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- Committer: Teddy Hogeborn
- Date: 2012-06-14 17:03:12 UTC
- Revision ID: teddy@recompile.se-20120614170312-pl62gn832v09z4bi
* plugins.d/mandos-client.c: Don't use assert(). Use in_port_t for
port numbers everywhere except the
"resolve_callback" function; its
signature is forced by the signature of
the avahi_s_service_resolver_new
function.
port numbers everywhere except the
"resolve_callback" function; its
signature is forced by the signature of
the avahi_s_service_resolver_new
function.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
43
stdout, ferror(), remove() */
40
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
44
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
50
strerror(), asprintf(), strcpy() */
49
53
sockaddr_in6, PF_INET6,
50
54
SOCK_STREAM, uid_t, gid_t, open(),
51
55
opendir(), DIR */
52
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
53
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
58
inet_pton(), connect() */
55
59
#include <fcntl.h> /* open() */
57
61
*/
58
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
59
63
strtoimax() */
60
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
63
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
68
SIOCSIFFLAGS, if_indextoname(),
65
69
if_nametoindex(), IF_NAMESIZE */
67
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
72
*/
69
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
73
77
#include <iso646.h> /* not, or, and */
74
78
#include <argp.h> /* struct argp_option, error_t, struct
75
79
argp_state, struct argp,
76
80
argp_parse(), ARGP_KEY_ARG,
77
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
82
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
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() */
81
94
82
95
#ifdef __linux__
83
96
#include <sys/klog.h> /* klogctl() */
101
114
init_gnutls_session(),
102
115
GNUTLS_* */
103
116
#include <gnutls/openpgp.h>
104
/* gnutls_certificate_set_openpgp_key_file(),
105
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
106
119
107
120
/* GPGME */
108
121
#include <gpgme.h> /* All GPGME types, constants and
116
129
#define PATHDIR "/conf/conf.d/mandos"
117
130
#define SECKEY "seckey.txt"
118
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
119
133
120
134
bool debug = false;
121
135
static const char mandos_protocol_version[] = "1";
122
136
const char *argp_program_version = "mandos-client " VERSION;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
124
154
125
155
/* Used for passing in values through the Avahi callback functions */
126
156
typedef struct {
131
161
gnutls_dh_params_t dh_params;
132
162
const char *priority;
133
163
gpgme_ctx_t ctx;
164
server *current_server;
134
165
} mandos_context;
135
166
136
167
/* global context so signal handler can reach it*/
137
168
mandos_context mc = { .simple_poll = NULL, .server = NULL,
138
169
.dh_bits = 1024, .priority = "SECURE256"
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
172
173
sig_atomic_t quit_now = 0;
174
int signal_received = 0;
175
176
/* Function to use when printing errors */
177
void perror_plus(const char *print_text){
178
int e = errno;
179
fprintf(stderr, "Mandos plugin %s: ",
180
program_invocation_short_name);
181
errno = e;
182
perror(print_text);
183
}
184
185
__attribute__((format (gnu_printf, 2, 3)))
186
int fprintf_plus(FILE *stream, const char *format, ...){
187
va_list ap;
188
va_start (ap, format);
189
190
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
191
program_invocation_short_name));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
}
140
194
141
195
/*
142
196
* Make additional room in "buffer" for at least BUFFER_SIZE more
144
198
* "buffer_length" is how much is already used.
145
199
*/
146
200
size_t incbuffer(char **buffer, size_t buffer_length,
147
size_t buffer_capacity){
201
size_t buffer_capacity){
148
202
if(buffer_length + BUFFER_SIZE > buffer_capacity){
149
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
150
204
if(buffer == NULL){
155
209
return buffer_capacity;
156
210
}
157
211
212
/* Add server to set of servers to retry periodically */
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
214
int af){
215
int ret;
216
server *new_server = malloc(sizeof(server));
217
if(new_server == NULL){
218
perror_plus("malloc");
219
return false;
220
}
221
*new_server = (server){ .ip = strdup(ip),
222
.port = port,
223
.if_index = if_index,
224
.af = af };
225
if(new_server->ip == NULL){
226
perror_plus("strdup");
227
return false;
228
}
229
/* Special case of first server */
230
if (mc.current_server == NULL){
231
new_server->next = new_server;
232
new_server->prev = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
235
} else {
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
238
new_server->prev->next = new_server;
239
mc.current_server->prev = new_server;
240
}
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
242
if(ret == -1){
243
perror_plus("clock_gettime");
244
return false;
245
}
246
return true;
247
}
248
158
249
/*
159
250
* Initialize GPGME.
160
251
*/
161
static bool init_gpgme(const char *seckey,
162
const char *pubkey, const char *tempdir){
163
int ret;
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
164
254
gpgme_error_t rc;
165
255
gpgme_engine_info_t engine_info;
166
256
169
259
* Helper function to insert pub and seckey to the engine keyring.
170
260
*/
171
261
bool import_key(const char *filename){
262
int ret;
172
263
int fd;
173
264
gpgme_data_t pgp_data;
174
265
175
266
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
176
267
if(fd == -1){
177
perror("open");
268
perror_plus("open");
178
269
return false;
179
270
}
180
271
181
272
rc = gpgme_data_new_from_fd(&pgp_data, fd);
182
273
if(rc != GPG_ERR_NO_ERROR){
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
184
gpgme_strsource(rc), gpgme_strerror(rc));
274
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
185
276
return false;
186
277
}
187
278
188
279
rc = gpgme_op_import(mc.ctx, pgp_data);
189
280
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
192
283
return false;
193
284
}
194
285
195
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
196
287
if(ret == -1){
197
perror("close");
288
perror_plus("close");
198
289
}
199
290
gpgme_data_release(pgp_data);
200
291
return true;
201
292
}
202
293
203
294
if(debug){
204
fprintf(stderr, "Initializing GPGME\n");
295
fprintf_plus(stderr, "Initializing GPGME\n");
205
296
}
206
297
207
298
/* Init GPGME */
208
299
gpgme_check_version(NULL);
209
300
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
210
301
if(rc != GPG_ERR_NO_ERROR){
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
212
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
213
304
return false;
214
305
}
215
306
216
/* Set GPGME home directory for the OpenPGP engine only */
307
/* Set GPGME home directory for the OpenPGP engine only */
217
308
rc = gpgme_get_engine_info(&engine_info);
218
309
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
310
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
221
312
return false;
222
313
}
223
314
while(engine_info != NULL){
229
320
engine_info = engine_info->next;
230
321
}
231
322
if(engine_info == NULL){
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
323
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
324
tempdir);
233
325
return false;
234
326
}
235
327
236
328
/* Create new GPGME "context" */
237
329
rc = gpgme_new(&(mc.ctx));
238
330
if(rc != GPG_ERR_NO_ERROR){
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
333
gpgme_strerror(rc));
241
334
return false;
242
335
}
243
