(root)/mandos/release
» Revision
237.2.125
(compared to revision 237.7.149)
: plugins.d/mandos-client.c
To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 237.2.125
- compare with another revision
- download diff
- download tarball
- view history from revision 237.2.125
- Committer: Teddy Hogeborn
- Date: 2009-09-06 05:37:34 UTC
- mto: (24.1.140 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-20090906053734-uf180lq30ivv4nfy
* plugin-runner.c (getplugin, add_environment, main): Handle EINTR
properly.
* plugins.d/mandos-client.c (start_mandos_communication): Bug fix:
move out "decrypted_buffer_size" to where it is needed.
* plugins.d/splashy.c (termination_handler): Save signal received.
(main): Check return value from "sigaddset()".
properly.
* plugins.d/mandos-client.c (start_mandos_communication): Bug fix:
move out "decrypted_buffer_size" to where it is needed.
* plugins.d/splashy.c (termination_handler): Save signal received.
(main): Check return value from "sigaddset()".
- 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() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
69
69
if_nametoindex(), IF_NAMESIZE */
71
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
77
#include <iso646.h> /* not, or, and */
78
78
#include <argp.h> /* struct argp_option, error_t, struct
79
79
argp_state, struct argp,
82
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
83
sigaction(), SIGTERM, sig_atomic_t,
84
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
94
85
95
86
#ifdef __linux__
96
87
#include <sys/klog.h> /* klogctl() */
114
105
init_gnutls_session(),
115
106
GNUTLS_* */
116
107
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
119
110
120
111
/* GPGME */
121
112
#include <gpgme.h> /* All GPGME types, constants and
129
120
#define PATHDIR "/conf/conf.d/mandos"
130
121
#define SECKEY "seckey.txt"
131
122
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
123
134
124
bool debug = false;
135
125
static const char mandos_protocol_version[] = "1";
136
126
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
154
128
155
129
/* Used for passing in values through the Avahi callback functions */
156
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
157
132
AvahiServer *server;
158
133
gnutls_certificate_credentials_t cred;
159
134
unsigned int dh_bits;
160
135
gnutls_dh_params_t dh_params;
161
136
const char *priority;
162
137
gpgme_ctx_t ctx;
163
server *current_server;
164
138
} mandos_context;
165
139
166
/* global so signal handler can reach it*/
167
AvahiSimplePoll *simple_poll;
168
mandos_context mc = { .server = NULL, .dh_bits = 1024,
169
.priority = "SECURE256:!CTYPE-X.509:"
170
"+CTYPE-OPENPGP", .current_server = NULL };
171
172
sig_atomic_t quit_now = 0;
173
int signal_received = 0;
174
175
/* Function to use when printing errors */
176
void perror_plus(const char *print_text){
177
int e = errno;
178
fprintf(stderr, "Mandos plugin %s: ",
179
program_invocation_short_name);
180
errno = e;
181
perror(print_text);
182
}
183
184
__attribute__((format (gnu_printf, 2, 3)))
185
int fprintf_plus(FILE *stream, const char *format, ...){
186
va_list ap;
187
va_start (ap, format);
188
189
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
190
program_invocation_short_name));
191
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
}
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
193
144
194
145
/*
195
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
197
148
* "buffer_length" is how much is already used.
198
149
*/
199
150
size_t incbuffer(char **buffer, size_t buffer_length,
200
size_t buffer_capacity){
151
size_t buffer_capacity){
201
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
202
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
203
154
if(buffer == NULL){
208
159
return buffer_capacity;
209
160
}
210
161
211
/* Add server to set of servers to retry periodically */
212
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
213
int af){
214
int ret;
215
server *new_server = malloc(sizeof(server));
216
if(new_server == NULL){
217
perror_plus("malloc");
218
return false;
219
}
220
*new_server = (server){ .ip = strdup(ip),
221
.port = port,
222
.if_index = if_index,
223
.af = af };
224
if(new_server->ip == NULL){
225
perror_plus("strdup");
226
return false;
227
}
228
/* Special case of first server */
229
if (mc.current_server == NULL){
230
new_server->next = new_server;
231
new_server->prev = new_server;
232
mc.current_server = new_server;
233
/* Place the new server last in the list */
234
} else {
235
new_server->next = mc.current_server;
236
new_server->prev = mc.current_server->prev;
237
new_server->prev->next = new_server;
238
mc.current_server->prev = new_server;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
return false;
244
}
245
return true;
246
}
247
248
162
/*
249
163
* Initialize GPGME.
250
164
*/
251
static bool init_gpgme(const char *seckey, const char *pubkey,
252
const char *tempdir){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
253
167
gpgme_error_t rc;
254
168
gpgme_engine_info_t engine_info;
255
169
170
256
171
/*
257
172
* Helper function to insert pub and seckey to the engine keyring.
258
173
*/
263
178
264
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
265
180
if(fd == -1){
266
perror_plus("open");
181
perror("open");
267
182
return false;
268
183
}
269
184
270
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
271
186
if(rc != GPG_ERR_NO_ERROR){
272
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
273
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));
274
189
return false;
275
190
}
276
191
277
192
rc = gpgme_op_import(mc.ctx, pgp_data);
278
193
if(rc != GPG_ERR_NO_ERROR){
279
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
281
196
return false;
282
197
}
283
198
284
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
285
200
if(ret == -1){
286
perror_plus("close");
201
perror("close");
287
202
}
288
203
gpgme_data_release(pgp_data);
289
204
return true;
290
205
}
291
206
292
207
if(debug){
293
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
294
209
}
295
210
296
211
/* Init GPGME */
297
212
gpgme_check_version(NULL);
298
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
299
214
if(rc != GPG_ERR_NO_ERROR){
300
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
302
217
return false;
303
218
}
304
219
305
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
306
221
rc = gpgme_get_engine_info(&engine_info);
307
222
if(rc != GPG_ERR_NO_ERROR){
308
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
310
225
return false;
311
226
}
312
227
while(engine_info != NULL){
318
233
engine_info = engine_info->next;
319
234
}
320
235
if(engine_info == NULL){
321
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
322
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
323
237
return false;
324
238
}
325
239
326
240
/* Create new GPGME "context" */
327
241
rc = gpgme_new(&(mc.ctx));
328
242
if(rc != GPG_ERR_NO_ERROR){
329
fprintf_plus(stderr, "Mandos plugin mandos-client: "
330
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
331
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
332
245
return false;
333
246
}
334
247
353
266
ssize_t plaintext_length = 0;
354
267
355
268
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
357
270
}
358
271
359
272
/* Create new GPGME data buffer from memory cryptotext */
360
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
361
274
0);
362
275
if(rc != GPG_ERR_NO_ERROR){
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
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));
365
278
return -1;
366
279
}
367
280
368
281
/* Create new empty GPGME data buffer for the plaintext */
369
282
rc = gpgme_data_new(&dh_plain);
370
283
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
374
286
gpgme_data_release(dh_crypto);
375
287
return -1;
376
288
}
379
291
data buffer */
380
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
293
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
384
296
plaintext_length = -1;
385
297
if(debug){
386
298
gpgme_decrypt_result_t result;
387
299
result = gpgme_op_decrypt_result(mc.ctx);
388
300
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
390
302
} else {
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
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);
395
307
if(result->file_name != NULL){
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
397
309
}
398
310
gpgme_recipient_t recipient;
399
311
recipient = result->recipients;
400
312
while(recipient != NULL){
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
408
319
recipient = recipient->next;
409
320
}
410
321
}
413
324
}
414
325
415
326
if(debug){
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
328
}
418
329
419
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
422
333
plaintext_length = -1;
423
334
goto decrypt_end;
424
335
}
426
337
*plaintext = NULL;
