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- Committer: Teddy Hogeborn
- Date: 2012-06-16 23:25:46 UTC
- Revision ID: teddy@recompile.se-20120616232546-dcrkmnhd4yhq6mvd
* plugins.d/mandos-client (mandos_context): Moved to inside "main()".
All users changed.
(add_server): Take new "current_server" argument; all callers
changed.
(init_gpgme, pgp_packet_decrypt, init_gnutls_global,
init_gnutls_session, start_mandos_communication,
avahi_loop_with_timeout): Take new "mc" argument"; all callers
changed.
(resolve_callback, browse_callback): Handle void pointer userdata as
"mc", a pointer to
mandos_context. All callers
changed.
(main): New "mc" variable.
All users changed.
(add_server): Take new "current_server" argument; all callers
changed.
(init_gpgme, pgp_packet_decrypt, init_gnutls_global,
init_gnutls_session, start_mandos_communication,
avahi_loop_with_timeout): Take new "mc" argument"; all callers
changed.
(resolve_callback, browse_callback): Handle void pointer userdata as
"mc", a pointer to
mandos_context. All callers
changed.
(main): New "mc" variable.
- 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 © 2008-2010 Teddy Hogeborn
13
* Copyright © 2008-2010 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;
142
164
} mandos_context;
143
165
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" };
166
/* global so signal handler can reach it*/
167
AvahiSimplePoll *simple_poll;
148
168
149
169
sig_atomic_t quit_now = 0;
150
170
int signal_received = 0;
151
171
172
/* Function to use when printing errors */
173
void perror_plus(const char *print_text){
174
int e = errno;
175
fprintf(stderr, "Mandos plugin %s: ",
176
program_invocation_short_name);
177
errno = e;
178
perror(print_text);
179
}
180
181
__attribute__((format (gnu_printf, 2, 3)))
182
int fprintf_plus(FILE *stream, const char *format, ...){
183
va_list ap;
184
va_start (ap, format);
185
186
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
187
program_invocation_short_name));
188
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
189
}
190
152
191
/*
153
192
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
193
* bytes. "buffer_capacity" is how much is currently allocated,
155
194
* "buffer_length" is how much is already used.
156
195
*/
157
196
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
197
size_t buffer_capacity){
159
198
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
199
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
200
if(buffer == NULL){
166
205
return buffer_capacity;
167
206
}
168
207
208
/* Add server to set of servers to retry periodically */
209
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
210
int af, server **current_server){
211
int ret;
212
server *new_server = malloc(sizeof(server));
213
if(new_server == NULL){
214
perror_plus("malloc");
215
return false;
216
}
217
*new_server = (server){ .ip = strdup(ip),
218
.port = port,
219
.if_index = if_index,
220
.af = af };
221
if(new_server->ip == NULL){
222
perror_plus("strdup");
223
return false;
224
}
225
/* Special case of first server */
226
if(*current_server == NULL){
227
new_server->next = new_server;
228
new_server->prev = new_server;
229
*current_server = new_server;
230
/* Place the new server last in the list */
231
} else {
232
new_server->next = *current_server;
233
new_server->prev = (*current_server)->prev;
234
new_server->prev->next = new_server;
235
(*current_server)->prev = new_server;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
return true;
243
}
244
169
245
/*
170
246
* Initialize GPGME.
171
247
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
174
250
gpgme_error_t rc;
175
251
gpgme_engine_info_t engine_info;
176
252
177
178
253
/*
179
254
* Helper function to insert pub and seckey to the engine keyring.
180
255
*/
185
260
186
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
262
if(fd == -1){
188
perror("open");
263
perror_plus("open");
189
264
return false;
190
265
}
191
266
192
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
268
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));
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
196
271
return false;
197
272
}
198
273
199
rc = gpgme_op_import(mc.ctx, pgp_data);
274
rc = gpgme_op_import(mc->ctx, pgp_data);
200
275
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
203
278
return false;
204
279
}
205
280
206
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
282
if(ret == -1){
208
perror("close");
283
perror_plus("close");
209
284
}
210
285
gpgme_data_release(pgp_data);
211
286
return true;
212
287
}
213
288
214
289
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
216
291
}
217
292
218
293
/* Init GPGME */
219
294
gpgme_check_version(NULL);
220
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
296
if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
224
299
return false;
225
300
}
226
301
227
/* Set GPGME home directory for the OpenPGP engine only */
302
/* Set GPGME home directory for the OpenPGP engine only */
228
303
rc = gpgme_get_engine_info(&engine_info);
229
304
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
232
307
return false;
233
308
}
234
309
while(engine_info != NULL){
240
315
engine_info = engine_info->next;
241
316
}
242
317
if(engine_info == NULL){
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
244
320
return false;
245
321
}
246
322
247
323
/* Create new GPGME "context" */
248
rc = gpgme_new(&(mc.ctx));
324
rc = gpgme_new(&(mc->ctx));
249
325
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
252
329
return false;
253
330
}
254
331
265
342
*/
266
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
344
size_t crypto_size,
268
char **plaintext){
345
char **plaintext,
346
mandos_context *mc){
269
347
gpgme_data_t dh_crypto, dh_plain;
270
348
gpgme_error_t rc;
271
349
ssize_t ret;
273
351
ssize_t plaintext_length = 0;
274
352
275
353
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
354
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
277
355
}
278
356
279
357
/* Create new GPGME data buffer from memory cryptotext */
280
358
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
359
0);
282
360
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));
361
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
285
363
return -1;
286
364
}
287
365
288
366
/* Create new empty GPGME data buffer for the plaintext */
289
367
rc = gpgme_data_new(&dh_plain);
290
368
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
369
fprintf_plus(stderr, "Mandos plugin mandos-client: "
370
"bad gpgme_data_new: %s: %s\n",
371
gpgme_strsource(rc), gpgme_strerror(rc));
293
372
gpgme_data_release(dh_crypto);
294
373
return -1;
295
374
}
296
375
297
376
/* Decrypt data from the cryptotext data buffer to the plaintext
298
377
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
300
379
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
380
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
303
382
plaintext_length = -1;
304
383
if(debug){
305
384
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
385
result = gpgme_op_decrypt_result(mc->ctx);
307
386
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
387
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
309
388
} 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);
389
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
390
result->unsupported_algorithm);
391
fprintf_plus(stderr, "Wrong key usage: %u\n",
392
result->wrong_key_usage);
314
393
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
394
fprintf_plus(stderr, "File name: %s\n", result->file_name);
316
395
}
317
396
gpgme_recipient_t recipient;
318
397
recipient = result->recipients;
319
398
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");
399
fprintf_plus(stderr, "Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name
401
(recipient->pubkey_algo));
402
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
403
fprintf_plus(stderr, "Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
326
406
recipient = recipient->next;
327
407
}
328
408
}
331
411
}
332
412
333
413
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
335
415
}
336
416
337
417
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
418
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
419
