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- Committer: Teddy Hogeborn
- Date: 2012-06-17 02:30:59 UTC
- Revision ID: teddy@recompile.se-20120617023059-em4nfnxg1tsn64xj
* plugins.d/mandos-client (start_mandos_communication): Bug fix; skip
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
- files added:
- debian/mandos-client.examples
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.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 */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
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() */
56
#include <sys/stat.h> /* open(), S_ISREG */
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 <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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,
84
84
raise() */
85
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
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() */
87
94
88
95
#ifdef __linux__
89
96
#include <sys/klog.h> /* klogctl() */
107
114
init_gnutls_session(),
108
115
GNUTLS_* */
109
116
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
112
119
113
120
/* GPGME */
114
121
#include <gpgme.h> /* All GPGME types, constants and
122
129
#define PATHDIR "/conf/conf.d/mandos"
123
130
#define SECKEY "seckey.txt"
124
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
133
126
134
bool debug = false;
127
135
static const char mandos_protocol_version[] = "1";
128
136
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
138
static const char sys_class_net[] = "/sys/class/net";
131
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;
132
154
133
155
/* Used for passing in values through the Avahi callback functions */
134
156
typedef struct {
135
AvahiSimplePoll *simple_poll;
136
157
AvahiServer *server;
137
158
gnutls_certificate_credentials_t cred;
138
159
unsigned int dh_bits;
139
160
gnutls_dh_params_t dh_params;
140
161
const char *priority;
141
162
gpgme_ctx_t ctx;
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
142
166
} mandos_context;
143
167
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
148
170
149
171
sig_atomic_t quit_now = 0;
150
172
int signal_received = 0;
151
173
174
/* Function to use when printing errors */
175
void perror_plus(const char *print_text){
176
int e = errno;
177
fprintf(stderr, "Mandos plugin %s: ",
178
program_invocation_short_name);
179
errno = e;
180
perror(print_text);
181
}
182
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_list ap;
186
va_start (ap, format);
187
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
152
193
/*
153
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
195
* bytes. "buffer_capacity" is how much is currently allocated,
155
196
* "buffer_length" is how much is already used.
156
197
*/
157
198
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
199
size_t buffer_capacity){
159
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
202
if(buffer == NULL){
166
207
return buffer_capacity;
167
208
}
168
209
210
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
213
int ret;
214
server *new_server = malloc(sizeof(server));
215
if(new_server == NULL){
216
perror_plus("malloc");
217
return false;
218
}
219
*new_server = (server){ .ip = strdup(ip),
220
.port = port,
221
.if_index = if_index,
222
.af = af };
223
if(new_server->ip == NULL){
224
perror_plus("strdup");
225
return false;
226
}
227
/* Special case of first server */
228
if(*current_server == NULL){
229
new_server->next = new_server;
230
new_server->prev = new_server;
231
*current_server = new_server;
232
/* Place the new server last in the list */
233
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
236
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
return true;
245
}
246
169
247
/*
170
248
* Initialize GPGME.
171
249
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
174
252
gpgme_error_t rc;
175
253
gpgme_engine_info_t engine_info;
176
254
177
178
255
/*
179
256
* Helper function to insert pub and seckey to the engine keyring.
180
257
*/
185
262
186
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
264
if(fd == -1){
188
perror("open");
265
perror_plus("open");
189
266
return false;
190
267
}
191
268
192
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
270
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
196
273
return false;
197
274
}
198
275
199
rc = gpgme_op_import(mc.ctx, pgp_data);
276
rc = gpgme_op_import(mc->ctx, pgp_data);
200
277
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
203
280
return false;
204
281
}
205
282
206
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
284
if(ret == -1){
208
perror("close");
285
perror_plus("close");
209
286
}
210
287
gpgme_data_release(pgp_data);
211
288
return true;
212
289
}
213
290
214
291
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
292
fprintf_plus(stderr, "Initializing GPGME\n");
216
293
}
217
294
218
295
/* Init GPGME */
219
296
gpgme_check_version(NULL);
220
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
298
if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
224
301
return false;
225
302
}
226
303
227
/* Set GPGME home directory for the OpenPGP engine only */
304
/* Set GPGME home directory for the OpenPGP engine only */
228
305
rc = gpgme_get_engine_info(&engine_info);
229
306
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
232
309
return false;
233
310
}
234
311
while(engine_info != NULL){
240
317
engine_info = engine_info->next;
241
318
}
242
319
if(engine_info == NULL){
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
244
322
return false;
245
323
}
246
324
247
325
/* Create new GPGME "context" */
248
rc = gpgme_new(&(mc.ctx));
326
rc = gpgme_new(&(mc->ctx));
249
327
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
252
331
return false;
253
332
}
254
333
265
344
*/
266
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
346
size_t crypto_size,
268
char **plaintext){
347
char **plaintext,
348
mandos_context *mc){
269
349
gpgme_data_t dh_crypto, dh_plain;
270
350
gpgme_error_t rc;
271
351
ssize_t ret;
273
353
ssize_t plaintext_length = 0;
274
354
275
355
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
277
357
}
278
358
279
359
/* Create new GPGME data buffer from memory cryptotext */
280
360
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
361
0);
282
362
if(rc != GPG_ERR_NO_ERROR){
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
285
365
return -1;
286
366
}
287
367
288
368
/* Create new empty GPGME data buffer for the plaintext */
289
369
rc = gpgme_data_new(&dh_plain);
290
370
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
293
374
gpgme_data_release(dh_crypto);
294
375
return -1;
295
376
}
296
377
297
378
/* Decrypt data from the cryptotext data buffer to the plaintext
298
379
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
300
381
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
303
384
plaintext_length = -1;
304
385
if(debug){
305
386
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
387
result = gpgme_op_decrypt_result(mc->ctx);
307
388
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
309
390
} else {
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
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);
314
395
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
316
397
}
317
398
gpgme_recipient_t recipient;
318
399
recipient = result->recipients;
319
400
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
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");
326
408
recipient = recipient->next;
327
409
}
328
410
}
331
413
}
332
414
333
415
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
335
417
}
336
418
337
419
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
420
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
421
perror_plus("gpgme_data_seek");
340
422
plaintext_length = -1;
341
423
goto decrypt_end;
342
424
}
344
426
*plaintext = NULL;
345
427
while(true){
346
428
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
429
(size_t)plaintext_length,
430
plaintext_capacity);
349
431
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
353
435
}
354
436
355
437
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
360
442
break;
361
443
}
362
444
if(ret < 0){
363
perror("gpgme_data_read");
445
perror_plus("gpgme_data_read");
364
446
plaintext_length = -1;
365
447
goto decrypt_end;
366
448
}
368
450
}
369
451
370
452
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
