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- Committer: Teddy Hogeborn
- Date: 2014-03-29 05:16:37 UTC
- Revision ID: teddy@recompile.se-20140329051637-abjokbmd5aptbf5u
Minor changes to minimize diff from last release.
* plugins.d/mandos-client.c: Minor changes (mostly white space).
* plugins.d/mandos-client.c: Minor changes (mostly white space).
- files added:
- DBUS-API
- debian/source
- debian/upstream
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
82
83
#include <signal.h> /* sigemptyset(), sigaddset(),
83
84
sigaction(), SIGTERM, sig_atomic_t,
84
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
85
97
86
98
#ifdef __linux__
87
99
#include <sys/klog.h> /* klogctl() */
105
117
init_gnutls_session(),
106
118
GNUTLS_* */
107
119
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
110
122
111
123
/* GPGME */
112
124
#include <gpgme.h> /* All GPGME types, constants and
120
132
#define PATHDIR "/conf/conf.d/mandos"
121
133
#define SECKEY "seckey.txt"
122
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
136
124
137
bool debug = false;
125
138
static const char mandos_protocol_version[] = "1";
126
139
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
128
141
static const char sys_class_net[] = "/sys/class/net";
129
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
149
const char *ip;
150
in_port_t port;
151
AvahiIfIndex if_index;
152
int af;
153
struct timespec last_seen;
154
struct server *next;
155
struct server *prev;
156
} server;
130
157
131
158
/* Used for passing in values through the Avahi callback functions */
132
159
typedef struct {
133
AvahiSimplePoll *simple_poll;
134
160
AvahiServer *server;
135
161
gnutls_certificate_credentials_t cred;
136
162
unsigned int dh_bits;
137
163
gnutls_dh_params_t dh_params;
138
164
const char *priority;
139
165
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
140
169
} mandos_context;
141
170
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" };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
146
173
147
174
sig_atomic_t quit_now = 0;
148
175
int signal_received = 0;
149
176
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
150
196
/*
151
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
198
* bytes. "buffer_capacity" is how much is currently allocated,
153
199
* "buffer_length" is how much is already used.
154
200
*/
201
__attribute__((nonnull, warn_unused_result))
155
202
size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
203
size_t buffer_capacity){
157
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
160
211
return 0;
161
212
}
213
*buffer = new_buf;
162
214
buffer_capacity += BUFFER_SIZE;
163
215
}
164
216
return buffer_capacity;
165
217
}
166
218
219
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
223
int ret;
224
server *new_server = malloc(sizeof(server));
225
if(new_server == NULL){
226
perror_plus("malloc");
227
return false;
228
}
229
*new_server = (server){ .ip = strdup(ip),
230
.port = port,
231
.if_index = if_index,
232
.af = af };
233
if(new_server->ip == NULL){
234
perror_plus("strdup");
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
/* Special case of first server */
243
if(*current_server == NULL){
244
new_server->next = new_server;
245
new_server->prev = new_server;
246
*current_server = new_server;
247
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
251
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
255
}
256
167
257
/*
168
258
* Initialize GPGME.
169
259
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
172
265
gpgme_error_t rc;
173
266
gpgme_engine_info_t engine_info;
174
267
175
176
268
/*
177
269
* Helper function to insert pub and seckey to the engine keyring.
178
270
*/
179
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
180
272
int ret;
181
273
int fd;
182
274
gpgme_data_t pgp_data;
183
275
184
276
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
277
if(fd == -1){
186
perror("open");
278
perror_plus("open");
187
279
return false;
188
280
}
189
281
190
282
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
283
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));
284
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
194
286
return false;
195
287
}
196
288
197
rc = gpgme_op_import(mc.ctx, pgp_data);
289
rc = gpgme_op_import(mc->ctx, pgp_data);
198
290
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
201
293
return false;
202
294
}
203
295
204
296
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
297
if(ret == -1){
206
perror("close");
298
perror_plus("close");
207
299
}
208
300
gpgme_data_release(pgp_data);
209
301
return true;
210
302
}
211
303
212
304
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
305
fprintf_plus(stderr, "Initializing GPGME\n");
214
306
}
215
307
216
308
/* Init GPGME */
217
309
gpgme_check_version(NULL);
218
310
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
311
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
312
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
222
314
return false;
223
315
}
224
316
225
/* Set GPGME home directory for the OpenPGP engine only */
317
/* Set GPGME home directory for the OpenPGP engine only */
226
318
rc = gpgme_get_engine_info(&engine_info);
227
319
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
320
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
321
gpgme_strsource(rc), gpgme_strerror(rc));
230
322
return false;
231
323
}
232
324
while(engine_info != NULL){
238
330
engine_info = engine_info->next;
239
331
}
240
332
if(engine_info == NULL){
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
333
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
334
tempdir);
242
335
return false;
243
336
}
244
337
245
338
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
339
rc = gpgme_new(&(mc->ctx));
247
340
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
250
344
return false;
251
345
}
252
346
261
355
* Decrypt OpenPGP data.
262
356
* Returns -1 on error
263
357
*/
358
__attribute__((nonnull, warn_unused_result))
264
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
265
360
size_t crypto_size,
266
char **plaintext){
361
char **plaintext,
362
mandos_context *mc){
267
363
gpgme_data_t dh_crypto, dh_plain;
268
364
gpgme_error_t rc;
269
365
ssize_t ret;
271
367
ssize_t plaintext_length = 0;
272
368
273
369
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
370
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
275
371
}
276
372
277
373
/* Create new GPGME data buffer from memory cryptotext */
278
374
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
375
0);
280
376
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));
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
283
379
return -1;
284
380
}
285
381
286
382
/* Create new empty GPGME data buffer for the plaintext */
287
383
rc = gpgme_data_new(&dh_plain);
288
384
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
291
388
gpgme_data_release(dh_crypto);
292
389
return -1;
293
390
}
294
391
295
392
/* Decrypt data from the cryptotext data buffer to the plaintext
296
393
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
298
395
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
gpgme_strsource(rc), gpgme_strerror(rc));
301
398
plaintext_length = -1;
302
399
if(debug){
303
400
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
401
result = gpgme_op_decrypt_result(mc->ctx);
305
402
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
404
} 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);
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
312
409
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
411
}
315
412
gpgme_recipient_t recipient;
316
413
recipient = result->recipients;
317
414
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");
415
fprintf_plus(stderr, "Public key algorithm: %s\n",
416
gpgme_pubkey_algo_name
417
(recipient->pubkey_algo));
418
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
419
fprintf_plus(stderr, "Secret key available: %s\n",
420
recipient->status == GPG_ERR_NO_SECKEY
421
? "No" : "Yes");
324
422
recipient = recipient->next;
325
423
}
326
424
}
329
427
}
330
428
331
429
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
430
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
333
431
}
334
432
335
433
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
434
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
435
perror_plus("gpgme_data_seek");
338
436
plaintext_length = -1;
339
437
goto decrypt_end;
340
438
}
342
440
*plaintext = NULL;
343
441
while(true){
344
442
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
443
(size_t)plaintext_length,
444
plaintext_capacity);
347
445
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
446
perror_plus("incbuffer");
447
plaintext_length = -1;
448
goto decrypt_end;
351
449
}
352
450
353
451
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
456
break;
359
457
}
360
458
if(ret < 0){
361
perror("gpgme_data_read");
459
perror_plus("gpgme_data_read");
362
460
plaintext_length = -1;
363
461
goto decrypt_end;
364
462
}
366
464
}
367
465
368
466
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
467
fprintf_plus(stderr, "Decrypted password is: ");
370
468
for(ssize_t i = 0; i < plaintext_length; i++){
371
469
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
470
}
383
481
return plaintext_length;
384
482
}
385
483
386
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
389
487
if(ret == NULL)
390
488
ret = "(unknown)";
391
489
return ret;
392
490
}
393
491
394
492
/* GnuTLS log function callback */
493
__attribute__((nonnull))
395
494
static void debuggnutls(__attribute__((unused)) int level,
396
495
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
496
fprintf_plus(stderr, "GnuTLS: %s", string);
398
497
}
399
498
499
__attribute__((nonnull, warn_unused_result))
400
500
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
501
const char *seckeyfilename,
502
mandos_context *mc){
402
503
int ret;
403
504
404
505
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
506
fprintf_plus(stderr, "Initializing GnuTLS\n");
406
507
}
407
508
408
509
ret = gnutls_global_init();
409
510
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
412
513
return -1;
413
514
}
414
515
421
522
}
422
523
423
524
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
425
526