336
245
338
return false;
246
339
}
247
340
248
return true;
341
return true;
249
342
}
250
343
251
344
/*
262
355
ssize_t plaintext_length = 0;
263
356
264
357
if(debug){
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
358
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
266
359
}
267
360
268
361
/* Create new GPGME data buffer from memory cryptotext */
269
362
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
270
363
0);
271
364
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
365
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
274
367
return -1;
275
368
}
276
369
277
370
/* Create new empty GPGME data buffer for the plaintext */
278
371
rc = gpgme_data_new(&dh_plain);
279
372
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
373
fprintf_plus(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_data_new: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
282
376
gpgme_data_release(dh_crypto);
283
377
return -1;
284
378
}
287
381
data buffer */
288
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
289
383
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
292
386
plaintext_length = -1;
293
387
if(debug){
294
388
gpgme_decrypt_result_t result;
295
389
result = gpgme_op_decrypt_result(mc.ctx);
296
390
if(result == NULL){
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
298
392
} else {
299
fprintf(stderr, "Unsupported algorithm: %s\n",
300
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
302
result->wrong_key_usage);
393
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf_plus(stderr, "Wrong key usage: %u\n",
396
result->wrong_key_usage);
303
397
if(result->file_name != NULL){
304
fprintf(stderr, "File name: %s\n", result->file_name);
398
fprintf_plus(stderr, "File name: %s\n", result->file_name);
305
399
}
306
400
gpgme_recipient_t recipient;
307
401
recipient = result->recipients;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
402
while(recipient != NULL){
403
fprintf_plus(stderr, "Public key algorithm: %s\n",
404
gpgme_pubkey_algo_name
405
(recipient->pubkey_algo));
406
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
407
fprintf_plus(stderr, "Secret key available: %s\n",
408
recipient->status == GPG_ERR_NO_SECKEY
409
? "No" : "Yes");
410
recipient = recipient->next;
318
411
}
319
412
}
320
413
}
322
415
}
323
416
324
417
if(debug){
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
418
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
326
419
}
327
420
328
421
/* Seek back to the beginning of the GPGME plaintext data buffer */
329
422
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
330
perror("gpgme_data_seek");
423
perror_plus("gpgme_data_seek");
331
424
plaintext_length = -1;
332
425
goto decrypt_end;
333
426
}
335
428
*plaintext = NULL;
336
429
while(true){
337
430
plaintext_capacity = incbuffer(plaintext,
338
(size_t)plaintext_length,
339
plaintext_capacity);
431
(size_t)plaintext_length,
432
plaintext_capacity);
340
433
if(plaintext_capacity == 0){
341
perror("incbuffer");
342
plaintext_length = -1;
343
goto decrypt_end;
434
perror_plus("incbuffer");
435
plaintext_length = -1;
436
goto decrypt_end;
344
437
}
345
438
346
439
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
351
444
break;
352
445
}
353
446
if(ret < 0){
354
perror("gpgme_data_read");
447
perror_plus("gpgme_data_read");
355
448
plaintext_length = -1;
356
449
goto decrypt_end;
357
450
}
359
452
}
360
453
361
454
if(debug){
362
fprintf(stderr, "Decrypted password is: ");
455
fprintf_plus(stderr, "Decrypted password is: ");
363
456
for(ssize_t i = 0; i < plaintext_length; i++){
364
457
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
365
458
}
377
470
}
378
471
379
472
static const char * safer_gnutls_strerror(int value){
380
const char *ret = gnutls_strerror(value); /* Spurious warning from
381
-Wunreachable-code */
473
const char *ret = gnutls_strerror(value);
382
474
if(ret == NULL)
383
475
ret = "(unknown)";
384
476
return ret;
387
479
/* GnuTLS log function callback */
388
480
static void debuggnutls(__attribute__((unused)) int level,
389
481
const char* string){
390
fprintf(stderr, "GnuTLS: %s", string);
482
fprintf_plus(stderr, "GnuTLS: %s", string);
391
483
}
392
484
393
485
static int init_gnutls_global(const char *pubkeyfilename,
395
487
int ret;
396
488
397
489
if(debug){
398
fprintf(stderr, "Initializing GnuTLS\n");
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
399
491
}
400
492
401
493
ret = gnutls_global_init();
402
494
if(ret != GNUTLS_E_SUCCESS){
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
405
497
return -1;
406
498
}
407
499
414
506
}
415
507
416
508
/* OpenPGP credentials */
417
gnutls_certificate_allocate_credentials(&mc.cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
418
510
if(ret != GNUTLS_E_SUCCESS){
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
512
safer_gnutls_strerror(ret));
424
513
gnutls_global_deinit();
425
514
return -1;
426
515
}
427
516
428
517
if(debug){
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
431
seckeyfilename);
518
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
519
" secret key %s as GnuTLS credentials\n",
520
pubkeyfilename,
521
seckeyfilename);
432
522
}
433
523
434
524
ret = gnutls_certificate_set_openpgp_key_file
435
525
(mc.cred, pubkeyfilename, seckeyfilename,
436
526
GNUTLS_OPENPGP_FMT_BASE64);
437
527
if(ret != GNUTLS_E_SUCCESS){
438
fprintf(stderr,
439
"Error[%d] while reading the OpenPGP key pair ('%s',"
440
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
441
fprintf(stderr, "The GnuTLS error is: %s\n",
442
safer_gnutls_strerror(ret));
528
fprintf_plus(stderr,
529
"Error[%d] while reading the OpenPGP key pair ('%s',"
530
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
531
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
532
safer_gnutls_strerror(ret));
443
533
goto globalfail;
444
534
}
445
535
446
536
/* GnuTLS server initialization */
447
537
ret = gnutls_dh_params_init(&mc.dh_params);
448
538
if(ret != GNUTLS_E_SUCCESS){
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
450
" %s\n", safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
" initialization: %s\n",
541
safer_gnutls_strerror(ret));
451
542
goto globalfail;
452
543
}
453
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
454
545
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
456
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
457
548
goto globalfail;
458
549
}
459
550
472
563
static int init_gnutls_session(gnutls_session_t *session){
473
564
int ret;
474
565
/* GnuTLS session creation */
475
ret = gnutls_init(session, GNUTLS_SERVER);
566
do {
567
ret = gnutls_init(session, GNUTLS_SERVER);
568
if(quit_now){
569
return -1;
570
}
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
476
572
if(ret != GNUTLS_E_SUCCESS){
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
478
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
479
576
}
480
577
481
578
{
482
579
const char *err;
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
do {
581
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
if(quit_now){
583
gnutls_deinit(*session);
584
return -1;
585
}
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
484
587
if(ret != GNUTLS_E_SUCCESS){
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
488
591
gnutls_deinit(*session);
489
592
return -1;
490
593
}
491
594
}
492
595
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
596
do {
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc.cred);
599
if(quit_now){
600
gnutls_deinit(*session);
601
return -1;
602
}
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
604
