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- Committer: Björn Påhlsson
- Date: 2011-06-18 22:51:12 UTC
- mto: This revision was merged to the branch mainline in revision 485.
- Revision ID: belorn@fukt.bsnet.se-20110618225112-rnt2m4ek32758f80
using scandir instead of readdir
- files removed:
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
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(), 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 */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
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(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
75
setgid(), pause() */
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,
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() */
94
87
95
88
#ifdef __linux__
96
89
#include <sys/klog.h> /* klogctl() */
114
107
init_gnutls_session(),
115
108
GNUTLS_* */
116
109
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
119
112
120
113
/* GPGME */
121
114
#include <gpgme.h> /* All GPGME types, constants and
129
122
#define PATHDIR "/conf/conf.d/mandos"
130
123
#define SECKEY "seckey.txt"
131
124
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
125
134
126
bool debug = false;
135
127
static const char mandos_protocol_version[] = "1";
136
128
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
138
130
static const char sys_class_net[] = "/sys/class/net";
139
131
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;
154
132
155
133
/* Used for passing in values through the Avahi callback functions */
156
134
typedef struct {
135
AvahiSimplePoll *simple_poll;
157
136
AvahiServer *server;
158
137
gnutls_certificate_credentials_t cred;
159
138
unsigned int dh_bits;
160
139
gnutls_dh_params_t dh_params;
161
140
const char *priority;
162
141
gpgme_ctx_t ctx;
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
142
} mandos_context;
167
143
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
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" };
170
148
171
149
sig_atomic_t quit_now = 0;
172
150
int signal_received = 0;
173
151
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 (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
193
152
/*
194
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
154
* bytes. "buffer_capacity" is how much is currently allocated,
196
155
* "buffer_length" is how much is already used.
197
156
*/
198
157
size_t incbuffer(char **buffer, size_t buffer_length,
199
size_t buffer_capacity){
158
size_t buffer_capacity){
200
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
161
if(buffer == NULL){
207
166
return buffer_capacity;
208
167
}
209
168
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
247
169
/*
248
170
* Initialize GPGME.
249
171
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
252
174
gpgme_error_t rc;
253
175
gpgme_engine_info_t engine_info;
254
176
177
255
178
/*
256
179
* Helper function to insert pub and seckey to the engine keyring.
257
180
*/
262
185
263
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
187
if(fd == -1){
265
perror_plus("open");
188
perror("open");
266
189
return false;
267
190
}
268
191
269
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
193
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
273
196
return false;
274
197
}
275
198
276
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
277
200
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
280
203
return false;
281
204
}
282
205
283
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
284
207
if(ret == -1){
285
perror_plus("close");
208
perror("close");
286
209
}
287
210
gpgme_data_release(pgp_data);
288
211
return true;
289
212
}
290
213
291
214
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
293
216
}
294
217
295
218
/* Init GPGME */
296
219
gpgme_check_version(NULL);
297
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
221
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
301
224
return false;
302
225
}
303
226
304
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
305
228
rc = gpgme_get_engine_info(&engine_info);
306
229
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
309
232
return false;
310
233
}
311
234
while(engine_info != NULL){
317
240
engine_info = engine_info->next;
318
241
}
319
242
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
322
244
return false;
323
245
}
324
246
325
247
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
327
249
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
331
252
return false;
332
253
}
333
254
344
265
*/
345
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
267
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
268
char **plaintext){
349
269
gpgme_data_t dh_crypto, dh_plain;
350
270
gpgme_error_t rc;
351
271
ssize_t ret;
353
273
ssize_t plaintext_length = 0;
354
274
355
275
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
357
277
}
358
278
359
279
/* Create new GPGME data buffer from memory cryptotext */
360
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
361
281
0);
362
282
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));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
365
285
return -1;
366
286
}
367
287
368
288
/* Create new empty GPGME data buffer for the plaintext */
369
289
rc = gpgme_data_new(&dh_plain);
370
290
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));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
374
293
gpgme_data_release(dh_crypto);
375
294
return -1;
376
295
}
377
296
378
297
/* Decrypt data from the cryptotext data buffer to the plaintext
379
298
data buffer */
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
300
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
384
303
plaintext_length = -1;
385
304
if(debug){
386
305
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
388
307
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
390
309
} 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);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
395
314
if(result->file_name != NULL){
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
397
316
}
398
317
gpgme_recipient_t recipient;
399
318
recipient = result->recipients;
400
319
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");
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");
408
326
recipient = recipient->next;
409
327
}
410
328
}
413
331
}
414
332
415
333
if(debug){
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
335
}
418
336
419
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
422
340
plaintext_length = -1;
423
341
goto decrypt_end;
424
342
}
426
344
*plaintext = NULL;
427
345
while(true){
428
346
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
431
349
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
435
353
}
436
354
437
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
442
360
break;
443
361
}
444
362
if(ret < 0){
445
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
446
364
plaintext_length = -1;
447
365
goto decrypt_end;
448
366
}
450
368
}
451
369
452
370
if(debug){
453
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
454
372
for(ssize_t i = 0; i < plaintext_length; i++){
455
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