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));
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
safer_gnutls_strerror(ret));
431
529
gnutls_global_deinit();
432
530
return -1;
433
531
}
434
532
435
533
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
534
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
535
" secret key %s as GnuTLS credentials\n",
536
pubkeyfilename,
537
seckeyfilename);
439
538
}
440
539
441
540
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
541
(mc->cred, pubkeyfilename, seckeyfilename,
443
542
GNUTLS_OPENPGP_FMT_BASE64);
444
543
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));
544
fprintf_plus(stderr,
545
"Error[%d] while reading the OpenPGP key pair ('%s',"
546
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
547
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
548
safer_gnutls_strerror(ret));
450
549
goto globalfail;
451
550
}
452
551
453
552
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
455
554
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
" initialization: %s\n",
557
safer_gnutls_strerror(ret));
458
558
goto globalfail;
459
559
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
461
561
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
464
564
goto globalfail;
465
565
}
466
566
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
468
568
469
569
return 0;
470
570
471
571
globalfail:
472
572
473
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
474
574
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
476
576
return -1;
477
577
}
478
578
479
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
480
582
int ret;
481
583
/* GnuTLS session creation */
482
584
do {
486
588
}
487
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
590
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
591
fprintf_plus(stderr,
592
"Error in GnuTLS session initialization: %s\n",
593
safer_gnutls_strerror(ret));
491
594
}
492
595
493
596
{
494
597
const char *err;
495
598
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
497
600
if(quit_now){
498
601
gnutls_deinit(*session);
499
602
return -1;
500
603
}
501
604
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
605
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));
606
fprintf_plus(stderr, "Syntax error at: %s\n", err);
607
fprintf_plus(stderr, "GnuTLS error: %s\n",
608
safer_gnutls_strerror(ret));
506
609
gnutls_deinit(*session);
507
610
return -1;
508
611
}
510
613
511
614
do {
512
615
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
616
mc->cred);
514
617
if(quit_now){
515
618
gnutls_deinit(*session);
516
619
return -1;
517
620
}
518
621
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
622
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
623
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
624
safer_gnutls_strerror(ret));
522
625
gnutls_deinit(*session);
523
626
return -1;
524
627
}
526
629
/* ignore client certificate if any. */
527
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
528
631
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
530
633
531
634
return 0;
532
635
}
536
639
__attribute__((unused)) const char *txt){}
537
640
538
641
/* Called when a Mandos server is found */
539
static int start_mandos_communication(const char *ip, uint16_t port,
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
540
644
AvahiIfIndex if_index,
541
int af){
645
int af, mandos_context *mc){
542
646
int ret, tcp_sd = -1;
543
647
ssize_t sret;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
648
struct sockaddr_storage to;
548
649
char *buffer = NULL;
549
650
char *decrypted_buffer = NULL;
550
651
size_t buffer_length = 0;
554
655
gnutls_session_t session;
555
656
int pf; /* Protocol family */
556
657
658
errno = 0;
659
557
660
if(quit_now){
661
errno = EINTR;
558
662
return -1;
559
663
}
560
664
566
670
pf = PF_INET;
567
671
break;
568
672
default:
569
fprintf(stderr, "Bad address family: %d\n", af);
673
fprintf_plus(stderr, "Bad address family: %d\n", af);
674
errno = EINVAL;
570
675
return -1;
571
676
}
572
677
573
ret = init_gnutls_session(&session);
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
706
return -1;
707
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
574
711
if(ret != 0){
575
712
return -1;
576
713
}
577
714
578
715
if(debug){
579
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
580
"\n", ip, port);
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
581
718
}
582
719
583
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
584
721
if(tcp_sd < 0){
585
perror("socket");
722
int e = errno;
723
perror_plus("socket");
724
errno = e;
586
725
goto mandos_end;
587
726
}
588
727
589
728
if(quit_now){
729
errno = EINTR;
590
730
goto mandos_end;
591
731
}
592
732
593
733
memset(&to, 0, sizeof(to));
594
734
if(af == AF_INET6){
595
to.in6.sin6_family = (sa_family_t)af;
596
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
597
737
} else { /* IPv4 */
598
to.in.sin_family = (sa_family_t)af;
599
ret = inet_pton(af, ip, &to.in.sin_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
600
740
}
601
741
if(ret < 0 ){
602
perror("inet_pton");
742
int e = errno;
743
perror_plus("inet_pton");
744
errno = e;
603
745
goto mandos_end;
604
746
}
605
747
if(ret == 0){
606
fprintf(stderr, "Bad address: %s\n", ip);
748
int e = errno;
749
fprintf_plus(stderr, "Bad address: %s\n", ip);
750
errno = e;
607
751
goto mandos_end;
608
752
}
609
753
if(af == AF_INET6){
610
to.in6.sin6_port = htons(port); /* Spurious warnings from
611
-Wconversion and
612
-Wunreachable-code */
613
614
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
615
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
616
-Wunreachable-code*/
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
617
757
if(if_index == AVAHI_IF_UNSPEC){
618
fprintf(stderr, "An IPv6 link-local address is incomplete"
619
" without a network interface\n");
758
fprintf_plus(stderr, "An IPv6 link-local address is"
759
" incomplete without a network interface\n");
760
errno = EINVAL;
620
761
goto mandos_end;
621
762
}
622
763
/* Set the network interface number as scope */
623
to.in6.sin6_scope_id = (uint32_t)if_index;
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
624
765
}
625
766
} else {
626
to.in.sin_port = htons(port); /* Spurious warnings from
627
-Wconversion and
628
-Wunreachable-code */
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
629
768
}
630
769
631
770
if(quit_now){
771
errno = EINTR;
632
772
goto mandos_end;
633
773
}
634
774
636
776
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
637
777
char interface[IF_NAMESIZE];
638
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
639
perror("if_indextoname");
779
perror_plus("if_indextoname");
640
780
} else {
641
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
642
ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
643
783
}
644
784
} else {
645
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
646
port);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
647
787
}
648
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
649
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
650
const char *pcret;
651
790
if(af == AF_INET6){
652
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
653
sizeof(addrstr));
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
654
795
} else {
655
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
656
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
657
800
}
658
if(pcret == NULL){
659
perror("inet_ntop");
660
} else {
661
if(strcmp(addrstr, ip) != 0){
662
fprintf(stderr, "Canonical address form: %s\n", addrstr);
663
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
664
807
}
665
808
}
666
809
667
810
if(quit_now){
811
errno = EINTR;
668
812
goto mandos_end;
669
813
}
670
814
671
815
if(af == AF_INET6){
672
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
673
818
} else {
674
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
675
821
}
676
822
if(ret < 0){
677
perror("connect");
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
int e = errno;
825
perror_plus("connect");
826
errno = e;
827
}
678
828
goto mandos_end;
679
829
}
680
830
681
831
if(quit_now){
832
errno = EINTR;
682
833
goto mandos_end;
683
834
}
684
835
687
838
while(true){
688
839
size_t out_size = strlen(out);
689
840
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
690
out_size - written));
841
out_size - written));
691
842
if(ret == -1){
692
perror("write");
843
int e = errno;
844
perror_plus("write");
845
errno = e;
693
846
goto mandos_end;
694
847
}
695
848
written += (size_t)ret;
705
858
}
706
859
707
860
if(quit_now){
861
errno = EINTR;
708
862
goto mandos_end;
709
863
}
710
864
}
711
865
712
866
if(debug){
713
fprintf(stderr, "Establishing TLS session with %s\n", ip);
867
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
714
868
}
715
869
716
870
if(quit_now){
871
errno = EINTR;
717
872
goto mandos_end;
718
873
}
719
874
720
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
721
880
722
881
if(quit_now){
882
errno = EINTR;
723
883
goto mandos_end;
724
884
}
725
885
726
886
do {
727
887
ret = gnutls_handshake(session);
728
888
if(quit_now){
889
errno = EINTR;
729
890
goto mandos_end;
730
891
}
731
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
732
893
733
894
if(ret != GNUTLS_E_SUCCESS){
734
895
if(debug){
735
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
896
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
736
897
gnutls_perror(ret);
737
898
}
899
errno = EPROTO;
738
900
goto mandos_end;
739
901
}
740
902
741
903
/* Read OpenPGP packet that contains the wanted password */
742
904
743
905
if(debug){
744
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
745
ip);
906
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
907
" %s\n", ip);
746
908
}
747
909
748
910
while(true){
749
911
750
912
if(quit_now){
913
errno = EINTR;
751
914
goto mandos_end;
752
915
}
753
916
754
917
buffer_capacity = incbuffer(&buffer, buffer_length,
755
buffer_capacity);
918
buffer_capacity);
756
919
if(buffer_capacity == 0){
757
perror("incbuffer");
920
int e = errno;
921
perror_plus("incbuffer");
922
errno = e;
758
923
goto mandos_end;
759
924
}
760
925
761
926
if(quit_now){
927
errno = EINTR;
762
928
goto mandos_end;
763
929
}
764
930
777
943
ret = gnutls_handshake(session);