427
338
while(true){
428
339
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
431
342
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
435
346
}
436
347
437
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
442
353
break;
443
354
}
444
355
if(ret < 0){
445
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
446
357
plaintext_length = -1;
447
358
goto decrypt_end;
448
359
}
450
361
}
451
362
452
363
if(debug){
453
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
454
365
for(ssize_t i = 0; i < plaintext_length; i++){
455
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
367
}
468
379
}
469
380
470
381
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
472
384
if(ret == NULL)
473
385
ret = "(unknown)";
474
386
return ret;
477
389
/* GnuTLS log function callback */
478
390
static void debuggnutls(__attribute__((unused)) int level,
479
391
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
481
393
}
482
394
483
395
static int init_gnutls_global(const char *pubkeyfilename,
485
397
int ret;
486
398
487
399
if(debug){
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
489
401
}
490
402
491
403
ret = gnutls_global_init();
492
404
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
495
407
return -1;
496
408
}
497
409
504
416
}
505
417
506
418
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
508
420
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
511
426
gnutls_global_deinit();
512
427
return -1;
513
428
}
514
429
515
430
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);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
520
434
}
521
435
522
436
ret = gnutls_certificate_set_openpgp_key_file
523
437
(mc.cred, pubkeyfilename, seckeyfilename,
524
438
GNUTLS_OPENPGP_FMT_BASE64);
525
439
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));
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
531
445
goto globalfail;
532
446
}
533
447
534
448
/* GnuTLS server initialization */
535
449
ret = gnutls_dh_params_init(&mc.dh_params);
536
450
if(ret != GNUTLS_E_SUCCESS){
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
540
453
goto globalfail;
541
454
}
542
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
456
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
546
459
goto globalfail;
547
460
}
548
461
561
474
static int init_gnutls_session(gnutls_session_t *session){
562
475
int ret;
563
476
/* 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);
477
ret = gnutls_init(session, GNUTLS_SERVER);
570
478
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
574
481
}
575
482
576
483
{
577
484
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);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
585
486
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));
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
589
490
gnutls_deinit(*session);
590
491
return -1;
591
492
}
592
493
}
593
494
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);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
602
497
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
605
500
gnutls_deinit(*session);
606
501
return -1;
607
502
}
608
503
609
504
/* ignore client certificate if any. */
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
611
507
612
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
509
618
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
619
515
__attribute__((unused)) const char *txt){}
620
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
621
520
/* Called when a Mandos server is found */
622
static int start_mandos_communication(const char *ip, in_port_t port,
521
static int start_mandos_communication(const char *ip, uint16_t port,
623
522
AvahiIfIndex if_index,
624
523
int af){
625
524
int ret, tcp_sd = -1;
629
528
struct sockaddr_in6 in6;
630
529
} to;
631
530
char *buffer = NULL;
632
char *decrypted_buffer = NULL;
531
char *decrypted_buffer;
633
532
size_t buffer_length = 0;
634
533
size_t buffer_capacity = 0;
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
539
if(quit_now){
643
errno = EINTR;
644
540
return -1;
645
541
}
646
542
652
548
pf = PF_INET;
653
549
break;
654
550
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
656
errno = EINVAL;
551
fprintf(stderr, "Bad address family: %d\n", af);
657
552
return -1;
658
553
}
659
554
663
558
}
664
559
665
560
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIuMAX "\n", ip, (uintmax_t)port);
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
562
"\n", ip, port);
668
563
}
669
564
670
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
566
if(tcp_sd < 0){
672
int e = errno;
673
perror_plus("socket");
674
errno = e;
567
perror("socket");
568
retval = -1;
675
569
goto mandos_end;
676
570
}
677
571
678
572
if(quit_now){
679
errno = EINTR;
680
573
goto mandos_end;
681
574
}
682
575
689
582
ret = inet_pton(af, ip, &to.in.sin_addr);
690
583
}
691
584
if(ret < 0 ){
692
int e = errno;
693
perror_plus("inet_pton");
694
errno = e;
585
perror("inet_pton");
586
retval = -1;
695
587
goto mandos_end;
696
588
}
697
589
if(ret == 0){
698
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
700
errno = e;
590
fprintf(stderr, "Bad address: %s\n", ip);
591
retval = -1;
701
592
goto mandos_end;
702
593
}
703
594
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
595
to.in6.sin6_port = htons(port); /* Spurious warnings from
596
-Wconversion and
597
-Wunreachable-code */
598
705
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
601
-Wunreachable-code*/
708
602
if(if_index == AVAHI_IF_UNSPEC){
709
fprintf_plus(stderr, "An IPv6 link-local address is"
710
" incomplete without a network interface\n");
711
errno = EINVAL;
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
605
retval = -1;
712
606
goto mandos_end;
713
607
}
714
608
/* Set the network interface number as scope */
721
615
}
722
616
723
617
if(quit_now){
724
errno = EINTR;
725
618
goto mandos_end;
726
619
}
727
620
729
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
730
623
char interface[IF_NAMESIZE];
731
624
if(if_indextoname((unsigned int)if_index, interface) == NULL){
732
perror_plus("if_indextoname");
625
perror("if_indextoname");
733
626
} else {
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
736
629
}
737
630
} else {
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
740
633
}
741
634
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
635
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
749
642
sizeof(addrstr));
750
643
}
751
644
if(pcret == NULL){
752
perror_plus("inet_ntop");
645
perror("inet_ntop");
753
646
} else {
754
647
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
648
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
649
}
757
650
}
758
651
}
759
652
760
653
if(quit_now){
761
errno = EINTR;
762
654
goto mandos_end;
763
655
}
764
656
768
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
661
}
770
662
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
663
perror("connect");
664
retval = -1;
776
665
goto mandos_end;
777
666
}
778
667
779
668
if(quit_now){
780
errno = EINTR;
781
669
goto mandos_end;
782
670
}
783
671
786
674
while(true){
787
675
size_t out_size = strlen(out);
788
676
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
789
out_size - written));
677
out_size - written));
790
678
if(ret == -1){
791
int e = errno;
792
perror_plus("write");
793
errno = e;
679
perror("write");
680
retval = -1;
794
681
goto mandos_end;
795
682
}
796
683
written += (size_t)ret;
806
693
}
807
694
808
695
if(quit_now){
809
errno = EINTR;
810
696
goto mandos_end;
811
697
}
812
698
}
813
699
814
700
if(debug){
815
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
816
}
817
818
if(quit_now){
819
errno = EINTR;
820
goto mandos_end;
821
}
822
823
/* This casting via intptr_t is to eliminate warning about casting
824
an int to a pointer type. This is exactly how the GnuTLS Guile
825
function "set-session-transport-fd!" does it. */
826
gnutls_transport_set_ptr(session,
827
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
828
829
if(quit_now){
830
errno = EINTR;
831
goto mandos_end;
832
}
833
834
do {
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
702
}
703
704
if(quit_now){
705
goto mandos_end;
706
}
707
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
709
710
if(quit_now){
711
goto mandos_end;
712
}
713
714
do{
835
715
ret = gnutls_handshake(session);
836
716
if(quit_now){
837
errno = EINTR;
838
717
goto mandos_end;
839
718
}
840
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
841
720
842
721
if(ret != GNUTLS_E_SUCCESS){
843
722
if(debug){
844
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
723
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
845
724
gnutls_perror(ret);
846
725
}
847
errno = EPROTO;
726
retval = -1;
848
727
goto mandos_end;
849
728
}
850
729
851
730
/* Read OpenPGP packet that contains the wanted password */
852
731
853
732
if(debug){
854