perror_plus("gpgme_data_seek");
340
420
plaintext_length = -1;
341
421
goto decrypt_end;
342
422
}
344
424
*plaintext = NULL;
345
425
while(true){
346
426
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
427
(size_t)plaintext_length,
428
plaintext_capacity);
349
429
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
430
perror_plus("incbuffer");
431
plaintext_length = -1;
432
goto decrypt_end;
353
433
}
354
434
355
435
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
360
440
break;
361
441
}
362
442
if(ret < 0){
363
perror("gpgme_data_read");
443
perror_plus("gpgme_data_read");
364
444
plaintext_length = -1;
365
445
goto decrypt_end;
366
446
}
368
448
}
369
449
370
450
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
451
fprintf_plus(stderr, "Decrypted password is: ");
372
452
for(ssize_t i = 0; i < plaintext_length; i++){
373
453
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
454
}
386
466
}
387
467
388
468
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
469
const char *ret = gnutls_strerror(value);
391
470
if(ret == NULL)
392
471
ret = "(unknown)";
393
472
return ret;
396
475
/* GnuTLS log function callback */
397
476
static void debuggnutls(__attribute__((unused)) int level,
398
477
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
478
fprintf_plus(stderr, "GnuTLS: %s", string);
400
479
}
401
480
402
481
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
482
const char *seckeyfilename,
483
mandos_context *mc){
404
484
int ret;
405
485
406
486
if(debug){
407
fprintf(stderr, "Initializing GnuTLS\n");
487
fprintf_plus(stderr, "Initializing GnuTLS\n");
408
488
}
409
489
410
490
ret = gnutls_global_init();
411
491
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
492
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
493
safer_gnutls_strerror(ret));
414
494
return -1;
415
495
}
416
496
423
503
}
424
504
425
505
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
506
ret = gnutls_certificate_allocate_credentials(&mc->cred);
427
507
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));
508
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
509
safer_gnutls_strerror(ret));
433
510
gnutls_global_deinit();
434
511
return -1;
435
512
}
436
513
437
514
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
515
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
516
" secret key %s as GnuTLS credentials\n",
517
pubkeyfilename,
518
seckeyfilename);
441
519
}
442
520
443
521
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
522
(mc->cred, pubkeyfilename, seckeyfilename,
445
523
GNUTLS_OPENPGP_FMT_BASE64);
446
524
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));
525
fprintf_plus(stderr,
526
"Error[%d] while reading the OpenPGP key pair ('%s',"
527
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
528
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
529
safer_gnutls_strerror(ret));
452
530
goto globalfail;
453
531
}
454
532
455
533
/* GnuTLS server initialization */
456
ret = gnutls_dh_params_init(&mc.dh_params);
534
ret = gnutls_dh_params_init(&mc->dh_params);
457
535
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
536
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
537
" initialization: %s\n",
538
safer_gnutls_strerror(ret));
460
539
goto globalfail;
461
540
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
463
542
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
543
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
544
safer_gnutls_strerror(ret));
466
545
goto globalfail;
467
546
}
468
547
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
548
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
470
549
471
550
return 0;
472
551
473
552
globalfail:
474
553
475
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_certificate_free_credentials(mc->cred);
476
555
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
556
gnutls_dh_params_deinit(mc->dh_params);
478
557
return -1;
479
558
}
480
559
481
static int init_gnutls_session(gnutls_session_t *session){
560
static int init_gnutls_session(gnutls_session_t *session,
561
mandos_context *mc){
482
562
int ret;
483
563
/* GnuTLS session creation */
484
564
do {
488
568
}
489
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
570
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
493
574
}
494
575
495
576
{
496
577
const char *err;
497
578
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
579
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
499
580
if(quit_now){
500
581
gnutls_deinit(*session);
501
582
return -1;
502
583
}
503
584
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
585
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));
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
508
589
gnutls_deinit(*session);
509
590
return -1;
510
591
}
512
593
513
594
do {
514
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
596
mc->cred);
516
597
if(quit_now){
517
598
gnutls_deinit(*session);
518
599
return -1;
519
600
}
520
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
602
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
524
605
gnutls_deinit(*session);
525
606
return -1;
526
607
}
528
609
/* ignore client certificate if any. */
529
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
530
611
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
612
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
532
613
533
614
return 0;
534
615
}
538
619
__attribute__((unused)) const char *txt){}
539
620
540
621
/* Called when a Mandos server is found */
541
static int start_mandos_communication(const char *ip, uint16_t port,
622
static int start_mandos_communication(const char *ip, in_port_t port,
542
623
AvahiIfIndex if_index,
543
int af){
624
int af, mandos_context *mc){
544
625
int ret, tcp_sd = -1;
545
626
ssize_t sret;
546
627
union {
571
652
pf = PF_INET;
572
653
break;
573
654
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
575
656
errno = EINVAL;
576
657
return -1;
577
658
}
578
659
579
ret = init_gnutls_session(&session);
660
ret = init_gnutls_session(&session, mc);
580
661
if(ret != 0){
581
662
return -1;
582
663
}
583
664
584
665
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIuMAX "\n", ip, (uintmax_t)port);
587
668
}
588
669
589
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
671
if(tcp_sd < 0){
591
672
int e = errno;
592
perror("socket");
673
perror_plus("socket");
593
674
errno = e;
594
675
goto mandos_end;
595
676
}
609
690
}
610
691
if(ret < 0 ){
611
692
int e = errno;
612
perror("inet_pton");
693
perror_plus("inet_pton");
613
694
errno = e;
614
695
goto mandos_end;
615
696
}
616
697
if(ret == 0){
617
698
int e = errno;
618
fprintf(stderr, "Bad address: %s\n", ip);
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
619
700
errno = e;
620
701
goto mandos_end;
621
702
}
622
703
if(af == AF_INET6){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
704
to.in6.sin6_port = htons(port);
627
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
707
-Wunreachable-code*/
630
708
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
709
fprintf_plus(stderr, "An IPv6 link-local address is"
710
" incomplete without a network interface\n");
633
711
errno = EINVAL;
634
712
goto mandos_end;
635
713
}
651
729
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
730
char interface[IF_NAMESIZE];
653
731
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
732
perror_plus("if_indextoname");
655
733
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
658
736
}
659
737
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
662
740
}
663
741
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
742
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
671
749
sizeof(addrstr));
672
750
}
673
751
if(pcret == NULL){
674
perror("inet_ntop");
752
perror_plus("inet_ntop");
675
753
} else {
676
754
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
678
756
}
679
757
}
680
758
}
692
770
if(ret < 0){
693
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
772
int e = errno;
695
perror("connect");
773
perror_plus("connect");
696
774
errno = e;
697
775
}
698
776
goto mandos_end;
708
786
while(true){
709
787
size_t out_size = strlen(out);
710
788
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
out_size - written));
789