778
944
779
945
if(quit_now){
946
errno = EINTR;
780
947
goto mandos_end;
781
948
}
782
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
783
950
if(ret < 0){
784
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
951
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
952
"***\n");
785
953
gnutls_perror(ret);
954
errno = EPROTO;
786
955
goto mandos_end;
787
956
}
788
957
break;
789
958
default:
790
fprintf(stderr, "Unknown error while reading data from"
791
" encrypted session with Mandos server\n");
959
fprintf_plus(stderr, "Unknown error while reading data from"
960
" encrypted session with Mandos server\n");
792
961
gnutls_bye(session, GNUTLS_SHUT_RDWR);
962
errno = EIO;
793
963
goto mandos_end;
794
964
}
795
965
} else {
798
968
}
799
969
800
970
if(debug){
801
fprintf(stderr, "Closing TLS session\n");
971
fprintf_plus(stderr, "Closing TLS session\n");
802
972
}
803
973
804
974
if(quit_now){
975
errno = EINTR;
805
976
goto mandos_end;
806
977
}
807
978
808
979
do {
809
980
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
810
981
if(quit_now){
982
errno = EINTR;
811
983
goto mandos_end;
812
984
}
813
985
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
814
986
815
987
if(buffer_length > 0){
816
988
ssize_t decrypted_buffer_size;
817
decrypted_buffer_size = pgp_packet_decrypt(buffer,
818
buffer_length,
819
&decrypted_buffer);
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
820
991
if(decrypted_buffer_size >= 0){
821
992
822
993
written = 0;
823
994
while(written < (size_t) decrypted_buffer_size){
824
995
if(quit_now){
996
errno = EINTR;
825
997
goto mandos_end;
826
998
}
827
999
829
1001
(size_t)decrypted_buffer_size - written,
830
1002
stdout);
831
1003
if(ret == 0 and ferror(stdout)){
1004
int e = errno;
832
1005
if(debug){
833
fprintf(stderr, "Error writing encrypted data: %s\n",
834
strerror(errno));
1006
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1007
strerror(errno));
835
1008
}
1009
errno = e;
836
1010
goto mandos_end;
837
1011
}
838
1012
written += (size_t)ret;
844
1018
/* Shutdown procedure */
845
1019
846
1020
mandos_end:
847
free(decrypted_buffer);
848
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
1021
{
1022
int e = errno;
1023
free(decrypted_buffer);
1024
free(buffer);
1025
if(tcp_sd >= 0){
1026
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1027
}
1028
if(ret == -1){
1029
if(e == 0){
1030
e = errno;
1031
}
1032
perror_plus("close");
1033
}
1034
gnutls_deinit(session);
1035
errno = e;
1036
if(quit_now){
1037
errno = EINTR;
1038
retval = -1;
1039
}
858
1040
}
859
1041
return retval;
860
1042
}
861
1043
1044
__attribute__((nonnull))
862
1045
static void resolve_callback(AvahiSServiceResolver *r,
863
1046
AvahiIfIndex interface,
864
1047
AvahiProtocol proto,
872
1055
AVAHI_GCC_UNUSED AvahiStringList *txt,
873
1056
AVAHI_GCC_UNUSED AvahiLookupResultFlags
874
1057
flags,
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
877
1062
878
1063
/* Called whenever a service has been resolved successfully or
879
1064
timed out */
885
1070
switch(event){
886
1071
default:
887
1072
case AVAHI_RESOLVER_FAILURE:
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
891
1078
break;
892
1079
893
1080
case AVAHI_RESOLVER_FOUND:
895
1082
char ip[AVAHI_ADDRESS_STR_MAX];
896
1083
avahi_address_snprint(ip, sizeof(ip), address);
897
1084
if(debug){
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
1085
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
host_name, ip, (intmax_t)interface, port);
901
1088
}
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
904
1093
if(ret == 0){
905
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1095
} else {
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
" list\n", name);
1101
}
906
1102
}
907
1103
}
908
1104
}
918
1114
const char *domain,
919
1115
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
1116
flags,
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
923
1121
924
1122
/* Called whenever a new services becomes available on the LAN or
925
1123
is removed from the LAN */
932
1130
default:
933
1131
case AVAHI_BROWSER_FAILURE:
934
1132
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
938
1137
return;
939
1138
940
1139
case AVAHI_BROWSER_NEW:
943
1142
the callback function is called the Avahi server will free the
944
1143
resolver for us. */
945
1144
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
951
1153
break;
952
1154
953
1155
case AVAHI_BROWSER_REMOVE:
956
1158
case AVAHI_BROWSER_ALL_FOR_NOW:
957
1159
case AVAHI_BROWSER_CACHE_EXHAUSTED:
958
1160
if(debug){
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1161
fprintf_plus(stderr, "No Mandos server found, still"
1162
" searching...\n");
960
1163
}
961
1164
break;
962
1165
}
963
1166
}
964
1167
965
/* stop main loop after sigterm has been called */
1168
/* Signal handler that stops main loop after SIGTERM */
966
1169
static void handle_sigterm(int sig){
967
1170
if(quit_now){
968
1171
return;
970
1173
quit_now = 1;
971
1174
signal_received = sig;
972
1175
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
1176
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
975
1179
}
976
1180
errno = old_errno;
977
1181
}
978
1182
1183
__attribute__((nonnull, warn_unused_result))
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
int ret;
1186
error_t ret_errno;
1187
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
if(s < 0){
1190
ret_errno = errno;
1191
perror_plus("socket");
1192
errno = ret_errno;
1193
return false;
1194
}
1195
strcpy(ifr->ifr_name, ifname);
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
if(ret == -1){
1198
if(debug){
1199
ret_errno = errno;
1200
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1202
}
1203
return false;
1204
}
1205
return true;
1206
}
1207
1208
__attribute__((nonnull, warn_unused_result))
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1210
1211
/* Reject the loopback device */
1212
if(ifr->ifr_flags & IFF_LOOPBACK){
1213
if(debug){
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1215
ifname);
1216
}
1217
return false;
1218
}
1219
/* Accept point-to-point devices only if connect_to is specified */
1220
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1221
if(debug){
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1224
}
1225
return true;
1226
}
1227
/* Otherwise, reject non-broadcast-capable devices */
1228
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1232
}
1233
return false;
1234
}
1235
/* Reject non-ARP interfaces (including dummy interfaces) */
1236
if(ifr->ifr_flags & IFF_NOARP){
1237
if(debug){
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1239
ifname);
1240
}
1241
return false;
1242
}
1243
1244
/* Accept this device */
1245
if(debug){
1246
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1247
}
1248
return true;
1249
}
1250
979
1251
/*
980
1252
* This function determines if a directory entry in /sys/class/net
981
1253
* corresponds to an acceptable network device.
982
1254
* (This function is passed to scandir(3) as a filter function.)
983
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
984
1257
int good_interface(const struct dirent *if_entry){
985
ssize_t ssret;
986
char *flagname = NULL;
987
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
988
if_entry->d_name);
989
if(ret < 0){
990
perror("asprintf");
991
return 0;
992
}
993
1258
if(if_entry->d_name[0] == '.'){
994
1259
return 0;
995
1260
}
996
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
997
if(flags_fd == -1){
998
perror("open");
999
return 0;
1000
}
1001
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1002
/* read line from flags_fd */
1003
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1004
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1005
flagstring[(size_t)to_read] = '\0';
1006
if(flagstring == NULL){
1007
perror("malloc");
1008
close(flags_fd);
1009
return 0;
1010
}
1011
while(to_read > 0){
1012
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1013
(size_t)to_read));
1014
if(ssret == -1){
1015
perror("read");
1016
free(flagstring);
1017
close(flags_fd);
1018
return 0;
1019
}
1020
to_read -= ssret;
1021
if(ssret == 0){
1261
1262
struct ifreq ifr;
1263
if(not get_flags(if_entry->d_name, &ifr)){
1264
if(debug){
1265
fprintf_plus(stderr, "Failed to get flags for interface "
1266
"\"%s\"\n", if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1277
/*
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1312
int notdotentries(const struct dirent *direntry){
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1318
return 0;
1319
}
1320
return 1;
1321
}
1322
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
int runnable_hook(const struct dirent *direntry){
1326
int ret;
1327
size_t sret;
1328
struct stat st;
1329
1330
if((direntry->d_name)[0] == '\0'){
1331
/* Empty name? */
1332
return 0;
1333
}
1334
1335
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1336
"abcdefghijklmnopqrstuvwxyz"
1337
"0123456789"
1338
"_-");
1339
if((direntry->d_name)[sret] != '\0'){
1340
/* Contains non-allowed characters */
1341
if(debug){
1342
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1343
direntry->d_name);
1344
}
1345
return 0;
1346
}
1347
1348
char *fullname = NULL;
1349
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1350
if(ret < 0){
1351
perror_plus("asprintf");
1352
return 0;
1353
}
1354
1355
ret = stat(fullname, &st);
1356
if(ret == -1){
1357
if(debug){
1358
perror_plus("Could not stat hook");
1359
}
1360
return 0;
1361
}
1362
if(not (S_ISREG(st.st_mode))){
1363
/* Not a regular file */
1364
if(debug){
1365
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1366
direntry->d_name);
1367
}
1368
return 0;
1369
}
1370
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1371
/* Not executable */
1372
if(debug){
1373
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1374
direntry->d_name);
1375
}
1376
return 0;
1377
}
1378
if(debug){
1379
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1380
direntry->d_name);
1381
}
1382
return 1;
1383
}
1384
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1388
int ret;
1389
struct timespec now;
1390
struct timespec waited_time;
1391
intmax_t block_time;
1392
1393
while(true){
1394
if(mc->current_server == NULL){
1395
if(debug){
1396
fprintf_plus(stderr, "Wait until first server is found."
