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- Committer: Teddy Hogeborn
- Date: 2009-08-27 23:12:09 UTC
- Revision ID: teddy@fukt.bsnet.se-20090827231209-ry9loqws0gr7ze4g
* plugins.d/mandos-client.c (quit_now): Move up declaration before
first use.
(resolve_callback, ): Check "quit_now" flag.
(main): Renamed "interface_taken_up" to "take_down_interface" for
clarity. Check existence of interface before taking it up.
Set "take_down_interface" and "tempdir_created" flags before
any action is taken, to make sure cleanup is never missed.
Check "quit_now" flag throughout.
first use.
(resolve_callback, ): Check "quit_now" flag.
(main): Renamed "interface_taken_up" to "take_down_interface" for
clarity. Check existence of interface before taking it up.
Set "take_down_interface" and "tempdir_created" flags before
any action is taken, to make sure cleanup is never missed.
Check "quit_now" flag throughout.
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
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 */
71
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
74
getuid(), getgid(), setuid(),
75
setgid() */
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,
80
80
argp_parse(), ARGP_KEY_ARG,
81
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
82
#include <signal.h> /* sigemptyset(), sigaddset(),
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() */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
94
85
95
86
#ifdef __linux__
96
87
#include <sys/klog.h> /* klogctl() */
114
105
init_gnutls_session(),
115
106
GNUTLS_* */
116
107
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
119
110
120
111
/* GPGME */
121
112
#include <gpgme.h> /* All GPGME types, constants and
129
120
#define PATHDIR "/conf/conf.d/mandos"
130
121
#define SECKEY "seckey.txt"
131
122
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
123
134
124
bool debug = false;
135
125
static const char mandos_protocol_version[] = "1";
136
126
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;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
154
128
155
129
/* Used for passing in values through the Avahi callback functions */
156
130
typedef struct {
161
135
gnutls_dh_params_t dh_params;
162
136
const char *priority;
163
137
gpgme_ctx_t ctx;
164
server *current_server;
165
138
} mandos_context;
166
139
167
140
/* global context so signal handler can reach it*/
168
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
169
142
.dh_bits = 1024, .priority = "SECURE256"
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
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
194
144
195
145
/*
196
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
148
* "buffer_length" is how much is already used.
199
149
*/
200
150
size_t incbuffer(char **buffer, size_t buffer_length,
201
size_t buffer_capacity){
151
size_t buffer_capacity){
202
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
203
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
204
154
if(buffer == NULL){
209
159
return buffer_capacity;
210
160
}
211
161
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
249
162
/*
250
163
* Initialize GPGME.
251
164
*/
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
254
168
gpgme_error_t rc;
255
169
gpgme_engine_info_t engine_info;
256
170
259
173
* Helper function to insert pub and seckey to the engine keyring.
260
174
*/
261
175
bool import_key(const char *filename){
262
int ret;
263
176
int fd;
264
177
gpgme_data_t pgp_data;
265
178
266
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
267
180
if(fd == -1){
268
perror_plus("open");
181
perror("open");
269
182
return false;
270
183
}
271
184
272
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
273
186
if(rc != GPG_ERR_NO_ERROR){
274
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
276
189
return false;
277
190
}
278
191
279
192
rc = gpgme_op_import(mc.ctx, pgp_data);
280
193
if(rc != GPG_ERR_NO_ERROR){
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
283
196
return false;
284
197
}
285
198
286
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
287
200
if(ret == -1){
288
perror_plus("close");
201
perror("close");
289
202
}
290
203
gpgme_data_release(pgp_data);
291
204
return true;
292
205
}
293
206
294
207
if(debug){
295
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
296
209
}
297
210
298
211
/* Init GPGME */
299
212
gpgme_check_version(NULL);
300
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
301
214
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
304
217
return false;
305
218
}
306
219
307
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
308
221
rc = gpgme_get_engine_info(&engine_info);
309
222
if(rc != GPG_ERR_NO_ERROR){
310
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
312
225
return false;
313
226
}
314
227
while(engine_info != NULL){
320
233
engine_info = engine_info->next;
321
234
}
322
235
if(engine_info == NULL){
323
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
324
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
325
237
return false;
326
238
}
327
239
328
240
/* Create new GPGME "context" */
329
241
rc = gpgme_new(&(mc.ctx));
330
242
if(rc != GPG_ERR_NO_ERROR){
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
333
gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
334
245
return false;
335
246
}
336
247
338
249
return false;
339
250
}
340
251
341
return true;
252
return true;
342
253
}
343
254
344
255
/*
355
266
ssize_t plaintext_length = 0;
356
267
357
268
if(debug){
358
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
359
270
}
360
271
361
272
/* Create new GPGME data buffer from memory cryptotext */
362
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
363
274
0);
364
275
if(rc != GPG_ERR_NO_ERROR){
365
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
367
278
return -1;
368
279
}
369
280
370
281
/* Create new empty GPGME data buffer for the plaintext */
371
282
rc = gpgme_data_new(&dh_plain);
372
283
if(rc != GPG_ERR_NO_ERROR){
373
fprintf_plus(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_data_new: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
376
286
gpgme_data_release(dh_crypto);
377
287
return -1;
378
288
}
381
291
data buffer */
382
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
383
293
if(rc != GPG_ERR_NO_ERROR){
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
386
296
plaintext_length = -1;
387
297
if(debug){
388
298
gpgme_decrypt_result_t result;
389
299
result = gpgme_op_decrypt_result(mc.ctx);
390
300
if(result == NULL){
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