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
497
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
498
607
gnutls_deinit(*session);
499
608
return -1;
500
609
}
501
610
502
611
/* ignore client certificate if any. */
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
613
506
614
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
507
615
513
621
__attribute__((unused)) const char *txt){}
514
622
515
623
/* Called when a Mandos server is found */
516
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
517
625
AvahiIfIndex if_index,
518
626
int af){
519
int ret, tcp_sd;
627
int ret, tcp_sd = -1;
520
628
ssize_t sret;
521
629
union {
522
630
struct sockaddr_in in;
523
631
struct sockaddr_in6 in6;
524
632
} to;
525
633
char *buffer = NULL;
526
char *decrypted_buffer;
634
char *decrypted_buffer = NULL;
527
635
size_t buffer_length = 0;
528
636
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
530
637
size_t written;
531
int retval = 0;
638
int retval = -1;
532
639
gnutls_session_t session;
533
640
int pf; /* Protocol family */
534
641
642
errno = 0;
643
644
if(quit_now){
645
errno = EINTR;
646
return -1;
647
}
648
535
649
switch(af){
536
650
case AF_INET6:
537
651
pf = PF_INET6;
540
654
pf = PF_INET;
541
655
break;
542
656
default:
543
fprintf(stderr, "Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
658
errno = EINVAL;
544
659
return -1;
545
660
}
546
661
550
665
}
551
666
552
667
if(debug){
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
554
"\n", ip, port);
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
669
PRIuMAX "\n", ip, (uintmax_t)port);
555
670
}
556
671
557
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
558
673
if(tcp_sd < 0){
559
perror("socket");
560
return -1;
674
int e = errno;
675
perror_plus("socket");
676
errno = e;
677
goto mandos_end;
678
}
679
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
561
683
}
562
684
563
685
memset(&to, 0, sizeof(to));
564
686
if(af == AF_INET6){
565
to.in6.sin6_family = (uint16_t)af;
687
to.in6.sin6_family = (sa_family_t)af;
566
688
ret = inet_pton(af, ip, &to.in6.sin6_addr);
567
689
} else { /* IPv4 */
568
690
to.in.sin_family = (sa_family_t)af;
569
691
ret = inet_pton(af, ip, &to.in.sin_addr);
570
692
}
571
693
if(ret < 0 ){
572
perror("inet_pton");
573
return -1;
694
int e = errno;
695
perror_plus("inet_pton");
696
errno = e;
697
goto mandos_end;
574
698
}
575
699
if(ret == 0){
576
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
700
int e = errno;
701
fprintf_plus(stderr, "Bad address: %s\n", ip);
702
errno = e;
703
goto mandos_end;
578
704
}
579
705
if(af == AF_INET6){
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
581
-Wconversion and
582
-Wunreachable-code */
583
706
to.in6.sin6_port = htons(port);
584
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
585
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
586
-Wunreachable-code*/
709
-Wunreachable-code*/
587
710
if(if_index == AVAHI_IF_UNSPEC){
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
" without a network interface\n");
590
return -1;
711
fprintf_plus(stderr, "An IPv6 link-local address is"
712
" incomplete without a network interface\n");
713
errno = EINVAL;
714
goto mandos_end;
591
715
}
592
716
/* Set the network interface number as scope */
593
717
to.in6.sin6_scope_id = (uint32_t)if_index;
598
722
-Wunreachable-code */
599
723
}
600
724
725
if(quit_now){
726
errno = EINTR;
727
goto mandos_end;
728
}
729
601
730
if(debug){
602
731
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
732
char interface[IF_NAMESIZE];
604
733
if(if_indextoname((unsigned int)if_index, interface) == NULL){
605
perror("if_indextoname");
734
perror_plus("if_indextoname");
606
735
} else {
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
608
ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
609
738
}
610
739
} else {
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
613
742
}
614
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
615
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
622
751
sizeof(addrstr));
623
752
}
624
753
if(pcret == NULL){
625
perror("inet_ntop");
754
perror_plus("inet_ntop");
626
755
} else {
627
756
if(strcmp(addrstr, ip) != 0){
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
629
758
}
630
759
}
631
760
}
632
761
762
if(quit_now){
763
errno = EINTR;
764
goto mandos_end;
765
}
766
633
767
if(af == AF_INET6){
634
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
635
769
} else {
636
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
637
771
}
638
772
if(ret < 0){
639
perror("connect");
640
return -1;
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
778
goto mandos_end;
779
}
780
781
if(quit_now){
782
errno = EINTR;
783
goto mandos_end;
641
784
}
642
785
643
786
const char *out = mandos_protocol_version;
645
788
while(true){
646
789
size_t out_size = strlen(out);
647
790
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
out_size - written));
791
out_size - written));
649
792
if(ret == -1){
650
perror("write");
651
retval = -1;
793
int e = errno;
794
perror_plus("write");
795
errno = e;
652
796
goto mandos_end;
653
797
}
654
798
written += (size_t)ret;
662
806
break;
663
807
}
664
808
}
809
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
665
814
}
666
815
667
816
if(debug){
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
}
670
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
673
do{
817
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
818
}
819
820
if(quit_now){
821
errno = EINTR;
822
goto mandos_end;
823
}
824
825
/* This casting via intptr_t is to eliminate warning about casting
826
an int to a pointer type. This is exactly how the GnuTLS Guile
827
function "set-session-transport-fd!" does it. */
828
gnutls_transport_set_ptr(session,
829
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
830
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
834
}
835
836
do {
674
837
ret = gnutls_handshake(session);
838
if(quit_now){
839
errno = EINTR;
840
goto mandos_end;
841
}
675
842
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
676
843
677
844
if(ret != GNUTLS_E_SUCCESS){
678
845
if(debug){
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
846
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
680
847
gnutls_perror(ret);
681
848
}
682
retval = -1;
849
errno = EPROTO;
683
850
goto mandos_end;
684
851
}
685
852
686
853
/* Read OpenPGP packet that contains the wanted password */
687
854
688
855
if(debug){
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
690
ip);
856
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
857
" %s\n", ip);
691
858
}
692
859
693
860
while(true){
861
862
if(quit_now){
863
errno = EINTR;
864
goto mandos_end;
865
}
866
694
867
buffer_capacity = incbuffer(&buffer, buffer_length,
695
buffer_capacity);
868
buffer_capacity);
696
869
if(buffer_capacity == 0){
697
perror("incbuffer");
698
retval = -1;
870
int e = errno;
871
perror_plus("incbuffer");
872
errno = e;
873
goto mandos_end;
874
}
875
876
if(quit_now){
877
errno = EINTR;
699
878
goto mandos_end;
700
879
}
701
880
710
889
case GNUTLS_E_AGAIN:
711
890
break;
712
891
case GNUTLS_E_REHANDSHAKE:
713
do{
892
do {
714
893
ret = gnutls_handshake(session);
894
895
if(quit_now){
896
errno = EINTR;
897
goto mandos_end;
898
}
715
899
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
716
900
if(ret < 0){
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
902
"***\n");
718
903
gnutls_perror(ret);
719
retval = -1;
904
errno = EPROTO;
720
905
goto mandos_end;
721
906
}
722
907
break;
723
908
default:
724
fprintf(stderr, "Unknown error while reading data from"
725
" encrypted session with Mandos server\n");
