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- Committer: Teddy Hogeborn
- Date: 2009-02-13 05:38:21 UTC
- Revision ID: teddy@fukt.bsnet.se-20090213053821-03e696gckk4nbjps
Support not using IPv6 in server:
* mandos (AvahiService.__init__): Take new "protocol" parameter. All
callers changed.
(IPv6_TCPServer.__init__): Take new "use_ipv6" parameter. All
callers changed.
(IPv6_TCPServer.server_bind): Create IPv4 socket if not using IPv6.
(main): New "--no-ipv6" command line option. New "use_ipv6" config
option.
* mandos-options.xml ([@id="address"]): Document conditional IPv4
address support.
([@id="ipv6"]): New paragraph.
* mandos.conf (use_ipv6): New config option.
* mandos.conf.xml (OPTIONS): Document new "use_dbus" option.
(EXAMPLE): Changed to use IPv6 link-local address. Added "use_ipv6"
option.
* mandos.xml (SYNOPSIS): New "--no-ipv6" option.
(OPTIONS): Document new "--no-ipv6" option.
* mandos (AvahiService.__init__): Take new "protocol" parameter. All
callers changed.
(IPv6_TCPServer.__init__): Take new "use_ipv6" parameter. All
callers changed.
(IPv6_TCPServer.server_bind): Create IPv4 socket if not using IPv6.
(main): New "--no-ipv6" command line option. New "use_ipv6" config
option.
* mandos-options.xml ([@id="address"]): Document conditional IPv4
address support.
([@id="ipv6"]): New paragraph.
* mandos.conf (use_ipv6): New config option.
* mandos.conf.xml (OPTIONS): Document new "use_dbus" option.
(EXAMPLE): Changed to use IPv6 link-local address. Added "use_ipv6"
option.
* mandos.xml (SYNOPSIS): New "--no-ipv6" option.
(OPTIONS): Document new "--no-ipv6" option.
- files removed:
- DBUS-API
- debian/source
- 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() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
43
39
stdout, ferror(), remove() */
44
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
48
44
#include <stdbool.h> /* bool, false, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
53
49
sockaddr_in6, PF_INET6,
54
50
SOCK_STREAM, uid_t, gid_t, open(),
55
51
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
52
#include <sys/stat.h> /* open() */
57
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
54
inet_pton(), connect() */
59
55
#include <fcntl.h> /* open() */
62
58
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
59
strtoimax() */
64
60
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
68
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
64
SIOCSIFFLAGS, if_indextoname(),
70
65
if_nametoindex(), IF_NAMESIZE */
72
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
68
*/
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
78
73
#include <iso646.h> /* not, or, and */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
78
#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() */
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
90
81
91
82
#ifdef __linux__
92
83
#include <sys/klog.h> /* klogctl() */
110
101
init_gnutls_session(),
111
102
GNUTLS_* */
112
103
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
104
/* gnutls_certificate_set_openpgp_key_file(),
105
GNUTLS_OPENPGP_FMT_BASE64 */
115
106
116
107
/* GPGME */
117
108
#include <gpgme.h> /* All GPGME types, constants and
125
116
#define PATHDIR "/conf/conf.d/mandos"
126
117
#define SECKEY "seckey.txt"
127
118
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
119
130
120
bool debug = false;
131
121
static const char mandos_protocol_version[] = "1";
132
122
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
124
149
125
/* Used for passing in values through the Avahi callback functions */
150
126
typedef struct {
155
131
gnutls_dh_params_t dh_params;
156
132
const char *priority;
157
133
gpgme_ctx_t ctx;
158
server *current_server;
159
134
} mandos_context;
160
135
161
136
/* global context so signal handler can reach it*/
162
137
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
138
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
166
167
sig_atomic_t quit_now = 0;
168
int signal_received = 0;
169
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
176
140
177
141
/*
178
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
180
144
* "buffer_length" is how much is already used.
181
145
*/
182
146
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
147
size_t buffer_capacity){
184
148
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
149
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
150
if(buffer == NULL){
191
155
return buffer_capacity;
192
156
}
193
157
194
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
197
int ret;
198
server *new_server = malloc(sizeof(server));
199
if(new_server == NULL){
200
perror_plus("malloc");
201
return -1;
202
}
203
*new_server = (server){ .ip = strdup(ip),
204
.port = port,
205
.if_index = if_index,
206
.af = af };
207
if(new_server->ip == NULL){
208
perror_plus("strdup");
209
return -1;
210
}
211
/* Special case of first server */
212
if (mc.current_server == NULL){
213
new_server->next = new_server;
214
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
217
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
220
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
229
}
230
231
158
/*
232
159
* Initialize GPGME.
233
160
*/
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
161
static bool init_gpgme(const char *seckey,
162
const char *pubkey, const char *tempdir){
163
int ret;
236
164
gpgme_error_t rc;
237
165
gpgme_engine_info_t engine_info;
238
166
241
169
* Helper function to insert pub and seckey to the engine keyring.