453
fprintf_plus(stderr, "Decrypted password is: ");
372
454
for(ssize_t i = 0; i < plaintext_length; i++){
373
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
456
}
386
468
}
387
469
388
470
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
391
472
if(ret == NULL)
392
473
ret = "(unknown)";
393
474
return ret;
396
477
/* GnuTLS log function callback */
397
478
static void debuggnutls(__attribute__((unused)) int level,
398
479
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
400
481
}
401
482
402
483
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
484
const char *seckeyfilename,
485
mandos_context *mc){
404
486
int ret;
405
487
406
488
if(debug){
407
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
408
490
}
409
491
410
492
ret = gnutls_global_init();
411
493
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
414
496
return -1;
415
497
}
416
498
423
505
}
424
506
425
507
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
427
509
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
433
512
gnutls_global_deinit();
434
513
return -1;
435
514
}
436
515
437
516
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
441
521
}
442
522
443
523
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
524
(mc->cred, pubkeyfilename, seckeyfilename,
445
525
GNUTLS_OPENPGP_FMT_BASE64);
446
526
if(ret != GNUTLS_E_SUCCESS){
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
527
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
safer_gnutls_strerror(ret));
452
532
goto globalfail;
453
533
}
454
534
455
535
/* GnuTLS server initialization */
456
ret = gnutls_dh_params_init(&mc.dh_params);
536
ret = gnutls_dh_params_init(&mc->dh_params);
457
537
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
460
541
goto globalfail;
461
542
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
463
544
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
466
547
goto globalfail;
467
548
}
468
549
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
470
551
471
552
return 0;
472
553
473
554
globalfail:
474
555
475
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_certificate_free_credentials(mc->cred);
476
557
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
558
gnutls_dh_params_deinit(mc->dh_params);
478
559
return -1;
479
560
}
480
561
481
static int init_gnutls_session(gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
482
564
int ret;
483
565
/* GnuTLS session creation */
484
566
do {
488
570
}
489
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
572
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
493
576
}
494
577
495
578
{
496
579
const char *err;
497
580
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
499
582
if(quit_now){
500
583
gnutls_deinit(*session);
501
584
return -1;
502
585
}
503
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
587
if(ret != GNUTLS_E_SUCCESS){
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
508
591
gnutls_deinit(*session);
509
592
return -1;
510
593
}
512
595
513
596
do {
514
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
598
mc->cred);
516
599
if(quit_now){
517
600
gnutls_deinit(*session);
518
601
return -1;
519
602
}
520
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
604
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
524
607
gnutls_deinit(*session);
525
608
return -1;
526
609
}
528
611
/* ignore client certificate if any. */
529
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
530
613
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
532
615
533
616
return 0;
534
617
}
538
621
__attribute__((unused)) const char *txt){}
539
622
540
623
/* Called when a Mandos server is found */
541
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
542
625
AvahiIfIndex if_index,
543
int af){
626
int af, mandos_context *mc){
544
627
int ret, tcp_sd = -1;
545
628
ssize_t sret;
546
629
union {
571
654
pf = PF_INET;
572
655
break;
573
656
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
575
658
errno = EINVAL;
576
659
return -1;
577
660
}
578
661
579
ret = init_gnutls_session(&session);
662
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
663
/* Check if the interface is one of the interfaces we are using */
664
bool match = false;
665
{
666
char *interface = NULL;
667
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
668
interface))){
669
if(if_nametoindex(interface) == (unsigned int)if_index){
670
match = true;
671
break;
672
}
673
}
674
}
675
if(not match){
676
if(debug){
677
char interface[IF_NAMESIZE];
678
if(if_indextoname((unsigned int)if_index, interface) == NULL){
679
perror_plus("if_indextoname");
680
} else {
681
fprintf_plus(stderr, "Skipping server on non-used interface"
682
" \"%s\"\n",
683
if_indextoname((unsigned int)if_index,
684
interface));
685
}
686
}
687
return -1;
688
}
689
}
690
691
ret = init_gnutls_session(&session, mc);
580
692
if(ret != 0){
581
693
return -1;
582
694
}
583
695
584
696
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
697
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
698
PRIuMAX "\n", ip, (uintmax_t)port);
587
699
}
588
700
589
701
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
702
if(tcp_sd < 0){
591
703
int e = errno;
592
perror("socket");
704
perror_plus("socket");
593
705
errno = e;
594
706
goto mandos_end;
595
707
}
609
721
}
610
722
if(ret < 0 ){
611
723
int e = errno;
612
perror("inet_pton");
724
perror_plus("inet_pton");
613
725
errno = e;
614
726
goto mandos_end;
615
727
}
616
728
if(ret == 0){
617
729
int e = errno;
618
fprintf(stderr, "Bad address: %s\n", ip);
730
fprintf_plus(stderr, "Bad address: %s\n", ip);
619
731
errno = e;
620
732
goto mandos_end;
621
733
}
622
734
if(af == AF_INET6){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
735
to.in6.sin6_port = htons(port);
627
736
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
737
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
738
-Wunreachable-code*/
630
739
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
740
fprintf_plus(stderr, "An IPv6 link-local address is"
741
" incomplete without a network interface\n");
633
742
errno = EINVAL;
634
743
goto mandos_end;
635
744
}
651
760
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
761
char interface[IF_NAMESIZE];
653
762
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
763
perror_plus("if_indextoname");
655
764
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
765
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
766
"\n", ip, interface, (uintmax_t)port);
658
767
}
659
768
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
769
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
770
ip, (uintmax_t)port);
662
771
}
663
772
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
773
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
671
780
sizeof(addrstr));
672
781
}
673
782
if(pcret == NULL){
674
perror("inet_ntop");
783
perror_plus("inet_ntop");
675
784
} else {
676
785
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
786
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
678
787
}
679
788
}
680
789
}
692
801
if(ret < 0){
693
802
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
803
int e = errno;
695
perror("connect");
804
perror_plus("connect");
696
805
errno = e;
697
806
}
698
807
goto mandos_end;
708
817
while(true){
709
818
size_t out_size = strlen(out);
710
819
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
out_size - written));
820
out_size - written));
712
821
if(ret == -1){
713
822
int e = errno;
714
perror("write");
823
perror_plus("write");
715
824
errno = e;
716
825
goto mandos_end;
717
826
}
734
843
}
735
844
736
845
if(debug){
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
846
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
738
847
}
739
848
740
849
if(quit_now){
742
851
goto mandos_end;
743
852
}
744
853
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
854
/* This casting via intptr_t is to eliminate warning about casting
855
an int to a pointer type. This is exactly how the GnuTLS Guile
856
function "set-session-transport-fd!" does it. */
857
gnutls_transport_set_ptr(session,
858
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
746
859
747
860
if(quit_now){
748
861
errno = EINTR;
759
872
760
873
if(ret != GNUTLS_E_SUCCESS){
761
874
if(debug){
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
875
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