726
retval = -1;
909
fprintf_plus(stderr, "Unknown error while reading data from"
910
" encrypted session with Mandos server\n");
727
911
gnutls_bye(session, GNUTLS_SHUT_RDWR);
912
errno = EIO;
728
913
goto mandos_end;
729
914
}
730
915
} else {
733
918
}
734
919
735
920
if(debug){
736
fprintf(stderr, "Closing TLS session\n");
737
}
738
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
921
fprintf_plus(stderr, "Closing TLS session\n");
922
}
923
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
929
do {
930
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
931
if(quit_now){
932
errno = EINTR;
933
goto mandos_end;
934
}
935
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
936
741
937
if(buffer_length > 0){
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
buffer_length,
938
ssize_t decrypted_buffer_size;
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
744
940
&decrypted_buffer);
745
941
if(decrypted_buffer_size >= 0){
942
746
943
written = 0;
747
944
while(written < (size_t) decrypted_buffer_size){
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
949
748
950
ret = (int)fwrite(decrypted_buffer + written, 1,
749
951
(size_t)decrypted_buffer_size - written,
750
952
stdout);
751
953
if(ret == 0 and ferror(stdout)){
954
int e = errno;
752
955
if(debug){
753
fprintf(stderr, "Error writing encrypted data: %s\n",
754
strerror(errno));
956
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
957
strerror(errno));
755
958
}
756
retval = -1;
757
break;
959
errno = e;
960
goto mandos_end;
758
961
}
759
962
written += (size_t)ret;
760
963
}
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
964
retval = 0;
764
965
}
765
} else {
766
retval = -1;
767
966
}
768
967
769
968
/* Shutdown procedure */
770
969
771
970
mandos_end:
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
971
{
972
int e = errno;
973
free(decrypted_buffer);
974
free(buffer);
975
if(tcp_sd >= 0){
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
977
}
978
if(ret == -1){
979
if(e == 0){
980
e = errno;
981
}
982
perror_plus("close");
983
}
984
gnutls_deinit(session);
985
errno = e;
986
if(quit_now){
987
errno = EINTR;
988
retval = -1;
989
}
776
990
}
777
gnutls_deinit(session);
778
991
return retval;
779
992
}
780
993
792
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
793
1006
flags,
794
1007
AVAHI_GCC_UNUSED void* userdata){
795
assert(r);
1008
if(r == NULL){
1009
return;
1010
}
796
1011
797
1012
/* Called whenever a service has been resolved successfully or
798
1013
timed out */
799
1014
1015
if(quit_now){
1016
return;
1017
}
1018
800
1019
switch(event){
801
1020
default:
802
1021
case AVAHI_RESOLVER_FAILURE:
803
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
804
" of type '%s' in domain '%s': %s\n", name, type, domain,
805
avahi_strerror(avahi_server_errno(mc.server)));
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1024
domain,
1025
avahi_strerror(avahi_server_errno(mc.server)));
806
1026
break;
807
1027
808
1028
case AVAHI_RESOLVER_FOUND:
810
1030
char ip[AVAHI_ADDRESS_STR_MAX];
811
1031
avahi_address_snprint(ip, sizeof(ip), address);
812
1032
if(debug){
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
814
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
ip, (intmax_t)interface, port);
1033
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1034
PRIdMAX ") on port %" PRIu16 "\n", name,
1035
host_name, ip, (intmax_t)interface, port);
816
1036
}
817
int ret = start_mandos_communication(ip, port, interface,
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
interface,
818
1039
avahi_proto_to_af(proto));
819
1040
if(ret == 0){
820
1041
avahi_simple_poll_quit(mc.simple_poll);
1042
} else {
1043
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto))){
1045
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1046
" list\n", name);
1047
}
821
1048
}
822
1049
}
823
1050
}
834
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
835
1062
flags,
836
1063
AVAHI_GCC_UNUSED void* userdata){
837
assert(b);
1064
if(b == NULL){
1065
return;
1066
}
838
1067
839
1068
/* Called whenever a new services becomes available on the LAN or
840
1069
is removed from the LAN */
841
1070
1071
if(quit_now){
1072
return;
1073
}
1074
842
1075
switch(event){
843
1076
default:
844
1077
case AVAHI_BROWSER_FAILURE:
845
1078
846
fprintf(stderr, "(Avahi browser) %s\n",
847
avahi_strerror(avahi_server_errno(mc.server)));
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
848
1081
avahi_simple_poll_quit(mc.simple_poll);
849
1082
return;
850
1083
857
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
858
1091
name, type, domain, protocol, 0,
859
1092
resolve_callback, NULL) == NULL)
860
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
861
name, avahi_strerror(avahi_server_errno(mc.server)));
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
862
1096
break;
863
1097
864
1098
case AVAHI_BROWSER_REMOVE:
867
1101
case AVAHI_BROWSER_ALL_FOR_NOW:
868
1102
case AVAHI_BROWSER_CACHE_EXHAUSTED:
869
1103
if(debug){
870
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
871
1106
}
872
1107
break;
873
1108
}
874
1109
}
875
1110
876
sig_atomic_t quit_now = 0;
877
878
/* stop main loop after sigterm has been called */
879
static void handle_sigterm(__attribute__((unused)) int sig){
1111
/* Signal handler that stops main loop after SIGTERM */
1112
static void handle_sigterm(int sig){
880
1113
if(quit_now){
881
1114
return;
882
1115
}
883
1116
quit_now = 1;
1117
signal_received = sig;
884
1118
int old_errno = errno;
1119
/* set main loop to exit */
885
1120
if(mc.simple_poll != NULL){
886
1121
avahi_simple_poll_quit(mc.simple_poll);
887
1122
}
888
1123
errno = old_errno;
889
1124
}
890
1125
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
int ret;
1128
error_t ret_errno;
1129
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
if(s < 0){
1132
ret_errno = errno;
1133
perror_plus("socket");
1134
errno = ret_errno;
1135
return false;
1136
}
1137
strcpy(ifr->ifr_name, ifname);
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
if(ret == -1){
1140
if(debug){
1141
ret_errno = errno;
1142
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1144
}
1145
return false;
1146
}
1147
return true;
1148
}
1149
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1152
/* Reject the loopback device */
1153
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1156
ifname);
1157
}
1158
return false;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf_plus(stderr, "Accepting point-to-point interface"
1164
" \"%s\"\n", ifname);
1165
}
1166
return true;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1172
" \"%s\"\n", ifname);
1173
}
1174
return false;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(ifr->ifr_flags & IFF_NOARP){
1178
if(debug){
1179
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
ifname);
1181
}
1182
return false;
1183
}
1184
1185
/* Accept this device */
1186
if(debug){
1187
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1188
}
1189
return true;
1190
}
1191
1192
/*
1193
* This function determines if a directory entry in /sys/class/net
1194
* corresponds to an acceptable network device.
1195
* (This function is passed to scandir(3) as a filter function.)
1196
*/
1197
int good_interface(const struct dirent *if_entry){
1198
if(if_entry->d_name[0] == '.'){
1199
return 0;
1200
}
1201
1202
struct ifreq ifr;
1203
if(not get_flags(if_entry->d_name, &ifr)){
1204
if(debug){
1205
fprintf_plus(stderr, "Failed to get flags for interface "
1206
"\"%s\"\n", if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
/*
1218
* This function determines if a network interface is up.
