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- Committer: Teddy Hogeborn
- Date: 2009-09-17 03:21:20 UTC
- Revision ID: teddy@fukt.bsnet.se-20090917032120-b4svwsceox2vx38q
* plugins.d/mandos-client.c (start_mandos_communication): Bug fix:
always free
"decrypted_buffer".
Default to
fail unless
success is
achieved.
always free
"decrypted_buffer".
Default to
fail unless
success is
achieved.
- files removed:
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
83
sigaction(), SIGTERM, sig_atomic_t,
85
84
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() */
97
85
98
86
#ifdef __linux__
99
87
#include <sys/klog.h> /* klogctl() */
117
105
init_gnutls_session(),
118
106
GNUTLS_* */
119
107
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
122
110
123
111
/* GPGME */
124
112
#include <gpgme.h> /* All GPGME types, constants and
132
120
#define PATHDIR "/conf/conf.d/mandos"
133
121
#define SECKEY "seckey.txt"
134
122
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
123
137
124
bool debug = false;
138
125
static const char mandos_protocol_version[] = "1";
139
const char * argp_program_version = "mandos-client " VERSION;
140
const char * argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
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;
126
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
157
128
158
129
/* Used for passing in values through the Avahi callback functions */
159
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
160
132
AvahiServer *server;
161
133
gnutls_certificate_credentials_t cred;
162
134
unsigned int dh_bits;
163
135
gnutls_dh_params_t dh_params;
164
136
const char *priority;
165
137
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
138
} mandos_context;
170
139
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
144
174
145
sig_atomic_t quit_now = 0;
175
146
int signal_received = 0;
176
147
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
196
148
/*
197
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
150
* bytes. "buffer_capacity" is how much is currently allocated,
199
151
* "buffer_length" is how much is already used.
200
152
*/
201
__attribute__((nonnull, warn_unused_result))
202
153
size_t incbuffer(char **buffer, size_t buffer_length,
203
size_t buffer_capacity){
154
size_t buffer_capacity){
204
155
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
157
if(buffer == NULL){
211
158
return 0;
212
159
}
213
*buffer = new_buf;
214
160
buffer_capacity += BUFFER_SIZE;
215
161
}
216
162
return buffer_capacity;
217
163
}
218
164
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
257
165
/*
258
166
* Initialize GPGME.
259
167
*/
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){
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
265
170
gpgme_error_t rc;
266
171
gpgme_engine_info_t engine_info;
267
172
173
268
174
/*
269
175
* Helper function to insert pub and seckey to the engine keyring.
270
176
*/
271
bool import_key(const char * const filename){
177
bool import_key(const char *filename){
272
178
int ret;
273
179
int fd;
274
180
gpgme_data_t pgp_data;
275
181
276
182
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
277
183
if(fd == -1){
278
perror_plus("open");
184
perror("open");
279
185
return false;
280
186
}
281
187
282
188
rc = gpgme_data_new_from_fd(&pgp_data, fd);
283
189
if(rc != GPG_ERR_NO_ERROR){
284
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
286
192
return false;
287
193
}
288
194
289
rc = gpgme_op_import(mc->ctx, pgp_data);
195
rc = gpgme_op_import(mc.ctx, pgp_data);
290
196
if(rc != GPG_ERR_NO_ERROR){
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
293
199
return false;
294
200
}
295
201
296
202
ret = (int)TEMP_FAILURE_RETRY(close(fd));
297
203
if(ret == -1){
298
perror_plus("close");
204
perror("close");
299
205
}
300
206
gpgme_data_release(pgp_data);
301
207
return true;
302
208
}
303
209
304
210
if(debug){
305
fprintf_plus(stderr, "Initializing GPGME\n");
211
fprintf(stderr, "Initializing GPGME\n");
306
212
}
307
213
308
214
/* Init GPGME */
309
215
gpgme_check_version(NULL);
310
216
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
311
217
if(rc != GPG_ERR_NO_ERROR){
312
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
314
220
return false;
315
221
}
316
222
317
/* Set GPGME home directory for the OpenPGP engine only */
223
/* Set GPGME home directory for the OpenPGP engine only */
318
224
rc = gpgme_get_engine_info(&engine_info);
319
225
if(rc != GPG_ERR_NO_ERROR){
320
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
321
gpgme_strsource(rc), gpgme_strerror(rc));
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
322
228
return false;
323
229
}
324
230
while(engine_info != NULL){
330
236
engine_info = engine_info->next;
331
237
}
332
238
if(engine_info == NULL){
333
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
334
tempdir);
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
335
240
return false;
336
241
}
337
242
338
243
/* Create new GPGME "context" */
339
rc = gpgme_new(&(mc->ctx));
244
rc = gpgme_new(&(mc.ctx));
340
245
if(rc != GPG_ERR_NO_ERROR){
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
344
248
return false;
345
249
}
346
250
355
259
* Decrypt OpenPGP data.