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
855
" %s\n", ip);
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
734
ip);
856
735
}
857
736
858
737
while(true){
859
738
860
739
if(quit_now){
861
errno = EINTR;
862
740
goto mandos_end;
863
741
}
864
742
865
743
buffer_capacity = incbuffer(&buffer, buffer_length,
866
buffer_capacity);
744
buffer_capacity);
867
745
if(buffer_capacity == 0){
868
int e = errno;
869
perror_plus("incbuffer");
870
errno = e;
746
perror("incbuffer");
747
retval = -1;
871
748
goto mandos_end;
872
749
}
873
750
874
751
if(quit_now){
875
errno = EINTR;
876
752
goto mandos_end;
877
753
}
878
754
887
763
case GNUTLS_E_AGAIN:
888
764
break;
889
765
case GNUTLS_E_REHANDSHAKE:
890
do {
766
do{
891
767
ret = gnutls_handshake(session);
892
768
893
769
if(quit_now){
894
errno = EINTR;
895
770
goto mandos_end;
896
771
}
897
772
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
898
773
if(ret < 0){
899
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
900
"***\n");
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
775
gnutls_perror(ret);
902
errno = EPROTO;
776
retval = -1;
903
777
goto mandos_end;
904
778
}
905
779
break;
906
780
default:
907
fprintf_plus(stderr, "Unknown error while reading data from"
908
" encrypted session with Mandos server\n");
781
fprintf(stderr, "Unknown error while reading data from"
782
" encrypted session with Mandos server\n");
783
retval = -1;
909
784
gnutls_bye(session, GNUTLS_SHUT_RDWR);
910
errno = EIO;
911
785
goto mandos_end;
912
786
}
913
787
} else {
916
790
}
917
791
918
792
if(debug){
919
fprintf_plus(stderr, "Closing TLS session\n");
920
}
921
922
if(quit_now){
923
errno = EINTR;
924
goto mandos_end;
925
}
926
927
do {
928
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
929
if(quit_now){
930
errno = EINTR;
931
goto mandos_end;
932
}
933
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
793
fprintf(stderr, "Closing TLS session\n");
794
}
795
796
if(quit_now){
797
goto mandos_end;
798
}
799
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
802
if(quit_now){
803
goto mandos_end;
804
}
934
805
935
806
if(buffer_length > 0){
936
807
ssize_t decrypted_buffer_size;
937
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
809
buffer_length,
938
810
&decrypted_buffer);
939
811
if(decrypted_buffer_size >= 0){
940
812
941
813
written = 0;
942
814
while(written < (size_t) decrypted_buffer_size){
943
815
if(quit_now){
944
errno = EINTR;
945
816
goto mandos_end;
946
817
}
947
818
949
820
(size_t)decrypted_buffer_size - written,
950
821
stdout);
951
822
if(ret == 0 and ferror(stdout)){
952
int e = errno;
953
823
if(debug){
954
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
955
strerror(errno));
824
fprintf(stderr, "Error writing encrypted data: %s\n",
825
strerror(errno));
956
826
}
957
errno = e;
958
goto mandos_end;
827
retval = -1;
828
break;
959
829
}
960
830
written += (size_t)ret;
961
831
}
962
retval = 0;
832
free(decrypted_buffer);
833
} else {
834
retval = -1;
963
835
}
836
} else {
837
retval = -1;
964
838
}
965
839
966
840
/* Shutdown procedure */
967
841
968
842
mandos_end:
969
{
970
int e = errno;
971
free(decrypted_buffer);
972
free(buffer);
973
if(tcp_sd >= 0){
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
975
}
976
if(ret == -1){
977
if(e == 0){
978
e = errno;
979
}
980
perror_plus("close");
981
}
982
gnutls_deinit(session);
983
errno = e;
984
if(quit_now){
985
errno = EINTR;
986
retval = -1;
987
}
843
free(buffer);
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
847
if(ret == -1){
848
perror("close");
849
}
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
988
853
}
989
854
return retval;
990
855
}
1003
868
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
869
flags,
1005
870
AVAHI_GCC_UNUSED void* userdata){
1006
if(r == NULL){
1007
return;
1008
}
871
assert(r);
1009
872
1010
873
/* Called whenever a service has been resolved successfully or
1011
874
timed out */
1017
880
switch(event){
1018
881
default:
1019
882
case AVAHI_RESOLVER_FAILURE:
1020
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
domain,
1023
avahi_strerror(avahi_server_errno(mc.server)));
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
884
" of type '%s' in domain '%s': %s\n", name, type, domain,
885
avahi_strerror(avahi_server_errno(mc.server)));
1024
886
break;
1025
887
1026
888
case AVAHI_RESOLVER_FOUND:
1028
890
char ip[AVAHI_ADDRESS_STR_MAX];
1029
891
avahi_address_snprint(ip, sizeof(ip), address);
1030
892
if(debug){
1031
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1032
PRIdMAX ") on port %" PRIu16 "\n", name,
1033
host_name, ip, (intmax_t)interface, port);
893
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
ip, (intmax_t)interface, port);
1034
896
}
1035
int ret = start_mandos_communication(ip, (in_port_t)port,
1036
interface,
897
int ret = start_mandos_communication(ip, port, interface,
1037
898
avahi_proto_to_af(proto));
1038
899
if(ret == 0){
1039
avahi_simple_poll_quit(simple_poll);
1040
} else {
1041
if(not add_server(ip, (in_port_t)port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
900
avahi_simple_poll_quit(mc.simple_poll);
1046
901
}
1047
902
}
1048
903
}
1059
914
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1060
915
flags,
1061
916
AVAHI_GCC_UNUSED void* userdata){
1062
if(b == NULL){
1063
return;
1064
}
917
assert(b);
1065
918
1066
919
/* Called whenever a new services becomes available on the LAN or
1067
920
is removed from the LAN */
1074
927
default:
1075
928
case AVAHI_BROWSER_FAILURE:
1076
929
1077
fprintf_plus(stderr, "(Avahi browser) %s\n",
1078
avahi_strerror(avahi_server_errno(mc.server)));
1079
avahi_simple_poll_quit(simple_poll);
930
fprintf(stderr, "(Avahi browser) %s\n",
931
avahi_strerror(avahi_server_errno(mc.server)));
932
avahi_simple_poll_quit(mc.simple_poll);
1080
933
return;
1081
934
1082
935
case AVAHI_BROWSER_NEW:
1088
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1089
942
name, type, domain, protocol, 0,
1090
943
resolve_callback, NULL) == NULL)
1091
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1092
" %s\n", name,
1093
avahi_strerror(avahi_server_errno(mc.server)));
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
945
name, avahi_strerror(avahi_server_errno(mc.server)));
1094
946
break;
1095
947
1096
948
case AVAHI_BROWSER_REMOVE:
1099
951
case AVAHI_BROWSER_ALL_FOR_NOW:
1100
952
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1101
953
if(debug){
1102
fprintf_plus(stderr, "No Mandos server found, still"
1103
" searching...\n");
954
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
955
}
1105
956
break;
1106
957
}
1107
958
}
1108
959
1109
/* Signal handler that stops main loop after SIGTERM */
960
/* stop main loop after sigterm has been called */
1110
961
static void handle_sigterm(int sig){
1111
962
if(quit_now){
1112
963
return;
1114
965
quit_now = 1;
1115
966
signal_received = sig;
1116
967
int old_errno = errno;
1117
/* set main loop to exit */
1118
if(simple_poll != NULL){
1119
avahi_simple_poll_quit(simple_poll);
1120
}
1121
errno = old_errno;
1122
}
1123
1124
bool get_flags(const char *ifname, struct ifreq *ifr){
1125
int ret;
1126
error_t ret_errno;
1127
1128
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1129
if(s < 0){
1130
ret_errno = errno;
1131
perror_plus("socket");
1132
errno = ret_errno;
1133
return false;
1134
}
1135
strcpy(ifr->ifr_name, ifname);
1136
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1137
if(ret == -1){
1138
if(debug){
1139
ret_errno = errno;
1140
perror_plus("ioctl SIOCGIFFLAGS");
1141
errno = ret_errno;
1142
}
1143
return false;
1144
}
1145
return true;
1146
}
1147
1148
bool good_flags(const char *ifname, const struct ifreq *ifr){
1149
1150
/* Reject the loopback device */
1151
if(ifr->ifr_flags & IFF_LOOPBACK){
1152
if(debug){
1153
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1154
ifname);
1155
}
1156
return false;
1157
}
1158
/* Accept point-to-point devices only if connect_to is specified */
1159
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1160
if(debug){
1161
fprintf_plus(stderr, "Accepting point-to-point interface"
1162
" \"%s\"\n", ifname);
1163
}
1164
return true;
1165
}
1166
/* Otherwise, reject non-broadcast-capable devices */
1167
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1168
if(debug){
1169
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1170
" \"%s\"\n", ifname);
1171
}
1172
return false;
1173
}
1174
/* Reject non-ARP interfaces (including dummy interfaces) */
1175
if(ifr->ifr_flags & IFF_NOARP){
1176
if(debug){
1177
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1178
ifname);
1179
}
1180
return false;
1181
}
1182
1183
/* Accept this device */
1184
if(debug){
1185
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1186
}
1187
return true;
1188
}
1189
1190
/*
1191
* This function determines if a directory entry in /sys/class/net
1192
* corresponds to an acceptable network device.