242
170
*/
243
171
bool import_key(const char *filename){
244
int ret;
245
172
int fd;
246
173
gpgme_data_t pgp_data;
247
174
248
175
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
249
176
if(fd == -1){
250
perror_plus("open");
177
perror("open");
251
178
return false;
252
179
}
253
180
254
181
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
182
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
258
184
gpgme_strsource(rc), gpgme_strerror(rc));
259
185
return false;
260
186
}
261
187
262
188
rc = gpgme_op_import(mc.ctx, pgp_data);
263
189
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
266
191
gpgme_strsource(rc), gpgme_strerror(rc));
267
192
return false;
268
193
}
269
194
270
195
ret = (int)TEMP_FAILURE_RETRY(close(fd));
271
196
if(ret == -1){
272
perror_plus("close");
197
perror("close");
273
198
}
274
199
gpgme_data_release(pgp_data);
275
200
return true;
276
201
}
277
202
278
203
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
204
fprintf(stderr, "Initializing GPGME\n");
281
205
}
282
206
283
207
/* Init GPGME */
284
208
gpgme_check_version(NULL);
285
209
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
210
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
289
212
gpgme_strsource(rc), gpgme_strerror(rc));
290
213
return false;
291
214
}
292
215
293
/* Set GPGME home directory for the OpenPGP engine only */
216
/* Set GPGME home directory for the OpenPGP engine only */
294
217
rc = gpgme_get_engine_info(&engine_info);
295
218
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
298
220
gpgme_strsource(rc), gpgme_strerror(rc));
299
221
return false;
300
222
}
307
229
engine_info = engine_info->next;
308
230
}
309
231
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
312
233
return false;
313
234
}
314
235
315
236
/* Create new GPGME "context" */
316
237
rc = gpgme_new(&(mc.ctx));
317
238
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
321
241
return false;
322
242
}
323
243
325
245
return false;
326
246
}
327
247
328
return true;
248
return true;
329
249
}
330
250
331
251
/*
342
262
ssize_t plaintext_length = 0;
343
263
344
264
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
347
266
}
348
267
349
268
/* Create new GPGME data buffer from memory cryptotext */
350
269
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
270
0);
352
271
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
273
gpgme_strsource(rc), gpgme_strerror(rc));
356
274
return -1;
357
275
}
359
277
/* Create new empty GPGME data buffer for the plaintext */
360
278
rc = gpgme_data_new(&dh_plain);
361
279
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
364
281
gpgme_strsource(rc), gpgme_strerror(rc));
365
282
gpgme_data_release(dh_crypto);
366
283
return -1;
370
287
data buffer */
371
288
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
289
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
375
291
gpgme_strsource(rc), gpgme_strerror(rc));
376
292
plaintext_length = -1;
377
293
if(debug){
378
294
gpgme_decrypt_result_t result;
379
295
result = gpgme_op_decrypt_result(mc.ctx);
380
296
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
298
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
299
fprintf(stderr, "Unsupported algorithm: %s\n",
386
300
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
301
fprintf(stderr, "Wrong key usage: %u\n",
389
302
result->wrong_key_usage);
390
303
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
304
fprintf(stderr, "File name: %s\n", result->file_name);
393
305
}
394
306
gpgme_recipient_t recipient;
395
307
recipient = result->recipients;
396
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
406
recipient = recipient->next;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
407
318
}
408
319
}
409
320
}
411
322
}
412
323
413
324
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
326
}
417
327
418
328
/* Seek back to the beginning of the GPGME plaintext data buffer */
419
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
420
perror_plus("gpgme_data_seek");
330
perror("gpgme_data_seek");
421
331
plaintext_length = -1;
422
332
goto decrypt_end;
423
333
}
425
335
*plaintext = NULL;
426
336
while(true){
427
337
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
338
(size_t)plaintext_length,
339
plaintext_capacity);
430
340
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
341
perror("incbuffer");
342
plaintext_length = -1;
343
goto decrypt_end;
434
344
}
435
345
436
346
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
441
351
break;
442
352
}
443
353
if(ret < 0){
444
perror_plus("gpgme_data_read");
354
perror("gpgme_data_read");
445
355
plaintext_length = -1;
446
356
goto decrypt_end;
447
357
}
449
359
}
450
360
451
361
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
362
fprintf(stderr, "Decrypted password is: ");
454
363
for(ssize_t i = 0; i < plaintext_length; i++){
455
364
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
365
}
478
387
/* GnuTLS log function callback */
479
388
static void debuggnutls(__attribute__((unused)) int level,
480
389
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
390
fprintf(stderr, "GnuTLS: %s", string);
482
391
}
483
392
484
393
static int init_gnutls_global(const char *pubkeyfilename,
486
395
int ret;
487
396
488
397
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
398
fprintf(stderr, "Initializing GnuTLS\n");
491
399
}
492
400
493
401
ret = gnutls_global_init();
494
402
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
497
405
return -1;
498
406
}
499
407
506
414
}
507
415
508
416
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
417
gnutls_certificate_allocate_credentials(&mc.cred);
510
418
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
513
424
gnutls_global_deinit();
514
425
return -1;
515
426
}
516
427
517
428
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
520
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
431
seckeyfilename);
522
432
}
526
436
GNUTLS_OPENPGP_FMT_BASE64);
527
437
if(ret != GNUTLS_E_SUCCESS){
528
438
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
439
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
440
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
441
fprintf(stderr, "The GnuTLS error is: %s\n",
442
safer_gnutls_strerror(ret));
534
443
goto globalfail;
535
444
}
536
445
537
446
/* GnuTLS server initialization */
538
447
ret = gnutls_dh_params_init(&mc.dh_params);
539
448
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
542
450
" %s\n", safer_gnutls_strerror(ret));
543
451
goto globalfail;
544
452
}
545
453
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
454
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
549
456
safer_gnutls_strerror(ret));
550
457
goto globalfail;
551
458
}
565
472
static int init_gnutls_session(gnutls_session_t *session){
566
473
int ret;
567
474
/* GnuTLS session creation */
568
do {
569
ret = gnutls_init(session, GNUTLS_SERVER);
570
if(quit_now){
571
return -1;
572
}
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
475
ret = gnutls_init(session, GNUTLS_SERVER);
574
476
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
577
478
safer_gnutls_strerror(ret));
578
479
}
579
480
580
481
{
581
482
const char *err;
582
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
584
if(quit_now){
585
gnutls_deinit(*session);
586
return -1;
587
}
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
589
484
if(ret != GNUTLS_E_SUCCESS){
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
594
488
gnutls_deinit(*session);
595
489
return -1;
596
490
}
597
491
}
598
492
599
do {
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
602
if(quit_now){
603
gnutls_deinit(*session);
604