356
260
* Returns -1 on error
357
261
*/
358
__attribute__((nonnull, warn_unused_result))
359
262
static ssize_t pgp_packet_decrypt(const char *cryptotext,
360
263
size_t crypto_size,
361
char **plaintext,
362
mandos_context *mc){
264
char **plaintext){
363
265
gpgme_data_t dh_crypto, dh_plain;
364
266
gpgme_error_t rc;
365
267
ssize_t ret;
367
269
ssize_t plaintext_length = 0;
368
270
369
271
if(debug){
370
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
371
273
}
372
274
373
275
/* Create new GPGME data buffer from memory cryptotext */
374
276
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
375
277
0);
376
278
if(rc != GPG_ERR_NO_ERROR){
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
379
281
return -1;
380
282
}
381
283
382
284
/* Create new empty GPGME data buffer for the plaintext */
383
285
rc = gpgme_data_new(&dh_plain);
384
286
if(rc != GPG_ERR_NO_ERROR){
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
388
289
gpgme_data_release(dh_crypto);
389
290
return -1;
390
291
}
391
292
392
293
/* Decrypt data from the cryptotext data buffer to the plaintext
393
294
data buffer */
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
296
if(rc != GPG_ERR_NO_ERROR){
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
398
299
plaintext_length = -1;
399
300
if(debug){
400
301
gpgme_decrypt_result_t result;
401
result = gpgme_op_decrypt_result(mc->ctx);
302
result = gpgme_op_decrypt_result(mc.ctx);
402
303
if(result == NULL){
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
404
305
} else {
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);
306
fprintf(stderr, "Unsupported algorithm: %s\n",
307
result->unsupported_algorithm);
308
fprintf(stderr, "Wrong key usage: %u\n",
309
result->wrong_key_usage);
409
310
if(result->file_name != NULL){
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
311
fprintf(stderr, "File name: %s\n", result->file_name);
411
312
}
412
313
gpgme_recipient_t recipient;
413
314
recipient = result->recipients;
414
315
while(recipient != NULL){
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");
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
422
322
recipient = recipient->next;
423
323
}
424
324
}
427
327
}
428
328
429
329
if(debug){
430
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
431
331
}
432
332
433
333
/* Seek back to the beginning of the GPGME plaintext data buffer */
434
334
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
435
perror_plus("gpgme_data_seek");
335
perror("gpgme_data_seek");
436
336
plaintext_length = -1;
437
337
goto decrypt_end;
438
338
}
440
340
*plaintext = NULL;
441
341
while(true){
442
342
plaintext_capacity = incbuffer(plaintext,
443
(size_t)plaintext_length,
444
plaintext_capacity);
343
(size_t)plaintext_length,
344
plaintext_capacity);
445
345
if(plaintext_capacity == 0){
446
perror_plus("incbuffer");
447
plaintext_length = -1;
448
goto decrypt_end;
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
449
349
}
450
350
451
351
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
456
356
break;
457
357
}
458
358
if(ret < 0){
459
perror_plus("gpgme_data_read");
359
perror("gpgme_data_read");
460
360
plaintext_length = -1;
461
361
goto decrypt_end;
462
362
}
464
364
}
465
365
466
366
if(debug){
467
fprintf_plus(stderr, "Decrypted password is: ");
367
fprintf(stderr, "Decrypted password is: ");
468
368
for(ssize_t i = 0; i < plaintext_length; i++){
469
369
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
470
370
}
481
381
return plaintext_length;
482
382
}
483
383
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
384
static const char * safer_gnutls_strerror(int value){
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
386
-Wunreachable-code */
487
387
if(ret == NULL)
488
388
ret = "(unknown)";
489
389
return ret;
490
390
}
491
391
492
392
/* GnuTLS log function callback */
493
__attribute__((nonnull))
494
393
static void debuggnutls(__attribute__((unused)) int level,
495
394
const char* string){
496
fprintf_plus(stderr, "GnuTLS: %s", string);
395
fprintf(stderr, "GnuTLS: %s", string);
497
396
}
498
397
499
__attribute__((nonnull, warn_unused_result))
500
398
static int init_gnutls_global(const char *pubkeyfilename,
501
const char *seckeyfilename,
502
mandos_context *mc){
399
const char *seckeyfilename){
503
400
int ret;
504
401
505
402
if(debug){
506
fprintf_plus(stderr, "Initializing GnuTLS\n");
403
fprintf(stderr, "Initializing GnuTLS\n");
507
404
}
508
405
509
406
ret = gnutls_global_init();
510
407
if(ret != GNUTLS_E_SUCCESS){
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
513
410
return -1;
514
411
}
515
412
522
419
}
523
420
524
421
/* OpenPGP credentials */
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
422
gnutls_certificate_allocate_credentials(&mc.cred);
526
423
if(ret != GNUTLS_E_SUCCESS){
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
safer_gnutls_strerror(ret));
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
529
429
gnutls_global_deinit();
530
430
return -1;
531
431
}
532
432
533
433
if(debug){
534
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
535
" secret key %s as GnuTLS credentials\n",
536
pubkeyfilename,
537
seckeyfilename);
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
538
437
}
539
438
540
439
ret = gnutls_certificate_set_openpgp_key_file
541
(mc->cred, pubkeyfilename, seckeyfilename,
440
(mc.cred, pubkeyfilename, seckeyfilename,
542
441
GNUTLS_OPENPGP_FMT_BASE64);
543
442
if(ret != GNUTLS_E_SUCCESS){
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));
443
fprintf(stderr,
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
fprintf(stderr, "The GnuTLS error is: %s\n",
447
safer_gnutls_strerror(ret));
549
448
goto globalfail;
550
449
}
551
450
552
451
/* GnuTLS server initialization */
553
ret = gnutls_dh_params_init(&mc->dh_params);
452
ret = gnutls_dh_params_init(&mc.dh_params);
554
453
if(ret != GNUTLS_E_SUCCESS){
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
" initialization: %s\n",
557
safer_gnutls_strerror(ret));
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
558
456
goto globalfail;
559
457
}
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
459
if(ret != GNUTLS_E_SUCCESS){
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
564
462
goto globalfail;
565
463
}
566
464
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
466
569
467
return 0;
570
468
571
469
globalfail:
572
470
573
gnutls_certificate_free_credentials(mc->cred);
471
gnutls_certificate_free_credentials(mc.cred);
574
472
gnutls_global_deinit();
575
gnutls_dh_params_deinit(mc->dh_params);
473
gnutls_dh_params_deinit(mc.dh_params);
576
474
return -1;
577
475
}
578
476
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
477
static int init_gnutls_session(gnutls_session_t *session){
582
478
int ret;
583
479
/* GnuTLS session creation */
584
480
do {
588
484
}
589
485
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
486
if(ret != GNUTLS_E_SUCCESS){
591
fprintf_plus(stderr,
592
"Error in GnuTLS session initialization: %s\n",
593
safer_gnutls_strerror(ret));
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
594
489
}
595
490
596
491
{
597
492
const char *err;
598
493
do {
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
495
if(quit_now){
601
496
gnutls_deinit(*session);
602
497
return -1;
603
498
}
604
499
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
605
500
if(ret != GNUTLS_E_SUCCESS){
606
fprintf_plus(stderr, "Syntax error at: %s\n", err);
607