763
876
gnutls_perror(ret);
764
877
}
765
878
errno = EPROTO;
769
882
/* Read OpenPGP packet that contains the wanted password */
770
883
771
884
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
885
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
886
" %s\n", ip);
774
887
}
775
888
776
889
while(true){
781
894
}
782
895
783
896
buffer_capacity = incbuffer(&buffer, buffer_length,
784
buffer_capacity);
897
buffer_capacity);
785
898
if(buffer_capacity == 0){
786
899
int e = errno;
787
perror("incbuffer");
900
perror_plus("incbuffer");
788
901
errno = e;
789
902
goto mandos_end;
790
903
}
814
927
}
815
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
929
if(ret < 0){
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
930
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
931
"***\n");
818
932
gnutls_perror(ret);
819
933
errno = EPROTO;
820
934
goto mandos_end;
821
935
}
822
936
break;
823
937
default:
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
938
fprintf_plus(stderr, "Unknown error while reading data from"
939
" encrypted session with Mandos server\n");
826
940
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
941
errno = EIO;
828
942
goto mandos_end;
833
947
}
834
948
835
949
if(debug){
836
fprintf(stderr, "Closing TLS session\n");
950
fprintf_plus(stderr, "Closing TLS session\n");
837
951
}
838
952
839
953
if(quit_now){
851
965
852
966
if(buffer_length > 0){
853
967
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
856
&decrypted_buffer);
968
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
969
&decrypted_buffer, mc);
857
970
if(decrypted_buffer_size >= 0){
858
971
859
972
written = 0;
869
982
if(ret == 0 and ferror(stdout)){
870
983
int e = errno;
871
984
if(debug){
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
985
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
986
strerror(errno));
874
987
}
875
988
errno = e;
876
989
goto mandos_end;
895
1008
if(e == 0){
896
1009
e = errno;
897
1010
}
898
perror("close");
1011
perror_plus("close");
899
1012
}
900
1013
gnutls_deinit(session);
1014
errno = e;
901
1015
if(quit_now){
902
e = EINTR;
1016
errno = EINTR;
903
1017
retval = -1;
904
1018
}
905
errno = e;
906
1019
}
907
1020
return retval;
908
1021
}
920
1033
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
1034
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
1035
flags,
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
1036
void* mc){
1037
if(r == NULL){
1038
return;
1039
}
925
1040
926
1041
/* Called whenever a service has been resolved successfully or
927
1042
timed out */
933
1048
switch(event){
934
1049
default:
935
1050
case AVAHI_RESOLVER_FAILURE:
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
1051
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1052
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1053
domain,
1054
avahi_strerror(avahi_server_errno
1055
(((mandos_context*)mc)->server)));
939
1056
break;
940
1057
941
1058
case AVAHI_RESOLVER_FOUND:
943
1060
char ip[AVAHI_ADDRESS_STR_MAX];
944
1061
avahi_address_snprint(ip, sizeof(ip), address);
945
1062
if(debug){
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
1063
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1064
PRIdMAX ") on port %" PRIu16 "\n", name,
1065
host_name, ip, (intmax_t)interface, port);
949
1066
}
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
1067
int ret = start_mandos_communication(ip, (in_port_t)port,
1068
interface,
1069
avahi_proto_to_af(proto),
1070
mc);
952
1071
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
1072
avahi_simple_poll_quit(simple_poll);
1073
} else {
1074
if(not add_server(ip, (in_port_t)port, interface,
1075
avahi_proto_to_af(proto),
1076
&((mandos_context*)mc)->current_server)){
1077
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1078
" list\n", name);
1079
}
954
1080
}
955
1081
}
956
1082
}
966
1092
const char *domain,
967
1093
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
1094
flags,
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
1095
void* mc){
1096
if(b == NULL){
1097
return;
1098
}
971
1099
972
1100
/* Called whenever a new services becomes available on the LAN or
973
1101
is removed from the LAN */
980
1108
default:
981
1109
case AVAHI_BROWSER_FAILURE:
982
1110
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1111
fprintf_plus(stderr, "(Avahi browser) %s\n",
1112
avahi_strerror(avahi_server_errno
1113
(((mandos_context*)mc)->server)));
1114
avahi_simple_poll_quit(simple_poll);
986
1115
return;
987
1116
988
1117
case AVAHI_BROWSER_NEW:
991
1120
the callback function is called the Avahi server will free the
992
1121
resolver for us. */
993
1122
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1123
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1124
interface, protocol, name, type,
1125
domain, protocol, 0,
1126
resolve_callback, mc) == NULL)
1127
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1128
" %s\n", name,
1129
avahi_strerror(avahi_server_errno
1130
(((mandos_context*)mc)->server)));
999
1131
break;
1000
1132
1001
1133
case AVAHI_BROWSER_REMOVE:
1004
1136
case AVAHI_BROWSER_ALL_FOR_NOW:
1005
1137
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1006
1138
if(debug){
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1139
fprintf_plus(stderr, "No Mandos server found, still"
1140
" searching...\n");
1008
1141
}
1009
1142
break;
1010
1143
}
1011
1144
}
1012
1145
1013
/* stop main loop after sigterm has been called */
1146
/* Signal handler that stops main loop after SIGTERM */
1014
1147
static void handle_sigterm(int sig){
1015
1148
if(quit_now){
1016
1149
return;
1018
1151
quit_now = 1;
1019
1152
signal_received = sig;
1020
1153
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1154
/* set main loop to exit */
1155
if(simple_poll != NULL){
1156
avahi_simple_poll_quit(simple_poll);
1023
1157
}
1024
1158
errno = old_errno;
1025
1159
}
1026
1160
1161
bool get_flags(const char *ifname, struct ifreq *ifr){
1162
int ret;
1163
error_t ret_errno;
1164
1165
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1166
if(s < 0){
1167
ret_errno = errno;
1168
perror_plus("socket");
1169
errno = ret_errno;
1170
return false;
1171
}
1172
strcpy(ifr->ifr_name, ifname);
1173
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1174
if(ret == -1){
1175
if(debug){
1176
ret_errno = errno;
1177
perror_plus("ioctl SIOCGIFFLAGS");
1178
errno = ret_errno;
1179
}
1180
return false;
1181
}
1182
return true;
1183
}
1184
1185
bool good_flags(const char *ifname, const struct ifreq *ifr){
1186
1187
/* Reject the loopback device */
1188
if(ifr->ifr_flags & IFF_LOOPBACK){
1189
if(debug){
1190
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1191
ifname);
1192
}
1193
return false;
1194
}
1195
/* Accept point-to-point devices only if connect_to is specified */
1196
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1197
if(debug){
1198
fprintf_plus(stderr, "Accepting point-to-point interface"
1199
" \"%s\"\n", ifname);
1200
}
1201
return true;
1202
}
1203
/* Otherwise, reject non-broadcast-capable devices */
1204
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1205
if(debug){
1206
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1207
" \"%s\"\n", ifname);
1208
}
1209
return false;
1210
}
1211
/* Reject non-ARP interfaces (including dummy interfaces) */
1212
if(ifr->ifr_flags & IFF_NOARP){
1213
if(debug){
1214
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1215
ifname);
1216
}
1217
return false;
1218
}
1219
1220
/* Accept this device */
1221
if(debug){
1222
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1223
}
1224
return true;
1225
}
1226
1027
1227
/*
1028
1228
* This function determines if a directory entry in /sys/class/net
1029
1229
* corresponds to an acceptable network device.
1030
1230
* (This function is passed to scandir(3) as a filter function.)
1031
1231
*/
1032
1232
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
1233
if(if_entry->d_name[0] == '.'){
1042
1234
return 0;
1043
1235
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1236
1237
struct ifreq ifr;
1238
if(not get_flags(if_entry->d_name, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", if_entry->d_name);
1242
}
1243
return 0;
1244
}
1245
1246
if(not good_flags(if_entry->d_name, &ifr)){
1247
return 0;
1248
}
1249
return 1;
1250
}
1251
1252
/*
1253
* This function determines if a network interface is up.
