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237.2.169
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-11-09 07:35:16 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-20091109073516-v1vem352uz0vuwrd
* dbus-mandos.conf: New; to be copied to
"/etc/dbus-1/system.d/mandos.conf".
"/etc/dbus-1/system.d/mandos.conf".
- 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
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
69
69
if_nametoindex(), IF_NAMESIZE */
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
77
#include <iso646.h> /* not, or, and */
78
78
#include <argp.h> /* struct argp_option, error_t, struct
79
79
argp_state, struct argp,
84
84
raise() */
85
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
94
87
95
88
#ifdef __linux__
96
89
#include <sys/klog.h> /* klogctl() */
114
107
init_gnutls_session(),
115
108
GNUTLS_* */
116
109
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
119
112
120
113
/* GPGME */
121
114
#include <gpgme.h> /* All GPGME types, constants and
129
122
#define PATHDIR "/conf/conf.d/mandos"
130
123
#define SECKEY "seckey.txt"
131
124
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
125
134
126
bool debug = false;
135
127
static const char mandos_protocol_version[] = "1";
136
128
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
154
130
155
131
/* Used for passing in values through the Avahi callback functions */
156
132
typedef struct {
133
AvahiSimplePoll *simple_poll;
157
134
AvahiServer *server;
158
135
gnutls_certificate_credentials_t cred;
159
136
unsigned int dh_bits;
160
137
gnutls_dh_params_t dh_params;
161
138
const char *priority;
162
139
gpgme_ctx_t ctx;
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
140
} mandos_context;
167
141
168
/* global so signal handler can reach it*/
169
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" };
170
146
171
147
sig_atomic_t quit_now = 0;
172
148
int signal_received = 0;
173
149
174
/* Function to use when printing errors */
175
void perror_plus(const char *print_text){
176
int e = errno;
177
fprintf(stderr, "Mandos plugin %s: ",
178
program_invocation_short_name);
179
errno = e;
180
perror(print_text);
181
}
182
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_list ap;
186
va_start (ap, format);
187
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
193
150
/*
194
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
152
* bytes. "buffer_capacity" is how much is currently allocated,
196
153
* "buffer_length" is how much is already used.
197
154
*/
198
155
size_t incbuffer(char **buffer, size_t buffer_length,
199
size_t buffer_capacity){
156
size_t buffer_capacity){
200
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
159
if(buffer == NULL){
207
164
return buffer_capacity;
208
165
}
209
166
210
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
213
int ret;
214
server *new_server = malloc(sizeof(server));
215
if(new_server == NULL){
216
perror_plus("malloc");
217
return false;
218
}
219
*new_server = (server){ .ip = strdup(ip),
220
.port = port,
221
.if_index = if_index,
222
.af = af };
223
if(new_server->ip == NULL){
224
perror_plus("strdup");
225
return false;
226
}
227
/* Special case of first server */
228
if(*current_server == NULL){
229
new_server->next = new_server;
230
new_server->prev = new_server;
231
*current_server = new_server;
232
/* Place the new server last in the list */
233
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
236
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
return true;
245
}
246
247
167
/*
248
168
* Initialize GPGME.
249
169
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
252
172
gpgme_error_t rc;
253
173
gpgme_engine_info_t engine_info;
254
174
175
255
176
/*
256
177
* Helper function to insert pub and seckey to the engine keyring.
257
178
*/
262
183
263
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
185
if(fd == -1){
265
perror_plus("open");
186
perror("open");
266
187
return false;
267
188
}
268
189
269
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
191
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
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));
273
194
return false;
274
195
}
275
196
276
rc = gpgme_op_import(mc->ctx, pgp_data);
197
rc = gpgme_op_import(mc.ctx, pgp_data);
277
198
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
280
201
return false;
281
202
}
282
203
283
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
284
205
if(ret == -1){
285
perror_plus("close");
206
perror("close");
286
207
}
287
208
gpgme_data_release(pgp_data);
288
209
return true;
289
210
}
290
211
291
212
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
213
fprintf(stderr, "Initializing GPGME\n");
293
214
}
294
215
295
216
/* Init GPGME */
296
217
gpgme_check_version(NULL);
297
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
219
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
301
222
return false;
302
223
}
303
224
304
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
305
226
rc = gpgme_get_engine_info(&engine_info);
306
227
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
309
230
return false;
310
231
}
311
232
while(engine_info != NULL){
317
238
engine_info = engine_info->next;
318
239
}
319
240
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
322
242
return false;
323
243
}
324
244
325
245
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
246
rc = gpgme_new(&(mc.ctx));
327
247
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
331
250
return false;
332
251
}
333
252
344
263
*/
345
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
265
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
266
char **plaintext){
349
267
gpgme_data_t dh_crypto, dh_plain;
350
268
gpgme_error_t rc;
351
269
ssize_t ret;
353
271
ssize_t plaintext_length = 0;
354
272
355
273
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
357
275
}
358
276
359
277