392
302
} else {
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
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
397
307
if(result->file_name != NULL){
398
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
399
309
}
400
310
gpgme_recipient_t recipient;
401
311
recipient = result->recipients;
402
312
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");
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
410
319
recipient = recipient->next;
411
320
}
412
321
}
415
324
}
416
325
417
326
if(debug){
418
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
419
328
}
420
329
421
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
422
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
423
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
424
333
plaintext_length = -1;
425
334
goto decrypt_end;
426
335
}
428
337
*plaintext = NULL;
429
338
while(true){
430
339
plaintext_capacity = incbuffer(plaintext,
431
(size_t)plaintext_length,
432
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
433
342
if(plaintext_capacity == 0){
434
perror_plus("incbuffer");
435
plaintext_length = -1;
436
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
437
346
}
438
347
439
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
444
353
break;
445
354
}
446
355
if(ret < 0){
447
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
448
357
plaintext_length = -1;
449
358
goto decrypt_end;
450
359
}
452
361
}
453
362
454
363
if(debug){
455
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
456
365
for(ssize_t i = 0; i < plaintext_length; i++){
457
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
458
367
}
470
379
}
471
380
472
381
static const char * safer_gnutls_strerror(int value){
473
const char *ret = gnutls_strerror(value);
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
474
384
if(ret == NULL)
475
385
ret = "(unknown)";
476
386
return ret;
479
389
/* GnuTLS log function callback */
480
390
static void debuggnutls(__attribute__((unused)) int level,
481
391
const char* string){
482
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
483
393
}
484
394
485
395
static int init_gnutls_global(const char *pubkeyfilename,
487
397
int ret;
488
398
489
399
if(debug){
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
491
401
}
492
402
493
403
ret = gnutls_global_init();
494
404
if(ret != GNUTLS_E_SUCCESS){
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
497
407
return -1;
498
408
}
499
409
506
416
}
507
417
508
418
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
510
420
if(ret != GNUTLS_E_SUCCESS){
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
512
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
513
426
gnutls_global_deinit();
514
427
return -1;
515
428
}
516
429
517
430
if(debug){
518
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
519
" secret key %s as GnuTLS credentials\n",
520
pubkeyfilename,
521
seckeyfilename);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
522
434
}
523
435
524
436
ret = gnutls_certificate_set_openpgp_key_file
525
437
(mc.cred, pubkeyfilename, seckeyfilename,
526
438
GNUTLS_OPENPGP_FMT_BASE64);
527
439
if(ret != GNUTLS_E_SUCCESS){
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));
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
533
445
goto globalfail;
534
446
}
535
447
536
448
/* GnuTLS server initialization */
537
449
ret = gnutls_dh_params_init(&mc.dh_params);
538
450
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
" initialization: %s\n",
541
safer_gnutls_strerror(ret));
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
542
453
goto globalfail;
543
454
}
544
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
545
456
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
548
459
goto globalfail;
549
460
}
550
461
563
474
static int init_gnutls_session(gnutls_session_t *session){
564
475
int ret;
565
476
/* GnuTLS session creation */
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);
477
ret = gnutls_init(session, GNUTLS_SERVER);
572
478
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
576
481
}
577
482
578
483
{
579
484
const char *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);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
587
486
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));
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
591
490
gnutls_deinit(*session);
592
491
return -1;
593
492
}
594
493
}
595
494
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
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
604
497
if(ret != GNUTLS_E_SUCCESS){
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
607
500
gnutls_deinit(*session);
608
501
return -1;
609
502
}
610
503
611
504
/* ignore client certificate if any. */
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
613
507
614
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
509
621
515
__attribute__((unused)) const char *txt){}
622
516
623
517
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
518
static int start_mandos_communication(const char *ip, uint16_t port,
625
519
AvahiIfIndex if_index,
626
520
int af){
627
int ret, tcp_sd = -1;
521
int ret, tcp_sd;
628
522
ssize_t sret;
629
523
union {
630
524
struct sockaddr_in in;
631
525
struct sockaddr_in6 in6;
632
526
} to;
633
527
char *buffer = NULL;
634
char *decrypted_buffer = NULL;
528
char *decrypted_buffer;
635
529
size_t buffer_length = 0;
636
530
size_t buffer_capacity = 0;
531
ssize_t decrypted_buffer_size;
637
532
size_t written;
638
int retval = -1;
533
int retval = 0;
639
534
gnutls_session_t session;
640
535
int pf; /* Protocol family */
641
536
642
errno = 0;
643
644
if(quit_now){
645
errno = EINTR;
646
return -1;
647
}
648
649
537
switch(af){
650
538
case AF_INET6:
651
539
pf = PF_INET6;
654
542
pf = PF_INET;
655
543
break;
656
544
default:
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
658
errno = EINVAL;
545
fprintf(stderr, "Bad address family: %d\n", af);
659
546
return -1;
660
547
}
661
548
665
552
}
666
553
667
554
if(debug){
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
669
PRIuMAX "\n", ip, (uintmax_t)port);
555
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
556
"\n", ip, port);
670
557
}
671
558
672
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
673
560
if(tcp_sd < 0){
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
perror("socket");
562
return -1;
683
563
}
684
564
685
565
memset(&to, 0, sizeof(to));
691
571
ret = inet_pton(af, ip, &to.in.sin_addr);
692
572
}
693
573
if(ret < 0 ){
694
int e = errno;
695
perror_plus("inet_pton");