1193
* (This function is passed to scandir(3) as a filter function.)
1194
*/
1195
int good_interface(const struct dirent *if_entry){
1196
if(if_entry->d_name[0] == '.'){
1197
return 0;
1198
}
1199
1200
struct ifreq ifr;
1201
if(not get_flags(if_entry->d_name, &ifr)){
1202
if(debug){
1203
fprintf_plus(stderr, "Failed to get flags for interface "
1204
"\"%s\"\n", if_entry->d_name);
1205
}
1206
return 0;
1207
}
1208
1209
if(not good_flags(if_entry->d_name, &ifr)){
1210
return 0;
1211
}
1212
return 1;
1213
}
1214
1215
/*
1216
* This function determines if a network interface is up.
1217
*/
1218
bool interface_is_up(const char *interface){
1219
struct ifreq ifr;
1220
if(not get_flags(interface, &ifr)){
1221
if(debug){
1222
fprintf_plus(stderr, "Failed to get flags for interface "
1223
"\"%s\"\n", interface);
1224
}
1225
return false;
1226
}
1227
1228
return (bool)(ifr.ifr_flags & IFF_UP);
1229
}
1230
1231
/*
1232
* This function determines if a network interface is running
1233
*/
1234
bool interface_is_running(const char *interface){
1235
struct ifreq ifr;
1236
if(not get_flags(interface, &ifr)){
1237
if(debug){
1238
fprintf_plus(stderr, "Failed to get flags for interface "
1239
"\"%s\"\n", interface);
1240
}
1241
return false;
1242
}
1243
1244
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1245
}
1246
1247
int notdotentries(const struct dirent *direntry){
1248
/* Skip "." and ".." */
1249
if(direntry->d_name[0] == '.'
1250
and (direntry->d_name[1] == '\0'
1251
or (direntry->d_name[1] == '.'
1252
and direntry->d_name[2] == '\0'))){
1253
return 0;
1254
}
1255
return 1;
1256
}
1257
1258
/* Is this directory entry a runnable program? */
1259
int runnable_hook(const struct dirent *direntry){
1260
int ret;
1261
size_t sret;
1262
struct stat st;
1263
1264
if((direntry->d_name)[0] == '\0'){
1265
/* Empty name? */
1266
return 0;
1267
}
1268
1269
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1270
"abcdefghijklmnopqrstuvwxyz"
1271
"0123456789"
1272
"_-");
1273
if((direntry->d_name)[sret] != '\0'){
1274
/* Contains non-allowed characters */
1275
if(debug){
1276
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1277
direntry->d_name);
1278
}
1279
return 0;
1280
}
1281
1282
char *fullname = NULL;
1283
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1284
if(ret < 0){
1285
perror_plus("asprintf");
1286
return 0;
1287
}
1288
1289
ret = stat(fullname, &st);
1290
if(ret == -1){
1291
if(debug){
1292
perror_plus("Could not stat hook");
1293
}
1294
return 0;
1295
}
1296
if(not (S_ISREG(st.st_mode))){
1297
/* Not a regular file */
1298
if(debug){
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1305
/* Not executable */
1306
if(debug){
1307
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1308
direntry->d_name);
1309
}
1310
return 0;
1311
}
1312
if(debug){
1313
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1314
direntry->d_name);
1315
}
1316
return 1;
1317
}
1318
1319
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1320
int ret;
1321
struct timespec now;
1322
struct timespec waited_time;
1323
intmax_t block_time;
1324
1325
while(true){
1326
if(mc.current_server == NULL){
1327
if (debug){
1328
fprintf_plus(stderr, "Wait until first server is found."
1329
" No timeout!\n");
1330
}
1331
ret = avahi_simple_poll_iterate(s, -1);
1332
} else {
1333
if (debug){
1334
fprintf_plus(stderr, "Check current_server if we should run"
1335
" it, or wait\n");
1336
}
1337
/* the current time */
1338
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1339
if(ret == -1){
1340
perror_plus("clock_gettime");
1341
return -1;
1342
}
1343
/* Calculating in ms how long time between now and server
1344
who we visted longest time ago. Now - last seen. */
1345
waited_time.tv_sec = (now.tv_sec
1346
- mc.current_server->last_seen.tv_sec);
1347
waited_time.tv_nsec = (now.tv_nsec
1348
- mc.current_server->last_seen.tv_nsec);
1349
/* total time is 10s/10,000ms.
1350
Converting to s from ms by dividing by 1,000,
1351
and ns to ms by dividing by 1,000,000. */
1352
block_time = ((retry_interval
1353
- ((intmax_t)waited_time.tv_sec * 1000))
1354
- ((intmax_t)waited_time.tv_nsec / 1000000));
1355
1356
if (debug){
1357
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1358
block_time);
1359
}
1360
1361
if(block_time <= 0){
1362
ret = start_mandos_communication(mc.current_server->ip,
1363
mc.current_server->port,
1364
mc.current_server->if_index,
1365
mc.current_server->af);
1366
if(ret == 0){
1367
avahi_simple_poll_quit(simple_poll);
1368
return 0;
1369
}
1370
ret = clock_gettime(CLOCK_MONOTONIC,
1371
&mc.current_server->last_seen);
1372
if(ret == -1){
1373
perror_plus("clock_gettime");
1374
return -1;
1375
}
1376
mc.current_server = mc.current_server->next;
1377
block_time = 0; /* Call avahi to find new Mandos
1378
servers, but don't block */
1379
}
1380
1381
ret = avahi_simple_poll_iterate(s, (int)block_time);
1382
}
1383
if(ret != 0){
1384
if (ret > 0 or errno != EINTR){
1385
return (ret != 1) ? ret : 0;
1386
}
1387
}
1388
}
1389
}
1390
1391
/* Set effective uid to 0, return errno */
1392
error_t raise_privileges(void){
1393
error_t old_errno = errno;
1394
error_t ret_errno = 0;
1395
if(seteuid(0) == -1){
1396
ret_errno = errno;
1397
perror_plus("seteuid");
1398
}
1399
errno = old_errno;
1400
return ret_errno;
1401
}
1402
1403
/* Set effective and real user ID to 0. Return errno. */
1404
error_t raise_privileges_permanently(void){
1405
error_t old_errno = errno;
1406
error_t ret_errno = raise_privileges();
1407
if(ret_errno != 0){
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
if(setuid(0) == -1){
1412
ret_errno = errno;
1413
perror_plus("seteuid");
1414
}
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
1419
/* Set effective user ID to unprivileged saved user ID */
1420
error_t lower_privileges(void){
1421
error_t old_errno = errno;
1422
error_t ret_errno = 0;
1423
if(seteuid(uid) == -1){
1424
ret_errno = errno;
1425
perror_plus("seteuid");
1426
}
1427
errno = old_errno;
1428
return ret_errno;
1429
}
1430
1431
/* Lower privileges permanently */
1432
error_t lower_privileges_permanently(void){
1433
error_t old_errno = errno;
1434
error_t ret_errno = 0;
1435
if(setuid(uid) == -1){
1436
ret_errno = errno;
1437
perror_plus("setuid");
1438
}
1439
errno = old_errno;
1440
return ret_errno;
1441
}
1442
1443
bool run_network_hooks(const char *mode, const char *interface,
1444
const float delay){
1445
struct dirent **direntries;
1446
struct dirent *direntry;
1447
int ret;
1448
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1449
alphasort);
1450
if(numhooks == -1){
1451
if(errno == ENOENT){
1452
if(debug){
1453
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1454
" found\n", hookdir);
1455
}
1456
} else {
1457
perror_plus("scandir");
1458
}
1459
} else {
1460
int devnull = open("/dev/null", O_RDONLY);
1461
for(int i = 0; i < numhooks; i++){
1462
direntry = direntries[i];
1463
char *fullname = NULL;
1464
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1465
if(ret < 0){
1466
perror_plus("asprintf");
1467
continue;
1468
}
1469
if(debug){
1470
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1471
direntry->d_name);
1472
}
1473
pid_t hook_pid = fork();
1474
if(hook_pid == 0){
1475
/* Child */
1476
/* Raise privileges */
1477
raise_privileges_permanently();
1478
/* Set group */
1479
errno = 0;
1480
ret = setgid(0);
1481
if(ret == -1){
1482
perror_plus("setgid");
1483
}
1484
/* Reset supplementary groups */
1485
errno = 0;
1486
ret = setgroups(0, NULL);
1487
if(ret == -1){
1488
perror_plus("setgroups");
1489
}
1490
dup2(devnull, STDIN_FILENO);