/* Create new GPGME data buffer from memory cryptotext */
360
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
361
279
0);
362
280
if(rc != GPG_ERR_NO_ERROR){
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
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));
365
283
return -1;
366
284
}
367
285
368
286
/* Create new empty GPGME data buffer for the plaintext */
369
287
rc = gpgme_data_new(&dh_plain);
370
288
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
374
291
gpgme_data_release(dh_crypto);
375
292
return -1;
376
293
}
377
294
378
295
/* Decrypt data from the cryptotext data buffer to the plaintext
379
296
data buffer */
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
298
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
384
301
plaintext_length = -1;
385
302
if(debug){
386
303
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
304
result = gpgme_op_decrypt_result(mc.ctx);
388
305
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
390
307
} else {
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
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);
395
312
if(result->file_name != NULL){
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
313
fprintf(stderr, "File name: %s\n", result->file_name);
397
314
}
398
315
gpgme_recipient_t recipient;
399
316
recipient = result->recipients;
400
317
while(recipient != NULL){
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "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");
408
324
recipient = recipient->next;
409
325
}
410
326
}
413
329
}
414
330
415
331
if(debug){
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
333
}
418
334
419
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
422
338
plaintext_length = -1;
423
339
goto decrypt_end;
424
340
}
426
342
*plaintext = NULL;
427
343
while(true){
428
344
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
345
(size_t)plaintext_length,
346
plaintext_capacity);
431
347
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
435
351
}
436
352
437
353
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
442
358
break;
443
359
}
444
360
if(ret < 0){
445
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
446
362
plaintext_length = -1;
447
363
goto decrypt_end;
448
364
}
450
366
}
451
367
452
368
if(debug){
453
fprintf_plus(stderr, "Decrypted password is: ");
369
fprintf(stderr, "Decrypted password is: ");
454
370
for(ssize_t i = 0; i < plaintext_length; i++){
455
371
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
372
}
468
384
}
469
385
470
386
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
472
389
if(ret == NULL)
473
390
ret = "(unknown)";
474
391
return ret;
477
394
/* GnuTLS log function callback */
478
395
static void debuggnutls(__attribute__((unused)) int level,
479
396
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
397
fprintf(stderr, "GnuTLS: %s", string);
481
398
}
482
399
483
400
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
401
const char *seckeyfilename){
486
402
int ret;
487
403
488
404
if(debug){
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
405
fprintf(stderr, "Initializing GnuTLS\n");
490
406
}
491
407
492
408
ret = gnutls_global_init();
493
409
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
496
412
return -1;
497
413
}
498
414
505
421
}
506
422
507
423
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
509
425
if(ret != GNUTLS_E_SUCCESS){
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
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));
512
431
gnutls_global_deinit();
513
432
return -1;
514
433
}
515
434
516
435
if(debug){
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
521
439
}
522
440
523
441
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
442
(mc.cred, pubkeyfilename, seckeyfilename,
525
443
GNUTLS_OPENPGP_FMT_BASE64);
526
444
if(ret != GNUTLS_E_SUCCESS){
527
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
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));
532
450
goto globalfail;
533
451
}
534
452
535
453
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
454
ret = gnutls_dh_params_init(&mc.dh_params);
537
455
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
541
458
goto globalfail;
542
459
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
461
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
547
464
goto globalfail;
548
465
}
549
466
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
551
468
552
469
return 0;
553
470
554
471
globalfail:
555
472
556
gnutls_certificate_free_credentials(mc->cred);
473
gnutls_certificate_free_credentials(mc.cred);
557
474
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
475
gnutls_dh_params_deinit(mc.dh_params);
559
476
return -1;
560
477
}
561
478
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
479
static int init_gnutls_session(gnutls_session_t *session){
564
480
int ret;
565
481
/* GnuTLS session creation */
566
482
do {
570
486
}
571
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
572
488
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
576
491
}
577
492
578
493
{
579
494
const char *err;
580
495
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
497
if(quit_now){
583
498
gnutls_deinit(*session);
584
499
return -1;
585
500
}
586
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
587
502
if(ret != GNUTLS_E_SUCCESS){
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
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));
591
506
gnutls_deinit(*session);
592
507
return -1;
593
508
}
595
510
596
511
do {
597
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
513
mc.cred);
599
514
if(quit_now){
600
515
gnutls_deinit(*session);
601
516
return -1;
602
517
}
603
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
604
519
if(ret != GNUTLS_E_SUCCESS){
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
607
522
gnutls_deinit(*session);
608
523
return -1;
609
524
}
611
526
/* ignore client certificate if any. */
