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237.2.175
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-12-26 01:19:47 UTC
- mto: (24.1.146 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20091226011947-qapwzqvwxl5r565s
* mandos-ctl (defaultkeywords): Removed "checker".
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
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(), pause() */
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,
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
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
87
98
88
#ifdef __linux__
99
89
#include <sys/klog.h> /* klogctl() */
117
107
init_gnutls_session(),
118
108
GNUTLS_* */
119
109
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
122
112
123
113
/* GPGME */
124
114
#include <gpgme.h> /* All GPGME types, constants and
132
122
#define PATHDIR "/conf/conf.d/mandos"
133
123
#define SECKEY "seckey.txt"
134
124
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
125
137
126
bool debug = false;
138
127
static const char mandos_protocol_version[] = "1";
139
128
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;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
157
130
158
131
/* Used for passing in values through the Avahi callback functions */
159
132
typedef struct {
133
AvahiSimplePoll *simple_poll;
160
134
AvahiServer *server;
161
135
gnutls_certificate_credentials_t cred;
162
136
unsigned int dh_bits;
163
137
gnutls_dh_params_t dh_params;
164
138
const char *priority;
165
139
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
140
} mandos_context;
170
141
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
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" };
173
146
174
147
sig_atomic_t quit_now = 0;
175
148
int signal_received = 0;
176
149
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)))
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
150
/*
197
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
152
* bytes. "buffer_capacity" is how much is currently allocated,
199
153
* "buffer_length" is how much is already used.
200
154
*/
201
155
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
156
size_t buffer_capacity){
203
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
if(buffer == NULL){
210
160
return 0;
211
161
}
212
*buffer = new_buf;
213
162
buffer_capacity += BUFFER_SIZE;
214
163
}
215
164
return buffer_capacity;
216
165
}
217
166
218
/* Add server to set of servers to retry periodically */
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
221
int ret;
222
server *new_server = malloc(sizeof(server));
223
if(new_server == NULL){
224
perror_plus("malloc");
225
return false;
226
}
227
*new_server = (server){ .ip = strdup(ip),
228
.port = port,
229
.if_index = if_index,
230
.af = af };
231
if(new_server->ip == NULL){
232
perror_plus("strdup");
233
return false;
234
}
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
if(ret == -1){
237
perror_plus("clock_gettime");
238
return false;
239
}
240
/* Special case of first server */
241
if(*current_server == NULL){
242
new_server->next = new_server;
243
new_server->prev = new_server;
244
*current_server = new_server;
245
/* Place the new server last in the list */
246
} else {
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
249
new_server->prev->next = new_server;
250
(*current_server)->prev = new_server;
251
}
252
return true;
253
}
254
255
167
/*
256
168
* Initialize GPGME.
257
169
*/
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
260
172
gpgme_error_t rc;
261
173
gpgme_engine_info_t engine_info;
262
174
175
263
176
/*
264
177
* Helper function to insert pub and seckey to the engine keyring.
265
178
*/
270
183
271
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
272
185
if(fd == -1){
273
perror_plus("open");
186
perror("open");
274
187
return false;
275
188
}
276
189
277
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
278
191
if(rc != GPG_ERR_NO_ERROR){
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
281
194
return false;
282
195
}
283
196
284
rc = gpgme_op_import(mc->ctx, pgp_data);
197
rc = gpgme_op_import(mc.ctx, pgp_data);
285
198
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
288
201
return false;
289
202
}
290
203
291
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
292
205
if(ret == -1){
293
perror_plus("close");
206
perror("close");
294
207
}
295
208
gpgme_data_release(pgp_data);
296
209
return true;
297
210
}
298
211
299
212
if(debug){
300
fprintf_plus(stderr, "Initializing GPGME\n");
213
fprintf(stderr, "Initializing GPGME\n");
301
214
}
302
215
303
216
/* Init GPGME */
304
217
gpgme_check_version(NULL);
305
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
306
219
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
309
222
return false;
310
223
}
311
224
312
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
313
226
rc = gpgme_get_engine_info(&engine_info);
314
227
if(rc != GPG_ERR_NO_ERROR){
315
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
gpgme_strsource(rc), gpgme_strerror(rc));
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
317
230
return false;
318
231
}
319
232
while(engine_info != NULL){
325
238
engine_info = engine_info->next;
326
239
}
327
240
if(engine_info == NULL){
328
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
329
tempdir);
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
330
242
return false;
331
243
}
332
244
333
245
/* Create new GPGME "context" */
334
rc = gpgme_new(&(mc->ctx));
246
rc = gpgme_new(&(mc.ctx));
335
247
if(rc != GPG_ERR_NO_ERROR){
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
339
250
return false;
340
251
}
341
252
352
263
*/
353
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
265
size_t crypto_size,
355
char **plaintext,
356
mandos_context *mc){
266
char **plaintext){
357
267
gpgme_data_t dh_crypto, dh_plain;
358
268
gpgme_error_t rc;
359
269
ssize_t ret;
361
271
ssize_t plaintext_length = 0;
362
272
363
273
if(debug){
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
365
275
}
366
276
367
277
/* Create new GPGME data buffer from memory cryptotext */
368
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
369
279
0);
370
280
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
373
283
return -1;
374
284
}
375
285
376
286
/* Create new empty GPGME data buffer for the plaintext */
377
287
rc = gpgme_data_new(&dh_plain);
378
288
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
382
291
gpgme_data_release(dh_crypto);
383
292
return -1;
384
293
}
385
294
386
295
/* Decrypt data from the cryptotext data buffer to the plaintext
387
296
data buffer */
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
389
298
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
392
301
plaintext_length = -1;
393
302
if(debug){
394
303
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
304
result = gpgme_op_decrypt_result(mc.ctx);
396
305
if(result == NULL){
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
398
307
} else {
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
result->wrong_key_usage);
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