1254
*/
1255
bool interface_is_up(const char *interface){
1256
struct ifreq ifr;
1257
if(not get_flags(interface, &ifr)){
1258
if(debug){
1259
fprintf_plus(stderr, "Failed to get flags for interface "
1260
"\"%s\"\n", interface);
1261
}
1262
return false;
1263
}
1264
1265
return (bool)(ifr.ifr_flags & IFF_UP);
1266
}
1267
1268
/*
1269
* This function determines if a network interface is running
1270
*/
1271
bool interface_is_running(const char *interface){
1272
struct ifreq ifr;
1273
if(not get_flags(interface, &ifr)){
1274
if(debug){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1277
}
1278
return false;
1279
}
1280
1281
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1282
}
1283
1284
int notdotentries(const struct dirent *direntry){
1285
/* Skip "." and ".." */
1286
if(direntry->d_name[0] == '.'
1287
and (direntry->d_name[1] == '\0'
1288
or (direntry->d_name[1] == '.'
1289
and direntry->d_name[2] == '\0'))){
1290
return 0;
1291
}
1292
return 1;
1293
}
1294
1295
/* Is this directory entry a runnable program? */
1296
int runnable_hook(const struct dirent *direntry){
1297
int ret;
1298
size_t sret;
1299
struct stat st;
1300
1301
if((direntry->d_name)[0] == '\0'){
1302
/* Empty name? */
1303
return 0;
1304
}
1305
1306
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1307
"abcdefghijklmnopqrstuvwxyz"
1308
"0123456789"
1309
"_-");
1310
if((direntry->d_name)[sret] != '\0'){
1311
/* Contains non-allowed characters */
1312
if(debug){
1313
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1314
direntry->d_name);
1315
}
1316
return 0;
1317
}
1318
1319
char *fullname = NULL;
1320
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1321
if(ret < 0){
1322
perror_plus("asprintf");
1323
return 0;
1324
}
1325
1326
ret = stat(fullname, &st);
1327
if(ret == -1){
1328
if(debug){
1329
perror_plus("Could not stat hook");
1330
}
1331
return 0;
1332
}
1333
if(not (S_ISREG(st.st_mode))){
1334
/* Not a regular file */
1335
if(debug){
1336
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1337
direntry->d_name);
1338
}
1339
return 0;
1340
}
1341
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1342
/* Not executable */
1343
if(debug){
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1345
direntry->d_name);
1346
}
1347
return 0;
1348
}
1349
if(debug){
1350
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1351
direntry->d_name);
1352
}
1353
return 1;
1354
}
1355
1356
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1357
mandos_context *mc){
1358
int ret;
1359
struct timespec now;
1360
struct timespec waited_time;
1361
intmax_t block_time;
1362
1363
while(true){
1364
if(mc->current_server == NULL){
1365
if (debug){
1366
fprintf_plus(stderr, "Wait until first server is found."
1367
" No timeout!\n");
1368
}
1369
ret = avahi_simple_poll_iterate(s, -1);
1370
} else {
1371
if (debug){
1372
fprintf_plus(stderr, "Check current_server if we should run"
1373
" it, or wait\n");
1374
}
1375
/* the current time */
1376
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1377
if(ret == -1){
1378
perror_plus("clock_gettime");
1379
return -1;
1380
}
1381
/* Calculating in ms how long time between now and server
1382
who we visted longest time ago. Now - last seen. */
1383
waited_time.tv_sec = (now.tv_sec
1384
- mc->current_server->last_seen.tv_sec);
1385
waited_time.tv_nsec = (now.tv_nsec
1386
- mc->current_server->last_seen.tv_nsec);
1387
/* total time is 10s/10,000ms.
1388
Converting to s from ms by dividing by 1,000,
1389
and ns to ms by dividing by 1,000,000. */
1390
block_time = ((retry_interval
1391
- ((intmax_t)waited_time.tv_sec * 1000))
1392
- ((intmax_t)waited_time.tv_nsec / 1000000));
1393
1394
if (debug){
1395
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1396
block_time);
1397
}
1398
1399
if(block_time <= 0){
1400
ret = start_mandos_communication(mc->current_server->ip,
1401
mc->current_server->port,
1402
mc->current_server->if_index,
1403
mc->current_server->af, mc);
1404
if(ret == 0){
1405
avahi_simple_poll_quit(s);
1406
return 0;
1407
}
1408
ret = clock_gettime(CLOCK_MONOTONIC,
1409
&mc->current_server->last_seen);
1410
if(ret == -1){
1411
perror_plus("clock_gettime");
1412
return -1;
1413
}
1414
mc->current_server = mc->current_server->next;
1415
block_time = 0; /* Call avahi to find new Mandos
1416
servers, but don't block */
1417
}
1418
1419
ret = avahi_simple_poll_iterate(s, (int)block_time);
1420
}
1421
if(ret != 0){
1422
if (ret > 0 or errno != EINTR){
1423
return (ret != 1) ? ret : 0;
1424
}
1425
}
1426
}
1427
}
1428
1429
/* Set effective uid to 0, return errno */
1430
error_t raise_privileges(void){
1431
error_t old_errno = errno;
1432
error_t ret_errno = 0;
1433
if(seteuid(0) == -1){
1434
ret_errno = errno;
1435
perror_plus("seteuid");
1436
}
1437
errno = old_errno;
1438
return ret_errno;
1439
}
1440
1441
/* Set effective and real user ID to 0. Return errno. */
1442
error_t raise_privileges_permanently(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = raise_privileges();
1445
if(ret_errno != 0){
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
if(setuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective user ID to unprivileged saved user ID */
1458
error_t lower_privileges(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = 0;
1461
if(seteuid(uid) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Lower privileges permanently */
1470
error_t lower_privileges_permanently(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(setuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("setuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
bool run_network_hooks(const char *mode, const char *interface,
1482
const float delay){
1483
struct dirent **direntries;
1484
struct dirent *direntry;
1485
int ret;
1486
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1487
alphasort);
1488
if(numhooks == -1){
1489
if(errno == ENOENT){
1490
if(debug){
1491
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1492
" found\n", hookdir);
1493
}
1494
} else {
1495
perror_plus("scandir");
1496
}
1497
} else {
1498
int devnull = open("/dev/null", O_RDONLY);
1499
for(int i = 0; i < numhooks; i++){
1500
direntry = direntries[i];
1501
char *fullname = NULL;
1502
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1503
if(ret < 0){
1504
perror_plus("asprintf");
1505
continue;
1506
}
1507
if(debug){
1508
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1509
direntry->d_name);
1510
}
1511
pid_t hook_pid = fork();
1512
if(hook_pid == 0){
1513
/* Child */
1514
/* Raise privileges */
1515
raise_privileges_permanently();
1516
/* Set group */
1517
errno = 0;
1518
ret = setgid(0);
1519
if(ret == -1){
1520
perror_plus("setgid");
1521
}
1522
/* Reset supplementary groups */
1523
errno = 0;
1524
ret = setgroups(0, NULL);
1525
if(ret == -1){
1526
perror_plus("setgroups");
1527
}
1528
dup2(devnull, STDIN_FILENO);
1529
close(devnull);
