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- Committer: Björn Påhlsson
- Date: 2011-11-14 19:10:50 UTC
- mto: (505.3.9 client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: belorn@fukt.bsnet.se-20111114191050-g11po6084bl9j5kf
replace calls to fprintf with fprintf_plus.
- files removed:
- bugs.xml
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
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11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
57
55
opendir(), DIR */
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
87
80
argp_state, struct argp,
94
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
89
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
90
105
91
#ifdef __linux__
106
92
#include <sys/klog.h> /* klogctl() */
148
134
static const char sys_class_net[] = "/sys/class/net";
149
135
char *connect_to = NULL;
150
136
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
137
155
138
/* Doubly linked list that need to be circularly linked when used */
156
139
typedef struct server{
157
140
const char *ip;
158
in_port_t port;
141
uint16_t port;
159
142
AvahiIfIndex if_index;
160
143
int af;
161
144
struct timespec last_seen;
165
148
166
149
/* Used for passing in values through the Avahi callback functions */
167
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
168
152
AvahiServer *server;
169
153
gnutls_certificate_credentials_t cred;
170
154
unsigned int dh_bits;
172
156
const char *priority;
173
157
gpgme_ctx_t ctx;
174
158
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
159
} mandos_context;
178
160
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
181
166
182
167
sig_atomic_t quit_now = 0;
183
168
int signal_received = 0;
184
169
185
170
/* Function to use when printing errors */
186
171
void perror_plus(const char *print_text){
187
int e = errno;
188
172
fprintf(stderr, "Mandos plugin %s: ",
189
173
program_invocation_short_name);
190
errno = e;
191
174
perror(print_text);
192
175
}
193
176
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
177
int fprintf_plus(FILE *stream, const char *format, ...){
196
178
va_list ap;
197
179
va_start (ap, format);
198
180
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
183
}
203
184
204
185
/*
206
187
* bytes. "buffer_capacity" is how much is currently allocated,
207
188
* "buffer_length" is how much is already used.
208
189
*/
209
__attribute__((nonnull, warn_unused_result))
210
190
size_t incbuffer(char **buffer, size_t buffer_length,
211
191
size_t buffer_capacity){
212
192
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
if(buffer == NULL){
219
195
return 0;
220
196
}
221
*buffer = new_buf;
222
197
buffer_capacity += BUFFER_SIZE;
223
198
}
224
199
return buffer_capacity;
225
200
}
226
201
227
202
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
231
205
int ret;
232
206
server *new_server = malloc(sizeof(server));
233
207
if(new_server == NULL){
234
208
perror_plus("malloc");
235
return false;
209
return -1;
236
210
}
237
211
*new_server = (server){ .ip = strdup(ip),
238
212
.port = port,
240
214
.af = af };
241
215
if(new_server->ip == NULL){
242
216
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
217
return -1;
259
218
}
260
219
/* Special case of first server */
261
if(*current_server == NULL){
220
if (mc.current_server == NULL){
262
221
new_server->next = new_server;
263
222
new_server->prev = new_server;
264
*current_server = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
265
225
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
269
228
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
273
237
}
274
238
275
239
/*
276
240
* Initialize GPGME.
277
241
*/
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
283
244
gpgme_error_t rc;
284
245
gpgme_engine_info_t engine_info;
285
246
247
286
248
/*
287
249
* Helper function to insert pub and seckey to the engine keyring.