403
312
if(result->file_name != NULL){
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
313
fprintf(stderr, "File name: %s\n", result->file_name);
405
314
}
406
315
gpgme_recipient_t recipient;
407
316
recipient = result->recipients;
408
317
while(recipient != NULL){
409
fprintf_plus(stderr, "Public key algorithm: %s\n",
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
413
fprintf_plus(stderr, "Secret key available: %s\n",
414
recipient->status == GPG_ERR_NO_SECKEY
415
? "No" : "Yes");
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");
416
324
recipient = recipient->next;
417
325
}
418
326
}
421
329
}
422
330
423
331
if(debug){
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
425
333
}
426
334
427
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
428
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
429
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
430
338
plaintext_length = -1;
431
339
goto decrypt_end;
432
340
}
434
342
*plaintext = NULL;
435
343
while(true){
436
344
plaintext_capacity = incbuffer(plaintext,
437
(size_t)plaintext_length,
438
plaintext_capacity);
345
(size_t)plaintext_length,
346
plaintext_capacity);
439
347
if(plaintext_capacity == 0){
440
perror_plus("incbuffer");
441
plaintext_length = -1;
442
goto decrypt_end;
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
443
351
}
444
352
445
353
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
450
358
break;
451
359
}
452
360
if(ret < 0){
453
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
454
362
plaintext_length = -1;
455
363
goto decrypt_end;
456
364
}
458
366
}
459
367
460
368
if(debug){
461
fprintf_plus(stderr, "Decrypted password is: ");
369
fprintf(stderr, "Decrypted password is: ");
462
370
for(ssize_t i = 0; i < plaintext_length; i++){
463
371
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
464
372
}
476
384
}
477
385
478
386
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value);
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
480
389
if(ret == NULL)
481
390
ret = "(unknown)";
482
391
return ret;
485
394
/* GnuTLS log function callback */
486
395
static void debuggnutls(__attribute__((unused)) int level,
487
396
const char* string){
488
fprintf_plus(stderr, "GnuTLS: %s", string);
397
fprintf(stderr, "GnuTLS: %s", string);
489
398
}
490
399
491
400
static int init_gnutls_global(const char *pubkeyfilename,
492
const char *seckeyfilename,
493
mandos_context *mc){
401
const char *seckeyfilename){
494
402
int ret;
495
403
496
404
if(debug){
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
405
fprintf(stderr, "Initializing GnuTLS\n");
498
406
}
499
407
500
408
ret = gnutls_global_init();
501
409
if(ret != GNUTLS_E_SUCCESS){
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
504
412
return -1;
505
413
}
506
414
513
421
}
514
422
515
423
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
517
425
if(ret != GNUTLS_E_SUCCESS){
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
safer_gnutls_strerror(ret));
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
520
431
gnutls_global_deinit();
521
432
return -1;
522
433
}
523
434
524
435
if(debug){
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
527
pubkeyfilename,
528
seckeyfilename);
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
529
439
}
530
440
531
441
ret = gnutls_certificate_set_openpgp_key_file
532
(mc->cred, pubkeyfilename, seckeyfilename,
442
(mc.cred, pubkeyfilename, seckeyfilename,
533
443
GNUTLS_OPENPGP_FMT_BASE64);
534
444
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr,
536
"Error[%d] while reading the OpenPGP key pair ('%s',"
537
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
538
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
539
safer_gnutls_strerror(ret));
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));
540
450
goto globalfail;
541
451
}
542
452
543
453
/* GnuTLS server initialization */
544
ret = gnutls_dh_params_init(&mc->dh_params);
454
ret = gnutls_dh_params_init(&mc.dh_params);
545
455
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
" initialization: %s\n",
548
safer_gnutls_strerror(ret));
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
549
458
goto globalfail;
550
459
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
552
461
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
555
464
goto globalfail;
556
465
}
557
466
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
559
468
560
469
return 0;
561
470
562
471
globalfail:
563
472
564
gnutls_certificate_free_credentials(mc->cred);
473
gnutls_certificate_free_credentials(mc.cred);
565
474
gnutls_global_deinit();
566
gnutls_dh_params_deinit(mc->dh_params);
475
gnutls_dh_params_deinit(mc.dh_params);
567
476
return -1;
568
477
}
569
478
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
479
static int init_gnutls_session(gnutls_session_t *session){
572
480
int ret;
573
481
/* GnuTLS session creation */
574
482
do {
578
486
}
579
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
580
488
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr,
582
"Error in GnuTLS session initialization: %s\n",
583
safer_gnutls_strerror(ret));
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
584
491
}
585
492
586
493
{
587
494
const char *err;
588
495
do {
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
590
497
if(quit_now){
591
498
gnutls_deinit(*session);
592
499
return -1;
593
500
}
594
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
595
502
if(ret != GNUTLS_E_SUCCESS){
596
fprintf_plus(stderr, "Syntax error at: %s\n", err);
597
fprintf_plus(stderr, "GnuTLS error: %s\n",
598
safer_gnutls_strerror(ret));
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
599
506
gnutls_deinit(*session);
600
507
return -1;
601
508
}
603
510
604
511
do {
605
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
606
mc->cred);
513
mc.cred);
607
514
if(quit_now){
608
515
gnutls_deinit(*session);
609
516
return -1;
610
517
}
611
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
612
519
if(ret != GNUTLS_E_SUCCESS){
613
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
614
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
615
522
gnutls_deinit(*session);
616
523
return -1;
617
524
}
619
526
/* ignore client certificate if any. */
620
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
621
528
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
623
530
624
531
return 0;
625
532
}
629
536
__attribute__((unused)) const char *txt){}
630
537
631
538
/* Called when a Mandos server is found */
632
static int start_mandos_communication(const char *ip, in_port_t port,
539
static int start_mandos_communication(const char *ip, uint16_t port,
633
540
AvahiIfIndex if_index,
634
int af, mandos_context *mc){
541
int af){
635
542
int ret, tcp_sd = -1;
636
543
ssize_t sret;
637
struct sockaddr_storage to;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
638
548
char *buffer = NULL;
639
549
char *decrypted_buffer = NULL;
640
550
size_t buffer_length = 0;
659
569
pf = PF_INET;
660
570
break;
661
571
default:
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
572
