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237.7.145
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2012-06-14 17:03:12 UTC
- mto: (301.1.1 release) (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 302.
- 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() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
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 <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
69
69
if_nametoindex(), IF_NAMESIZE */
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
77
#include <iso646.h> /* not, or, and */
78
78
#include <argp.h> /* struct argp_option, error_t, struct
79
79
argp_state, struct argp,
84
84
raise() */
85
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
87
94
88
95
#ifdef __linux__
89
96
#include <sys/klog.h> /* klogctl() */
107
114
init_gnutls_session(),
108
115
GNUTLS_* */
109
116
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
112
119
113
120
/* GPGME */
114
121
#include <gpgme.h> /* All GPGME types, constants and
122
129
#define PATHDIR "/conf/conf.d/mandos"
123
130
#define SECKEY "seckey.txt"
124
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
133
126
134
bool debug = false;
127
135
static const char mandos_protocol_version[] = "1";
128
136
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
138
static const char sys_class_net[] = "/sys/class/net";
131
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;
132
154
133
155
/* Used for passing in values through the Avahi callback functions */
134
156
typedef struct {
139
161
gnutls_dh_params_t dh_params;
140
162
const char *priority;
141
163
gpgme_ctx_t ctx;
164
server *current_server;
142
165
} mandos_context;
143
166
144
167
/* global context so signal handler can reach it*/
145
168
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
169
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
148
172
149
173
sig_atomic_t quit_now = 0;
150
174
int signal_received = 0;
151
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
}
194
152
195
/*
153
196
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
197
* bytes. "buffer_capacity" is how much is currently allocated,
155
198
* "buffer_length" is how much is already used.
156
199
*/
157
200
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
201
size_t buffer_capacity){
159
202
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
204
if(buffer == NULL){
166
209
return buffer_capacity;
167
210
}
168
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
169
249
/*
170
250
* Initialize GPGME.
171
251
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
174
254
gpgme_error_t rc;
175
255
gpgme_engine_info_t engine_info;
176
256
185
265
186
266
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
267
if(fd == -1){
188
perror("open");
268
perror_plus("open");
189
269
return false;
190
270
}
191
271
192
272
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
273
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
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));
196
276
return false;
197
277
}
198
278
199
279
rc = gpgme_op_import(mc.ctx, pgp_data);
200
280
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
203
283
return false;
204
284
}
205
285
206
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
287
if(ret == -1){
208
perror("close");
288
perror_plus("close");
209
289
}
210
290
gpgme_data_release(pgp_data);
211
291
return true;
212
292
}
213
293
214
294
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
295
fprintf_plus(stderr, "Initializing GPGME\n");
216
296
}
217
297
218
298
/* Init GPGME */
219
299
gpgme_check_version(NULL);
220
300
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
301
if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
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));
224
304
return false;
225
305
}
226
306
227
/* Set GPGME home directory for the OpenPGP engine only */
307
/* Set GPGME home directory for the OpenPGP engine only */
228
308
rc = gpgme_get_engine_info(&engine_info);
229
309
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
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));
232
312
return false;
233
313
}
234
314
while(engine_info != NULL){
240
320
engine_info = engine_info->next;
241
321
}
242
322
if(engine_info == NULL){
243
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);
244
325
return false;
245
326
}
246
327
247
328
/* Create new GPGME "context" */
248
329
rc = gpgme_new(&(mc.ctx));
249
330
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