return -1;
605
}
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
607
495
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
610
497
safer_gnutls_strerror(ret));
611
498
gnutls_deinit(*session);
612
499
return -1;
613
500
}
614
501
615
502
/* ignore client certificate if any. */
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
617
505
618
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
619
507
628
516
static int start_mandos_communication(const char *ip, uint16_t port,
629
517
AvahiIfIndex if_index,
630
518
int af){
631
int ret, tcp_sd = -1;
519
int ret, tcp_sd;
632
520
ssize_t sret;
633
521
union {
634
522
struct sockaddr_in in;
635
523
struct sockaddr_in6 in6;
636
524
} to;
637
525
char *buffer = NULL;
638
char *decrypted_buffer = NULL;
526
char *decrypted_buffer;
639
527
size_t buffer_length = 0;
640
528
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
641
530
size_t written;
642
int retval = -1;
531
int retval = 0;
643
532
gnutls_session_t session;
644
533
int pf; /* Protocol family */
645
534
646
errno = 0;
647
648
if(quit_now){
649
errno = EINTR;
650
return -1;
651
}
652
653
535
switch(af){
654
536
case AF_INET6:
655
537
pf = PF_INET6;
658
540
pf = PF_INET;
659
541
break;
660
542
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
663
errno = EINVAL;
543
fprintf(stderr, "Bad address family: %d\n", af);
664
544
return -1;
665
545
}
666
546
670
550
}
671
551
672
552
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
675
554
"\n", ip, port);
676
555
}
677
556
678
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
679
558
if(tcp_sd < 0){
680
int e = errno;
681
perror_plus("socket");
682
errno = e;
683
goto mandos_end;
684
}
685
686
if(quit_now){
687
errno = EINTR;
688
goto mandos_end;
559
perror("socket");
560
return -1;
689
561
}
690
562
691
563
memset(&to, 0, sizeof(to));
692
564
if(af == AF_INET6){
693
to.in6.sin6_family = (sa_family_t)af;
565
to.in6.sin6_family = (uint16_t)af;
694
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
695
567
} else { /* IPv4 */
696
568
to.in.sin_family = (sa_family_t)af;
697
569
ret = inet_pton(af, ip, &to.in.sin_addr);
698
570
}
699
571
if(ret < 0 ){
700
int e = errno;
701
perror_plus("inet_pton");
702
errno = e;
703
goto mandos_end;
572
perror("inet_pton");
573
return -1;
704
574
}
705
575
if(ret == 0){
706
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
709
errno = e;
710
goto mandos_end;
576
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
711
578
}
712
579
if(af == AF_INET6){
713
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
716
583
717
584
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
585
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
586
-Wunreachable-code*/
720
587
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
723
589
" without a network interface\n");
724
errno = EINVAL;
725
goto mandos_end;
590
return -1;
726
591
}
727
592
/* Set the network interface number as scope */
728
593
to.in6.sin6_scope_id = (uint32_t)if_index;
733
598
-Wunreachable-code */
734
599
}
735
600
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
741
601
if(debug){
742
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
743
603
char interface[IF_NAMESIZE];
744
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
perror_plus("if_indextoname");
605
perror("if_indextoname");
746
606
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
749
608
ip, interface, port);
750
609
}
751
610
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
754
613
}
755
614
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
615
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
763
622
sizeof(addrstr));
764
623
}
765
624
if(pcret == NULL){
766
perror_plus("inet_ntop");
625
perror("inet_ntop");
767
626
} else {
768
627
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
771
629
}
772
630
}
773
631
}
774
632
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
779
780
633
if(af == AF_INET6){
781
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
782
635
} else {
783
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
784
637
}
785
638
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
int e = errno;
788
perror_plus("connect");
789
errno = e;
790
}
791
goto mandos_end;
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
639
perror("connect");
640
return -1;
797
641
}
798
642
799
643
const char *out = mandos_protocol_version;
801
645
while(true){
802
646
size_t out_size = strlen(out);
803
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
804
out_size - written));
648
out_size - written));
805
649
if(ret == -1){
806
int e = errno;
807
perror_plus("write");
808
errno = e;
650
perror("write");
651
retval = -1;
809
652
goto mandos_end;
810
653
}
811
654
written += (size_t)ret;
819
662
break;
820
663
}
821
664
}
822
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
827
665
}
828
666
829
667
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
832
}
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
/* Spurious warning from -Wint-to-pointer-cast */
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
}
670
840
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
841
672
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
do {
673
do{
848
674
ret = gnutls_handshake(session);
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
853
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
854
676
855
677
if(ret != GNUTLS_E_SUCCESS){
856
678
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
859
680
gnutls_perror(ret);
860
681
}
861
errno = EPROTO;
682
retval = -1;
862
683
goto mandos_end;
863
684
}
864
685
865
686
/* Read OpenPGP packet that contains the wanted password */
866
687
867
688
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
690
ip);
870
691
}
871
692
872
693
while(true){
873
874
if(quit_now){
875
errno = EINTR;
876
goto mandos_end;
877
}
878
879
694
buffer_capacity = incbuffer(&buffer, buffer_length,
880
buffer_capacity);
695
buffer_capacity);
881
696
if(buffer_capacity == 0){
882
int e = errno;
883
perror_plus("incbuffer");
884
errno = e;
885
goto mandos_end;
886
}
887
888
if(quit_now){
889
errno = EINTR;
697
perror("incbuffer");
698
retval = -1;
890
699
goto mandos_end;
891
700
}
892
701
901
710
case GNUTLS_E_AGAIN:
902
711
break;
903
712
case GNUTLS_E_REHANDSHAKE:
904
do {
713
do{
905
714
ret = gnutls_handshake(session);
906
907
if(quit_now){
908
errno = EINTR;
909
goto mandos_end;
910
}
911
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
716
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
915
718
gnutls_perror(ret);
916
errno = EPROTO;
719
retval = -1;
917
720
goto mandos_end;
918
721
}
919
722
break;
920
723
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
724
fprintf(stderr, "Unknown error while reading data from"
923
725
" encrypted session with Mandos server\n");
726
retval = -1;
924
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
errno = EIO;
926
728
goto mandos_end;
927
729
}
928
730
} else {
931
733
}
932
734
933
735
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
936
}
937
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
do {
944
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
736
fprintf(stderr, "Closing TLS session\n");
737
}
738
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
950
740
951
741
if(buffer_length > 0){
952
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
buffer_length,
954
744
&decrypted_buffer);
955
745
if(decrypted_buffer_size >= 0){
956
957
746
written = 0;
958
747
while(written < (size_t) decrypted_buffer_size){
959
if(quit_now){
960
errno = EINTR;
961
goto mandos_end;
962
}
963
964
748
ret = (int)fwrite(decrypted_buffer + written, 1,
965