fprintf(stderr, "Bad address family: %d\n", af);
663
573
errno = EINVAL;
664
574
return -1;
665
575
}
666
576
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
577
ret = init_gnutls_session(&session);
700
578
if(ret != 0){
701
579
return -1;
702
580
}
703
581
704
582
if(debug){
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
707
585
}
708
586
709
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
710
588
if(tcp_sd < 0){
711
589
int e = errno;
712
perror_plus("socket");
590
perror("socket");
713
591
errno = e;
714
592
goto mandos_end;
715
593
}
721
599
722
600
memset(&to, 0, sizeof(to));
723
601
if(af == AF_INET6){
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
602
to.in6.sin6_family = (sa_family_t)af;
603
ret = inet_pton(af, ip, &to.in6.sin6_addr);
726
604
} else { /* IPv4 */
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
605
to.in.sin_family = (sa_family_t)af;
606
ret = inet_pton(af, ip, &to.in.sin_addr);
729
607
}
730
608
if(ret < 0 ){
731
609
int e = errno;
732
perror_plus("inet_pton");
610
perror("inet_pton");
733
611
errno = e;
734
612
goto mandos_end;
735
613
}
736
614
if(ret == 0){
737
615
int e = errno;
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
616
fprintf(stderr, "Bad address: %s\n", ip);
739
617
errno = e;
740
618
goto mandos_end;
741
619
}
742
620
if(af == AF_INET6){
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
if(IN6_IS_ADDR_LINKLOCAL
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
746
628
if(if_index == AVAHI_IF_UNSPEC){
747
fprintf_plus(stderr, "An IPv6 link-local address is"
748
" incomplete without a network interface\n");
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
749
631
errno = EINVAL;
750
632
goto mandos_end;
751
633
}
752
634
/* Set the network interface number as scope */
753
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
635
to.in6.sin6_scope_id = (uint32_t)if_index;
754
636
}
755
637
} else {
756
((struct sockaddr_in *)&to)->sin_port = htons(port);
638
to.in.sin_port = htons(port); /* Spurious warnings from
639
-Wconversion and
640
-Wunreachable-code */
757
641
}
758
642
759
643
if(quit_now){
765
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
766
650
char interface[IF_NAMESIZE];
767
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
768
perror_plus("if_indextoname");
652
perror("if_indextoname");
769
653
} else {
770
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
771
"\n", ip, interface, (uintmax_t)port);
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
772
656
}
773
657
} else {
774
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
775
ip, (uintmax_t)port);
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
776
660
}
777
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
778
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
663
const char *pcret;
779
664
if(af == AF_INET6){
780
ret = getnameinfo((struct sockaddr *)&to,
781
sizeof(struct sockaddr_in6),
782
addrstr, sizeof(addrstr), NULL, 0,
783
NI_NUMERICHOST);
665
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
666
sizeof(addrstr));
784
667
} else {
785
ret = getnameinfo((struct sockaddr *)&to,
786
sizeof(struct sockaddr_in),
787
addrstr, sizeof(addrstr), NULL, 0,
788
NI_NUMERICHOST);
668
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
669
sizeof(addrstr));
789
670
}
790
if(ret == EAI_SYSTEM){
791
perror_plus("getnameinfo");
792
} else if(ret != 0) {
793
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
794
} else if(strcmp(addrstr, ip) != 0){
795
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
671
if(pcret == NULL){
672
perror("inet_ntop");
673
} else {
674
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
676
}
796
677
}
797
678
}
798
679
802
683
}
803
684
804
685
if(af == AF_INET6){
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
686
ret = connect(tcp_sd, &to.in6, sizeof(to));
807
687
} else {
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
810
689
}
811
690
if(ret < 0){
812
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
813
int e = errno;
814
perror_plus("connect");
815
errno = e;
816
}
691
int e = errno;
692
perror("connect");
693
errno = e;
817
694
goto mandos_end;
818
695
}
819
696
827
704
while(true){
828
705
size_t out_size = strlen(out);
829
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
830
out_size - written));
707
out_size - written));
831
708
if(ret == -1){
832
709
int e = errno;
833
perror_plus("write");
710
perror("write");
834
711
errno = e;
835
712
goto mandos_end;
836
713
}
853
730
}
854
731
855
732
if(debug){
856
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
857
734
}
858
735
859
736
if(quit_now){
861
738
goto mandos_end;
862
739
}
863
740
864
/* This casting via intptr_t is to eliminate warning about casting
865
an int to a pointer type. This is exactly how the GnuTLS Guile
866
function "set-session-transport-fd!" does it. */
867
gnutls_transport_set_ptr(session,
868
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
869
742
870
743
if(quit_now){
871
744
errno = EINTR;
882
755
883
756
if(ret != GNUTLS_E_SUCCESS){
884
757
if(debug){
885
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
886
759
gnutls_perror(ret);
887
760
}
888
761
errno = EPROTO;
892
765
/* Read OpenPGP packet that contains the wanted password */
893
766
894
767
if(debug){
895
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
896
" %s\n", ip);
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
897
770
}
898
771
899
772
while(true){
904
777
}
905
778
906
779
buffer_capacity = incbuffer(&buffer, buffer_length,
907
buffer_capacity);
780
buffer_capacity);
908
781
if(buffer_capacity == 0){
909
782
int e = errno;
910
perror_plus("incbuffer");
783
perror("incbuffer");
911
784
errno = e;
912
785
goto mandos_end;
913
786
}
937
810
}
938
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
939
812
if(ret < 0){
940
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
941
"***\n");
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
942
814
gnutls_perror(ret);
943
815
errno = EPROTO;
944
816
goto mandos_end;
945
817
}
946
818
break;
947
819
default:
948
fprintf_plus(stderr, "Unknown error while reading data from"
949
" encrypted session with Mandos server\n");
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
950
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
951
823
errno = EIO;
952
824
goto mandos_end;
957
829
}
958
830
959
831
if(debug){
960
fprintf_plus(stderr, "Closing TLS session\n");
832
fprintf(stderr, "Closing TLS session\n");
961
833
}
962
834
963
835
if(quit_now){
975
847
976
848
if(buffer_length > 0){
977
849
ssize_t decrypted_buffer_size;
978
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
979
&decrypted_buffer, mc);
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
852
&decrypted_buffer);
980
853
if(decrypted_buffer_size >= 0){
981
854
982
855
written = 0;
992
865
if(ret == 0 and ferror(stdout)){
993
866
int e = errno;
994
867
if(debug){
995
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
996
strerror(errno));
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
997
870
}
998
871
errno = e;
999
872
goto mandos_end;
1018
891