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));
252
334
return false;
253
335
}
254
336
273
355
ssize_t plaintext_length = 0;
274
356
275
357
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
358
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
277
359
}
278
360
279
361
/* Create new GPGME data buffer from memory cryptotext */
280
362
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
363
0);
282
364
if(rc != GPG_ERR_NO_ERROR){
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
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));
285
367
return -1;
286
368
}
287
369
288
370
/* Create new empty GPGME data buffer for the plaintext */
289
371
rc = gpgme_data_new(&dh_plain);
290
372
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
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));
293
376
gpgme_data_release(dh_crypto);
294
377
return -1;
295
378
}
298
381
data buffer */
299
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
383
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
303
386
plaintext_length = -1;
304
387
if(debug){
305
388
gpgme_decrypt_result_t result;
306
389
result = gpgme_op_decrypt_result(mc.ctx);
307
390
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
309
392
} else {
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
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);
314
397
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
398
fprintf_plus(stderr, "File name: %s\n", result->file_name);
316
399
}
317
400
gpgme_recipient_t recipient;
318
401
recipient = result->recipients;
319
402
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
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");
326
410
recipient = recipient->next;
327
411
}
328
412
}
331
415
}
332
416
333
417
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
418
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
335
419
}
336
420
337
421
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
422
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
423
perror_plus("gpgme_data_seek");
340
424
plaintext_length = -1;
341
425
goto decrypt_end;
342
426
}
344
428
*plaintext = NULL;
345
429
while(true){
346
430
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
431
(size_t)plaintext_length,
432
plaintext_capacity);
349
433
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
434
perror_plus("incbuffer");
435
plaintext_length = -1;
436
goto decrypt_end;
353
437
}
354
438
355
439
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
360
444
break;
361
445
}
362
446
if(ret < 0){
363
perror("gpgme_data_read");
447
perror_plus("gpgme_data_read");
364
448
plaintext_length = -1;
365
449
goto decrypt_end;
366
450
}
368
452
}
369
453
370
454
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
455
fprintf_plus(stderr, "Decrypted password is: ");
372
456
for(ssize_t i = 0; i < plaintext_length; i++){
373
457
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
458
}
386
470
}
387
471
388
472
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
473
const char *ret = gnutls_strerror(value);
391
474
if(ret == NULL)
392
475
ret = "(unknown)";
393
476
return ret;
396
479
/* GnuTLS log function callback */
397
480
static void debuggnutls(__attribute__((unused)) int level,
398
481
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
482
fprintf_plus(stderr, "GnuTLS: %s", string);
400
483
}
401
484
402
485
static int init_gnutls_global(const char *pubkeyfilename,
404
487
int ret;
405
488
406
489
if(debug){
407
fprintf(stderr, "Initializing GnuTLS\n");
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
408
491
}
409
492
410
493
ret = gnutls_global_init();
411
494
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
414
497
return -1;
415
498
}
416
499
423
506
}
424
507
425
508
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
427
510
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
512
safer_gnutls_strerror(ret));
433
513
gnutls_global_deinit();
434
514
return -1;
435
515
}
436
516
437
517
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
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);
441
522
}
442
523
443
524
ret = gnutls_certificate_set_openpgp_key_file
444
525
(mc.cred, pubkeyfilename, seckeyfilename,
445
526
GNUTLS_OPENPGP_FMT_BASE64);
446
527
if(ret != GNUTLS_E_SUCCESS){
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
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));
452
533
goto globalfail;
453
534
}
454
535
455
536
/* GnuTLS server initialization */
456
537
ret = gnutls_dh_params_init(&mc.dh_params);
457
538