out_size - written));
712
790
if(ret == -1){
713
791
int e = errno;
714
perror("write");
792
perror_plus("write");
715
793
errno = e;
716
794
goto mandos_end;
717
795
}
734
812
}
735
813
736
814
if(debug){
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
815
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
738
816
}
739
817
740
818
if(quit_now){
742
820
goto mandos_end;
743
821
}
744
822
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
823
/* This casting via intptr_t is to eliminate warning about casting
824
an int to a pointer type. This is exactly how the GnuTLS Guile
825
function "set-session-transport-fd!" does it. */
826
gnutls_transport_set_ptr(session,
827
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
746
828
747
829
if(quit_now){
748
830
errno = EINTR;
759
841
760
842
if(ret != GNUTLS_E_SUCCESS){
761
843
if(debug){
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
844
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
763
845
gnutls_perror(ret);
764
846
}
765
847
errno = EPROTO;
769
851
/* Read OpenPGP packet that contains the wanted password */
770
852
771
853
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
854
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
855
" %s\n", ip);
774
856
}
775
857
776
858
while(true){
781
863
}
782
864
783
865
buffer_capacity = incbuffer(&buffer, buffer_length,
784
buffer_capacity);
866
buffer_capacity);
785
867
if(buffer_capacity == 0){
786
868
int e = errno;
787
perror("incbuffer");
869
perror_plus("incbuffer");
788
870
errno = e;
789
871
goto mandos_end;
790
872
}
814
896
}
815
897
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
898
if(ret < 0){
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
899
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
900
"***\n");
818
901
gnutls_perror(ret);
819
902
errno = EPROTO;
820
903
goto mandos_end;
821
904
}
822
905
break;
823
906
default:
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
907
fprintf_plus(stderr, "Unknown error while reading data from"
908
" encrypted session with Mandos server\n");
826
909
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
910
errno = EIO;
828
911
goto mandos_end;
833
916
}
834
917
835
918
if(debug){
836
fprintf(stderr, "Closing TLS session\n");
919
fprintf_plus(stderr, "Closing TLS session\n");
837
920
}
838
921
839
922
if(quit_now){
851
934
852
935
if(buffer_length > 0){
853
936
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
856
&decrypted_buffer);
937
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
938
&decrypted_buffer, mc);
857
939
if(decrypted_buffer_size >= 0){
858
940
859
941
written = 0;
869
951
if(ret == 0 and ferror(stdout)){
870
952
int e = errno;
871
953
if(debug){
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
954
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
955
strerror(errno));
874
956
}
875
957
errno = e;
876
958
goto mandos_end;
895
977
if(e == 0){
896
978
e = errno;
897
979
}
898
perror("close");
980
perror_plus("close");
899
981
}
900
982
gnutls_deinit(session);
983
errno = e;
901
984
if(quit_now){
902
e = EINTR;
985
errno = EINTR;
903
986
retval = -1;
904
987
}
905
errno = e;
906
988
}
907
989
return retval;
908
990
}
920
1002
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
1003
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
1004
flags,
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
1005
void* mc){
1006
if(r == NULL){
1007
return;
1008
}
925
1009
926
1010
/* Called whenever a service has been resolved successfully or
927
1011
timed out */
933
1017
switch(event){
934
1018
default:
935
1019
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)));
1020
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
domain,
1023
avahi_strerror(avahi_server_errno
1024
(((mandos_context*)mc)->server)));
939
1025
break;
940
1026
941
1027
case AVAHI_RESOLVER_FOUND:
943
1029
char ip[AVAHI_ADDRESS_STR_MAX];
944
1030
avahi_address_snprint(ip, sizeof(ip), address);
945
1031
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);
1032
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
host_name, ip, (intmax_t)interface, port);
949
1035
}
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
1036
int ret = start_mandos_communication(ip, (in_port_t)port,
1037
interface,
1038
avahi_proto_to_af(proto),
1039
mc);
952
1040
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
1041
avahi_simple_poll_quit(simple_poll);
1042
} else {
1043
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto),
1045
&((mandos_context*)mc)->current_server)){
1046
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1047
" list\n", name);
1048
}
954
1049
}
955
1050
}
956
1051
}
966
1061
const char *domain,
967
1062
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
1063
flags,
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
1064
void* mc){
1065
if(b == NULL){
1066
return;
1067
}
971
1068
972
1069
/* Called whenever a new services becomes available on the LAN or
973
1070
is removed from the LAN */
980
1077
default:
981
1078
case AVAHI_BROWSER_FAILURE:
982
1079
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1080
fprintf_plus(stderr, "(Avahi browser) %s\n",
1081
avahi_strerror(avahi_server_errno
1082
(((mandos_context*)mc)->server)));
1083
avahi_simple_poll_quit(simple_poll);
986
1084
return;
987
1085
988
1086
case AVAHI_BROWSER_NEW:
991
1089
the callback function is called the Avahi server will free the
992
1090
resolver for us. */
993
1091
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)));
1092
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1093
interface, protocol, name, type,
1094
domain, protocol, 0,
1095
resolve_callback, mc) == NULL)
1096
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1097
" %s\n", name,
1098
avahi_strerror(avahi_server_errno
1099
(((mandos_context*)mc)->server)));
999
1100
break;
1000
1101
1001
1102
case AVAHI_BROWSER_REMOVE:
1004
1105
case AVAHI_BROWSER_ALL_FOR_NOW:
1005
1106
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1006
1107
if(debug){
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1108
fprintf_plus(stderr, "No Mandos server found, still"
1109
" searching...\n");
1008
1110
}
1009
1111
break;
1010
1112
}
1011
1113
}
1012
1114
1013
/* stop main loop after sigterm has been called */
1115
/* Signal handler that stops main loop after SIGTERM */
1014
1116
static void handle_sigterm(int sig){
1015
1117
if(quit_now){
1016
1118
return;
1018
1120
quit_now = 1;
1019
1121
signal_received = sig;
1020
1122
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1123
/* set main loop to exit */
1124
if(simple_poll != NULL){
1125
avahi_simple_poll_quit(simple_poll);
1023
1126
}
1024
1127
errno = old_errno;
1025
1128
}
1026
1129
1130
bool get_flags(const char *ifname, struct ifreq *ifr){
1131
int ret;
1132
error_t ret_errno;
1133
1134
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1135
if(s < 0){
1136
ret_errno = errno;
1137
perror_plus("socket");
1138
errno = ret_errno;
1139
return false;
1140
}
1141
strcpy(ifr->ifr_name, ifname);
1142
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1143
if(ret == -1){
1144
if(debug){
1145
ret_errno = errno;
1146
perror_plus("ioctl SIOCGIFFLAGS");
1147
errno = ret_errno;
1148
}
1149
return false;
1150
}
1151
return true;
1152
}
1153
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
if(debug){
1159
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1160
ifname);
1161
}
1162
return false;
1163
}
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
if(debug){
1167
fprintf_plus(stderr, "Accepting point-to-point interface"
1168
" \"%s\"\n", ifname);
1169
}
1170
return true;
1171
}
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
if(debug){
1175
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1176
" \"%s\"\n", ifname);
1177
}
1178
return false;
1179
}
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1182
if(debug){
1183
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1184
ifname);
1185
}
1186
return false;
1187
}
1188
1189
/* Accept this device */
1190
if(debug){
1191
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1192
}
1193
return true;
1194
}
1195
1027
1196
/*
1028
1197
* This function determines if a directory entry in /sys/class/net
1029
1198
* corresponds to an acceptable network device.