374
}
468
386
}
469
387
470
388
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
472
391
if(ret == NULL)
473
392
ret = "(unknown)";
474
393
return ret;
477
396
/* GnuTLS log function callback */
478
397
static void debuggnutls(__attribute__((unused)) int level,
479
398
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
481
400
}
482
401
483
402
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
403
const char *seckeyfilename){
486
404
int ret;
487
405
488
406
if(debug){
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
490
408
}
491
409
492
410
ret = gnutls_global_init();
493
411
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
496
414
return -1;
497
415
}
498
416
505
423
}
506
424
507
425
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
509
427
if(ret != GNUTLS_E_SUCCESS){
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
512
433
gnutls_global_deinit();
513
434
return -1;
514
435
}
515
436
516
437
if(debug){
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
521
441
}
522
442
523
443
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
525
445
GNUTLS_OPENPGP_FMT_BASE64);
526
446
if(ret != GNUTLS_E_SUCCESS){
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));
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));
532
452
goto globalfail;
533
453
}
534
454
535
455
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
537
457
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
541
460
goto globalfail;
542
461
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
463
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
547
466
goto globalfail;
548
467
}
549
468
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
551
470
552
471
return 0;
553
472
554
473
globalfail:
555
474
556
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
557
476
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
477
gnutls_dh_params_deinit(mc.dh_params);
559
478
return -1;
560
479
}
561
480
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
481
static int init_gnutls_session(gnutls_session_t *session){
564
482
int ret;
565
483
/* GnuTLS session creation */
566
484
do {
570
488
}
571
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
572
490
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
576
493
}
577
494
578
495
{
579
496
const char *err;
580
497
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
499
if(quit_now){
583
500
gnutls_deinit(*session);
584
501
return -1;
585
502
}
586
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
587
504
if(ret != GNUTLS_E_SUCCESS){
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
591
508
gnutls_deinit(*session);
592
509
return -1;
593
510
}
595
512
596
513
do {
597
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
515
mc.cred);
599
516
if(quit_now){
600
517
gnutls_deinit(*session);
601
518
return -1;
602
519
}
603
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
604
521
if(ret != GNUTLS_E_SUCCESS){
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
607
524
gnutls_deinit(*session);
608
525
return -1;
609
526
}
611
528
/* ignore client certificate if any. */
612
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
530
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
532
616
533
return 0;
617
534
}
621
538
__attribute__((unused)) const char *txt){}
622
539
623
540
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
541
static int start_mandos_communication(const char *ip, uint16_t port,
625
542
AvahiIfIndex if_index,
626
int af, mandos_context *mc){
543
int af){
627
544
int ret, tcp_sd = -1;
628
545
ssize_t sret;
629
546
union {
654
571
pf = PF_INET;
655
572
break;
656
573
default:
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
658
575
errno = EINVAL;
659
576
return -1;
660
577
}
661
578
662
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
690
return -1;
691
}
692
}
693
694
ret = init_gnutls_session(&session, mc);
579
ret = init_gnutls_session(&session);
695
580
if(ret != 0){
696
581
return -1;
697
582
}
698
583
699
584
if(debug){
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
702
587
}
703
588
704
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
705
590
if(tcp_sd < 0){
706
591
int e = errno;
707
perror_plus("socket");
592
perror("socket");
708
593
errno = e;
709
594
goto mandos_end;
710
595
}
724
609
}
725
610
if(ret < 0 ){
726
611
int e = errno;
727
perror_plus("inet_pton");
612
perror("inet_pton");
728
613
errno = e;
729
614
goto mandos_end;
730
615
}
731
616
if(ret == 0){
732
617
int e = errno;
733
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
734
619
errno = e;
735
620
goto mandos_end;
736
621
}
737
622
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
743
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
748
630
if(if_index == AVAHI_IF_UNSPEC){
749
fprintf_plus(stderr, "An IPv6 link-local address is"
750
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
751
633
errno = EINVAL;
752
634
goto mandos_end;
753
635
}
755
637
to.in6.sin6_scope_id = (uint32_t)if_index;
756
638
}
757
639
} else {
758
to.in.sin_port = htons(port);
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
759
643
}
760
644
761
645
if(quit_now){
767
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
768
652
char interface[IF_NAMESIZE];
769
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
770
perror_plus("if_indextoname");
654
perror("if_indextoname");
771
655
} else {
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
774
658
}
775
659
} else {
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
778
662
}
779
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
780
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
787
671
sizeof(addrstr));
788
672
}
789
673
if(pcret == NULL){
790
perror_plus("inet_ntop");
674
perror("inet_ntop");
791
675
} else {
792
676
if(strcmp(addrstr, ip) != 0){
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
794
678
}
795
679
}
796
680
}
808
692
if(ret < 0){
809
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
810
694
int e = errno;
811
perror_plus("connect");
695
perror("connect");
812
696
errno = e;
813
697
}
814
698
goto mandos_end;
824
708
while(true){
825
709
size_t out_size = strlen(out);
826
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
827
out_size - written));
711
out_size - written));
828
712
if(ret == -1){
829
713
int e = errno;
830
perror_plus("write");
714
perror("write");
831
715
errno = e;
832
716
goto mandos_end;
833
717
}
850
734
}
851
735
852
736
if(debug){
853
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
854
738
}
855
739
856
740
if(quit_now){
857
741
errno = EINTR;
858
742
goto mandos_end;
859
743
}
860
861
/* This casting via intptr_t is to eliminate warning about casting
862
an int to a pointer type. This is exactly how the GnuTLS Guile
863
function "set-session-transport-fd!" does it. */
864
gnutls_transport_set_ptr(session,
865
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
744
745
/* Spurious warnings from -Wint-to-pointer-cast */
746
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
866
747
867
748
if(quit_now){
868
749
errno = EINTR;
879
760
880
761
if(ret != GNUTLS_E_SUCCESS){
881
762
if(debug){
882
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