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
" initialization: %s\n",
541
safer_gnutls_strerror(ret));
460
542
goto globalfail;
461
543
}
462
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
545
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
466
548
goto globalfail;
467
549
}
468
550
488
570
}
489
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
572
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
493
576
}
494
577
495
578
{
502
585
}
503
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
587
if(ret != GNUTLS_E_SUCCESS){
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
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));
508
591
gnutls_deinit(*session);
509
592
return -1;
510
593
}
519
602
}
520
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
604
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
524
607
gnutls_deinit(*session);
525
608
return -1;
526
609
}
538
621
__attribute__((unused)) const char *txt){}
539
622
540
623
/* Called when a Mandos server is found */
541
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
542
625
AvahiIfIndex if_index,
543
626
int af){
544
627
int ret, tcp_sd = -1;
571
654
pf = PF_INET;
572
655
break;
573
656
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
575
658
errno = EINVAL;
576
659
return -1;
577
660
}
582
665
}
583
666
584
667
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
669
PRIuMAX "\n", ip, (uintmax_t)port);
587
670
}
588
671
589
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
673
if(tcp_sd < 0){
591
674
int e = errno;
592
perror("socket");
675
perror_plus("socket");
593
676
errno = e;
594
677
goto mandos_end;
595
678
}
609
692
}
610
693
if(ret < 0 ){
611
694
int e = errno;
612
perror("inet_pton");
695
perror_plus("inet_pton");
613
696
errno = e;
614
697
goto mandos_end;
615
698
}
616
699
if(ret == 0){
617
700
int e = errno;
618
fprintf(stderr, "Bad address: %s\n", ip);
701
fprintf_plus(stderr, "Bad address: %s\n", ip);
619
702
errno = e;
620
703
goto mandos_end;
621
704
}
622
705
if(af == AF_INET6){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
706
to.in6.sin6_port = htons(port);
627
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
709
-Wunreachable-code*/
630
710
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
711
fprintf_plus(stderr, "An IPv6 link-local address is"
712
" incomplete without a network interface\n");
633
713
errno = EINVAL;
634
714
goto mandos_end;
635
715
}
651
731
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
732
char interface[IF_NAMESIZE];
653
733
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
734
perror_plus("if_indextoname");
655
735
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
658
738
}
659
739
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
662
742
}
663
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
671
751
sizeof(addrstr));
672
752
}
673
753
if(pcret == NULL){
674
perror("inet_ntop");
754
perror_plus("inet_ntop");
675
755
} else {
676
756
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
678
758
}
679
759
}
680
760
}
690
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
771
}
692
772
if(ret < 0){
693
int e = errno;
694
perror("connect");
695
errno = e;
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
696
778
goto mandos_end;
697
779
}
698
780
706
788
while(true){
707
789
size_t out_size = strlen(out);
708
790
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
709
out_size - written));
791
out_size - written));
710
792
if(ret == -1){
711
793
int e = errno;
712
perror("write");
794
perror_plus("write");
713
795
errno = e;
714
796
goto mandos_end;
715
797
}
732
814
}
733
815
734
816
if(debug){
735
fprintf(stderr, "Establishing TLS session with %s\n", ip);
817
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
736
818
}
737
819
738
820
if(quit_now){
740
822
goto mandos_end;
741
823
}
742
824
743
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
744
830
745
831
if(quit_now){
746
832
errno = EINTR;
757
843
758
844
if(ret != GNUTLS_E_SUCCESS){
759
845
if(debug){
760
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
846
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
761
847
gnutls_perror(ret);
762
848
}
763
849
errno = EPROTO;
767
853
/* Read OpenPGP packet that contains the wanted password */
768
854
769
855
if(debug){
770
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
771
ip);
856
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
857
" %s\n", ip);
772
858
}
773
859
774
860
while(true){
779
865
}
780
866
781
867