696
errno = e;
697
goto mandos_end;
574
perror("inet_pton");
575
return -1;
698
576
}
699
577
if(ret == 0){
700
int e = errno;
701
fprintf_plus(stderr, "Bad address: %s\n", ip);
702
errno = e;
703
goto mandos_end;
578
fprintf(stderr, "Bad address: %s\n", ip);
579
return -1;
704
580
}
705
581
if(af == AF_INET6){
706
to.in6.sin6_port = htons(port);
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
583
-Wconversion and
584
-Wunreachable-code */
585
707
586
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
708
587
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
-Wunreachable-code*/
588
-Wunreachable-code*/
710
589
if(if_index == AVAHI_IF_UNSPEC){
711
fprintf_plus(stderr, "An IPv6 link-local address is"
712
" incomplete without a network interface\n");
713
errno = EINVAL;
714
goto mandos_end;
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
591
" without a network interface\n");
592
return -1;
715
593
}
716
594
/* Set the network interface number as scope */
717
595
to.in6.sin6_scope_id = (uint32_t)if_index;
722
600
-Wunreachable-code */
723
601
}
724
602
725
if(quit_now){
726
errno = EINTR;
727
goto mandos_end;
728
}
729
730
603
if(debug){
731
604
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
732
605
char interface[IF_NAMESIZE];
733
606
if(if_indextoname((unsigned int)if_index, interface) == NULL){
734
perror_plus("if_indextoname");
607
perror("if_indextoname");
735
608
} else {
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
610
ip, interface, port);
738
611
}
739
612
} else {
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
613
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
port);
742
615
}
743
616
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
744
617
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
751
624
sizeof(addrstr));
752
625
}
753
626
if(pcret == NULL){
754
perror_plus("inet_ntop");
627
perror("inet_ntop");
755
628
} else {
756
629
if(strcmp(addrstr, ip) != 0){
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
630
fprintf(stderr, "Canonical address form: %s\n", addrstr);
758
631
}
759
632
}
760
633
}
761
634
762
if(quit_now){
763
errno = EINTR;
764
goto mandos_end;
765
}
766
767
635
if(af == AF_INET6){
768
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
769
637
} else {
770
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
771
639
}
772
640
if(ret < 0){
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
perror("connect");
642
return -1;
784
643
}
785
644
786
645
const char *out = mandos_protocol_version;
788
647
while(true){
789
648
size_t out_size = strlen(out);
790
649
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
791
out_size - written));
650
out_size - written));
792
651
if(ret == -1){
793
int e = errno;
794
perror_plus("write");
795
errno = e;
652
perror("write");
653
retval = -1;
796
654
goto mandos_end;
797
655
}
798
656
written += (size_t)ret;
806
664
break;
807
665
}
808
666
}
809
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
814
667
}
815
668
816
669
if(debug){
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 {
670
fprintf(stderr, "Establishing TLS session with %s\n", ip);
671
}
672
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
674
675
do{
837
676
ret = gnutls_handshake(session);
838
if(quit_now){
839
errno = EINTR;
840
goto mandos_end;
841
}
842
677
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
843
678
844
679
if(ret != GNUTLS_E_SUCCESS){
845
680
if(debug){
846
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
681
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
847
682
gnutls_perror(ret);
848
683
}
849
errno = EPROTO;
684
retval = -1;
850
685
goto mandos_end;
851
686
}
852
687
853
688
/* Read OpenPGP packet that contains the wanted password */
854
689
855
690
if(debug){
856
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
857
" %s\n", ip);
691
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
692
ip);
858
693
}
859
694
860
695
while(true){
861
862
if(quit_now){
863
errno = EINTR;
864
goto mandos_end;
865
}
866
867
696
buffer_capacity = incbuffer(&buffer, buffer_length,
868
buffer_capacity);
697
buffer_capacity);
869
698
if(buffer_capacity == 0){
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
perror("incbuffer");
700
retval = -1;
878
701
goto mandos_end;
879
702
}
880
703
889
712
case GNUTLS_E_AGAIN:
890
713
break;
891
714
case GNUTLS_E_REHANDSHAKE:
892
do {
715
do{
893
716
ret = gnutls_handshake(session);
894
895
if(quit_now){
896
errno = EINTR;
897
goto mandos_end;
898
}
899
717
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
900
718
if(ret < 0){
901
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
902
"***\n");
719
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
903
720
gnutls_perror(ret);
904
errno = EPROTO;
721
retval = -1;
905
722
goto mandos_end;
906
723
}
907
724
break;
908
725
default:
909
fprintf_plus(stderr, "Unknown error while reading data from"
910
" encrypted session with Mandos server\n");
726
fprintf(stderr, "Unknown error while reading data from"
727
" encrypted session with Mandos server\n");
728
retval = -1;
911
729
gnutls_bye(session, GNUTLS_SHUT_RDWR);
912
errno = EIO;
913
730
goto mandos_end;
914
731
}
915
732
} else {
918
735
}
919
736
920
737
if(debug){
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);
738
fprintf(stderr, "Closing TLS session\n");
739
}
740
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
936
742
937
743
if(buffer_length > 0){
938
ssize_t decrypted_buffer_size;
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
744
decrypted_buffer_size = pgp_packet_decrypt(buffer,
745
buffer_length,
940
746
&decrypted_buffer);
941
747
if(decrypted_buffer_size >= 0){
942
943
748
written = 0;
944
749
while(written < (size_t) decrypted_buffer_size){
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
949
950
750
ret = (int)fwrite(decrypted_buffer + written, 1,
951
751
(size_t)decrypted_buffer_size - written,
952
752
stdout);
953
753
if(ret == 0 and ferror(stdout)){
954
int e = errno;
955
754
if(debug){
956
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
957
strerror(errno));
755
fprintf(stderr, "Error writing encrypted data: %s\n",
756
strerror(errno));
958
757
}
959
errno = e;
960
goto mandos_end;
758
retval = -1;
759
break;
961
760
}
962
761
written += (size_t)ret;
963
762
}
964
retval = 0;
763
free(decrypted_buffer);
764
} else {
765
retval = -1;
965
766
}
767
} else {
768
retval = -1;
966
769
}
967
770
968
771
/* Shutdown procedure */
969
772
970
773
mandos_end:
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
}
774
free(buffer);