288
250
*/
289
bool import_key(const char * const filename){
251
bool import_key(const char *filename){
290
252
int ret;
291
253
int fd;
292
254
gpgme_data_t pgp_data;
300
262
rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
263
if(rc != GPG_ERR_NO_ERROR){
302
264
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
265
gpgme_strsource(rc), gpgme_strerror(rc));
304
266
return false;
305
267
}
306
268
307
rc = gpgme_op_import(mc->ctx, pgp_data);
269
rc = gpgme_op_import(mc.ctx, pgp_data);
308
270
if(rc != GPG_ERR_NO_ERROR){
309
271
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
272
gpgme_strsource(rc), gpgme_strerror(rc));
311
273
return false;
312
274
}
313
275
314
ret = close(fd);
276
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
277
if(ret == -1){
316
278
perror_plus("close");
317
279
}
328
290
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
329
291
if(rc != GPG_ERR_NO_ERROR){
330
292
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
331
gpgme_strsource(rc), gpgme_strerror(rc));
293
gpgme_strsource(rc), gpgme_strerror(rc));
332
294
return false;
333
295
}
334
296
336
298
rc = gpgme_get_engine_info(&engine_info);
337
299
if(rc != GPG_ERR_NO_ERROR){
338
300
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
301
gpgme_strsource(rc), gpgme_strerror(rc));
340
302
return false;
341
303
}
342
304
while(engine_info != NULL){
348
310
engine_info = engine_info->next;
349
311
}
350
312
if(engine_info == NULL){
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
352
tempdir);
313
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n", tempdir);
353
314
return false;
354
315
}
355
316
356
317
/* Create new GPGME "context" */
357
rc = gpgme_new(&(mc->ctx));
318
rc = gpgme_new(&(mc.ctx));
358
319
if(rc != GPG_ERR_NO_ERROR){
359
320
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
361
gpgme_strerror(rc));
321
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
322
gpgme_strerror(rc));
362
323
return false;
363
324
}
364
325
373
334
* Decrypt OpenPGP data.
374
335
* Returns -1 on error
375
336
*/
376
__attribute__((nonnull, warn_unused_result))
377
337
static ssize_t pgp_packet_decrypt(const char *cryptotext,
378
338
size_t crypto_size,
379
char **plaintext,
380
mandos_context *mc){
339
char **plaintext){
381
340
gpgme_data_t dh_crypto, dh_plain;
382
341
gpgme_error_t rc;
383
342
ssize_t ret;
393
352
0);
394
353
if(rc != GPG_ERR_NO_ERROR){
395
354
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
355
gpgme_strsource(rc), gpgme_strerror(rc));
397
356
return -1;
398
357
}
399
358
401
360
rc = gpgme_data_new(&dh_plain);
402
361
if(rc != GPG_ERR_NO_ERROR){
403
362
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
406
365
gpgme_data_release(dh_crypto);
407
366
return -1;
408
367
}
409
368
410
369
/* Decrypt data from the cryptotext data buffer to the plaintext
411
370
data buffer */
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
413
372
if(rc != GPG_ERR_NO_ERROR){
414
373
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
374
gpgme_strsource(rc), gpgme_strerror(rc));
416
375
plaintext_length = -1;
417
376
if(debug){
418
377
gpgme_decrypt_result_t result;
419
result = gpgme_op_decrypt_result(mc->ctx);
378
result = gpgme_op_decrypt_result(mc.ctx);
420
379
if(result == NULL){
421
380
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
422
381
} else {
423
382
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
424
result->unsupported_algorithm);
383
result->unsupported_algorithm);
425
384
fprintf_plus(stderr, "Wrong key usage: %u\n",
426
result->wrong_key_usage);
385
result->wrong_key_usage);
427
386
if(result->file_name != NULL){
428
387
fprintf_plus(stderr, "File name: %s\n", result->file_name);
429
388
}
431
390
recipient = result->recipients;
432
391
while(recipient != NULL){
433
392
fprintf_plus(stderr, "Public key algorithm: %s\n",
434
gpgme_pubkey_algo_name
435
(recipient->pubkey_algo));
393
gpgme_pubkey_algo_name(recipient->pubkey_algo));
436
394
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
437
395
fprintf_plus(stderr, "Secret key available: %s\n",
438
recipient->status == GPG_ERR_NO_SECKEY
439
? "No" : "Yes");
396
recipient->status == GPG_ERR_NO_SECKEY
397
? "No" : "Yes");
440
398
recipient = recipient->next;
441
399
}
442
400
}
499
457
return plaintext_length;
500
458
}
501
459
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
__attribute__((warn_unused_result))
510
static const char *safer_gnutls_strerror(int value){
511
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
460
static const char * safer_gnutls_strerror(int value){
461
const char *ret = gnutls_strerror(value); /* Spurious warning from
462
-Wunreachable-code */
463
if(ret == NULL)
464
ret = "(unknown)";
465
return ret;
513
466
}
514
467
515
468
/* GnuTLS log function callback */
516
__attribute__((nonnull))
517
469
static void debuggnutls(__attribute__((unused)) int level,
518
470
const char* string){
519
471
fprintf_plus(stderr, "GnuTLS: %s", string);
520
472
}
521
473
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
523
474
static int init_gnutls_global(const char *pubkeyfilename,
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
475
const char *seckeyfilename){
527
476
int ret;
528
unsigned int uret;
529
477
530
478
if(debug){
531
479
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
480
}
533
481
482
ret = gnutls_global_init();
483
if(ret != GNUTLS_E_SUCCESS){
484
fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
485
return -1;
486
}
487
534
488
if(debug){
535
489
/* "Use a log level over 10 to enable all debugging options."