buffer_capacity = incbuffer(&buffer, buffer_length,
782
buffer_capacity);
868
buffer_capacity);
783
869
if(buffer_capacity == 0){
784
870
int e = errno;
785
perror("incbuffer");
871
perror_plus("incbuffer");
786
872
errno = e;
787
873
goto mandos_end;
788
874
}
812
898
}
813
899
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
814
900
if(ret < 0){
815
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
902
"***\n");
816
903
gnutls_perror(ret);
817
904
errno = EPROTO;
818
905
goto mandos_end;
819
906
}
820
907
break;
821
908
default:
822
fprintf(stderr, "Unknown error while reading data from"
823
" encrypted session with Mandos server\n");
909
fprintf_plus(stderr, "Unknown error while reading data from"
910
" encrypted session with Mandos server\n");
824
911
gnutls_bye(session, GNUTLS_SHUT_RDWR);
825
912
errno = EIO;
826
913
goto mandos_end;
831
918
}
832
919
833
920
if(debug){
834
fprintf(stderr, "Closing TLS session\n");
921
fprintf_plus(stderr, "Closing TLS session\n");
835
922
}
836
923
837
924
if(quit_now){
849
936
850
937
if(buffer_length > 0){
851
938
ssize_t decrypted_buffer_size;
852
decrypted_buffer_size = pgp_packet_decrypt(buffer,
853
buffer_length,
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
854
940
&decrypted_buffer);
855
941
if(decrypted_buffer_size >= 0){
856
942
867
953
if(ret == 0 and ferror(stdout)){
868
954
int e = errno;
869
955
if(debug){
870
fprintf(stderr, "Error writing encrypted data: %s\n",
871
strerror(errno));
956
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
957
strerror(errno));
872
958
}
873
959
errno = e;
874
960
goto mandos_end;
893
979
if(e == 0){
894
980
e = errno;
895
981
}
896
perror("close");
982
perror_plus("close");
897
983
}
898
984
gnutls_deinit(session);
985
errno = e;
899
986
if(quit_now){
900
e = EINTR;
987
errno = EINTR;
901
988
retval = -1;
902
989
}
903
errno = e;
904
990
}
905
991
return retval;
906
992
}
919
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
1006
flags,
921
1007
AVAHI_GCC_UNUSED void* userdata){
922
assert(r);
1008
if(r == NULL){
1009
return;
1010
}
923
1011
924
1012
/* Called whenever a service has been resolved successfully or
925
1013
timed out */
931
1019
switch(event){
932
1020
default:
933
1021
case AVAHI_RESOLVER_FAILURE:
934
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
935
" of type '%s' in domain '%s': %s\n", name, type, domain,
936
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)));
937
1026
break;
938
1027
939
1028
case AVAHI_RESOLVER_FOUND:
941
1030
char ip[AVAHI_ADDRESS_STR_MAX];
942
1031
avahi_address_snprint(ip, sizeof(ip), address);
943
1032
if(debug){
944
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
945
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
946
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);
947
1036
}
948
int ret = start_mandos_communication(ip, port, interface,
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
interface,
949
1039
avahi_proto_to_af(proto));
950
1040
if(ret == 0){
951
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
}
952
1048
}
953
1049
}
954
1050
}
965
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
966
1062
flags,
967
1063
AVAHI_GCC_UNUSED void* userdata){
968
assert(b);
1064
if(b == NULL){
1065
return;
1066
}
969
1067
970
1068
/* Called whenever a new services becomes available on the LAN or
971
1069
is removed from the LAN */
978
1076
default:
979
1077
case AVAHI_BROWSER_FAILURE:
980
1078
981
fprintf(stderr, "(Avahi browser) %s\n",
982
avahi_strerror(avahi_server_errno(mc.server)));
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
983
1081
avahi_simple_poll_quit(mc.simple_poll);
984
1082
return;
985
1083
992
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
993
1091
name, type, domain, protocol, 0,
994
1092
resolve_callback, NULL) == NULL)
995
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
996
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)));
997
1096
break;
998
1097
999
1098
case AVAHI_BROWSER_REMOVE:
1002
1101
case AVAHI_BROWSER_ALL_FOR_NOW:
1003
1102
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1004
1103
if(debug){
1005
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
1006
1106
}
1007
1107
break;
1008
1108
}
1009
1109
}
1010
1110
1011
/* stop main loop after sigterm has been called */
1111
/* Signal handler that stops main loop after SIGTERM */
1012
1112
static void handle_sigterm(int sig){
1013
1113
if(quit_now){
1014
1114
return;
1016
1116
quit_now = 1;
1017
1117
signal_received = sig;
1018
1118
int old_errno = errno;
1119
/* set main loop to exit */