1219
*/
1220
bool interface_is_up(const char *interface){
1221
struct ifreq ifr;
1222
if(not get_flags(interface, &ifr)){
1223
if(debug){
1224
fprintf_plus(stderr, "Failed to get flags for interface "
1225
"\"%s\"\n", interface);
1226
}
1227
return false;
1228
}
1229
1230
return (bool)(ifr.ifr_flags & IFF_UP);
1231
}
1232
1233
/*
1234
* This function determines if a network interface is running
1235
*/
1236
bool interface_is_running(const char *interface){
1237
struct ifreq ifr;
1238
if(not get_flags(interface, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", interface);
1242
}
1243
return false;
1244
}
1245
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
}
1248
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1255
return 0;
1256
}
1257
return 1;
1258
}
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
int ret;
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1326
1327
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1332
}
1333
ret = avahi_simple_poll_iterate(s, -1);
1334
} else {
1335
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1338
}
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1341
if(ret == -1){
1342
perror_plus("clock_gettime");
1343
return -1;
1344
}
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1358
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1361
}
1362
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1368
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1370
return 0;
1371
}
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1374
if(ret == -1){
1375
perror_plus("clock_gettime");
1376
return -1;
1377
}
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1381
}
1382
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
}
1385
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1388
}
1389
}
1390
}
1391
}
1392
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1446
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
1453
perror_plus("scandir");
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1461
perror_plus("asprintf");
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
free(delaystring);
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
1532
} else {
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
1569
}
1570
1571
error_t bring_up_interface(const char *const interface,
1572
const float delay){
1573
int sd = -1;
1574
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
1577
struct ifreq network;
1578
unsigned int if_index = if_nametoindex(interface);
1579
if(if_index == 0){
1580
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1581
errno = old_errno;
1582
return ENXIO;
1583
}
1584
1585
if(quit_now){
1586
errno = old_errno;
1587
return EINTR;
1588
}
1589
1590
if(not interface_is_up(interface)){
1591
if(not get_flags(interface, &network) and debug){
1592
ret_errno = errno;
1593
fprintf_plus(stderr, "Failed to get flags for interface "
1594
"\"%s\"\n", interface);
1595
return ret_errno;
1596
}
1597
network.ifr_flags |= IFF_UP;
1598
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
1601
ret_errno = errno;
1602
perror_plus("socket");
1603
errno = old_errno;
1604
return ret_errno;
1605
}
1606
1607
if(quit_now){
1608
close(sd);
1609
errno = old_errno;
1610
return EINTR;
1611
}
1612
1613
if(debug){
1614
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1615
interface);
1616
}
1617
1618
/* Raise priviliges */
1619
raise_privileges();
1620
1621
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
1629
}
1630
#endif /* __linux__ */
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
1633
#ifdef __linux__
1634
if(restore_loglevel){
1635
ret_linux = klogctl(7, NULL, 0);
1636
if(ret_linux == -1){
1637
perror_plus("klogctl");
1638
}
1639
}
1640
#endif /* __linux__ */
1641
1642
/* Lower privileges */
1643
lower_privileges();
1644
1645
/* Close the socket */
1646
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1647
if(ret == -1){
1648
perror_plus("close");
1649
}
1650
1651
if(ret_setflags == -1){
1652
errno = ret_errno;
1653
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1654
errno = old_errno;
1655
return ret_errno;
1656
}
1657
} else if(debug){
1658
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1659
interface);
1660
}
1661
1662
/* Sleep checking until interface is running.
1663
Check every 0.25s, up to total time of delay */
1664
for(int i=0; i < delay * 4; i++){
1665
if(interface_is_running(interface)){
1666
break;
1667
}
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1672
}
1673
}
1674
1675
errno = old_errno;
1676
return 0;
1677
}
1678
1679
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
if(interface_is_up(interface)){
1692
if(not get_flags(interface, &network) and debug){
1693
ret_errno = errno;
1694
fprintf_plus(stderr, "Failed to get flags for interface "
1695
"\"%s\"\n", interface);
1696
return ret_errno;
1697
}
1698
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1699
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
1702
ret_errno = errno;
1703
perror_plus("socket");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
1708
if(debug){
1709
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1710
interface);
1711
}
1712
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
1721
1722
/* Close the socket */
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1724
if(ret == -1){
1725
perror_plus("close");
1726
}
1727
1728
if(ret_setflags == -1){
1729
errno = ret_errno;
1730
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
} else if(debug){
1735
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1736
interface);
1737
}
1738
1739
errno = old_errno;
1740
return 0;
1741
}
1742
891
1743
int main(int argc, char *argv[]){
892
1744
AvahiSServiceBrowser *sb = NULL;
893
int error;
1745
error_t ret_errno;
894
1746
int ret;
895
1747
intmax_t tmpmax;
896
1748
char *tmp;
897
1749
int exitcode = EXIT_SUCCESS;
898
const char *interface = "eth0";
899
struct ifreq network;
900
int sd;
901
uid_t uid;
902
gid_t gid;
903
char *connect_to = NULL;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1752
char *interfaces_to_take_down = NULL;
1753
size_t interfaces_to_take_down_size = 0;
904
1754
char tempdir[] = "/tmp/mandosXXXXXX";
905
1755
bool tempdir_created = false;
906
1756
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
907
1757
const char *seckey = PATHDIR "/" SECKEY;
908
1758
const char *pubkey = PATHDIR "/" PUBKEY;
1759
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
909
1761
910
1762
bool gnutls_initialized = false;
911
1763
bool gpgme_initialized = false;
912
1764
float delay = 2.5f;
1765
double retry_interval = 10; /* 10s between trying a server and
1766
retrying the same server again */
913
1767
914
struct sigaction old_sigterm_action;
1768
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
915
1769
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