if(e == 0){
1019
892
e = errno;
1020
893
}
1021
perror_plus("close");
894
perror("close");
1022
895
}
1023
896
gnutls_deinit(session);
1024
errno = e;
1025
897
if(quit_now){
1026
errno = EINTR;
898
e = EINTR;
1027
899
retval = -1;
1028
900
}
901
errno = e;
1029
902
}
1030
903
return retval;
1031
904
}
1043
916
AVAHI_GCC_UNUSED AvahiStringList *txt,
1044
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1045
918
flags,
1046
void* mc){
1047
if(r == NULL){
1048
return;
1049
}
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(r);
1050
921
1051
922
/* Called whenever a service has been resolved successfully or
1052
923
timed out */
1058
929
switch(event){
1059
930
default:
1060
931
case AVAHI_RESOLVER_FAILURE:
1061
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1062
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1063
domain,
1064
avahi_strerror(avahi_server_errno
1065
(((mandos_context*)mc)->server)));
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
avahi_strerror(avahi_server_errno(mc.server)));
1066
935
break;
1067
936
1068
937
case AVAHI_RESOLVER_FOUND:
1070
939
char ip[AVAHI_ADDRESS_STR_MAX];
1071
940
avahi_address_snprint(ip, sizeof(ip), address);
1072
941
if(debug){
1073
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1074
PRIdMAX ") on port %" PRIu16 "\n", name,
1075
host_name, ip, (intmax_t)interface, port);
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
1076
945
}
1077
int ret = start_mandos_communication(ip, (in_port_t)port,
1078
interface,
1079
avahi_proto_to_af(proto),
1080
mc);
946
int ret = start_mandos_communication(ip, port, interface,
947
avahi_proto_to_af(proto));
1081
948
if(ret == 0){
1082
avahi_simple_poll_quit(simple_poll);
1083
} else {
1084
if(not add_server(ip, (in_port_t)port, interface,
1085
avahi_proto_to_af(proto),
1086
&((mandos_context*)mc)->current_server)){
1087
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1088
" list\n", name);
1089
}
949
avahi_simple_poll_quit(mc.simple_poll);
1090
950
}
1091
951
}
1092
952
}
1102
962
const char *domain,
1103
963
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1104
964
flags,
1105
void* mc){
1106
if(b == NULL){
1107
return;
1108
}
965
AVAHI_GCC_UNUSED void* userdata){
966
assert(b);
1109
967
1110
968
/* Called whenever a new services becomes available on the LAN or
1111
969
is removed from the LAN */
1118
976
default:
1119
977
case AVAHI_BROWSER_FAILURE:
1120
978
1121
fprintf_plus(stderr, "(Avahi browser) %s\n",
1122
avahi_strerror(avahi_server_errno
1123
(((mandos_context*)mc)->server)));
1124
avahi_simple_poll_quit(simple_poll);
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
1125
982
return;
1126
983
1127
984
case AVAHI_BROWSER_NEW:
1130
987
the callback function is called the Avahi server will free the
1131
988
resolver for us. */
1132
989
1133
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1134
interface, protocol, name, type,
1135
domain, protocol, 0,
1136
resolve_callback, mc) == NULL)
1137
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1138
" %s\n", name,
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
name, avahi_strerror(avahi_server_errno(mc.server)));
1141
995
break;
1142
996
1143
997
case AVAHI_BROWSER_REMOVE:
1146
1000
case AVAHI_BROWSER_ALL_FOR_NOW:
1147
1001
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1148
1002
if(debug){
1149
fprintf_plus(stderr, "No Mandos server found, still"
1150
" searching...\n");
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1151
1004
}
1152
1005
break;
1153
1006
}
1154
1007
}
1155
1008
1156
/* Signal handler that stops main loop after SIGTERM */
1009
/* stop main loop after sigterm has been called */
1157
1010
static void handle_sigterm(int sig){
1158
1011
if(quit_now){
1159
1012
return;
1161
1014
quit_now = 1;
1162
1015
signal_received = sig;
1163
1016
int old_errno = errno;
1164
/* set main loop to exit */
1165
if(simple_poll != NULL){
1166
avahi_simple_poll_quit(simple_poll);
1167
}
1168
errno = old_errno;
1169
}
1170
1171
bool get_flags(const char *ifname, struct ifreq *ifr){
1172
int ret;
1173
error_t ret_errno;
1174
1175
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1176
if(s < 0){
1177
ret_errno = errno;
1178
perror_plus("socket");
1179
errno = ret_errno;
1180
return false;
1181
}
1182
strcpy(ifr->ifr_name, ifname);
1183
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1184
if(ret == -1){
1185
if(debug){
1186
ret_errno = errno;
1187
perror_plus("ioctl SIOCGIFFLAGS");
1188
errno = ret_errno;
1189
}
1190
return false;
1191
}
1192
return true;
1193
}
1194
1195
bool good_flags(const char *ifname, const struct ifreq *ifr){
1196
1197
/* Reject the loopback device */
1198
if(ifr->ifr_flags & IFF_LOOPBACK){
1199
if(debug){
1200
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1201
ifname);
1202
}
1203
return false;
1204
}
1205
/* Accept point-to-point devices only if connect_to is specified */
1206
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1207
if(debug){
1208
fprintf_plus(stderr, "Accepting point-to-point interface"
1209
" \"%s\"\n", ifname);
1210
}
1211
return true;
1212
}
1213
/* Otherwise, reject non-broadcast-capable devices */
1214
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1215
if(debug){
1216
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1217
" \"%s\"\n", ifname);
1218
}
1219
return false;
1220
}
1221
/* Reject non-ARP interfaces (including dummy interfaces) */
1222
if(ifr->ifr_flags & IFF_NOARP){
1223
if(debug){
1224
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1225
ifname);
1226
}
1227
return false;
1228
}
1229
1230
/* Accept this device */
1231
if(debug){
1232
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1233
}
1234
return true;
1235
}
1236
1237
/*
1238
* This function determines if a directory entry in /sys/class/net
1239
* corresponds to an acceptable network device.
1240
* (This function is passed to scandir(3) as a filter function.)
1241
*/
1242
int good_interface(const struct dirent *if_entry){
1243
if(if_entry->d_name[0] == '.'){
1244
return 0;
1245
}
1246
1247
struct ifreq ifr;
1248
if(not get_flags(if_entry->d_name, &ifr)){
1249
if(debug){
1250
fprintf_plus(stderr, "Failed to get flags for interface "
1251
"\"%s\"\n", if_entry->d_name);
1252
}
1253
return 0;
1254
}
1255
1256
if(not good_flags(if_entry->d_name, &ifr)){
1257
return 0;
1258
}
1259
return 1;
1260
}
1261
1262
/*
1263
* This function determines if a network interface is up.
1264
*/
1265
bool interface_is_up(const char *interface){
1266
struct ifreq ifr;
1267
if(not get_flags(interface, &ifr)){
1268
if(debug){
1269
fprintf_plus(stderr, "Failed to get flags for interface "
1270
"\"%s\"\n", interface);
1271
}
1272
return false;
1273
}
1274
1275
return (bool)(ifr.ifr_flags & IFF_UP);
1276
}
1277
1278
/*
1279
* This function determines if a network interface is running
1280
*/
1281
bool interface_is_running(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_RUNNING);
1292
}
1293
1294
int notdotentries(const struct dirent *direntry){
1295
/* Skip "." and ".." */
1296
if(direntry->d_name[0] == '.'
1297
and (direntry->d_name[1] == '\0'
1298
or (direntry->d_name[1] == '.'