1491
close(devnull);
1492
dup2(STDERR_FILENO, STDOUT_FILENO);
1493
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("DEVICE", interface, 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
ret = setenv("MODE", mode, 1);
1509
if(ret == -1){
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
char *delaystring;
1514
ret = asprintf(&delaystring, "%f", delay);
1515
if(ret == -1){
1516
perror_plus("asprintf");
1517
_exit(EX_OSERR);
1518
}
1519
ret = setenv("DELAY", delaystring, 1);
1520
if(ret == -1){
1521
free(delaystring);
1522
perror_plus("setenv");
1523
_exit(EX_OSERR);
1524
}
1525
free(delaystring);
1526
if(connect_to != NULL){
1527
ret = setenv("CONNECT", connect_to, 1);
1528
if(ret == -1){
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1532
}
1533
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1534
perror_plus("execl");
1535
_exit(EXIT_FAILURE);
1536
}
1537
} else {
1538
int status;
1539
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1540
perror_plus("waitpid");
1541
free(fullname);
1542
continue;
1543
}
1544
if(WIFEXITED(status)){
1545
if(WEXITSTATUS(status) != 0){
1546
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1547
" with status %d\n", direntry->d_name,
1548
WEXITSTATUS(status));
1549
free(fullname);
1550
continue;
1551
}
1552
} else if(WIFSIGNALED(status)){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1554
" signal %d\n", direntry->d_name,
1555
WTERMSIG(status));
1556
free(fullname);
1557
continue;
1558
} else {
1559
fprintf_plus(stderr, "Warning: network hook \"%s\""
1560
" crashed\n", direntry->d_name);
1561
free(fullname);
1562
continue;
1563
}
1564
}
1565
free(fullname);
1566
if(debug){
1567
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1568
direntry->d_name);
1569
}
1570
}
1571
close(devnull);
1572
}
1573
return true;
1574
}
1575
1576
error_t bring_up_interface(const char *const interface,
1577
const float delay){
1578
int sd = -1;
1579
error_t old_errno = errno;
1580
error_t ret_errno = 0;
1581
int ret, ret_setflags;
1582
struct ifreq network;
1583
unsigned int if_index = if_nametoindex(interface);
1584
if(if_index == 0){
1585
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1586
errno = old_errno;
1587
return ENXIO;
1588
}
1589
1590
if(quit_now){
1591
errno = old_errno;
1592
return EINTR;
1593
}
1594
1595
if(not interface_is_up(interface)){
1596
if(not get_flags(interface, &network) and debug){
1597
ret_errno = errno;
1598
fprintf_plus(stderr, "Failed to get flags for interface "
1599
"\"%s\"\n", interface);
1600
return ret_errno;
1601
}
1602
network.ifr_flags |= IFF_UP;
1603
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
1606
ret_errno = errno;
1607
perror_plus("socket");
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
if(quit_now){
1613
close(sd);
1614
errno = old_errno;
1615
return EINTR;
1616
}
1617
1618
if(debug){
1619
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1620
interface);
1621
}
1622
1623
/* Raise priviliges */
1624
raise_privileges();
1625
1626
#ifdef __linux__
1627
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1628
messages about the network interface to mess up the prompt */
1629
int ret_linux = klogctl(8, NULL, 5);
1630
bool restore_loglevel = true;
1631
if(ret_linux == -1){
1632
restore_loglevel = false;
1633
perror_plus("klogctl");
1634
}
1635
#endif /* __linux__ */
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
1638
#ifdef __linux__
1639
if(restore_loglevel){
1640
ret_linux = klogctl(7, NULL, 0);
1641
if(ret_linux == -1){
1642
perror_plus("klogctl");
1643
}
1644
}
1645
#endif /* __linux__ */
1646
1647
/* Lower privileges */
1648
lower_privileges();
1649
1650
/* Close the socket */
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1652
if(ret == -1){
1653
perror_plus("close");
1654
}
1655
1656
if(ret_setflags == -1){
1657
errno = ret_errno;
1658
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1659
errno = old_errno;
1660
return ret_errno;
1661
}
1662
} else if(debug){
1663
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1664
interface);
1665
}
1666
1667
/* Sleep checking until interface is running.
1668
Check every 0.25s, up to total time of delay */
1669
for(int i=0; i < delay * 4; i++){
1670
if(interface_is_running(interface)){
1671
break;
1672
}
1673
struct timespec sleeptime = { .tv_nsec = 250000000 };
1674
ret = nanosleep(&sleeptime, NULL);
1675
if(ret == -1 and errno != EINTR){
1676
perror_plus("nanosleep");
1677
}
1678
}
1679
1680
errno = old_errno;
1681
return 0;
1682
}
1683
1684
error_t take_down_interface(const char *const interface){
1685
int sd = -1;
1686
error_t old_errno = errno;
1687
error_t ret_errno = 0;
1688
int ret, ret_setflags;
1689
struct ifreq network;
1690
unsigned int if_index = if_nametoindex(interface);
1691
if(if_index == 0){
1692
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1693
errno = old_errno;
1694
return ENXIO;
1695
}
1696
if(interface_is_up(interface)){
1697
if(not get_flags(interface, &network) and debug){
1698
ret_errno = errno;
1699
fprintf_plus(stderr, "Failed to get flags for interface "
1700
"\"%s\"\n", interface);
1701
return ret_errno;
1702
}
1703
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1704
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
1707
ret_errno = errno;
1708
perror_plus("socket");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
1713
if(debug){
1714
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1715
interface);
1716
}
1717
1718
/* Raise priviliges */
1719
raise_privileges();
1720
1721
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1722
ret_errno = errno;
1723
1724
/* Lower privileges */
1725
lower_privileges();
1726
1727
/* Close the socket */
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1729
if(ret == -1){
1730
perror_plus("close");
1731
}
1732
1733
if(ret_setflags == -1){
1734
errno = ret_errno;
1735
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1736
errno = old_errno;
1737
return ret_errno;
1738
}
1739
} else if(debug){
1740
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1741
interface);
1742
}
1743
1744
errno = old_errno;
1745
return 0;
968
if(mc.simple_poll != NULL){
969
avahi_simple_poll_quit(mc.simple_poll);
970
}
971
errno = old_errno;
1746
972
}
1747
973
1748
974
int main(int argc, char *argv[]){
1749
975
AvahiSServiceBrowser *sb = NULL;
1750
error_t ret_errno;
976
int error;
1751
977
int ret;
1752
978
intmax_t tmpmax;
1753
979
char *tmp;
1754
980
int exitcode = EXIT_SUCCESS;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
1757
char *interfaces_to_take_down = NULL;
1758
size_t interfaces_to_take_down_size = 0;
981
const char *interface = "eth0";
982
struct ifreq network;
983
int sd = -1;
984
bool take_down_interface = false;
985
uid_t uid;
986
gid_t gid;
987
char *connect_to = NULL;
1759
988
char tempdir[] = "/tmp/mandosXXXXXX";
1760
989
bool tempdir_created = false;
1761
990
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1762
991
const char *seckey = PATHDIR "/" SECKEY;
1763
992
const char *pubkey = PATHDIR "/" PUBKEY;
1764
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1766
993
1767
994
bool gnutls_initialized = false;
1768
995
bool gpgme_initialized = false;
1769
996
float delay = 2.5f;
1770
double retry_interval = 10; /* 10s between trying a server and
1771
retrying the same server again */
1772
997
1773
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
998
struct sigaction old_sigterm_action;
1774
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1775
1000
1776
uid = getuid();
1777
gid = getgid();
1778
1779