536
490
* - GnuTLS manual
540
494
}
541
495
542
496
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
497
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
498
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
499
fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
500
gnutls_global_deinit();
547
501
return -1;
548
502
}
549
503
550
504
if(debug){
551
505
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
552
" secret key %s as GnuTLS credentials\n",
553
pubkeyfilename,
554
seckeyfilename);
506
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
507
seckeyfilename);
555
508
}
556
509
557
510
ret = gnutls_certificate_set_openpgp_key_file
558
(mc->cred, pubkeyfilename, seckeyfilename,
511
(mc.cred, pubkeyfilename, seckeyfilename,
559
512
GNUTLS_OPENPGP_FMT_BASE64);
560
513
if(ret != GNUTLS_E_SUCCESS){
561
514
fprintf_plus(stderr,
562
515
"Error[%d] while reading the OpenPGP key pair ('%s',"
563
516
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
564
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
565
safer_gnutls_strerror(ret));
517
fprintf_plus(stderr, "The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
566
518
goto globalfail;
567
519
}
568
520
569
521
/* GnuTLS server initialization */
570
ret = gnutls_dh_params_init(&mc->dh_params);
571
if(ret != GNUTLS_E_SUCCESS){
572
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
" initialization: %s\n",
574
safer_gnutls_strerror(ret));
575
goto globalfail;
576
}
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
close(dhpfile);
617
if(params.data == NULL){
618
dhparamsfilename = NULL;
619
}
620
if(dhparamsfilename == NULL){
621
break;
622
}
623
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
624
GNUTLS_X509_FMT_PEM);
625
if(ret != GNUTLS_E_SUCCESS){
626
fprintf_plus(stderr, "Failed to parse DH parameters in file"
627
" \"%s\": %s\n", dhparamsfilename,
628
safer_gnutls_strerror(ret));
629
dhparamsfilename = NULL;
630
}
631
free(params.data);
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
522
ret = gnutls_dh_params_init(&mc.dh_params);
523
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr, "Error in GnuTLS DH parameter initialization:"
525
" %s\n", safer_gnutls_strerror(ret));
526
goto globalfail;
527
}
528
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
531
safer_gnutls_strerror(ret));
532
goto globalfail;
533
}
534
535
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
752
536
753
537
return 0;
754
538
755
539
globalfail:
756
540
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_dh_params_deinit(mc->dh_params);
541
gnutls_certificate_free_credentials(mc.cred);
542
gnutls_global_deinit();
543
gnutls_dh_params_deinit(mc.dh_params);
759
544
return -1;
760
545
}
761
546
762
__attribute__((nonnull, warn_unused_result))
763
static int init_gnutls_session(gnutls_session_t *session,
764
mandos_context *mc){
547
static int init_gnutls_session(gnutls_session_t *session){
765
548
int ret;
766
549
/* GnuTLS session creation */
767
550
do {
771
554
}
772
555
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
773
556
if(ret != GNUTLS_E_SUCCESS){
774
fprintf_plus(stderr,
775
"Error in GnuTLS session initialization: %s\n",
776
safer_gnutls_strerror(ret));
557
fprintf_plus(stderr, "Error in GnuTLS session initialization: %s\n",
558
safer_gnutls_strerror(ret));
777
559
}
778
560
779
561
{
780
562
const char *err;
781
563
do {
782
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
564
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
565
if(quit_now){
784
566
gnutls_deinit(*session);
785
567
return -1;
787
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
788
570
if(ret != GNUTLS_E_SUCCESS){
789
571
fprintf_plus(stderr, "Syntax error at: %s\n", err);
790
fprintf_plus(stderr, "GnuTLS error: %s\n",
791
safer_gnutls_strerror(ret));
572
fprintf_plus(stderr, "GnuTLS error: %s\n", safer_gnutls_strerror(ret));
792
573
gnutls_deinit(*session);
793
574
return -1;
794
575
}
796
577
797
578
do {
798
579
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
799
mc->cred);
580
mc.cred);
800
581
if(quit_now){
801
582
gnutls_deinit(*session);
802
583
return -1;
804
585
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
