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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:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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 */
66
#include <time.h> /* nanosleep(), time() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
69
69
if_nametoindex(), IF_NAMESIZE */
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>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
130
154
131
155
/* Used for passing in values through the Avahi callback functions */
132
156
typedef struct {
133
AvahiSimplePoll *simple_poll;
134
157
AvahiServer *server;
135
158
gnutls_certificate_credentials_t cred;
136
159
unsigned int dh_bits;
137
160
gnutls_dh_params_t dh_params;
138
161
const char *priority;
139
162
gpgme_ctx_t ctx;
163
server *current_server;
140
164
} mandos_context;
141
165
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
166
/* global so signal handler can reach it*/
167
AvahiSimplePoll *simple_poll;
146
168
147
169
sig_atomic_t quit_now = 0;
148
170
int signal_received = 0;
149
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
150
191
/*
151
192
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
193
* bytes. "buffer_capacity" is how much is currently allocated,
153
194
* "buffer_length" is how much is already used.
154
195
*/
155
196
size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
197
size_t buffer_capacity){
157
198
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
199
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
200
if(buffer == NULL){
164
205
return buffer_capacity;
165
206
}
166
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
167
245
/*
168
246
* Initialize GPGME.
169
247
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
172
250
gpgme_error_t rc;
173
251
gpgme_engine_info_t engine_info;
174
252
175
176
253
/*
177
254
* Helper function to insert pub and seckey to the engine keyring.
178
255
*/
183
260
184
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
262
if(fd == -1){
186
perror("open");
263
perror_plus("open");
187
264
return false;
188
265
}
189
266
190
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
268
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
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));
194
271
return false;
195
272
}
196
273
197
rc = gpgme_op_import(mc.ctx, pgp_data);
274
rc = gpgme_op_import(mc->ctx, pgp_data);
198
275
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
201
278
return false;
202
279
}
203
280
204
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
282
if(ret == -1){
206
perror("close");
283
perror_plus("close");
207
284
}
208
285
gpgme_data_release(pgp_data);
209
286
return true;
210
287
}
211
288
212
289
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
214
291
}
215
292
216
293
/* Init GPGME */
217
294
gpgme_check_version(NULL);
218
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
296
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
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));
222
299
return false;
223
300
}
224
301
225
/* Set GPGME home directory for the OpenPGP engine only */
302
/* Set GPGME home directory for the OpenPGP engine only */
226
303
rc = gpgme_get_engine_info(&engine_info);
227
304
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
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));
230
307
return false;
231
308
}
232
309
while(engine_info != NULL){
238
315
engine_info = engine_info->next;
239
316
}
240
317
if(engine_info == NULL){
241
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);
242
320
return false;
243
321
}
244
322
245
323
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
324
rc = gpgme_new(&(mc->ctx));
247
325
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
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));
250
329
return false;
251
330
}
252
331
263
342
*/
264
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
265
344
size_t crypto_size,
266
char **plaintext){
345
char **plaintext,
346
mandos_context *mc){
267
347
gpgme_data_t dh_crypto, dh_plain;
268
348
gpgme_error_t rc;
269
349
ssize_t ret;
271
351
ssize_t plaintext_length = 0;
272
352
273
353
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
354
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
275
355
}
276
356
277
357
/* Create new GPGME data buffer from memory cryptotext */
278
358
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
359
0);
280
360
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