1397
" No timeout!\n");
1398
}
1399
ret = avahi_simple_poll_iterate(s, -1);
1400
} else {
1401
if(debug){
1402
fprintf_plus(stderr, "Check current_server if we should run"
1403
" it, or wait\n");
1404
}
1405
/* the current time */
1406
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1407
if(ret == -1){
1408
perror_plus("clock_gettime");
1409
return -1;
1410
}
1411
/* Calculating in ms how long time between now and server
1412
who we visted longest time ago. Now - last seen. */
1413
waited_time.tv_sec = (now.tv_sec
1414
- mc->current_server->last_seen.tv_sec);
1415
waited_time.tv_nsec = (now.tv_nsec
1416
- mc->current_server->last_seen.tv_nsec);
1417
/* total time is 10s/10,000ms.
1418
Converting to s from ms by dividing by 1,000,
1419
and ns to ms by dividing by 1,000,000. */
1420
block_time = ((retry_interval
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1423
1424
if(debug){
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1426
block_time);
1427
}
1428
1429
if(block_time <= 0){
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1434
if(ret == 0){
1435
avahi_simple_poll_quit(s);
1436
return 0;
1437
}
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1439
&mc->current_server->last_seen);
1440
if(ret == -1){
1441
perror_plus("clock_gettime");
1442
return -1;
1443
}
1444
mc->current_server = mc->current_server->next;
1445
block_time = 0; /* Call avahi to find new Mandos
1446
servers, but don't block */
1447
}
1448
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1450
}
1451
if(ret != 0){
1452
if(ret > 0 or errno != EINTR){
1453
return (ret != 1) ? ret : 0;
1454
}
1455
}
1456
}
1457
}
1458
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1517
const float delay){
1518
struct dirent **direntries;
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
alphasort);
1521
if(numhooks == -1){
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
1529
}
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
int devnull = open("/dev/null", O_RDONLY);
1534
for(int i = 0; i < numhooks; i++){
1535
direntry = direntries[i];
1536
char *fullname = NULL;
1537
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1538
if(ret < 0){
1539
perror_plus("asprintf");
1540
continue;
1541
}
1542
if(debug){
1543
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1544
direntry->d_name);
1545
}
1546
pid_t hook_pid = fork();
1547
if(hook_pid == 0){
1548
/* Child */
1549
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1553
}
1554
/* Set group */
1555
errno = 0;
1556
ret = setgid(0);
1557
if(ret == -1){
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Reset supplementary groups */
1562
errno = 0;
1563
ret = setgroups(0, NULL);
1564
if(ret == -1){
1565
perror_plus("setgroups");
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
if(ret == -1){
1585
perror_plus("setenv");
1586
_exit(EX_OSERR);
1587
}
1588
ret = setenv("DEVICE", interface, 1);
1589
if(ret == -1){
1590
perror_plus("setenv");
1591
_exit(EX_OSERR);
1592
}
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1594
if(ret == -1){
1595
perror_plus("setenv");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MODE", mode, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1605
if(ret == -1){
1606
perror_plus("asprintf");
1607
_exit(EX_OSERR);
1608
}
1609
ret = setenv("DELAY", delaystring, 1);
1610
if(ret == -1){
1611
free(delaystring);
1612
perror_plus("setenv");
1613
_exit(EX_OSERR);
1614
}
1615
free(delaystring);
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1618
if(ret == -1){
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
}
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1626
}
1627
} else {
1628
int status;
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1630
perror_plus("waitpid");
1631
free(fullname);
1632
continue;
1633
}
1634
if(WIFEXITED(status)){
1635
if(WEXITSTATUS(status) != 0){
1636
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1637
" with status %d\n", direntry->d_name,
1638
WEXITSTATUS(status));
1639
free(fullname);
1640
continue;
1641
}
1642
} else if(WIFSIGNALED(status)){
1643
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1644
" signal %d\n", direntry->d_name,
1645
WTERMSIG(status));
1646
free(fullname);
1647
continue;
1648
} else {
1649
fprintf_plus(stderr, "Warning: network hook \"%s\""
1650
" crashed\n", direntry->d_name);
1651
free(fullname);
1652
continue;
1653
}
1654
}
1655
free(fullname);
1656
if(debug){
1657
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1658
direntry->d_name);
1659
}
1660
}
1661
close(devnull);
1662
}
1663
}
1664
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
1669
int ret;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1672
if(if_index == 0){
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1674
errno = old_errno;
1675
return ENXIO;
1676
}
1677
1678
if(quit_now){
1679
errno = old_errno;
1680
return EINTR;
1681
}
1682
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1686
ret_errno = errno;
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1689
errno = old_errno;
1690
return ret_errno;
1691
}
1692
network.ifr_flags |= IFF_UP; /* set flag */
1693
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1695
if(sd == -1){
1696
ret_errno = errno;
1697
perror_plus("socket");
1698
errno = old_errno;
1699
return ret_errno;
1700
}
1701
1702
if(quit_now){
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
if(ret == -1){
1705
perror_plus("close");
1706
}
1707
errno = old_errno;
1708
return EINTR;
1709
}
1710
1711
if(debug){
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1713
interface);
1714
}
1715
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
if(ret_errno != 0){
1719
perror_plus("Failed to raise privileges");
1720
}
1721
1722
#ifdef __linux__
1723
int ret_linux;
1724
bool restore_loglevel = false;
1725
if(ret_errno == 0){
1726
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1727
messages about the network interface to mess up the prompt */
1728
ret_linux = klogctl(8, NULL, 5);
1729
if(ret_linux == -1){
1730
perror_plus("klogctl");
1731
} else {
1732
restore_loglevel = true;
1733
}
1734
}
1735
#endif /* __linux__ */
1736
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1737
ioctl_errno = errno;
1738
#ifdef __linux__
1739
if(restore_loglevel){
1740
ret_linux = klogctl(7, NULL, 0);
1741
if(ret_linux == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
1747
/* If raise_privileges() succeeded above */
1748
if(ret_errno == 0){
1749
/* Lower privileges */
1750
ret_errno = lower_privileges();
1751
if(ret_errno != 0){
1752
errno = ret_errno;
1753
perror_plus("Failed to lower privileges");
1754
}
1755
}
1756
1757
/* Close the socket */
1758
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1759
if(ret == -1){
1760
perror_plus("close");
1761
}
1762
1763
if(ret_setflags == -1){
1764
errno = ioctl_errno;
1765
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1766
errno = old_errno;
1767
return ioctl_errno;
1768
}
1769
} else if(debug){
1770
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1771
interface);
1772
}
1773
1774
/* Sleep checking until interface is running.