1299
and direntry->d_name[2] == '\0'))){
1300
return 0;
1301
}
1302
return 1;
1303
}
1304
1305
/* Is this directory entry a runnable program? */
1306
int runnable_hook(const struct dirent *direntry){
1307
int ret;
1308
size_t sret;
1309
struct stat st;
1310
1311
if((direntry->d_name)[0] == '\0'){
1312
/* Empty name? */
1313
return 0;
1314
}
1315
1316
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1317
"abcdefghijklmnopqrstuvwxyz"
1318
"0123456789"
1319
"_-");
1320
if((direntry->d_name)[sret] != '\0'){
1321
/* Contains non-allowed characters */
1322
if(debug){
1323
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1324
direntry->d_name);
1325
}
1326
return 0;
1327
}
1328
1329
char *fullname = NULL;
1330
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1331
if(ret < 0){
1332
perror_plus("asprintf");
1333
return 0;
1334
}
1335
1336
ret = stat(fullname, &st);
1337
if(ret == -1){
1338
if(debug){
1339
perror_plus("Could not stat hook");
1340
}
1341
return 0;
1342
}
1343
if(not (S_ISREG(st.st_mode))){
1344
/* Not a regular file */
1345
if(debug){
1346
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1347
direntry->d_name);
1348
}
1349
return 0;
1350
}
1351
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1352
/* Not executable */
1353
if(debug){
1354
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1355
direntry->d_name);
1356
}
1357
return 0;
1358
}
1359
if(debug){
1360
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1361
direntry->d_name);
1362
}
1363
return 1;
1364
}
1365
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
mandos_context *mc){
1368
int ret;
1369
struct timespec now;
1370
struct timespec waited_time;
1371
intmax_t block_time;
1372
1373
while(true){
1374
if(mc->current_server == NULL){
1375
if(debug){
1376
fprintf_plus(stderr, "Wait until first server is found."
1377
" No timeout!\n");
1378
}
1379
ret = avahi_simple_poll_iterate(s, -1);
1380
} else {
1381
if(debug){
1382
fprintf_plus(stderr, "Check current_server if we should run"
1383
" it, or wait\n");
1384
}
1385
/* the current time */
1386
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1387
if(ret == -1){
1388
perror_plus("clock_gettime");
1389
return -1;
1390
}
1391
/* Calculating in ms how long time between now and server
1392
who we visted longest time ago. Now - last seen. */
1393
waited_time.tv_sec = (now.tv_sec
1394
- mc->current_server->last_seen.tv_sec);
1395
waited_time.tv_nsec = (now.tv_nsec
1396
- mc->current_server->last_seen.tv_nsec);
1397
/* total time is 10s/10,000ms.
1398
Converting to s from ms by dividing by 1,000,
1399
and ns to ms by dividing by 1,000,000. */
1400
block_time = ((retry_interval
1401
- ((intmax_t)waited_time.tv_sec * 1000))
1402
- ((intmax_t)waited_time.tv_nsec / 1000000));
1403
1404
if(debug){
1405
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1406
block_time);
1407
}
1408
1409
if(block_time <= 0){
1410
ret = start_mandos_communication(mc->current_server->ip,
1411
mc->current_server->port,
1412
mc->current_server->if_index,
1413
mc->current_server->af, mc);
1414
if(ret == 0){
1415
avahi_simple_poll_quit(s);
1416
return 0;
1417
}
1418
ret = clock_gettime(CLOCK_MONOTONIC,
1419
&mc->current_server->last_seen);
1420
if(ret == -1){
1421
perror_plus("clock_gettime");
1422
return -1;
1423
}
1424
mc->current_server = mc->current_server->next;
1425
block_time = 0; /* Call avahi to find new Mandos
1426
servers, but don't block */
1427
}
1428
1429
ret = avahi_simple_poll_iterate(s, (int)block_time);
1430
}
1431
if(ret != 0){
1432
if(ret > 0 or errno != EINTR){
1433
return (ret != 1) ? ret : 0;
1434
}
1435
}
1436
}
1437
}
1438
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
bool run_network_hooks(const char *mode, const char *interface,
1492
const float delay){
1493
struct dirent **direntries;
1494
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
alphasort);
1496
if(numhooks == -1){
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
1504
}
1505
} else {
1506
struct dirent *direntry;
1507
int ret;
1508
int devnull = open("/dev/null", O_RDONLY);
1509
for(int i = 0; i < numhooks; i++){
1510
direntry = direntries[i];
1511
char *fullname = NULL;
1512
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1513
if(ret < 0){
1514
perror_plus("asprintf");
1515
continue;
1516
}
1517
if(debug){
1518
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1519
direntry->d_name);
1520
}
1521
pid_t hook_pid = fork();
1522
if(hook_pid == 0){
1523
/* Child */
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1526
/* Set group */
1527
errno = 0;
1528
ret = setgid(0);
1529
if(ret == -1){
1530
perror_plus("setgid");
1531
}
1532
/* Reset supplementary groups */
1533
errno = 0;
1534
ret = setgroups(0, NULL);
1535
if(ret == -1){
1536
perror_plus("setgroups");
1537
}
1538
dup2(devnull, STDIN_FILENO);
1539
close(devnull);
1540
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("DEVICE", interface, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1552
if(ret == -1){
1553
perror_plus("setenv");
1554
_exit(EX_OSERR);
1555
}
1556
ret = setenv("MODE", mode, 1);
1557
if(ret == -1){
1558
perror_plus("setenv");
1559
_exit(EX_OSERR);
1560
}
1561
char *delaystring;
1562
ret = asprintf(&delaystring, "%f", delay);
1563
if(ret == -1){
1564
perror_plus("asprintf");
1565
_exit(EX_OSERR);
1566
}
1567
ret = setenv("DELAY", delaystring, 1);
1568
if(ret == -1){
1569
free(delaystring);
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
free(delaystring);
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1576
if(ret == -1){
1577
perror_plus("setenv");
1578
_exit(EX_OSERR);
1579
}
1580
}
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1584
}
1585
} else {
1586
int status;
1587
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1588
perror_plus("waitpid");
1589
free(fullname);
1590
continue;
1591
}
1592
if(WIFEXITED(status)){
1593
if(WEXITSTATUS(status) != 0){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1595
" with status %d\n", direntry->d_name,
1596
WEXITSTATUS(status));
1597
free(fullname);
1598
continue;
1599
}
1600
} else if(WIFSIGNALED(status)){
1601
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1602
" signal %d\n", direntry->d_name,
1603
WTERMSIG(status));
1604
free(fullname);
1605
continue;
1606
} else {
1607
fprintf_plus(stderr, "Warning: network hook \"%s\""
1608
" crashed\n", direntry->d_name);
1609
free(fullname);
1610
continue;
1611
}
1612
}
1613
free(fullname);
1614
if(debug){
1615