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));
283
363
return -1;
284
364
}
285
365
286
366
/* Create new empty GPGME data buffer for the plaintext */
287
367
rc = gpgme_data_new(&dh_plain);
288
368
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
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));
291
372
gpgme_data_release(dh_crypto);
292
373
return -1;
293
374
}
294
375
295
376
/* Decrypt data from the cryptotext data buffer to the plaintext
296
377
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
298
379
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
380
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
301
382
plaintext_length = -1;
302
383
if(debug){
303
384
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
385
result = gpgme_op_decrypt_result(mc->ctx);
305
386
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
387
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
388
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
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);
312
393
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
394
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
395
}
315
396
gpgme_recipient_t recipient;
316
397
recipient = result->recipients;
317
398
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "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");
324
406
recipient = recipient->next;
325
407
}
326
408
}
329
411
}
330
412
331
413
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
333
415
}
334
416
335
417
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
418
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
419
perror_plus("gpgme_data_seek");
338
420
plaintext_length = -1;
339
421
goto decrypt_end;
340
422
}
342
424
*plaintext = NULL;
343
425
while(true){
344
426
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
427
(size_t)plaintext_length,
428
plaintext_capacity);
347
429
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
430
perror_plus("incbuffer");
431
plaintext_length = -1;
432
goto decrypt_end;
351
433
}
352
434
353
435
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
440
break;
359
441
}
360
442
if(ret < 0){
361
perror("gpgme_data_read");
443
perror_plus("gpgme_data_read");
362
444
plaintext_length = -1;
363
445
goto decrypt_end;
364
446
}
366
448
}
367
449
368
450
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
451
fprintf_plus(stderr, "Decrypted password is: ");
370
452
for(ssize_t i = 0; i < plaintext_length; i++){
371
453
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
454
}
384
466
}
385
467
386
468
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
469
const char *ret = gnutls_strerror(value);
389
470
if(ret == NULL)
390
471
ret = "(unknown)";
391
472
return ret;
394
475
/* GnuTLS log function callback */
395
476
static void debuggnutls(__attribute__((unused)) int level,
396
477
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
478
fprintf_plus(stderr, "GnuTLS: %s", string);
398
479
}
399
480
400
481
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
482
const char *seckeyfilename,
483
mandos_context *mc){
402
484
int ret;
403
485
404
486
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
487
fprintf_plus(stderr, "Initializing GnuTLS\n");
406
488
}
407
489
408
490
ret = gnutls_global_init();
409
491
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
492
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
493
safer_gnutls_strerror(ret));
412
494
return -1;
413
495
}
414
496
421
503
}
422
504
423
505
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
506
ret = gnutls_certificate_allocate_credentials(&mc->cred);
425
507
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
508
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
509
safer_gnutls_strerror(ret));
431
510
gnutls_global_deinit();
432
511
return -1;
433
512
}
434
513
435
514
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
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);
439
519
}
440
520
441
521
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
522
(mc->cred, pubkeyfilename, seckeyfilename,
443
523
GNUTLS_OPENPGP_FMT_BASE64);
444
524
if(ret != GNUTLS_E_SUCCESS){
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
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));
450
530
goto globalfail;
451
531
}
452
532
453
533
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
534
ret = gnutls_dh_params_init(&mc->dh_params);
455
535
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
536
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
537