916
1770
1771
uid = getuid();
1772
gid = getgid();
1773
1774
/* Lower any group privileges we might have, just to be safe */
1775
errno = 0;
1776
ret = setgid(gid);
1777
if(ret == -1){
1778
perror_plus("setgid");
1779
}
1780
1781
/* Lower user privileges (temporarily) */
1782
errno = 0;
1783
ret = seteuid(uid);
1784
if(ret == -1){
1785
perror_plus("seteuid");
1786
}
1787
1788
if(quit_now){
1789
goto end;
1790
}
1791
917
1792
{
918
1793
struct argp_option options[] = {
919
1794
{ .name = "debug", .key = 128,
948
1823
.arg = "SECONDS",
949
1824
.doc = "Maximum delay to wait for interface startup",
950
1825
.group = 2 },
1826
{ .name = "retry", .key = 132,
1827
.arg = "SECONDS",
1828
.doc = "Retry interval used when denied by the Mandos server",
1829
.group = 2 },
1830
{ .name = "network-hook-dir", .key = 133,
1831
.arg = "DIR",
1832
.doc = "Directory where network hooks are located",
1833
.group = 2 },
1834
/*
1835
* These reproduce what we would get without ARGP_NO_HELP
1836
*/
1837
{ .name = "help", .key = '?',
1838
.doc = "Give this help list", .group = -1 },
1839
{ .name = "usage", .key = -3,
1840
.doc = "Give a short usage message", .group = -1 },
1841
{ .name = "version", .key = 'V',
1842
.doc = "Print program version", .group = -1 },
951
1843
{ .name = NULL }
952
1844
};
953
1845
954
1846
error_t parse_opt(int key, char *arg,
955
1847
struct argp_state *state){
1848
errno = 0;
956
1849
switch(key){
957
1850
case 128: /* --debug */
958
1851
debug = true;
961
1854
connect_to = arg;
962
1855
break;
963
1856
case 'i': /* --interface */
964
interface = arg;
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
1859
if(ret_errno != 0){
1860
argp_error(state, "%s", strerror(ret_errno));
1861
}
965
1862
break;
966
1863
case 's': /* --seckey */
967
1864
seckey = arg;
974
1871
tmpmax = strtoimax(arg, &tmp, 10);
975
1872
if(errno != 0 or tmp == arg or *tmp != '\0'
976
1873
or tmpmax != (typeof(mc.dh_bits))tmpmax){
977
fprintf(stderr, "Bad number of DH bits\n");
978
exit(EXIT_FAILURE);
1874
argp_error(state, "Bad number of DH bits");
979
1875
}
980
1876
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
981
1877
break;
986
1882
errno = 0;
987
1883
delay = strtof(arg, &tmp);
988
1884
if(errno != 0 or tmp == arg or *tmp != '\0'){
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
991
}
992
break;
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
1885
argp_error(state, "Bad delay");
1886
}
1887
case 132: /* --retry */
1888
errno = 0;
1889
retry_interval = strtod(arg, &tmp);
1890
if(errno != 0 or tmp == arg or *tmp != '\0'
1891
or (retry_interval * 1000) > INT_MAX
1892
or retry_interval < 0){
1893
argp_error(state, "Bad retry interval");
1894
}
1895
break;
1896
case 133: /* --network-hook-dir */
1897
hookdir = arg;
1898
break;
1899
/*
1900
* These reproduce what we would get without ARGP_NO_HELP
1901
*/
1902
case '?': /* --help */
1903
argp_state_help(state, state->out_stream,
1904
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1905
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1906
case -3: /* --usage */
1907
argp_state_help(state, state->out_stream,
1908
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1909
case 'V': /* --version */
1910
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1911
exit(argp_err_exit_status);
996
1912
break;
997
1913
default:
998
1914
return ARGP_ERR_UNKNOWN;
999
1915
}
1000
return 0;
1916
return errno;
1001
1917
}
1002
1918
1003
1919
struct argp argp = { .options = options, .parser = parse_opt,
1004
1920
.args_doc = "",
1005
1921
.doc = "Mandos client -- Get and decrypt"
1006
1922
" passwords from a Mandos server" };
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1923
ret = argp_parse(&argp, argc, argv,
1924
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1925
switch(ret){
1926
case 0:
1927
break;
1928
case ENOMEM:
1929
default:
1930
errno = ret;
1931
perror_plus("argp_parse");
1932
exitcode = EX_OSERR;
1933
goto end;
1934
case EINVAL:
1935
exitcode = EX_USAGE;
1936
goto end;
1937
}
1938
}
1939
1940
{
1941
/* Work around Debian bug #633582:
1942
<http://bugs.debian.org/633582> */
1943
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
1946
struct stat st;
1947
1948
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1949
int seckey_fd = open(seckey, O_RDONLY);
1950
if(seckey_fd == -1){
1951
perror_plus("open");
1952
} else {
1953
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1954
if(ret == -1){
1955
perror_plus("fstat");
1956
} else {
1957
if(S_ISREG(st.st_mode)
1958
and st.st_uid == 0 and st.st_gid == 0){
1959
ret = fchown(seckey_fd, uid, gid);
1960
if(ret == -1){
1961
perror_plus("fchown");
1962
}
1963
}
1964
}
1965
TEMP_FAILURE_RETRY(close(seckey_fd));
1966
}
1967
}
1968
1969
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1970
int pubkey_fd = open(pubkey, O_RDONLY);
1971
if(pubkey_fd == -1){
1972
perror_plus("open");
1973
} else {
1974
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1975
if(ret == -1){
1976
perror_plus("fstat");
1977
} else {
1978
if(S_ISREG(st.st_mode)
1979
and st.st_uid == 0 and st.st_gid == 0){
1980
ret = fchown(pubkey_fd, uid, gid);
1981
if(ret == -1){
1982
perror_plus("fchown");
1983
}
1984
}
1985
}
1986
TEMP_FAILURE_RETRY(close(pubkey_fd));
1987
}
1988
}
1989
1990
/* Lower privileges */
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
1995
}
1996
}
1997
}
1998
1999
/* Remove empty interface names */
2000
{
2001
char *interface = NULL;
2002
while((interface = argz_next(interfaces, interfaces_size,
2003
interface))){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2006
fprintf_plus(stderr, "Not using nonexisting interface"
2007
" \"%s\"\n", interface);
2008
}
2009
argz_delete(&interfaces, &interfaces_size, interface);
2010
interface = NULL;
2011
}
2012
}
2013
}
2014
2015
/* Run network hooks */
2016
{
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
1011
2026
goto end;
1012
2027
}
1013
2028
}
1022
2037
srand((unsigned int) time(NULL));
1023
2038
mc.simple_poll = avahi_simple_poll_new();
1024
2039
if(mc.simple_poll == NULL){
1025
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1026
exitcode = EXIT_FAILURE;
2040
fprintf_plus(stderr,
2041
"Avahi: Failed to create simple poll object.\n");
2042
exitcode = EX_UNAVAILABLE;
1027
2043
goto end;
1028
2044
}
1029
2045
1030
2046
sigemptyset(&sigterm_action.sa_mask);
1031
2047
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1032
2048
if(ret == -1){
1033
perror("sigaddset");
1034
exitcode = EXIT_FAILURE;
2049
perror_plus("sigaddset");
2050
exitcode = EX_OSERR;
1035
2051
goto end;
1036
2052
}
1037
2053
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1038
2054
if(ret == -1){
1039
perror("sigaddset");
1040
exitcode = EXIT_FAILURE;
2055
perror_plus("sigaddset");
2056
exitcode = EX_OSERR;
1041
2057
goto end;
1042
2058
}
1043