1019
1120
if(mc.simple_poll != NULL){
1020
1121
avahi_simple_poll_quit(mc.simple_poll);
1021
1122
}
1022
1123
errno = old_errno;
1023
1124
}
1024
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
1025
1192
/*
1026
1193
* This function determines if a directory entry in /sys/class/net
1027
1194
* corresponds to an acceptable network device.
1028
1195
* (This function is passed to scandir(3) as a filter function.)
1029
1196
*/
1030
1197
int good_interface(const struct dirent *if_entry){
1031
ssize_t ssret;
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
if_entry->d_name);
1035
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1039
1198
if(if_entry->d_name[0] == '.'){
1040
1199
return 0;
1041
1200
}
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
if(flags_fd == -1){
1044
perror("open");
1045
return 0;
1046
}
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1053
perror("malloc");
1054
close(flags_fd);
1055
return 0;
1056
}
1057
while(to_read > 0){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
(size_t)to_read));
1060
if(ssret == -1){
1061
perror("read");
1062
free(flagstring);
1063
close(flags_fd);
1064
return 0;
1065
}
1066
to_read -= ssret;
1067
if(ssret == 0){
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)){
1068
1666
break;
1069
1667
}
1070
}
1071
close(flags_fd);
1072
intmax_t tmpmax;
1073
char *tmp;
1074
errno = 0;
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1079
if(debug){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1082
}
1083
free(flagstring);
1084
return 0;
1085
}
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1088
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1090
if(debug){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1093
}
1094
return 0;
1095
}
1096
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1098
if(debug){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1101
}
1102
return 1;
1103
}
1104
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1106
if(debug){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1108
if_entry->d_name);
1109
}
1110
return 0;
1111
}
1112
/* Accept this device */
1113
if(debug){
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1116
}
1117
return 1;
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;
1118
1741
}
1119
1742
1120
1743
int main(int argc, char *argv[]){
1121
1744
AvahiSServiceBrowser *sb = NULL;
1122
int error;
1745
error_t ret_errno;
1123
1746
int ret;
1124
1747
intmax_t tmpmax;
1125
1748
char *tmp;
1126
1749
int exitcode = EXIT_SUCCESS;
1127
const char *interface = "";
1128
struct ifreq network;
1129
int sd = -1;
1130
bool take_down_interface = false;
1131
uid_t uid;
1132
gid_t gid;
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;
1133
1754
char tempdir[] = "/tmp/mandosXXXXXX";
1134
1755
bool tempdir_created = false;
1135
1756
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1136
1757
const char *seckey = PATHDIR "/" SECKEY;
1137
1758
const char *pubkey = PATHDIR "/" PUBKEY;
1759
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
1138
1761
1139
1762
bool gnutls_initialized = false;
1140
1763
bool gpgme_initialized = false;
1141
1764
float delay = 2.5f;
1765
double retry_interval = 10; /* 10s between trying a server and
1766
retrying the same server again */
1142
1767
1143
1768
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1144
1769
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1150
1775
errno = 0;
1151
1776
ret = setgid(gid);
1152
1777
if(ret == -1){
1153
perror("setgid");
1778
perror_plus("setgid");
1154
1779
}
1155
1780
1156
1781
/* Lower user privileges (temporarily) */
1157
1782
errno = 0;
1158
1783
ret = seteuid(uid);
1159
1784
if(ret == -1){
1160
perror("seteuid");
1785
perror_plus("seteuid");
1161
1786
}
1162
1787
1163
1788
if(quit_now){
1198
1823
.arg = "SECONDS",
1199
1824
.doc = "Maximum delay to wait for interface startup",
1200
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 },
1201
1834
/*
1202
1835
* These reproduce what we would get without ARGP_NO_HELP
1203
1836
*/
1221
1854
connect_to = arg;
1222
1855
break;
1223
1856
case 'i': /* --interface */
1224
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
}
1225
1862
break;
1226
1863
case 's': /* --seckey */
1227
1864
seckey = arg;
1247
1884
if(errno != 0 or tmp == arg or *tmp != '\0'){
1248
1885
argp_error(state, "Bad delay");
1249
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;
1250
1898
break;
1251
1899
/*
1252
1900
* These reproduce what we would get without ARGP_NO_HELP
1259
1907