775
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
776
if(ret == -1){
777
perror("close");
990
778
}
779
gnutls_deinit(session);
991
780
return retval;
992
781
}
993
782
783
sig_atomic_t quit_now = 0;
784
994
785
static void resolve_callback(AvahiSServiceResolver *r,
995
786
AvahiIfIndex interface,
996
787
AvahiProtocol proto,
1005
796
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1006
797
flags,
1007
798
AVAHI_GCC_UNUSED void* userdata){
1008
if(r == NULL){
1009
return;
1010
}
799
assert(r);
1011
800
1012
801
/* Called whenever a service has been resolved successfully or
1013
802
timed out */
1019
808
switch(event){
1020
809
default:
1021
810
case AVAHI_RESOLVER_FAILURE:
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)));
811
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
812
" of type '%s' in domain '%s': %s\n", name, type, domain,
813
avahi_strerror(avahi_server_errno(mc.server)));
1026
814
break;
1027
815
1028
816
case AVAHI_RESOLVER_FOUND:
1030
818
char ip[AVAHI_ADDRESS_STR_MAX];
1031
819
avahi_address_snprint(ip, sizeof(ip), address);
1032
820
if(debug){
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);
821
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
822
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
823
ip, (intmax_t)interface, port);
1036
824
}
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
interface,
825
int ret = start_mandos_communication(ip, port, interface,
1039
826
avahi_proto_to_af(proto));
1040
827
if(ret == 0){
1041
828
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
}
1048
829
}
1049
830
}
1050
831
}
1061
842
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1062
843
flags,
1063
844
AVAHI_GCC_UNUSED void* userdata){
1064
if(b == NULL){
1065
return;
1066
}
845
assert(b);
1067
846
1068
847
/* Called whenever a new services becomes available on the LAN or
1069
848
is removed from the LAN */
1070
849
1071
if(quit_now){
1072
return;
1073
}
1074
1075
850
switch(event){
1076
851
default:
1077
852
case AVAHI_BROWSER_FAILURE:
1078
853
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
854
fprintf(stderr, "(Avahi browser) %s\n",
855
avahi_strerror(avahi_server_errno(mc.server)));
1081
856
avahi_simple_poll_quit(mc.simple_poll);
1082
857
return;
1083
858
1090
865
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
866
name, type, domain, protocol, 0,
1092
867
resolve_callback, NULL) == NULL)
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
868
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
869
name, avahi_strerror(avahi_server_errno(mc.server)));
1096
870
break;
1097
871
1098
872
case AVAHI_BROWSER_REMOVE:
1101
875
case AVAHI_BROWSER_ALL_FOR_NOW:
1102
876
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1103
877
if(debug){
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
878
fprintf(stderr, "No Mandos server found, still searching...\n");
1106
879
}
1107
880
break;
1108
881
}
1109
882
}
1110
883
1111
/* Signal handler that stops main loop after SIGTERM */
1112
static void handle_sigterm(int sig){
884
/* stop main loop after sigterm has been called */
885
static void handle_sigterm(__attribute__((unused)) int sig){
1113
886
if(quit_now){
1114
887
return;
1115
888
}
1116
889
quit_now = 1;
1117
signal_received = sig;
1118
890
int old_errno = errno;
1119
/* set main loop to exit */
1120
891
if(mc.simple_poll != NULL){
1121
892
avahi_simple_poll_quit(mc.simple_poll);
1122
893
}
1123
894
errno = old_errno;
1124
895
}
1125
896
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
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
perror_plus("scandir");
1460
}
1461
} else {
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1467
if(ret < 0){
1468
perror_plus("asprintf");
1469
continue;
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1475
pid_t hook_pid = fork();
1476
if(hook_pid == 0){
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1492
dup2(devnull, STDIN_FILENO);
1493
close(devnull);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1496
if(ret == -1){
1497
perror_plus("setenv");
1498
_exit(EX_OSERR);
1499
}
1500
ret = setenv("DEVICE", interface, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("MODE", mode, 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
char *delaystring;
1516
ret = asprintf(&delaystring, "%f", delay);
1517
if(ret == -1){
1518
perror_plus("asprintf");
1519
_exit(EX_OSERR);
1520
}
1521
ret = setenv("DELAY", delaystring, 1);
1522
if(ret == -1){
1523
free(delaystring);
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
free(delaystring);
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
1539
} else {
1540
int status;
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1543
free(fullname);
1544
continue;
1545
}
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1551
free(fullname);
1552
continue;
1553
}
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1557
WTERMSIG(status));
1558
free(fullname);
1559
continue;
1560
} else {
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1563
free(fullname);
1564
continue;
1565
}
1566
}
1567
free(fullname);
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1571
}
1572
}
1573
close(devnull);
1574
}
1575
return true;
1576
}
1577
1578
error_t bring_up_interface(const char *const interface,
1579
const float delay){
1580
int sd = -1;
1581
error_t old_errno = errno;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
1584
struct ifreq network;
1585
unsigned int if_index = if_nametoindex(interface);
1586
if(if_index == 0){
1587
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1588
errno = old_errno;
1589
return ENXIO;
1590
}
1591
1592
if(quit_now){
1593
errno = old_errno;
1594
return EINTR;
1595
}
1596
1597
if(not interface_is_up(interface)){
1598
if(not get_flags(interface, &network) and debug){
1599
ret_errno = errno;
1600
fprintf_plus(stderr, "Failed to get flags for interface "
1601
"\"%s\"\n", interface);
1602
return ret_errno;
1603
}
1604
network.ifr_flags |= IFF_UP;
1605
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
1608
ret_errno = errno;
1609
perror_plus("socket");
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
1614
if(quit_now){
1615
close(sd);
1616
errno = old_errno;
1617
return EINTR;
1618
}
1619
1620
if(debug){
1621
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1622
interface);
1623
}
1624
1625
/* Raise priviliges */
1626
raise_privileges();
1627
1628
#ifdef __linux__
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
perror_plus("klogctl");
1636
}
1637
#endif /* __linux__ */
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