805
586
if(ret != GNUTLS_E_SUCCESS){
806
587
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
807
safer_gnutls_strerror(ret));
588
safer_gnutls_strerror(ret));
808
589
gnutls_deinit(*session);
809
590
return -1;
810
591
}
812
593
/* ignore client certificate if any. */
813
594
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
814
595
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
597
815
598
return 0;
816
599
}
817
600
819
602
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
820
603
__attribute__((unused)) const char *txt){}
821
604
822
/* Set effective uid to 0, return errno */
823
__attribute__((warn_unused_result))
824
int raise_privileges(void){
825
int old_errno = errno;
826
int ret = 0;
827
if(seteuid(0) == -1){
828
ret = errno;
829
}
830
errno = old_errno;
831
return ret;
832
}
833
834
/* Set effective and real user ID to 0. Return errno. */
835
__attribute__((warn_unused_result))
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
839
if(ret != 0){
840
errno = old_errno;
841
return ret;
842
}
843
if(setuid(0) == -1){
844
ret = errno;
845
}
846
errno = old_errno;
847
return ret;
848
}
849
850
/* Set effective user ID to unprivileged saved user ID */
851
__attribute__((warn_unused_result))
852
int lower_privileges(void){
853
int old_errno = errno;
854
int ret = 0;
855
if(seteuid(uid) == -1){
856
ret = errno;
857
}
858
errno = old_errno;
859
return ret;
860
}
861
862
/* Lower privileges permanently */
863
__attribute__((warn_unused_result))
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
866
int ret = 0;
867
if(setuid(uid) == -1){
868
ret = errno;
869
}
870
errno = old_errno;
871
return ret;
872
}
873
874
/* Helper function to add_local_route() and delete_local_route() */
875
__attribute__((nonnull, warn_unused_result))
876
static bool add_delete_local_route(const bool add,
877
const char *address,
878
AvahiIfIndex if_index){
879
int ret;
880
char helper[] = "mandos-client-iprouteadddel";
881
char add_arg[] = "add";
882
char delete_arg[] = "delete";
883
char debug_flag[] = "--debug";
884
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
885
if(pluginhelperdir == NULL){
886
if(debug){
887
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
888
" variable not set; cannot run helper\n");
889
}
890
return false;
891
}
892
893
char interface[IF_NAMESIZE];
894
if(if_indextoname((unsigned int)if_index, interface) == NULL){
895
perror_plus("if_indextoname");
896
return false;
897
}
898
899
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
900
if(devnull == -1){
901
perror_plus("open(\"/dev/null\", O_RDONLY)");
902
return false;
903
}
904
pid_t pid = fork();
905
if(pid == 0){
906
/* Child */
907
/* Raise privileges */
908
errno = raise_privileges_permanently();
909
if(errno != 0){
910
perror_plus("Failed to raise privileges");
911
/* _exit(EX_NOPERM); */
912
} else {
913
/* Set group */
914
errno = 0;
915
ret = setgid(0);
916
if(ret == -1){
917
perror_plus("setgid");
918
_exit(EX_NOPERM);
919
}
920
/* Reset supplementary groups */
921
errno = 0;
922
ret = setgroups(0, NULL);
923
if(ret == -1){
924
perror_plus("setgroups");
925
_exit(EX_NOPERM);
926
}
927
}
928
ret = dup2(devnull, STDIN_FILENO);
929
if(ret == -1){
930
perror_plus("dup2(devnull, STDIN_FILENO)");
931
_exit(EX_OSERR);
932
}
933
ret = close(devnull);
934
if(ret == -1){
935
perror_plus("close");
936
_exit(EX_OSERR);
937
}
938
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
939
if(ret == -1){
940
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
941
_exit(EX_OSERR);
942
}
943
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
O_RDONLY
945
| O_DIRECTORY
946
| O_PATH
947
| O_CLOEXEC));
948
if(helperdir_fd == -1){
949
perror_plus("open");
950
_exit(EX_UNAVAILABLE);
951
}
952
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
953
helper, O_RDONLY));
954
if(helper_fd == -1){
955
perror_plus("openat");
956
close(helperdir_fd);
957
_exit(EX_UNAVAILABLE);
958
}
959
close(helperdir_fd);
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
1040
605
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
606
static int start_mandos_communication(const char *ip, uint16_t port,
1043
607
AvahiIfIndex if_index,