749
(size_t)decrypted_buffer_size - written,
966
750
stdout);
967
751
if(ret == 0 and ferror(stdout)){
968
int e = errno;
969
752
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
753
fprintf(stderr, "Error writing encrypted data: %s\n",
972
754
strerror(errno));
973
755
}
974
errno = e;
975
goto mandos_end;
756
retval = -1;
757
break;
976
758
}
977
759
written += (size_t)ret;
978
760
}
979
retval = 0;
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
980
764
}
765
} else {
766
retval = -1;
981
767
}
982
768
983
769
/* Shutdown procedure */
984
770
985
771
mandos_end:
986
{
987
int e = errno;
988
free(decrypted_buffer);
989
free(buffer);
990
if(tcp_sd >= 0){
991
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
992
}
993
if(ret == -1){
994
if(e == 0){
995
e = errno;
996
}
997
perror_plus("close");
998
}
999
gnutls_deinit(session);
1000
errno = e;
1001
if(quit_now){
1002
errno = EINTR;
1003
retval = -1;
1004
}
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
1005
776
}
777
gnutls_deinit(session);
1006
778
return retval;
1007
779
}
1008
780
1025
797
/* Called whenever a service has been resolved successfully or
1026
798
timed out */
1027
799
1028
if(quit_now){
1029
return;
1030
}
1031
1032
800
switch(event){
1033
801
default:
1034
802
case AVAHI_RESOLVER_FAILURE:
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
803
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1037
804
" of type '%s' in domain '%s': %s\n", name, type, domain,
1038
805
avahi_strerror(avahi_server_errno(mc.server)));
1039
806
break;
1043
810
char ip[AVAHI_ADDRESS_STR_MAX];
1044
811
avahi_address_snprint(ip, sizeof(ip), address);
1045
812
if(debug){
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1048
814
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
815
ip, (intmax_t)interface, port);
1050
816
}
1052
818
avahi_proto_to_af(proto));
1053
819
if(ret == 0){
1054
820
avahi_simple_poll_quit(mc.simple_poll);
1055
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1058
821
}
1059
822
}
1060
823
}
1076
839
/* Called whenever a new services becomes available on the LAN or
1077
840
is removed from the LAN */
1078
841
1079
if(quit_now){
1080
return;
1081
}
1082
1083
842
switch(event){
1084
843
default:
1085
844
case AVAHI_BROWSER_FAILURE:
1086
845
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
846
fprintf(stderr, "(Avahi browser) %s\n",
1089
847
avahi_strerror(avahi_server_errno(mc.server)));
1090
848
avahi_simple_poll_quit(mc.simple_poll);
1091
849
return;
1099
857
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1100
858
name, type, domain, protocol, 0,
1101
859
resolve_callback, NULL) == NULL)
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
860
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1104
861
name, avahi_strerror(avahi_server_errno(mc.server)));
1105
862
break;
1106
863
1110
867
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
868
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
869
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
870
fprintf(stderr, "No Mandos server found, still searching...\n");
1115
871
}
1116
872
break;
1117
873
}
1118
874
}
1119
875
1120
/* Signal handler that stops main loop after SIGTERM */
1121
static void handle_sigterm(int sig){
876
sig_atomic_t quit_now = 0;
877
878
/* stop main loop after sigterm has been called */
879
static void handle_sigterm(__attribute__((unused)) int sig){
1122
880
if(quit_now){
1123
881
return;
1124
882
}
1125
883
quit_now = 1;
1126
signal_received = sig;
1127
884
int old_errno = errno;
1128
/* set main loop to exit */
1129
885
if(mc.simple_poll != NULL){
1130
886
avahi_simple_poll_quit(mc.simple_poll);
1131
887
}
1132
888
errno = old_errno;
1133
889
}
1134
890
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
int ret;
1137
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
if(s < 0){
1140
perror_plus("socket");
1141
return false;
1142
}
1143
strcpy(ifr->ifr_name, ifname);
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
if(ret == -1){
1146
if(debug){
1147
perror_plus("ioctl SIOCGIFFLAGS");
1148
}
1149
return false;
1150
}
1151
return true;
1152
}
1153
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1161
}
1162
return false;
1163
}
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1169
}
1170
return true;
1171
}
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1177
}
1178
return false;
1179
}
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1182
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1185
}
1186
return false;
1187
}
1188
1189
/* Accept this device */
1190
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1193
}
1194
return true;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int good_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(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1212
if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1227
*/
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1230
return 0;
1231
}
1232
1233
struct ifreq ifr;
1234
if(not get_flags(if_entry->d_name, &ifr)){
1235
if(debug){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1245
if(debug){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1255
if(debug){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1258
if_entry->d_name);
1259
}
1260
return 0;
1261
}
1262
1263
if(not good_flags(if_entry->d_name, &ifr)){
1264
return 0;
1265
}
1266
return 1;
1267
}
1268
1269
int notdotentries(const struct dirent *direntry){
1270
/* Skip "." and ".." */
1271
if(direntry->d_name[0] == '.'
1272
and (direntry->d_name[1] == '\0'
1273
or (direntry->d_name[1] == '.'
1274
and direntry->d_name[2] == '\0'))){
1275
return 0;
1276
}
1277
return 1;
1278
}
1279
1280
/* Is this directory entry a runnable program? */
1281
int runnable_hook(const struct dirent *direntry){
1282
int ret;
1283
size_t sret;
1284
struct stat st;
1285
1286
if((direntry->d_name)[0] == '\0'){
1287
/* Empty name? */
1288
return 0;
1289
}
1290
1291
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
"abcdefghijklmnopqrstuvwxyz"
1293
"0123456789"
1294
"_-");
1295
if((direntry->d_name)[sret] != '\0'){
1296
/* Contains non-allowed characters */
1297
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
1305
char *fullname = NULL;
1306
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1307
if(ret < 0){
1308
perror_plus("asprintf");
1309
return 0;
1310
}
1311
1312
ret = stat(fullname, &st);
1313
if(ret == -1){
1314
if(debug){
1315
perror_plus("Could not stat hook");
1316
}
1317
return 0;
1318
}
1319
if(not (S_ISREG(st.st_mode))){
1320
/* Not a regular file */
1321
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1325
}
1326
return 0;
1327
}
1328
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
/* Not executable */
1330
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1334
}
1335
return 0;
1336
}
1337
return 1;
1338
}
1339
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1341
int ret;
1342
struct timespec now;
1343
struct timespec waited_time;
1344
intmax_t block_time;
1345
1346
while(true){
1347
if(mc.current_server == NULL){
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1351
}
1352
ret = avahi_simple_poll_iterate(s, -1);
1353
} else {
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1358
}
1359
/* the current time */
1360
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1361
if(ret == -1){
1362
perror_plus("clock_gettime");
1363
return -1;
1364
}
1365
/* Calculating in ms how long time between now and server
1366
who we visted longest time ago. Now - last seen. */
1367
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1369
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1371
/* total time is 10s/10,000ms.