fprintf_plus(stderr, "GnuTLS error: %s\n",
608
safer_gnutls_strerror(ret));
501
fprintf(stderr, "Syntax error at: %s\n", err);
502
fprintf(stderr, "GnuTLS error: %s\n",
503
safer_gnutls_strerror(ret));
609
504
gnutls_deinit(*session);
610
505
return -1;
611
506
}
613
508
614
509
do {
615
510
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
616
mc->cred);
511
mc.cred);
617
512
if(quit_now){
618
513
gnutls_deinit(*session);
619
514
return -1;
620
515
}
621
516
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
622
517
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
624
safer_gnutls_strerror(ret));
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
625
520
gnutls_deinit(*session);
626
521
return -1;
627
522
}
629
524
/* ignore client certificate if any. */
630
525
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
631
526
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
528
634
529
return 0;
635
530
}
639
534
__attribute__((unused)) const char *txt){}
640
535
641
536
/* Called when a Mandos server is found */
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
537
static int start_mandos_communication(const char *ip, uint16_t port,
644
538
AvahiIfIndex if_index,
645
int af, mandos_context *mc){
539
int af){
646
540
int ret, tcp_sd = -1;
647
541
ssize_t sret;
648
struct sockaddr_storage to;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
649
546
char *buffer = NULL;
650
547
char *decrypted_buffer = NULL;
651
548
size_t buffer_length = 0;
655
552
gnutls_session_t session;
656
553
int pf; /* Protocol family */
657
554
658
errno = 0;
659
660
555
if(quit_now){
661
errno = EINTR;
662
556
return -1;
663
557
}
664
558
670
564
pf = PF_INET;
671
565
break;
672
566
default:
673
fprintf_plus(stderr, "Bad address family: %d\n", af);
674
errno = EINVAL;
567
fprintf(stderr, "Bad address family: %d\n", af);
675
568
return -1;
676
569
}
677
570
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);
571
ret = init_gnutls_session(&session);
711
572
if(ret != 0){
712
573
return -1;
713
574
}
714
575
715
576
if(debug){
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
718
579
}
719
580
720
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
721
582
if(tcp_sd < 0){
722
int e = errno;
723
perror_plus("socket");
724
errno = e;
583
perror("socket");
725
584
goto mandos_end;
726
585
}
727
586
728
587
if(quit_now){
729
errno = EINTR;
730
588
goto mandos_end;
731
589
}
732
590
733
591
memset(&to, 0, sizeof(to));
734
592
if(af == AF_INET6){
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
593
to.in6.sin6_family = (sa_family_t)af;
594
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
595
} else { /* IPv4 */
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
596
to.in.sin_family = (sa_family_t)af;
597
ret = inet_pton(af, ip, &to.in.sin_addr);
740
598
}
741
599
if(ret < 0 ){
742
int e = errno;
743
perror_plus("inet_pton");
744
errno = e;
600
perror("inet_pton");
745
601
goto mandos_end;
746
602
}
747
603
if(ret == 0){
748
int e = errno;
749
fprintf_plus(stderr, "Bad address: %s\n", ip);
750
errno = e;
604
fprintf(stderr, "Bad address: %s\n", ip);
751
605
goto mandos_end;
752
606
}
753
607
if(af == AF_INET6){
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
-Wconversion and
610
-Wunreachable-code */
611
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
757
615
if(if_index == AVAHI_IF_UNSPEC){
758
fprintf_plus(stderr, "An IPv6 link-local address is"
759
" incomplete without a network interface\n");
760
errno = EINVAL;
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
761
618
goto mandos_end;
762
619
}
763
620
/* Set the network interface number as scope */
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
621
to.in6.sin6_scope_id = (uint32_t)if_index;
765
622
}
766
623
} else {
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
624
to.in.sin_port = htons(port); /* Spurious warnings from
625
-Wconversion and
626
-Wunreachable-code */
768
627
}
769
628
770
629
if(quit_now){
771
errno = EINTR;
772
630
goto mandos_end;
773
631
}
774
632
776
634
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
777
635
char interface[IF_NAMESIZE];
778
636
if(if_indextoname((unsigned int)if_index, interface) == NULL){
779
perror_plus("if_indextoname");
637
perror("if_indextoname");
780
638
} else {
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
783
641
}
784
642
} else {
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
787
645
}
788
646
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
789
647
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
648
const char *pcret;
790
649
if(af == AF_INET6){
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
650
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
651
sizeof(addrstr));
795
652
} else {
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
653
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
654
sizeof(addrstr));
800
655
}
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);
656
if(pcret == NULL){
657
perror("inet_ntop");
658
} else {
659
if(strcmp(addrstr, ip) != 0){
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
661
}
807
662
}
808
663
}
809
664
810
665
if(quit_now){
811
errno = EINTR;
812
666
goto mandos_end;
813
667
}
814
668
815
669
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
670
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
671
} else {
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
673
}
822
674
if(ret < 0){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
int e = errno;
825
perror_plus("connect");
826
errno = e;
827
}
675
perror("connect");
828
676
goto mandos_end;
829
677
}
830
678
831
679
if(quit_now){
832
errno = EINTR;
833
680
goto mandos_end;
834
681
}
835
682
838
685
while(true){
839
686
size_t out_size = strlen(out);
840
687
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
841
out_size - written));
688
out_size - written));
842
689
if(ret == -1){
843
int e = errno;
844
perror_plus("write");
845
errno = e;
690
perror("write");
846
691
goto mandos_end;
847
692
}
848
693
written += (size_t)ret;
858
703
}
859
704
860
705
if(quit_now){
861
errno = EINTR;
862
706
goto mandos_end;
863
707
}
864
708
}
865
709
866
710
if(debug){
867
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
868
712
}
869
713
870
714
if(quit_now){
871
errno = EINTR;
872
715
goto mandos_end;
873
716
}
874
717
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);
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
880
719
881
720
if(quit_now){
882
errno = EINTR;
883
721
goto mandos_end;
884
722
}
885
723
886
724
do {
887
725
ret = gnutls_handshake(session);
888
726
if(quit_now){
889
errno = EINTR;
890
727
goto mandos_end;
891
728
}
892
729
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
893
730
894
731
if(ret != GNUTLS_E_SUCCESS){
895
732
if(debug){
896
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
897
734
gnutls_perror(ret);
898
735
}
899
errno = EPROTO;
900
736
goto mandos_end;
901
737
}
902
738
903
739
/* Read OpenPGP packet that contains the wanted password */
904
740
905
741
if(debug){
906
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
907
" %s\n", ip);
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
908
744
}
909
745
910
746
while(true){
911
747
912
748
if(quit_now){
913
errno = EINTR;
914
749
goto mandos_end;
915
750
}
916
751
917
752
buffer_capacity = incbuffer(&buffer, buffer_length,
918
buffer_capacity);
753
buffer_capacity);
919
754
if(buffer_capacity == 0){
920
int e = errno;
921