763
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
883
764
gnutls_perror(ret);
884
765
}
885
766
errno = EPROTO;
889
770
/* Read OpenPGP packet that contains the wanted password */
890
771
891
772
if(debug){
892
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
893
" %s\n", ip);
773
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
774
ip);
894
775
}
895
776
896
777
while(true){
901
782
}
902
783
903
784
buffer_capacity = incbuffer(&buffer, buffer_length,
904
buffer_capacity);
785
buffer_capacity);
905
786
if(buffer_capacity == 0){
906
787
int e = errno;
907
perror_plus("incbuffer");
788
perror("incbuffer");
908
789
errno = e;
909
790
goto mandos_end;
910
791
}
934
815
}
935
816
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
936
817
if(ret < 0){
937
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
938
"***\n");
818
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
939
819
gnutls_perror(ret);
940
820
errno = EPROTO;
941
821
goto mandos_end;
942
822
}
943
823
break;
944
824
default:
945
fprintf_plus(stderr, "Unknown error while reading data from"
946
" encrypted session with Mandos server\n");
825
fprintf(stderr, "Unknown error while reading data from"
826
" encrypted session with Mandos server\n");
947
827
gnutls_bye(session, GNUTLS_SHUT_RDWR);
948
828
errno = EIO;
949
829
goto mandos_end;
954
834
}
955
835
956
836
if(debug){
957
fprintf_plus(stderr, "Closing TLS session\n");
837
fprintf(stderr, "Closing TLS session\n");
958
838
}
959
839
960
840
if(quit_now){
972
852
973
853
if(buffer_length > 0){
974
854
ssize_t decrypted_buffer_size;
975
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
976
&decrypted_buffer, mc);
855
decrypted_buffer_size = pgp_packet_decrypt(buffer,
856
buffer_length,
857
&decrypted_buffer);
977
858
if(decrypted_buffer_size >= 0){
978
859
979
860
written = 0;
989
870
if(ret == 0 and ferror(stdout)){
990
871
int e = errno;
991
872
if(debug){
992
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
993
strerror(errno));
873
fprintf(stderr, "Error writing encrypted data: %s\n",
874
strerror(errno));
994
875
}
995
876
errno = e;
996
877
goto mandos_end;
1015
896
if(e == 0){
1016
897
e = errno;
1017
898
}
1018
perror_plus("close");
899
perror("close");
1019
900
}
1020
901
gnutls_deinit(session);
1021
errno = e;
1022
902
if(quit_now){
1023
errno = EINTR;
903
e = EINTR;
1024
904
retval = -1;
1025
905
}
906
errno = e;
1026
907
}
1027
908
return retval;
1028
909
}
1040
921
AVAHI_GCC_UNUSED AvahiStringList *txt,
1041
922
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1042
923
flags,
1043
void* mc){
1044
if(r == NULL){
1045
return;
1046
}
924
AVAHI_GCC_UNUSED void* userdata){
925
assert(r);
1047
926
1048
927
/* Called whenever a service has been resolved successfully or
1049
928
timed out */
1055
934
switch(event){
1056
935
default:
1057
936
case AVAHI_RESOLVER_FAILURE:
1058
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1059
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1060
domain,
1061
avahi_strerror(avahi_server_errno
1062
(((mandos_context*)mc)->server)));
937
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
938
" of type '%s' in domain '%s': %s\n", name, type, domain,
939
avahi_strerror(avahi_server_errno(mc.server)));
1063
940
break;
1064
941
1065
942
case AVAHI_RESOLVER_FOUND:
1067
944
char ip[AVAHI_ADDRESS_STR_MAX];
1068
945
avahi_address_snprint(ip, sizeof(ip), address);
1069
946
if(debug){
1070
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1071
PRIdMAX ") on port %" PRIu16 "\n", name,
1072
host_name, ip, (intmax_t)interface, port);
947
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
948
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
949
ip, (intmax_t)interface, port);
1073
950
}
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1075
interface,
1076
avahi_proto_to_af(proto),
1077
mc);
951
int ret = start_mandos_communication(ip, port, interface,
952
avahi_proto_to_af(proto));
1078
953
if(ret == 0){
1079
avahi_simple_poll_quit(simple_poll);
1080
} else {
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1084
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1085
" list\n", name);
1086
}
954
avahi_simple_poll_quit(mc.simple_poll);
1087
955
}
1088
956
}
1089
957
}
1099
967
const char *domain,
1100
968
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1101
969
flags,
1102
void* mc){
1103
if(b == NULL){
1104
return;
1105
}
970
AVAHI_GCC_UNUSED void* userdata){
971
assert(b);
1106
972
1107
973
/* Called whenever a new services becomes available on the LAN or
1108
974
is removed from the LAN */
1115
981
default:
1116
982
case AVAHI_BROWSER_FAILURE:
1117
983
1118
fprintf_plus(stderr, "(Avahi browser) %s\n",
1119
avahi_strerror(avahi_server_errno
1120
(((mandos_context*)mc)->server)));
1121
avahi_simple_poll_quit(simple_poll);
984
fprintf(stderr, "(Avahi browser) %s\n",
985
avahi_strerror(avahi_server_errno(mc.server)));
986
avahi_simple_poll_quit(mc.simple_poll);
1122
987
return;
1123
988
1124
989
case AVAHI_BROWSER_NEW:
1127
992
the callback function is called the Avahi server will free the
1128
993
resolver for us. */
1129
994
1130
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1131
interface, protocol, name, type,
1132
domain, protocol, 0,
1133
resolve_callback, mc) == NULL)
1134
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1135
" %s\n", name,
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
995
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
996
name, type, domain, protocol, 0,
997
resolve_callback, NULL) == NULL)
998
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
999
name, avahi_strerror(avahi_server_errno(mc.server)));
1138
1000
break;
1139
1001
1140
1002
case AVAHI_BROWSER_REMOVE:
1143
1005
case AVAHI_BROWSER_ALL_FOR_NOW:
1144
1006
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1145
1007
if(debug){
1146
fprintf_plus(stderr, "No Mandos server found, still"
1147
" searching...\n");
1008
fprintf(stderr, "No Mandos server found, still searching...\n");
1148
1009
}
1149
1010
break;
1150
1011
}
1151
1012
}
1152
1013
1153
/* Signal handler that stops main loop after SIGTERM */
1014
/* stop main loop after sigterm has been called */
1154
1015
static void handle_sigterm(int sig){
1155
1016
if(quit_now){
1156
1017
return;
1158
1019
quit_now = 1;
1159
1020
signal_received = sig;
1160
1021
int old_errno = errno;
1161
/* set main loop to exit */
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1022
if(mc.simple_poll != NULL){
1023
avahi_simple_poll_quit(mc.simple_poll);
1164
1024
}
1165
1025
errno = old_errno;
1166
1026
}
1167
1027
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1169
int ret;
1170
error_t ret_errno;
1171
1172
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1173
if(s < 0){
1174
ret_errno = errno;
1175
perror_plus("socket");
1176
errno = ret_errno;
1177
return false;
1178
}
1179
strcpy(ifr->ifr_name, ifname);
1180
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1181
if(ret == -1){
1028
/*
1029
* This function determines if a directory entry in /sys/class/net
1030
* corresponds to an acceptable network device.
1031
* (This function is passed to scandir(3) as a filter function.)