" initialization: %s\n",
538
safer_gnutls_strerror(ret));
458
539
goto globalfail;
459
540
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
461
542
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
543
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
544
safer_gnutls_strerror(ret));
464
545
goto globalfail;
465
546
}
466
547
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
548
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
468
549
469
550
return 0;
470
551
471
552
globalfail:
472
553
473
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_certificate_free_credentials(mc->cred);
474
555
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
556
gnutls_dh_params_deinit(mc->dh_params);
476
557
return -1;
477
558
}
478
559
479
static int init_gnutls_session(gnutls_session_t *session){
560
static int init_gnutls_session(gnutls_session_t *session,
561
mandos_context *mc){
480
562
int ret;
481
563
/* GnuTLS session creation */
482
564
do {
486
568
}
487
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
570
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
491
574
}
492
575
493
576
{
494
577
const char *err;
495
578
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
579
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
497
580
if(quit_now){
498
581
gnutls_deinit(*session);
499
582
return -1;
500
583
}
501
584
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
585
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
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));
506
589
gnutls_deinit(*session);
507
590
return -1;
508
591
}
510
593
511
594
do {
512
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
596
mc->cred);
514
597
if(quit_now){
515
598
gnutls_deinit(*session);
516
599
return -1;
517
600
}
518
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
602
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
522
605
gnutls_deinit(*session);
523
606
return -1;
524
607
}
526
609
/* ignore client certificate if any. */
527
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
528
611
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
612
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
530
613
531
614
return 0;
532
615
}
536
619
__attribute__((unused)) const char *txt){}
537
620
538
621
/* Called when a Mandos server is found */
539
static int start_mandos_communication(const char *ip, uint16_t port,
622
static int start_mandos_communication(const char *ip, in_port_t port,
540
623
AvahiIfIndex if_index,
541
int af){
624
int af, mandos_context *mc){
542
625
int ret, tcp_sd = -1;
543
626
ssize_t sret;
544
627
union {
569
652
pf = PF_INET;
570
653
break;
571
654
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
573
656
errno = EINVAL;
574
657
return -1;
575
658
}
576
659
577
ret = init_gnutls_session(&session);
660
ret = init_gnutls_session(&session, mc);
578
661
if(ret != 0){
579
662
return -1;
580
663
}
581
664
582
665
if(debug){
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIuMAX "\n", ip, (uintmax_t)port);
585
668
}
586
669
587
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
671
if(tcp_sd < 0){
589
672
int e = errno;
590
perror("socket");
673
perror_plus("socket");
591
674
errno = e;
592
675
goto mandos_end;
593
676
}
607
690
}
608
691
if(ret < 0 ){
609
692
int e = errno;
610
perror("inet_pton");
693
perror_plus("inet_pton");
611
694
errno = e;
612
695
goto mandos_end;
613
696
}
614
697
if(ret == 0){
615
698
int e = errno;
616
fprintf(stderr, "Bad address: %s\n", ip);
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
617
700
errno = e;
618
701
goto mandos_end;
619
702
}
620
703
if(af == AF_INET6){
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
704
to.in6.sin6_port = htons(port);
625
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
707
-Wunreachable-code*/
628
708
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
709
fprintf_plus(stderr, "An IPv6 link-local address is"
710
" incomplete without a network interface\n");
631
711
errno = EINVAL;
632
712
goto mandos_end;
633
713
}
649
729
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
730
char interface[IF_NAMESIZE];
651
731
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
732
perror_plus("if_indextoname");
653
733
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
656
736
}
657
737
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
660
740
}
661
741
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
742
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
669
749
sizeof(addrstr));
670
750
}
671
751
if(pcret == NULL){