perror_plus("incbuffer");
922
errno = e;
755
perror("incbuffer");
923
756
goto mandos_end;
924
757
}
925
758
926
759
if(quit_now){
927
errno = EINTR;
928
760
goto mandos_end;
929
761
}
930
762
943
775
ret = gnutls_handshake(session);
944
776
945
777
if(quit_now){
946
errno = EINTR;
947
778
goto mandos_end;
948
779
}
949
780
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
950
781
if(ret < 0){
951
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
952
"***\n");
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
953
783
gnutls_perror(ret);
954
errno = EPROTO;
955
784
goto mandos_end;
956
785
}
957
786
break;
958
787
default:
959
fprintf_plus(stderr, "Unknown error while reading data from"
960
" encrypted session with Mandos server\n");
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
961
790
gnutls_bye(session, GNUTLS_SHUT_RDWR);
962
errno = EIO;
963
791
goto mandos_end;
964
792
}
965
793
} else {
968
796
}
969
797
970
798
if(debug){
971
fprintf_plus(stderr, "Closing TLS session\n");
799
fprintf(stderr, "Closing TLS session\n");
972
800
}
973
801
974
802
if(quit_now){
975
errno = EINTR;
976
803
goto mandos_end;
977
804
}
978
805
979
806
do {
980
807
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
981
808
if(quit_now){
982
errno = EINTR;
983
809
goto mandos_end;
984
810
}
985
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
986
812
987
813
if(buffer_length > 0){
988
814
ssize_t decrypted_buffer_size;
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
817
&decrypted_buffer);
991
818
if(decrypted_buffer_size >= 0){
992
819
993
820
written = 0;
994
821
while(written < (size_t) decrypted_buffer_size){
995
822
if(quit_now){
996
errno = EINTR;
997
823
goto mandos_end;
998
824
}
999
825
1001
827
(size_t)decrypted_buffer_size - written,
1002
828
stdout);
1003
829
if(ret == 0 and ferror(stdout)){
1004
int e = errno;
1005
830
if(debug){
1006
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1007
strerror(errno));
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
1008
833
}
1009
errno = e;
1010
834
goto mandos_end;
1011
835
}
1012
836
written += (size_t)ret;
1018
842
/* Shutdown procedure */
1019
843
1020
844
mandos_end:
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
}
845
free(decrypted_buffer);
846
free(buffer);
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
850
if(ret == -1){
851
perror("close");
852
}
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
1040
856
}
1041
857
return retval;
1042
858
}
1043
859
1044
__attribute__((nonnull))
1045
860
static void resolve_callback(AvahiSServiceResolver *r,
1046
861
AvahiIfIndex interface,
1047
862
AvahiProtocol proto,
1055
870
AVAHI_GCC_UNUSED AvahiStringList *txt,
1056
871
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1057
872
flags,
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
873
AVAHI_GCC_UNUSED void* userdata){
874
assert(r);
1062
875
1063
876
/* Called whenever a service has been resolved successfully or
1064
877
timed out */
1070
883
switch(event){
1071
884
default:
1072
885
case AVAHI_RESOLVER_FAILURE:
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)));
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
888
avahi_strerror(avahi_server_errno(mc.server)));
1078
889
break;
1079
890
1080
891
case AVAHI_RESOLVER_FOUND:
1082
893
char ip[AVAHI_ADDRESS_STR_MAX];
1083
894
avahi_address_snprint(ip, sizeof(ip), address);
1084
895
if(debug){
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);
896
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
ip, (intmax_t)interface, port);
1088
899
}
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
900
int ret = start_mandos_communication(ip, port, interface,
901
avahi_proto_to_af(proto));
1093
902
if(ret == 0){
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
}
903
avahi_simple_poll_quit(mc.simple_poll);
1102
904
}
1103
905
}
1104
906
}
1114
916
const char *domain,
1115
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1116
918
flags,
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(b);
1121
921
1122
922
/* Called whenever a new services becomes available on the LAN or
1123
923
is removed from the LAN */
1130
930
default:
1131
931
case AVAHI_BROWSER_FAILURE:
1132
932
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);
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
935
avahi_simple_poll_quit(mc.simple_poll);
1137
936
return;
1138
937
1139
938
case AVAHI_BROWSER_NEW:
1142
941
the callback function is called the Avahi server will free the
1143
942
resolver for us. */
1144
943
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)));
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
name, type, domain, protocol, 0,
946
resolve_callback, NULL) == NULL)
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
1153
949
break;
1154
950
1155
951
case AVAHI_BROWSER_REMOVE:
1158
954
case AVAHI_BROWSER_ALL_FOR_NOW:
1159
955
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1160
956
if(debug){
1161
fprintf_plus(stderr, "No Mandos server found, still"
1162
" searching...\n");
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1163
958
}
1164
959
break;
1165
960
}
1166
961
}
1167
962
1168
/* Signal handler that stops main loop after SIGTERM */
963
/* stop main loop after sigterm has been called */
1169
964
static void handle_sigterm(int sig){
1170
965
if(quit_now){
1171
966
return;
1173
968
quit_now = 1;
1174
969
signal_received = sig;
1175
970
int old_errno = errno;
1176
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1179
}
1180
errno = old_errno;
1181
}
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
1251
/*
1252
* This function determines if a directory entry in /sys/class/net
1253
* corresponds to an acceptable network device.
1254
* (This function is passed to scandir(3) as a filter function.)
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1257
int good_interface(const struct dirent *if_entry){
1258
if(if_entry->d_name[0] == '.'){
1259
return 0;
1260
}
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
bool restore_loglevel = false;
1719
if(ret_errno != 0){
1720
perror_plus("Failed to raise privileges");
1721
}
1722
#ifdef __linux__
1723
int ret_linux;
1724
if(ret_errno == 0){
1725
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1726
messages about the network interface to mess up the prompt */
1727
ret_linux = klogctl(8, NULL, 5);
1728
if(ret_linux == -1){
1729
perror_plus("klogctl");
1730
} else {
1731
restore_loglevel = true;
1732
}
1733
}
1734
#endif /* __linux__ */
1735
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1736
ioctl_errno = errno;
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
ret_linux = klogctl(7, NULL, 0);
1740
if(ret_linux == -1){
1741
perror_plus("klogctl");
1742
}
1743
}
1744
#endif /* __linux__ */
1745
1746
/* If raise_privileges() succeeded above */
1747
if(ret_errno == 0){
1748
/* Lower privileges */
1749
ret_errno = lower_privileges();
1750
if(ret_errno != 0){
1751
errno = ret_errno;
1752
perror_plus("Failed to lower privileges");
1753
}
1754
}
1755
1756
/* Close the socket */
1757
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1758
if(ret == -1){
1759
perror_plus("close");
1760
}
1761
1762
if(ret_setflags == -1){
1763
errno = ioctl_errno;
1764
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1765
errno = old_errno;
1766
return ioctl_errno;
1767
}
1768
} else if(debug){
1769
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1770
interface);
1771
}
1772
1773
/* Sleep checking until interface is running.