1530
dup2(STDERR_FILENO, STDOUT_FILENO);
1531
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1532
if(ret == -1){
1533
perror_plus("setenv");
1534
_exit(EX_OSERR);
1535
}
1536
ret = setenv("DEVICE", interface, 1);
1537
if(ret == -1){
1538
perror_plus("setenv");
1539
_exit(EX_OSERR);
1540
}
1541
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("MODE", mode, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
char *delaystring;
1552
ret = asprintf(&delaystring, "%f", delay);
1553
if(ret == -1){
1554
perror_plus("asprintf");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("DELAY", delaystring, 1);
1558
if(ret == -1){
1559
free(delaystring);
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
1563
free(delaystring);
1564
if(connect_to != NULL){
1565
ret = setenv("CONNECT", connect_to, 1);
1566
if(ret == -1){
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
}
1571
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1572
perror_plus("execl");
1573
_exit(EXIT_FAILURE);
1574
}
1575
} else {
1576
int status;
1577
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1578
perror_plus("waitpid");
1579
free(fullname);
1580
continue;
1581
}
1582
if(WIFEXITED(status)){
1583
if(WEXITSTATUS(status) != 0){
1584
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1585
" with status %d\n", direntry->d_name,
1586
WEXITSTATUS(status));
1587
free(fullname);
1588
continue;
1589
}
1590
} else if(WIFSIGNALED(status)){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1592
" signal %d\n", direntry->d_name,
1593
WTERMSIG(status));
1594
free(fullname);
1595
continue;
1596
} else {
1597
fprintf_plus(stderr, "Warning: network hook \"%s\""
1598
" crashed\n", direntry->d_name);
1599
free(fullname);
1600
continue;
1601
}
1602
}
1603
free(fullname);
1604
if(debug){
1605
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1606
direntry->d_name);
1607
}
1608
}
1609
close(devnull);
1610
}
1611
return true;
1612
}
1613
1614
error_t bring_up_interface(const char *const interface,
1615
const float delay){
1616
int sd = -1;
1617
error_t old_errno = errno;
1618
error_t ret_errno = 0;
1619
int ret, ret_setflags;
1620
struct ifreq network;
1621
unsigned int if_index = if_nametoindex(interface);
1622
if(if_index == 0){
1623
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1624
errno = old_errno;
1625
return ENXIO;
1626
}
1627
1628
if(quit_now){
1629
errno = old_errno;
1630
return EINTR;
1631
}
1632
1633
if(not interface_is_up(interface)){
1634
if(not get_flags(interface, &network) and debug){
1635
ret_errno = errno;
1636
fprintf_plus(stderr, "Failed to get flags for interface "
1637
"\"%s\"\n", interface);
1638
return ret_errno;
1639
}
1640
network.ifr_flags |= IFF_UP;
1641
1642
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
if(sd < 0){
1644
ret_errno = errno;
1645
perror_plus("socket");
1646
errno = old_errno;
1647
return ret_errno;
1648
}
1649
1650
if(quit_now){
1651
close(sd);
1652
errno = old_errno;
1653
return EINTR;
1654
}
1655
1656
if(debug){
1657
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1658
interface);
1659
}
1660
1661
/* Raise priviliges */
1662
raise_privileges();
1663
1664
#ifdef __linux__
1665
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1666
messages about the network interface to mess up the prompt */
1667
int ret_linux = klogctl(8, NULL, 5);
1668
bool restore_loglevel = true;
1669
if(ret_linux == -1){
1670
restore_loglevel = false;
1671
perror_plus("klogctl");
1672
}
1673
#endif /* __linux__ */
1674
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1675
ret_errno = errno;
1676
#ifdef __linux__
1677
if(restore_loglevel){
1678
ret_linux = klogctl(7, NULL, 0);
1679
if(ret_linux == -1){
1680
perror_plus("klogctl");
1681
}
1682
}
1683
#endif /* __linux__ */
1684
1685
/* Lower privileges */
1686
lower_privileges();
1687
1688
/* Close the socket */
1689
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1690
if(ret == -1){
1691
perror_plus("close");
1692
}
1693
1694
if(ret_setflags == -1){
1695
errno = ret_errno;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
errno = old_errno;
1698
return ret_errno;
1699
}
1700
} else if(debug){
1701
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1702
interface);
1703
}
1704
1705
/* Sleep checking until interface is running.
1706
Check every 0.25s, up to total time of delay */
1707
for(int i=0; i < delay * 4; i++){
1708
if(interface_is_running(interface)){
1070
1709
break;
1071
1710
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1114
/* Accept this device */
1115
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1711
struct timespec sleeptime = { .tv_nsec = 250000000 };
1712
ret = nanosleep(&sleeptime, NULL);
1713
if(ret == -1 and errno != EINTR){
1714
perror_plus("nanosleep");
1715
}
1716
}
1717
1718
errno = old_errno;
1719
return 0;
1720
}
1721
1722
error_t take_down_interface(const char *const interface){
1723
int sd = -1;
1724
error_t old_errno = errno;
1725
error_t ret_errno = 0;
1726
int ret, ret_setflags;
1727
struct ifreq network;
1728
unsigned int if_index = if_nametoindex(interface);
1729
if(if_index == 0){
1730
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1731
errno = old_errno;
1732
return ENXIO;
1733
}
1734
if(interface_is_up(interface)){
1735
if(not get_flags(interface, &network) and debug){
1736
ret_errno = errno;
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1739
return ret_errno;
1740
}
1741
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1742
1743
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1744
if(sd < 0){
1745
ret_errno = errno;
1746
perror_plus("socket");
1747
errno = old_errno;
1748
return ret_errno;
1749
}
1750
1751
if(debug){
1752
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1753
interface);
1754
}
1755
1756
/* Raise priviliges */
1757
raise_privileges();
1758
1759
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1760
ret_errno = errno;
1761
1762
/* Lower privileges */
1763
lower_privileges();
1764
1765
/* Close the socket */
1766
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1767
if(ret == -1){
1768
perror_plus("close");
1769
}
1770
1771
if(ret_setflags == -1){
1772
errno = ret_errno;
1773
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1774
errno = old_errno;
1775
return ret_errno;
1776
}
1777
} else if(debug){
1778
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1779
interface);
1780
}
1781
1782
errno = old_errno;
1783
return 0;
1120
1784
}
1121
1785
1122
1786
int main(int argc, char *argv[]){
1787
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1788
.priority = "SECURE256:!CTYPE-X.509:"
1789
"+CTYPE-OPENPGP", .current_server = NULL,
1790
.interfaces = NULL, .interfaces_size = 0 };
1123
1791
AvahiSServiceBrowser *sb = NULL;
1124
int error;
1792
error_t ret_errno;
1125
1793
int ret;
1126
1794
intmax_t tmpmax;
1127
1795
char *tmp;
1128
1796
int exitcode = EXIT_SUCCESS;
1129