2059
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1044
2060
if(ret == -1){
1045
perror("sigaddset");
1046
exitcode = EXIT_FAILURE;
1047
goto end;
1048
}
1049
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1050
if(ret == -1){
1051
perror("sigaction");
1052
exitcode = EXIT_FAILURE;
1053
goto end;
1054
}
1055
1056
/* If the interface is down, bring it up */
1057
if(interface[0] != '\0'){
1058
#ifdef __linux__
1059
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1060
messages to mess up the prompt */
1061
ret = klogctl(8, NULL, 5);
1062
bool restore_loglevel = true;
1063
if(ret == -1){
1064
restore_loglevel = false;
1065
perror("klogctl");
1066
}
1067
#endif /* __linux__ */
1068
1069
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1070
if(sd < 0){
1071
perror("socket");
1072
exitcode = EXIT_FAILURE;
1073
#ifdef __linux__
1074
if(restore_loglevel){
1075
ret = klogctl(7, NULL, 0);
1076
if(ret == -1){
1077
perror("klogctl");
1078
}
1079
}
1080
#endif /* __linux__ */
1081
goto end;
1082
}
1083
strcpy(network.ifr_name, interface);
1084
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1085
if(ret == -1){
1086
perror("ioctl SIOCGIFFLAGS");
1087
#ifdef __linux__
1088
if(restore_loglevel){
1089
ret = klogctl(7, NULL, 0);
1090
if(ret == -1){
1091
perror("klogctl");
1092
}
1093
}
1094
#endif /* __linux__ */
1095
exitcode = EXIT_FAILURE;
1096
goto end;
1097
}
1098
if((network.ifr_flags & IFF_UP) == 0){
1099
network.ifr_flags |= IFF_UP;
1100
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1101
if(ret == -1){
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1104
#ifdef __linux__
1105
if(restore_loglevel){
1106
ret = klogctl(7, NULL, 0);
1107
if(ret == -1){
1108
perror("klogctl");
1109
}
1110
}
1111
#endif /* __linux__ */
1112
goto end;
1113
}
1114
}
1115
/* sleep checking until interface is running */
1116
for(int i=0; i < delay * 4; i++){
1117
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1118
if(ret == -1){
1119
perror("ioctl SIOCGIFFLAGS");
1120
} else if(network.ifr_flags & IFF_RUNNING){
1121
break;
1122
}
1123
struct timespec sleeptime = { .tv_nsec = 250000000 };
1124
ret = nanosleep(&sleeptime, NULL);
1125
if(ret == -1 and errno != EINTR){
1126
perror("nanosleep");
1127
}
1128
}
1129
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1130
if(ret == -1){
1131
perror("close");
1132
}
1133
#ifdef __linux__
1134
if(restore_loglevel){
1135
/* Restores kernel loglevel to default */
1136
ret = klogctl(7, NULL, 0);
1137
if(ret == -1){
1138
perror("klogctl");
1139
}
1140
}
1141
#endif /* __linux__ */
1142
}
1143
1144
uid = getuid();
1145
gid = getgid();
1146
1147
errno = 0;
1148
setgid(gid);
1149
if(ret == -1){
1150
perror("setgid");
1151
}
1152
1153
ret = setuid(uid);
1154
if(ret == -1){
1155
perror("setuid");
2061
perror_plus("sigaddset");
2062
exitcode = EX_OSERR;
2063
goto end;
2064
}
2065
/* Need to check if the handler is SIG_IGN before handling:
2066
| [[info:libc:Initial Signal Actions]] |
2067
| [[info:libc:Basic Signal Handling]] |
2068
*/
2069
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2070
if(ret == -1){
2071
perror_plus("sigaction");
2072
return EX_OSERR;
2073
}
2074
if(old_sigterm_action.sa_handler != SIG_IGN){
2075
ret = sigaction(SIGINT, &sigterm_action, NULL);
2076
if(ret == -1){
2077
perror_plus("sigaction");
2078
exitcode = EX_OSERR;
2079
goto end;
2080
}
2081
}
2082
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2083
if(ret == -1){
2084
perror_plus("sigaction");
2085
return EX_OSERR;
2086
}
2087
if(old_sigterm_action.sa_handler != SIG_IGN){
2088
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2089
if(ret == -1){
2090
perror_plus("sigaction");
2091
exitcode = EX_OSERR;
2092
goto end;
2093
}
2094
}
2095
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2096
if(ret == -1){
2097
perror_plus("sigaction");
2098
return EX_OSERR;
2099
}
2100
if(old_sigterm_action.sa_handler != SIG_IGN){
2101
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2102
if(ret == -1){
2103
perror_plus("sigaction");
2104
exitcode = EX_OSERR;
2105
goto end;
2106
}
2107
}
2108
2109
/* If no interfaces were specified, make a list */
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2112
/* Look for any good interfaces */
2113
ret = scandir(sys_class_net, &direntries, good_interface,
2114
alphasort);
2115
if(ret >= 1){
2116
/* Add all found interfaces to interfaces list */
2117
for(int i = 0; i < ret; ++i){
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2119
direntries[i]->d_name);
2120
if(ret_errno != 0){
2121
perror_plus("argz_add");
2122
continue;
2123
}
2124
if(debug){
2125
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2126
direntries[i]->d_name);
2127
}
2128
}
2129
free(direntries);
2130
} else {
2131
free(direntries);
2132
fprintf_plus(stderr, "Could not find a network interface\n");
2133
exitcode = EXIT_FAILURE;
2134
goto end;
2135
}
2136
}
2137
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2150
char *interface = NULL;
2151
while((interface = argz_next(interfaces, interfaces_size,
2152
interface))){
2153
bool interface_was_up = interface_is_up(interface);
2154
ret = bring_up_interface(interface, delay);
2155
if(not interface_was_up){
2156
if(ret != 0){
2157
errno = ret;
2158
perror_plus("Failed to bring up interface");
2159
} else {
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2163
}
2164
}
2165
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2169
if(debug and (interfaces_to_take_down == NULL)){
2170
fprintf_plus(stderr, "No interfaces were brought up\n");
2171
}
2172
}
2173
2174
if(quit_now){
2175
goto end;
1156
2176
}
1157
2177
1158
2178
ret = init_gnutls_global(pubkey, seckey);
1159
2179
if(ret == -1){
1160
fprintf(stderr, "init_gnutls_global failed\n");
1161
exitcode = EXIT_FAILURE;
2180
fprintf_plus(stderr, "init_gnutls_global failed\n");
2181
exitcode = EX_UNAVAILABLE;
1162
2182
goto end;
1163
2183
} else {
1164
2184
gnutls_initialized = true;
1165
2185
}
1166
2186
2187
if(quit_now){
2188
goto end;
2189
}
2190
1167
2191
if(mkdtemp(tempdir) == NULL){
1168
perror("mkdtemp");
2192
perror_plus("mkdtemp");
1169
2193
goto end;
1170
2194
}
1171
2195
tempdir_created = true;
1172
2196
2197
if(quit_now){
2198
goto end;
2199
}
2200
1173
2201
if(not init_gpgme(pubkey, seckey, tempdir)){
1174
fprintf(stderr, "init_gpgme failed\n");
1175
exitcode = EXIT_FAILURE;
2202
fprintf_plus(stderr, "init_gpgme failed\n");
2203
exitcode = EX_UNAVAILABLE;
1176
2204
goto end;
1177
2205
} else {
1178
2206
gpgme_initialized = true;
1179
2207
}
1180
2208
1181
if(interface[0] != '\0'){
1182
if_index = (AvahiIfIndex) if_nametoindex(interface);
1183
if(if_index == 0){
1184
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
2209
if(quit_now){
2210
goto end;
1188
2211
}
1189
2212
1190
2213
if(connect_to != NULL){
1191
2214
/* Connect directly, do not use Zeroconf */