1640
#ifdef __linux__
1641
if(restore_loglevel){
1642
ret_linux = klogctl(7, NULL, 0);
1643
if(ret_linux == -1){
1644
perror_plus("klogctl");
1645
}
1646
}
1647
#endif /* __linux__ */
1648
1649
/* Lower privileges */
1650
lower_privileges();
1651
1652
/* Close the socket */
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1654
if(ret == -1){
1655
perror_plus("close");
1656
}
1657
1658
if(ret_setflags == -1){
1659
errno = ret_errno;
1660
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1661
errno = old_errno;
1662
return ret_errno;
1663
}
1664
} else if(debug){
1665
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1666
interface);
1667
}
1668
1669
/* Sleep checking until interface is running.
1670
Check every 0.25s, up to total time of delay */
1671
for(int i=0; i < delay * 4; i++){
1672
if(interface_is_running(interface)){
1673
break;
1674
}
1675
struct timespec sleeptime = { .tv_nsec = 250000000 };
1676
ret = nanosleep(&sleeptime, NULL);
1677
if(ret == -1 and errno != EINTR){
1678
perror_plus("nanosleep");
1679
}
1680
}
1681
1682
errno = old_errno;
1683
return 0;
1684
}
1685
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
1691
struct ifreq network;
1692
unsigned int if_index = if_nametoindex(interface);
1693
if(if_index == 0){
1694
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1695
errno = old_errno;
1696
return ENXIO;
1697
}
1698
if(interface_is_up(interface)){
1699
if(not get_flags(interface, &network) and debug){
1700
ret_errno = errno;
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1702
"\"%s\"\n", interface);
1703
return ret_errno;
1704
}
1705
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1706
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
1709
ret_errno = errno;
1710
perror_plus("socket");
1711
errno = old_errno;
1712
return ret_errno;
1713
}
1714
1715
if(debug){
1716
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1717
interface);
1718
}
1719
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
lower_privileges();
1728
1729
/* Close the socket */
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1731
if(ret == -1){
1732
perror_plus("close");
1733
}
1734
1735
if(ret_setflags == -1){
1736
errno = ret_errno;
1737
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
errno = old_errno;
1739
return ret_errno;
1740
}
1741
} else if(debug){
1742
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1743
interface);
1744
}
1745
1746
errno = old_errno;
1747
return 0;
1748
}
1749
1750
897
int main(int argc, char *argv[]){
1751
898
AvahiSServiceBrowser *sb = NULL;
1752
error_t ret_errno;
899
int error;
1753
900
int ret;
1754
901
intmax_t tmpmax;
1755
902
char *tmp;
1756
903
int exitcode = EXIT_SUCCESS;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
1759
char *interfaces_to_take_down = NULL;
1760
size_t interfaces_to_take_down_size = 0;
904
const char *interface = "eth0";
905
struct ifreq network;
906
int sd = -1;
907
bool take_down_interface = false;
908
uid_t uid;
909
gid_t gid;
910
char *connect_to = NULL;
1761
911
char tempdir[] = "/tmp/mandosXXXXXX";
1762
912
bool tempdir_created = false;
1763
913
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1764
914
const char *seckey = PATHDIR "/" SECKEY;
1765
915
const char *pubkey = PATHDIR "/" PUBKEY;
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
1768
916
1769
917
bool gnutls_initialized = false;
1770
918
bool gpgme_initialized = false;
1771
919
float delay = 2.5f;
1772
double retry_interval = 10; /* 10s between trying a server and
1773
retrying the same server again */
1774
920
1775
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
921
struct sigaction old_sigterm_action;
1776
922
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1777
923
1778
uid = getuid();
1779
gid = getgid();
1780
1781
/* Lower any group privileges we might have, just to be safe */
1782
errno = 0;
1783
ret = setgid(gid);
1784
if(ret == -1){
1785
perror_plus("setgid");
1786
}
1787
1788
/* Lower user privileges (temporarily) */
1789
errno = 0;
1790
ret = seteuid(uid);
1791
if(ret == -1){
1792
perror_plus("seteuid");
1793
}
1794
1795
if(quit_now){
1796
goto end;
1797
}
1798
1799
924
{
1800
925
struct argp_option options[] = {
1801
926
{ .name = "debug", .key = 128,
1830
955
.arg = "SECONDS",
1831
956
.doc = "Maximum delay to wait for interface startup",
1832
957
.group = 2 },
1833
{ .name = "retry", .key = 132,
1834
.arg = "SECONDS",
1835
.doc = "Retry interval used when denied by the Mandos server",
1836
.group = 2 },
1837
{ .name = "network-hook-dir", .key = 133,
1838
.arg = "DIR",
1839
.doc = "Directory where network hooks are located",
1840
.group = 2 },
1841
/*
1842
* These reproduce what we would get without ARGP_NO_HELP
1843
*/
1844
{ .name = "help", .key = '?',
1845
.doc = "Give this help list", .group = -1 },
1846
{ .name = "usage", .key = -3,
1847
.doc = "Give a short usage message", .group = -1 },
1848
{ .name = "version", .key = 'V',
1849
.doc = "Print program version", .group = -1 },
1850
958
{ .name = NULL }
1851
959
};
1852
960
1853
961
error_t parse_opt(int key, char *arg,
1854
962
struct argp_state *state){
1855
errno = 0;
1856
963
switch(key){
1857
964
case 128: /* --debug */
1858
965
debug = true;
1861
968
connect_to = arg;
1862
969
break;
1863
970
case 'i': /* --interface */
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
1866
if(ret_errno != 0){
1867
argp_error(state, "%s", strerror(ret_errno));
1868
}
971
interface = arg;
1869
972
break;
1870
973
case 's': /* --seckey */
1871
974
seckey = arg;
1878
981
tmpmax = strtoimax(arg, &tmp, 10);
1879
982
if(errno != 0 or tmp == arg or *tmp != '\0'
1880
983
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1881
argp_error(state, "Bad number of DH bits");
984
fprintf(stderr, "Bad number of DH bits\n");
985
exit(EXIT_FAILURE);
1882
986
}
1883
987
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1884
988
break;
1889
993
errno = 0;
1890
994
delay = strtof(arg, &tmp);
1891
995
if(errno != 0 or tmp == arg or *tmp != '\0'){
1892
argp_error(state, "Bad delay");
1893
}
1894
case 132: /* --retry */
1895
errno = 0;
1896
retry_interval = strtod(arg, &tmp);
1897
if(errno != 0 or tmp == arg or *tmp != '\0'
1898
or (retry_interval * 1000) > INT_MAX
1899
or retry_interval < 0){
1900
argp_error(state, "Bad retry interval");
1901
}
1902
break;
1903
case 133: /* --network-hook-dir */
1904
hookdir = arg;
1905
break;
1906
/*
1907
* These reproduce what we would get without ARGP_NO_HELP
1908
*/
1909
case '?': /* --help */
1910
argp_state_help(state, state->out_stream,
1911
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1912