1372
Converting to s from ms by dividing by 1,000,
1373
and ns to ms by dividing by 1,000,000. */
1374
block_time = ((retry_interval
1375
- ((intmax_t)waited_time.tv_sec * 1000))
1376
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1381
}
1382
1383
if(block_time <= 0){
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
mc.current_server->af);
1388
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1390
return 0;
1391
}
1392
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1394
if(ret == -1){
1395
perror_plus("clock_gettime");
1396
return -1;
1397
}
1398
mc.current_server = mc.current_server->next;
1399
block_time = 0; /* Call avahi to find new Mandos
1400
servers, but don't block */
1401
}
1402
1403
ret = avahi_simple_poll_iterate(s, (int)block_time);
1404
}
1405
if(ret != 0){
1406
if (ret > 0 or errno != EINTR){
1407
return (ret != 1) ? ret : 0;
1408
}
1409
}
1410
}
1411
}
1412
1413
891
int main(int argc, char *argv[]){
1414
892
AvahiSServiceBrowser *sb = NULL;
1415
893
int error;
1417
895
intmax_t tmpmax;
1418
896
char *tmp;
1419
897
int exitcode = EXIT_SUCCESS;
1420
const char *interface = "";
898
const char *interface = "eth0";
1421
899
struct ifreq network;
1422
int sd = -1;
1423
bool take_down_interface = false;
900
int sd;
1424
901
uid_t uid;
1425
902
gid_t gid;
903
char *connect_to = NULL;
1426
904
char tempdir[] = "/tmp/mandosXXXXXX";
1427
905
bool tempdir_created = false;
1428
906
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1432
910
bool gnutls_initialized = false;
1433
911
bool gpgme_initialized = false;
1434
912
float delay = 2.5f;
1435
double retry_interval = 10; /* 10s between trying a server and
1436
retrying the same server again */
1437
913
1438
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
914
struct sigaction old_sigterm_action;
1439
915
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1440
916
1441
uid = getuid();
1442
gid = getgid();
1443
1444
/* Lower any group privileges we might have, just to be safe */
1445
errno = 0;
1446
ret = setgid(gid);
1447
if(ret == -1){
1448
perror_plus("setgid");
1449
}
1450
1451
/* Lower user privileges (temporarily) */
1452
errno = 0;
1453
ret = seteuid(uid);
1454
if(ret == -1){
1455
perror_plus("seteuid");
1456
}
1457
1458
if(quit_now){
1459
goto end;
1460
}
1461
1462
917
{
1463
918
struct argp_option options[] = {
1464
919
{ .name = "debug", .key = 128,
1493
948
.arg = "SECONDS",
1494
949
.doc = "Maximum delay to wait for interface startup",
1495
950
.group = 2 },
1496
{ .name = "retry", .key = 132,
1497
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
1499
.group = 2 },
1500
{ .name = "network-hook-dir", .key = 133,
1501
.arg = "DIR",
1502
.doc = "Directory where network hooks are located",
1503
.group = 2 },
1504
/*
1505
* These reproduce what we would get without ARGP_NO_HELP
1506
*/
1507
{ .name = "help", .key = '?',
1508
.doc = "Give this help list", .group = -1 },
1509
{ .name = "usage", .key = -3,
1510
.doc = "Give a short usage message", .group = -1 },
1511
{ .name = "version", .key = 'V',
1512
.doc = "Print program version", .group = -1 },
1513
951
{ .name = NULL }
1514
952
};
1515
953
1516
954
error_t parse_opt(int key, char *arg,
1517
955
struct argp_state *state){
1518
errno = 0;
1519
956
switch(key){
1520
957
case 128: /* --debug */
1521
958
debug = true;
1537
974
tmpmax = strtoimax(arg, &tmp, 10);
1538
975
if(errno != 0 or tmp == arg or *tmp != '\0'
1539
976
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1540
argp_error(state, "Bad number of DH bits");
977
fprintf(stderr, "Bad number of DH bits\n");
978
exit(EXIT_FAILURE);
1541
979
}
1542
980
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1543
981
break;
1548
986
errno = 0;
1549
987
delay = strtof(arg, &tmp);
1550
988
if(errno != 0 or tmp == arg or *tmp != '\0'){
1551
argp_error(state, "Bad delay");
1552
}
1553
case 132: /* --retry */
1554
errno = 0;
1555
retry_interval = strtod(arg, &tmp);
1556
if(errno != 0 or tmp == arg or *tmp != '\0'
1557
or (retry_interval * 1000) > INT_MAX
1558
or retry_interval < 0){
1559
argp_error(state, "Bad retry interval");
1560
}
1561
break;
1562
case 133: /* --network-hook-dir */
1563
hookdir = arg;
1564
break;
1565
/*
1566
* These reproduce what we would get without ARGP_NO_HELP
1567
*/
1568
case '?': /* --help */
1569
argp_state_help(state, state->out_stream,
1570
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1571
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1572
case -3: /* --usage */
1573
argp_state_help(state, state->out_stream,
1574
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
1578
exit(argp_err_exit_status);
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
991
}
992
break;
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
1579
996
break;
1580
997
default:
1581
998
return ARGP_ERR_UNKNOWN;
1582
999
}
1583
return errno;
1000
return 0;
1584
1001
}
1585
1002
1586
1003
struct argp argp = { .options = options, .parser = parse_opt,
1587
1004
.args_doc = "",
1588
1005
.doc = "Mandos client -- Get and decrypt"
1589
1006
" passwords from a Mandos server" };
1590
ret = argp_parse(&argp, argc, argv,
1591
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1592
switch(ret){
1593
case 0:
1594
break;
1595
case ENOMEM:
1596
default:
1597
errno = ret;
1598
perror_plus("argp_parse");
1599
exitcode = EX_OSERR;
1600
goto end;
1601
case EINVAL:
1602
exitcode = EX_USAGE;
1603
goto end;
1604
}
1605
}
1606
1607
{
1608
/* Work around Debian bug #633582:
1609
<http://bugs.debian.org/633582> */
1610
struct stat st;
1611
1612
/* Re-raise priviliges */
1613
errno = 0;
1614
ret = seteuid(0);
1615
if(ret == -1){
1616
perror_plus("seteuid");
1617
}
1618
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1623
} else {
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1625
if(ret == -1){
1626
perror_plus("fstat");
1627
} else {
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1630
if(ret == -1){
1631
perror_plus("fchown");
1632
}
1633
}
1634
}
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1636
}
1637
}
1638
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1643
} else {
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1645
if(ret == -1){
1646
perror_plus("fstat");
1647
} else {
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1650
if(ret == -1){
1651
perror_plus("fchown");
1652
}
1653
}
1654
}
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1656
}
1657
}
1658
1659
/* Lower privileges */
1660
errno = 0;
1661
ret = seteuid(uid);
1662
if(ret == -1){
1663
perror_plus("seteuid");
1664
}
1665
}
1666
1667
/* Find network hooks and run them */
1668
{
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1672
alphasort);
1673
if(numhooks == -1){
1674
perror_plus("scandir");
1675
} else {
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1681
if(ret < 0){
1682
perror_plus("asprintf");
1683
continue;
1684
}
1685
pid_t hook_pid = fork();
1686
if(hook_pid == 0){
1687
/* Child */
1688
dup2(devnull, STDIN_FILENO);
1689
close(devnull);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("DEVICE", interface, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("MODE", "start", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
char *delaystring;
1707
ret = asprintf(&delaystring, "%f", delay);
1708
if(ret == -1){
1709
perror_plus("asprintf");
1710
exit(1);
1711
}
1712
ret = setenv("DELAY", delaystring, 1);