1032
*/
1033
int good_interface(const struct dirent *if_entry){
1034
ssize_t ssret;
1035
char *flagname = NULL;
1036
if(if_entry->d_name[0] == '.'){
1037
return 0;
1038
}
1039
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1040
if_entry->d_name);
1041
if(ret < 0){
1042
perror("asprintf");
1043
return 0;
1044
}
1045
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1046
if(flags_fd == -1){
1047
perror("open");
1048
free(flagname);
1049
return 0;
1050
}
1051
free(flagname);
1052
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1053
/* read line from flags_fd */
1054
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1055
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1056
flagstring[(size_t)to_read] = '\0';
1057
if(flagstring == NULL){
1058
perror("malloc");
1059
close(flags_fd);
1060
return 0;
1061
}
1062
while(to_read > 0){
1063
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1064
(size_t)to_read));
1065
if(ssret == -1){
1066
perror("read");
1067
free(flagstring);
1068
close(flags_fd);
1069
return 0;
1070
}
1071
to_read -= ssret;
1072
if(ssret == 0){
1073
break;
1074
}
1075
}
1076
close(flags_fd);
1077
intmax_t tmpmax;
1078
char *tmp;
1079
errno = 0;
1080
tmpmax = strtoimax(flagstring, &tmp, 0);
1081
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1082
and not (isspace(*tmp)))
1083
or tmpmax != (ifreq_flags)tmpmax){
1182
1084
if(debug){
1183
ret_errno = errno;
1184
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1085
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1086
flagstring, if_entry->d_name);
1186
1087
}
1187
return false;
1088
free(flagstring);
1089
return 0;
1188
1090
}
1189
return true;
1190
}
1191
1192
bool good_flags(const char *ifname, const struct ifreq *ifr){
1193
1091
free(flagstring);
1092
ifreq_flags flags = (ifreq_flags)tmpmax;
1194
1093
/* Reject the loopback device */
1195
if(ifr->ifr_flags & IFF_LOOPBACK){
1094
if(flags & IFF_LOOPBACK){
1196
1095
if(debug){
1197
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1198
ifname);
1096
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1097
if_entry->d_name);
1199
1098
}
1200
return false;
1099
return 0;
1201
1100
}
1202
1101
/* Accept point-to-point devices only if connect_to is specified */
1203
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1102
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1204
1103
if(debug){
1205
fprintf_plus(stderr, "Accepting point-to-point interface"
1206
" \"%s\"\n", ifname);
1104
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1105
if_entry->d_name);
1207
1106
}
1208
return true;
1107
return 1;
1209
1108
}
1210
1109
/* Otherwise, reject non-broadcast-capable devices */
1211
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1110
if(not (flags & IFF_BROADCAST)){
1212
1111
if(debug){
1213
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1214
" \"%s\"\n", ifname);
1112
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1113
if_entry->d_name);
1215
1114
}
1216
return false;
1115
return 0;
1217
1116
}
1218
1117
/* Reject non-ARP interfaces (including dummy interfaces) */
1219
if(ifr->ifr_flags & IFF_NOARP){
1118
if(flags & IFF_NOARP){
1220
1119
if(debug){
1221
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1222
ifname);
1120
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1121
if_entry->d_name);
1223
1122
}
1224
return false;
1123
return 0;
1225
1124
}
1226
1227
1125
/* Accept this device */
1228
1126
if(debug){
1229
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1230
}
1231
return true;
1232
}
1233
1234
/*
1235
* This function determines if a directory entry in /sys/class/net
1236
* corresponds to an acceptable network device.
1237
* (This function is passed to scandir(3) as a filter function.)
1238
*/
1239
int good_interface(const struct dirent *if_entry){
1240
if(if_entry->d_name[0] == '.'){
1241
return 0;
1242
}
1243
1244
struct ifreq ifr;
1245
if(not get_flags(if_entry->d_name, &ifr)){
1246
if(debug){
1247
fprintf_plus(stderr, "Failed to get flags for interface "
1248
"\"%s\"\n", if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
if(not good_flags(if_entry->d_name, &ifr)){
1254
return 0;
1127
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1128
if_entry->d_name);
1255
1129
}
1256
1130
return 1;
1257
1131
}
1258
1132
1259
/*
1260
* This function determines if a network interface is up.
1261
*/
1262
bool interface_is_up(const char *interface){
1263
struct ifreq ifr;
1264
if(not get_flags(interface, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", interface);
1268
}
1269
return false;
1270
}
1271
1272
return (bool)(ifr.ifr_flags & IFF_UP);
1273
}
1274
1275
/*
1276
* This function determines if a network interface is running
1277
*/
1278
bool interface_is_running(const char *interface){
1279
struct ifreq ifr;
1280
if(not get_flags(interface, &ifr)){
1281
if(debug){
1282
fprintf_plus(stderr, "Failed to get flags for interface "
1283
"\"%s\"\n", interface);
1284
}
1285
return false;
1286
}
1287
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1289
}
1290
1291
1133
int notdotentries(const struct dirent *direntry){
1292
1134
/* Skip "." and ".." */
1293
1135
if(direntry->d_name[0] == '.'
1299
1141
return 1;
1300
1142
}
1301
1143
1302
/* Is this directory entry a runnable program? */
1303
int runnable_hook(const struct dirent *direntry){
1304
int ret;
1305
size_t sret;
1306
struct stat st;
1307
1308
if((direntry->d_name)[0] == '\0'){
1309
/* Empty name? */
1310
return 0;
1311
}
1312
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1314
"abcdefghijklmnopqrstuvwxyz"
1315
"0123456789"
1316
"_-");
1317
if((direntry->d_name)[sret] != '\0'){
1318
/* Contains non-allowed characters */
1319
if(debug){
1320
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1321
direntry->d_name);
1322
}
1323
return 0;
1324
}
1325
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1328
if(ret < 0){
1329
perror_plus("asprintf");
1330
return 0;
1331
}
1332
1333
ret = stat(fullname, &st);
1334
if(ret == -1){
1335
if(debug){
1336
perror_plus("Could not stat hook");
1337
}
1338
return 0;
1339
}
1340
if(not (S_ISREG(st.st_mode))){
1341
/* Not a regular file */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1349
/* Not executable */
1350
if(debug){
1351
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1352
direntry->d_name);
1353
}
1354
return 0;
1355
}
1356
if(debug){
1357
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1358
direntry->d_name);
1359
}
1360
return 1;
1361
}
1362
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1365
int ret;
1366
struct timespec now;
1367
struct timespec waited_time;
1368
intmax_t block_time;
1369
1370
while(true){
1371
if(mc->current_server == NULL){
1372
if (debug){
1373
fprintf_plus(stderr, "Wait until first server is found."
1374
" No timeout!\n");
1375
}
1376
ret = avahi_simple_poll_iterate(s, -1);
1377
} else {
1378
if (debug){
1379
fprintf_plus(stderr, "Check current_server if we should run"
1380
" it, or wait\n");
1381
}
1382
/* the current time */
1383
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1384
if(ret == -1){
1385
perror_plus("clock_gettime");
1386
return -1;
1387
}
1388
/* Calculating in ms how long time between now and server
1389
who we visted longest time ago. Now - last seen. */
1390
waited_time.tv_sec = (now.tv_sec
1391
- mc->current_server->last_seen.tv_sec);
1392
waited_time.tv_nsec = (now.tv_nsec
1393
- mc->current_server->last_seen.tv_nsec);
1394
/* total time is 10s/10,000ms.