1192
2215
/* (Mainly meant for debugging) */
1193
2216
char *address = strrchr(connect_to, ':');
2217
1194
2218
if(address == NULL){
1195
fprintf(stderr, "No colon in address\n");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
uint16_t port;
2219
fprintf_plus(stderr, "No colon in address\n");
2220
exitcode = EX_USAGE;
2221
goto end;
2222
}
2223
2224
if(quit_now){
2225
goto end;
2226
}
2227
2228
in_port_t port;
1200
2229
errno = 0;
1201
2230
tmpmax = strtoimax(address+1, &tmp, 10);
1202
2231
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1203
or tmpmax != (uint16_t)tmpmax){
1204
fprintf(stderr, "Bad port number\n");
1205
exitcode = EXIT_FAILURE;
1206
goto end;
1207
}
1208
port = (uint16_t)tmpmax;
2232
or tmpmax != (in_port_t)tmpmax){
2233
fprintf_plus(stderr, "Bad port number\n");
2234
exitcode = EX_USAGE;
2235
goto end;
2236
}
2237
2238
if(quit_now){
2239
goto end;
2240
}
2241
2242
port = (in_port_t)tmpmax;
1209
2243
*address = '\0';
1210
address = connect_to;
1211
2244
/* Colon in address indicates IPv6 */
1212
2245
int af;
1213
if(strchr(address, ':') != NULL){
2246
if(strchr(connect_to, ':') != NULL){
1214
2247
af = AF_INET6;
2248
/* Accept [] around IPv6 address - see RFC 5952 */
2249
if(connect_to[0] == '[' and address[-1] == ']')
2250
{
2251
connect_to++;
2252
address[-1] = '\0';
2253
}
1215
2254
} else {
1216
2255
af = AF_INET;
1217
2256
}
1218
ret = start_mandos_communication(address, port, if_index, af);
1219
if(ret < 0){
1220
exitcode = EXIT_FAILURE;
1221
} else {
2257
address = connect_to;
2258
2259
if(quit_now){
2260
goto end;
2261
}
2262
2263
while(not quit_now){
2264
ret = start_mandos_communication(address, port, if_index, af);
2265
if(quit_now or ret == 0){
2266
break;
2267
}
2268
if(debug){
2269
fprintf_plus(stderr, "Retrying in %d seconds\n",
2270
(int)retry_interval);
2271
}
2272
sleep((int)retry_interval);
2273
}
2274
2275
if (not quit_now){
1222
2276
exitcode = EXIT_SUCCESS;
1223
2277
}
1224
goto end;
1225
}
1226
2278
2279
goto end;
2280
}
2281
2282
if(quit_now){
2283
goto end;
2284
}
2285
1227
2286
{
1228
2287
AvahiServerConfig config;
1229
2288
/* Do not publish any local Zeroconf records */
1236
2295
/* Allocate a new server */
1237
2296
mc.server = avahi_server_new(avahi_simple_poll_get
1238
2297
(mc.simple_poll), &config, NULL,
1239
NULL, &error);
2298
NULL, &ret_errno);
1240
2299
1241
2300
/* Free the Avahi configuration data */
1242
2301
avahi_server_config_free(&config);
1244
2303
1245
2304
/* Check if creating the Avahi server object succeeded */
1246
2305
if(mc.server == NULL){
1247
fprintf(stderr, "Failed to create Avahi server: %s\n",
1248
avahi_strerror(error));
1249
exitcode = EXIT_FAILURE;
2306
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2307
avahi_strerror(ret_errno));
2308
exitcode = EX_UNAVAILABLE;
2309
goto end;
2310
}
2311
2312
if(quit_now){
1250
2313
goto end;
1251
2314
}
1252
2315
1255
2318
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1256
2319
NULL, 0, browse_callback, NULL);
1257
2320
if(sb == NULL){
1258
fprintf(stderr, "Failed to create service browser: %s\n",
1259
avahi_strerror(avahi_server_errno(mc.server)));
1260
exitcode = EXIT_FAILURE;
2321
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
avahi_strerror(avahi_server_errno(mc.server)));
2323
exitcode = EX_UNAVAILABLE;
2324
goto end;
2325
}
2326
2327
if(quit_now){
1261
2328
goto end;
1262
2329
}
1263
2330
1264
2331
/* Run the main loop */
1265
2332
1266
2333
if(debug){
1267
fprintf(stderr, "Starting Avahi loop search\n");
1268
}
1269
1270
avahi_simple_poll_loop(mc.simple_poll);
2334
fprintf_plus(stderr, "Starting Avahi loop search\n");
2335
}
2336
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2339
if(debug){
2340
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2341
(ret == 0) ? "successfully" : "with error");
2342
}
1271
2343
1272
2344
end:
1273
2345
1274
2346
if(debug){
1275
fprintf(stderr, "%s exiting\n", argv[0]);
2347
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1276
2348
}
1277
2349
1278
2350
/* Cleanup things */
1295
2367
gpgme_release(mc.ctx);
1296
2368
}
1297
2369
1298
/* Removes the temp directory used by GPGME */
2370
/* Cleans up the circular linked list of Mandos servers the client
2371
has seen */
2372
if(mc.current_server != NULL){
2373
mc.current_server->prev->next = NULL;
2374
while(mc.current_server != NULL){
2375
server *next = mc.current_server->next;
2376
free(mc.current_server);
2377
mc.current_server = next;
2378
}
2379
}
2380
2381
/* Re-raise priviliges */
2382
{
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
2398
}
2399
}
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
2403
}
2404
}
2405
2406
lower_privileges_permanently();
2407
}
2408
2409
free(interfaces_to_take_down);
2410
free(interfaces_hooks);
2411
2412
/* Removes the GPGME temp directory and all files inside */
1299
2413
if(tempdir_created){
1300
DIR *d;
1301
struct dirent *direntry;
1302
d = opendir(tempdir);
1303
if(d == NULL){
1304
if(errno != ENOENT){
1305
perror("opendir");
1306
}
1307
} else {
1308
while(true){
1309
direntry = readdir(d);
1310
if(direntry == NULL){
1311
break;
1312
}
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1318
continue;
1319
}
2414
struct dirent **direntries = NULL;
2415
struct dirent *direntry = NULL;
2416
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
alphasort);
2418
if (numentries > 0){
2419
for(int i = 0; i < numentries; i++){
2420
direntry = direntries[i];
1320
2421
char *fullname = NULL;
1321
2422
ret = asprintf(&fullname, "%s/%s", tempdir,
1322
2423
direntry->d_name);
1323
2424
if(ret < 0){
1324
perror("asprintf");
2425
perror_plus("asprintf");
1325
2426
continue;
1326
2427
}
1327
2428
ret = remove(fullname);
1328
2429
if(ret == -1){
1329
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1330
strerror(errno));
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
1331
2432
}
1332
2433
free(fullname);
1333
2434
}
1334
closedir(d);
2435
}
2436
2437
/* need to clean even if 0 because man page doesn't specify */
2438
free(direntries);
2439
if (numentries == -1){
2440
perror_plus("scandir");
1335
2441
}
1336
2442
ret = rmdir(tempdir);
1337
2443
if(ret == -1 and errno != ENOENT){
1338
perror("rmdir");
1339
}
2444
perror_plus("rmdir");
2445
}
2446
}
2447
2448
if(quit_now){
2449
sigemptyset(&old_sigterm_action.sa_mask);
2450
old_sigterm_action.sa_handler = SIG_DFL;
2451
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2452
&old_sigterm_action,
2453
NULL));
2454
if(ret == -1){
2455
perror_plus("sigaction");
2456
}
2457
do {
2458
ret = raise(signal_received);
2459
} while(ret != 0 and errno == EINTR);
2460
if(ret != 0){
2461
perror_plus("raise");
2462
abort();
2463
}
2464
TEMP_FAILURE_RETRY(pause());
1340
2465
}
1341
2466
1342
2467
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0