mc.dh_params);
536
452
if(ret != GNUTLS_E_SUCCESS){
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
540
455
goto globalfail;
541
456
}
542
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
458
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
546
461
goto globalfail;
547
462
}
548
463
561
476
static int init_gnutls_session(gnutls_session_t *session){
562
477
int ret;
563
478
/* GnuTLS session creation */
564
do {
565
ret = gnutls_init(session, GNUTLS_SERVER);
566
if(quit_now){
567
return -1;
568
}
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
479
ret = gnutls_init(session, GNUTLS_SERVER);
570
480
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
574
483
}
575
484
576
485
{
577
486
const char *err;
578
do {
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
if(quit_now){
581
gnutls_deinit(*session);
582
return -1;
583
}
584
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
488
if(ret != GNUTLS_E_SUCCESS){
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
589
492
gnutls_deinit(*session);
590
493
return -1;
591
494
}
592
495
}
593
496
594
do {
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc.cred);
597
if(quit_now){
598
gnutls_deinit(*session);
599
return -1;
600
}
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
602
499
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
safer_gnutls_strerror(ret));
605
502
gnutls_deinit(*session);
606
503
return -1;
607
504
}
608
505
609
506
/* ignore client certificate if any. */
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
611
509
612
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
511
622
520
static int start_mandos_communication(const char *ip, uint16_t port,
623
521
AvahiIfIndex if_index,
624
522
int af){
625
int ret, tcp_sd = -1;
523
int ret, tcp_sd;
626
524
ssize_t sret;
627
525
union {
628
526
struct sockaddr_in in;
629
527
struct sockaddr_in6 in6;
630
528
} to;
631
529
char *buffer = NULL;
632
char *decrypted_buffer = NULL;
530
char *decrypted_buffer;
633
531
size_t buffer_length = 0;
634
532
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
635
534
size_t written;
636
int retval = -1;
535
int retval = 0;
637
536
gnutls_session_t session;
638
537
int pf; /* Protocol family */
639
538
640
errno = 0;
641
642
if(quit_now){
643
errno = EINTR;
644
return -1;
645
}
646
647
539
switch(af){
648
540
case AF_INET6:
649
541
pf = PF_INET6;
652
544
pf = PF_INET;
653
545
break;
654
546
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
656
errno = EINVAL;
547
fprintf(stderr, "Bad address family: %d\n", af);
657
548
return -1;
658
549
}
659
550
663
554
}
664
555
665
556
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
668
559
}
669
560
670
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
562
if(tcp_sd < 0){
672
int e = errno;
673
perror_plus("socket");
674
errno = e;
675
goto mandos_end;
676
}
677
678
if(quit_now){
679
errno = EINTR;
680
goto mandos_end;
563
perror("socket");
564
return -1;
681
565
}
682
566
683
567
memset(&to, 0, sizeof(to));
689
573
ret = inet_pton(af, ip, &to.in.sin_addr);
690
574
}
691
575
if(ret < 0 ){
692
int e = errno;
693
perror_plus("inet_pton");
694
errno = e;
695
goto mandos_end;
576
perror("inet_pton");
577
return -1;
696
578
}
697
579
if(ret == 0){
698
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
700
errno = e;
701
goto mandos_end;
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
702
582
}
703
583
if(af == AF_INET6){
704
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
707
587
708
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
590
-Wunreachable-code*/
711
591
if(if_index == AVAHI_IF_UNSPEC){
712
fprintf_plus(stderr, "An IPv6 link-local address is"
713
" incomplete without a network interface\n");
714
errno = EINVAL;
715
goto mandos_end;
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
716
595
}
717
596
/* Set the network interface number as scope */
718
597
to.in6.sin6_scope_id = (uint32_t)if_index;
723
602
-Wunreachable-code */
724
603
}
725
604
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
730
731
605
if(debug){
732
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
733
607
char interface[IF_NAMESIZE];
734
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
735
perror_plus("if_indextoname");
609
perror("if_indextoname");
736
610
} else {
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
739
613
}
740
614
} else {
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
743
617
}
744
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
745
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
752
626
sizeof(addrstr));
753
627
}
754
628
if(pcret == NULL){
755
perror_plus("inet_ntop");
629
perror("inet_ntop");
756
630
} else {
757
631
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
759
633
}
760
634
}
761
635
}
762
636
763
if(quit_now){
764
errno = EINTR;
765
goto mandos_end;
766
}
767
768
637
if(af == AF_INET6){
769
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
770
639
} else {
771
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
772
641
}
773
642
if(ret < 0){
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
int e = errno;
776
perror_plus("connect");
777
errno = e;
778
}
779
goto mandos_end;
780
}
781
782
if(quit_now){
783
errno = EINTR;
784
goto mandos_end;
643
perror("connect");
644
return -1;
785
645
}
786
646
787
647
const char *out = mandos_protocol_version;
789
649
while(true){
790
650
size_t out_size = strlen(out);
791
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
792
out_size - written));
652
out_size - written));
793
653
if(ret == -1){
794
int e = errno;
795
perror_plus("write");
796
errno = e;
654
perror("write");
655
retval = -1;
797
656
goto mandos_end;
798
657
}
799
658
written += (size_t)ret;
807
666
break;
808
667
}
809
668
}