672
perror("inet_ntop");
752
perror_plus("inet_ntop");
673
753
} else {
674
754
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
676
756
}
677
757
}
678
758
}
688
768
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
769
}
690
770
if(ret < 0){
691
int e = errno;
692
perror("connect");
693
errno = e;
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
694
776
goto mandos_end;
695
777
}
696
778
704
786
while(true){
705
787
size_t out_size = strlen(out);
706
788
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
out_size - written));
789
out_size - written));
708
790
if(ret == -1){
709
791
int e = errno;
710
perror("write");
792
perror_plus("write");
711
793
errno = e;
712
794
goto mandos_end;
713
795
}
730
812
}
731
813
732
814
if(debug){
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
815
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
734
816
}
735
817
736
818
if(quit_now){
738
820
goto mandos_end;
739
821
}
740
822
741
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);
742
828
743
829
if(quit_now){
744
830
errno = EINTR;
755
841
756
842
if(ret != GNUTLS_E_SUCCESS){
757
843
if(debug){
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
844
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
759
845
gnutls_perror(ret);
760
846
}
761
847
errno = EPROTO;
765
851
/* Read OpenPGP packet that contains the wanted password */
766
852
767
853
if(debug){
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
854
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
855
" %s\n", ip);
770
856
}
771
857
772
858
while(true){
777
863
}
778
864
779
865
buffer_capacity = incbuffer(&buffer, buffer_length,
780
buffer_capacity);
866
buffer_capacity);
781
867
if(buffer_capacity == 0){
782
868
int e = errno;
783
perror("incbuffer");
869
perror_plus("incbuffer");
784
870
errno = e;
785
871
goto mandos_end;
786
872
}
810
896
}
811
897
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
898
if(ret < 0){
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
899
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
900
"***\n");
814
901
gnutls_perror(ret);
815
902
errno = EPROTO;
816
903
goto mandos_end;
817
904
}
818
905
break;
819
906
default:
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
907
fprintf_plus(stderr, "Unknown error while reading data from"
908
" encrypted session with Mandos server\n");
822
909
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
910
errno = EIO;
824
911
goto mandos_end;
829
916
}
830
917
831
918
if(debug){
832
fprintf(stderr, "Closing TLS session\n");
919
fprintf_plus(stderr, "Closing TLS session\n");
833
920
}
834
921
835
922
if(quit_now){
847
934
848
935
if(buffer_length > 0){
849
936
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
852
&decrypted_buffer);
937
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
938
&decrypted_buffer, mc);
853
939
if(decrypted_buffer_size >= 0){
854
940
855
941
written = 0;
865
951
if(ret == 0 and ferror(stdout)){
866
952
int e = errno;
867
953
if(debug){
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
954
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
955
strerror(errno));
870
956
}
871
957
errno = e;
872
958
goto mandos_end;
891
977
if(e == 0){
892
978
e = errno;
893
979
}
894
perror("close");
980
perror_plus("close");
895
981
}
896
982
gnutls_deinit(session);
983
errno = e;
897
984
if(quit_now){
898
e = EINTR;
985
errno = EINTR;
899
986
retval = -1;
900
987
}
901
errno = e;
902
988
}
903
989
return retval;
904
990
}
916
1002
AVAHI_GCC_UNUSED AvahiStringList *txt,
917
1003
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
1004
flags,
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(r);
1005
void* mc){
1006
if(r == NULL){
1007
return;
1008
}
921
1009
922
1010
/* Called whenever a service has been resolved successfully or
923
1011
timed out */
929
1017
switch(event){
930
1018
default:
931
1019
case AVAHI_RESOLVER_FAILURE:
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
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)));
935
1025
break;
936
1026
937
1027
case AVAHI_RESOLVER_FOUND:
939
1029
char ip[AVAHI_ADDRESS_STR_MAX];
940
1030
avahi_address_snprint(ip, sizeof(ip), address);
941
1031
if(debug){
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
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);
945
1035
}
946
int ret = start_mandos_communication(ip, port, interface,
947
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);
948
1040
if(ret == 0){
949
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
}
950
1049
}
951
1050
}
952
1051
}