1044
int af, mandos_context *mc){
608
int af){
1045
609
int ret, tcp_sd = -1;
1046
610
ssize_t sret;
1047
struct sockaddr_storage to;
611
union {
612
struct sockaddr_in in;
613
struct sockaddr_in6 in6;
614
} to;
1048
615
char *buffer = NULL;
1049
616
char *decrypted_buffer = NULL;
1050
617
size_t buffer_length = 0;
1053
620
int retval = -1;
1054
621
gnutls_session_t session;
1055
622
int pf; /* Protocol family */
1056
bool route_added = false;
1057
623
1058
624
errno = 0;
1059
625
1075
641
return -1;
1076
642
}
1077
643
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
1107
return -1;
1108
}
1109
}
1110
1111
ret = init_gnutls_session(&session, mc);
644
ret = init_gnutls_session(&session);
1112
645
if(ret != 0){
1113
646
return -1;
1114
647
}
1115
648
1116
649
if(debug){
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
650
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
"\n", ip, port);
1119
652
}
1120
653
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
654
tcp_sd = socket(pf, SOCK_STREAM, 0);
1122
655
if(tcp_sd < 0){
1123
656
int e = errno;
1124
657
perror_plus("socket");
1131
664
goto mandos_end;
1132
665
}
1133
666
667
memset(&to, 0, sizeof(to));
1134
668
if(af == AF_INET6){
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
669
to.in6.sin6_family = (sa_family_t)af;
670
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
671
} else { /* IPv4 */
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
672
to.in.sin_family = (sa_family_t)af;
673
ret = inet_pton(af, ip, &to.in.sin_addr);
1142
674
}
1143
675
if(ret < 0 ){
1144
676
int e = errno;
1153
685
goto mandos_end;
1154
686
}
1155
687
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
1159
695
if(if_index == AVAHI_IF_UNSPEC){
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
" incomplete without a network interface\n");
696
fprintf_plus(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
1162
698
errno = EINVAL;
1163
699
goto mandos_end;
1164
700
}
1165
701
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
702
to.in6.sin6_scope_id = (uint32_t)if_index;
1167
703
}
1168
704
} else {
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
1170
708
}
1171
709
1172
710
if(quit_now){
1180
718
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1181
719
perror_plus("if_indextoname");
1182
720
} else {
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
721
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
1185
723
}
1186
724
} else {
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
725
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n", ip, port);
1189
726
}
1190
727
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
728
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
729
const char *pcret;
730
if(af == AF_INET6){
731
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
732
sizeof(addrstr));
733
} else {
734
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
735
sizeof(addrstr));
736
}
737
if(pcret == NULL){
738
perror_plus("inet_ntop");
739
} else {
740
if(strcmp(addrstr, ip) != 0){
741
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
742
}
743
}
744
}
745
746
if(quit_now){
747
errno = EINTR;
748
goto mandos_end;
749
}
750
751
if(af == AF_INET6){
752
ret = connect(tcp_sd, &to.in6, sizeof(to));
753
} else {
754
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
755
}
756
if(ret < 0){
757
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
758
int e = errno;
759
perror_plus("connect");
760
errno = e;
761
}
762
goto mandos_end;
763
}
764
765
if(quit_now){
766
errno = EINTR;
767
goto mandos_end;
1272
768
}
1273
769
1274
770
const char *out = mandos_protocol_version;
1310
806
goto mandos_end;
1311
807
}
1312
808
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
809
/* Spurious warning from -Wint-to-pointer-cast */
810
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1318
811
1319
812
if(quit_now){
1320
813
errno = EINTR;
1341
834
/* Read OpenPGP packet that contains the wanted password */
1342
835
1343
836
if(debug){
1344
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1345
" %s\n", ip);
837
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);
1346
838
}
1347
839
1348
840