1774
Check every 0.25s, up to total time of delay */
1775
for(int i=0; i < delay * 4; i++){
1776
if(interface_is_running(interface)){
1777
break;
1778
}
1779
struct timespec sleeptime = { .tv_nsec = 250000000 };
1780
ret = nanosleep(&sleeptime, NULL);
1781
if(ret == -1 and errno != EINTR){
1782
perror_plus("nanosleep");
1783
}
1784
}
1785
1786
errno = old_errno;
1787
return 0;
1788
}
1789
1790
__attribute__((nonnull, warn_unused_result))
1791
error_t take_down_interface(const char *const interface){
1792
error_t old_errno = errno;
1793
struct ifreq network;
1794
unsigned int if_index = if_nametoindex(interface);
1795
if(if_index == 0){
1796
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1797
errno = old_errno;
1798
return ENXIO;
1799
}
1800
if(interface_is_up(interface)){
1801
error_t ret_errno = 0, ioctl_errno = 0;
1802
if(not get_flags(interface, &network) and debug){
1803
ret_errno = errno;
1804
fprintf_plus(stderr, "Failed to get flags for interface "
1805
"\"%s\"\n", interface);
1806
errno = old_errno;
1807
return ret_errno;
1808
}
1809
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1810
1811
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1812
if(sd == -1){
1813
ret_errno = errno;
1814
perror_plus("socket");
1815
errno = old_errno;
1816
return ret_errno;
1817
}
1818
1819
if(debug){
1820
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1821
interface);
1822
}
1823
1824
/* Raise privileges */
1825
ret_errno = raise_privileges();
1826
if(ret_errno != 0){
1827
perror_plus("Failed to raise privileges");
1828
}
1829
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1830
ioctl_errno = errno;
1831
1832
/* If raise_privileges() succeeded above */
1833
if(ret_errno == 0){
1834
/* Lower privileges */
1835
ret_errno = lower_privileges();
1836
if(ret_errno != 0){
1837
errno = ret_errno;
1838
perror_plus("Failed to lower privileges");
1839
}
1840
}
1841
1842
/* Close the socket */
1843
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1844
if(ret == -1){
1845
perror_plus("close");
1846
}
1847
1848
if(ret_setflags == -1){
1849
errno = ioctl_errno;
1850
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1851
errno = old_errno;
1852
return ioctl_errno;
1853
}
1854
} else if(debug){
1855
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1856
interface);
1857
}
1858
1859
errno = old_errno;
1860
return 0;
971
if(mc.simple_poll != NULL){
972
avahi_simple_poll_quit(mc.simple_poll);
973
}
974
errno = old_errno;
1861
975
}
1862
976
1863
977
int main(int argc, char *argv[]){
1864
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1865
.priority = "SECURE256:!CTYPE-X.509:"
1866
"+CTYPE-OPENPGP", .current_server = NULL,
1867
.interfaces = NULL, .interfaces_size = 0 };
1868
978
AvahiSServiceBrowser *sb = NULL;
1869
error_t ret_errno;
979
int error;
1870
980
int ret;
1871
981
intmax_t tmpmax;
1872
982
char *tmp;
1873
983
int exitcode = EXIT_SUCCESS;
1874
char *interfaces_to_take_down = NULL;
1875
size_t interfaces_to_take_down_size = 0;
1876
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1877
char old_tempdir[] = "/tmp/mandosXXXXXX";
1878
char *tempdir = NULL;
984
const char *interface = "eth0";
985
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
991
char tempdir[] = "/tmp/mandosXXXXXX";
992
bool tempdir_created = false;
1879
993
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1880
994
const char *seckey = PATHDIR "/" SECKEY;
1881
995
const char *pubkey = PATHDIR "/" PUBKEY;
1882
char *interfaces_hooks = NULL;
1883
996
1884
997
bool gnutls_initialized = false;
1885
998
bool gpgme_initialized = false;
1886
999
float delay = 2.5f;
1887
double retry_interval = 10; /* 10s between trying a server and
1888
retrying the same server again */
1889
1000
1890
1001
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1891
1002
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1897
1008
errno = 0;
1898
1009
ret = setgid(gid);
1899
1010
if(ret == -1){
1900
perror_plus("setgid");
1011
perror("setgid");
1901
1012
}
1902
1013
1903
1014
/* Lower user privileges (temporarily) */
1904
1015
errno = 0;
1905
1016
ret = seteuid(uid);
1906
1017
if(ret == -1){
1907
perror_plus("seteuid");
1018
perror("seteuid");
1908
1019
}
1909
1020
1910
1021
if(quit_now){
1945
1056
.arg = "SECONDS",
1946
1057
.doc = "Maximum delay to wait for interface startup",
1947
1058
.group = 2 },
1948
{ .name = "retry", .key = 132,
1949
.arg = "SECONDS",
1950
.doc = "Retry interval used when denied by the Mandos server",
1951
.group = 2 },
1952
{ .name = "network-hook-dir", .key = 133,
1953
.arg = "DIR",
1954
.doc = "Directory where network hooks are located",
1955
.group = 2 },
1956
/*
1957
* These reproduce what we would get without ARGP_NO_HELP
1958
*/
1959
{ .name = "help", .key = '?',
1960
.doc = "Give this help list", .group = -1 },
1961
{ .name = "usage", .key = -3,
1962
.doc = "Give a short usage message", .group = -1 },
1963
{ .name = "version", .key = 'V',
1964
.doc = "Print program version", .group = -1 },
1965
1059
{ .name = NULL }
1966
1060
};
1967
1061
1968
1062
error_t parse_opt(int key, char *arg,
1969
1063
struct argp_state *state){
1970
errno = 0;
1971
1064
switch(key){
1972
1065
case 128: /* --debug */
1973
1066
debug = true;
1976
1069
connect_to = arg;
1977
1070
break;
1978
1071
case 'i': /* --interface */
1979
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1980
arg, (int)',');
1981
if(ret_errno != 0){
1982
argp_error(state, "%s", strerror(ret_errno));
1983
}
1072
interface = arg;
1984
1073
break;
1985
1074
case 's': /* --seckey */
1986
1075
seckey = arg;
1993
1082
tmpmax = strtoimax(arg, &tmp, 10);
1994
1083
if(errno != 0 or tmp == arg or *tmp != '\0'
1995
1084
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1996
argp_error(state, "Bad number of DH bits");
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
1997
1087
}
1998
1088
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1999
1089
break;
2004
1094
errno = 0;
2005
1095
delay = strtof(arg, &tmp);
2006
1096
if(errno != 0 or tmp == arg or *tmp != '\0'){
2007
argp_error(state, "Bad delay");
2008
}
2009
case 132: /* --retry */
2010
errno = 0;
2011
retry_interval = strtod(arg, &tmp);
2012
if(errno != 0 or tmp == arg or *tmp != '\0'
2013
or (retry_interval * 1000) > INT_MAX
2014
or retry_interval < 0){
2015
argp_error(state, "Bad retry interval");
2016
}
2017
break;
2018
case 133: /* --network-hook-dir */
2019
hookdir = arg;
2020
break;
2021
/*
2022
* These reproduce what we would get without ARGP_NO_HELP
2023
*/
2024
case '?': /* --help */
2025
argp_state_help(state, state->out_stream,
2026
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2027
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2028
case -3: /* --usage */
2029
argp_state_help(state, state->out_stream,
2030
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2031
case 'V': /* --version */
2032
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2033
exit(argp_err_exit_status);
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
2034
1104
break;
2035
1105
default:
2036
1106
return ARGP_ERR_UNKNOWN;
2037
1107
}
2038
return errno;
1108
return 0;
2039
1109
}
2040
1110
2041
1111
struct argp argp = { .options = options, .parser = parse_opt,
2042
1112
.args_doc = "",
2043
1113
.doc = "Mandos client -- Get and decrypt"
2044
1114
" passwords from a Mandos server" };
2045
ret = argp_parse(&argp, argc, argv,
2046
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2047
switch(ret){
2048
case 0:
2049
break;
2050
case ENOMEM:
2051
default:
2052
errno = ret;
2053
perror_plus("argp_parse");
2054
exitcode = EX_OSERR;
2055
goto end;
2056
case EINVAL:
2057
exitcode = EX_USAGE;
2058
goto end;
2059
}
2060
}
2061
2062
{
2063
/* Work around Debian bug #633582:
2064
<http://bugs.debian.org/633582> */
2065
2066
/* Re-raise privileges */
2067
ret_errno = raise_privileges();
2068
if(ret_errno != 0){
2069
errno = ret_errno;
2070
perror_plus("Failed to raise privileges");
2071
} else {
2072
struct stat st;
2073
2074
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2075
int seckey_fd = open(seckey, O_RDONLY);
2076