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1913
case -3: /* --usage */
1914
argp_state_help(state, state->out_stream,
1915
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1916
case 'V': /* --version */
1917
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1918
exit(argp_err_exit_status);
996
fprintf(stderr, "Bad delay\n");
997
exit(EXIT_FAILURE);
998
}
999
break;
1000
case ARGP_KEY_ARG:
1001
argp_usage(state);
1002
case ARGP_KEY_END:
1919
1003
break;
1920
1004
default:
1921
1005
return ARGP_ERR_UNKNOWN;
1922
1006
}
1923
return errno;
1007
return 0;
1924
1008
}
1925
1009
1926
1010
struct argp argp = { .options = options, .parser = parse_opt,
1927
1011
.args_doc = "",
1928
1012
.doc = "Mandos client -- Get and decrypt"
1929
1013
" passwords from a Mandos server" };
1930
ret = argp_parse(&argp, argc, argv,
1931
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1932
switch(ret){
1933
case 0:
1934
break;
1935
case ENOMEM:
1936
default:
1937
errno = ret;
1938
perror_plus("argp_parse");
1939
exitcode = EX_OSERR;
1940
goto end;
1941
case EINVAL:
1942
exitcode = EX_USAGE;
1943
goto end;
1944
}
1945
}
1946
1947
{
1948
/* Work around Debian bug #633582:
1949
<http://bugs.debian.org/633582> */
1950
1951
/* Re-raise priviliges */
1952
if(raise_privileges() == 0){
1953
struct stat st;
1954
1955
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1956
int seckey_fd = open(seckey, O_RDONLY);
1957
if(seckey_fd == -1){
1958
perror_plus("open");
1959
} else {
1960
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1961
if(ret == -1){
1962
perror_plus("fstat");
1963
} else {
1964
if(S_ISREG(st.st_mode)
1965
and st.st_uid == 0 and st.st_gid == 0){
1966
ret = fchown(seckey_fd, uid, gid);
1967
if(ret == -1){
1968
perror_plus("fchown");
1969
}
1970
}
1971
}
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
1973
}
1974
}
1975
1976
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1977
int pubkey_fd = open(pubkey, O_RDONLY);
1978
if(pubkey_fd == -1){
1979
perror_plus("open");
1980
} else {
1981
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1982
if(ret == -1){
1983
perror_plus("fstat");
1984
} else {
1985
if(S_ISREG(st.st_mode)
1986
and st.st_uid == 0 and st.st_gid == 0){
1987
ret = fchown(pubkey_fd, uid, gid);
1988
if(ret == -1){
1989
perror_plus("fchown");
1990
}
1991
}
1992
}
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
1997
/* Lower privileges */
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2002
}
2003
}
2004
}
2005
2006
/* Remove empty interface names */
2007
{
2008
char *interface = NULL;
2009
while((interface = argz_next(interfaces, interfaces_size,
2010
interface))){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2013
fprintf_plus(stderr, "Not using nonexisting interface"
2014
" \"%s\"\n", interface);
2015
}
2016
argz_delete(&interfaces, &interfaces_size, interface);
2017
interface = NULL;
2018
}
2019
}
2020
}
2021
2022
/* Run network hooks */
2023
{
2024
2025
if(interfaces != NULL){
2026
interfaces_hooks = malloc(interfaces_size);
2027
if(interfaces_hooks == NULL){
2028
perror_plus("malloc");
2029
goto end;
2030
}
2031
memcpy(interfaces_hooks, interfaces, interfaces_size);
2032
interfaces_hooks_size = interfaces_size;
2033
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2034
(int)',');
2035
}
2036
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2037
interfaces_hooks : "", delay)){
1014
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1015
if(ret == ARGP_ERR_UNKNOWN){
1016
fprintf(stderr, "Unknown error while parsing arguments\n");
1017
exitcode = EXIT_FAILURE;
2038
1018
goto end;
2039
1019
}
2040
1020
}
2049
1029
srand((unsigned int) time(NULL));
2050
1030
mc.simple_poll = avahi_simple_poll_new();
2051
1031
if(mc.simple_poll == NULL){
2052
fprintf_plus(stderr,
2053
"Avahi: Failed to create simple poll object.\n");
2054
exitcode = EX_UNAVAILABLE;
1032
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1033
exitcode = EXIT_FAILURE;
2055
1034
goto end;
2056
1035
}
2057
1036
2058
1037
sigemptyset(&sigterm_action.sa_mask);
2059
1038
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2060
1039
if(ret == -1){
2061
perror_plus("sigaddset");
2062
exitcode = EX_OSERR;
1040
perror("sigaddset");
1041
exitcode = EXIT_FAILURE;
2063
1042
goto end;
2064
1043
}
2065
1044
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2066
1045
if(ret == -1){
2067
perror_plus("sigaddset");
2068
exitcode = EX_OSERR;
1046
perror("sigaddset");
1047
exitcode = EXIT_FAILURE;
2069
1048
goto end;
2070
1049
}
2071
1050
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2072
1051
if(ret == -1){
2073
perror_plus("sigaddset");
2074
exitcode = EX_OSERR;
2075
goto end;
2076
}
2077
/* Need to check if the handler is SIG_IGN before handling:
2078
| [[info:libc:Initial Signal Actions]] |
2079
| [[info:libc:Basic Signal Handling]] |
2080
*/
2081
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2082
if(ret == -1){
2083
perror_plus("sigaction");
2084
return EX_OSERR;
2085
}
2086
if(old_sigterm_action.sa_handler != SIG_IGN){
2087
ret = sigaction(SIGINT, &sigterm_action, NULL);
2088
if(ret == -1){
2089
perror_plus("sigaction");
2090
exitcode = EX_OSERR;
2091
goto end;
2092
}
2093
}
2094
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2095
if(ret == -1){
2096
perror_plus("sigaction");
2097
return EX_OSERR;
2098
}
2099
if(old_sigterm_action.sa_handler != SIG_IGN){
2100
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2101
if(ret == -1){
2102
perror_plus("sigaction");
2103
exitcode = EX_OSERR;
2104
goto end;
2105
}
2106
}
2107
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2108
if(ret == -1){
2109
perror_plus("sigaction");
2110
return EX_OSERR;
2111
}
2112
if(old_sigterm_action.sa_handler != SIG_IGN){
2113
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2114
if(ret == -1){
2115
perror_plus("sigaction");
2116
exitcode = EX_OSERR;
2117
goto end;
2118
}
2119
}
2120
2121
/* If no interfaces were specified, make a list */
2122
if(interfaces == NULL){
2123
struct dirent **direntries;
2124
/* Look for any good interfaces */
2125
ret = scandir(sys_class_net, &direntries, good_interface,
2126
alphasort);
2127
if(ret >= 1){
2128
/* Add all found interfaces to interfaces list */
2129
for(int i = 0; i < ret; ++i){
2130
ret_errno = argz_add(&interfaces, &interfaces_size,
2131
direntries[i]->d_name);
2132
if(ret_errno != 0){
2133
perror_plus("argz_add");
2134
continue;
2135
}
2136
if(debug){
2137
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2138
direntries[i]->d_name);
2139
}
2140
}
2141