1775
Check every 0.25s, up to total time of delay */
1776
for(int i=0; i < delay * 4; i++){
1777
if(interface_is_running(interface)){
1022
1778
break;
1023
1779
}
1024
}
1025
close(flags_fd);
1026
intmax_t tmpmax;
1027
char *tmp;
1028
errno = 0;
1029
tmpmax = strtoimax(flagstring, &tmp, 0);
1030
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1031
and not (isspace(*tmp)))
1032
or tmpmax != (ifreq_flags)tmpmax){
1033
if(debug){
1034
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1035
flagstring, if_entry->d_name);
1036
}
1037
free(flagstring);
1038
return 0;
1039
}
1040
free(flagstring);
1041
ifreq_flags flags = (ifreq_flags)tmpmax;
1042
/* Reject the loopback device */
1043
if(flags & IFF_LOOPBACK){
1044
if(debug){
1045
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1046
if_entry->d_name);
1047
}
1048
return 0;
1049
}
1050
/* Accept point-to-point devices only if connect_to is specified */
1051
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1052
if(debug){
1053
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1054
if_entry->d_name);
1055
}
1056
return 1;
1057
}
1058
/* Otherwise, reject non-broadcast-capable devices */
1059
if(not (flags & IFF_BROADCAST)){
1060
if(debug){
1061
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1062
if_entry->d_name);
1063
}
1064
return 0;
1065
}
1066
/* Accept this device */
1067
if(debug){
1068
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1069
if_entry->d_name);
1070
}
1071
return 1;
1780
struct timespec sleeptime = { .tv_nsec = 250000000 };
1781
ret = nanosleep(&sleeptime, NULL);
1782
if(ret == -1 and errno != EINTR){
1783
perror_plus("nanosleep");
1784
}
1785
}
1786
1787
errno = old_errno;
1788
return 0;
1789
}
1790
1791
__attribute__((nonnull, warn_unused_result))
1792
error_t take_down_interface(const char *const interface){
1793
error_t old_errno = errno;
1794
struct ifreq network;
1795
unsigned int if_index = if_nametoindex(interface);
1796
if(if_index == 0){
1797
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1798
errno = old_errno;
1799
return ENXIO;
1800
}
1801
if(interface_is_up(interface)){
1802
error_t ret_errno = 0, ioctl_errno = 0;
1803
if(not get_flags(interface, &network) and debug){
1804
ret_errno = errno;
1805
fprintf_plus(stderr, "Failed to get flags for interface "
1806
"\"%s\"\n", interface);
1807
errno = old_errno;
1808
return ret_errno;
1809
}
1810
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1811
1812
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1813
if(sd == -1){
1814
ret_errno = errno;
1815
perror_plus("socket");
1816
errno = old_errno;
1817
return ret_errno;
1818
}
1819
1820
if(debug){
1821
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1822
interface);
1823
}
1824
1825
/* Raise privileges */
1826
ret_errno = raise_privileges();
1827
if(ret_errno != 0){
1828
perror_plus("Failed to raise privileges");
1829
}
1830
1831
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1832
ioctl_errno = errno;
1833
1834
/* If raise_privileges() succeeded above */
1835
if(ret_errno == 0){
1836
/* Lower privileges */
1837
ret_errno = lower_privileges();
1838
if(ret_errno != 0){
1839
errno = ret_errno;
1840
perror_plus("Failed to lower privileges");
1841
}
1842
}
1843
1844
/* Close the socket */
1845
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1849
1850
if(ret_setflags == -1){
1851
errno = ioctl_errno;
1852
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1853
errno = old_errno;
1854
return ioctl_errno;
1855
}
1856
} else if(debug){
1857
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1858
interface);
1859
}
1860
1861
errno = old_errno;
1862
return 0;
1072
1863
}
1073
1864
1074
1865
int main(int argc, char *argv[]){
1866
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1867
.priority = "SECURE256:!CTYPE-X.509:"
1868
"+CTYPE-OPENPGP", .current_server = NULL,
1869
.interfaces = NULL, .interfaces_size = 0 };
1075
1870
AvahiSServiceBrowser *sb = NULL;
1076
int error;
1871
error_t ret_errno;
1077
1872
int ret;
1078
1873
intmax_t tmpmax;
1079
1874
char *tmp;
1080
1875
int exitcode = EXIT_SUCCESS;
1081
const char *interface = "";
1082
struct ifreq network;
1083
int sd = -1;
1084
bool take_down_interface = false;
1085
uid_t uid;
1086
gid_t gid;
1087
char tempdir[] = "/tmp/mandosXXXXXX";
1088
bool tempdir_created = false;
1876
char *interfaces_to_take_down = NULL;
1877
size_t interfaces_to_take_down_size = 0;
1878
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1879
char old_tempdir[] = "/tmp/mandosXXXXXX";
1880
char *tempdir = NULL;
1089
1881
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1090
1882
const char *seckey = PATHDIR "/" SECKEY;
1091
1883
const char *pubkey = PATHDIR "/" PUBKEY;
1884
char *interfaces_hooks = NULL;
1092
1885
1093
1886
bool gnutls_initialized = false;
1094
1887
bool gpgme_initialized = false;
1095
1888
float delay = 2.5f;
1889
double retry_interval = 10; /* 10s between trying a server and
1890
retrying the same server again */
1096
1891
1097
1892
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1098
1893
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1104
1899
errno = 0;
1105
1900
ret = setgid(gid);
1106
1901
if(ret == -1){
1107
perror("setgid");
1902
perror_plus("setgid");
1108
1903
}
1109
1904
1110
1905
/* Lower user privileges (temporarily) */
1111
1906
errno = 0;
1112
1907
ret = seteuid(uid);
1113
1908
if(ret == -1){
1114
perror("seteuid");
1909
perror_plus("seteuid");
1115
1910
}
1116
1911
1117
1912
if(quit_now){
1152
1947
.arg = "SECONDS",
1153
1948
.doc = "Maximum delay to wait for interface startup",
1154
1949
.group = 2 },
1950
{ .name = "retry", .key = 132,
1951
.arg = "SECONDS",
1952
.doc = "Retry interval used when denied by the Mandos server",
1953
.group = 2 },
1954
{ .name = "network-hook-dir", .key = 133,
1955
.arg = "DIR",
1956
.doc = "Directory where network hooks are located",
1957
.group = 2 },
1958
/*
1959
* These reproduce what we would get without ARGP_NO_HELP
1960
*/
1961
{ .name = "help", .key = '?',
1962
.doc = "Give this help list", .group = -1 },
1963
{ .name = "usage", .key = -3,
1964
.doc = "Give a short usage message", .group = -1 },
1965
{ .name = "version", .key = 'V',
1966
.doc = "Print program version", .group = -1 },
1155
1967
{ .name = NULL }
1156
1968
};
1157
1969
1158
1970
error_t parse_opt(int key, char *arg,
1159
1971
struct argp_state *state){
1972
errno = 0;
1160
1973
switch(key){
1161
1974
case 128: /* --debug */
1162
1975
debug = true;
1165
1978
connect_to = arg;
1166
1979
break;
1167
1980
case 'i': /* --interface */
1168
interface = arg;
1981
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1982
arg, (int)',');
1983
if(ret_errno != 0){
1984
argp_error(state, "%s", strerror(ret_errno));
1985
}
1169
1986
break;
1170
1987
case 's': /* --seckey */
1171
1988
seckey = arg;
1178
1995
tmpmax = strtoimax(arg, &tmp, 10);
1179
1996
if(errno != 0 or tmp == arg or *tmp != '\0'
1180
1997
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1181
fprintf(stderr, "Bad number of DH bits\n");
1182
exit(EXIT_FAILURE);
1998
argp_error(state, "Bad number of DH bits");
1183
1999
}
1184
2000
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1185
2001
break;
1190
2006
errno = 0;
1191
2007
delay = strtof(arg, &tmp);
1192
2008
if(errno != 0 or tmp == arg or *tmp != '\0'){
1193
fprintf(stderr, "Bad delay\n");
1194
exit(EXIT_FAILURE);
1195
}
1196
break;
1197
case ARGP_KEY_ARG:
1198
argp_usage(state);
1199
case ARGP_KEY_END:
2009
argp_error(state, "Bad delay");
2010
}
2011
case 132: /* --retry */
2012
errno = 0;
2013
retry_interval = strtod(arg, &tmp);
2014
if(errno != 0 or tmp == arg or *tmp != '\0'
2015
or (retry_interval * 1000) > INT_MAX
2016
or retry_interval < 0){
2017
argp_error(state, "Bad retry interval");
2018
}
2019
break;
2020
case 133: /* --network-hook-dir */
2021
hookdir = arg;
2022
break;
2023
/*
2024
* These reproduce what we would get without ARGP_NO_HELP
2025
*/
2026
case '?': /* --help */
2027
argp_state_help(state, state->out_stream,
2028
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2029
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2030
case -3: /* --usage */
2031
argp_state_help(state, state->out_stream,
2032
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2033
case 'V': /* --version */
2034
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2035
exit(argp_err_exit_status);
1200
2036
break;
1201
2037
default:
1202
2038
return ARGP_ERR_UNKNOWN;
1203
2039
}
1204
return 0;
2040
return errno;
1205
2041
}
1206
2042
1207
2043
struct argp argp = { .options = options, .parser = parse_opt,
1208
2044
.args_doc = "",
1209
2045
.doc = "Mandos client -- Get and decrypt"
1210
2046
" passwords from a Mandos server" };
1211
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1212
if(ret == ARGP_ERR_UNKNOWN){
1213
fprintf(stderr, "Unknown error while parsing arguments\n");
1214
exitcode = EXIT_FAILURE;
1215
goto end;
1216
}
2047
ret = argp_parse(&argp, argc, argv,
2048
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2049
switch(ret){
2050
case 0:
2051
break;
2052
case ENOMEM:
2053
default:
2054
errno = ret;
2055
perror_plus("argp_parse");
2056
exitcode = EX_OSERR;
2057
goto end;
2058
case EINVAL:
2059
exitcode = EX_USAGE;
2060
goto end;
2061
}
2062
}
2063
2064
{
2065
/* Work around Debian bug #633582:
2066