if(seckey_fd == -1){
2077
perror_plus("open");
2078
} else {
2079
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2080
if(ret == -1){
2081
perror_plus("fstat");
2082
} else {
2083
if(S_ISREG(st.st_mode)
2084
and st.st_uid == 0 and st.st_gid == 0){
2085
ret = fchown(seckey_fd, uid, gid);
2086
if(ret == -1){
2087
perror_plus("fchown");
2088
}
2089
}
2090
}
2091
TEMP_FAILURE_RETRY(close(seckey_fd));
2092
}
2093
}
2094
2095
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2096
int pubkey_fd = open(pubkey, O_RDONLY);
2097
if(pubkey_fd == -1){
2098
perror_plus("open");
2099
} else {
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2101
if(ret == -1){
2102
perror_plus("fstat");
2103
} else {
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(pubkey_fd, uid, gid);
2107
if(ret == -1){
2108
perror_plus("fchown");
2109
}
2110
}
2111
}
2112
TEMP_FAILURE_RETRY(close(pubkey_fd));
2113
}
2114
}
2115
2116
/* Lower privileges */
2117
ret_errno = lower_privileges();
2118
if(ret_errno != 0){
2119
errno = ret_errno;
2120
perror_plus("Failed to lower privileges");
2121
}
2122
}
2123
}
2124
2125
/* Remove invalid interface names (except "none") */
2126
{
2127
char *interface = NULL;
2128
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2129
interface))){
2130
if(strcmp(interface, "none") != 0
2131
and if_nametoindex(interface) == 0){
2132
if(interface[0] != '\0'){
2133
fprintf_plus(stderr, "Not using nonexisting interface"
2134
" \"%s\"\n", interface);
2135
}
2136
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2137
interface = NULL;
2138
}
2139
}
2140
}
2141
2142
/* Run network hooks */
2143
{
2144
if(mc.interfaces != NULL){
2145
interfaces_hooks = malloc(mc.interfaces_size);
2146
if(interfaces_hooks == NULL){
2147
perror_plus("malloc");
2148
goto end;
2149
}
2150
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2151
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2152
}
2153
run_network_hooks("start", interfaces_hooks != NULL ?
2154
interfaces_hooks : "", delay);
1115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1116
if(ret == ARGP_ERR_UNKNOWN){
1117
fprintf(stderr, "Unknown error while parsing arguments\n");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
2155
1121
}
2156
1122
2157
1123
if(not debug){
2162
1128
from the signal handler */
2163
1129
/* Initialize the pseudo-RNG for Avahi */
2164
1130
srand((unsigned int) time(NULL));
2165
simple_poll = avahi_simple_poll_new();
2166
if(simple_poll == NULL){
2167
fprintf_plus(stderr,
2168
"Avahi: Failed to create simple poll object.\n");
2169
exitcode = EX_UNAVAILABLE;
1131
mc.simple_poll = avahi_simple_poll_new();
1132
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
2170
1135
goto end;
2171
1136
}
2172
1137
2173
1138
sigemptyset(&sigterm_action.sa_mask);
2174
1139
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2175
1140
if(ret == -1){
2176
perror_plus("sigaddset");
2177
exitcode = EX_OSERR;
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
2178
1143
goto end;
2179
1144
}
2180
1145
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2181
1146
if(ret == -1){
2182
perror_plus("sigaddset");
2183
exitcode = EX_OSERR;
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
2184
1149
goto end;
2185
1150
}
2186
1151
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2187
1152
if(ret == -1){
2188
perror_plus("sigaddset");
2189
exitcode = EX_OSERR;
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
2190
1155
goto end;
2191
1156
}
2192
1157
/* Need to check if the handler is SIG_IGN before handling:
2195
1160
*/
2196
1161
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2197
1162
if(ret == -1){
2198
perror_plus("sigaction");
2199
return EX_OSERR;
1163
perror("sigaction");
1164
return EXIT_FAILURE;
2200
1165
}
2201
1166
if(old_sigterm_action.sa_handler != SIG_IGN){
2202
1167
ret = sigaction(SIGINT, &sigterm_action, NULL);
2203
1168
if(ret == -1){
2204
perror_plus("sigaction");
2205
exitcode = EX_OSERR;
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
2206
1171
goto end;
2207
1172
}
2208
1173
}
2209
1174
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2210
1175
if(ret == -1){
2211
perror_plus("sigaction");
2212
return EX_OSERR;
1176
perror("sigaction");
1177
return EXIT_FAILURE;
2213
1178
}
2214
1179
if(old_sigterm_action.sa_handler != SIG_IGN){
2215
1180
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2216
1181
if(ret == -1){
2217
perror_plus("sigaction");
2218
exitcode = EX_OSERR;
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
2219
1184
goto end;
2220
1185
}
2221
1186
}
2222
1187
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2223
1188
if(ret == -1){
2224
perror_plus("sigaction");
2225
return EX_OSERR;
1189
perror("sigaction");
1190
return EXIT_FAILURE;
2226
1191
}
2227
1192
if(old_sigterm_action.sa_handler != SIG_IGN){
2228
1193
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2229
1194
if(ret == -1){
2230
perror_plus("sigaction");
2231
exitcode = EX_OSERR;
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
2232
1197
goto end;
2233
1198
}
2234
1199
}
2235
1200
2236
/* If no interfaces were specified, make a list */
2237
if(mc.interfaces == NULL){
2238
struct dirent **direntries;
2239
/* Look for any good interfaces */
2240
ret = scandir(sys_class_net, &direntries, good_interface,
2241
alphasort);
2242
if(ret >= 1){
2243
/* Add all found interfaces to interfaces list */
2244
for(int i = 0; i < ret; ++i){
2245
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2246
direntries[i]->d_name);
2247
if(ret_errno != 0){
2248
errno = ret_errno;
2249
perror_plus("argz_add");
2250
continue;
2251
}
2252
if(debug){
2253
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2254
direntries[i]->d_name);
2255
}
2256
}
2257
free(direntries);
1201
/* If the interface is down, bring it up */
1202
if(interface[0] != '\0'){
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1204
if(if_index == 0){
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
1221
#ifdef __linux__
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
messages to mess up the prompt */
1224
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
if(ret == -1){
1227
restore_loglevel = false;
1228
perror("klogctl");
1229
}
1230
#endif /* __linux__ */
1231
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
if(sd < 0){
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1236
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1250
goto end;
1251
}
1252
strcpy(network.ifr_name, interface);
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1254
if(ret == -1){
1255
perror("ioctl SIOCGIFFLAGS");
1256
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
1262
}
1263
#endif /* __linux__ */
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
goto end;
1272
}
1273
if((network.ifr_flags & IFF_UP) == 0){
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
if(ret == -1){
1278
take_down_interface = false;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1281
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
1286
}
1287
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1295
goto end;
1296
}
1297
}
1298
/* sleep checking until interface is running */
1299
for(int i=0; i < delay * 4; i++){
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1301
if(ret == -1){
1302
perror("ioctl SIOCGIFFLAGS");
1303
} else if(network.ifr_flags & IFF_RUNNING){
1304
break;
1305
}
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1307
ret = nanosleep(&sleeptime, NULL);
1308
if(ret == -1 and errno != EINTR){
1309
perror("nanosleep");
1310
}
1311
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1318
}
1319
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
2258
1336
} else {
2259
free(direntries);
2260
fprintf_plus(stderr, "Could not find a network interface\n");
2261
exitcode = EXIT_FAILURE;
2262
goto end;
2263
}
2264
}
2265
2266
/* Bring up interfaces which are down, and remove any "none"s */
2267
{
2268
char *interface = NULL;
2269
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2270
interface))){
2271
/* If interface name is "none", stop bringing up interfaces.