612
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
528
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
530
616
531
return 0;
617
532
}
621
536
__attribute__((unused)) const char *txt){}
622
537
623
538
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
539
static int start_mandos_communication(const char *ip, uint16_t port,
625
540
AvahiIfIndex if_index,
626
int af, mandos_context *mc){
541
int af){
627
542
int ret, tcp_sd = -1;
628
543
ssize_t sret;
629
544
union {
654
569
pf = PF_INET;
655
570
break;
656
571
default:
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
572
fprintf(stderr, "Bad address family: %d\n", af);
658
573
errno = EINVAL;
659
574
return -1;
660
575
}
661
576
662
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
690
return -1;
691
}
692
}
693
694
ret = init_gnutls_session(&session, mc);
577
ret = init_gnutls_session(&session);
695
578
if(ret != 0){
696
579
return -1;
697
580
}
698
581
699
582
if(debug){
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
702
585
}
703
586
704
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
705
588
if(tcp_sd < 0){
706
589
int e = errno;
707
perror_plus("socket");
590
perror("socket");
708
591
errno = e;
709
592
goto mandos_end;
710
593
}
724
607
}
725
608
if(ret < 0 ){
726
609
int e = errno;
727
perror_plus("inet_pton");
610
perror("inet_pton");
728
611
errno = e;
729
612
goto mandos_end;
730
613
}
731
614
if(ret == 0){
732
615
int e = errno;
733
fprintf_plus(stderr, "Bad address: %s\n", ip);
616
fprintf(stderr, "Bad address: %s\n", ip);
734
617
errno = e;
735
618
goto mandos_end;
736
619
}
737
620
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
743
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
748
628
if(if_index == AVAHI_IF_UNSPEC){
749
fprintf_plus(stderr, "An IPv6 link-local address is"
750
" incomplete without a network interface\n");
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
751
631
errno = EINVAL;
752
632
goto mandos_end;
753
633
}
755
635
to.in6.sin6_scope_id = (uint32_t)if_index;
756
636
}
757
637
} else {
758
to.in.sin_port = htons(port);
638
to.in.sin_port = htons(port); /* Spurious warnings from
639
-Wconversion and
640
-Wunreachable-code */
759
641
}
760
642
761
643
if(quit_now){
767
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
768
650
char interface[IF_NAMESIZE];
769
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
770
perror_plus("if_indextoname");
652
perror("if_indextoname");
771
653
} else {
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
774
656
}
775
657
} else {
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
778
660
}
779
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
780
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
787
669
sizeof(addrstr));
788
670
}
789
671
if(pcret == NULL){
790
perror_plus("inet_ntop");
672
perror("inet_ntop");
791
673
} else {
792
674
if(strcmp(addrstr, ip) != 0){
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
794
676
}
795
677
}
796
678
}
806
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
807
689
}
808
690
if(ret < 0){
809
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
810
int e = errno;
811
perror_plus("connect");
812
errno = e;
813
}
691
int e = errno;
692
perror("connect");
693
errno = e;
814
694
goto mandos_end;
815
695
}
816
696
824
704
while(true){
825
705
size_t out_size = strlen(out);
826
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
827
out_size - written));
707
out_size - written));
828
708
if(ret == -1){
829
709
int e = errno;
830
perror_plus("write");
710
perror("write");
831
711
errno = e;
832
712
goto mandos_end;
833
713
}
850
730
}
851
731
852
732
if(debug){
853
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
854
734
}
855
735
856
736
if(quit_now){
858
738
goto mandos_end;
859
739
}
860
740
861
/* This casting via intptr_t is to eliminate warning about casting
862
an int to a pointer type. This is exactly how the GnuTLS Guile
863
function "set-session-transport-fd!" does it. */
864
gnutls_transport_set_ptr(session,
865
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
866
742
867
743
if(quit_now){
868
744
errno = EINTR;
879
755
880
756
if(ret != GNUTLS_E_SUCCESS){
881
757
if(debug){
882
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
883
759
gnutls_perror(ret);
884
760
}
885
761
errno = EPROTO;
889
765
/* Read OpenPGP packet that contains the wanted password */
890
766
891
767
if(debug){
892
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
893
" %s\n", ip);
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
894
770
}
895
771
896
772
while(true){
901
777
}
902
778
903
779
buffer_capacity = incbuffer(&buffer, buffer_length,
904
buffer_capacity);
780
buffer_capacity);
905
781
if(buffer_capacity == 0){
906
782
int e = errno;
907
perror_plus("incbuffer");
783
perror("incbuffer");
908
784
errno = e;
909
785
goto mandos_end;
910
786
}
934
810
}
935
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
936
812
if(ret < 0){
937
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
938
"***\n");
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
939
814
gnutls_perror(ret);
940
815
errno = EPROTO;
941
816
goto mandos_end;
942
817
}
943
818
break;
944
819
default:
945
fprintf_plus(stderr, "Unknown error while reading data from"
946
" encrypted session with Mandos server\n");
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
947
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
948
823
errno = EIO;
949
824
goto mandos_end;
954
829
}
955
830
956
831
if(debug){
957
fprintf_plus(stderr, "Closing TLS session\n");
832
fprintf(stderr, "Closing TLS session\n");
958
833
}
959
834
960
835
if(quit_now){
972
847
973
848
if(buffer_length > 0){
974
849
ssize_t decrypted_buffer_size;
975
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
976
&decrypted_buffer, mc);
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
852
&decrypted_buffer);