1030
1199
* (This function is passed to scandir(3) as a filter function.)
1031
1200
*/
1032
1201
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
1202
if(if_entry->d_name[0] == '.'){
1042
1203
return 0;
1043
1204
}
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){
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
if(not good_flags(if_entry->d_name, &ifr)){
1216
return 0;
1217
}
1218
return 1;
1219
}
1220
1221
/*
1222
* This function determines if a network interface is up.
1223
*/
1224
bool interface_is_up(const char *interface){
1225
struct ifreq ifr;
1226
if(not get_flags(interface, &ifr)){
1227
if(debug){
1228
fprintf_plus(stderr, "Failed to get flags for interface "
1229
"\"%s\"\n", interface);
1230
}
1231
return false;
1232
}
1233
1234
return (bool)(ifr.ifr_flags & IFF_UP);
1235
}
1236
1237
/*
1238
* This function determines if a network interface is running
1239
*/
1240
bool interface_is_running(const char *interface){
1241
struct ifreq ifr;
1242
if(not get_flags(interface, &ifr)){
1243
if(debug){
1244
fprintf_plus(stderr, "Failed to get flags for interface "
1245
"\"%s\"\n", interface);
1246
}
1247
return false;
1248
}
1249
1250
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1251
}
1252
1253
int notdotentries(const struct dirent *direntry){
1254
/* Skip "." and ".." */
1255
if(direntry->d_name[0] == '.'
1256
and (direntry->d_name[1] == '\0'
1257
or (direntry->d_name[1] == '.'
1258
and direntry->d_name[2] == '\0'))){
1259
return 0;
1260
}
1261
return 1;
1262
}
1263
1264
/* Is this directory entry a runnable program? */
1265
int runnable_hook(const struct dirent *direntry){
1266
int ret;
1267
size_t sret;
1268
struct stat st;
1269
1270
if((direntry->d_name)[0] == '\0'){
1271
/* Empty name? */
1272
return 0;
1273
}
1274
1275
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1276
"abcdefghijklmnopqrstuvwxyz"
1277
"0123456789"
1278
"_-");
1279
if((direntry->d_name)[sret] != '\0'){
1280
/* Contains non-allowed characters */
1281
if(debug){
1282
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1283
direntry->d_name);
1284
}
1285
return 0;
1286
}
1287
1288
char *fullname = NULL;
1289
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1290
if(ret < 0){
1291
perror_plus("asprintf");
1292
return 0;
1293
}
1294
1295
ret = stat(fullname, &st);
1296
if(ret == -1){
1297
if(debug){
1298
perror_plus("Could not stat hook");
1299
}
1300
return 0;
1301
}
1302
if(not (S_ISREG(st.st_mode))){
1303
/* Not a regular file */
1304
if(debug){
1305
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1306
direntry->d_name);
1307
}
1308
return 0;
1309
}
1310
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1311
/* Not executable */
1312
if(debug){
1313
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1314
direntry->d_name);
1315
}
1316
return 0;
1317
}
1318
if(debug){
1319
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1320
direntry->d_name);
1321
}
1322
return 1;
1323
}
1324
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1326
mandos_context *mc){
1327
int ret;
1328
struct timespec now;
1329
struct timespec waited_time;
1330
intmax_t block_time;
1331
1332
while(true){
1333
if(mc->current_server == NULL){
1334
if (debug){
1335
fprintf_plus(stderr, "Wait until first server is found."
1336
" No timeout!\n");
1337
}
1338
ret = avahi_simple_poll_iterate(s, -1);
1339
} else {
1340
if (debug){
1341
fprintf_plus(stderr, "Check current_server if we should run"
1342
" it, or wait\n");
1343
}
1344
/* the current time */
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1346
if(ret == -1){
1347
perror_plus("clock_gettime");
1348
return -1;
1349
}
1350
/* Calculating in ms how long time between now and server
1351
who we visted longest time ago. Now - last seen. */
1352
waited_time.tv_sec = (now.tv_sec
1353
- mc->current_server->last_seen.tv_sec);
1354
waited_time.tv_nsec = (now.tv_nsec
1355
- mc->current_server->last_seen.tv_nsec);
1356
/* total time is 10s/10,000ms.