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
669
}
816
670
817
671
if(debug){
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
819
}
820
821
if(quit_now){
822
errno = EINTR;
823
goto mandos_end;
824
}
825
826
/* This casting via intptr_t is to eliminate warning about casting
827
an int to a pointer type. This is exactly how the GnuTLS Guile
828
function "set-session-transport-fd!" does it. */
829
gnutls_transport_set_ptr(session,
830
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
835
}
836
837
do {
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
677
do{
838
678
ret = gnutls_handshake(session);
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
843
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
844
680
845
681
if(ret != GNUTLS_E_SUCCESS){
846
682
if(debug){
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
848
684
gnutls_perror(ret);
849
685
}
850
errno = EPROTO;
686
retval = -1;
851
687
goto mandos_end;
852
688
}
853
689
854
690
/* Read OpenPGP packet that contains the wanted password */
855
691
856
692
if(debug){
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
859
695
}
860
696
861
697
while(true){
862
863
if(quit_now){
864
errno = EINTR;
865
goto mandos_end;
866
}
867
868
698
buffer_capacity = incbuffer(&buffer, buffer_length,
869
buffer_capacity);
699
buffer_capacity);
870
700
if(buffer_capacity == 0){
871
int e = errno;
872
perror_plus("incbuffer");
873
errno = e;
874
goto mandos_end;
875
}
876
877
if(quit_now){
878
errno = EINTR;
701
perror("incbuffer");
702
retval = -1;
879
703
goto mandos_end;
880
704
}
881
705
890
714
case GNUTLS_E_AGAIN:
891
715
break;
892
716
case GNUTLS_E_REHANDSHAKE:
893
do {
717
do{
894
718
ret = gnutls_handshake(session);
895
896
if(quit_now){
897
errno = EINTR;
898
goto mandos_end;
899
}
900
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
901
720
if(ret < 0){
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
904
722
gnutls_perror(ret);
905
errno = EPROTO;
723
retval = -1;
906
724
goto mandos_end;
907
725
}
908
726
break;
909
727
default:
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
728
fprintf(stderr, "Unknown error while reading data from"
729
" encrypted session with Mandos server\n");
730
retval = -1;
912
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
913
errno = EIO;
914
732
goto mandos_end;
915
733
}
916
734
} else {
919
737
}
920
738
921
739
if(debug){
922
fprintf_plus(stderr, "Closing TLS session\n");
923
}
924
925
if(quit_now){
926
errno = EINTR;
927
goto mandos_end;
928
}
929
930
do {
931
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
932
if(quit_now){
933
errno = EINTR;
934
goto mandos_end;
935
}
936
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
937
744
938
745
if(buffer_length > 0){
939
ssize_t decrypted_buffer_size;
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
941
748
&decrypted_buffer);
942
749
if(decrypted_buffer_size >= 0){
943
944
750
written = 0;
945
751
while(written < (size_t) decrypted_buffer_size){
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
951
752
ret = (int)fwrite(decrypted_buffer + written, 1,
952
753
(size_t)decrypted_buffer_size - written,
953
754
stdout);
954
755
if(ret == 0 and ferror(stdout)){
955
int e = errno;
956
756
if(debug){
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
757
fprintf(stderr, "Error writing encrypted data: %s\n",
758
strerror(errno));
959
759
}
960
errno = e;
961
goto mandos_end;
760
retval = -1;
761
break;
962
762
}
963
763
written += (size_t)ret;
964
764
}
965
retval = 0;
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
966
768
}
769
} else {
770
retval = -1;
967
771
}
968
772
969
773
/* Shutdown procedure */
970
774
971
775
mandos_end:
972
{
973
int e = errno;
974
free(decrypted_buffer);
975
free(buffer);
976
if(tcp_sd >= 0){
977
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
978
}
979
if(ret == -1){
980
if(e == 0){
981
e = errno;
982
}
983
perror_plus("close");
984
}
985
gnutls_deinit(session);
986
errno = e;
987
if(quit_now){
988
errno = EINTR;
989
retval = -1;
990
}
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
991
780
}
781
gnutls_deinit(session);
992
782
return retval;
993
783
}
994
784
1011
801
/* Called whenever a service has been resolved successfully or
1012
802
timed out */
1013
803
1014
if(quit_now){
1015
return;
1016
}
1017
1018
804
switch(event){
1019
805
default:
1020
806
case AVAHI_RESOLVER_FAILURE:
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1023
domain,
1024
avahi_strerror(avahi_server_errno(mc.server)));
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
avahi_strerror(avahi_server_errno(mc.server)));
1025
810
break;
1026
811
1027
812
case AVAHI_RESOLVER_FOUND:
1029
814
char ip[AVAHI_ADDRESS_STR_MAX];
1030
815
avahi_address_snprint(ip, sizeof(ip), address);
1031
816
if(debug){
1032
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
host_name, ip, (intmax_t)interface, port);
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
1035
820
}
1036
821
int ret = start_mandos_communication(ip, port, interface,
1037
822
avahi_proto_to_af(proto));
1038
823
if(ret == 0){
1039
824
avahi_simple_poll_quit(mc.simple_poll);
1040
} else {
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
1046
825
}
1047
826
}
1048
827
}
1064
843
/* Called whenever a new services becomes available on the LAN or
1065
844
is removed from the LAN */
1066
845
1067
if(quit_now){
1068
return;
1069
}
1070
1071
846
switch(event){
1072
847
default:
1073
848
case AVAHI_BROWSER_FAILURE:
1074
849
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
850
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
1077
852
avahi_simple_poll_quit(mc.simple_poll);
1078
853
return;
1079
854
1086
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
862