1713
if(ret == -1){
1714
free(delaystring);
1715
perror_plus("setenv");
1716
exit(1);
1717
}
1718
free(delaystring);
1719
ret = execl(fullname, direntry->d_name, "start", NULL);
1720
perror_plus("execl");
1721
} else {
1722
int status;
1723
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1724
perror_plus("waitpid");
1725
free(fullname);
1726
continue;
1727
}
1728
if(WIFEXITED(status)){
1729
if(WEXITSTATUS(status) != 0){
1730
fprintf(stderr, "Mandos plugin mandos-client: "
1731
"Warning: network hook \"%s\" exited"
1732
" with status %d\n", direntry->d_name,
1733
WEXITSTATUS(status));
1734
free(fullname);
1735
continue;
1736
}
1737
} else if(WIFSIGNALED(status)){
1738
fprintf(stderr, "Mandos plugin mandos-client: "
1739
"Warning: network hook \"%s\" died by"
1740
" signal %d\n", direntry->d_name,
1741
WTERMSIG(status));
1742
free(fullname);
1743
continue;
1744
} else {
1745
fprintf(stderr, "Mandos plugin mandos-client: "
1746
"Warning: network hook \"%s\" crashed\n",
1747
direntry->d_name);
1748
free(fullname);
1749
continue;
1750
}
1751
}
1752
free(fullname);
1753
if(quit_now){
1754
goto end;
1755
}
1756
}
1757
close(devnull);
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1011
goto end;
1758
1012
}
1759
1013
}
1760
1014
1762
1016
avahi_set_log_function(empty_log);
1763
1017
}
1764
1018
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf(stderr, "Mandos plugin mandos-client: "
1781
"Using interface \"%s\"\n", interface);
1782
}
1783
if(interface == NULL){
1784
perror_plus("malloc");
1785
free(direntries);
1786
exitcode = EXIT_FAILURE;
1787
goto end;
1788
}
1789
free(direntries);
1790
} else {
1791
free(direntries);
1792
fprintf(stderr, "Mandos plugin mandos-client: "
1793
"Could not find a network interface\n");
1794
exitcode = EXIT_FAILURE;
1795
goto end;
1796
}
1797
}
1798
1799
1019
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1800
1020
from the signal handler */
1801
1021
/* Initialize the pseudo-RNG for Avahi */
1802
1022
srand((unsigned int) time(NULL));
1803
1023
mc.simple_poll = avahi_simple_poll_new();
1804
1024
if(mc.simple_poll == NULL){
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Avahi: Failed to create simple poll object.\n");
1807
exitcode = EX_UNAVAILABLE;
1025
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1026
exitcode = EXIT_FAILURE;
1808
1027
goto end;
1809
1028
}
1810
1029
1811
1030
sigemptyset(&sigterm_action.sa_mask);
1812
1031
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1813
1032
if(ret == -1){
1814
perror_plus("sigaddset");
1815
exitcode = EX_OSERR;
1033
perror("sigaddset");
1034
exitcode = EXIT_FAILURE;
1816
1035
goto end;
1817
1036
}
1818
1037
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1819
1038
if(ret == -1){
1820
perror_plus("sigaddset");
1821
exitcode = EX_OSERR;
1039
perror("sigaddset");
1040
exitcode = EXIT_FAILURE;
1822
1041
goto end;
1823
1042
}
1824
1043
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1825
1044
if(ret == -1){
1826
perror_plus("sigaddset");
1827
exitcode = EX_OSERR;
1828
goto end;
1829
}
1830
/* Need to check if the handler is SIG_IGN before handling:
1831
| [[info:libc:Initial Signal Actions]] |
1832
| [[info:libc:Basic Signal Handling]] |
1833
*/
1834
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1835
if(ret == -1){
1836
perror_plus("sigaction");
1837
return EX_OSERR;
1838
}
1839
if(old_sigterm_action.sa_handler != SIG_IGN){
1840
ret = sigaction(SIGINT, &sigterm_action, NULL);
1841
if(ret == -1){
1842
perror_plus("sigaction");
1843
exitcode = EX_OSERR;
1844
goto end;
1845
}
1846
}
1847
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1848
if(ret == -1){
1849
perror_plus("sigaction");
1850
return EX_OSERR;
1851
}
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1854
if(ret == -1){
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1857
goto end;
1858
}
1859
}
1860
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1861
if(ret == -1){
1862
perror_plus("sigaction");
1863
return EX_OSERR;
1864
}
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1867
if(ret == -1){
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
}
1872
}
1045
perror("sigaddset");
1046
exitcode = EXIT_FAILURE;
1047
goto end;
1048
}
1049
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1050
if(ret == -1){
1051
perror("sigaction");
1052
exitcode = EXIT_FAILURE;
1053
goto end;
1054
}
1873
1055
1874
1056
/* If the interface is down, bring it up */
1875
if(strcmp(interface, "none") != 0){
1876
if_index = (AvahiIfIndex) if_nametoindex(interface);
1877
if(if_index == 0){
1878
fprintf(stderr, "Mandos plugin mandos-client: "
1879
"No such interface: \"%s\"\n", interface);
1880
exitcode = EX_UNAVAILABLE;
1881
goto end;
1882
}
1883
1884
if(quit_now){
1885
goto end;
1886
}
1887
1888
/* Re-raise priviliges */
1889
errno = 0;
1890
ret = seteuid(0);
1891
if(ret == -1){
1892
perror_plus("seteuid");
1893
}
1894
1057
if(interface[0] != '\0'){
1895
1058
#ifdef __linux__
1896
1059
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1897
messages about the network interface to mess up the prompt */
1060
messages to mess up the prompt */
1898
1061
ret = klogctl(8, NULL, 5);
1899
1062
bool restore_loglevel = true;
1900
1063
if(ret == -1){
1901
1064
restore_loglevel = false;
1902
perror_plus("klogctl");
1065
perror("klogctl");
1903
1066
}
1904
1067
#endif /* __linux__ */
1905
1068
1906
1069
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1907
1070
if(sd < 0){
1908
perror_plus("socket");
1909
exitcode = EX_OSERR;
1071
perror("socket");
1072
exitcode = EXIT_FAILURE;
1910
1073
#ifdef __linux__
1911
1074
if(restore_loglevel){
1912
1075
ret = klogctl(7, NULL, 0);
1913
1076
if(ret == -1){
1914
perror_plus("klogctl");
1077
perror("klogctl");
1915
1078
}
1916
1079
}
1917
1080
#endif /* __linux__ */
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1924
1081
goto end;
1925
1082
}
1926
1083
strcpy(network.ifr_name, interface);
1927
1084
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1928
1085
if(ret == -1){
1929
perror_plus("ioctl SIOCGIFFLAGS");
1086
perror("ioctl SIOCGIFFLAGS");
1930
1087
#ifdef __linux__
1931
1088
if(restore_loglevel){
1932
1089
ret = klogctl(7, NULL, 0);
1933
1090
if(ret == -1){
1934
perror_plus("klogctl");
1091
perror("klogctl");
1935
1092
}
1936
1093
}
1937
1094
#endif /* __linux__ */
1938
exitcode = EX_OSERR;
1939
/* Lower privileges */
1940
errno = 0;
1941
ret = seteuid(uid);
1942
if(ret == -1){
1943
perror_plus("seteuid");
1944
}
1095
exitcode = EXIT_FAILURE;
1945
1096
goto end;
1946
1097
}
1947
1098
if((network.ifr_flags & IFF_UP) == 0){
1948
1099
network.ifr_flags |= IFF_UP;
1949
take_down_interface = true;
1950
1100
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1951
1101
if(ret == -1){
1952
take_down_interface = false;
1953
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1954
exitcode = EX_OSERR;
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1955
1104
#ifdef __linux__
1956
1105
if(restore_loglevel){
1957
1106
ret = klogctl(7, NULL, 0);
1958
1107
if(ret == -1){
1959
perror_plus("klogctl");
1108
perror("klogctl");
1960
1109
}
1961
1110
}
1962
1111
#endif /* __linux__ */
1963
/* Lower privileges */
1964
errno = 0;
1965
ret = seteuid(uid);
1966
if(ret == -1){
1967
perror_plus("seteuid");
1968
}
1969
1112
goto end;
1970
1113
}
1971
1114
}
1972
/* Sleep checking until interface is running.