1395
Converting to s from ms by dividing by 1,000,
1396
and ns to ms by dividing by 1,000,000. */
1397
block_time = ((retry_interval
1398
- ((intmax_t)waited_time.tv_sec * 1000))
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
1400
1401
if (debug){
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1403
block_time);
1404
}
1405
1406
if(block_time <= 0){
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
mc->current_server->af, mc);
1411
if(ret == 0){
1412
avahi_simple_poll_quit(s);
1413
return 0;
1414
}
1415
ret = clock_gettime(CLOCK_MONOTONIC,
1416
&mc->current_server->last_seen);
1417
if(ret == -1){
1418
perror_plus("clock_gettime");
1419
return -1;
1420
}
1421
mc->current_server = mc->current_server->next;
1422
block_time = 0; /* Call avahi to find new Mandos
1423
servers, but don't block */
1424
}
1425
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
1427
}
1428
if(ret != 0){
1429
if (ret > 0 or errno != EINTR){
1430
return (ret != 1) ? ret : 0;
1431
}
1432
}
1433
}
1434
}
1435
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
1489
const float delay){
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
1495
if(numhooks == -1){
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
1503
}
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
1511
perror_plus("asprintf");
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
free(delaystring);
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
1582
} else {
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
1619
}
1620
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1627
struct ifreq network;
1628
unsigned int if_index = if_nametoindex(interface);
1629
if(if_index == 0){
1630
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1631
errno = old_errno;
1632
return ENXIO;
1633
}
1634
1635
if(quit_now){
1636
errno = old_errno;
1637
return EINTR;
1638
}
1639
1640
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
1642
ret_errno = errno;
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1644
"\"%s\"\n", interface);
1645
return ret_errno;
1646
}
1647
network.ifr_flags |= IFF_UP;
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
ret_errno = errno;
1652
perror_plus("socket");
1653
errno = old_errno;
1654
return ret_errno;
1655
}
1656
1657
if(quit_now){
1658
close(sd);
1659
errno = old_errno;
1660
return EINTR;
1661
}
1662
1663
if(debug){
1664
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1665
interface);
1666
}
1667
1668
/* Raise priviliges */
1669
raise_privileges();
1670
1671
#ifdef __linux__
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
1679
}
1680
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1683
#ifdef __linux__
1684
if(restore_loglevel){
1685
ret_linux = klogctl(7, NULL, 0);
1686
if(ret_linux == -1){
1687
perror_plus("klogctl");
1688
}
1689
}
1690
#endif /* __linux__ */
1691
1692
/* Lower privileges */
1693
lower_privileges();
1694
1695
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1697
if(ret == -1){
1698
perror_plus("close");
1699
}
1700
1701
if(ret_setflags == -1){
1702
errno = ret_errno;
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
} else if(debug){
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1709
interface);
1710
}
1711
1712
/* Sleep checking until interface is running.
1713
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
1715
if(interface_is_running(interface)){
1716
break;
1717
}
1718
struct timespec sleeptime = { .tv_nsec = 250000000 };
1719
ret = nanosleep(&sleeptime, NULL);
1720
if(ret == -1 and errno != EINTR){
1721
perror_plus("nanosleep");
1722
}
1723
}
1724
1725
errno = old_errno;
1726
return 0;
1727
}
1728
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
if(not get_flags(interface, &network) and debug){
1743
ret_errno = errno;
1744
fprintf_plus(stderr, "Failed to get flags for interface "
1745
"\"%s\"\n", interface);
1746
return ret_errno;
1747
}
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1749
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
1752
ret_errno = errno;
1753
perror_plus("socket");
1754
errno = old_errno;
1755
return ret_errno;
1756
}
1757
1758
if(debug){
1759
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1760
interface);
1761
}
1762
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ret_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1781
errno = old_errno;
1782
return ret_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1786
interface);
1787
}
1788
1789
errno = old_errno;
1790
return 0;
1791
}
1792
1793
1144
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
1798
1145
AvahiSServiceBrowser *sb = NULL;
1799
error_t ret_errno;
1146
int error;
1800
1147
int ret;
1801
1148
intmax_t tmpmax;
1802
1149
char *tmp;
1803
1150
int exitcode = EXIT_SUCCESS;
1804
char *interfaces_to_take_down = NULL;
1805
size_t interfaces_to_take_down_size = 0;
1151
const char *interface = "";
1152
struct ifreq network;
1153
int sd = -1;
1154
bool take_down_interface = false;
1155
uid_t uid;
1156
gid_t gid;
1806
1157
char tempdir[] = "/tmp/mandosXXXXXX";
1807
1158
bool tempdir_created = false;
1808
1159
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1809
1160
const char *seckey = PATHDIR "/" SECKEY;
1810
1161
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
1813
1162
1814
1163
bool gnutls_initialized = false;
1815
1164
bool gpgme_initialized = false;
1816
1165
float delay = 2.5f;
1817
double retry_interval = 10; /* 10s between trying a server and
1818
retrying the same server again */
1819
1166
1820
1167
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1821
1168
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1827
1174
errno = 0;
1828
1175
ret = setgid(gid);
1829
1176
if(ret == -1){
1830
perror_plus("setgid");
1177
perror("setgid");
1831
1178
}
1832
1179
1833
1180
/* Lower user privileges (temporarily) */
1834
1181
errno = 0;
1835
1182
ret = seteuid(uid);
1836
1183
if(ret == -1){
1837
perror_plus("seteuid");
1184
perror("seteuid");
1838
1185
}
1839
1186
1840
1187
if(quit_now){
1875
1222
.arg = "SECONDS",
1876
1223
.doc = "Maximum delay to wait for interface startup",
1877
1224
.group = 2 },
1878
{ .name = "retry", .key = 132,
1879
.arg = "SECONDS",
1880