2272
Also remove all instances of "none" from the list */
2273
if(strcmp(interface, "none") == 0){
2274
argz_delete(&mc.interfaces, &mc.interfaces_size,
2275
interface);
2276
interface = NULL;
2277
while((interface = argz_next(mc.interfaces,
2278
mc.interfaces_size, interface))){
2279
if(strcmp(interface, "none") == 0){
2280
argz_delete(&mc.interfaces, &mc.interfaces_size,
2281
interface);
2282
interface = NULL;
2283
}
2284
}
2285
break;
2286
}
2287
bool interface_was_up = interface_is_up(interface);
2288
errno = bring_up_interface(interface, delay);
2289
if(not interface_was_up){
2290
if(errno != 0){
2291
perror_plus("Failed to bring up interface");
2292
} else {
2293
errno = argz_add(&interfaces_to_take_down,
2294
&interfaces_to_take_down_size,
2295
interface);
2296
if(errno != 0){
2297
perror_plus("argz_add");
2298
}
2299
}
2300
}
2301
}
2302
if(debug and (interfaces_to_take_down == NULL)){
2303
fprintf_plus(stderr, "No interfaces were brought up\n");
2304
}
2305
}
2306
2307
/* If we only got one interface, explicitly use only that one */
2308
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2309
if(debug){
2310
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2311
mc.interfaces);
2312
}
2313
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1342
}
2314
1343
}
2315
1344
2316
1345
if(quit_now){
2317
1346
goto end;
2318
1347
}
2319
1348
2320
ret = init_gnutls_global(pubkey, seckey, &mc);
1349
ret = init_gnutls_global(pubkey, seckey);
2321
1350
if(ret == -1){
2322
fprintf_plus(stderr, "init_gnutls_global failed\n");
2323
exitcode = EX_UNAVAILABLE;
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2324
1353
goto end;
2325
1354
} else {
2326
1355
gnutls_initialized = true;
2330
1359
goto end;
2331
1360
}
2332
1361
2333
/* Try /run/tmp before /tmp */
2334
tempdir = mkdtemp(run_tempdir);
2335
if(tempdir == NULL and errno == ENOENT){
2336
if(debug){
2337
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2338
run_tempdir, old_tempdir);
2339
}
2340
tempdir = mkdtemp(old_tempdir);
2341
}
2342
if(tempdir == NULL){
2343
perror_plus("mkdtemp");
1362
tempdir_created = true;
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
perror("mkdtemp");
2344
1366
goto end;
2345
1367
}
2346
1368
2348
1370
goto end;
2349
1371
}
2350
1372
2351
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2352
fprintf_plus(stderr, "init_gpgme failed\n");
2353
exitcode = EX_UNAVAILABLE;
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2354
1376
goto end;
2355
1377
} else {
2356
1378
gpgme_initialized = true;
2364
1386
/* Connect directly, do not use Zeroconf */
2365
1387
/* (Mainly meant for debugging) */
2366
1388
char *address = strrchr(connect_to, ':');
2367
2368
1389
if(address == NULL){
2369
fprintf_plus(stderr, "No colon in address\n");
2370
exitcode = EX_USAGE;
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2371
1392
goto end;
2372
1393
}
2373
1394
2375
1396
goto end;
2376
1397
}
2377
1398
2378
in_port_t port;
1399
uint16_t port;
2379
1400
errno = 0;
2380
1401
tmpmax = strtoimax(address+1, &tmp, 10);
2381
1402
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2382
or tmpmax != (in_port_t)tmpmax){
2383
fprintf_plus(stderr, "Bad port number\n");
2384
exitcode = EX_USAGE;
1403
or tmpmax != (uint16_t)tmpmax){
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2385
1406
goto end;
2386
1407
}
2387
1408
2388
1409
if(quit_now){
2389
1410
goto end;
2390
1411
}
2391
1412
2392
port = (in_port_t)tmpmax;
1413
port = (uint16_t)tmpmax;
2393
1414
*address = '\0';
1415
address = connect_to;
2394
1416
/* Colon in address indicates IPv6 */
2395
1417
int af;
2396
if(strchr(connect_to, ':') != NULL){
1418
if(strchr(address, ':') != NULL){
2397
1419
af = AF_INET6;
2398
/* Accept [] around IPv6 address - see RFC 5952 */
2399
if(connect_to[0] == '[' and address[-1] == ']')
2400
{
2401
connect_to++;
2402
address[-1] = '\0';
2403
}
2404
1420
} else {
2405
1421
af = AF_INET;
2406
1422
}
2407
address = connect_to;
2408
1423
2409
1424
if(quit_now){
2410
1425
goto end;
2411
1426
}
2412
1427
2413
while(not quit_now){
2414
ret = start_mandos_communication(address, port, if_index, af,
2415
&mc);
2416
if(quit_now or ret == 0){
2417
break;
2418
}
2419
if(debug){
2420
fprintf_plus(stderr, "Retrying in %d seconds\n",
2421
(int)retry_interval);
2422
}
2423
sleep((unsigned int)retry_interval);
2424
}
2425
2426
if(not quit_now){
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2427
1432
exitcode = EXIT_SUCCESS;
2428
1433
}
2429
2430
1434
goto end;
2431
1435
}
2432
1436
2444
1448
config.publish_domain = 0;
2445
1449
2446
1450
/* Allocate a new server */
2447
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2448
&config, NULL, NULL, &ret_errno);
1451
mc.server = avahi_server_new(avahi_simple_poll_get
1452
(mc.simple_poll), &config, NULL,
1453
NULL, &error);
2449
1454
2450
1455
/* Free the Avahi configuration data */
2451
1456
avahi_server_config_free(&config);
2453
1458
2454
1459
/* Check if creating the Avahi server object succeeded */
2455
1460
if(mc.server == NULL){
2456
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2457
avahi_strerror(ret_errno));
2458
exitcode = EX_UNAVAILABLE;
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
2459
1464
goto end;
2460
1465
}
2461
1466
2466
1471