free(direntries);
2142
} else {
2143
free(direntries);
2144
fprintf_plus(stderr, "Could not find a network interface\n");
2145
exitcode = EXIT_FAILURE;
2146
goto end;
2147
}
2148
}
2149
2150
/* If we only got one interface, explicitly use only that one */
2151
if(argz_count(interfaces, interfaces_size) == 1){
2152
if(debug){
2153
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2154
interfaces);
2155
}
2156
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2157
}
2158
2159
/* Bring up interfaces which are down */
2160
if(not (argz_count(interfaces, interfaces_size) == 1
2161
and strcmp(interfaces, "none") == 0)){
2162
char *interface = NULL;
2163
while((interface = argz_next(interfaces, interfaces_size,
2164
interface))){
2165
bool interface_was_up = interface_is_up(interface);
2166
ret = bring_up_interface(interface, delay);
2167
if(not interface_was_up){
2168
if(ret != 0){
2169
errno = ret;
2170
perror_plus("Failed to bring up interface");
2171
} else {
2172
ret_errno = argz_add(&interfaces_to_take_down,
2173
&interfaces_to_take_down_size,
2174
interface);
2175
}
2176
}
2177
}
2178
free(interfaces);
2179
interfaces = NULL;
2180
interfaces_size = 0;
2181
if(debug and (interfaces_to_take_down == NULL)){
2182
fprintf_plus(stderr, "No interfaces were brought up\n");
2183
}
1052
perror("sigaddset");
1053
exitcode = EXIT_FAILURE;
1054
goto end;
1055
}
1056
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1057
if(ret == -1){
1058
perror("sigaction");
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* If the interface is down, bring it up */
1064
if(interface[0] != '\0'){
1065
if_index = (AvahiIfIndex) if_nametoindex(interface);
1066
if(if_index == 0){
1067
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
if(quit_now){
1073
goto end;
1074
}
1075
1076
#ifdef __linux__
1077
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1078
messages to mess up the prompt */
1079
ret = klogctl(8, NULL, 5);
1080
bool restore_loglevel = true;
1081
if(ret == -1){
1082
restore_loglevel = false;
1083
perror("klogctl");
1084
}
1085
#endif /* __linux__ */
1086
1087
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1088
if(sd < 0){
1089
perror("socket");
1090
exitcode = EXIT_FAILURE;
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
goto end;
1100
}
1101
strcpy(network.ifr_name, interface);
1102
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1103
if(ret == -1){
1104
perror("ioctl SIOCGIFFLAGS");
1105
#ifdef __linux__
1106
if(restore_loglevel){
1107
ret = klogctl(7, NULL, 0);
1108
if(ret == -1){
1109
perror("klogctl");
1110
}
1111
}
1112
#endif /* __linux__ */
1113
exitcode = EXIT_FAILURE;
1114
goto end;
1115
}
1116
if((network.ifr_flags & IFF_UP) == 0){
1117
network.ifr_flags |= IFF_UP;
1118
take_down_interface = true;
1119
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1120
if(ret == -1){
1121
take_down_interface = false;
1122
perror("ioctl SIOCSIFFLAGS");
1123
exitcode = EXIT_FAILURE;
1124
#ifdef __linux__
1125
if(restore_loglevel){
1126
ret = klogctl(7, NULL, 0);
1127
if(ret == -1){
1128
perror("klogctl");
1129
}
1130
}
1131
#endif /* __linux__ */
1132
goto end;
1133
}
1134
}
1135
/* sleep checking until interface is running */
1136
for(int i=0; i < delay * 4; i++){
1137
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1138
if(ret == -1){
1139
perror("ioctl SIOCGIFFLAGS");
1140
} else if(network.ifr_flags & IFF_RUNNING){
1141
break;
1142
}
1143
struct timespec sleeptime = { .tv_nsec = 250000000 };
1144
ret = nanosleep(&sleeptime, NULL);
1145
if(ret == -1 and errno != EINTR){
1146
perror("nanosleep");
1147
}
1148
}
1149
if(not take_down_interface){
1150
/* We won't need the socket anymore */
1151
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1152
if(ret == -1){
1153
perror("close");
1154
}
1155
}
1156
#ifdef __linux__
1157
if(restore_loglevel){
1158
/* Restores kernel loglevel to default */
1159
ret = klogctl(7, NULL, 0);
1160
if(ret == -1){
1161
perror("klogctl");
1162
}
1163
}
1164
#endif /* __linux__ */
1165
}
1166
1167
if(quit_now){
1168
goto end;
1169
}
1170
1171
uid = getuid();
1172
gid = getgid();
1173
1174
errno = 0;
1175
setgid(gid);
1176
if(ret == -1){
1177
perror("setgid");
1178
}
1179
1180
ret = setuid(uid);
1181
if(ret == -1){
1182
perror("setuid");
2184
1183
}
2185
1184
2186
1185
if(quit_now){
2189
1188
2190
1189
ret = init_gnutls_global(pubkey, seckey);
2191
1190
if(ret == -1){
2192
fprintf_plus(stderr, "init_gnutls_global failed\n");
2193
exitcode = EX_UNAVAILABLE;
1191
fprintf(stderr, "init_gnutls_global failed\n");
1192
exitcode = EXIT_FAILURE;
2194
1193
goto end;
2195
1194
} else {
2196
1195
gnutls_initialized = true;
2200
1199
goto end;
2201
1200
}
2202
1201
1202
tempdir_created = true;
2203
1203
if(mkdtemp(tempdir) == NULL){
2204
perror_plus("mkdtemp");
1204
tempdir_created = false;
1205
perror("mkdtemp");
2205
1206
goto end;
2206
1207
}
2207
tempdir_created = true;
2208
1208
2209
1209
if(quit_now){
2210
1210
goto end;
2211
1211
}
2212
1212
2213
1213
if(not init_gpgme(pubkey, seckey, tempdir)){
2214
fprintf_plus(stderr, "init_gpgme failed\n");
2215
exitcode = EX_UNAVAILABLE;
1214
fprintf(stderr, "init_gpgme failed\n");
1215
exitcode = EXIT_FAILURE;
2216
1216
goto end;
2217
1217
} else {
2218
1218
gpgme_initialized = true;
2226
1226
/* Connect directly, do not use Zeroconf */
2227
1227
/* (Mainly meant for debugging) */
2228
1228
char *address = strrchr(connect_to, ':');
2229
2230
1229
if(address == NULL){
2231
fprintf_plus(stderr, "No colon in address\n");
2232
exitcode = EX_USAGE;
1230
fprintf(stderr, "No colon in address\n");
1231
exitcode = EXIT_FAILURE;
2233
1232
goto end;
2234
1233
}
2235
1234
2237
1236
goto end;
2238
1237
}
2239
1238
2240
in_port_t port;
1239
uint16_t port;
2241
1240
errno = 0;
2242
1241
tmpmax = strtoimax(address+1, &tmp, 10);
2243
1242
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2244
or tmpmax != (in_port_t)tmpmax){
2245
fprintf_plus(stderr, "Bad port number\n");
2246
exitcode = EX_USAGE;
1243
or tmpmax != (uint16_t)tmpmax){
1244
fprintf(stderr, "Bad port number\n");
1245
exitcode = EXIT_FAILURE;
2247
1246
goto end;
2248
1247
}
2249
1248
2251
1250
goto end;
2252
1251
}
2253
1252
2254
port = (in_port_t)tmpmax;
1253
port = (uint16_t)tmpmax;
2255
1254
*address = '\0';
1255
address = connect_to;
2256
1256
/* Colon in address indicates IPv6 */
2257
1257
int af;
2258
if(strchr(connect_to, ':') != NULL){
1258
if(strchr(address, ':') != NULL){
2259
1259
af = AF_INET6;
2260
/* Accept [] around IPv6 address - see RFC 5952 */
2261
if(connect_to[0] == '[' and address[-1] == ']')
2262
{
2263