.doc = "Retry interval used when denied by the Mandos server",
1881
.group = 2 },
1882
{ .name = "network-hook-dir", .key = 133,
1883
.arg = "DIR",
1884
.doc = "Directory where network hooks are located",
1885
.group = 2 },
1886
1225
/*
1887
1226
* These reproduce what we would get without ARGP_NO_HELP
1888
1227
*/
1906
1245
connect_to = arg;
1907
1246
break;
1908
1247
case 'i': /* --interface */
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1248
interface = arg;
1914
1249
break;
1915
1250
case 's': /* --seckey */
1916
1251
seckey = arg;
1936
1271
if(errno != 0 or tmp == arg or *tmp != '\0'){
1937
1272
argp_error(state, "Bad delay");
1938
1273
}
1939
case 132: /* --retry */
1940
errno = 0;
1941
retry_interval = strtod(arg, &tmp);
1942
if(errno != 0 or tmp == arg or *tmp != '\0'
1943
or (retry_interval * 1000) > INT_MAX
1944
or retry_interval < 0){
1945
argp_error(state, "Bad retry interval");
1946
}
1947
break;
1948
case 133: /* --network-hook-dir */
1949
hookdir = arg;
1950
1274
break;
1951
1275
/*
1952
1276
* These reproduce what we would get without ARGP_NO_HELP
1959
1283
argp_state_help(state, state->out_stream,
1960
1284
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
1285
case 'V': /* --version */
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1286
fprintf(state->out_stream, "%s\n", argp_program_version);
1963
1287
exit(argp_err_exit_status);
1964
1288
break;
1965
1289
default:
1980
1304
case ENOMEM:
1981
1305
default:
1982
1306
errno = ret;
1983
perror_plus("argp_parse");
1307
perror("argp_parse");
1984
1308
exitcode = EX_OSERR;
1985
1309
goto end;
1986
1310
case EINVAL:
1988
1312
goto end;
1989
1313
}
1990
1314
}
1991
1992
{
1993
/* Work around Debian bug #633582:
1994
<http://bugs.debian.org/633582> */
1995
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
2061
}
2062
}
2063
2064
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
2081
}
2082
1315
2083
1316
if(not debug){
2084
1317
avahi_set_log_function(empty_log);
2085
1318
}
1319
1320
if(interface[0] == '\0'){
1321
struct dirent **direntries;
1322
ret = scandir(sys_class_net, &direntries, good_interface,
1323
alphasort);
1324
if(ret >= 1){
1325
/* Pick the first good interface */
1326
interface = strdup(direntries[0]->d_name);
1327
if(debug){
1328
fprintf(stderr, "Using interface \"%s\"\n", interface);
1329
}
1330
if(interface == NULL){
1331
perror("malloc");
1332
free(direntries);
1333
exitcode = EXIT_FAILURE;
1334
goto end;
1335
}
1336
free(direntries);
1337
} else {
1338
free(direntries);
1339
fprintf(stderr, "Could not find a network interface\n");
1340
exitcode = EXIT_FAILURE;
1341
goto end;
1342
}
1343
}
2086
1344
2087
1345
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2088
1346
from the signal handler */
2089
1347
/* Initialize the pseudo-RNG for Avahi */
2090
1348
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"Avahi: Failed to create simple poll object.\n");
1349
mc.simple_poll = avahi_simple_poll_new();
1350
if(mc.simple_poll == NULL){
1351
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2095
1352
exitcode = EX_UNAVAILABLE;
2096
1353
goto end;
2097
1354
}
2099
1356
sigemptyset(&sigterm_action.sa_mask);
2100
1357
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2101
1358
if(ret == -1){
2102
perror_plus("sigaddset");
1359
perror("sigaddset");
2103
1360
exitcode = EX_OSERR;
2104
1361
goto end;
2105
1362
}
2106
1363
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2107
1364
if(ret == -1){
2108
perror_plus("sigaddset");
1365
perror("sigaddset");
2109
1366
exitcode = EX_OSERR;
2110
1367
goto end;
2111
1368
}
2112
1369
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2113
1370
if(ret == -1){
2114
perror_plus("sigaddset");
1371
perror("sigaddset");
2115
1372
exitcode = EX_OSERR;
2116
1373
goto end;
2117
1374
}
2121
1378
*/
2122
1379
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2123
1380
if(ret == -1){
2124
perror_plus("sigaction");
1381
perror("sigaction");
2125
1382
return EX_OSERR;
2126
1383
}
2127
1384
if(old_sigterm_action.sa_handler != SIG_IGN){
2128
1385
ret = sigaction(SIGINT, &sigterm_action, NULL);
2129
1386
if(ret == -1){
2130
perror_plus("sigaction");
1387
perror("sigaction");
2131
1388
exitcode = EX_OSERR;
2132
1389
goto end;
2133
1390
}
2134
1391
}
2135
1392
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2136
1393
if(ret == -1){
2137
perror_plus("sigaction");
1394
perror("sigaction");
2138
1395
return EX_OSERR;
2139
1396
}
2140
1397
if(old_sigterm_action.sa_handler != SIG_IGN){
2141
1398
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2142
1399
if(ret == -1){
2143
perror_plus("sigaction");
1400
perror("sigaction");
2144
1401
exitcode = EX_OSERR;
2145
1402
goto end;
2146
1403
}
2147
1404
}
2148
1405
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2149
1406
if(ret == -1){
2150
perror_plus("sigaction");
1407
perror("sigaction");
2151
1408
return EX_OSERR;
2152
1409
}
2153
1410
if(old_sigterm_action.sa_handler != SIG_IGN){
2154
1411
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2155
1412
if(ret == -1){
2156
perror_plus("sigaction");
2157
exitcode = EX_OSERR;
2158
goto end;
2159
}
2160
}
2161
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
perror_plus("argz_add");
2175
continue;
2176
}
2177
if(debug){
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
direntries[i]->d_name);
2180
}
2181
}
2182
free(direntries);
2183
} else {
2184
free(direntries);
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2186
exitcode = EXIT_FAILURE;
2187
goto end;
2188
}
2189
}
2190
2191
/* Bring up interfaces which are down, and remove any "none"s */
2192
{
2193
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2195
interface))){
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2200
interface);
2201
interface = NULL;
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
2206
interface);
2207
interface = NULL;
1413
perror("sigaction");
1414
exitcode = EX_OSERR;
1415
goto end;
1416
}
1417
}
1418
1419
/* If the interface is down, bring it up */
1420
if(strcmp(interface, "none") != 0){
1421
if_index = (AvahiIfIndex) if_nametoindex(interface);
1422
if(if_index == 0){
1423
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1424