while(true){
1386
878
}
1387
879
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1388
880
if(ret < 0){
1389
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1390
"***\n");
881
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed ***\n");
1391
882
gnutls_perror(ret);
1392
883
errno = EPROTO;
1393
884
goto mandos_end;
1395
886
break;
1396
887
default:
1397
888
fprintf_plus(stderr, "Unknown error while reading data from"
1398
" encrypted session with Mandos server\n");
889
" encrypted session with Mandos server\n");
1399
890
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1400
891
errno = EIO;
1401
892
goto mandos_end;
1425
916
if(buffer_length > 0){
1426
917
ssize_t decrypted_buffer_size;
1427
918
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
919
&decrypted_buffer);
1429
920
if(decrypted_buffer_size >= 0){
1430
921
1431
clearerr(stdout);
1432
922
written = 0;
1433
923
while(written < (size_t) decrypted_buffer_size){
1434
924
if(quit_now){
1443
933
int e = errno;
1444
934
if(debug){
1445
935
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1446
strerror(errno));
936
strerror(errno));
1447
937
}
1448
938
errno = e;
1449
939
goto mandos_end;
1450
940
}
1451
941
written += (size_t)ret;
1452
942
}
1453
ret = fflush(stdout);
1454
if(ret != 0){
1455
int e = errno;
1456
if(debug){
1457
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1458
strerror(errno));
1459
}
1460
errno = e;
1461
goto mandos_end;
1462
}
1463
943
retval = 0;
1464
944
}
1465
945
}
1468
948
1469
949
mandos_end:
1470
950
{
1471
if(route_added){
1472
if(not delete_local_route(ip, if_index)){
1473
fprintf_plus(stderr, "Failed to delete local route to %s on"
1474
" interface %d", ip, if_index);
1475
}
1476
}
1477
951
int e = errno;
1478
952
free(decrypted_buffer);
1479
953
free(buffer);
1480
954
if(tcp_sd >= 0){
1481
ret = close(tcp_sd);
955
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1482
956
}
1483
957
if(ret == -1){
1484
958
if(e == 0){
1509
983
AVAHI_GCC_UNUSED AvahiStringList *txt,
1510
984
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1511
985
flags,
1512
void *mc){
1513
if(r == NULL){
1514
return;
1515
}
986
AVAHI_GCC_UNUSED void* userdata){
987
assert(r);
1516
988
1517
989
/* Called whenever a service has been resolved successfully or
1518
990
timed out */
1519
991
1520
992
if(quit_now){
1521
avahi_s_service_resolver_free(r);
1522
993
return;
1523
994
}
1524
995
1525
996
switch(event){
1526
997
default:
1527
998
case AVAHI_RESOLVER_FAILURE:
1528
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1529
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1530
domain,
1531
avahi_strerror(avahi_server_errno
1532
(((mandos_context*)mc)->server)));
999
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1000
" of type '%s' in domain '%s': %s\n", name, type, domain,
1001
avahi_strerror(avahi_server_errno(mc.server)));
1533
1002
break;
1534
1003
1535
1004
case AVAHI_RESOLVER_FOUND:
1538
1007
avahi_address_snprint(ip, sizeof(ip), address);
1539
1008
if(debug){
1540
1009
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1541
PRIdMAX ") on port %" PRIu16 "\n", name,
1542
host_name, ip, (intmax_t)interface, port);
1010
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1011
ip, (intmax_t)interface, port);
1543
1012
}
1544
int ret = start_mandos_communication(ip, (in_port_t)port,
1545
interface,
1546
avahi_proto_to_af(proto),
1547
mc);
1013
int ret = start_mandos_communication(ip, port, interface,
1014
avahi_proto_to_af(proto));
1548
1015
if(ret == 0){
1549
avahi_simple_poll_quit(simple_poll);
1016
avahi_simple_poll_quit(mc.simple_poll);
1550
1017
} else {
1551
if(not add_server(ip, (in_port_t)port, interface,
1552
avahi_proto_to_af(proto),
1553
&((mandos_context*)mc)->current_server)){
1554
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1555
" list\n", name);
1556
}
1018
ret = add_server(ip, port, interface,
1019
avahi_proto_to_af(proto));
1557
1020
}
1558
1021
}
1559
1022
}
1569
1032
const char *domain,
1570
1033
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1571
1034
flags,
1572
void *mc){
1573
if(b == NULL){
1574
return;
1575
}
1035
AVAHI_GCC_UNUSED void* userdata){
1036
assert(b);
1576
1037