name, type, domain, protocol, 0,
1088
863
resolve_callback, NULL) == NULL)
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1090
" %s\n", name,
1091
avahi_strerror(avahi_server_errno(mc.server)));
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
name, avahi_strerror(avahi_server_errno(mc.server)));
1092
866
break;
1093
867
1094
868
case AVAHI_BROWSER_REMOVE:
1097
871
case AVAHI_BROWSER_ALL_FOR_NOW:
1098
872
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1099
873
if(debug){
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1102
875
}
1103
876
break;
1104
877
}
1105
878
}
1106
879
1107
/* Signal handler that stops main loop after SIGTERM */
1108
static void handle_sigterm(int sig){
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1109
884
if(quit_now){
1110
885
return;
1111
886
}
1112
887
quit_now = 1;
1113
signal_received = sig;
1114
888
int old_errno = errno;
1115
/* set main loop to exit */
1116
889
if(mc.simple_poll != NULL){
1117
890
avahi_simple_poll_quit(mc.simple_poll);
1118
891
}
1119
892
errno = old_errno;
1120
893
}
1121
894
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1123
int ret;
1124
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1126
if(s < 0){
1127
perror_plus("socket");
1128
return false;
1129
}
1130
strcpy(ifr->ifr_name, ifname);
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1132
if(ret == -1){
1133
if(debug){
1134
perror_plus("ioctl SIOCGIFFLAGS");
1135
}
1136
return false;
1137
}
1138
return true;
1139
}
1140
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1142
1143
/* Reject the loopback device */
1144
if(ifr->ifr_flags & IFF_LOOPBACK){
1145
if(debug){
1146
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1147
ifname);
1148
}
1149
return false;
1150
}
1151
/* Accept point-to-point devices only if connect_to is specified */
1152
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1153
if(debug){
1154
fprintf_plus(stderr, "Accepting point-to-point interface"
1155
" \"%s\"\n", ifname);
1156
}
1157
return true;
1158
}
1159
/* Otherwise, reject non-broadcast-capable devices */
1160
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1161
if(debug){
1162
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1163
" \"%s\"\n", ifname);
1164
}
1165
return false;
1166
}
1167
/* Reject non-ARP interfaces (including dummy interfaces) */
1168
if(ifr->ifr_flags & IFF_NOARP){
1169
if(debug){
1170
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1171
ifname);
1172
}
1173
return false;
1174
}
1175
1176
/* Accept this device */
1177
if(debug){
1178
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1179
}
1180
return true;
1181
}
1182
1183
/*
1184
* This function determines if a directory entry in /sys/class/net
1185
* corresponds to an acceptable network device.
1186
* (This function is passed to scandir(3) as a filter function.)
1187
*/
1188
int good_interface(const struct dirent *if_entry){
1189
if(if_entry->d_name[0] == '.'){
1190
return 0;
1191
}
1192
1193
struct ifreq ifr;
1194
if(not get_flags(if_entry->d_name, &ifr)){
1195
if(debug){
1196
fprintf_plus(stderr, "Failed to get flags for interface "
1197
"\"%s\"\n", if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
if(not good_flags(if_entry->d_name, &ifr)){
1203
return 0;
1204
}
1205
return 1;
1206
}
1207
1208
/*
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
int notdotentries(const struct dirent *direntry){
1252
/* Skip "." and ".." */
1253
if(direntry->d_name[0] == '.'
1254
and (direntry->d_name[1] == '\0'
1255
or (direntry->d_name[1] == '.'
1256
and direntry->d_name[2] == '\0'))){
1257
return 0;
1258
}
1259
return 1;
1260
}
1261
1262
/* Is this directory entry a runnable program? */
1263
int runnable_hook(const struct dirent *direntry){
1264
int ret;
1265
size_t sret;
1266
struct stat st;
1267
1268
if((direntry->d_name)[0] == '\0'){
1269
/* Empty name? */
1270
return 0;
1271
}
1272
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1274
"abcdefghijklmnopqrstuvwxyz"
1275
"0123456789"
1276
"_-");
1277
if((direntry->d_name)[sret] != '\0'){
1278
/* Contains non-allowed characters */
1279
if(debug){
1280
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1281
direntry->d_name);
1282
}
1283
return 0;
1284
}
1285
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1294
if(ret == -1){
1295
if(debug){
1296
perror_plus("Could not stat hook");
1297
}
1298
return 0;
1299
}
1300
if(not (S_ISREG(st.st_mode))){
1301
/* Not a regular file */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1309
/* Not executable */
1310
if(debug){
1311
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1312
direntry->d_name);
1313
}
1314
return 0;
1315
}
1316
if(debug){
1317
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1318
direntry->d_name);
1319
}
1320
return 1;
1321
}
1322
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1324
int ret;
1325
struct timespec now;
1326
struct timespec waited_time;
1327
intmax_t block_time;
1328
1329
while(true){
1330
if(mc.current_server == NULL){
1331
if (debug){
1332
fprintf_plus(stderr, "Wait until first server is found."
1333
" No timeout!\n");
1334
}
1335
ret = avahi_simple_poll_iterate(s, -1);
1336
} else {
1337
if (debug){
1338
fprintf_plus(stderr, "Check current_server if we should run"
1339
" it, or wait\n");
1340
}
1341
/* the current time */
1342
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1343
if(ret == -1){
1344
perror_plus("clock_gettime");
1345
return -1;
1346
}
1347
/* Calculating in ms how long time between now and server
1348
who we visted longest time ago. Now - last seen. */
1349
waited_time.tv_sec = (now.tv_sec
1350
- mc.current_server->last_seen.tv_sec);
1351
waited_time.tv_nsec = (now.tv_nsec
1352
- mc.current_server->last_seen.tv_nsec);
1353
/* total time is 10s/10,000ms.