/* Lower any group privileges we might have, just to be safe */
1780
errno = 0;
1781
ret = setgid(gid);
1782
if(ret == -1){
1783
perror_plus("setgid");
1784
}
1785
1786
/* Lower user privileges (temporarily) */
1787
errno = 0;
1788
ret = seteuid(uid);
1789
if(ret == -1){
1790
perror_plus("seteuid");
1791
}
1792
1793
if(quit_now){
1794
goto end;
1795
}
1796
1797
1001
{
1798
1002
struct argp_option options[] = {
1799
1003
{ .name = "debug", .key = 128,
1828
1032
.arg = "SECONDS",
1829
1033
.doc = "Maximum delay to wait for interface startup",
1830
1034
.group = 2 },
1831
{ .name = "retry", .key = 132,
1832
.arg = "SECONDS",
1833
.doc = "Retry interval used when denied by the Mandos server",
1834
.group = 2 },
1835
{ .name = "network-hook-dir", .key = 133,
1836
.arg = "DIR",
1837
.doc = "Directory where network hooks are located",
1838
.group = 2 },
1839
/*
1840
* These reproduce what we would get without ARGP_NO_HELP
1841
*/
1842
{ .name = "help", .key = '?',
1843
.doc = "Give this help list", .group = -1 },
1844
{ .name = "usage", .key = -3,
1845
.doc = "Give a short usage message", .group = -1 },
1846
{ .name = "version", .key = 'V',
1847
.doc = "Print program version", .group = -1 },
1848
1035
{ .name = NULL }
1849
1036
};
1850
1037
1851
1038
error_t parse_opt(int key, char *arg,
1852
1039
struct argp_state *state){
1853
errno = 0;
1854
1040
switch(key){
1855
1041
case 128: /* --debug */
1856
1042
debug = true;
1859
1045
connect_to = arg;
1860
1046
break;
1861
1047
case 'i': /* --interface */
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
1864
if(ret_errno != 0){
1865
argp_error(state, "%s", strerror(ret_errno));
1866
}
1048
interface = arg;
1867
1049
break;
1868
1050
case 's': /* --seckey */
1869
1051
seckey = arg;
1876
1058
tmpmax = strtoimax(arg, &tmp, 10);
1877
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
1878
1060
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1879
argp_error(state, "Bad number of DH bits");
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
1880
1063
}
1881
1064
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1882
1065
break;
1887
1070
errno = 0;
1888
1071
delay = strtof(arg, &tmp);
1889
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
1890
argp_error(state, "Bad delay");
1891
}
1892
case 132: /* --retry */
1893
errno = 0;
1894
retry_interval = strtod(arg, &tmp);
1895
if(errno != 0 or tmp == arg or *tmp != '\0'
1896
or (retry_interval * 1000) > INT_MAX
1897
or retry_interval < 0){
1898
argp_error(state, "Bad retry interval");
1899
}
1900
break;
1901
case 133: /* --network-hook-dir */
1902
hookdir = arg;
1903
break;
1904
/*
1905
* These reproduce what we would get without ARGP_NO_HELP
1906
*/
1907
case '?': /* --help */
1908
argp_state_help(state, state->out_stream,
1909
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1910
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1911
case -3: /* --usage */
1912
argp_state_help(state, state->out_stream,
1913
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1914
case 'V': /* --version */
1915
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1916
exit(argp_err_exit_status);
1073
fprintf(stderr, "Bad delay\n");
1074
exit(EXIT_FAILURE);
1075
}
1076
break;
1077
case ARGP_KEY_ARG:
1078
argp_usage(state);
1079
case ARGP_KEY_END:
1917
1080
break;
1918
1081
default:
1919
1082
return ARGP_ERR_UNKNOWN;
1920
1083
}
1921
return errno;
1084
return 0;
1922
1085
}
1923
1086
1924
1087
struct argp argp = { .options = options, .parser = parse_opt,
1925
1088
.args_doc = "",
1926
1089
.doc = "Mandos client -- Get and decrypt"
1927
1090
" passwords from a Mandos server" };
1928
ret = argp_parse(&argp, argc, argv,
1929
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1930
switch(ret){
1931
case 0:
1932
break;
1933
case ENOMEM:
1934
default:
1935
errno = ret;
1936
perror_plus("argp_parse");
1937
exitcode = EX_OSERR;
1938
goto end;
1939
case EINVAL:
1940
exitcode = EX_USAGE;
1941
goto end;
1942
}
1943
}
1944
1945
{
1946
/* Work around Debian bug #633582:
1947
<http://bugs.debian.org/633582> */
1948
1949
/* Re-raise priviliges */
1950
if(raise_privileges() == 0){
1951
struct stat st;
1952
1953
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1954
int seckey_fd = open(seckey, O_RDONLY);
1955
if(seckey_fd == -1){
1956
perror_plus("open");
1957
} else {
1958
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1959
if(ret == -1){
1960
perror_plus("fstat");
1961
} else {
1962
if(S_ISREG(st.st_mode)
1963
and st.st_uid == 0 and st.st_gid == 0){
1964
ret = fchown(seckey_fd, uid, gid);
1965
if(ret == -1){
1966
perror_plus("fchown");
1967
}
1968
}
1969
}
1970
TEMP_FAILURE_RETRY(close(seckey_fd));
1971
}
1972
}
1973
1974
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1975
int pubkey_fd = open(pubkey, O_RDONLY);
1976
if(pubkey_fd == -1){
1977
perror_plus("open");
1978
} else {
1979
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1980
if(ret == -1){
1981
perror_plus("fstat");
1982
} else {
1983
if(S_ISREG(st.st_mode)
1984
and st.st_uid == 0 and st.st_gid == 0){
1985
ret = fchown(pubkey_fd, uid, gid);
1986
if(ret == -1){
1987
perror_plus("fchown");
1988
}
1989
}
1990
}
1991
TEMP_FAILURE_RETRY(close(pubkey_fd));
1992
}
1993
}
1994
1995
/* Lower privileges */
1996
errno = 0;
1997
ret = seteuid(uid);
1998
if(ret == -1){
1999
perror_plus("seteuid");
2000
}
2001
}
2002
}
2003
2004
/* Remove empty interface names */
2005
{
2006
char *interface = NULL;
2007
while((interface = argz_next(interfaces, interfaces_size,
2008
interface))){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2011
fprintf_plus(stderr, "Not using nonexisting interface"
2012
" \"%s\"\n", interface);
2013
}
2014
argz_delete(&interfaces, &interfaces_size, interface);
2015
interface = NULL;
2016
}
2017
}
2018
}
2019
2020
/* Run network hooks */
2021
{
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2025
if(interfaces_hooks == NULL){
2026
perror_plus("malloc");
2027
goto end;
2028
}
2029
memcpy(interfaces_hooks, interfaces, interfaces_size);
2030
interfaces_hooks_size = interfaces_size;
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2032
(int)',');
2033
}
2034
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2035
interfaces_hooks : "", delay)){
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
2036
1095
goto end;
2037
1096
}
2038
1097
}
2045
1104
from the signal handler */
2046
1105
/* Initialize the pseudo-RNG for Avahi */
2047
1106
srand((unsigned int) time(NULL));
2048
simple_poll = avahi_simple_poll_new();
2049
if(simple_poll == NULL){
2050
fprintf_plus(stderr,
2051
"Avahi: Failed to create simple poll object.\n");
2052
exitcode = EX_UNAVAILABLE;
1107
mc.simple_poll = avahi_simple_poll_new();
1108
if(mc.simple_poll == NULL){
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
2053
1111
goto end;
2054
1112
}
2055
1113
2056
1114
sigemptyset(&sigterm_action.sa_mask);
2057
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2058
1116
if(ret == -1){
2059
perror_plus("sigaddset");
2060
exitcode = EX_OSERR;
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
2061
1119
goto end;
2062
1120
}
2063
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2064
1122
if(ret == -1){
2065
perror_plus("sigaddset");
2066
exitcode = EX_OSERR;
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
2067
1125
goto end;
2068
1126
}
2069
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2070
1128
if(ret == -1){
2071
perror_plus("sigaddset");
2072
exitcode = EX_OSERR;
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
2073
1131
goto end;
2074
1132
}
2075
1133
/* Need to check if the handler is SIG_IGN before handling:
2078
1136
*/
2079
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2080
1138
if(ret == -1){
2081
perror_plus("sigaction");
2082
return EX_OSERR;
1139
perror("sigaction");
1140
return EXIT_FAILURE;
2083
1141
}
2084
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
2085
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
2086
1144
if(ret == -1){
2087
perror_plus("sigaction");
2088
exitcode = EX_OSERR;
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
2089
1147
goto end;
2090
1148
}
2091
1149
}
2092
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2093
1151
if(ret == -1){
2094
perror_plus("sigaction");
2095
return EX_OSERR;
1152
perror("sigaction");
1153
return EXIT_FAILURE;
2096
1154
}
2097
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
2098
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2099
1157
if(ret == -1){
2100
perror_plus("sigaction");
2101
exitcode = EX_OSERR;
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
2102
1160
goto end;
2103
1161
}
2104
1162
}
2105
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2106
1164
if(ret == -1){
2107
perror_plus("sigaction");
2108
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2109
1167
}
2110
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
2111
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2112
1170
if(ret == -1){
2113
perror_plus("sigaction");
2114
exitcode = EX_OSERR;
2115
goto end;
2116
}
2117
}
2118
2119
/* If no interfaces were specified, make a list */
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2122
/* Look for any good interfaces */
2123
ret = scandir(sys_class_net, &direntries, good_interface,
2124
alphasort);
2125
if(ret >= 1){
2126
/* Add all found interfaces to interfaces list */
2127
for(int i = 0; i < ret; ++i){
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2129
direntries[i]->d_name);
2130
if(ret_errno != 0){
2131
perror_plus("argz_add");
2132
continue;
2133
}
2134
if(debug){
2135
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2136
direntries[i]->d_name);
2137
}
2138
}
2139
free(direntries);
2140
} else {
2141
free(direntries);
2142
fprintf_plus(stderr, "Could not find a network interface\n");
2143
exitcode = EXIT_FAILURE;
2144
goto end;
2145
}
2146
}
2147
2148
/* If we only got one interface, explicitly use only that one */
2149
if(argz_count(interfaces, interfaces_size) == 1){
2150
if(debug){
2151
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2152
interfaces);
2153
}
2154
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2155
}
2156
2157
/* Bring up interfaces which are down */
2158
if(not (argz_count(interfaces, interfaces_size) == 1
2159
and strcmp(interfaces, "none") == 0)){
2160
char *interface = NULL;
2161
while((interface = argz_next(interfaces, interfaces_size,
2162
interface))){
2163
bool interface_was_up = interface_is_up(interface);
2164
ret = bring_up_interface(interface, delay);
2165
if(not interface_was_up){
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2169
} else {
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
2173
}
2174
}
2175
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2179
if(debug and (interfaces_to_take_down == NULL)){
2180
fprintf_plus(stderr, "No interfaces were brought up\n");
2181
}
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
1177
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
1180
if(if_index == 0){
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
1186
if(quit_now){
1187
goto end;
1188
}
1189
1190
#ifdef __linux__
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1193
ret = klogctl(8, NULL, 5);
1194
bool restore_loglevel = true;
1195
if(ret == -1){
1196
restore_loglevel = false;
1197
perror("klogctl");
1198
}
1199
#endif /* __linux__ */
1200
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
if(sd < 0){
1203
perror("socket");
1204
exitcode = EXIT_FAILURE;
1205
#ifdef __linux__
1206
if(restore_loglevel){
1207
ret = klogctl(7, NULL, 0);
1208
if(ret == -1){
1209
perror("klogctl");
1210
}
1211
}
1212
#endif /* __linux__ */
1213
goto end;
1214
}
1215
strcpy(network.ifr_name, interface);
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1217
if(ret == -1){
1218
perror("ioctl SIOCGIFFLAGS");
1219
#ifdef __linux__
1220
if(restore_loglevel){
1221
ret = klogctl(7, NULL, 0);
1222
if(ret == -1){
1223
perror("klogctl");
1224
}
1225
}
1226
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1228
goto end;
1229
}
1230
if((network.ifr_flags & IFF_UP) == 0){
1231
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
if(ret == -1){
1235
take_down_interface = false;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
goto end;
1247
}
1248
}
1249
/* sleep checking until interface is running */
1250
for(int i=0; i < delay * 4; i++){
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1252
if(ret == -1){
1253
perror("ioctl SIOCGIFFLAGS");
1254
} else if(network.ifr_flags & IFF_RUNNING){
1255
break;
1256
}
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
ret = nanosleep(&sleeptime, NULL);
1259
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1261
}
1262
}
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
if(ret == -1){
1267
perror("close");
1268
}
1269
}
1270
#ifdef __linux__
1271
if(restore_loglevel){
1272
/* Restores kernel loglevel to default */
1273
ret = klogctl(7, NULL, 0);
1274
if(ret == -1){
1275
perror("klogctl");
1276
}
1277
}
1278
#endif /* __linux__ */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1283
}
1284
1285
uid = getuid();
1286
gid = getgid();
1287
1288
errno = 0;
1289
setgid(gid);
1290
if(ret == -1){
1291
perror("setgid");
1292
}
1293
1294
ret = setuid(uid);
1295
if(ret == -1){
1296
perror("setuid");
2182
1297
}
2183
1298
2184
1299
if(quit_now){
2187
1302
2188
1303
ret = init_gnutls_global(pubkey, seckey);
2189
1304
if(ret == -1){
2190
fprintf_plus(stderr, "init_gnutls_global failed\n");
2191
exitcode = EX_UNAVAILABLE;
1305
fprintf(stderr, "init_gnutls_global failed\n");
1306
exitcode = EXIT_FAILURE;
2192
1307
goto end;
2193
1308
} else {
2194
1309
gnutls_initialized = true;
2198
1313
goto end;
2199
1314
}
2200
1315
1316
tempdir_created = true;
2201
1317
if(mkdtemp(tempdir) == NULL){
2202
perror_plus("mkdtemp");
1318
tempdir_created = false;
1319
perror("mkdtemp");
2203
1320
goto end;
2204
1321
}
2205
tempdir_created = true;
2206
1322
2207
1323
if(quit_now){
2208
1324
goto end;
2209
1325
}
2210
1326
2211
1327
if(not init_gpgme(pubkey, seckey, tempdir)){
2212
fprintf_plus(stderr, "init_gpgme failed\n");
2213
exitcode = EX_UNAVAILABLE;
1328
fprintf(stderr, "init_gpgme failed\n");
1329
exitcode = EXIT_FAILURE;
2214
1330
goto end;
2215
1331
} else {
2216
1332
gpgme_initialized = true;
2224
1340
/* Connect directly, do not use Zeroconf */
2225
1341
/* (Mainly meant for debugging) */
2226
1342
char *address = strrchr(connect_to, ':');
2227
2228
1343
if(address == NULL){
2229
fprintf_plus(stderr, "No colon in address\n");
2230
exitcode = EX_USAGE;
1344
fprintf(stderr, "No colon in address\n");
1345
exitcode = EXIT_FAILURE;
2231
1346
goto end;
2232
1347
}
2233
1348
2235
1350
goto end;
2236
1351
}
2237
1352
2238
in_port_t port;
1353
uint16_t port;
2239
1354
errno = 0;
2240
1355
tmpmax = strtoimax(address+1, &tmp, 10);
2241
1356
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2242
or tmpmax != (in_port_t)tmpmax){
2243
fprintf_plus(stderr, "Bad port number\n");
2244
exitcode = EX_USAGE;
1357
or tmpmax != (uint16_t)tmpmax){
1358
fprintf(stderr, "Bad port number\n");
1359
exitcode = EXIT_FAILURE;
2245
1360
goto end;
2246
1361
}
2247
1362
2249
1364
goto end;
2250