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1616
direntry->d_name);
1617
}
1618
}
1619
close(devnull);
1620
}
1621
return true;
1622
}
1623
1624
error_t bring_up_interface(const char *const interface,
1625
const float delay){
1626
int sd = -1;
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
1630
struct ifreq network;
1631
unsigned int if_index = if_nametoindex(interface);
1632
if(if_index == 0){
1633
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1634
errno = old_errno;
1635
return ENXIO;
1636
}
1637
1638
if(quit_now){
1639
errno = old_errno;
1640
return EINTR;
1641
}
1642
1643
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
1645
ret_errno = errno;
1646
fprintf_plus(stderr, "Failed to get flags for interface "
1647
"\"%s\"\n", interface);
1648
return ret_errno;
1649
}
1650
network.ifr_flags |= IFF_UP;
1651
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
1654
ret_errno = errno;
1655
perror_plus("socket");
1656
errno = old_errno;
1657
return ret_errno;
1658
}
1659
1660
if(quit_now){
1661
close(sd);
1662
errno = old_errno;
1663
return EINTR;
1664
}
1665
1666
if(debug){
1667
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1668
interface);
1669
}
1670
1671
/* Raise priviliges */
1672
raise_privileges();
1673
1674
#ifdef __linux__
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
1682
}
1683
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
1686
#ifdef __linux__
1687
if(restore_loglevel){
1688
ret_linux = klogctl(7, NULL, 0);
1689
if(ret_linux == -1){
1690
perror_plus("klogctl");
1691
}
1692
}
1693
#endif /* __linux__ */
1694
1695
/* Lower privileges */
1696
lower_privileges();
1697
1698
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1700
if(ret == -1){
1701
perror_plus("close");
1702
}
1703
1704
if(ret_setflags == -1){
1705
errno = ret_errno;
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1707
errno = old_errno;
1708
return ret_errno;
1709
}
1710
} else if(debug){
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1712
interface);
1713
}
1714
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
if(interface_is_running(interface)){
1719
break;
1720
}
1721
struct timespec sleeptime = { .tv_nsec = 250000000 };
1722
ret = nanosleep(&sleeptime, NULL);
1723
if(ret == -1 and errno != EINTR){
1724
perror_plus("nanosleep");
1725
}
1726
}
1727
1728
errno = old_errno;
1729
return 0;
1730
}
1731
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
error_t ret_errno = 0;
1743
if(not get_flags(interface, &network) and debug){
1744
ret_errno = errno;
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
return ret_errno;
1748
}
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1752
if(sd < 0){
1753
ret_errno = errno;
1754
perror_plus("socket");
1755
errno = old_errno;
1756
return ret_errno;
1757
}
1758
1759
if(debug){
1760
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1761
interface);
1762
}
1763
1764
/* Raise priviliges */
1765
raise_privileges();
1766
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ret_errno = errno;
1769
1770
/* Lower privileges */
1771
lower_privileges();
1772
1773
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
if(ret == -1){
1776
perror_plus("close");
1777
}
1778
1779
if(ret_setflags == -1){
1780
errno = ret_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1782
errno = old_errno;
1783
return ret_errno;
1784
}
1785
} else if(debug){
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
interface);
1788
}
1789
1790
errno = old_errno;
1791
return 0;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1792
1021
}
1793
1022
1794
1023
int main(int argc, char *argv[]){
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
1799
1024
AvahiSServiceBrowser *sb = NULL;
1800
error_t ret_errno;
1025
int error;
1801
1026
int ret;
1802
1027
intmax_t tmpmax;
1803
1028
char *tmp;
1804
1029
int exitcode = EXIT_SUCCESS;
1805
char *interfaces_to_take_down = NULL;
1806
size_t interfaces_to_take_down_size = 0;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1807
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1808
1038
bool tempdir_created = false;
1809
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1810
1040
const char *seckey = PATHDIR "/" SECKEY;
1811
1041
const char *pubkey = PATHDIR "/" PUBKEY;
1812
char *interfaces_hooks = NULL;
1813
1042
1814
1043
bool gnutls_initialized = false;
1815
1044
bool gpgme_initialized = false;
1816
1045
float delay = 2.5f;
1817
double retry_interval = 10; /* 10s between trying a server and
1818
retrying the same server again */
1819
1046
1820
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1821
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1827
1054
errno = 0;
1828
1055
ret = setgid(gid);
1829
1056
if(ret == -1){
1830
perror_plus("setgid");
1057
perror("setgid");
1831
1058
}
1832
1059
1833
1060
/* Lower user privileges (temporarily) */
1834
1061
errno = 0;
1835
1062
ret = seteuid(uid);
1836
1063
if(ret == -1){
1837
perror_plus("seteuid");
1064
perror("seteuid");
1838
1065
}
1839
1066
1840
1067
if(quit_now){
1875
1102
.arg = "SECONDS",
1876
1103
.doc = "Maximum delay to wait for interface startup",
1877
1104
.group = 2 },
1878
{ .name = "retry", .key = 132,
1879
.arg = "SECONDS",
1880
.doc = "Retry interval used when denied by the Mandos server",
1881
.group = 2 },
1882
{ .name = "network-hook-dir", .key = 133,
1883
.arg = "DIR",
1884
.doc = "Directory where network hooks are located",
1885
.group = 2 },
1886
1105
/*
1887
1106
* These reproduce what we would get without ARGP_NO_HELP
1888
1107
*/
1906
1125
connect_to = arg;
1907
1126
break;
1908
1127
case 'i': /* --interface */
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1128
interface = arg;
1914
1129
break;
1915
1130
case 's': /* --seckey */
1916
1131
seckey = arg;
1936
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1937
1152
argp_error(state, "Bad delay");
1938
1153
}
1939
case 132: /* --retry */
1940
errno = 0;
1941
retry_interval = strtod(arg, &tmp);
1942
if(errno != 0 or tmp == arg or *tmp != '\0'
1943
or (retry_interval * 1000) > INT_MAX
1944
or retry_interval < 0){
1945
argp_error(state, "Bad retry interval");
1946
}
1947
break;
1948
case 133: /* --network-hook-dir */
1949
hookdir = arg;
1950
1154
break;
1951
1155
/*
1952
1156
* These reproduce what we would get without ARGP_NO_HELP
1959
1163
argp_state_help(state, state->out_stream,
1960
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
1165
case 'V': /* --version */
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1963