1354
Converting to s from ms by dividing by 1,000,
1355
and ns to ms by dividing by 1,000,000. */
1356
block_time = ((retry_interval
1357
- ((intmax_t)waited_time.tv_sec * 1000))
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1359
1360
if (debug){
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1362
block_time);
1363
}
1364
1365
if(block_time <= 0){
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1370
if(ret == 0){
1371
avahi_simple_poll_quit(mc.simple_poll);
1372
return 0;
1373
}
1374
ret = clock_gettime(CLOCK_MONOTONIC,
1375
&mc.current_server->last_seen);
1376
if(ret == -1){
1377
perror_plus("clock_gettime");
1378
return -1;
1379
}
1380
mc.current_server = mc.current_server->next;
1381
block_time = 0; /* Call avahi to find new Mandos
1382
servers, but don't block */
1383
}
1384
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
}
1387
if(ret != 0){
1388
if (ret > 0 or errno != EINTR){
1389
return (ret != 1) ? ret : 0;
1390
}
1391
}
1392
}
1393
}
1394
1395
/* Set effective uid to 0, return errno */
1396
int raise_privileges(void){
1397
int old_errno = errno;
1398
int ret_errno = 0;
1399
errno = 0;
1400
if(seteuid(0) == -1){
1401
perror_plus("seteuid");
1402
}
1403
ret_errno = errno;
1404
errno = old_errno;
1405
return ret_errno;
1406
}
1407
1408
/* Set effective and real user ID to 0. Return errno. */
1409
int raise_privileges_permanently(void){
1410
int old_errno = errno;
1411
int ret_errno = raise_privileges();
1412
if(ret_errno != 0){
1413
errno = old_errno;
1414
return ret_errno;
1415
}
1416
errno = 0;
1417
if(setuid(0) == -1){
1418
perror_plus("seteuid");
1419
}
1420
ret_errno = errno;
1421
errno = old_errno;
1422
return ret_errno;
1423
}
1424
1425
/* Set effective user ID to unprivileged saved user ID */
1426
int lower_privileges(void){
1427
int old_errno = errno;
1428
int ret_errno = 0;
1429
errno = 0;
1430
if(seteuid(uid) == -1){
1431
perror_plus("seteuid");
1432
}
1433
ret_errno = errno;
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
bool run_network_hooks(const char *mode, const char *interface,
1439
const float delay){
1440
struct dirent **direntries;
1441
struct dirent *direntry;
1442
int ret;
1443
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1444
alphasort);
1445
if(numhooks == -1){
1446
perror_plus("scandir");
1447
} else {
1448
int devnull = open("/dev/null", O_RDONLY);
1449
for(int i = 0; i < numhooks; i++){
1450
direntry = direntries[i];
1451
char *fullname = NULL;
1452
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1453
if(ret < 0){
1454
perror_plus("asprintf");
1455
continue;
1456
}
1457
if(debug){
1458
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1459
direntry->d_name);
1460
}
1461
pid_t hook_pid = fork();
1462
if(hook_pid == 0){
1463
/* Child */
1464
/* Raise privileges */
1465
raise_privileges_permanently();
1466
/* Set group */
1467
errno = 0;
1468
ret = setgid(0);
1469
if(ret == -1){
1470
perror_plus("setgid");
1471
}
1472
/* Reset supplementary groups */
1473
errno = 0;
1474
ret = setgroups(0, NULL);
1475
if(ret == -1){
1476
perror_plus("setgroups");
1477
}
1478
dup2(devnull, STDIN_FILENO);
1479
close(devnull);
1480
dup2(STDERR_FILENO, STDOUT_FILENO);
1481
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1482
if(ret == -1){
1483
perror_plus("setenv");
1484
_exit(EX_OSERR);
1485
}
1486
ret = setenv("DEVICE", interface, 1);
1487
if(ret == -1){
1488
perror_plus("setenv");
1489
_exit(EX_OSERR);
1490
}
1491
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1492
if(ret == -1){
1493
perror_plus("setenv");
1494
_exit(EX_OSERR);
1495
}
1496
ret = setenv("MODE", mode, 1);
1497
if(ret == -1){
1498
perror_plus("setenv");
1499
_exit(EX_OSERR);
1500
}
1501
char *delaystring;
1502
ret = asprintf(&delaystring, "%f", delay);
1503
if(ret == -1){
1504
perror_plus("asprintf");
1505
_exit(EX_OSERR);
1506
}
1507
ret = setenv("DELAY", delaystring, 1);
1508
if(ret == -1){
1509
free(delaystring);
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
free(delaystring);
1514
if(connect_to != NULL){
1515
ret = setenv("CONNECT", connect_to, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
}
1521
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1522
perror_plus("execl");
1523
_exit(EXIT_FAILURE);
1524
}
1525
} else {
1526
int status;
1527
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1528
perror_plus("waitpid");
1529
free(fullname);
1530
continue;
1531
}
1532
if(WIFEXITED(status)){
1533
if(WEXITSTATUS(status) != 0){
1534
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1535
" with status %d\n", direntry->d_name,
1536
WEXITSTATUS(status));
1537
free(fullname);
1538
continue;
1539
}
1540
} else if(WIFSIGNALED(status)){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1542
" signal %d\n", direntry->d_name,
1543
WTERMSIG(status));
1544
free(fullname);
1545
continue;
1546
} else {
1547
fprintf_plus(stderr, "Warning: network hook \"%s\""
1548
" crashed\n", direntry->d_name);
1549
free(fullname);
1550
continue;
1551
}
1552
}
1553
free(fullname);
1554
if(debug){
1555
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1556
direntry->d_name);
1557
}
1558
}
1559
close(devnull);
1560
}
1561
return true;
1562
}
1563
1564
int bring_up_interface(const char * const interface, const float delay){
1565
int sd = -1;
1566
int old_errno = errno;
1567
int ret_errno = 0;