exitcode = EX_UNAVAILABLE;
1425
goto end;
1426
}
1427
1428
if(quit_now){
1429
goto end;
1430
}
1431
1432
/* Re-raise priviliges */
1433
errno = 0;
1434
ret = seteuid(0);
1435
if(ret == -1){
1436
perror("seteuid");
1437
}
1438
1439
#ifdef __linux__
1440
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1441
messages about the network interface to mess up the prompt */
1442
ret = klogctl(8, NULL, 5);
1443
bool restore_loglevel = true;
1444
if(ret == -1){
1445
restore_loglevel = false;
1446
perror("klogctl");
1447
}
1448
#endif /* __linux__ */
1449
1450
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1451
if(sd < 0){
1452
perror("socket");
1453
exitcode = EX_OSERR;
1454
#ifdef __linux__
1455
if(restore_loglevel){
1456
ret = klogctl(7, NULL, 0);
1457
if(ret == -1){
1458
perror("klogctl");
1459
}
1460
}
1461
#endif /* __linux__ */
1462
/* Lower privileges */
1463
errno = 0;
1464
ret = seteuid(uid);
1465
if(ret == -1){
1466
perror("seteuid");
1467
}
1468
goto end;
1469
}
1470
strcpy(network.ifr_name, interface);
1471
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1472
if(ret == -1){
1473
perror("ioctl SIOCGIFFLAGS");
1474
#ifdef __linux__
1475
if(restore_loglevel){
1476
ret = klogctl(7, NULL, 0);
1477
if(ret == -1){
1478
perror("klogctl");
1479
}
1480
}
1481
#endif /* __linux__ */
1482
exitcode = EX_OSERR;
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1489
goto end;
1490
}
1491
if((network.ifr_flags & IFF_UP) == 0){
1492
network.ifr_flags |= IFF_UP;
1493
take_down_interface = true;
1494
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1495
if(ret == -1){
1496
take_down_interface = false;
1497
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1498
exitcode = EX_OSERR;
1499
#ifdef __linux__
1500
if(restore_loglevel){
1501
ret = klogctl(7, NULL, 0);
1502
if(ret == -1){
1503
perror("klogctl");
2208
1504
}
2209
1505
}
1506
#endif /* __linux__ */
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror("seteuid");
1512
}
1513
goto end;
1514
}
1515
}
1516
/* sleep checking until interface is running */
1517
for(int i=0; i < delay * 4; i++){
1518
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1519
if(ret == -1){
1520
perror("ioctl SIOCGIFFLAGS");
1521
} else if(network.ifr_flags & IFF_RUNNING){
2210
1522
break;
2211
1523
}
2212
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
2214
if(not interface_was_up){
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2218
} else {
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2222
}
2223
}
2224
}
2225
if(debug and (interfaces_to_take_down == NULL)){
2226
fprintf_plus(stderr, "No interfaces were brought up\n");
2227
}
2228
}
2229
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2232
if(debug){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2234
mc.interfaces);
2235
}
2236
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1524
struct timespec sleeptime = { .tv_nsec = 250000000 };
1525
ret = nanosleep(&sleeptime, NULL);
1526
if(ret == -1 and errno != EINTR){
1527
perror("nanosleep");
1528
}
1529
}
1530
if(not take_down_interface){
1531
/* We won't need the socket anymore */
1532
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1533
if(ret == -1){
1534
perror("close");
1535
}
1536
}
1537
#ifdef __linux__
1538
if(restore_loglevel){
1539
/* Restores kernel loglevel to default */
1540
ret = klogctl(7, NULL, 0);
1541
if(ret == -1){
1542
perror("klogctl");
1543
}
1544
}
1545
#endif /* __linux__ */
1546
/* Lower privileges */
1547
errno = 0;
1548
if(take_down_interface){
1549
/* Lower privileges */
1550
ret = seteuid(uid);
1551
if(ret == -1){
1552
perror("seteuid");
1553
}
1554
} else {
1555
/* Lower privileges permanently */
1556
ret = setuid(uid);
1557
if(ret == -1){
1558
perror("setuid");
1559
}
1560
}
2237
1561
}
2238
1562
2239
1563
if(quit_now){
2240
1564
goto end;
2241
1565
}
2242
1566
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
1567
ret = init_gnutls_global(pubkey, seckey);
2244
1568
if(ret == -1){
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
1569
fprintf(stderr, "init_gnutls_global failed\n");
2246
1570
exitcode = EX_UNAVAILABLE;
2247
1571
goto end;
2248
1572
} else {
2254
1578
}
2255
1579
2256
1580
if(mkdtemp(tempdir) == NULL){
2257
perror_plus("mkdtemp");
1581
perror("mkdtemp");
2258
1582
goto end;
2259
1583
}
2260
1584
tempdir_created = true;
2263
1587
goto end;
2264
1588
}
2265
1589
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2267
fprintf_plus(stderr, "init_gpgme failed\n");
1590
if(not init_gpgme(pubkey, seckey, tempdir)){
1591
fprintf(stderr, "init_gpgme failed\n");
2268
1592
exitcode = EX_UNAVAILABLE;
2269
1593
goto end;
2270
1594
} else {
2279
1603
/* Connect directly, do not use Zeroconf */
2280
1604
/* (Mainly meant for debugging) */
2281
1605
char *address = strrchr(connect_to, ':');
2282
2283
1606
if(address == NULL){
2284
fprintf_plus(stderr, "No colon in address\n");
1607
fprintf(stderr, "No colon in address\n");
2285
1608
exitcode = EX_USAGE;
2286
1609
goto end;
2287
1610
}
2290
1613
goto end;
2291
1614
}
2292
1615
2293
in_port_t port;
1616
uint16_t port;
2294
1617
errno = 0;
2295
1618
tmpmax = strtoimax(address+1, &tmp, 10);
2296
1619
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2297
or tmpmax != (in_port_t)tmpmax){
2298
fprintf_plus(stderr, "Bad port number\n");
1620
or tmpmax != (uint16_t)tmpmax){
1621
fprintf(stderr, "Bad port number\n");
2299
1622
exitcode = EX_USAGE;
2300
1623
goto end;
2301
1624
}
2302
1625
2303
1626
if(quit_now){
2304
1627
goto end;
2305
1628
}
2306
1629
2307
port = (in_port_t)tmpmax;
1630
port = (uint16_t)tmpmax;
2308
1631
*address = '\0';
1632
address = connect_to;
2309
1633
/* Colon in address indicates IPv6 */
2310
1634
int af;
2311
if(strchr(connect_to, ':') != NULL){
1635
if(strchr(address, ':') != NULL){
2312
1636
af = AF_INET6;
2313
/* Accept [] around IPv6 address - see RFC 5952 */
2314
if(connect_to[0] == '[' and address[-1] == ']')
2315
{
2316
connect_to++;
2317
address[-1] = '\0';
2318
}
2319
1637
} else {
2320
1638
af = AF_INET;
2321
1639
}
2322
address = connect_to;
2323
1640
2324
1641
if(quit_now){
2325
1642
goto end;
2326
1643
}
2327
1644
2328
1645
while(not quit_now){
2329