1167
exit(argp_err_exit_status);
1964
1168
break;
1965
1169
default:
1980
1184
case ENOMEM:
1981
1185
default:
1982
1186
errno = ret;
1983
perror_plus("argp_parse");
1187
perror("argp_parse");
1984
1188
exitcode = EX_OSERR;
1985
1189
goto end;
1986
1190
case EINVAL:
1988
1192
goto end;
1989
1193
}
1990
1194
}
1991
1992
{
1993
/* Work around Debian bug #633582:
1994
<http://bugs.debian.org/633582> */
1995
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
2061
}
2062
}
2063
2064
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2074
}
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
2077
goto end;
2078
}
2079
}
2080
1195
2081
1196
if(not debug){
2082
1197
avahi_set_log_function(empty_log);
2086
1201
from the signal handler */
2087
1202
/* Initialize the pseudo-RNG for Avahi */
2088
1203
srand((unsigned int) time(NULL));
2089
simple_poll = avahi_simple_poll_new();
2090
if(simple_poll == NULL){
2091
fprintf_plus(stderr,
2092
"Avahi: Failed to create simple poll object.\n");
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2093
1207
exitcode = EX_UNAVAILABLE;
2094
1208
goto end;
2095
1209
}
2097
1211
sigemptyset(&sigterm_action.sa_mask);
2098
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2099
1213
if(ret == -1){
2100
perror_plus("sigaddset");
1214
perror("sigaddset");
2101
1215
exitcode = EX_OSERR;
2102
1216
goto end;
2103
1217
}
2104
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2105
1219
if(ret == -1){
2106
perror_plus("sigaddset");
1220
perror("sigaddset");
2107
1221
exitcode = EX_OSERR;
2108
1222
goto end;
2109
1223
}
2110
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2111
1225
if(ret == -1){
2112
perror_plus("sigaddset");
1226
perror("sigaddset");
2113
1227
exitcode = EX_OSERR;
2114
1228
goto end;
2115
1229
}
2119
1233
*/
2120
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2121
1235
if(ret == -1){
2122
perror_plus("sigaction");
1236
perror("sigaction");
2123
1237
return EX_OSERR;
2124
1238
}
2125
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
2126
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
2127
1241
if(ret == -1){
2128
perror_plus("sigaction");
1242
perror("sigaction");
2129
1243
exitcode = EX_OSERR;
2130
1244
goto end;
2131
1245
}
2132
1246
}
2133
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2134
1248
if(ret == -1){
2135
perror_plus("sigaction");
1249
perror("sigaction");
2136
1250
return EX_OSERR;
2137
1251
}
2138
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
2139
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2140
1254
if(ret == -1){
2141
perror_plus("sigaction");
1255
perror("sigaction");
2142
1256
exitcode = EX_OSERR;
2143
1257
goto end;
2144
1258
}
2145
1259
}
2146
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2147
1261
if(ret == -1){
2148
perror_plus("sigaction");
1262
perror("sigaction");
2149
1263
return EX_OSERR;
2150
1264
}
2151
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
2152
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2153
1267
if(ret == -1){
2154
perror_plus("sigaction");
1268
perror("sigaction");
2155
1269
exitcode = EX_OSERR;
2156
1270
goto end;
2157
1271
}
2158
1272
}
2159
1273
2160
/* If no interfaces were specified, make a list */
2161
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2163
/* Look for any good interfaces */
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2165
alphasort);
2166
if(ret >= 1){
2167
/* Add all found interfaces to interfaces list */
2168
for(int i = 0; i < ret; ++i){
2169
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2170
direntries[i]->d_name);
2171
if(ret_errno != 0){
2172
errno = ret_errno;
2173
perror_plus("argz_add");
2174
continue;
2175
}
2176
if(debug){
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
direntries[i]->d_name);
2179
}
2180
}
2181
free(direntries);
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
1359
}
1360
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
break;
1378
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
2182
1409
} else {
2183
free(direntries);
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2185
exitcode = EXIT_FAILURE;
2186
goto end;
2187
}
2188
}
2189
2190
/* Bring up interfaces which are down, and remove any "none"s */
2191
{
2192
char *interface = NULL;
2193
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2194
interface))){
2195
/* If interface name is "none", stop bringing up interfaces.
2196
Also remove all instances of "none" from the list */
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
2201
while((interface = argz_next(mc.interfaces,
2202
mc.interfaces_size, interface))){
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
2207
}
2208
}
2209
break;
2210
}
2211
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2213
if(not interface_was_up){
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2217
} else {
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2223
perror_plus("argz_add");
2224
}
2225
}
2226
}
2227
}
2228
if(debug and (interfaces_to_take_down == NULL)){
2229
fprintf_plus(stderr, "No interfaces were brought up\n");
2230
}
2231
}
2232
2233
/* If we only got one interface, explicitly use only that one */
2234
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2235
if(debug){
2236
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2237
mc.interfaces);
2238
}
2239
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
2240
1416
}
2241
1417
2242
1418
if(quit_now){
2243
1419
goto end;
2244
1420
}
2245
1421
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
1422
ret = init_gnutls_global(pubkey, seckey);
2247
1423
if(ret == -1){
2248
fprintf_plus(stderr, "init_gnutls_global failed\n");
1424
fprintf(stderr, "init_gnutls_global failed\n");
2249
1425
exitcode = EX_UNAVAILABLE;
2250
1426
goto end;
2251
1427
} else {
2256
1432
goto end;
2257
1433
}
2258
1434
1435
tempdir_created = true;
2259
1436
if(mkdtemp(tempdir) == NULL){
2260
perror_plus("mkdtemp");
1437
tempdir_created = false;
1438
perror("mkdtemp");
2261
1439
goto end;
2262
1440
}
2263
tempdir_created = true;
2264
1441
2265
1442
if(quit_now){
2266
1443
goto end;
2267
1444
}
2268
1445
2269
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2270
fprintf_plus(stderr, "init_gpgme failed\n");
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
2271
1448
exitcode = EX_UNAVAILABLE;
2272
1449
goto end;
2273
1450
} else {
2282
1459
/* Connect directly, do not use Zeroconf */
2283
1460
/* (Mainly meant for debugging) */
2284
1461