1357
Converting to s from ms by dividing by 1,000,
1358
and ns to ms by dividing by 1,000,000. */
1359
block_time = ((retry_interval
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
1363
if (debug){
1364
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1365
block_time);
1366
}
1367
1368
if(block_time <= 0){
1369
ret = start_mandos_communication(mc->current_server->ip,
1370
mc->current_server->port,
1371
mc->current_server->if_index,
1372
mc->current_server->af, mc);
1373
if(ret == 0){
1374
avahi_simple_poll_quit(s);
1375
return 0;
1376
}
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc->current_server->last_seen);
1379
if(ret == -1){
1380
perror_plus("clock_gettime");
1381
return -1;
1382
}
1383
mc->current_server = mc->current_server->next;
1384
block_time = 0; /* Call avahi to find new Mandos
1385
servers, but don't block */
1386
}
1387
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1389
}
1390
if(ret != 0){
1391
if (ret > 0 or errno != EINTR){
1392
return (ret != 1) ? ret : 0;
1393
}
1394
}
1395
}
1396
}
1397
1398
/* Set effective uid to 0, return errno */
1399
error_t raise_privileges(void){
1400
error_t old_errno = errno;
1401
error_t ret_errno = 0;
1402
if(seteuid(0) == -1){
1403
ret_errno = errno;
1404
perror_plus("seteuid");
1405
}
1406
errno = old_errno;
1407
return ret_errno;
1408
}
1409
1410
/* Set effective and real user ID to 0. Return errno. */
1411
error_t raise_privileges_permanently(void){
1412
error_t old_errno = errno;
1413
error_t ret_errno = raise_privileges();
1414
if(ret_errno != 0){
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
if(setuid(0) == -1){
1419
ret_errno = errno;
1420
perror_plus("seteuid");
1421
}
1422
errno = old_errno;
1423
return ret_errno;
1424
}
1425
1426
/* Set effective user ID to unprivileged saved user ID */
1427
error_t lower_privileges(void){
1428
error_t old_errno = errno;
1429
error_t ret_errno = 0;
1430
if(seteuid(uid) == -1){
1431
ret_errno = errno;
1432
perror_plus("seteuid");
1433
}
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
/* Lower privileges permanently */
1439
error_t lower_privileges_permanently(void){
1440
error_t old_errno = errno;
1441
error_t ret_errno = 0;
1442
if(setuid(uid) == -1){
1443
ret_errno = errno;
1444
perror_plus("setuid");
1445
}
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
1450
bool run_network_hooks(const char *mode, const char *interface,
1451
const float delay){
1452
struct dirent **direntries;
1453
struct dirent *direntry;
1454
int ret;
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1456
alphasort);
1457
if(numhooks == -1){
1458
if(errno == ENOENT){
1459
if(debug){
1460
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1461
" found\n", hookdir);
1462
}
1463
} else {
1464
perror_plus("scandir");
1465
}
1466
} else {
1467
int devnull = open("/dev/null", O_RDONLY);
1468
for(int i = 0; i < numhooks; i++){
1469
direntry = direntries[i];
1470
char *fullname = NULL;
1471
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1472
if(ret < 0){
1473
perror_plus("asprintf");
1474
continue;
1475
}
1476
if(debug){
1477
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1478
direntry->d_name);
1479
}
1480
pid_t hook_pid = fork();
1481
if(hook_pid == 0){
1482
/* Child */
1483
/* Raise privileges */
1484
raise_privileges_permanently();
1485
/* Set group */
1486
errno = 0;
1487
ret = setgid(0);
1488
if(ret == -1){
1489
perror_plus("setgid");
1490
}
1491
/* Reset supplementary groups */
1492
errno = 0;
1493
ret = setgroups(0, NULL);
1494
if(ret == -1){
1495
perror_plus("setgroups");
1496
}
1497
dup2(devnull, STDIN_FILENO);
1498
close(devnull);
1499
dup2(STDERR_FILENO, STDOUT_FILENO);
1500
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("DEVICE", interface, 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
ret = setenv("MODE", mode, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
char *delaystring;
1521
ret = asprintf(&delaystring, "%f", delay);
1522
if(ret == -1){
1523
perror_plus("asprintf");
1524
_exit(EX_OSERR);
1525
}
1526
ret = setenv("DELAY", delaystring, 1);
1527
if(ret == -1){
1528
free(delaystring);
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1532
free(delaystring);
1533
if(connect_to != NULL){
1534
ret = setenv("CONNECT", connect_to, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
}
1540
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1541
perror_plus("execl");
1542
_exit(EXIT_FAILURE);
1543
}
1544
} else {
1545
int status;
1546
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1547
perror_plus("waitpid");
1548
free(fullname);
1549
continue;
1550
}
1551
if(WIFEXITED(status)){
1552
if(WEXITSTATUS(status) != 0){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1554
" with status %d\n", direntry->d_name,
1555
WEXITSTATUS(status));
1556
free(fullname);
1557
continue;
1558
}
1559
} else if(WIFSIGNALED(status)){
1560
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1561
" signal %d\n", direntry->d_name,
1562
WTERMSIG(status));
1563
free(fullname);
1564
continue;
1565
} else {
1566
fprintf_plus(stderr, "Warning: network hook \"%s\""
1567
" crashed\n", direntry->d_name);
1568
free(fullname);
1569
continue;
1570
}
1571
}
1572
free(fullname);
1573
if(debug){
1574
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1575
direntry->d_name);
1576
}
1577
}
1578
close(devnull);
1579
}
1580
return true;
1581
}
1582
1583
error_t bring_up_interface(const char *const interface,
1584
const float delay){
1585
int sd = -1;
1586
error_t old_errno = errno;
1587
error_t ret_errno = 0;
1588
int ret, ret_setflags;
1589
struct ifreq network;
1590
unsigned int if_index = if_nametoindex(interface);
1591
if(if_index == 0){
1592
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1593
errno = old_errno;
1594
return ENXIO;
1595
}
1596
1597
if(quit_now){
1598
errno = old_errno;
1599
return EINTR;
1600
}
1601
1602
if(not interface_is_up(interface)){
1603
if(not get_flags(interface, &network) and debug){
1604
ret_errno = errno;
1605
fprintf_plus(stderr, "Failed to get flags for interface "
1606
"\"%s\"\n", interface);
1607
return ret_errno;
1608
}
1609
network.ifr_flags |= IFF_UP;
1610
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1612
if(sd < 0){
1613
ret_errno = errno;
1614
perror_plus("socket");
1615
errno = old_errno;
1616
return ret_errno;
1617
}
1618
1619
if(quit_now){
1620
close(sd);
1621
errno = old_errno;
1622
return EINTR;
1623
}
1624
1625
if(debug){
1626
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1627
interface);
1628
}
1629
1630
/* Raise priviliges */
1631
raise_privileges();
1632
1633
#ifdef __linux__
1634
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1635
messages about the network interface to mess up the prompt */
1636
int ret_linux = klogctl(8, NULL, 5);
1637
bool restore_loglevel = true;
1638
if(ret_linux == -1){
1639
restore_loglevel = false;
1640
perror_plus("klogctl");
1641
}
1642
#endif /* __linux__ */
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1644
ret_errno = errno;
1645
#ifdef __linux__
1646
if(restore_loglevel){
1647
ret_linux = klogctl(7, NULL, 0);
1648
if(ret_linux == -1){
1649
perror_plus("klogctl");
1650
}
1651
}
1652
#endif /* __linux__ */
1653
1654
/* Lower privileges */
1655
lower_privileges();
1656
1657
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1659
if(ret == -1){
1660
perror_plus("close");
1661
}
1662
1663
if(ret_setflags == -1){
1664
errno = ret_errno;
1665
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1666
errno = old_errno;
1667
return ret_errno;
1668
}
1669
} else if(debug){
1670
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1671
interface);
1672
}
1673
1674
/* Sleep checking until interface is running.