1365
}
2251
1366
2252
port = (in_port_t)tmpmax;
1367
port = (uint16_t)tmpmax;
2253
1368
*address = '\0';
1369
address = connect_to;
2254
1370
/* Colon in address indicates IPv6 */
2255
1371
int af;
2256
if(strchr(connect_to, ':') != NULL){
1372
if(strchr(address, ':') != NULL){
2257
1373
af = AF_INET6;
2258
/* Accept [] around IPv6 address - see RFC 5952 */
2259
if(connect_to[0] == '[' and address[-1] == ']')
2260
{
2261
connect_to++;
2262
address[-1] = '\0';
2263
}
2264
1374
} else {
2265
1375
af = AF_INET;
2266
1376
}
2267
address = connect_to;
2268
1377
2269
1378
if(quit_now){
2270
1379
goto end;
2271
1380
}
2272
1381
2273
while(not quit_now){
2274
ret = start_mandos_communication(address, port, if_index, af);
2275
if(quit_now or ret == 0){
2276
break;
2277
}
2278
if(debug){
2279
fprintf_plus(stderr, "Retrying in %d seconds\n",
2280
(int)retry_interval);
2281
}
2282
sleep((int)retry_interval);
2283
}
2284
2285
if (not quit_now){
1382
ret = start_mandos_communication(address, port, if_index, af);
1383
if(ret < 0){
1384
exitcode = EXIT_FAILURE;
1385
} else {
2286
1386
exitcode = EXIT_SUCCESS;
2287
1387
}
2288
2289
1388
goto end;
2290
1389
}
2291
1390
2303
1402
config.publish_domain = 0;
2304
1403
2305
1404
/* Allocate a new server */
2306
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2307
&config, NULL, NULL, &ret_errno);
1405
mc.server = avahi_server_new(avahi_simple_poll_get
1406
(mc.simple_poll), &config, NULL,
1407
NULL, &error);
2308
1408
2309
1409
/* Free the Avahi configuration data */
2310
1410
avahi_server_config_free(&config);
2312
1412
2313
1413
/* Check if creating the Avahi server object succeeded */
2314
1414
if(mc.server == NULL){
2315
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2316
avahi_strerror(ret_errno));
2317
exitcode = EX_UNAVAILABLE;
1415
fprintf(stderr, "Failed to create Avahi server: %s\n",
1416
avahi_strerror(error));
1417
exitcode = EXIT_FAILURE;
2318
1418
goto end;
2319
1419
}
2320
1420
2327
1427
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2328
1428
NULL, 0, browse_callback, NULL);
2329
1429
if(sb == NULL){
2330
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2331
avahi_strerror(avahi_server_errno(mc.server)));
2332
exitcode = EX_UNAVAILABLE;
1430
fprintf(stderr, "Failed to create service browser: %s\n",
1431
avahi_strerror(avahi_server_errno(mc.server)));
1432
exitcode = EXIT_FAILURE;
2333
1433
goto end;
2334
1434
}
2335
1435
2340
1440
/* Run the main loop */
2341
1441
2342
1442
if(debug){
2343
fprintf_plus(stderr, "Starting Avahi loop search\n");
2344
}
2345
2346
ret = avahi_loop_with_timeout(simple_poll,
2347
(int)(retry_interval * 1000));
2348
if(debug){
2349
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2350
(ret == 0) ? "successfully" : "with error");
2351
}
1443
fprintf(stderr, "Starting Avahi loop search\n");
1444
}
1445
1446
avahi_simple_poll_loop(mc.simple_poll);
2352
1447
2353
1448
end:
2354
1449
2355
1450
if(debug){
2356
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1451
fprintf(stderr, "%s exiting\n", argv[0]);
2357
1452
}
2358
1453
2359
1454
/* Cleanup things */
2363
1458
if(mc.server != NULL)
2364
1459
avahi_server_free(mc.server);
2365
1460
2366
if(simple_poll != NULL)
2367
avahi_simple_poll_free(simple_poll);
1461
if(mc.simple_poll != NULL)
1462
avahi_simple_poll_free(mc.simple_poll);
2368
1463
2369
1464
if(gnutls_initialized){
2370
1465
gnutls_certificate_free_credentials(mc.cred);
2376
1471
gpgme_release(mc.ctx);
2377
1472
}
2378
1473
2379
/* Cleans up the circular linked list of Mandos servers the client
2380
has seen */
2381
if(mc.current_server != NULL){
2382
mc.current_server->prev->next = NULL;
2383
while(mc.current_server != NULL){
2384
server *next = mc.current_server->next;
2385
free(mc.current_server);
2386
mc.current_server = next;
2387
}
2388
}
2389
2390
/* Re-raise priviliges */
2391
{
2392
raise_privileges();
2393
2394
/* Run network hooks */
2395
run_network_hooks("stop", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2397
2398
/* Take down the network interfaces which were brought up */
2399
{
2400
char *interface = NULL;
2401
while((interface=argz_next(interfaces_to_take_down,
2402
interfaces_to_take_down_size,
2403
interface))){
2404
ret_errno = take_down_interface(interface);
2405
if(ret_errno != 0){
2406
errno = ret_errno;
2407
perror_plus("Failed to take down interface");
2408
}
2409
}
2410
if(debug and (interfaces_to_take_down == NULL)){
2411
fprintf_plus(stderr, "No interfaces needed to be taken"
2412
" down\n");
2413
}
2414
}
2415
2416
lower_privileges_permanently();
2417
}
2418
2419
free(interfaces_to_take_down);
2420
free(interfaces_hooks);
2421
2422
/* Removes the GPGME temp directory and all files inside */
1474
/* Take down the network interface */
1475
if(take_down_interface){
1476
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1477
if(ret == -1){
1478
perror("ioctl SIOCGIFFLAGS");
1479
} else if(network.ifr_flags & IFF_UP) {
1480
network.ifr_flags &= ~IFF_UP; /* clear flag */
1481
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1482
if(ret == -1){
1483
perror("ioctl SIOCSIFFLAGS");
1484
}
1485
}
1486
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1487
if(ret == -1){
1488
perror("close");
1489
}
1490
}
1491
1492
/* Removes the temp directory used by GPGME */
2423
1493
if(tempdir_created){
2424
struct dirent **direntries = NULL;
2425
struct dirent *direntry = NULL;
2426
int numentries = scandir(tempdir, &direntries, notdotentries,
2427
alphasort);
2428
if (numentries > 0){
2429
for(int i = 0; i < numentries; i++){
2430
direntry = direntries[i];
1494
DIR *d;
1495
struct dirent *direntry;
1496
d = opendir(tempdir);
1497
if(d == NULL){
1498
if(errno != ENOENT){
1499
perror("opendir");
1500
}
1501
} else {
1502
while(true){
1503
direntry = readdir(d);
1504
if(direntry == NULL){
1505
break;
1506
}
1507
/* Skip "." and ".." */
1508
if(direntry->d_name[0] == '.'
1509
and (direntry->d_name[1] == '\0'
1510
or (direntry->d_name[1] == '.'
1511
and direntry->d_name[2] == '\0'))){
1512
continue;
1513
}
2431
1514
char *fullname = NULL;
2432
1515
ret = asprintf(&fullname, "%s/%s", tempdir,
2433
1516
direntry->d_name);
2434
1517
if(ret < 0){
2435
perror_plus("asprintf");
1518
perror("asprintf");
2436
1519
continue;
2437
1520
}
2438
1521
ret = remove(fullname);
2439
1522
if(ret == -1){
2440
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2441
strerror(errno));
1523
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1524
strerror(errno));
2442
1525
}
2443
1526
free(fullname);
2444
1527
}
2445
}
2446
2447
/* need to clean even if 0 because man page doesn't specify */
2448
free(direntries);
2449
if (numentries == -1){
2450
perror_plus("scandir");
1528
closedir(d);
2451
1529
}
2452
1530
ret = rmdir(tempdir);
2453
1531
if(ret == -1 and errno != ENOENT){
2454
perror_plus("rmdir");
1532
perror("rmdir");
2455
1533
}
2456
1534
}
2457
1535
2458
1536
if(quit_now){
2459
1537
sigemptyset(&old_sigterm_action.sa_mask);
2460
1538
old_sigterm_action.sa_handler = SIG_DFL;
2461
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2462
&old_sigterm_action,
2463
NULL));
1539
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2464
1540
if(ret == -1){
2465
perror_plus("sigaction");
2466
}
2467
do {
2468
ret = raise(signal_received);
2469
} while(ret != 0 and errno == EINTR);
2470
if(ret != 0){
2471
perror_plus("raise");
2472
abort();
2473
}
2474
TEMP_FAILURE_RETRY(pause());
1541
perror("sigaction");
1542
}
1543
raise(signal_received);
2475
1544
}
2476
1545
2477
1546
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0