962
1061
const char *domain,
963
1062
AVAHI_GCC_UNUSED AvahiLookupResultFlags
964
1063
flags,
965
AVAHI_GCC_UNUSED void* userdata){
966
assert(b);
1064
void* mc){
1065
if(b == NULL){
1066
return;
1067
}
967
1068
968
1069
/* Called whenever a new services becomes available on the LAN or
969
1070
is removed from the LAN */
976
1077
default:
977
1078
case AVAHI_BROWSER_FAILURE:
978
1079
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
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);
982
1084
return;
983
1085
984
1086
case AVAHI_BROWSER_NEW:
987
1089
the callback function is called the Avahi server will free the
988
1090
resolver for us. */
989
1091
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
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)));
995
1100
break;
996
1101
997
1102
case AVAHI_BROWSER_REMOVE:
1000
1105
case AVAHI_BROWSER_ALL_FOR_NOW:
1001
1106
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1002
1107
if(debug){
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1108
fprintf_plus(stderr, "No Mandos server found, still"
1109
" searching...\n");
1004
1110
}
1005
1111
break;
1006
1112
}
1007
1113
}
1008
1114
1009
/* stop main loop after sigterm has been called */
1115
/* Signal handler that stops main loop after SIGTERM */
1010
1116
static void handle_sigterm(int sig){
1011
1117
if(quit_now){
1012
1118
return;
1014
1120
quit_now = 1;
1015
1121
signal_received = sig;
1016
1122
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1123
/* set main loop to exit */
1124
if(simple_poll != NULL){
1125
avahi_simple_poll_quit(simple_poll);
1126
}
1127
errno = old_errno;
1128
}
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
1196
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int good_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
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)){
1678
break;
1679
}
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;
1021
1753
}
1022
1754
1023
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 };
1024
1759
AvahiSServiceBrowser *sb = NULL;
1025
int error;
1760
error_t ret_errno;
1026
1761
int ret;
1027
1762
intmax_t tmpmax;
1028
1763
char *tmp;
1029
1764
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
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;
1037
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1038
1770
bool tempdir_created = false;
1039
1771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1040
1772
const char *seckey = PATHDIR "/" SECKEY;
1041
1773
const char *pubkey = PATHDIR "/" PUBKEY;
1774
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1042
1776
1043
1777
bool gnutls_initialized = false;
1044
1778
bool gpgme_initialized = false;
1045
1779
float delay = 2.5f;
1780
double retry_interval = 10; /* 10s between trying a server and
1781
retrying the same server again */
1046
1782
1047
1783
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
1784
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1054
1790
errno = 0;
1055
1791
ret = setgid(gid);
1056
1792
if(ret == -1){
1057
perror("setgid");
1793
perror_plus("setgid");
1058
1794
}
1059
1795
1060
1796
/* Lower user privileges (temporarily) */
1061
1797
errno = 0;
1062
1798
ret = seteuid(uid);
1063
1799
if(ret == -1){
1064
perror("seteuid");
1800
perror_plus("seteuid");
1065
1801
}
1066
1802
1067
1803
if(quit_now){
1102
1838
.arg = "SECONDS",
1103
1839
.doc = "Maximum delay to wait for interface startup",
1104
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 },
1105
1849
/*
1106
1850
* These reproduce what we would get without ARGP_NO_HELP
1107
1851
*/
1125
1869
connect_to = arg;
1126
1870
break;
1127
1871
case 'i': /* --interface */
1128
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
}
1129
1877
break;
1130
1878
case 's': /* --seckey */
1131
1879
seckey = arg;
1151
1899
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
1900
argp_error(state, "Bad delay");
1153
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;
1154
1913
break;
1155
1914
/*
1156
1915
* These reproduce what we would get without ARGP_NO_HELP
1163
1922
argp_state_help(state, state->out_stream,
1164
1923
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
1924
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1925
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1167
1926
exit(argp_err_exit_status);
1168
1927
break;
1169
1928
default:
1184
1943
case ENOMEM:
1185
1944
default:
1186
1945
errno = ret;
1187
perror("argp_parse");
1946
perror_plus("argp_parse");
1188
1947
exitcode = EX_OSERR;
1189
1948
goto end;