const char *interface = "";
1130
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
1133
uid_t uid;
1134
gid_t gid;
1797
char *interfaces_to_take_down = NULL;
1798
size_t interfaces_to_take_down_size = 0;
1135
1799
char tempdir[] = "/tmp/mandosXXXXXX";
1136
1800
bool tempdir_created = false;
1137
1801
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1138
1802
const char *seckey = PATHDIR "/" SECKEY;
1139
1803
const char *pubkey = PATHDIR "/" PUBKEY;
1804
char *interfaces_hooks = NULL;
1805
size_t interfaces_hooks_size = 0;
1140
1806
1141
1807
bool gnutls_initialized = false;
1142
1808
bool gpgme_initialized = false;
1143
1809
float delay = 2.5f;
1810
double retry_interval = 10; /* 10s between trying a server and
1811
retrying the same server again */
1144
1812
1145
1813
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
1814
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1152
1820
errno = 0;
1153
1821
ret = setgid(gid);
1154
1822
if(ret == -1){
1155
perror("setgid");
1823
perror_plus("setgid");
1156
1824
}
1157
1825
1158
1826
/* Lower user privileges (temporarily) */
1159
1827
errno = 0;
1160
1828
ret = seteuid(uid);
1161
1829
if(ret == -1){
1162
perror("seteuid");
1830
perror_plus("seteuid");
1163
1831
}
1164
1832
1165
1833
if(quit_now){
1200
1868
.arg = "SECONDS",
1201
1869
.doc = "Maximum delay to wait for interface startup",
1202
1870
.group = 2 },
1871
{ .name = "retry", .key = 132,
1872
.arg = "SECONDS",
1873
.doc = "Retry interval used when denied by the Mandos server",
1874
.group = 2 },
1875
{ .name = "network-hook-dir", .key = 133,
1876
.arg = "DIR",
1877
.doc = "Directory where network hooks are located",
1878
.group = 2 },
1203
1879
/*
1204
1880
* These reproduce what we would get without ARGP_NO_HELP
1205
1881
*/
1223
1899
connect_to = arg;
1224
1900
break;
1225
1901
case 'i': /* --interface */
1226
interface = arg;
1902
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1903
arg, (int)',');
1904
if(ret_errno != 0){
1905
argp_error(state, "%s", strerror(ret_errno));
1906
}
1227
1907
break;
1228
1908
case 's': /* --seckey */
1229
1909
seckey = arg;
1249
1929
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
1930
argp_error(state, "Bad delay");
1251
1931
}
1932
case 132: /* --retry */
1933
errno = 0;
1934
retry_interval = strtod(arg, &tmp);
1935
if(errno != 0 or tmp == arg or *tmp != '\0'
1936
or (retry_interval * 1000) > INT_MAX
1937
or retry_interval < 0){
1938
argp_error(state, "Bad retry interval");
1939
}
1940
break;
1941
case 133: /* --network-hook-dir */
1942
hookdir = arg;
1252
1943
break;
1253
1944
/*
1254
1945
* These reproduce what we would get without ARGP_NO_HELP
1261
1952
argp_state_help(state, state->out_stream,
1262
1953
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
1954
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1955
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1265
1956
exit(argp_err_exit_status);
1266
1957
break;
1267
1958
default:
1282
1973
case ENOMEM:
1283
1974
default:
1284
1975
errno = ret;
1285
perror("argp_parse");
1976
perror_plus("argp_parse");
1286
1977
exitcode = EX_OSERR;
1287
1978
goto end;
1288
1979
case EINVAL:
1290
1981
goto end;
1291
1982
}
1292
1983
}
1984
1985
{
1986
/* Work around Debian bug #633582:
1987
<http://bugs.debian.org/633582> */
1988
1989
/* Re-raise priviliges */
1990
if(raise_privileges() == 0){
1991
struct stat st;
1992
1993
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1994
int seckey_fd = open(seckey, O_RDONLY);
1995
if(seckey_fd == -1){
1996
perror_plus("open");
1997
} else {
1998
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1999
if(ret == -1){
2000
perror_plus("fstat");
2001
} else {
2002
if(S_ISREG(st.st_mode)
2003
and st.st_uid == 0 and st.st_gid == 0){
2004
ret = fchown(seckey_fd, uid, gid);
2005
if(ret == -1){
2006
perror_plus("fchown");
2007
}
2008
}
2009
}
2010
TEMP_FAILURE_RETRY(close(seckey_fd));
2011
}
2012
}
2013
2014
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2015
int pubkey_fd = open(pubkey, O_RDONLY);
2016
if(pubkey_fd == -1){
2017
perror_plus("open");
2018
} else {
2019
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2020
if(ret == -1){
2021
perror_plus("fstat");
2022
} else {
2023
if(S_ISREG(st.st_mode)
2024
and st.st_uid == 0 and st.st_gid == 0){
2025
ret = fchown(pubkey_fd, uid, gid);
2026
if(ret == -1){
2027
perror_plus("fchown");
2028
}
2029
}
2030
}
2031
TEMP_FAILURE_RETRY(close(pubkey_fd));
2032
}
2033
}
2034
2035
/* Lower privileges */
2036
lower_privileges();
2037
}
2038
}
2039
2040
/* Remove invalid interface names (except "none") */
2041
{
2042
char *interface = NULL;
2043
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2044
interface))){
2045
if(strcmp(interface, "none") != 0
2046
and if_nametoindex(interface) == 0){
2047
if(interface[0] != '\0'){
2048
fprintf_plus(stderr, "Not using nonexisting interface"
2049
" \"%s\"\n", interface);
2050
}
2051
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2052
interface = NULL;
2053
}
2054
}
2055
}
2056
2057
/* Run network hooks */
2058
{
2059
if(mc.interfaces != NULL){
2060
interfaces_hooks = malloc(mc.interfaces_size);
2061
if(interfaces_hooks == NULL){
2062
perror_plus("malloc");
2063
goto end;
2064
}
2065
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2066
interfaces_hooks_size = mc.interfaces_size;
2067
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2068
(int)',');
2069
}
2070
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2071
interfaces_hooks : "", delay)){
2072
goto end;
2073
}
2074
}
1293
2075
1294
2076
if(not debug){
1295
2077
avahi_set_log_function(empty_log);
1296
2078
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
}
1322
2079
1323
2080
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
2081
from the signal handler */
1325
2082
/* Initialize the pseudo-RNG for Avahi */
1326
2083
srand((unsigned int) time(NULL));
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2084
simple_poll = avahi_simple_poll_new();
2085
if(simple_poll == NULL){
2086
fprintf_plus(stderr,
2087
"Avahi: Failed to create simple poll object.\n");
1330
2088
exitcode = EX_UNAVAILABLE;
1331
2089
goto end;
1332
2090
}
1334
2092
sigemptyset(&sigterm_action.sa_mask);
1335
2093
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
2094
if(ret == -1){
1337
perror("sigaddset");
2095
perror_plus("sigaddset");
1338
2096
exitcode = EX_OSERR;
1339
2097
goto end;
1340
2098
}
1341
2099
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
2100
if(ret == -1){
1343
perror("sigaddset");
2101
perror_plus("sigaddset");
1344
2102
exitcode = EX_OSERR;
1345
2103
goto end;
1346
2104
}
1347
2105
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
2106
if(ret == -1){
1349
perror("sigaddset");
2107
perror_plus("sigaddset");
1350
2108
exitcode = EX_OSERR;
1351
2109
goto end;
1352
2110
}
1356
2114
*/
1357
2115
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