1568
int ret;
1569
struct ifreq network;
1570
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1571
if(if_index == 0){
1572
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1573
errno = old_errno;
1574
return ENXIO;
1575
}
1576
1577
if(quit_now){
1578
errno = old_errno;
1579
return EINTR;
1580
}
1581
1582
/* Re-raise priviliges */
1583
raise_privileges();
1584
1585
#ifdef __linux__
1586
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1587
messages about the network interface to mess up the prompt */
1588
ret = klogctl(8, NULL, 5);
1589
bool restore_loglevel = true;
1590
if(ret == -1){
1591
restore_loglevel = false;
1592
perror_plus("klogctl");
1593
}
1594
#endif /* __linux__ */
1595
1596
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1597
if(sd < 0){
1598
ret_errno = errno;
1599
perror_plus("socket");
1600
#ifdef __linux__
1601
if(restore_loglevel){
1602
ret = klogctl(7, NULL, 0);
1603
if(ret == -1){
1604
perror_plus("klogctl");
1605
}
1606
}
1607
#endif /* __linux__ */
1608
/* Lower privileges */
1609
lower_privileges();
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
if(ret == -1){
1616
ret_errno = errno;
1617
perror_plus("ioctl SIOCGIFFLAGS");
1618
#ifdef __linux__
1619
if(restore_loglevel){
1620
ret = klogctl(7, NULL, 0);
1621
if(ret == -1){
1622
perror_plus("klogctl");
1623
}
1624
}
1625
#endif /* __linux__ */
1626
/* Lower privileges */
1627
lower_privileges();
1628
errno = old_errno;
1629
return ret_errno;
1630
}
1631
if((network.ifr_flags & IFF_UP) == 0){
1632
network.ifr_flags |= IFF_UP;
1633
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1634
if(ret == -1){
1635
ret_errno = errno;
1636
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1637
#ifdef __linux__
1638
if(restore_loglevel){
1639
ret = klogctl(7, NULL, 0);
1640
if(ret == -1){
1641
perror_plus("klogctl");
1642
}
1643
}
1644
#endif /* __linux__ */
1645
/* Lower privileges */
1646
lower_privileges();
1647
errno = old_errno;
1648
return ret_errno;
1649
}
1650
}
1651
/* Sleep checking until interface is running.
1652
Check every 0.25s, up to total time of delay */
1653
for(int i=0; i < delay * 4; i++){
1654
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1655
if(ret == -1){
1656
perror_plus("ioctl SIOCGIFFLAGS");
1657
} else if(network.ifr_flags & IFF_RUNNING){
1658
break;
1659
}
1660
struct timespec sleeptime = { .tv_nsec = 250000000 };
1661
ret = nanosleep(&sleeptime, NULL);
1662
if(ret == -1 and errno != EINTR){
1663
perror_plus("nanosleep");
1664
}
1665
}
1666
/* Close the socket */
1667
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1668
if(ret == -1){
1669
perror_plus("close");
1670
}
1671
#ifdef __linux__
1672
if(restore_loglevel){
1673
/* Restores kernel loglevel to default */
1674
ret = klogctl(7, NULL, 0);
1675
if(ret == -1){
1676
perror_plus("klogctl");
1677
}
1678
}
1679
#endif /* __linux__ */
1680
/* Lower privileges */
1681
lower_privileges();
1682
errno = old_errno;
1683
return 0;
1684
}
1685
1686
895
int main(int argc, char *argv[]){
1687
896
AvahiSServiceBrowser *sb = NULL;
1688
897
int error;
1690
899
intmax_t tmpmax;
1691
900
char *tmp;
1692
901
int exitcode = EXIT_SUCCESS;
1693
const char *interface = "";
902
const char *interface = "eth0";
1694
903
struct ifreq network;
1695
int sd = -1;
1696
bool take_down_interface = false;
904
int sd;
905
uid_t uid;
906
gid_t gid;
907
char *connect_to = NULL;
1697
908
char tempdir[] = "/tmp/mandosXXXXXX";
1698
909
bool tempdir_created = false;
1699
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1703
914
bool gnutls_initialized = false;
1704
915
bool gpgme_initialized = false;
1705
916
float delay = 2.5f;
1706
double retry_interval = 10; /* 10s between trying a server and
1707
retrying the same server again */
1708
917
1709
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
918
struct sigaction old_sigterm_action;
1710
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1711
920
1712
uid = getuid();
1713
gid = getgid();
1714
1715
/* Lower any group privileges we might have, just to be safe */
1716
errno = 0;
1717
ret = setgid(gid);
1718
if(ret == -1){
1719
perror_plus("setgid");
1720
}
1721
1722
/* Lower user privileges (temporarily) */
1723
errno = 0;
1724
ret = seteuid(uid);
1725
if(ret == -1){
1726
perror_plus("seteuid");
1727
}
1728
1729
if(quit_now){
1730
goto end;
1731
}
1732
1733
921
{
1734
922
struct argp_option options[] = {
1735
923
{ .name = "debug", .key = 128,
1764
952
.arg = "SECONDS",
1765
953
.doc = "Maximum delay to wait for interface startup",
1766
954
.group = 2 },
1767
{ .name = "retry", .key = 132,
1768
.arg = "SECONDS",
1769
.doc = "Retry interval used when denied by the Mandos server",
1770
.group = 2 },
1771
{ .name = "network-hook-dir", .key = 133,
1772
.arg = "DIR",
1773
.doc = "Directory where network hooks are located",
1774
.group = 2 },
1775
/*
1776
* These reproduce what we would get without ARGP_NO_HELP
1777
*/
1778
{ .name = "help", .key = '?',
1779
.doc = "Give this help list", .group = -1 },
1780
{ .name = "usage", .key = -3,
1781
.doc = "Give a short usage message", .group = -1 },
1782
{ .name = "version", .key = 'V',
1783
.doc = "Print program version", .group = -1 },
1784
955
{ .name = NULL }
1785
956
};
1786
957
1787
958
error_t parse_opt(int key, char *arg,
1788
959
struct argp_state *state){