977
853
if(decrypted_buffer_size >= 0){
978
854
979
855
written = 0;
989
865
if(ret == 0 and ferror(stdout)){
990
866
int e = errno;
991
867
if(debug){
992
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
993
strerror(errno));
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
994
870
}
995
871
errno = e;
996
872
goto mandos_end;
1015
891
if(e == 0){
1016
892
e = errno;
1017
893
}
1018
perror_plus("close");
894
perror("close");
1019
895
}
1020
896
gnutls_deinit(session);
1021
errno = e;
1022
897
if(quit_now){
1023
errno = EINTR;
898
e = EINTR;
1024
899
retval = -1;
1025
900
}
901
errno = e;
1026
902
}
1027
903
return retval;
1028
904
}
1040
916
AVAHI_GCC_UNUSED AvahiStringList *txt,
1041
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1042
918
flags,
1043
void* mc){
1044
if(r == NULL){
1045
return;
1046
}
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(r);
1047
921
1048
922
/* Called whenever a service has been resolved successfully or
1049
923
timed out */
1055
929
switch(event){
1056
930
default:
1057
931
case AVAHI_RESOLVER_FAILURE:
1058
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1059
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1060
domain,
1061
avahi_strerror(avahi_server_errno
1062
(((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)));
1063
935
break;
1064
936
1065
937
case AVAHI_RESOLVER_FOUND:
1067
939
char ip[AVAHI_ADDRESS_STR_MAX];
1068
940
avahi_address_snprint(ip, sizeof(ip), address);
1069
941
if(debug){
1070
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1071
PRIdMAX ") on port %" PRIu16 "\n", name,
1072
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);
1073
945
}
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1075
interface,
1076
avahi_proto_to_af(proto),
1077
mc);
946
int ret = start_mandos_communication(ip, port, interface,
947
avahi_proto_to_af(proto));
1078
948
if(ret == 0){
1079
avahi_simple_poll_quit(simple_poll);
1080
} else {
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1084
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1085
" list\n", name);
1086
}
949
avahi_simple_poll_quit(mc.simple_poll);
1087
950
}
1088
951
}
1089
952
}
1099
962
const char *domain,
1100
963
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1101
964
flags,
1102
void* mc){
1103
if(b == NULL){
1104
return;
1105
}
965
AVAHI_GCC_UNUSED void* userdata){
966
assert(b);
1106
967
1107
968
/* Called whenever a new services becomes available on the LAN or
1108
969
is removed from the LAN */
1115
976
default:
1116
977
case AVAHI_BROWSER_FAILURE:
1117
978
1118
fprintf_plus(stderr, "(Avahi browser) %s\n",
1119
avahi_strerror(avahi_server_errno
1120
(((mandos_context*)mc)->server)));
1121
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);
1122
982
return;
1123
983
1124
984
case AVAHI_BROWSER_NEW:
1127
987
the callback function is called the Avahi server will free the
1128
988
resolver for us. */
1129
989
1130
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1131
interface, protocol, name, type,
1132
domain, protocol, 0,
1133
resolve_callback, mc) == NULL)
1134
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1135
" %s\n", name,
1136
avahi_strerror(avahi_server_errno
1137
(((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)));
1138
995
break;
1139
996
1140
997
case AVAHI_BROWSER_REMOVE:
1143
1000
case AVAHI_BROWSER_ALL_FOR_NOW:
1144
1001
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1145
1002
if(debug){
1146
fprintf_plus(stderr, "No Mandos server found, still"
1147
" searching...\n");
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1148
1004
}
1149
1005
break;
1150
1006
}
1151
1007
}
1152
1008
1153
/* Signal handler that stops main loop after SIGTERM */
1009
/* stop main loop after sigterm has been called */
1154
1010
static void handle_sigterm(int sig){
1155
1011
if(quit_now){
1156
1012
return;
1158
1014
quit_now = 1;
1159
1015
signal_received = sig;
1160
1016
int old_errno = errno;
1161
/* set main loop to exit */
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1164
}
1165
errno = old_errno;
1166
}
1167
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1169
int ret;
1170
error_t ret_errno;
1171
1172
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1173
if(s < 0){
1174
ret_errno = errno;
1175
perror_plus("socket");
1176
errno = ret_errno;
1177
return false;
1178
}
1179
strcpy(ifr->ifr_name, ifname);
1180
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1181
if(ret == -1){
1182
if(debug){
1183
ret_errno = errno;
1184
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1186
}
1187
return false;
1188
}
1189
return true;
1190
}
1191
1192
bool good_flags(const char *ifname, const struct ifreq *ifr){
1193
1194
/* Reject the loopback device */
1195
if(ifr->ifr_flags & IFF_LOOPBACK){
1196
if(debug){
1197
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1198
ifname);
1199
}
1200
return false;
1201
}
1202
/* Accept point-to-point devices only if connect_to is specified */
1203
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1204
if(debug){
1205
fprintf_plus(stderr, "Accepting point-to-point interface"
1206
" \"%s\"\n", ifname);
1207
}
1208
return true;
1209
}
1210
/* Otherwise, reject non-broadcast-capable devices */
1211
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1212
if(debug){
1213
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1214
" \"%s\"\n", ifname);
1215
}
1216
return false;
1217
}
1218
/* Reject non-ARP interfaces (including dummy interfaces) */
1219
if(ifr->ifr_flags & IFF_NOARP){
1220
if(debug){
1221
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1222
ifname);
1223
}
1224
return false;
1225
}
1226
1227
/* Accept this device */
1228
if(debug){
1229
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1230
}
1231
return true;
1232
}
1233
1234
/*
1235
* This function determines if a directory entry in /sys/class/net
1236
* corresponds to an acceptable network device.