1675
Check every 0.25s, up to total time of delay */
1676
for(int i=0; i < delay * 4; i++){
1677
if(interface_is_running(interface)){
1070
1678
break;
1071
1679
}
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;
1680
struct timespec sleeptime = { .tv_nsec = 250000000 };
1681
ret = nanosleep(&sleeptime, NULL);
1682
if(ret == -1 and errno != EINTR){
1683
perror_plus("nanosleep");
1684
}
1685
}
1686
1687
errno = old_errno;
1688
return 0;
1689
}
1690
1691
error_t take_down_interface(const char *const interface){
1692
int sd = -1;
1693
error_t old_errno = errno;
1694
error_t ret_errno = 0;
1695
int ret, ret_setflags;
1696
struct ifreq network;
1697
unsigned int if_index = if_nametoindex(interface);
1698
if(if_index == 0){
1699
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1700
errno = old_errno;
1701
return ENXIO;
1702
}
1703
if(interface_is_up(interface)){
1704
if(not get_flags(interface, &network) and debug){
1705
ret_errno = errno;
1706
fprintf_plus(stderr, "Failed to get flags for interface "
1707
"\"%s\"\n", interface);
1708
return ret_errno;
1709
}
1710
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1711
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1713
if(sd < 0){
1714
ret_errno = errno;
1715
perror_plus("socket");
1716
errno = old_errno;
1717
return ret_errno;
1718
}
1719
1720
if(debug){
1721
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1722
interface);
1723
}
1724
1725
/* Raise priviliges */
1726
raise_privileges();
1727
1728
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1729
ret_errno = errno;
1730
1731
/* Lower privileges */
1732
lower_privileges();
1733
1734
/* Close the socket */
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1736
if(ret == -1){
1737
perror_plus("close");
1738
}
1739
1740
if(ret_setflags == -1){
1741
errno = ret_errno;
1742
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1743
errno = old_errno;
1744
return ret_errno;
1745
}
1746
} else if(debug){
1747
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1748
interface);
1749
}
1750
1751
errno = old_errno;
1752
return 0;
1120
1753
}
1121
1754
1122
1755
int main(int argc, char *argv[]){
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1757
.priority = "SECURE256:!CTYPE-X.509:"
1758
"+CTYPE-OPENPGP", .current_server = NULL };
1123
1759
AvahiSServiceBrowser *sb = NULL;
1124
int error;
1760
error_t ret_errno;
1125
1761
int ret;
1126
1762
intmax_t tmpmax;
1127
1763
char *tmp;
1128
1764
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;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1767
char *interfaces_to_take_down = NULL;
1768
size_t interfaces_to_take_down_size = 0;
1135
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1136
1770
bool tempdir_created = false;
1137
1771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1138
1772
const char *seckey = PATHDIR "/" SECKEY;
1139
1773
const char *pubkey = PATHDIR "/" PUBKEY;
1774
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1140
1776
1141
1777
bool gnutls_initialized = false;
1142
1778
bool gpgme_initialized = false;
1143
1779
float delay = 2.5f;
1780
double retry_interval = 10; /* 10s between trying a server and
1781
retrying the same server again */
1144
1782
1145
1783
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
1784
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1152
1790
errno = 0;
1153
1791
ret = setgid(gid);
1154
1792
if(ret == -1){
1155
perror("setgid");
1793
perror_plus("setgid");
1156
1794
}
1157
1795
1158
1796
/* Lower user privileges (temporarily) */
1159
1797
errno = 0;
1160
1798
ret = seteuid(uid);
1161
1799
if(ret == -1){
1162
perror("seteuid");
1800
perror_plus("seteuid");
1163
1801
}
1164
1802
1165
1803
if(quit_now){
1200
1838
.arg = "SECONDS",
1201
1839
.doc = "Maximum delay to wait for interface startup",
1202
1840
.group = 2 },
1841
{ .name = "retry", .key = 132,
1842
.arg = "SECONDS",
1843
.doc = "Retry interval used when denied by the Mandos server",
1844
.group = 2 },
1845
{ .name = "network-hook-dir", .key = 133,
1846
.arg = "DIR",
1847
.doc = "Directory where network hooks are located",
1848
.group = 2 },
1203
1849
/*
1204
1850
* These reproduce what we would get without ARGP_NO_HELP
1205
1851
*/
1223
1869
connect_to = arg;
1224
1870
break;
1225
1871
case 'i': /* --interface */
1226
interface = arg;
1872
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1873
(int)',');
1874
if(ret_errno != 0){
1875
argp_error(state, "%s", strerror(ret_errno));
1876
}
1227
1877
break;
1228
1878
case 's': /* --seckey */
1229
1879
seckey = arg;
1249
1899
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
1900
argp_error(state, "Bad delay");
1251
1901
}
1902
case 132: /* --retry */
1903
errno = 0;
1904
retry_interval = strtod(arg, &tmp);
1905
if(errno != 0 or tmp == arg or *tmp != '\0'
1906
or (retry_interval * 1000) > INT_MAX
1907
or retry_interval < 0){
1908
argp_error(state, "Bad retry interval");
1909
}
1910
break;
1911
case 133: /* --network-hook-dir */
1912
hookdir = arg;
1252
1913
break;
1253
1914
/*
1254
1915
* These reproduce what we would get without ARGP_NO_HELP
1261
1922
argp_state_help(state, state->out_stream,
1262
1923
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
1924
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1925
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1265
1926
exit(argp_err_exit_status);
1266
1927
break;
1267
1928
default:
1282
1943
case ENOMEM:
1283
1944
default:
1284
1945
errno = ret;
1285
perror("argp_parse");
1946
perror_plus("argp_parse");
1286
1947
exitcode = EX_OSERR;
1287
1948
goto end;
1288
1949
case EINVAL:
1290
1951
goto end;
1291
1952
}
1292
1953
}
1954
1955
{
1956
/* Work around Debian bug #633582:
1957
<http://bugs.debian.org/633582> */
1958
1959
/* Re-raise priviliges */
1960
if(raise_privileges() == 0){
1961
struct stat st;
1962
1963
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1964
int seckey_fd = open(seckey, O_RDONLY);
1965
if(seckey_fd == -1){
1966
perror_plus("open");
1967
} else {
1968
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1969
if(ret == -1){
1970
perror_plus("fstat");
1971
} else {
1972
if(S_ISREG(st.st_mode)
1973
and st.st_uid == 0 and st.st_gid == 0){
1974
ret = fchown(seckey_fd, uid, gid);
1975
if(ret == -1){
1976
perror_plus("fchown");
1977
}
1978
}
1979
}
1980
TEMP_FAILURE_RETRY(close(seckey_fd));
1981
}
1982
}
1983
1984
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1985
int pubkey_fd = open(pubkey, O_RDONLY);
1986
if(pubkey_fd == -1){
1987
perror_plus("open");
1988
} else {
1989
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1990
if(ret == -1){
1991
perror_plus("fstat");
1992
} else {
1993
if(S_ISREG(st.st_mode)
1994
and st.st_uid == 0 and st.st_gid == 0){
1995
ret = fchown(pubkey_fd, uid, gid);
1996
if(ret == -1){
1997
perror_plus("fchown");
1998
}
1999
}
2000
}
2001