char *address = strrchr(connect_to, ':');
2285
2286
1462
if(address == NULL){
2287
fprintf_plus(stderr, "No colon in address\n");
1463
fprintf(stderr, "No colon in address\n");
2288
1464
exitcode = EX_USAGE;
2289
1465
goto end;
2290
1466
}
2293
1469
goto end;
2294
1470
}
2295
1471
2296
in_port_t port;
1472
uint16_t port;
2297
1473
errno = 0;
2298
1474
tmpmax = strtoimax(address+1, &tmp, 10);
2299
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2300
or tmpmax != (in_port_t)tmpmax){
2301
fprintf_plus(stderr, "Bad port number\n");
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2302
1478
exitcode = EX_USAGE;
2303
1479
goto end;
2304
1480
}
2305
1481
2306
1482
if(quit_now){
2307
1483
goto end;
2308
1484
}
2309
1485
2310
port = (in_port_t)tmpmax;
1486
port = (uint16_t)tmpmax;
2311
1487
*address = '\0';
1488
address = connect_to;
2312
1489
/* Colon in address indicates IPv6 */
2313
1490
int af;
2314
if(strchr(connect_to, ':') != NULL){
1491
if(strchr(address, ':') != NULL){
2315
1492
af = AF_INET6;
2316
/* Accept [] around IPv6 address - see RFC 5952 */
2317
if(connect_to[0] == '[' and address[-1] == ']')
2318
{
2319
connect_to++;
2320
address[-1] = '\0';
2321
}
2322
1493
} else {
2323
1494
af = AF_INET;
2324
1495
}
2325
address = connect_to;
2326
1496
2327
1497
if(quit_now){
2328
1498
goto end;
2329
1499
}
2330
1500
2331
while(not quit_now){
2332
ret = start_mandos_communication(address, port, if_index, af,
2333
&mc);
2334
if(quit_now or ret == 0){
2335
break;
2336
}
2337
if(debug){
2338
fprintf_plus(stderr, "Retrying in %d seconds\n",
2339
(int)retry_interval);
2340
}
2341
sleep((unsigned int)retry_interval);
2342
}
2343
2344
if(not quit_now){
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2345
1523
exitcode = EXIT_SUCCESS;
2346
1524
}
2347
2348
1525
goto end;
2349
1526
}
2350
1527
2362
1539
config.publish_domain = 0;
2363
1540
2364
1541
/* Allocate a new server */
2365
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
2367
1545
2368
1546
/* Free the Avahi configuration data */
2369
1547
avahi_server_config_free(&config);
2371
1549
2372
1550
/* Check if creating the Avahi server object succeeded */
2373
1551
if(mc.server == NULL){
2374
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2375
avahi_strerror(ret_errno));
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
2376
1554
exitcode = EX_UNAVAILABLE;
2377
1555
goto end;
2378
1556
}
2384
1562
/* Create the Avahi service browser */
2385
1563
sb = avahi_s_service_browser_new(mc.server, if_index,
2386
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2387
NULL, 0, browse_callback,
2388
(void *)&mc);
1565
NULL, 0, browse_callback, NULL);
2389
1566
if(sb == NULL){
2390
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2391
avahi_strerror(avahi_server_errno(mc.server)));
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
2392
1569
exitcode = EX_UNAVAILABLE;
2393
1570
goto end;
2394
1571
}
2400
1577
/* Run the main loop */
2401
1578
2402
1579
if(debug){
2403
fprintf_plus(stderr, "Starting Avahi loop search\n");
2404
}
2405
2406
ret = avahi_loop_with_timeout(simple_poll,
2407
(int)(retry_interval * 1000), &mc);
2408
if(debug){
2409
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2410
(ret == 0) ? "successfully" : "with error");
2411
}
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2412
1584
2413
1585
end:
2414
1586
2415
1587
if(debug){
2416
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2417
1589
}
2418
1590
2419
1591
/* Cleanup things */
2420
free(mc.interfaces);
2421
2422
1592
if(sb != NULL)
2423
1593
avahi_s_service_browser_free(sb);
2424
1594
2425
1595
if(mc.server != NULL)
2426
1596
avahi_server_free(mc.server);
2427
1597
2428
if(simple_poll != NULL)
2429
avahi_simple_poll_free(simple_poll);
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
2430
1600
2431
1601
if(gnutls_initialized){
2432
1602
gnutls_certificate_free_credentials(mc.cred);
2438
1608
gpgme_release(mc.ctx);
2439
1609
}
2440
1610
2441
/* Cleans up the circular linked list of Mandos servers the client
2442
has seen */
2443
if(mc.current_server != NULL){
2444
mc.current_server->prev->next = NULL;
2445
while(mc.current_server != NULL){
2446
server *next = mc.current_server->next;
2447
free(mc.current_server);
2448
mc.current_server = next;
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
2449
1618
}
2450
}
2451
2452
/* Re-raise priviliges */
2453
{
2454
raise_privileges();
2455
2456
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2459
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
2470
1628
}
2471
1629
}
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
2475
1639
}
2476
1640
}
2477
2478
lower_privileges_permanently();
2479
1641
}
2480
1642
2481
free(interfaces_to_take_down);
2482
free(interfaces_hooks);
2483
2484
/* Removes the GPGME temp directory and all files inside */
1643
/* Removes the temp directory used by GPGME */
2485
1644
if(tempdir_created){
2486
struct dirent **direntries = NULL;
2487
struct dirent *direntry = NULL;
2488
int numentries = scandir(tempdir, &direntries, notdotentries,
2489
alphasort);
2490
if(numentries > 0){
2491
for(int i = 0; i < numentries; i++){
2492
direntry = direntries[i];
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
2493
1665
char *fullname = NULL;
2494
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
2495
1667
direntry->d_name);
2496
1668
if(ret < 0){
2497
perror_plus("asprintf");
1669
perror("asprintf");
2498
1670
continue;
2499
1671
}
2500
1672
ret = remove(fullname);
2501
1673
if(ret == -1){
2502
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2503
strerror(errno));
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2504
1676
}
2505
1677
free(fullname);
2506
1678
}
2507
}
2508
2509
/* need to clean even if 0 because man page doesn't specify */
2510
free(direntries);
2511
if(numentries == -1){
2512
perror_plus("scandir");
1679
closedir(d);
2513
1680
}
2514
1681
ret = rmdir(tempdir);
2515
1682
if(ret == -1 and errno != ENOENT){
2516
perror_plus("rmdir");
1683
perror("rmdir");
2517
1684
}
2518
1685
}
2519
1686
2524
1691
&old_sigterm_action,
2525
1692
NULL));
2526
1693
if(ret == -1){
2527
perror_plus("sigaction");
1694
perror("sigaction");
2528
1695
}
2529
1696
do {
2530
1697
ret = raise(signal_received);
2531
1698
} while(ret != 0 and errno == EINTR);
2532
1699
if(ret != 0){
2533
perror_plus("raise");
1700
perror("raise");
2534
1701
abort();
2535
1702
}
2536
1703
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0