<http://bugs.debian.org/633582> */
2067
2068
/* Re-raise privileges */
2069
ret_errno = raise_privileges();
2070
if(ret_errno != 0){
2071
errno = ret_errno;
2072
perror_plus("Failed to raise privileges");
2073
} else {
2074
struct stat st;
2075
2076
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2077
int seckey_fd = open(seckey, O_RDONLY);
2078
if(seckey_fd == -1){
2079
perror_plus("open");
2080
} else {
2081
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2082
if(ret == -1){
2083
perror_plus("fstat");
2084
} else {
2085
if(S_ISREG(st.st_mode)
2086
and st.st_uid == 0 and st.st_gid == 0){
2087
ret = fchown(seckey_fd, uid, gid);
2088
if(ret == -1){
2089
perror_plus("fchown");
2090
}
2091
}
2092
}
2093
TEMP_FAILURE_RETRY(close(seckey_fd));
2094
}
2095
}
2096
2097
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2098
int pubkey_fd = open(pubkey, O_RDONLY);
2099
if(pubkey_fd == -1){
2100
perror_plus("open");
2101
} else {
2102
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2103
if(ret == -1){
2104
perror_plus("fstat");
2105
} else {
2106
if(S_ISREG(st.st_mode)
2107
and st.st_uid == 0 and st.st_gid == 0){
2108
ret = fchown(pubkey_fd, uid, gid);
2109
if(ret == -1){
2110
perror_plus("fchown");
2111
}
2112
}
2113
}
2114
TEMP_FAILURE_RETRY(close(pubkey_fd));
2115
}
2116
}
2117
2118
/* Lower privileges */
2119
ret_errno = lower_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2122
perror_plus("Failed to lower privileges");
2123
}
2124
}
2125
}
2126
2127
/* Remove invalid interface names (except "none") */
2128
{
2129
char *interface = NULL;
2130
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2131
interface))){
2132
if(strcmp(interface, "none") != 0
2133
and if_nametoindex(interface) == 0){
2134
if(interface[0] != '\0'){
2135
fprintf_plus(stderr, "Not using nonexisting interface"
2136
" \"%s\"\n", interface);
2137
}
2138
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2139
interface = NULL;
2140
}
2141
}
2142
}
2143
2144
/* Run network hooks */
2145
{
2146
if(mc.interfaces != NULL){
2147
interfaces_hooks = malloc(mc.interfaces_size);
2148
if(interfaces_hooks == NULL){
2149
perror_plus("malloc");
2150
goto end;
2151
}
2152
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2153
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2154
}
2155
run_network_hooks("start", interfaces_hooks != NULL ?
2156
interfaces_hooks : "", delay);
1217
2157
}
1218
2158
1219
2159
if(not debug){
1220
2160
avahi_set_log_function(empty_log);
1221
2161
}
1222
1223
if(interface[0] == '\0'){
1224
struct dirent **direntries;
1225
ret = scandir(sys_class_net, &direntries, good_interface,
1226
alphasort);
1227
if(ret >= 1){
1228
/* Pick the first good interface */
1229
interface = strdup(direntries[0]->d_name);
1230
if(debug){
1231
fprintf(stderr, "Using interface \"%s\"\n", interface);
1232
}
1233
if(interface == NULL){
1234
perror("malloc");
1235
free(direntries);
1236
exitcode = EXIT_FAILURE;
1237
goto end;
1238
}
1239
free(direntries);
1240
} else {
1241
free(direntries);
1242
fprintf(stderr, "Could not find a network interface\n");
1243
exitcode = EXIT_FAILURE;
1244
goto end;
1245
}
1246
}
1247
2162
1248
2163
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1249
2164
from the signal handler */
1250
2165
/* Initialize the pseudo-RNG for Avahi */
1251
2166
srand((unsigned int) time(NULL));
1252
mc.simple_poll = avahi_simple_poll_new();
1253
if(mc.simple_poll == NULL){
1254
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1255
exitcode = EXIT_FAILURE;
2167
simple_poll = avahi_simple_poll_new();
2168
if(simple_poll == NULL){
2169
fprintf_plus(stderr,
2170
"Avahi: Failed to create simple poll object.\n");
2171
exitcode = EX_UNAVAILABLE;
1256
2172
goto end;
1257
2173
}
1258
2174
1259
2175
sigemptyset(&sigterm_action.sa_mask);
1260
2176
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1261
2177
if(ret == -1){
1262
perror("sigaddset");
1263
exitcode = EXIT_FAILURE;
2178
perror_plus("sigaddset");
2179
exitcode = EX_OSERR;
1264
2180
goto end;
1265
2181
}
1266
2182
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1267
2183
if(ret == -1){
1268
perror("sigaddset");
1269
exitcode = EXIT_FAILURE;
2184
perror_plus("sigaddset");
2185
exitcode = EX_OSERR;
1270
2186
goto end;
1271
2187
}
1272
2188
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1273
2189
if(ret == -1){
1274
perror("sigaddset");
1275
exitcode = EXIT_FAILURE;
2190
perror_plus("sigaddset");
2191
exitcode = EX_OSERR;
1276
2192
goto end;
1277
2193
}
1278
2194
/* Need to check if the handler is SIG_IGN before handling:
1281
2197
*/
1282
2198
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1283
2199
if(ret == -1){
1284
perror("sigaction");
1285
return EXIT_FAILURE;
2200
perror_plus("sigaction");
2201
return EX_OSERR;
1286
2202
}
1287
2203
if(old_sigterm_action.sa_handler != SIG_IGN){
1288
2204
ret = sigaction(SIGINT, &sigterm_action, NULL);
1289
2205
if(ret == -1){
1290
perror("sigaction");
1291
exitcode = EXIT_FAILURE;
2206
perror_plus("sigaction");
2207
exitcode = EX_OSERR;
1292
2208
goto end;
1293
2209
}
1294
2210
}
1295
2211
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1296
2212
if(ret == -1){
1297
perror("sigaction");
1298
return EXIT_FAILURE;
2213
perror_plus("sigaction");
2214
return EX_OSERR;
1299
2215
}
1300
2216
if(old_sigterm_action.sa_handler != SIG_IGN){
1301
2217
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1302
2218
if(ret == -1){
1303
perror("sigaction");
1304
exitcode = EXIT_FAILURE;
2219
perror_plus("sigaction");
2220
exitcode = EX_OSERR;
1305
2221
goto end;
1306
2222
}
1307
2223
}
1308
2224
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1309
2225
if(ret == -1){
1310
perror("sigaction");
1311
return EXIT_FAILURE;
2226
perror_plus("sigaction");
2227
return EX_OSERR;
1312
2228
}
1313
2229
if(old_sigterm_action.sa_handler != SIG_IGN){
1314
2230
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1315
2231
if(ret == -1){
1316
perror("sigaction");
1317
exitcode = EXIT_FAILURE;
1318
goto end;
1319
}
1320
}
1321
1322
/* If the interface is down, bring it up */
1323
if(strcmp(interface, "none") != 0){
1324
if_index = (AvahiIfIndex) if_nametoindex(interface);
1325
if(if_index == 0){
1326
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1327
exitcode = EXIT_FAILURE;
1328
goto end;
1329
}
1330
1331
if(quit_now){
1332
goto end;
1333
}
1334
1335
/* Re-raise priviliges */
1336
errno = 0;
1337
ret = seteuid(0);
1338
if(ret == -1){
1339
perror("seteuid");
1340
}
1341
1342
#ifdef __linux__
1343
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1344
messages to mess up the prompt */
1345
ret = klogctl(8, NULL, 5);
1346
bool restore_loglevel = true;
1347
if(ret == -1){
1348
restore_loglevel = false;
1349
perror("klogctl");
1350
}
1351
#endif /* __linux__ */
1352
1353
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1354
if(sd < 0){
1355
perror("socket");
1356
exitcode = EXIT_FAILURE;
1357
#ifdef __linux__
1358
if(restore_loglevel){
1359
ret = klogctl(7, NULL, 0);
1360
if(ret == -1){
1361
perror("klogctl");
1362
}
1363
}
1364
#endif /* __linux__ */
1365
/* Lower privileges */
1366
errno = 0;
1367
ret = seteuid(uid);
1368
if(ret == -1){
1369
perror("seteuid");
1370
}
1371
goto end;
1372
}
1373
strcpy(network.ifr_name, interface);
1374
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1375
if(ret == -1){
1376
perror("ioctl SIOCGIFFLAGS");
1377
#ifdef __linux__
1378
if(restore_loglevel){
1379
ret = klogctl(7, NULL, 0);
1380
if(ret == -1){
1381
perror("klogctl");
1382
}
1383
}
1384
#endif /* __linux__ */
1385
exitcode = EXIT_FAILURE;
1386
/* Lower privileges */
1387
errno = 0;
1388
ret = seteuid(uid);
1389
if(ret == -1){
1390
perror("seteuid");
1391
}
1392
goto end;
1393
}
1394
if((network.ifr_flags & IFF_UP) == 0){
1395
network.ifr_flags |= IFF_UP;
1396
take_down_interface = true;
1397
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1398
if(ret == -1){
1399
take_down_interface = false;
1400
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1401
exitcode = EXIT_FAILURE;
1402
#ifdef __linux__
1403
if(restore_loglevel){
1404
ret = klogctl(7, NULL, 0);
1405
if(ret == -1){
1406
perror("klogctl");
2232
perror_plus("sigaction");
2233
exitcode = EX_OSERR;
2234
goto end;
2235
}
2236
}
2237
2238
/* If no interfaces were specified, make a list */
2239
if(mc.interfaces == NULL){
2240
struct dirent **direntries;
2241
/* Look for any good interfaces */
2242
ret = scandir(sys_class_net, &direntries, good_interface,
2243
alphasort);
2244
if(ret >= 1){
2245
/* Add all found interfaces to interfaces list */
2246
for(int i = 0; i < ret; ++i){
2247
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2248
direntries[i]->d_name);
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("argz_add");
2252
continue;
2253
}
2254
if(debug){
2255
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2256
direntries[i]->d_name);
2257
}
2258
}
2259
free(direntries);
2260
} else {
2261
free(direntries);
2262
fprintf_plus(stderr, "Could not find a network interface\n");
2263
exitcode = EXIT_FAILURE;
2264
goto end;
2265
}
2266
}
2267
2268
/* Bring up interfaces which are down, and remove any "none"s */
2269
{
2270
char *interface = NULL;
2271
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2272
interface))){
2273
/* If interface name is "none", stop bringing up interfaces.