1237
* (This function is passed to scandir(3) as a filter function.)
1238
*/
1239
int good_interface(const struct dirent *if_entry){
1240
if(if_entry->d_name[0] == '.'){
1241
return 0;
1242
}
1243
1244
struct ifreq ifr;
1245
if(not get_flags(if_entry->d_name, &ifr)){
1246
if(debug){
1247
fprintf_plus(stderr, "Failed to get flags for interface "
1248
"\"%s\"\n", if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
if(not good_flags(if_entry->d_name, &ifr)){
1254
return 0;
1255
}
1256
return 1;
1257
}
1258
1259
/*
1260
* This function determines if a network interface is up.
1261
*/
1262
bool interface_is_up(const char *interface){
1263
struct ifreq ifr;
1264
if(not get_flags(interface, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", interface);
1268
}
1269
return false;
1270
}
1271
1272
return (bool)(ifr.ifr_flags & IFF_UP);
1273
}
1274
1275
/*
1276
* This function determines if a network interface is running
1277
*/
1278
bool interface_is_running(const char *interface){
1279
struct ifreq ifr;
1280
if(not get_flags(interface, &ifr)){
1281
if(debug){
1282
fprintf_plus(stderr, "Failed to get flags for interface "
1283
"\"%s\"\n", interface);
1284
}
1285
return false;
1286
}
1287
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1289
}
1290
1291
int notdotentries(const struct dirent *direntry){
1292
/* Skip "." and ".." */
1293
if(direntry->d_name[0] == '.'
1294
and (direntry->d_name[1] == '\0'
1295
or (direntry->d_name[1] == '.'
1296
and direntry->d_name[2] == '\0'))){
1297
return 0;
1298
}
1299
return 1;
1300
}
1301
1302
/* Is this directory entry a runnable program? */
1303
int runnable_hook(const struct dirent *direntry){
1304
int ret;
1305
size_t sret;
1306
struct stat st;
1307
1308
if((direntry->d_name)[0] == '\0'){
1309
/* Empty name? */
1310
return 0;
1311
}
1312
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1314
"abcdefghijklmnopqrstuvwxyz"
1315
"0123456789"
1316
"_-");
1317
if((direntry->d_name)[sret] != '\0'){
1318
/* Contains non-allowed characters */
1319
if(debug){
1320
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1321
direntry->d_name);
1322
}
1323
return 0;
1324
}
1325
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1328
if(ret < 0){
1329
perror_plus("asprintf");
1330
return 0;
1331
}
1332
1333
ret = stat(fullname, &st);
1334
if(ret == -1){
1335
if(debug){
1336
perror_plus("Could not stat hook");
1337
}
1338
return 0;
1339
}
1340
if(not (S_ISREG(st.st_mode))){
1341
/* Not a regular file */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1349
/* Not executable */
1350
if(debug){
1351
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1352
direntry->d_name);
1353
}
1354
return 0;
1355
}
1356
if(debug){
1357
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1358
direntry->d_name);
1359
}
1360
return 1;
1361
}
1362
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1365
int ret;
1366
struct timespec now;
1367
struct timespec waited_time;
1368
intmax_t block_time;
1369
1370
while(true){
1371
if(mc->current_server == NULL){
1372
if (debug){
1373
fprintf_plus(stderr, "Wait until first server is found."
1374
" No timeout!\n");
1375
}
1376
ret = avahi_simple_poll_iterate(s, -1);
1377
} else {
1378
if (debug){
1379
fprintf_plus(stderr, "Check current_server if we should run"
1380
" it, or wait\n");
1381
}
1382
/* the current time */
1383
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1384
if(ret == -1){
1385
perror_plus("clock_gettime");
1386
return -1;
1387
}
1388
/* Calculating in ms how long time between now and server
1389
who we visted longest time ago. Now - last seen. */
1390
waited_time.tv_sec = (now.tv_sec
1391
- mc->current_server->last_seen.tv_sec);
1392
waited_time.tv_nsec = (now.tv_nsec
1393
- mc->current_server->last_seen.tv_nsec);
1394
/* total time is 10s/10,000ms.