1190
1949
case EINVAL:
1192
1951
goto end;
1193
1952
}
1194
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
}
1195
2049
1196
2050
if(not debug){
1197
2051
avahi_set_log_function(empty_log);
1201
2055
from the signal handler */
1202
2056
/* Initialize the pseudo-RNG for Avahi */
1203
2057
srand((unsigned int) time(NULL));
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
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");
1207
2062
exitcode = EX_UNAVAILABLE;
1208
2063
goto end;
1209
2064
}
1211
2066
sigemptyset(&sigterm_action.sa_mask);
1212
2067
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
2068
if(ret == -1){
1214
perror("sigaddset");
2069
perror_plus("sigaddset");
1215
2070
exitcode = EX_OSERR;
1216
2071
goto end;
1217
2072
}
1218
2073
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
2074
if(ret == -1){
1220
perror("sigaddset");
2075
perror_plus("sigaddset");
1221
2076
exitcode = EX_OSERR;
1222
2077
goto end;
1223
2078
}
1224
2079
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
2080
if(ret == -1){
1226
perror("sigaddset");
2081
perror_plus("sigaddset");
1227
2082
exitcode = EX_OSERR;
1228
2083
goto end;
1229
2084
}
1233
2088
*/
1234
2089
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
2090
if(ret == -1){
1236
perror("sigaction");
2091
perror_plus("sigaction");
1237
2092
return EX_OSERR;
1238
2093
}
1239
2094
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
2095
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
2096
if(ret == -1){
1242
perror("sigaction");
2097
perror_plus("sigaction");
1243
2098
exitcode = EX_OSERR;
1244
2099
goto end;
1245
2100
}
1246
2101
}
1247
2102
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
2103
if(ret == -1){
1249
perror("sigaction");
2104
perror_plus("sigaction");
1250
2105
return EX_OSERR;
1251
2106
}
1252
2107
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
2108
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
2109
if(ret == -1){
1255
perror("sigaction");
2110
perror_plus("sigaction");
1256
2111
exitcode = EX_OSERR;
1257
2112
goto end;
1258
2113
}
1259
2114
}
1260
2115
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
2116
if(ret == -1){
1262
perror("sigaction");
2117
perror_plus("sigaction");
1263
2118
return EX_OSERR;
1264
2119
}
1265
2120
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
2121
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
2122
if(ret == -1){
1268
perror("sigaction");
2123
perror_plus("sigaction");
1269
2124
exitcode = EX_OSERR;
1270
2125
goto end;
1271
2126
}
1272
2127
}
1273
2128
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
1359
}
1360
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
break;
1378
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
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);
1409
2150
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
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
}
1414
2184
}
1415
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
}
1416
2192
}
1417
2193
1418
2194
if(quit_now){
1419
2195
goto end;
1420
2196
}
1421
2197
1422
ret = init_gnutls_global(pubkey, seckey);
2198
ret = init_gnutls_global(pubkey, seckey, &mc);
1423
2199
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
2200
fprintf_plus(stderr, "init_gnutls_global failed\n");
1425
2201
exitcode = EX_UNAVAILABLE;
1426
2202
goto end;
1427
2203
} else {
1432
2208
goto end;
1433
2209
}
1434
2210
2211
if(mkdtemp(tempdir) == NULL){
2212
perror_plus("mkdtemp");
2213
goto end;
2214
}
1435
2215
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
1439
goto end;
1440
}
1441
2216
1442
2217
if(quit_now){
1443
2218
goto end;
1444
2219
}
1445
2220
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
2221
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2222
fprintf_plus(stderr, "init_gpgme failed\n");
1448
2223
exitcode = EX_UNAVAILABLE;
1449
2224
goto end;
1450
2225
} else {
1459
2234
/* Connect directly, do not use Zeroconf */
1460
2235
/* (Mainly meant for debugging) */
1461
2236
char *address = strrchr(connect_to, ':');
2237
1462
2238
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
2239
fprintf_plus(stderr, "No colon in address\n");
1464
2240
exitcode = EX_USAGE;
1465
2241
goto end;
1466
2242
}
1469
2245
goto end;
1470
2246
}
1471
2247
1472
uint16_t port;
2248
in_port_t port;
1473
2249
errno = 0;
1474
2250
tmpmax = strtoimax(address+1, &tmp, 10);
1475
2251
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2252
or tmpmax != (in_port_t)tmpmax){
2253
fprintf_plus(stderr, "Bad port number\n");
1478