1577
1038
/* Called whenever a new services becomes available on the LAN or
1578
1039
is removed from the LAN */
1586
1047
case AVAHI_BROWSER_FAILURE:
1587
1048
1588
1049
fprintf_plus(stderr, "(Avahi browser) %s\n",
1589
avahi_strerror(avahi_server_errno
1590
(((mandos_context*)mc)->server)));
1591
avahi_simple_poll_quit(simple_poll);
1050
avahi_strerror(avahi_server_errno(mc.server)));
1051
avahi_simple_poll_quit(mc.simple_poll);
1592
1052
return;
1593
1053
1594
1054
case AVAHI_BROWSER_NEW:
1597
1057
the callback function is called the Avahi server will free the
1598
1058
resolver for us. */
1599
1059
1600
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1601
interface, protocol, name, type,
1602
domain, protocol, 0,
1603
resolve_callback, mc) == NULL)
1604
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1605
" %s\n", name,
1606
avahi_strerror(avahi_server_errno
1607
(((mandos_context*)mc)->server)));
1060
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1061
name, type, domain, protocol, 0,
1062
resolve_callback, NULL) == NULL)
1063
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1064
name, avahi_strerror(avahi_server_errno(mc.server)));
1608
1065
break;
1609
1066
1610
1067
case AVAHI_BROWSER_REMOVE:
1613
1070
case AVAHI_BROWSER_ALL_FOR_NOW:
1614
1071
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1615
1072
if(debug){
1616
fprintf_plus(stderr, "No Mandos server found, still"
1617
" searching...\n");
1073
fprintf_plus(stderr, "No Mandos server found, still searching...\n");
1618
1074
}
1619
1075
break;
1620
1076
}
1629
1085
signal_received = sig;
1630
1086
int old_errno = errno;
1631
1087
/* set main loop to exit */
1632
if(simple_poll != NULL){
1633
avahi_simple_poll_quit(simple_poll);
1088
if(mc.simple_poll != NULL){
1089
avahi_simple_poll_quit(mc.simple_poll);
1634
1090
}
1635
1091
errno = old_errno;
1636
1092
}
1637
1093
1638
__attribute__((nonnull, warn_unused_result))
1639
1094
bool get_flags(const char *ifname, struct ifreq *ifr){
1640
1095
int ret;
1641
int old_errno;
1642
1096
1643
1097
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1644
1098
if(s < 0){
1645
old_errno = errno;
1646
1099
perror_plus("socket");
1647
errno = old_errno;
1648
1100
return false;
1649
1101
}
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1102
strcpy(ifr->ifr_name, ifname);
1652
1103
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1653
1104
if(ret == -1){
1654
1105
if(debug){
1655
old_errno = errno;
1656
1106
perror_plus("ioctl SIOCGIFFLAGS");
1657
errno = old_errno;
1658
1107
}
1659
close(s);
1660
1108
return false;
1661
1109
}
1662
close(s);
1663
1110
return true;
1664
1111
}
1665
1112
1666
__attribute__((nonnull, warn_unused_result))
1667
1113
bool good_flags(const char *ifname, const struct ifreq *ifr){
1668
1114
1669
1115
/* Reject the loopback device */
1670
1116
if(ifr->ifr_flags & IFF_LOOPBACK){
1671
1117
if(debug){
1672
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1673
ifname);
1118
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n", ifname);
1674
1119
}
1675
1120
return false;
1676
1121
}
1677
1122
/* Accept point-to-point devices only if connect_to is specified */
1678
1123
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1679
1124
if(debug){
1680
fprintf_plus(stderr, "Accepting point-to-point interface"
1681
" \"%s\"\n", ifname);
1125
fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);
1682
1126
}
1683
1127
return true;
1684
1128
}
1685
1129
/* Otherwise, reject non-broadcast-capable devices */
1686
1130
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1687
1131
if(debug){
1688
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1689
" \"%s\"\n", ifname);
1132
fprintf_plus(stderr, "Rejecting non-broadcast interface \"%s\"\n", ifname);
1690
1133
}
1691
1134
return false;
1692
1135
}
1693
1136
/* Reject non-ARP interfaces (including dummy interfaces) */
1694
1137
if(ifr->ifr_flags & IFF_NOARP){
1695
1138
if(debug){
1696
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1697
ifname);
1139
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1698
1140
}
1699
1141
return false;
1700
1142
}
1711
1153
* corresponds to an acceptable network device.