argp_state_help(state, state->out_stream,
1260
1908
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1261
1909
case 'V': /* --version */
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
1910
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1263
1911
exit(argp_err_exit_status);
1264
1912
break;
1265
1913
default:
1280
1928
case ENOMEM:
1281
1929
default:
1282
1930
errno = ret;
1283
perror("argp_parse");
1931
perror_plus("argp_parse");
1284
1932
exitcode = EX_OSERR;
1285
1933
goto end;
1286
1934
case EINVAL:
1288
1936
goto end;
1289
1937
}
1290
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)){
2026
goto end;
2027
}
2028
}
1291
2029
1292
2030
if(not debug){
1293
2031
avahi_set_log_function(empty_log);
1294
2032
}
1295
1296
if(interface[0] == '\0'){
1297
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1299
alphasort);
1300
if(ret >= 1){
1301
/* Pick the first good interface */
1302
interface = strdup(direntries[0]->d_name);
1303
if(debug){
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1305
}
1306
if(interface == NULL){
1307
perror("malloc");
1308
free(direntries);
1309
exitcode = EXIT_FAILURE;
1310
goto end;
1311
}
1312
free(direntries);
1313
} else {
1314
free(direntries);
1315
fprintf(stderr, "Could not find a network interface\n");
1316
exitcode = EXIT_FAILURE;
1317
goto end;
1318
}
1319
}
1320
2033
1321
2034
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1322
2035
from the signal handler */
1324
2037
srand((unsigned int) time(NULL));
1325
2038
mc.simple_poll = avahi_simple_poll_new();
1326
2039
if(mc.simple_poll == NULL){
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2040
fprintf_plus(stderr,
2041
"Avahi: Failed to create simple poll object.\n");
1328
2042
exitcode = EX_UNAVAILABLE;
1329
2043
goto end;
1330
2044
}
1332
2046
sigemptyset(&sigterm_action.sa_mask);
1333
2047
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1334
2048
if(ret == -1){
1335
perror("sigaddset");
2049
perror_plus("sigaddset");
1336
2050
exitcode = EX_OSERR;
1337
2051
goto end;
1338
2052
}
1339
2053
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1340
2054
if(ret == -1){
1341
perror("sigaddset");
2055
perror_plus("sigaddset");
1342
2056
exitcode = EX_OSERR;
1343
2057
goto end;
1344
2058
}
1345
2059
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1346
2060
if(ret == -1){
1347
perror("sigaddset");
2061
perror_plus("sigaddset");
1348
2062
exitcode = EX_OSERR;
1349
2063
goto end;
1350
2064
}
1354
2068
*/
1355
2069
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1356
2070
if(ret == -1){
1357
perror("sigaction");
2071
perror_plus("sigaction");
1358
2072
return EX_OSERR;
1359
2073
}
1360
2074
if(old_sigterm_action.sa_handler != SIG_IGN){
1361
2075
ret = sigaction(SIGINT, &sigterm_action, NULL);
1362
2076
if(ret == -1){
1363
perror("sigaction");
2077
perror_plus("sigaction");
1364
2078
exitcode = EX_OSERR;
1365
2079
goto end;
1366
2080
}
1367
2081
}
1368
2082
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1369
2083
if(ret == -1){
1370
perror("sigaction");
2084
perror_plus("sigaction");
1371
2085
return EX_OSERR;
1372
2086
}
1373
2087
if(old_sigterm_action.sa_handler != SIG_IGN){
1374
2088
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1375
2089
if(ret == -1){
1376
perror("sigaction");
2090
perror_plus("sigaction");
1377
2091
exitcode = EX_OSERR;
1378
2092
goto end;
1379
2093
}
1380
2094
}
1381
2095
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1382
2096
if(ret == -1){
1383
perror("sigaction");
2097
perror_plus("sigaction");
1384
2098
return EX_OSERR;
1385
2099
}
1386
2100
if(old_sigterm_action.sa_handler != SIG_IGN){
1387
2101
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1388
2102
if(ret == -1){
1389
perror("sigaction");
2103
perror_plus("sigaction");
1390
2104
exitcode = EX_OSERR;
1391
2105
goto end;
1392
2106
}
1393
2107
}
1394
2108
1395
/* If the interface is down, bring it up */
1396
if(strcmp(interface, "none") != 0){
1397
if_index = (AvahiIfIndex) if_nametoindex(interface);
1398
if(if_index == 0){
1399
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1400
exitcode = EX_UNAVAILABLE;
1401
goto end;
1402
}
1403
1404
if(quit_now){
1405
goto end;
1406
}
1407
1408
/* Re-raise priviliges */
1409
errno = 0;
1410
ret = seteuid(0);
1411
if(ret == -1){
1412
perror("seteuid");
1413
}
1414
1415
#ifdef __linux__
1416
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1417
messages about the network interface to mess up the prompt */
1418
ret = klogctl(8, NULL, 5);
1419
bool restore_loglevel = true;
1420
if(ret == -1){
1421