ret = start_mandos_communication(address, port, if_index, af,
2330
&mc);
1646
ret = start_mandos_communication(address, port, if_index, af);
2331
1647
if(quit_now or ret == 0){
2332
1648
break;
2333
1649
}
2334
if(debug){
2335
fprintf_plus(stderr, "Retrying in %d seconds\n",
2336
(int)retry_interval);
2337
}
2338
sleep((unsigned int)retry_interval);
2339
}
2340
1650
sleep(15);
1651
};
1652
2341
1653
if (not quit_now){
2342
1654
exitcode = EXIT_SUCCESS;
2343
1655
}
2344
1656
2345
1657
goto end;
2346
1658
}
2347
1659
2359
1671
config.publish_domain = 0;
2360
1672
2361
1673
/* Allocate a new server */
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
1674
mc.server = avahi_server_new(avahi_simple_poll_get
1675
(mc.simple_poll), &config, NULL,
1676
NULL, &error);
2364
1677
2365
1678
/* Free the Avahi configuration data */
2366
1679
avahi_server_config_free(&config);
2368
1681
2369
1682
/* Check if creating the Avahi server object succeeded */
2370
1683
if(mc.server == NULL){
2371
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2372
avahi_strerror(ret_errno));
1684
fprintf(stderr, "Failed to create Avahi server: %s\n",
1685
avahi_strerror(error));
2373
1686
exitcode = EX_UNAVAILABLE;
2374
1687
goto end;
2375
1688
}
2381
1694
/* Create the Avahi service browser */
2382
1695
sb = avahi_s_service_browser_new(mc.server, if_index,
2383
1696
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2384
NULL, 0, browse_callback,
2385
(void *)&mc);
1697
NULL, 0, browse_callback, NULL);
2386
1698
if(sb == NULL){
2387
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2388
avahi_strerror(avahi_server_errno(mc.server)));
1699
fprintf(stderr, "Failed to create service browser: %s\n",
1700
avahi_strerror(avahi_server_errno(mc.server)));
2389
1701
exitcode = EX_UNAVAILABLE;
2390
1702
goto end;
2391
1703
}
2397
1709
/* Run the main loop */
2398
1710
2399
1711
if(debug){
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
2401
}
2402
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
2405
if(debug){
2406
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2407
(ret == 0) ? "successfully" : "with error");
2408
}
1712
fprintf(stderr, "Starting Avahi loop search\n");
1713
}
1714
1715
avahi_simple_poll_loop(mc.simple_poll);
2409
1716
2410
1717
end:
2411
1718
2412
1719
if(debug){
2413
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1720
fprintf(stderr, "%s exiting\n", argv[0]);
2414
1721
}
2415
1722
2416
1723
/* Cleanup things */
2417
free(mc.interfaces);
2418
2419
1724
if(sb != NULL)
2420
1725
avahi_s_service_browser_free(sb);
2421
1726
2422
1727
if(mc.server != NULL)
2423
1728
avahi_server_free(mc.server);
2424
1729
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
1730
if(mc.simple_poll != NULL)
1731
avahi_simple_poll_free(mc.simple_poll);
2427
1732
2428
1733
if(gnutls_initialized){
2429
1734
gnutls_certificate_free_credentials(mc.cred);
2435
1740
gpgme_release(mc.ctx);
2436
1741
}
2437
1742
2438
/* Cleans up the circular linked list of Mandos servers the client
2439
has seen */
2440
if(mc.current_server != NULL){
2441
mc.current_server->prev->next = NULL;
2442
while(mc.current_server != NULL){
2443
server *next = mc.current_server->next;
2444
free(mc.current_server);
2445
mc.current_server = next;
1743
/* Take down the network interface */
1744
if(take_down_interface){
1745
/* Re-raise priviliges */
1746
errno = 0;
1747
ret = seteuid(0);
1748
if(ret == -1){
1749
perror("seteuid");
2446
1750
}
2447
}
2448
2449
/* Re-raise priviliges */
2450
{
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
1751
if(geteuid() == 0){
1752
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1753
if(ret == -1){
1754
perror("ioctl SIOCGIFFLAGS");
1755
} else if(network.ifr_flags & IFF_UP) {
1756
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1757
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1758
if(ret == -1){
1759
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2467
1760
}
2468
1761
}
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
1762
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1763
if(ret == -1){
1764
perror("close");
1765
}
1766
/* Lower privileges permanently */
1767
errno = 0;
1768
ret = setuid(uid);
1769
if(ret == -1){
1770
perror("setuid");
2472
1771
}
2473
1772
}
2474
2475
lower_privileges_permanently();
2476
1773
}
2477
1774
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2480
2481
1775
/* Removes the GPGME temp directory and all files inside */
2482
1776
if(tempdir_created){
2483
1777
struct dirent **direntries = NULL;
2484
1778
struct dirent *direntry = NULL;
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2486
alphasort);
2487
if (numentries > 0){
2488
for(int i = 0; i < numentries; i++){
1779
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1780
if (ret > 0){
1781
for(int i = 0; i < ret; i++){
2489
1782
direntry = direntries[i];
2490
1783
char *fullname = NULL;
2491
1784
ret = asprintf(&fullname, "%s/%s", tempdir,
2492
1785
direntry->d_name);
2493
1786
if(ret < 0){
2494
perror_plus("asprintf");
1787
perror("asprintf");
2495
1788
continue;
2496
1789
}
2497
1790
ret = remove(fullname);
2498
1791
if(ret == -1){
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
1792
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1793
strerror(errno));
2501
1794
}
2502
1795
free(fullname);
2503
1796
}
2504
1797
}
2505
1798
2506
/* need to clean even if 0 because man page doesn't specify */
1799
/* need to be cleaned even if ret == 0 because man page dont specify */
2507
1800
free(direntries);
2508
if (numentries == -1){
2509
perror_plus("scandir");
1801
if (ret == -1){
1802
perror("scandir");
2510
1803
}
2511
1804
ret = rmdir(tempdir);
2512
1805
if(ret == -1 and errno != ENOENT){
2513
perror_plus("rmdir");
1806
perror("rmdir");
2514
1807
}
2515
1808
}
2516
1809
2521
1814
&old_sigterm_action,
2522
1815
NULL));
2523
1816
if(ret == -1){
2524
perror_plus("sigaction");
1817
perror("sigaction");
2525
1818
}
2526
1819
do {
2527
1820
ret = raise(signal_received);
2528
1821
} while(ret != 0 and errno == EINTR);
2529
1822
if(ret != 0){
2530
perror_plus("raise");
1823
perror("raise");
2531
1824
abort();
2532
1825
}
2533
1826
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0