1789
errno = 0;
1790
960
switch(key){
1791
961
case 128: /* --debug */
1792
962
debug = true;
1808
978
tmpmax = strtoimax(arg, &tmp, 10);
1809
979
if(errno != 0 or tmp == arg or *tmp != '\0'
1810
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1811
argp_error(state, "Bad number of DH bits");
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1812
983
}
1813
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1814
985
break;
1819
990
errno = 0;
1820
991
delay = strtof(arg, &tmp);
1821
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
1822
argp_error(state, "Bad delay");
1823
}
1824
case 132: /* --retry */
1825
errno = 0;
1826
retry_interval = strtod(arg, &tmp);
1827
if(errno != 0 or tmp == arg or *tmp != '\0'
1828
or (retry_interval * 1000) > INT_MAX
1829
or retry_interval < 0){
1830
argp_error(state, "Bad retry interval");
1831
}
1832
break;
1833
case 133: /* --network-hook-dir */
1834
hookdir = arg;
1835
break;
1836
/*
1837
* These reproduce what we would get without ARGP_NO_HELP
1838
*/
1839
case '?': /* --help */
1840
argp_state_help(state, state->out_stream,
1841
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1842
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1843
case -3: /* --usage */
1844
argp_state_help(state, state->out_stream,
1845
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1846
case 'V': /* --version */
1847
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1848
exit(argp_err_exit_status);
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1849
1000
break;
1850
1001
default:
1851
1002
return ARGP_ERR_UNKNOWN;
1852
1003
}
1853
return errno;
1004
return 0;
1854
1005
}
1855
1006
1856
1007
struct argp argp = { .options = options, .parser = parse_opt,
1857
1008
.args_doc = "",
1858
1009
.doc = "Mandos client -- Get and decrypt"
1859
1010
" passwords from a Mandos server" };
1860
ret = argp_parse(&argp, argc, argv,
1861
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1862
switch(ret){
1863
case 0:
1864
break;
1865
case ENOMEM:
1866
default:
1867
errno = ret;
1868
perror_plus("argp_parse");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
case EINVAL:
1872
exitcode = EX_USAGE;
1873
goto end;
1874
}
1875
}
1876
1877
{
1878
/* Work around Debian bug #633582:
1879
<http://bugs.debian.org/633582> */
1880
1881
/* Re-raise priviliges */
1882
if(raise_privileges() == 0){
1883
struct stat st;
1884
1885
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1886
int seckey_fd = open(seckey, O_RDONLY);
1887
if(seckey_fd == -1){
1888
perror_plus("open");
1889
} else {
1890
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1891
if(ret == -1){
1892
perror_plus("fstat");
1893
} else {
1894
if(S_ISREG(st.st_mode)
1895
and st.st_uid == 0 and st.st_gid == 0){
1896
ret = fchown(seckey_fd, uid, gid);
1897
if(ret == -1){
1898
perror_plus("fchown");
1899
}
1900
}
1901
}
1902
TEMP_FAILURE_RETRY(close(seckey_fd));
1903
}
1904
}
1905
1906
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1907
int pubkey_fd = open(pubkey, O_RDONLY);
1908
if(pubkey_fd == -1){
1909
perror_plus("open");
1910
} else {
1911
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1912
if(ret == -1){
1913
perror_plus("fstat");
1914
} else {
1915
if(S_ISREG(st.st_mode)
1916
and st.st_uid == 0 and st.st_gid == 0){
1917
ret = fchown(pubkey_fd, uid, gid);
1918
if(ret == -1){
1919
perror_plus("fchown");
1920
}
1921
}
1922
}
1923
TEMP_FAILURE_RETRY(close(pubkey_fd));
1924
}
1925
}
1926
1927
/* Lower privileges */
1928
errno = 0;
1929
ret = seteuid(uid);
1930
if(ret == -1){
1931
perror_plus("seteuid");
1932
}
1933
}
1934
}
1935
1936
/* Run network hooks */
1937
if(not run_network_hooks("start", interface, delay)){
1938
goto end;
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
1939
1017
}
1940
1018
1941
1019
if(not debug){
1942
1020
avahi_set_log_function(empty_log);
1943
1021
}
1944
1022
1945
if(interface[0] == '\0'){
1946
struct dirent **direntries;
1947
/* First look for interfaces that are up */
1948
ret = scandir(sys_class_net, &direntries, up_interface,
1949
alphasort);
1950
if(ret == 0){
1951
/* No up interfaces, look for any good interfaces */
1952
free(direntries);
1953
ret = scandir(sys_class_net, &direntries, good_interface,
1954
alphasort);
1955
}
1956
if(ret >= 1){
1957
/* Pick the first interface returned */
1958
interface = strdup(direntries[0]->d_name);
1959
if(debug){
1960
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1961
}
1962
if(interface == NULL){
1963
perror_plus("malloc");
1964
free(direntries);
1965
exitcode = EXIT_FAILURE;
1966
goto end;
1967
}
1968
free(direntries);
1969
} else {
1970
free(direntries);
1971
fprintf_plus(stderr, "Could not find a network interface\n");
1972
exitcode = EXIT_FAILURE;
1973
goto end;
1974
}
1975
}
1976
1977
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1978
1024
from the signal handler */
1979
1025
/* Initialize the pseudo-RNG for Avahi */
1980
1026
srand((unsigned int) time(NULL));
1981
1027
mc.simple_poll = avahi_simple_poll_new();
1982
1028
if(mc.simple_poll == NULL){
1983
fprintf_plus(stderr,
1984
"Avahi: Failed to create simple poll object.\n");
1985
exitcode = EX_UNAVAILABLE;
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1986
1031
goto end;
1987
1032
}
1988
1033
1989
1034
sigemptyset(&sigterm_action.sa_mask);
1990