restore_loglevel = false;
1422
perror("klogctl");
1423
}
1424
#endif /* __linux__ */
1425
1426
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1427
if(sd < 0){
1428
perror("socket");
1429
exitcode = EX_OSERR;
1430
#ifdef __linux__
1431
if(restore_loglevel){
1432
ret = klogctl(7, NULL, 0);
1433
if(ret == -1){
1434
perror("klogctl");
1435
}
1436
}
1437
#endif /* __linux__ */
1438
/* Lower privileges */
1439
errno = 0;
1440
ret = seteuid(uid);
1441
if(ret == -1){
1442
perror("seteuid");
1443
}
1444
goto end;
1445
}
1446
strcpy(network.ifr_name, interface);
1447
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1448
if(ret == -1){
1449
perror("ioctl SIOCGIFFLAGS");
1450
#ifdef __linux__
1451
if(restore_loglevel){
1452
ret = klogctl(7, NULL, 0);
1453
if(ret == -1){
1454
perror("klogctl");
1455
}
1456
}
1457
#endif /* __linux__ */
1458
exitcode = EX_OSERR;
1459
/* Lower privileges */
1460
errno = 0;
1461
ret = seteuid(uid);
1462
if(ret == -1){
1463
perror("seteuid");
1464
}
1465
goto end;
1466
}
1467
if((network.ifr_flags & IFF_UP) == 0){
1468
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1471
if(ret == -1){
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
1475
#ifdef __linux__
1476
if(restore_loglevel){
1477
ret = klogctl(7, NULL, 0);
1478
if(ret == -1){
1479
perror("klogctl");
1480
}
1481
}
1482
#endif /* __linux__ */
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1489
goto end;
1490
}
1491
}
1492
/* sleep checking until interface is running */
1493
for(int i=0; i < delay * 4; i++){
1494
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1495
if(ret == -1){
1496
perror("ioctl SIOCGIFFLAGS");
1497
} else if(network.ifr_flags & IFF_RUNNING){
1498
break;
1499
}
1500
struct timespec sleeptime = { .tv_nsec = 250000000 };
1501
ret = nanosleep(&sleeptime, NULL);
1502
if(ret == -1 and errno != EINTR){
1503
perror("nanosleep");
1504
}
1505
}
1506
if(not take_down_interface){
1507
/* We won't need the socket anymore */
1508
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1509
if(ret == -1){
1510
perror("close");
1511
}
1512
}
1513
#ifdef __linux__
1514
if(restore_loglevel){
1515
/* Restores kernel loglevel to default */
1516
ret = klogctl(7, NULL, 0);
1517
if(ret == -1){
1518
perror("klogctl");
1519
}
1520
}
1521
#endif /* __linux__ */
1522
/* Lower privileges */
1523
errno = 0;
1524
if(take_down_interface){
1525
/* Lower privileges */
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
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);
1530
2130
} else {
1531
/* Lower privileges permanently */
1532
ret = setuid(uid);
1533
if(ret == -1){
1534
perror("setuid");
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
}
1535
2164
}
1536
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
}
1537
2172
}
1538
2173
1539
2174
if(quit_now){
1542
2177
1543
2178
ret = init_gnutls_global(pubkey, seckey);
1544
2179
if(ret == -1){
1545
fprintf(stderr, "init_gnutls_global failed\n");
2180
fprintf_plus(stderr, "init_gnutls_global failed\n");
1546
2181
exitcode = EX_UNAVAILABLE;
1547
2182
goto end;
1548
2183
} else {
1553
2188
goto end;
1554
2189
}
1555
2190
2191
if(mkdtemp(tempdir) == NULL){
2192
perror_plus("mkdtemp");
2193
goto end;
2194
}
1556
2195
tempdir_created = true;
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1559
perror("mkdtemp");
1560
goto end;
1561
}
1562
2196
1563
2197
if(quit_now){
1564
2198
goto end;
1565
2199
}
1566
2200
1567
2201
if(not init_gpgme(pubkey, seckey, tempdir)){
1568
fprintf(stderr, "init_gpgme failed\n");
2202
fprintf_plus(stderr, "init_gpgme failed\n");
1569
2203
exitcode = EX_UNAVAILABLE;
1570
2204
goto end;
1571
2205
} else {
1580
2214
/* Connect directly, do not use Zeroconf */
1581
2215
/* (Mainly meant for debugging) */
1582
2216
char *address = strrchr(connect_to, ':');
2217
1583
2218
if(address == NULL){
1584
fprintf(stderr, "No colon in address\n");
2219
fprintf_plus(stderr, "No colon in address\n");
1585
2220
exitcode = EX_USAGE;
1586
2221
goto end;
1587
2222
}
1590
2225
goto end;
1591
2226
}
1592
2227
1593
uint16_t port;
2228
in_port_t port;
1594
2229
errno = 0;
1595
2230
tmpmax = strtoimax(address+1, &tmp, 10);
1596
2231
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1597
or tmpmax != (uint16_t)tmpmax){
1598
fprintf(stderr, "Bad port number\n");
2232
or tmpmax != (in_port_t)tmpmax){
2233
fprintf_plus(stderr, "Bad port number\n");
1599
2234
exitcode = EX_USAGE;
1600
2235
goto end;
1601
2236
}
1604
2239
goto end;
1605
2240
}
1606
2241
1607
port = (uint16_t)tmpmax;
2242
port = (in_port_t)tmpmax;