1973
Check every 0.25s, up to total time of delay */
1115
/* sleep checking until interface is running */
1974
1116
for(int i=0; i < delay * 4; i++){
1975
1117
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1976
1118
if(ret == -1){
1977
perror_plus("ioctl SIOCGIFFLAGS");
1119
perror("ioctl SIOCGIFFLAGS");
1978
1120
} else if(network.ifr_flags & IFF_RUNNING){
1979
1121
break;
1980
1122
}
1981
1123
struct timespec sleeptime = { .tv_nsec = 250000000 };
1982
1124
ret = nanosleep(&sleeptime, NULL);
1983
1125
if(ret == -1 and errno != EINTR){
1984
perror_plus("nanosleep");
1126
perror("nanosleep");
1985
1127
}
1986
1128
}
1987
if(not take_down_interface){
1988
/* We won't need the socket anymore */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1129
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1130
if(ret == -1){
1131
perror("close");
1993
1132
}
1994
1133
#ifdef __linux__
1995
1134
if(restore_loglevel){
1996
1135
/* Restores kernel loglevel to default */
1997
1136
ret = klogctl(7, NULL, 0);
1998
1137
if(ret == -1){
1999
perror_plus("klogctl");
1138
perror("klogctl");
2000
1139
}
2001
1140
}
2002
1141
#endif /* __linux__ */
2003
/* Lower privileges */
2004
errno = 0;
2005
if(take_down_interface){
2006
/* Lower privileges */
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2010
}
2011
} else {
2012
/* Lower privileges permanently */
2013
ret = setuid(uid);
2014
if(ret == -1){
2015
perror_plus("setuid");
2016
}
2017
}
2018
}
2019
2020
if(quit_now){
2021
goto end;
1142
}
1143
1144
uid = getuid();
1145
gid = getgid();
1146
1147
errno = 0;
1148
setgid(gid);
1149
if(ret == -1){
1150
perror("setgid");
1151
}
1152
1153
ret = setuid(uid);
1154
if(ret == -1){
1155
perror("setuid");
2022
1156
}
2023
1157
2024
1158
ret = init_gnutls_global(pubkey, seckey);
2025
1159
if(ret == -1){
2026
fprintf(stderr, "Mandos plugin mandos-client: "
2027
"init_gnutls_global failed\n");
2028
exitcode = EX_UNAVAILABLE;
1160
fprintf(stderr, "init_gnutls_global failed\n");
1161
exitcode = EXIT_FAILURE;
2029
1162
goto end;
2030
1163
} else {
2031
1164
gnutls_initialized = true;
2032
1165
}
2033
1166
2034
if(quit_now){
2035
goto end;
2036
}
2037
2038
1167
if(mkdtemp(tempdir) == NULL){
2039
perror_plus("mkdtemp");
1168
perror("mkdtemp");
2040
1169
goto end;
2041
1170
}
2042
1171
tempdir_created = true;
2043
1172
2044
if(quit_now){
2045
goto end;
2046
}
2047
2048
1173
if(not init_gpgme(pubkey, seckey, tempdir)){
2049
fprintf(stderr, "Mandos plugin mandos-client: "
2050
"init_gpgme failed\n");
2051
exitcode = EX_UNAVAILABLE;
1174
fprintf(stderr, "init_gpgme failed\n");
1175
exitcode = EXIT_FAILURE;
2052
1176
goto end;
2053
1177
} else {
2054
1178
gpgme_initialized = true;
2055
1179
}
2056
1180
2057
if(quit_now){
2058
goto end;
1181
if(interface[0] != '\0'){
1182
if_index = (AvahiIfIndex) if_nametoindex(interface);
1183
if(if_index == 0){
1184
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
2059
1188
}
2060
1189
2061
1190
if(connect_to != NULL){
2063
1192
/* (Mainly meant for debugging) */
2064
1193
char *address = strrchr(connect_to, ':');
2065
1194
if(address == NULL){
2066
fprintf(stderr, "Mandos plugin mandos-client: "
2067
"No colon in address\n");
2068
exitcode = EX_USAGE;
2069
goto end;
2070
}
2071
2072
if(quit_now){
2073
goto end;
2074
}
2075
1195
fprintf(stderr, "No colon in address\n");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
2076
1199
uint16_t port;
2077
1200
errno = 0;
2078
1201
tmpmax = strtoimax(address+1, &tmp, 10);
2079
1202
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2080
1203
or tmpmax != (uint16_t)tmpmax){
2081
fprintf(stderr, "Mandos plugin mandos-client: "
2082
"Bad port number\n");
2083
exitcode = EX_USAGE;
2084
goto end;
2085
}
2086
2087
if(quit_now){
2088
goto end;
2089
}
2090
1204
fprintf(stderr, "Bad port number\n");
1205
exitcode = EXIT_FAILURE;
1206
goto end;
1207
}
2091
1208
port = (uint16_t)tmpmax;
2092
1209
*address = '\0';
1210
address = connect_to;
2093
1211
/* Colon in address indicates IPv6 */
2094
1212
int af;
2095
if(strchr(connect_to, ':') != NULL){
1213
if(strchr(address, ':') != NULL){
2096
1214
af = AF_INET6;
2097
/* Accept [] around IPv6 address - see RFC 5952 */
2098
if(connect_to[0] == '[' and address[-1] == ']')
2099
{
2100
connect_to++;
2101
address[-1] = '\0';
2102
}
2103
1215
} else {
2104
1216
af = AF_INET;
2105
1217
}
2106
address = connect_to;
2107
2108
if(quit_now){
2109
goto end;
2110
}
2111
2112
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2114
if(quit_now or ret == 0){
2115
break;
2116
}
2117
if(debug){
2118
fprintf(stderr, "Mandos plugin mandos-client: "
2119
"Retrying in %d seconds\n", (int)retry_interval);
2120
}
2121
sleep((int)retry_interval);
2122
}
2123
2124
if (not quit_now){
1218
ret = start_mandos_communication(address, port, if_index, af);
1219
if(ret < 0){
1220
exitcode = EXIT_FAILURE;
1221
} else {
2125
1222
exitcode = EXIT_SUCCESS;
2126
1223
}
1224
goto end;
1225
}
2127
1226
2128
goto end;
2129
}
2130
2131
if(quit_now){
2132
goto end;
2133
}
2134
2135
1227
{
2136
1228
AvahiServerConfig config;