TEMP_FAILURE_RETRY(close(pubkey_fd));
2002
}
2003
}
2004
2005
/* Lower privileges */
2006
errno = 0;
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2010
}
2011
}
2012
}
2013
2014
/* Remove empty interface names */
2015
{
2016
char *interface = NULL;
2017
while((interface = argz_next(interfaces, interfaces_size,
2018
interface))){
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2021
fprintf_plus(stderr, "Not using nonexisting interface"
2022
" \"%s\"\n", interface);
2023
}
2024
argz_delete(&interfaces, &interfaces_size, interface);
2025
interface = NULL;
2026
}
2027
}
2028
}
2029
2030
/* Run network hooks */
2031
{
2032
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2035
if(interfaces_hooks == NULL){
2036
perror_plus("malloc");
2037
goto end;
2038
}
2039
memcpy(interfaces_hooks, interfaces, interfaces_size);
2040
interfaces_hooks_size = interfaces_size;
2041
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2042
(int)',');
2043
}
2044
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2045
interfaces_hooks : "", delay)){
2046
goto end;
2047
}
2048
}
1293
2049
1294
2050
if(not debug){
1295
2051
avahi_set_log_function(empty_log);
1296
2052
}
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
2053
1323
2054
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
2055
from the signal handler */
1325
2056
/* Initialize the pseudo-RNG for Avahi */
1326
2057
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");
2058
simple_poll = avahi_simple_poll_new();
2059
if(simple_poll == NULL){
2060
fprintf_plus(stderr,
2061
"Avahi: Failed to create simple poll object.\n");
1330
2062
exitcode = EX_UNAVAILABLE;
1331
2063
goto end;
1332
2064
}
1334
2066
sigemptyset(&sigterm_action.sa_mask);
1335
2067
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
2068
if(ret == -1){
1337
perror("sigaddset");
2069
perror_plus("sigaddset");
1338
2070
exitcode = EX_OSERR;
1339
2071
goto end;
1340
2072
}
1341
2073
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
2074
if(ret == -1){
1343
perror("sigaddset");
2075
perror_plus("sigaddset");
1344
2076
exitcode = EX_OSERR;
1345
2077
goto end;
1346
2078
}
1347
2079
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
2080
if(ret == -1){
1349
perror("sigaddset");
2081
perror_plus("sigaddset");
1350
2082
exitcode = EX_OSERR;
1351
2083
goto end;
1352
2084
}
1356
2088
*/
1357
2089
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
2090
if(ret == -1){
1359
perror("sigaction");
2091
perror_plus("sigaction");
1360
2092
return EX_OSERR;
1361
2093
}
1362
2094
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
2095
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
2096
if(ret == -1){
1365
perror("sigaction");
2097
perror_plus("sigaction");
1366
2098
exitcode = EX_OSERR;
1367
2099
goto end;
1368
2100
}
1369
2101
}
1370
2102
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
2103
if(ret == -1){
1372
perror("sigaction");
2104
perror_plus("sigaction");
1373
2105
return EX_OSERR;
1374
2106
}
1375
2107
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
2108
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
2109
if(ret == -1){
1378
perror("sigaction");
2110
perror_plus("sigaction");
1379
2111
exitcode = EX_OSERR;
1380
2112
goto end;
1381
2113
}
1382
2114
}
1383
2115
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
2116
if(ret == -1){
1385
perror("sigaction");
2117
perror_plus("sigaction");
1386
2118
return EX_OSERR;
1387
2119
}
1388
2120
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
2121
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
2122
if(ret == -1){
1391
perror("sigaction");
2123
perror_plus("sigaction");
1392
2124
exitcode = EX_OSERR;
1393
2125
goto end;
1394
2126
}
1395
2127
}
1396
2128
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");
1482
}
1483
}
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
break;
1501
}
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
}
2129
/* If no interfaces were specified, make a list */
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2132
/* Look for any good interfaces */
2133
ret = scandir(sys_class_net, &direntries, good_interface,
2134
alphasort);
2135
if(ret >= 1){
2136
/* Add all found interfaces to interfaces list */
2137
for(int i = 0; i < ret; ++i){
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2139
direntries[i]->d_name);
2140
if(ret_errno != 0){
2141
perror_plus("argz_add");
2142
continue;
2143
}
2144
if(debug){
2145
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2146
direntries[i]->d_name);
2147
}
2148
}
2149
free(direntries);
1532
2150
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
2151
free(direntries);
2152
fprintf_plus(stderr, "Could not find a network interface\n");
2153
exitcode = EXIT_FAILURE;
2154
goto end;
2155
}
2156
}
2157
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2160
if(debug){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2162
interfaces);
2163
}
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2165
}
2166
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2170
char *interface = NULL;
2171
while((interface = argz_next(interfaces, interfaces_size,
2172
interface))){
2173
bool interface_was_up = interface_is_up(interface);
2174
ret = bring_up_interface(interface, delay);
2175
if(not interface_was_up){
2176
if(ret != 0){
2177
errno = ret;
2178
perror_plus("Failed to bring up interface");
2179
} else {
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2182
interface);
2183
}
1537
2184
}
1538
2185
}
2186
free(interfaces);
2187
interfaces = NULL;
2188
interfaces_size = 0;
2189
if(debug and (interfaces_to_take_down == NULL)){
2190
fprintf_plus(stderr, "No interfaces were brought up\n");
2191
}
1539
2192
}
1540
2193
1541
2194
if(quit_now){
1542
2195
goto end;
1543
2196
}
1544
2197
1545
ret = init_gnutls_global(pubkey, seckey);
2198
ret = init_gnutls_global(pubkey, seckey, &mc);
1546
2199
if(ret == -1){
1547
fprintf(stderr, "init_gnutls_global failed\n");
2200
fprintf_plus(stderr, "init_gnutls_global failed\n");
1548
2201
exitcode = EX_UNAVAILABLE;
1549
2202
goto end;
1550
2203
} else {
1555
2208
goto end;
1556
2209
}
1557
2210
2211
if(mkdtemp(tempdir) == NULL){
2212
perror_plus("mkdtemp");
2213
goto end;
2214
}
1558
2215
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
1562
goto end;
1563
}
1564
2216
1565
2217
if(quit_now){
1566
2218
goto end;
1567
2219
}
1568
2220
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2221
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2222
fprintf_plus(stderr, "init_gpgme failed\n");
1571
2223
exitcode = EX_UNAVAILABLE;
1572
2224
goto end;
1573
2225
} else {
1582
2234
/* Connect directly, do not use Zeroconf */
1583
2235
/* (Mainly meant for debugging) */
1584
2236
char *address = strrchr(connect_to, ':');
2237
1585
2238
if(address == NULL){
1586
fprintf(stderr, "No colon in address\n");
2239