2116
if(ret == -1){
1359
perror("sigaction");
2117
perror_plus("sigaction");
1360
2118
return EX_OSERR;
1361
2119
}
1362
2120
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
2121
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
2122
if(ret == -1){
1365
perror("sigaction");
2123
perror_plus("sigaction");
1366
2124
exitcode = EX_OSERR;
1367
2125
goto end;
1368
2126
}
1369
2127
}
1370
2128
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
2129
if(ret == -1){
1372
perror("sigaction");
2130
perror_plus("sigaction");
1373
2131
return EX_OSERR;
1374
2132
}
1375
2133
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
2134
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
2135
if(ret == -1){
1378
perror("sigaction");
2136
perror_plus("sigaction");
1379
2137
exitcode = EX_OSERR;
1380
2138
goto end;
1381
2139
}
1382
2140
}
1383
2141
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
2142
if(ret == -1){
1385
perror("sigaction");
2143
perror_plus("sigaction");
1386
2144
return EX_OSERR;
1387
2145
}
1388
2146
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
2147
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
2148
if(ret == -1){
1391
perror("sigaction");
1392
exitcode = EX_OSERR;
1393
goto end;
1394
}
1395
}
1396
1397
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1417
#ifdef __linux__
1418
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1420
ret = klogctl(8, NULL, 5);
1421
bool restore_loglevel = true;
1422
if(ret == -1){
1423
restore_loglevel = false;
1424
perror("klogctl");
1425
}
1426
#endif /* __linux__ */
1427
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
if(sd < 0){
1430
perror("socket");
1431
exitcode = EX_OSERR;
1432
#ifdef __linux__
1433
if(restore_loglevel){
1434
ret = klogctl(7, NULL, 0);
1435
if(ret == -1){
1436
perror("klogctl");
1437
}
1438
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1446
goto end;
1447
}
1448
strcpy(network.ifr_name, interface);
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1452
#ifdef __linux__
1453
if(restore_loglevel){
1454
ret = klogctl(7, NULL, 0);
1455
if(ret == -1){
1456
perror("klogctl");
1457
}
1458
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1467
goto end;
1468
}
1469
if((network.ifr_flags & IFF_UP) == 0){
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1477
#ifdef __linux__
1478
if(restore_loglevel){
1479
ret = klogctl(7, NULL, 0);
1480
if(ret == -1){
1481
perror("klogctl");
2149
perror_plus("sigaction");
2150
exitcode = EX_OSERR;
2151
goto end;
2152
}
2153
}
2154
2155
/* If no interfaces were specified, make a list */
2156
if(mc.interfaces == NULL){
2157
struct dirent **direntries;
2158
/* Look for any good interfaces */
2159
ret = scandir(sys_class_net, &direntries, good_interface,
2160
alphasort);
2161
if(ret >= 1){
2162
/* Add all found interfaces to interfaces list */
2163
for(int i = 0; i < ret; ++i){
2164
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2165
direntries[i]->d_name);
2166
if(ret_errno != 0){
2167
perror_plus("argz_add");
2168
continue;
2169
}
2170
if(debug){
2171
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2172
direntries[i]->d_name);
2173
}
2174
}
2175
free(direntries);
2176
} else {
2177
free(direntries);
2178
fprintf_plus(stderr, "Could not find a network interface\n");
2179
exitcode = EXIT_FAILURE;
2180
goto end;
2181
}
2182
}
2183
2184
/* Bring up interfaces which are down */
2185
{
2186
char *interface = NULL;
2187
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2188
interface))){
2189
/* If interface name is "none", stop bringing up interfaces.
2190
Also remove all instances of "none" from the list */
2191
if(strcmp(interface, "none") == 0){
2192
argz_delete(&mc.interfaces, &mc.interfaces_size,
2193
interface);
2194
interface = NULL;
2195
while((interface = argz_next(mc.interfaces,
2196
mc.interfaces_size, interface))){
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
1482
2201
}
1483
2202
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1491
goto end;
1492
}
1493
}
1494
/* sleep checking until interface is running */
1495
for(int i=0; i < delay * 4; i++){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_RUNNING){
1500
2203
break;
1501
2204
}
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
ret = nanosleep(&sleeptime, NULL);
1504
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1506
}
1507
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1514
}
1515
#ifdef __linux__
1516
if(restore_loglevel){
1517
/* Restores kernel loglevel to default */
1518
ret = klogctl(7, NULL, 0);
1519
if(ret == -1){
1520
perror("klogctl");
1521
}
1522
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
1532
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
1538
}
2205
bool interface_was_up = interface_is_up(interface);
2206
ret = bring_up_interface(interface, delay);
2207
if(not interface_was_up){
2208
if(ret != 0){
2209
errno = ret;
2210
perror_plus("Failed to bring up interface");
2211
} else {
2212
ret_errno = argz_add(&interfaces_to_take_down,
2213
&interfaces_to_take_down_size,
2214
interface);
2215
}
2216
}
2217
}
2218
if(debug and (interfaces_to_take_down == NULL)){
2219
fprintf_plus(stderr, "No interfaces were brought up\n");
2220
}
2221
}
2222
2223
/* If we only got one interface, explicitly use only that one */
2224
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2225
if(debug){
2226
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2227
mc.interfaces);
2228
}
2229
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1539
2230
}
1540
2231
1541
2232
if(quit_now){
1542
2233
goto end;
1543
2234
}
1544
2235
1545
ret = init_gnutls_global(pubkey, seckey);
2236
ret = init_gnutls_global(pubkey, seckey, &mc);
1546
2237
if(ret == -1){
1547
fprintf(stderr, "init_gnutls_global failed\n");
2238
fprintf_plus(stderr, "init_gnutls_global failed\n");
1548
2239
exitcode = EX_UNAVAILABLE;
1549
2240
goto end;
1550
2241
} else {
1555
2246
goto end;
1556
2247
}
1557
2248
2249
if(mkdtemp(tempdir) == NULL){
2250
perror_plus("mkdtemp");
2251
goto end;
2252
}
1558
2253
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
1562
goto end;
1563
}
1564
2254
1565
2255
if(quit_now){
1566
2256
goto end;
1567
2257
}
1568
2258
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2259
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2260
fprintf_plus(stderr, "init_gpgme failed\n");
1571
2261
exitcode = EX_UNAVAILABLE;
1572
2262
goto end;
1573
2263
} else {
1582
2272
/* Connect directly, do not use Zeroconf */
1583
2273
/* (Mainly meant for debugging) */
1584
2274
char *address = strrchr(connect_to, ':');
2275
1585
2276
if(address == NULL){
1586
fprintf(stderr, "No colon in address\n");
2277
fprintf_plus(stderr, "No colon in address\n");
1587
2278
exitcode = EX_USAGE;
1588
2279
goto end;
1589
2280
}
1592
2283
goto end;
1593
2284
}
1594
2285
1595
uint16_t port;
2286
in_port_t port;