2254
exitcode = EX_USAGE;
1479
2255
goto end;
1480
2256
}
1483
2259
goto end;
1484
2260
}
1485
2261
1486
port = (uint16_t)tmpmax;
2262
port = (in_port_t)tmpmax;
1487
2263
*address = '\0';
1488
address = connect_to;
1489
2264
/* Colon in address indicates IPv6 */
1490
2265
int af;
1491
if(strchr(address, ':') != NULL){
2266
if(strchr(connect_to, ':') != NULL){
1492
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
}
1493
2274
} else {
1494
2275
af = AF_INET;
1495
2276
}
2277
address = connect_to;
1496
2278
1497
2279
if(quit_now){
1498
2280
goto end;
1499
2281
}
1500
2282
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2283
while(not quit_now){
2284
ret = start_mandos_communication(address, port, if_index, af,
2285
&mc);
2286
if(quit_now or ret == 0){
2287
break;
2288
}
2289
if(debug){
2290
fprintf_plus(stderr, "Retrying in %d seconds\n",
2291
(int)retry_interval);
2292
}
2293
sleep((int)retry_interval);
2294
}
2295
2296
if (not quit_now){
1523
2297
exitcode = EXIT_SUCCESS;
1524
2298
}
2299
1525
2300
goto end;
1526
2301
}
1527
2302
1539
2314
config.publish_domain = 0;
1540
2315
1541
2316
/* Allocate a new server */
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
2317
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2318
&config, NULL, NULL, &ret_errno);
1545
2319
1546
2320
/* Free the Avahi configuration data */
1547
2321
avahi_server_config_free(&config);
1549
2323
1550
2324
/* Check if creating the Avahi server object succeeded */
1551
2325
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
2326
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2327
avahi_strerror(ret_errno));
1554
2328
exitcode = EX_UNAVAILABLE;
1555
2329
goto end;
1556
2330
}
1562
2336
/* Create the Avahi service browser */
1563
2337
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
2338
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
2339
NULL, 0, browse_callback,
2340
(void *)&mc);
1566
2341
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
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)));
1569
2344
exitcode = EX_UNAVAILABLE;
1570
2345
goto end;
1571
2346
}
1577
2352
/* Run the main loop */
1578
2353
1579
2354
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
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
}
1584
2364
1585
2365
end:
1586
2366
1587
2367
if(debug){
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2368
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1589
2369
}
1590
2370
1591
2371
/* Cleanup things */
1595
2375
if(mc.server != NULL)
1596
2376
avahi_server_free(mc.server);
1597
2377
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
2378
if(simple_poll != NULL)
2379
avahi_simple_poll_free(simple_poll);
1600
2380
1601
2381
if(gnutls_initialized){
1602
2382
gnutls_certificate_free_credentials(mc.cred);
1608
2388
gpgme_release(mc.ctx);
1609
2389
}
1610
2390
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
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;
1618
2399
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
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");
1628
2420
}
1629
2421
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2424
" down\n");
1639
2425
}
1640
2426
}
2427
2428
lower_privileges_permanently();
1641
2429
}
1642
2430
1643
/* 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 */
1644
2435
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
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];
1665
2443
char *fullname = NULL;
1666
2444
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
2445
direntry->d_name);
1668
2446
if(ret < 0){
1669
perror("asprintf");
2447
perror_plus("asprintf");
1670
2448
continue;
1671
2449
}
1672
2450
ret = remove(fullname);
1673
2451
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2452
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2453
strerror(errno));
1676
2454
}
1677
2455
free(fullname);
1678
2456
}
1679
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");
1680
2463
}
1681
2464
ret = rmdir(tempdir);
1682
2465
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
2466
perror_plus("rmdir");
1684
2467
}
1685
2468
}
1686
2469
1691
2474
&old_sigterm_action,
1692
2475
NULL));
1693
2476
if(ret == -1){
1694
perror("sigaction");
2477
perror_plus("sigaction");
1695
2478
}
1696
2479
do {
1697
2480
ret = raise(signal_received);
1698
2481
} while(ret != 0 and errno == EINTR);
1699
2482
if(ret != 0){
1700
perror("raise");
2483
perror_plus("raise");
1701
2484
abort();
1702
2485
}
1703
2486
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0