fprintf_plus(stderr, "No colon in address\n");
1587
2240
exitcode = EX_USAGE;
1588
2241
goto end;
1589
2242
}
1592
2245
goto end;
1593
2246
}
1594
2247
1595
uint16_t port;
2248
in_port_t port;
1596
2249
errno = 0;
1597
2250
tmpmax = strtoimax(address+1, &tmp, 10);
1598
2251
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2252
or tmpmax != (in_port_t)tmpmax){
2253
fprintf_plus(stderr, "Bad port number\n");
1601
2254
exitcode = EX_USAGE;
1602
2255
goto end;
1603
2256
}
1606
2259
goto end;
1607
2260
}
1608
2261
1609
port = (uint16_t)tmpmax;
2262
port = (in_port_t)tmpmax;
1610
2263
*address = '\0';
1611
address = connect_to;
1612
2264
/* Colon in address indicates IPv6 */
1613
2265
int af;
1614
if(strchr(address, ':') != NULL){
2266
if(strchr(connect_to, ':') != NULL){
1615
2267
af = AF_INET6;
2268
/* Accept [] around IPv6 address - see RFC 5952 */
2269
if(connect_to[0] == '[' and address[-1] == ']')
2270
{
2271
connect_to++;
2272
address[-1] = '\0';
2273
}
1616
2274
} else {
1617
2275
af = AF_INET;
1618
2276
}
2277
address = connect_to;
1619
2278
1620
2279
if(quit_now){
1621
2280
goto end;
1622
2281
}
1623
2282
1624
2283
while(not quit_now){
1625
ret = start_mandos_communication(address, port, if_index, af);
2284
ret = start_mandos_communication(address, port, if_index, af,
2285
&mc);
1626
2286
if(quit_now or ret == 0){
1627
2287
break;
1628
2288
}
1629
sleep(15);
1630
};
1631
2289
if(debug){
2290
fprintf_plus(stderr, "Retrying in %d seconds\n",
2291
(int)retry_interval);
2292
}
2293
sleep((int)retry_interval);
2294
}
2295
1632
2296
if (not quit_now){
1633
2297
exitcode = EXIT_SUCCESS;
1634
2298
}
1635
2299
1636
2300
goto end;
1637
2301
}
1638
2302
1650
2314
config.publish_domain = 0;
1651
2315
1652
2316
/* Allocate a new server */
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
2317
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2318
&config, NULL, NULL, &ret_errno);
1656
2319
1657
2320
/* Free the Avahi configuration data */
1658
2321
avahi_server_config_free(&config);
1660
2323
1661
2324
/* Check if creating the Avahi server object succeeded */
1662
2325
if(mc.server == NULL){
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2326
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2327
avahi_strerror(ret_errno));
1665
2328
exitcode = EX_UNAVAILABLE;
1666
2329
goto end;
1667
2330
}
1673
2336
/* Create the Avahi service browser */
1674
2337
sb = avahi_s_service_browser_new(mc.server, if_index,
1675
2338
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1676
NULL, 0, browse_callback, NULL);
2339
NULL, 0, browse_callback,
2340
(void *)&mc);
1677
2341
if(sb == NULL){
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2342
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2343
avahi_strerror(avahi_server_errno(mc.server)));
1680
2344
exitcode = EX_UNAVAILABLE;
1681
2345
goto end;
1682
2346
}
1688
2352
/* Run the main loop */
1689
2353
1690
2354
if(debug){
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2355
fprintf_plus(stderr, "Starting Avahi loop search\n");
2356
}
2357
2358
ret = avahi_loop_with_timeout(simple_poll,
2359
(int)(retry_interval * 1000), &mc);
2360
if(debug){
2361
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2362
(ret == 0) ? "successfully" : "with error");
2363
}
1695
2364
1696
2365
end:
1697
2366
1698
2367
if(debug){
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2368
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1700
2369
}
1701
2370
1702
2371
/* Cleanup things */
1706
2375
if(mc.server != NULL)
1707
2376
avahi_server_free(mc.server);
1708
2377
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
2378
if(simple_poll != NULL)
2379
avahi_simple_poll_free(simple_poll);
1711
2380
1712
2381
if(gnutls_initialized){
1713
2382
gnutls_certificate_free_credentials(mc.cred);
1719
2388
gpgme_release(mc.ctx);
1720
2389
}
1721
2390
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");
2391
/* Cleans up the circular linked list of Mandos servers the client
2392
has seen */
2393
if(mc.current_server != NULL){
2394
mc.current_server->prev->next = NULL;
2395
while(mc.current_server != NULL){
2396
server *next = mc.current_server->next;
2397
free(mc.current_server);
2398
mc.current_server = next;
1729
2399
}
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");
2400
}
2401
2402
/* Re-raise priviliges */
2403
{
2404
raise_privileges();
2405
2406
/* Run network hooks */
2407
run_network_hooks("stop", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
2409
2410
/* Take down the network interfaces which were brought up */
2411
{
2412
char *interface = NULL;
2413
while((interface=argz_next(interfaces_to_take_down,
2414
interfaces_to_take_down_size,
2415
interface))){
2416
ret_errno = take_down_interface(interface);
2417
if(ret_errno != 0){
2418
errno = ret_errno;
2419
perror_plus("Failed to take down interface");
1739
2420
}
1740
2421
}
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");
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2424
" down\n");
1750
2425
}
1751
2426
}
2427
2428
lower_privileges_permanently();
1752
2429
}
1753
2430
1754
/* Removes the temp directory used by GPGME */
2431
free(interfaces_to_take_down);
2432
free(interfaces_hooks);
2433
2434
/* Removes the GPGME temp directory and all files inside */
1755
2435
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
}
2436
struct dirent **direntries = NULL;
2437
struct dirent *direntry = NULL;
2438
int numentries = scandir(tempdir, &direntries, notdotentries,
2439
alphasort);
2440
if (numentries > 0){
2441
for(int i = 0; i < numentries; i++){
2442
direntry = direntries[i];
1776
2443
char *fullname = NULL;
1777
2444
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
2445
direntry->d_name);
1779
2446
if(ret < 0){
1780
perror("asprintf");
2447
perror_plus("asprintf");
1781
2448
continue;
1782
2449
}
1783
2450
ret = remove(fullname);
1784
2451
if(ret == -1){
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2452
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2453
strerror(errno));
1787
2454
}
1788
2455
free(fullname);
1789
2456
}
1790
closedir(d);
2457
}
2458
2459
/* need to clean even if 0 because man page doesn't specify */
2460
free(direntries);
2461
if (numentries == -1){
2462
perror_plus("scandir");
1791
2463
}
1792
2464
ret = rmdir(tempdir);
1793
2465
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
2466
perror_plus("rmdir");
1795
2467
}
1796
2468
}
1797
2469
1802
2474
&old_sigterm_action,
1803
2475
NULL));
1804
2476
if(ret == -1){
1805
perror("sigaction");
2477
perror_plus("sigaction");
1806
2478
}
1807
2479
do {
1808
2480
ret = raise(signal_received);
1809
2481
} while(ret != 0 and errno == EINTR);
1810
2482
if(ret != 0){
1811
perror("raise");
2483
perror_plus("raise");
1812
2484
abort();
1813
2485
}
1814
2486
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0