1596
2287
errno = 0;
1597
2288
tmpmax = strtoimax(address+1, &tmp, 10);
1598
2289
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2290
or tmpmax != (in_port_t)tmpmax){
2291
fprintf_plus(stderr, "Bad port number\n");
1601
2292
exitcode = EX_USAGE;
1602
2293
goto end;
1603
2294
}
1604
2295
1605
2296
if(quit_now){
1606
2297
goto end;
1607
2298
}
1608
2299
1609
port = (uint16_t)tmpmax;
2300
port = (in_port_t)tmpmax;
1610
2301
*address = '\0';
1611
address = connect_to;
1612
2302
/* Colon in address indicates IPv6 */
1613
2303
int af;
1614
if(strchr(address, ':') != NULL){
2304
if(strchr(connect_to, ':') != NULL){
1615
2305
af = AF_INET6;
2306
/* Accept [] around IPv6 address - see RFC 5952 */
2307
if(connect_to[0] == '[' and address[-1] == ']')
2308
{
2309
connect_to++;
2310
address[-1] = '\0';
2311
}
1616
2312
} else {
1617
2313
af = AF_INET;
1618
2314
}
2315
address = connect_to;
1619
2316
1620
2317
if(quit_now){
1621
2318
goto end;
1622
2319
}
1623
2320
1624
2321
while(not quit_now){
1625
ret = start_mandos_communication(address, port, if_index, af);
2322
ret = start_mandos_communication(address, port, if_index, af,
2323
&mc);
1626
2324
if(quit_now or ret == 0){
1627
2325
break;
1628
2326
}
1629
sleep(15);
1630
};
1631
2327
if(debug){
2328
fprintf_plus(stderr, "Retrying in %d seconds\n",
2329
(int)retry_interval);
2330
}
2331
sleep((int)retry_interval);
2332
}
2333
1632
2334
if (not quit_now){
1633
2335
exitcode = EXIT_SUCCESS;
1634
2336
}
1635
2337
1636
2338
goto end;
1637
2339
}
1638
2340
1650
2352
config.publish_domain = 0;
1651
2353
1652
2354
/* Allocate a new server */
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
2355
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2356
&config, NULL, NULL, &ret_errno);
1656
2357
1657
2358
/* Free the Avahi configuration data */
1658
2359
avahi_server_config_free(&config);
1660
2361
1661
2362
/* Check if creating the Avahi server object succeeded */
1662
2363
if(mc.server == NULL){
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2364
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2365
avahi_strerror(ret_errno));
1665
2366
exitcode = EX_UNAVAILABLE;
1666
2367
goto end;
1667
2368
}
1673
2374
/* Create the Avahi service browser */
1674
2375
sb = avahi_s_service_browser_new(mc.server, if_index,
1675
2376
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1676
NULL, 0, browse_callback, NULL);
2377
NULL, 0, browse_callback,
2378
(void *)&mc);
1677
2379
if(sb == NULL){
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2380
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2381
avahi_strerror(avahi_server_errno(mc.server)));
1680
2382
exitcode = EX_UNAVAILABLE;
1681
2383
goto end;
1682
2384
}
1688
2390
/* Run the main loop */
1689
2391
1690
2392
if(debug){
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2393
fprintf_plus(stderr, "Starting Avahi loop search\n");
2394
}
2395
2396
ret = avahi_loop_with_timeout(simple_poll,
2397
(int)(retry_interval * 1000), &mc);
2398
if(debug){
2399
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2400
(ret == 0) ? "successfully" : "with error");
2401
}
1695
2402
1696
2403
end:
1697
2404
1698
2405
if(debug){
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2406
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1700
2407
}
1701
2408
1702
2409
/* Cleanup things */
2410
free(mc.interfaces);
2411
1703
2412
if(sb != NULL)
1704
2413
avahi_s_service_browser_free(sb);
1705
2414
1706
2415
if(mc.server != NULL)
1707
2416
avahi_server_free(mc.server);
1708
2417
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
2418
if(simple_poll != NULL)
2419
avahi_simple_poll_free(simple_poll);
1711
2420
1712
2421
if(gnutls_initialized){
1713
2422
gnutls_certificate_free_credentials(mc.cred);
1719
2428
gpgme_release(mc.ctx);
1720
2429
}
1721
2430
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
2431
/* Cleans up the circular linked list of Mandos servers the client
2432
has seen */
2433
if(mc.current_server != NULL){
2434
mc.current_server->prev->next = NULL;
2435
while(mc.current_server != NULL){
2436
server *next = mc.current_server->next;
2437
free(mc.current_server);
2438
mc.current_server = next;
1729
2439
}
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2440
}
2441
2442
/* Re-raise priviliges */
2443
{
2444
raise_privileges();
2445
2446
/* Run network hooks */
2447
run_network_hooks("stop", interfaces_hooks != NULL ?
2448
interfaces_hooks : "", delay);
2449
2450
/* Take down the network interfaces which were brought up */
2451
{
2452
char *interface = NULL;
2453
while((interface=argz_next(interfaces_to_take_down,
2454
interfaces_to_take_down_size,
2455
interface))){
2456
ret_errno = take_down_interface(interface);
2457
if(ret_errno != 0){
2458
errno = ret_errno;
2459
perror_plus("Failed to take down interface");
1739
2460
}
1740
2461
}
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
2462
if(debug and (interfaces_to_take_down == NULL)){
2463
fprintf_plus(stderr, "No interfaces needed to be taken"
2464
" down\n");
1750
2465
}
1751
2466
}
2467
2468
lower_privileges_permanently();
1752
2469
}
1753
2470
1754
/* Removes the temp directory used by GPGME */
2471
free(interfaces_to_take_down);
2472
free(interfaces_hooks);
2473
2474
/* Removes the GPGME temp directory and all files inside */
1755
2475
if(tempdir_created){
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
2476
struct dirent **direntries = NULL;
2477
struct dirent *direntry = NULL;
2478
int numentries = scandir(tempdir, &direntries, notdotentries,
2479
alphasort);
2480
if (numentries > 0){
2481
for(int i = 0; i < numentries; i++){
2482
direntry = direntries[i];
1776
2483
char *fullname = NULL;
1777
2484
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
2485
direntry->d_name);
1779
2486
if(ret < 0){
1780
perror("asprintf");
2487
perror_plus("asprintf");
1781
2488
continue;
1782
2489
}
1783
2490
ret = remove(fullname);
1784
2491
if(ret == -1){
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2492
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2493
strerror(errno));
1787
2494
}
1788
2495
free(fullname);
1789
2496
}
1790
closedir(d);
2497
}
2498
2499
/* need to clean even if 0 because man page doesn't specify */
2500
free(direntries);
2501
if (numentries == -1){
2502
perror_plus("scandir");
1791
2503
}
1792
2504
ret = rmdir(tempdir);
1793
2505
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
2506
perror_plus("rmdir");
1795
2507
}
1796
2508
}
1797
2509
1802
2514
&old_sigterm_action,
1803
2515
NULL));
1804
2516
if(ret == -1){
1805
perror("sigaction");
2517
perror_plus("sigaction");
1806
2518
}
1807
2519
do {
1808
2520
ret = raise(signal_received);
1809
2521
} while(ret != 0 and errno == EINTR);
1810
2522
if(ret != 0){
1811
perror("raise");
2523
perror_plus("raise");
1812
2524
abort();
1813
2525
}
1814
2526
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0