connect_to++;
2264
address[-1] = '\0';
2265
}
2266
1260
} else {
2267
1261
af = AF_INET;
2268
1262
}
2269
address = connect_to;
2270
1263
2271
1264
if(quit_now){
2272
1265
goto end;
2273
1266
}
2274
1267
2275
while(not quit_now){
2276
ret = start_mandos_communication(address, port, if_index, af);
2277
if(quit_now or ret == 0){
2278
break;
2279
}
2280
if(debug){
2281
fprintf_plus(stderr, "Retrying in %d seconds\n",
2282
(int)retry_interval);
2283
}
2284
sleep((int)retry_interval);
2285
}
2286
2287
if (not quit_now){
1268
ret = start_mandos_communication(address, port, if_index, af);
1269
if(ret < 0){
1270
exitcode = EXIT_FAILURE;
1271
} else {
2288
1272
exitcode = EXIT_SUCCESS;
2289
1273
}
2290
2291
1274
goto end;
2292
1275
}
2293
1276
2307
1290
/* Allocate a new server */
2308
1291
mc.server = avahi_server_new(avahi_simple_poll_get
2309
1292
(mc.simple_poll), &config, NULL,
2310
NULL, &ret_errno);
1293
NULL, &error);
2311
1294
2312
1295
/* Free the Avahi configuration data */
2313
1296
avahi_server_config_free(&config);
2315
1298
2316
1299
/* Check if creating the Avahi server object succeeded */
2317
1300
if(mc.server == NULL){
2318
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2319
avahi_strerror(ret_errno));
2320
exitcode = EX_UNAVAILABLE;
1301
fprintf(stderr, "Failed to create Avahi server: %s\n",
1302
avahi_strerror(error));
1303
exitcode = EXIT_FAILURE;
2321
1304
goto end;
2322
1305
}
2323
1306
2330
1313
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2331
1314
NULL, 0, browse_callback, NULL);
2332
1315
if(sb == NULL){
2333
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2334
avahi_strerror(avahi_server_errno(mc.server)));
2335
exitcode = EX_UNAVAILABLE;
1316
fprintf(stderr, "Failed to create service browser: %s\n",
1317
avahi_strerror(avahi_server_errno(mc.server)));
1318
exitcode = EXIT_FAILURE;
2336
1319
goto end;
2337
1320
}
2338
1321
2343
1326
/* Run the main loop */
2344
1327
2345
1328
if(debug){
2346
fprintf_plus(stderr, "Starting Avahi loop search\n");
2347
}
2348
2349
ret = avahi_loop_with_timeout(mc.simple_poll,
2350
(int)(retry_interval * 1000));
2351
if(debug){
2352
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2353
(ret == 0) ? "successfully" : "with error");
2354
}
1329
fprintf(stderr, "Starting Avahi loop search\n");
1330
}
1331
1332
avahi_simple_poll_loop(mc.simple_poll);
2355
1333
2356
1334
end:
2357
1335
2358
1336
if(debug){
2359
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1337
fprintf(stderr, "%s exiting\n", argv[0]);
2360
1338
}
2361
1339
2362
1340
/* Cleanup things */
2379
1357
gpgme_release(mc.ctx);
2380
1358
}
2381
1359
2382
/* Cleans up the circular linked list of Mandos servers the client
2383
has seen */
2384
if(mc.current_server != NULL){
2385
mc.current_server->prev->next = NULL;
2386
while(mc.current_server != NULL){
2387
server *next = mc.current_server->next;
2388
free(mc.current_server);
2389
mc.current_server = next;
2390
}
2391
}
2392
2393
/* Re-raise priviliges */
2394
{
2395
raise_privileges();
2396
2397
/* Run network hooks */
2398
run_network_hooks("stop", interfaces_hooks != NULL ?
2399
interfaces_hooks : "", delay);
2400
2401
/* Take down the network interfaces which were brought up */
2402
{
2403
char *interface = NULL;
2404
while((interface=argz_next(interfaces_to_take_down,
2405
interfaces_to_take_down_size,
2406
interface))){
2407
ret_errno = take_down_interface(interface);
2408
if(ret_errno != 0){
2409
errno = ret_errno;
2410
perror_plus("Failed to take down interface");
2411
}
2412
}
2413
if(debug and (interfaces_to_take_down == NULL)){
2414
fprintf_plus(stderr, "No interfaces needed to be taken"
2415
" down\n");
2416
}
2417
}
2418
2419
lower_privileges_permanently();
2420
}
2421
2422
free(interfaces_to_take_down);
2423
free(interfaces_hooks);
2424
2425
/* Removes the GPGME temp directory and all files inside */
1360
/* Take down the network interface */
1361
if(take_down_interface){
1362
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1363
if(ret == -1){
1364
perror("ioctl SIOCGIFFLAGS");
1365
} else if(network.ifr_flags & IFF_UP) {
1366
network.ifr_flags &= ~IFF_UP; /* clear flag */
1367
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1368
if(ret == -1){
1369
perror("ioctl SIOCSIFFLAGS");
1370
}
1371
}
1372
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1373
if(ret == -1){
1374
perror("close");
1375
}
1376
}
1377
1378
/* Removes the temp directory used by GPGME */
2426
1379
if(tempdir_created){
2427
struct dirent **direntries = NULL;
2428
struct dirent *direntry = NULL;
2429
int numentries = scandir(tempdir, &direntries, notdotentries,
2430
alphasort);
2431
if (numentries > 0){
2432
for(int i = 0; i < numentries; i++){
2433
direntry = direntries[i];
1380
DIR *d;
1381
struct dirent *direntry;
1382
d = opendir(tempdir);
1383
if(d == NULL){
1384
if(errno != ENOENT){
1385
perror("opendir");
1386
}
1387
} else {
1388
while(true){
1389
direntry = readdir(d);
1390
if(direntry == NULL){
1391
break;
1392
}
1393
/* Skip "." and ".." */
1394
if(direntry->d_name[0] == '.'
1395
and (direntry->d_name[1] == '\0'
1396
or (direntry->d_name[1] == '.'
1397
and direntry->d_name[2] == '\0'))){
1398
continue;
1399
}
2434
1400
char *fullname = NULL;
2435
1401
ret = asprintf(&fullname, "%s/%s", tempdir,
2436
1402
direntry->d_name);
2437
1403
if(ret < 0){
2438
perror_plus("asprintf");
1404
perror("asprintf");
2439
1405
continue;
2440
1406
}
2441
1407
ret = remove(fullname);
2442
1408
if(ret == -1){
2443
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2444
strerror(errno));
1409
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1410
strerror(errno));
2445
1411
}
2446
1412
free(fullname);
2447
1413
}
2448
}
2449
2450
/* need to clean even if 0 because man page doesn't specify */
2451
free(direntries);
2452
if (numentries == -1){
2453
perror_plus("scandir");
1414
closedir(d);
2454
1415
}
2455
1416
ret = rmdir(tempdir);
2456
1417
if(ret == -1 and errno != ENOENT){
2457
perror_plus("rmdir");
2458
}
2459
}
2460
2461
if(quit_now){
2462
sigemptyset(&old_sigterm_action.sa_mask);
2463
old_sigterm_action.sa_handler = SIG_DFL;
2464
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2465
&old_sigterm_action,
2466
NULL));
2467
if(ret == -1){
2468
perror_plus("sigaction");
2469
}
2470
do {
2471
ret = raise(signal_received);
2472
} while(ret != 0 and errno == EINTR);
2473
if(ret != 0){
2474
perror_plus("raise");
2475
abort();
2476
}
2477
TEMP_FAILURE_RETRY(pause());
1418
perror("rmdir");
1419
}
2478
1420
}
2479
1421
2480
1422
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0