2137
1229
/* Do not publish any local Zeroconf records */
2152
1244
2153
1245
/* Check if creating the Avahi server object succeeded */
2154
1246
if(mc.server == NULL){
2155
fprintf(stderr, "Mandos plugin mandos-client: "
2156
"Failed to create Avahi server: %s\n",
1247
fprintf(stderr, "Failed to create Avahi server: %s\n",
2157
1248
avahi_strerror(error));
2158
exitcode = EX_UNAVAILABLE;
2159
goto end;
2160
}
2161
2162
if(quit_now){
1249
exitcode = EXIT_FAILURE;
2163
1250
goto end;
2164
1251
}
2165
1252
2168
1255
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2169
1256
NULL, 0, browse_callback, NULL);
2170
1257
if(sb == NULL){
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"Failed to create service browser: %s\n",
1258
fprintf(stderr, "Failed to create service browser: %s\n",
2173
1259
avahi_strerror(avahi_server_errno(mc.server)));
2174
exitcode = EX_UNAVAILABLE;
2175
goto end;
2176
}
2177
2178
if(quit_now){
1260
exitcode = EXIT_FAILURE;
2179
1261
goto end;
2180
1262
}
2181
1263
2182
1264
/* Run the main loop */
2183
1265
2184
1266
if(debug){
2185
fprintf(stderr, "Mandos plugin mandos-client: "
2186
"Starting Avahi loop search\n");
2187
}
2188
2189
ret = avahi_loop_with_timeout(mc.simple_poll,
2190
(int)(retry_interval * 1000));
2191
if(debug){
2192
fprintf(stderr, "Mandos plugin mandos-client: "
2193
"avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2195
}
1267
fprintf(stderr, "Starting Avahi loop search\n");
1268
}
1269
1270
avahi_simple_poll_loop(mc.simple_poll);
2196
1271
2197
1272
end:
2198
1273
2199
1274
if(debug){
2200
fprintf(stderr, "Mandos plugin mandos-client: "
2201
"%s exiting\n", argv[0]);
1275
fprintf(stderr, "%s exiting\n", argv[0]);
2202
1276
}
2203
1277
2204
1278
/* Cleanup things */
2220
1294
if(gpgme_initialized){
2221
1295
gpgme_release(mc.ctx);
2222
1296
}
2223
2224
/* Cleans up the circular linked list of Mandos servers the client
2225
has seen */
2226
if(mc.current_server != NULL){
2227
mc.current_server->prev->next = NULL;
2228
while(mc.current_server != NULL){
2229
server *next = mc.current_server->next;
2230
free(mc.current_server);
2231
mc.current_server = next;
2232
}
2233
}
2234
2235
/* XXX run network hooks "stop" here */
2236
2237
/* Take down the network interface */
2238
if(take_down_interface){
2239
/* Re-raise priviliges */
2240
errno = 0;
2241
ret = seteuid(0);
2242
if(ret == -1){
2243
perror_plus("seteuid");
2244
}
2245
if(geteuid() == 0){
2246
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCGIFFLAGS");
2249
} else if(network.ifr_flags & IFF_UP){
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2254
}
2255
}
2256
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
if(ret == -1){
2258
perror_plus("close");
2259
}
2260
/* Lower privileges permanently */
2261
errno = 0;
2262
ret = setuid(uid);
2263
if(ret == -1){
2264
perror_plus("setuid");
2265
}
2266
}
2267
}
2268
2269
/* Removes the GPGME temp directory and all files inside */
1297
1298
/* Removes the temp directory used by GPGME */
2270
1299
if(tempdir_created){
2271
struct dirent **direntries = NULL;
2272
struct dirent *direntry = NULL;
2273
int numentries = scandir(tempdir, &direntries, notdotentries,
2274
alphasort);
2275
if (numentries > 0){
2276
for(int i = 0; i < numentries; i++){
2277
direntry = direntries[i];
1300
DIR *d;
1301
struct dirent *direntry;
1302
d = opendir(tempdir);
1303
if(d == NULL){
1304
if(errno != ENOENT){
1305
perror("opendir");
1306
}
1307
} else {
1308
while(true){
1309
direntry = readdir(d);
1310
if(direntry == NULL){
1311
break;
1312
}
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1318
continue;
1319
}
2278
1320
char *fullname = NULL;
2279
1321
ret = asprintf(&fullname, "%s/%s", tempdir,
2280
1322
direntry->d_name);
2281
1323
if(ret < 0){
2282
perror_plus("asprintf");
1324
perror("asprintf");
2283
1325
continue;
2284
1326
}
2285
1327
ret = remove(fullname);
2286
1328
if(ret == -1){
2287
fprintf(stderr, "Mandos plugin mandos-client: "
2288
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1329
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1330
strerror(errno));
2289
1331
}
2290
1332
free(fullname);
2291
1333
}
2292
}
2293
2294
/* need to clean even if 0 because man page doesn't specify */
2295
free(direntries);
2296
if (numentries == -1){
2297
perror_plus("scandir");
1334
closedir(d);
2298
1335
}
2299
1336
ret = rmdir(tempdir);
2300
1337
if(ret == -1 and errno != ENOENT){
2301
perror_plus("rmdir");
2302
}
2303
}
2304
2305
if(quit_now){
2306
sigemptyset(&old_sigterm_action.sa_mask);
2307
old_sigterm_action.sa_handler = SIG_DFL;
2308
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2309
&old_sigterm_action,
2310
NULL));
2311
if(ret == -1){
2312
perror_plus("sigaction");
2313
}
2314
do {
2315
ret = raise(signal_received);
2316
} while(ret != 0 and errno == EINTR);
2317
if(ret != 0){
2318
perror_plus("raise");
2319
abort();
2320
}
2321
TEMP_FAILURE_RETRY(pause());
1338
perror("rmdir");
1339
}
2322
1340
}
2323
1341
2324
1342
return exitcode;
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Version: 2.0.2.dev0