2274
Also remove all instances of "none" from the list */
2275
if(strcmp(interface, "none") == 0){
2276
argz_delete(&mc.interfaces, &mc.interfaces_size,
2277
interface);
2278
interface = NULL;
2279
while((interface = argz_next(mc.interfaces,
2280
mc.interfaces_size, interface))){
2281
if(strcmp(interface, "none") == 0){
2282
argz_delete(&mc.interfaces, &mc.interfaces_size,
2283
interface);
2284
interface = NULL;
1407
2285
}
1408
2286
}
1409
#endif /* __linux__ */
1410
/* Lower privileges */
1411
errno = 0;
1412
ret = seteuid(uid);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
goto end;
1417
}
1418
}
1419
/* sleep checking until interface is running */
1420
for(int i=0; i < delay * 4; i++){
1421
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1422
if(ret == -1){
1423
perror("ioctl SIOCGIFFLAGS");
1424
} else if(network.ifr_flags & IFF_RUNNING){
1425
2287
break;
1426
2288
}
1427
struct timespec sleeptime = { .tv_nsec = 250000000 };
1428
ret = nanosleep(&sleeptime, NULL);
1429
if(ret == -1 and errno != EINTR){
1430
perror("nanosleep");
1431
}
1432
}
1433
if(not take_down_interface){
1434
/* We won't need the socket anymore */
1435
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1436
if(ret == -1){
1437
perror("close");
1438
}
1439
}
1440
#ifdef __linux__
1441
if(restore_loglevel){
1442
/* Restores kernel loglevel to default */
1443
ret = klogctl(7, NULL, 0);
1444
if(ret == -1){
1445
perror("klogctl");
1446
}
1447
}
1448
#endif /* __linux__ */
1449
/* Lower privileges */
1450
errno = 0;
1451
if(take_down_interface){
1452
/* Lower privileges */
1453
ret = seteuid(uid);
1454
if(ret == -1){
1455
perror("seteuid");
1456
}
1457
} else {
1458
/* Lower privileges permanently */
1459
ret = setuid(uid);
1460
if(ret == -1){
1461
perror("setuid");
1462
}
1463
}
2289
bool interface_was_up = interface_is_up(interface);
2290
errno = bring_up_interface(interface, delay);
2291
if(not interface_was_up){
2292
if(errno != 0){
2293
perror_plus("Failed to bring up interface");
2294
} else {
2295
errno = argz_add(&interfaces_to_take_down,
2296
&interfaces_to_take_down_size,
2297
interface);
2298
if(errno != 0){
2299
perror_plus("argz_add");
2300
}
2301
}
2302
}
2303
}
2304
if(debug and (interfaces_to_take_down == NULL)){
2305
fprintf_plus(stderr, "No interfaces were brought up\n");
2306
}
2307
}
2308
2309
/* If we only got one interface, explicitly use only that one */
2310
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2311
if(debug){
2312
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2313
mc.interfaces);
2314
}
2315
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1464
2316
}
1465
2317
1466
2318
if(quit_now){
1467
2319
goto end;
1468
2320
}
1469
2321
1470
ret = init_gnutls_global(pubkey, seckey);
2322
ret = init_gnutls_global(pubkey, seckey, &mc);
1471
2323
if(ret == -1){
1472
fprintf(stderr, "init_gnutls_global failed\n");
1473
exitcode = EXIT_FAILURE;
2324
fprintf_plus(stderr, "init_gnutls_global failed\n");
2325
exitcode = EX_UNAVAILABLE;
1474
2326
goto end;
1475
2327
} else {
1476
2328
gnutls_initialized = true;
1480
2332
goto end;
1481
2333
}
1482
2334
1483
tempdir_created = true;
1484
if(mkdtemp(tempdir) == NULL){
1485
tempdir_created = false;
1486
perror("mkdtemp");
2335
/* Try /run/tmp before /tmp */
2336
tempdir = mkdtemp(run_tempdir);
2337
if(tempdir == NULL and errno == ENOENT){
2338
if(debug){
2339
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2340
run_tempdir, old_tempdir);
2341
}
2342
tempdir = mkdtemp(old_tempdir);
2343
}
2344
if(tempdir == NULL){
2345
perror_plus("mkdtemp");
1487
2346
goto end;
1488
2347
}
1489
2348
1491
2350
goto end;
1492
2351
}
1493
2352
1494
if(not init_gpgme(pubkey, seckey, tempdir)){
1495
fprintf(stderr, "init_gpgme failed\n");
1496
exitcode = EXIT_FAILURE;
2353
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2354
fprintf_plus(stderr, "init_gpgme failed\n");
2355
exitcode = EX_UNAVAILABLE;
1497
2356
goto end;
1498
2357
} else {
1499
2358
gpgme_initialized = true;
1507
2366
/* Connect directly, do not use Zeroconf */
1508
2367
/* (Mainly meant for debugging) */
1509
2368
char *address = strrchr(connect_to, ':');
2369
1510
2370
if(address == NULL){
1511
fprintf(stderr, "No colon in address\n");
1512
exitcode = EXIT_FAILURE;
2371
fprintf_plus(stderr, "No colon in address\n");
2372
exitcode = EX_USAGE;
1513
2373
goto end;
1514
2374
}
1515
2375
1517
2377
goto end;
1518
2378
}
1519
2379
1520
uint16_t port;
2380
in_port_t port;
1521
2381
errno = 0;
1522
2382
tmpmax = strtoimax(address+1, &tmp, 10);
1523
2383
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1524
or tmpmax != (uint16_t)tmpmax){
1525
fprintf(stderr, "Bad port number\n");
1526
exitcode = EXIT_FAILURE;
2384
or tmpmax != (in_port_t)tmpmax){
2385
fprintf_plus(stderr, "Bad port number\n");
2386
exitcode = EX_USAGE;
1527
2387
goto end;
1528
2388
}
1529
2389
1530
2390
if(quit_now){
1531
2391
goto end;
1532
2392
}
1533
2393
1534
port = (uint16_t)tmpmax;
2394
port = (in_port_t)tmpmax;
1535
2395
*address = '\0';
1536
address = connect_to;
1537
2396
/* Colon in address indicates IPv6 */
1538
2397
int af;
1539
if(strchr(address, ':') != NULL){
2398
if(strchr(connect_to, ':') != NULL){
1540
2399
af = AF_INET6;
2400
/* Accept [] around IPv6 address - see RFC 5952 */
2401
if(connect_to[0] == '[' and address[-1] == ']')
2402
{
2403
connect_to++;
2404
address[-1] = '\0';
2405
}
1541
2406
} else {
1542
2407
af = AF_INET;
1543
2408
}
2409
address = connect_to;
1544
2410
1545
2411
if(quit_now){
1546
2412
goto end;
1547
2413
}
1548
2414
1549
ret = start_mandos_communication(address, port, if_index, af);
1550
if(ret < 0){
1551
exitcode = EXIT_FAILURE;
1552
} else {
2415
while(not quit_now){
2416
ret = start_mandos_communication(address, port, if_index, af,
2417
&mc);
2418
if(quit_now or ret == 0){
2419
break;
2420
}
2421
if(debug){
2422
fprintf_plus(stderr, "Retrying in %d seconds\n",
2423
(int)retry_interval);
2424
}
2425
sleep((unsigned int)retry_interval);
2426
}
2427
2428
if(not quit_now){
1553
2429
exitcode = EXIT_SUCCESS;
1554
2430
}
2431
1555
2432
goto end;
1556
2433
}
1557
2434
1569
2446
config.publish_domain = 0;
1570
2447
1571
2448
/* Allocate a new server */
1572
mc.server = avahi_server_new(avahi_simple_poll_get
1573
(mc.simple_poll), &config, NULL,
1574
NULL, &error);
2449
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2450
&config, NULL, NULL, &ret_errno);
1575
2451
1576
2452
/* Free the Avahi configuration data */
1577
2453