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1991
1036
if(ret == -1){
1992
perror_plus("sigaddset");
1993
exitcode = EX_OSERR;
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1994
1039
goto end;
1995
1040
}
1996
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1997
1042
if(ret == -1){
1998
perror_plus("sigaddset");
1999
exitcode = EX_OSERR;
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
2000
1045
goto end;
2001
1046
}
2002
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2003
1048
if(ret == -1){
2004
perror_plus("sigaddset");
2005
exitcode = EX_OSERR;
2006
goto end;
2007
}
2008
/* Need to check if the handler is SIG_IGN before handling:
2009
| [[info:libc:Initial Signal Actions]] |
2010
| [[info:libc:Basic Signal Handling]] |
2011
*/
2012
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2013
if(ret == -1){
2014
perror_plus("sigaction");
2015
return EX_OSERR;
2016
}
2017
if(old_sigterm_action.sa_handler != SIG_IGN){
2018
ret = sigaction(SIGINT, &sigterm_action, NULL);
2019
if(ret == -1){
2020
perror_plus("sigaction");
2021
exitcode = EX_OSERR;
2022
goto end;
2023
}
2024
}
2025
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2026
if(ret == -1){
2027
perror_plus("sigaction");
2028
return EX_OSERR;
2029
}
2030
if(old_sigterm_action.sa_handler != SIG_IGN){
2031
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2032
if(ret == -1){
2033
perror_plus("sigaction");
2034
exitcode = EX_OSERR;
2035
goto end;
2036
}
2037
}
2038
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2039
if(ret == -1){
2040
perror_plus("sigaction");
2041
return EX_OSERR;
2042
}
2043
if(old_sigterm_action.sa_handler != SIG_IGN){
2044
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2045
if(ret == -1){
2046
perror_plus("sigaction");
2047
exitcode = EX_OSERR;
2048
goto end;
2049
}
2050
}
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
2051
1059
2052
1060
/* If the interface is down, bring it up */
2053
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2054
ret = bring_up_interface(interface, delay);
2055
if(ret != 0){
2056
errno = ret;
2057
perror_plus("Failed to bring up interface");
2058
}
2059
}
2060
2061
if(quit_now){
2062
goto end;
1061
if(interface[0] != '\0'){
1062
#ifdef __linux__
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1067
if(ret == -1){
1068
restore_loglevel = false;
1069
perror("klogctl");
1070
}
1071
#endif /* __linux__ */
1072
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1077
#ifdef __linux__
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1080
if(ret == -1){
1081
perror("klogctl");
1082
}
1083
}
1084
#endif /* __linux__ */
1085
goto end;
1086
}
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1100
goto end;
1101
}
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1108
#ifdef __linux__
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
1111
if(ret == -1){
1112
perror("klogctl");
1113
}
1114
}
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
break;
1126
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1136
}
1137
#ifdef __linux__
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
1143
}
1144
}
1145
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
2063
1160
}
2064
1161
2065
1162
ret = init_gnutls_global(pubkey, seckey);
2066
1163
if(ret == -1){
2067
fprintf_plus(stderr, "init_gnutls_global failed\n");
2068
exitcode = EX_UNAVAILABLE;
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2069
1166
goto end;
2070
1167
} else {
2071
1168
gnutls_initialized = true;
2072
1169
}
2073
1170
2074
if(quit_now){
2075
goto end;
2076
}
2077
2078
1171
if(mkdtemp(tempdir) == NULL){
2079
perror_plus("mkdtemp");
1172
perror("mkdtemp");
2080
1173
goto end;
2081
1174
}
2082
1175
tempdir_created = true;
2083
1176
2084
if(quit_now){
2085
goto end;
2086
}
2087
2088
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
2089
fprintf_plus(stderr, "init_gpgme failed\n");
2090
exitcode = EX_UNAVAILABLE;
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2091
1180
goto end;
2092
1181
} else {
2093
1182
gpgme_initialized = true;
2094
1183
}
2095
1184
2096
if(quit_now){
2097
goto end;
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
2098
1192
}
2099
1193
2100
1194
if(connect_to != NULL){
2101
1195
/* Connect directly, do not use Zeroconf */
2102
1196
/* (Mainly meant for debugging) */
2103
1197
char *address = strrchr(connect_to, ':');
2104
2105
1198
if(address == NULL){
2106
fprintf_plus(stderr, "No colon in address\n");
2107
exitcode = EX_USAGE;
2108
goto end;
2109
}
2110
2111
if(quit_now){
2112
goto end;
2113
}
2114
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
2115
1203
uint16_t port;
2116
1204
errno = 0;
2117
1205
tmpmax = strtoimax(address+1, &tmp, 10);
2118
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2119
1207
or tmpmax != (uint16_t)tmpmax){
2120
fprintf_plus(stderr, "Bad port number\n");
2121
exitcode = EX_USAGE;
2122
goto end;
2123
}
2124
2125
if(quit_now){
2126
goto end;
2127
}
2128
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
2129
1212
port = (uint16_t)tmpmax;
2130
1213
*address = '\0';
1214
address = connect_to;
2131
1215
/* Colon in address indicates IPv6 */
2132
1216
int af;
2133
if(strchr(connect_to, ':') != NULL){
1217
if(strchr(address, ':') != NULL){
2134
1218
af = AF_INET6;
2135
/* Accept [] around IPv6 address - see RFC 5952 */
2136