1608
2243
*address = '\0';
1609
address = connect_to;
1610
2244
/* Colon in address indicates IPv6 */
1611
2245
int af;
1612
if(strchr(address, ':') != NULL){
2246
if(strchr(connect_to, ':') != NULL){
1613
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
}
1614
2254
} else {
1615
2255
af = AF_INET;
1616
2256
}
2257
address = connect_to;
1617
2258
1618
2259
if(quit_now){
1619
2260
goto end;
1620
2261
}
1621
2262
1622
ret = start_mandos_communication(address, port, if_index, af);
1623
if(ret < 0){
1624
switch(errno){
1625
case ENETUNREACH:
1626
case EHOSTDOWN:
1627
case EHOSTUNREACH:
1628
exitcode = EX_NOHOST;
1629
break;
1630
case EINVAL:
1631
exitcode = EX_USAGE;
1632
break;
1633
case EIO:
1634
exitcode = EX_IOERR;
1635
break;
1636
case EPROTO:
1637
exitcode = EX_PROTOCOL;
1638
break;
1639
default:
1640
exitcode = EX_OSERR;
1641
break;
1642
}
1643
} else {
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){
1644
2276
exitcode = EXIT_SUCCESS;
1645
2277
}
2278
1646
2279
goto end;
1647
2280
}
1648
2281
1662
2295
/* Allocate a new server */
1663
2296
mc.server = avahi_server_new(avahi_simple_poll_get
1664
2297
(mc.simple_poll), &config, NULL,
1665
NULL, &error);
2298
NULL, &ret_errno);
1666
2299
1667
2300
/* Free the Avahi configuration data */
1668
2301
avahi_server_config_free(&config);
1670
2303
1671
2304
/* Check if creating the Avahi server object succeeded */
1672
2305
if(mc.server == NULL){
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
2306
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2307
avahi_strerror(ret_errno));
1675
2308
exitcode = EX_UNAVAILABLE;
1676
2309
goto end;
1677
2310
}
1685
2318
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1686
2319
NULL, 0, browse_callback, NULL);
1687
2320
if(sb == NULL){
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
2321
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
avahi_strerror(avahi_server_errno(mc.server)));
1690
2323
exitcode = EX_UNAVAILABLE;
1691
2324
goto end;
1692
2325
}
1698
2331
/* Run the main loop */
1699
2332
1700
2333
if(debug){
1701
fprintf(stderr, "Starting Avahi loop search\n");
1702
}
1703
1704
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
}
1705
2343
1706
2344
end:
1707
2345
1708
2346
if(debug){
1709
fprintf(stderr, "%s exiting\n", argv[0]);
2347
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1710
2348
}
1711
2349
1712
2350
/* Cleanup things */
1729
2367
gpgme_release(mc.ctx);
1730
2368
}
1731
2369
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1735
errno = 0;
1736
ret = seteuid(0);
1737
if(ret == -1){
1738
perror("seteuid");
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;
1739
2378
}
1740
if(geteuid() == 0){
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
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");
1749
2398
}
1750
2399
}
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
1760
2403
}
1761
2404
}
2405
2406
lower_privileges_permanently();
1762
2407
}
1763
2408
1764
/* Removes the temp directory used by GPGME */
2409
free(interfaces_to_take_down);
2410
free(interfaces_hooks);
2411
2412
/* Removes the GPGME temp directory and all files inside */
1765
2413
if(tempdir_created){
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1771
perror("opendir");
1772
}
1773
} else {
1774
while(true){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1777
break;
1778
}
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1784
continue;
1785
}
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];
1786
2421
char *fullname = NULL;
1787
2422
ret = asprintf(&fullname, "%s/%s", tempdir,
1788
2423
direntry->d_name);
1789
2424
if(ret < 0){
1790
perror("asprintf");
2425
perror_plus("asprintf");
1791
2426
continue;
1792
2427
}
1793
2428
ret = remove(fullname);
1794
2429
if(ret == -1){
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
1797
2432
}
1798
2433
free(fullname);
1799
2434
}
1800
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");
1801
2441
}
1802
2442
ret = rmdir(tempdir);
1803
2443
if(ret == -1 and errno != ENOENT){
1804
perror("rmdir");
2444
perror_plus("rmdir");
1805
2445
}
1806
2446
}
1807
2447
1812
2452
&old_sigterm_action,
1813
2453
NULL));
1814
2454
if(ret == -1){
1815
perror("sigaction");
2455
perror_plus("sigaction");
1816
2456
}
1817
2457
do {
1818
2458
ret = raise(signal_received);
1819
2459
} while(ret != 0 and errno == EINTR);
1820
2460
if(ret != 0){
1821
perror("raise");
2461
perror_plus("raise");
1822
2462
abort();
1823
2463
}
1824
2464
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0