1395
Converting to s from ms by dividing by 1,000,
1396
and ns to ms by dividing by 1,000,000. */
1397
block_time = ((retry_interval
1398
- ((intmax_t)waited_time.tv_sec * 1000))
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
1400
1401
if (debug){
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1403
block_time);
1404
}
1405
1406
if(block_time <= 0){
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
mc->current_server->af, mc);
1411
if(ret == 0){
1412
avahi_simple_poll_quit(s);
1413
return 0;
1414
}
1415
ret = clock_gettime(CLOCK_MONOTONIC,
1416
&mc->current_server->last_seen);
1417
if(ret == -1){
1418
perror_plus("clock_gettime");
1419
return -1;
1420
}
1421
mc->current_server = mc->current_server->next;
1422
block_time = 0; /* Call avahi to find new Mandos
1423
servers, but don't block */
1424
}
1425
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
1427
}
1428
if(ret != 0){
1429
if (ret > 0 or errno != EINTR){
1430
return (ret != 1) ? ret : 0;
1431
}
1432
}
1433
}
1434
}
1435
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
1489
const float delay){
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
1495
if(numhooks == -1){
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
1503
}
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
1511
perror_plus("asprintf");
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
free(delaystring);
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
1582
} else {
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
1619
}
1620
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1627
struct ifreq network;
1628
unsigned int if_index = if_nametoindex(interface);
1629
if(if_index == 0){
1630
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1631
errno = old_errno;
1632
return ENXIO;
1633
}
1634
1635
if(quit_now){
1636
errno = old_errno;
1637
return EINTR;
1638
}
1639
1640
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
1642
ret_errno = errno;
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1644
"\"%s\"\n", interface);
1645
return ret_errno;
1646
}
1647
network.ifr_flags |= IFF_UP;
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
ret_errno = errno;
1652
perror_plus("socket");
1653
errno = old_errno;
1654
return ret_errno;
1655
}
1656
1657
if(quit_now){
1658
close(sd);
1659
errno = old_errno;
1660
return EINTR;
1661
}
1662
1663
if(debug){
1664
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1665
interface);
1666
}
1667
1668
/* Raise priviliges */
1669
raise_privileges();
1670
1671
#ifdef __linux__
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
1679
}
1680
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1683
#ifdef __linux__
1684
if(restore_loglevel){
1685
ret_linux = klogctl(7, NULL, 0);
1686
if(ret_linux == -1){
1687
perror_plus("klogctl");
1688
}
1689
}
1690
#endif /* __linux__ */
1691
1692
/* Lower privileges */
1693
lower_privileges();
1694
1695
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1697
if(ret == -1){
1698
perror_plus("close");
1699
}
1700
1701
if(ret_setflags == -1){
1702
errno = ret_errno;
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
} else if(debug){
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1709
interface);
1710
}
1711
1712
/* Sleep checking until interface is running.
1713
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
1715
if(interface_is_running(interface)){
1716
break;
1717
}
1718
struct timespec sleeptime = { .tv_nsec = 250000000 };
1719
ret = nanosleep(&sleeptime, NULL);
1720
if(ret == -1 and errno != EINTR){
1721
perror_plus("nanosleep");
1722
}
1723
}
1724
1725
errno = old_errno;
1726
return 0;
1727
}
1728
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
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
if(not get_flags(interface, &network) and debug){
1743
ret_errno = errno;
1744
fprintf_plus(stderr, "Failed to get flags for interface "
1745
"\"%s\"\n", interface);
1746
return ret_errno;
1747
}
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1749
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
1752
ret_errno = errno;
1753
perror_plus("socket");
1754
errno = old_errno;
1755
return ret_errno;
1756
}
1757
1758
if(debug){
1759
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1760
interface);
1761
}
1762
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ret_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1781
errno = old_errno;
1782
return ret_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1786
interface);
1787
}
1788
1789
errno = old_errno;
1790
return 0;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1791
1021
}
1792
1022
1793
1023
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
1798
1024
AvahiSServiceBrowser *sb = NULL;
1799
error_t ret_errno;
1025
int error;
1800
1026
int ret;
1801
1027
intmax_t tmpmax;
1802
1028
char *tmp;
1803
1029
int exitcode = EXIT_SUCCESS;
1804
char *interfaces_to_take_down = NULL;
1805
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;
1806
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1807
1038
bool tempdir_created = false;
1808
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1809
1040
const char *seckey = PATHDIR "/" SECKEY;
1810
1041
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
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
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
2081
}
2082
1195
2083
1196
if(not debug){
2084
1197
avahi_set_log_function(empty_log);
2088
1201
from the signal handler */
2089
1202
/* Initialize the pseudo-RNG for Avahi */
2090
1203