avahi_server_config_free(&config);
1579
2455
1580
2456
/* Check if creating the Avahi server object succeeded */
1581
2457
if(mc.server == NULL){
1582
fprintf(stderr, "Failed to create Avahi server: %s\n",
1583
avahi_strerror(error));
1584
exitcode = EXIT_FAILURE;
2458
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2459
avahi_strerror(ret_errno));
2460
exitcode = EX_UNAVAILABLE;
1585
2461
goto end;
1586
2462
}
1587
2463
1592
2468
/* Create the Avahi service browser */
1593
2469
sb = avahi_s_service_browser_new(mc.server, if_index,
1594
2470
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1595
NULL, 0, browse_callback, NULL);
2471
NULL, 0, browse_callback,
2472
(void *)&mc);
1596
2473
if(sb == NULL){
1597
fprintf(stderr, "Failed to create service browser: %s\n",
1598
avahi_strerror(avahi_server_errno(mc.server)));
1599
exitcode = EXIT_FAILURE;
2474
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2475
avahi_strerror(avahi_server_errno(mc.server)));
2476
exitcode = EX_UNAVAILABLE;
1600
2477
goto end;
1601
2478
}
1602
2479
1607
2484
/* Run the main loop */
1608
2485
1609
2486
if(debug){
1610
fprintf(stderr, "Starting Avahi loop search\n");
1611
}
1612
1613
avahi_simple_poll_loop(mc.simple_poll);
2487
fprintf_plus(stderr, "Starting Avahi loop search\n");
2488
}
2489
2490
ret = avahi_loop_with_timeout(simple_poll,
2491
(int)(retry_interval * 1000), &mc);
2492
if(debug){
2493
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2494
(ret == 0) ? "successfully" : "with error");
2495
}
1614
2496
1615
2497
end:
1616
2498
1617
2499
if(debug){
1618
fprintf(stderr, "%s exiting\n", argv[0]);
2500
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1619
2501
}
1620
2502
1621
2503
/* Cleanup things */
2504
free(mc.interfaces);
2505
1622
2506
if(sb != NULL)
1623
2507
avahi_s_service_browser_free(sb);
1624
2508
1625
2509
if(mc.server != NULL)
1626
2510
avahi_server_free(mc.server);
1627
2511
1628
if(mc.simple_poll != NULL)
1629
avahi_simple_poll_free(mc.simple_poll);
2512
if(simple_poll != NULL)
2513
avahi_simple_poll_free(simple_poll);
1630
2514
1631
2515
if(gnutls_initialized){
1632
2516
gnutls_certificate_free_credentials(mc.cred);
1638
2522
gpgme_release(mc.ctx);
1639
2523
}
1640
2524
1641
/* Take down the network interface */
1642
if(take_down_interface){
1643
/* Re-raise priviliges */
1644
errno = 0;
1645
ret = seteuid(0);
1646
if(ret == -1){
1647
perror("seteuid");
1648
}
1649
if(geteuid() == 0){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_UP) {
1654
network.ifr_flags &= ~IFF_UP; /* clear flag */
1655
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1656
if(ret == -1){
1657
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1658
}
1659
}
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1661
if(ret == -1){
1662
perror("close");
1663
}
1664
/* Lower privileges permanently */
1665
errno = 0;
1666
ret = setuid(uid);
1667
if(ret == -1){
1668
perror("setuid");
1669
}
2525
/* Cleans up the circular linked list of Mandos servers the client
2526
has seen */
2527
if(mc.current_server != NULL){
2528
mc.current_server->prev->next = NULL;
2529
while(mc.current_server != NULL){
2530
server *next = mc.current_server->next;
2531
free(mc.current_server);
2532
mc.current_server = next;
1670
2533
}
1671
2534
}
1672
2535
1673
/* Removes the temp directory used by GPGME */
1674
if(tempdir_created){
1675
DIR *d;
1676
struct dirent *direntry;
1677
d = opendir(tempdir);
1678
if(d == NULL){
1679
if(errno != ENOENT){
1680
perror("opendir");
1681
}
2536
/* Re-raise privileges */
2537
{
2538
ret_errno = raise_privileges();
2539
if(ret_errno != 0){
2540
perror_plus("Failed to raise privileges");
1682
2541
} else {
1683
while(true){
1684
direntry = readdir(d);
1685
if(direntry == NULL){
1686
break;
1687
}
1688
/* Skip "." and ".." */
1689
if(direntry->d_name[0] == '.'
1690
and (direntry->d_name[1] == '\0'
1691
or (direntry->d_name[1] == '.'
1692
and direntry->d_name[2] == '\0'))){
1693
continue;
1694
}
2542
2543
/* Run network hooks */
2544
run_network_hooks("stop", interfaces_hooks != NULL ?
2545
interfaces_hooks : "", delay);
2546
2547
/* Take down the network interfaces which were brought up */
2548
{
2549
char *interface = NULL;
2550
while((interface=argz_next(interfaces_to_take_down,
2551
interfaces_to_take_down_size,
2552
interface))){
2553
ret_errno = take_down_interface(interface);
2554
if(ret_errno != 0){
2555
errno = ret_errno;
2556
perror_plus("Failed to take down interface");
2557
}
2558
}
2559
if(debug and (interfaces_to_take_down == NULL)){
2560
fprintf_plus(stderr, "No interfaces needed to be taken"
2561
" down\n");
2562
}
2563
}
2564
}
2565
2566
ret_errno = lower_privileges_permanently();
2567
if(ret_errno != 0){
2568
perror_plus("Failed to lower privileges permanently");
2569
}
2570
}
2571
2572
free(interfaces_to_take_down);
2573
free(interfaces_hooks);
2574
2575
/* Removes the GPGME temp directory and all files inside */
2576
if(tempdir != NULL){
2577
struct dirent **direntries = NULL;
2578
struct dirent *direntry = NULL;
2579
int numentries = scandir(tempdir, &direntries, notdotentries,
2580
alphasort);
2581
if(numentries > 0){
2582
for(int i = 0; i < numentries; i++){
2583
direntry = direntries[i];
1695
2584
char *fullname = NULL;
1696
2585
ret = asprintf(&fullname, "%s/%s", tempdir,
1697
2586
direntry->d_name);
1698
2587
if(ret < 0){
1699
perror("asprintf");
2588
perror_plus("asprintf");
1700
2589
continue;
1701
2590
}
1702
2591
ret = remove(fullname);
1703
2592
if(ret == -1){
1704
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1705
strerror(errno));
2593
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2594
strerror(errno));
1706
2595
}
1707
2596
free(fullname);
1708
2597
}
1709
closedir(d);
2598
}
2599
2600
/* need to clean even if 0 because man page doesn't specify */
2601
free(direntries);
2602
if(numentries == -1){
2603
perror_plus("scandir");
1710
2604
}
1711
2605
ret = rmdir(tempdir);
1712
2606
if(ret == -1 and errno != ENOENT){
1713
perror("rmdir");
2607
perror_plus("rmdir");
1714
2608
}
1715
2609
}
1716
2610
1721
2615
&old_sigterm_action,
1722
2616
NULL));
1723
2617
if(ret == -1){
1724
perror("sigaction");
2618
perror_plus("sigaction");
1725
2619
}
1726
2620
do {
1727
2621
ret = raise(signal_received);
1728
2622
} while(ret != 0 and errno == EINTR);
1729
2623
if(ret != 0){
1730
perror("raise");
2624
perror_plus("raise");
1731
2625
abort();
1732
2626
}
1733
2627
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0