if(connect_to[0] == '[' and address[-1] == ']')
2137
{
2138
connect_to++;
2139
address[-1] = '\0';
2140
}
2141
1219
} else {
2142
1220
af = AF_INET;
2143
1221
}
2144
address = connect_to;
2145
2146
if(quit_now){
2147
goto end;
2148
}
2149
2150
while(not quit_now){
2151
ret = start_mandos_communication(address, port, if_index, af);
2152
if(quit_now or ret == 0){
2153
break;
2154
}
2155
if(debug){
2156
fprintf_plus(stderr, "Retrying in %d seconds\n",
2157
(int)retry_interval);
2158
}
2159
sleep((int)retry_interval);
2160
}
2161
2162
if (not quit_now){
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2163
1226
exitcode = EXIT_SUCCESS;
2164
1227
}
1228
goto end;
1229
}
2165
1230
2166
goto end;
2167
}
2168
2169
if(quit_now){
2170
goto end;
2171
}
2172
2173
1231
{
2174
1232
AvahiServerConfig config;
2175
1233
/* Do not publish any local Zeroconf records */
2190
1248
2191
1249
/* Check if creating the Avahi server object succeeded */
2192
1250
if(mc.server == NULL){
2193
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2194
avahi_strerror(error));
2195
exitcode = EX_UNAVAILABLE;
2196
goto end;
2197
}
2198
2199
if(quit_now){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
2200
1254
goto end;
2201
1255
}
2202
1256
2205
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2206
1260
NULL, 0, browse_callback, NULL);
2207
1261
if(sb == NULL){
2208
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2209
avahi_strerror(avahi_server_errno(mc.server)));
2210
exitcode = EX_UNAVAILABLE;
2211
goto end;
2212
}
2213
2214
if(quit_now){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
2215
1265
goto end;
2216
1266
}
2217
1267
2218
1268
/* Run the main loop */
2219
1269
2220
1270
if(debug){
2221
fprintf_plus(stderr, "Starting Avahi loop search\n");
2222
}
2223
2224
ret = avahi_loop_with_timeout(mc.simple_poll,
2225
(int)(retry_interval * 1000));
2226
if(debug){
2227
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2228
(ret == 0) ? "successfully" : "with error");
2229
}
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
2230
1275
2231
1276
end:
2232
1277
2233
1278
if(debug){
2234
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2235
1280
}
2236
1281
2237
1282
/* Cleanup things */
2254
1299
gpgme_release(mc.ctx);
2255
1300
}
2256
1301
2257
/* Cleans up the circular linked list of Mandos servers the client
2258
has seen */
2259
if(mc.current_server != NULL){
2260
mc.current_server->prev->next = NULL;
2261
while(mc.current_server != NULL){
2262
server *next = mc.current_server->next;
2263
free(mc.current_server);
2264
mc.current_server = next;
2265
}
2266
}
2267
2268
/* Run network hooks */
2269
run_network_hooks("stop", interface, delay);
2270
2271
/* Re-raise priviliges */
2272
{
2273
raise_privileges();
2274
2275
/* Take down the network interface */
2276
if(take_down_interface and geteuid() == 0){
2277
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2278
if(ret == -1){
2279
perror_plus("ioctl SIOCGIFFLAGS");
2280
} else if(network.ifr_flags & IFF_UP){
2281
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2282
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2283
if(ret == -1){
2284
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2285
}
2286
}
2287
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2288
if(ret == -1){
2289
perror_plus("close");
2290
}
2291
}
2292
}
2293
/* Lower privileges permanently */
2294
errno = 0;
2295
ret = setuid(uid);
2296
if(ret == -1){
2297
perror_plus("setuid");
2298
}
2299
2300
/* Removes the GPGME temp directory and all files inside */
1302
/* Removes the temp directory used by GPGME */
2301
1303
if(tempdir_created){
2302
struct dirent **direntries = NULL;
2303
struct dirent *direntry = NULL;
2304
int numentries = scandir(tempdir, &direntries, notdotentries,
2305
alphasort);
2306
if (numentries > 0){
2307
for(int i = 0; i < numentries; i++){
2308
direntry = direntries[i];
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
2309
1324
char *fullname = NULL;
2310
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
2311
1326
direntry->d_name);
2312
1327
if(ret < 0){
2313
perror_plus("asprintf");
1328
perror("asprintf");
2314
1329
continue;
2315
1330
}
2316
1331
ret = remove(fullname);
2317
1332
if(ret == -1){
2318
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2319
strerror(errno));
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
2320
1335
}
2321
1336
free(fullname);
2322
1337
}
2323
}
2324
2325
/* need to clean even if 0 because man page doesn't specify */
2326
free(direntries);
2327
if (numentries == -1){
2328
perror_plus("scandir");
1338
closedir(d);
2329
1339
}
2330
1340
ret = rmdir(tempdir);
2331
1341
if(ret == -1 and errno != ENOENT){
2332
perror_plus("rmdir");
2333
}
2334
}
2335
2336
if(quit_now){
2337
sigemptyset(&old_sigterm_action.sa_mask);
2338
old_sigterm_action.sa_handler = SIG_DFL;
2339
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2340
&old_sigterm_action,
2341
NULL));
2342
if(ret == -1){
2343
perror_plus("sigaction");
2344
}
2345
do {
2346
ret = raise(signal_received);
2347
} while(ret != 0 and errno == EINTR);
2348
if(ret != 0){
2349
perror_plus("raise");
2350
abort();
2351
}
2352
TEMP_FAILURE_RETRY(pause());
1342
perror("rmdir");
1343
}
2353
1344
}
2354
1345
2355
1346
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0