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"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");
2095
1207
exitcode = EX_UNAVAILABLE;
2096
1208
goto end;
2097
1209
}
2099
1211
sigemptyset(&sigterm_action.sa_mask);
2100
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2101
1213
if(ret == -1){
2102
perror_plus("sigaddset");
1214
perror("sigaddset");
2103
1215
exitcode = EX_OSERR;
2104
1216
goto end;
2105
1217
}
2106
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2107
1219
if(ret == -1){
2108
perror_plus("sigaddset");
1220
perror("sigaddset");
2109
1221
exitcode = EX_OSERR;
2110
1222
goto end;
2111
1223
}
2112
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2113
1225
if(ret == -1){
2114
perror_plus("sigaddset");
1226
perror("sigaddset");
2115
1227
exitcode = EX_OSERR;
2116
1228
goto end;
2117
1229
}
2121
1233
*/
2122
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2123
1235
if(ret == -1){
2124
perror_plus("sigaction");
1236
perror("sigaction");
2125
1237
return EX_OSERR;
2126
1238
}
2127
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
2128
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
2129
1241
if(ret == -1){
2130
perror_plus("sigaction");
1242
perror("sigaction");
2131
1243
exitcode = EX_OSERR;
2132
1244
goto end;
2133
1245
}
2134
1246
}
2135
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2136
1248
if(ret == -1){
2137
perror_plus("sigaction");
1249
perror("sigaction");
2138
1250
return EX_OSERR;
2139
1251
}
2140
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
2141
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2142
1254
if(ret == -1){
2143
perror_plus("sigaction");
1255
perror("sigaction");
2144
1256
exitcode = EX_OSERR;
2145
1257
goto end;
2146
1258
}
2147
1259
}
2148
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2149
1261
if(ret == -1){
2150
perror_plus("sigaction");
1262
perror("sigaction");
2151
1263
return EX_OSERR;
2152
1264
}
2153
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
2154
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2155
1267
if(ret == -1){
2156
perror_plus("sigaction");
2157
exitcode = EX_OSERR;
2158
goto end;
2159
}
2160
}
2161
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
perror_plus("argz_add");
2175
continue;
2176
}
2177
if(debug){
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
direntries[i]->d_name);
2180
}
2181
}
2182
free(direntries);
2183
} else {
2184
free(direntries);
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2186
exitcode = EXIT_FAILURE;
2187
goto end;
2188
}
2189
}
2190
2191
/* Bring up interfaces which are down, and remove any "none"s */
2192
{
2193
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2195
interface))){
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2200
interface);
2201
interface = NULL;
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
2206
interface);
2207
interface = NULL;
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
1270
goto end;
1271
}
1272
}
1273
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");
2208
1359
}
2209
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){
2210
1377
break;
2211
1378
}
2212
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
2214
if(not interface_was_up){
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2218
} else {
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2222
}
2223
}
2224
}
2225
if(debug and (interfaces_to_take_down == NULL)){
2226
fprintf_plus(stderr, "No interfaces were brought up\n");
2227
}
2228
}
2229
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2232
if(debug){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2234
mc.interfaces);
2235
}
2236
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
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
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
2237
1416
}
2238
1417
2239
1418
if(quit_now){
2240
1419
goto end;
2241
1420
}
2242
1421
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
1422
ret = init_gnutls_global(pubkey, seckey);
2244
1423
if(ret == -1){
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
1424
fprintf(stderr, "init_gnutls_global failed\n");
2246
1425
exitcode = EX_UNAVAILABLE;
2247
1426
goto end;
2248
1427
} else {
2253
1432
goto end;
2254
1433
}
2255
1434
1435
tempdir_created = true;
2256
1436
if(mkdtemp(tempdir) == NULL){
2257
perror_plus("mkdtemp");
1437
tempdir_created = false;
1438
perror("mkdtemp");
2258
1439
goto end;
2259
1440
}
2260
tempdir_created = true;
2261
1441
2262
1442
if(quit_now){
2263
1443
goto end;
2264
1444
}
2265
1445
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2267
fprintf_plus(stderr, "init_gpgme failed\n");
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
2268
1448
exitcode = EX_UNAVAILABLE;
2269
1449
goto end;
2270
1450
} else {
2279
1459
/* Connect directly, do not use Zeroconf */
2280
1460
/* (Mainly meant for debugging) */
2281
1461
char *address = strrchr(connect_to, ':');
2282
2283
1462
if(address == NULL){
2284
fprintf_plus(stderr, "No colon in address\n");
1463
fprintf(stderr, "No colon in address\n");
2285
1464
exitcode = EX_USAGE;
2286
1465
goto end;
2287
1466
}
2290
1469
goto end;
2291
1470
}
2292
1471
2293
in_port_t port;
1472
uint16_t port;
2294
1473
errno = 0;
2295
1474
tmpmax = strtoimax(address+1, &tmp, 10);
2296
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2297
or tmpmax != (in_port_t)tmpmax){
2298
fprintf_plus(stderr, "Bad port number\n");
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2299
1478
exitcode = EX_USAGE;
2300
1479
goto end;