/* Create the Avahi service browser */
2467
1472
sb = avahi_s_service_browser_new(mc.server, if_index,
2468
1473
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2469
NULL, 0, browse_callback,
2470
(void *)&mc);
1474
NULL, 0, browse_callback, NULL);
2471
1475
if(sb == NULL){
2472
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2473
avahi_strerror(avahi_server_errno(mc.server)));
2474
exitcode = EX_UNAVAILABLE;
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
2475
1479
goto end;
2476
1480
}
2477
1481
2482
1486
/* Run the main loop */
2483
1487
2484
1488
if(debug){
2485
fprintf_plus(stderr, "Starting Avahi loop search\n");
2486
}
2487
2488
ret = avahi_loop_with_timeout(simple_poll,
2489
(int)(retry_interval * 1000), &mc);
2490
if(debug){
2491
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2492
(ret == 0) ? "successfully" : "with error");
2493
}
1489
fprintf(stderr, "Starting Avahi loop search\n");
1490
}
1491
1492
avahi_simple_poll_loop(mc.simple_poll);
2494
1493
2495
1494
end:
2496
1495
2497
1496
if(debug){
2498
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1497
fprintf(stderr, "%s exiting\n", argv[0]);
2499
1498
}
2500
1499
2501
1500
/* Cleanup things */
2502
free(mc.interfaces);
2503
2504
1501
if(sb != NULL)
2505
1502
avahi_s_service_browser_free(sb);
2506
1503
2507
1504
if(mc.server != NULL)
2508
1505
avahi_server_free(mc.server);
2509
1506
2510
if(simple_poll != NULL)
2511
avahi_simple_poll_free(simple_poll);
1507
if(mc.simple_poll != NULL)
1508
avahi_simple_poll_free(mc.simple_poll);
2512
1509
2513
1510
if(gnutls_initialized){
2514
1511
gnutls_certificate_free_credentials(mc.cred);
2520
1517
gpgme_release(mc.ctx);
2521
1518
}
2522
1519
2523
/* Cleans up the circular linked list of Mandos servers the client
2524
has seen */
2525
if(mc.current_server != NULL){
2526
mc.current_server->prev->next = NULL;
2527
while(mc.current_server != NULL){
2528
server *next = mc.current_server->next;
2529
free(mc.current_server);
2530
mc.current_server = next;
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
1537
}
1538
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
1548
}
2531
1549
}
2532
1550
}
2533
1551
2534
/* Re-raise privileges */
2535
{
2536
ret_errno = raise_privileges();
2537
if(ret_errno != 0){
2538
perror_plus("Failed to raise privileges");
1552
/* Removes the temp directory used by GPGME */
1553
if(tempdir_created){
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1559
perror("opendir");
1560
}
2539
1561
} else {
2540
2541
/* Run network hooks */
2542
run_network_hooks("stop", interfaces_hooks != NULL ?
2543
interfaces_hooks : "", delay);
2544
2545
/* Take down the network interfaces which were brought up */
2546
{
2547
char *interface = NULL;
2548
while((interface=argz_next(interfaces_to_take_down,
2549
interfaces_to_take_down_size,
2550
interface))){
2551
ret_errno = take_down_interface(interface);
2552
if(ret_errno != 0){
2553
errno = ret_errno;
2554
perror_plus("Failed to take down interface");
2555
}
2556
}
2557
if(debug and (interfaces_to_take_down == NULL)){
2558
fprintf_plus(stderr, "No interfaces needed to be taken"
2559
" down\n");
2560
}
2561
}
2562
}
2563
ret_errno = lower_privileges_permanently();
2564
if(ret_errno != 0){
2565
perror_plus("Failed to lower privileges permanently");
2566
}
2567
}
2568
2569
free(interfaces_to_take_down);
2570
free(interfaces_hooks);
2571
2572
/* Removes the GPGME temp directory and all files inside */
2573
if(tempdir != NULL){
2574
struct dirent **direntries = NULL;
2575
struct dirent *direntry = NULL;
2576
int numentries = scandir(tempdir, &direntries, notdotentries,
2577
alphasort);
2578
if(numentries > 0){
2579
for(int i = 0; i < numentries; i++){
2580
direntry = direntries[i];
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
2581
1574
char *fullname = NULL;
2582
1575
ret = asprintf(&fullname, "%s/%s", tempdir,
2583
1576
direntry->d_name);
2584
1577
if(ret < 0){
2585
perror_plus("asprintf");
1578
perror("asprintf");
2586
1579
continue;
2587
1580
}
2588
1581
ret = remove(fullname);
2589
1582
if(ret == -1){
2590
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2591
strerror(errno));
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
2592
1585
}
2593
1586
free(fullname);
2594
1587
}
2595
}
2596
2597
/* need to clean even if 0 because man page doesn't specify */
2598
free(direntries);
2599
if(numentries == -1){
2600
perror_plus("scandir");
1588
closedir(d);
2601
1589
}
2602
1590
ret = rmdir(tempdir);
2603
1591
if(ret == -1 and errno != ENOENT){
2604
perror_plus("rmdir");
1592
perror("rmdir");
2605
1593
}
2606
1594
}
2607
1595
2608
1596
if(quit_now){
2609
1597
sigemptyset(&old_sigterm_action.sa_mask);
2610
1598
old_sigterm_action.sa_handler = SIG_DFL;
2611
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2612
&old_sigterm_action,
2613
NULL));
1599
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2614
1600
if(ret == -1){
2615
perror_plus("sigaction");
2616
}
2617
do {
2618
ret = raise(signal_received);
2619
} while(ret != 0 and errno == EINTR);
2620
if(ret != 0){
2621
perror_plus("raise");
2622
abort();
2623
}
2624
TEMP_FAILURE_RETRY(pause());
1601
perror("sigaction");
1602
}
1603
raise(signal_received);
2625
1604
}
2626
1605
2627
1606
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0