2301
1480
}
2302
1481
2303
1482
if(quit_now){
2304
1483
goto end;
2305
1484
}
2306
1485
2307
port = (in_port_t)tmpmax;
1486
port = (uint16_t)tmpmax;
2308
1487
*address = '\0';
1488
address = connect_to;
2309
1489
/* Colon in address indicates IPv6 */
2310
1490
int af;
2311
if(strchr(connect_to, ':') != NULL){
1491
if(strchr(address, ':') != NULL){
2312
1492
af = AF_INET6;
2313
/* Accept [] around IPv6 address - see RFC 5952 */
2314
if(connect_to[0] == '[' and address[-1] == ']')
2315
{
2316
connect_to++;
2317
address[-1] = '\0';
2318
}
2319
1493
} else {
2320
1494
af = AF_INET;
2321
1495
}
2322
address = connect_to;
2323
1496
2324
1497
if(quit_now){
2325
1498
goto end;
2326
1499
}
2327
1500
2328
while(not quit_now){
2329
ret = start_mandos_communication(address, port, if_index, af,
2330
&mc);
2331
if(quit_now or ret == 0){
2332
break;
2333
}
2334
if(debug){
2335
fprintf_plus(stderr, "Retrying in %d seconds\n",
2336
(int)retry_interval);
2337
}
2338
sleep((unsigned int)retry_interval);
2339
}
2340
2341
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 {
2342
1523
exitcode = EXIT_SUCCESS;
2343
1524
}
2344
2345
1525
goto end;
2346
1526
}
2347
1527
2359
1539
config.publish_domain = 0;
2360
1540
2361
1541
/* Allocate a new server */
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
2364
1545
2365
1546
/* Free the Avahi configuration data */
2366
1547
avahi_server_config_free(&config);
2368
1549
2369
1550
/* Check if creating the Avahi server object succeeded */
2370
1551
if(mc.server == NULL){
2371
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2372
avahi_strerror(ret_errno));
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
2373
1554
exitcode = EX_UNAVAILABLE;
2374
1555
goto end;
2375
1556
}
2381
1562
/* Create the Avahi service browser */
2382
1563
sb = avahi_s_service_browser_new(mc.server, if_index,
2383
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2384
NULL, 0, browse_callback,
2385
(void *)&mc);
1565
NULL, 0, browse_callback, NULL);
2386
1566
if(sb == NULL){
2387
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2388
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)));
2389
1569
exitcode = EX_UNAVAILABLE;
2390
1570
goto end;
2391
1571
}
2397
1577
/* Run the main loop */
2398
1578
2399
1579
if(debug){
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
2401
}
2402
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
2405
if(debug){
2406
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2407
(ret == 0) ? "successfully" : "with error");
2408
}
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2409
1584
2410
1585
end:
2411
1586
2412
1587
if(debug){
2413
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2414
1589
}
2415
1590
2416
1591
/* Cleanup things */
2417
free(mc.interfaces);
2418
2419
1592
if(sb != NULL)
2420
1593
avahi_s_service_browser_free(sb);
2421
1594
2422
1595
if(mc.server != NULL)
2423
1596
avahi_server_free(mc.server);
2424
1597
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
2427
1600
2428
1601
if(gnutls_initialized){
2429
1602
gnutls_certificate_free_credentials(mc.cred);
2435
1608
gpgme_release(mc.ctx);
2436
1609
}
2437
1610
2438
/* Cleans up the circular linked list of Mandos servers the client
2439
has seen */
2440
if(mc.current_server != NULL){
2441
mc.current_server->prev->next = NULL;
2442
while(mc.current_server != NULL){
2443
server *next = mc.current_server->next;
2444
free(mc.current_server);
2445
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");
2446
1618
}
2447
}
2448
2449
/* Re-raise priviliges */
2450
{
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
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");
2467
1628
}
2468
1629
}
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" 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");
2472
1639
}
2473
1640
}
2474
2475
lower_privileges_permanently();
2476
1641
}
2477
1642
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2480
2481
/* Removes the GPGME temp directory and all files inside */
1643
/* Removes the temp directory used by GPGME */
2482
1644
if(tempdir_created){
2483
struct dirent **direntries = NULL;
2484
struct dirent *direntry = NULL;
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2486
alphasort);
2487
if (numentries > 0){
2488
for(int i = 0; i < numentries; i++){
2489
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
}
2490
1665
char *fullname = NULL;
2491
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
2492
1667
direntry->d_name);
2493
1668
if(ret < 0){
2494
perror_plus("asprintf");
1669
perror("asprintf");
2495
1670
continue;
2496
1671
}
2497
1672
ret = remove(fullname);
2498
1673
if(ret == -1){
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2501
1676
}
2502
1677
free(fullname);
2503
1678
}
2504
}
2505
2506
/* need to clean even if 0 because man page doesn't specify */
2507
free(direntries);
2508
if (numentries == -1){
2509
perror_plus("scandir");
1679
closedir(d);
2510
1680
}
2511
1681
ret = rmdir(tempdir);
2512
1682
if(ret == -1 and errno != ENOENT){
2513
perror_plus("rmdir");
1683
perror("rmdir");
2514
1684
}
2515
1685
}
2516
1686
2521
1691
&old_sigterm_action,
2522
1692
NULL));
2523
1693
if(ret == -1){
2524
perror_plus("sigaction");
1694
perror("sigaction");
2525
1695
}
2526
1696
do {
2527
1697
ret = raise(signal_received);
2528
1698
} while(ret != 0 and errno == EINTR);
2529
1699
if(ret != 0){
2530
perror_plus("raise");
1700
perror("raise");
2531
1701
abort();
2532
1702
}
2533
1703
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0