1712
1154
* (This function is passed to scandir(3) as a filter function.)
1713
1155
*/
1714
__attribute__((nonnull, warn_unused_result))
1715
1156
int good_interface(const struct dirent *if_entry){
1716
1157
if(if_entry->d_name[0] == '.'){
1717
1158
return 0;
1720
1161
struct ifreq ifr;
1721
1162
if(not get_flags(if_entry->d_name, &ifr)){
1722
1163
if(debug){
1723
fprintf_plus(stderr, "Failed to get flags for interface "
1724
"\"%s\"\n", if_entry->d_name);
1725
}
1726
return 0;
1727
}
1728
1729
if(not good_flags(if_entry->d_name, &ifr)){
1730
return 0;
1731
}
1732
return 1;
1733
}
1734
1735
/*
1736
* This function determines if a network interface is up.
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
bool interface_is_up(const char *interface){
1740
struct ifreq ifr;
1741
if(not get_flags(interface, &ifr)){
1742
if(debug){
1743
fprintf_plus(stderr, "Failed to get flags for interface "
1744
"\"%s\"\n", interface);
1745
}
1746
return false;
1747
}
1748
1749
return (bool)(ifr.ifr_flags & IFF_UP);
1750
}
1751
1752
/*
1753
* This function determines if a network interface is running
1754
*/
1755
__attribute__((nonnull, warn_unused_result))
1756
bool interface_is_running(const char *interface){
1757
struct ifreq ifr;
1758
if(not get_flags(interface, &ifr)){
1759
if(debug){
1760
fprintf_plus(stderr, "Failed to get flags for interface "
1761
"\"%s\"\n", interface);
1762
}
1763
return false;
1764
}
1765
1766
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1767
}
1768
1769
__attribute__((nonnull, pure, warn_unused_result))
1164
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 0;
1168
}
1169
1170
if(not good_flags(if_entry->d_name, &ifr)){
1171
return 0;
1172
}
1173
return 1;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device which is up.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int up_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1190
if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
/* Reject down interfaces */
1196
if(not (ifr.ifr_flags & IFF_UP)){
1197
if(debug){
1198
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1199
if_entry->d_name);
1200
}
1201
return 0;
1202
}
1203
1204
/* Reject non-running interfaces */
1205
if(not (ifr.ifr_flags & IFF_RUNNING)){
1206
if(debug){
1207
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1208
if_entry->d_name);
1209
}
1210
return 0;
1211
}
1212
1213
if(not good_flags(if_entry->d_name, &ifr)){
1214
return 0;
1215
}
1216
return 1;
1217
}
1218
1770
1219
int notdotentries(const struct dirent *direntry){
1771
1220
/* Skip "." and ".." */
1772
1221
if(direntry->d_name[0] == '.'
1779
1228
}
1780
1229
1781
1230
/* Is this directory entry a runnable program? */
1782
__attribute__((nonnull, warn_unused_result))
1783
1231
int runnable_hook(const struct dirent *direntry){
1784
1232
int ret;
1785
1233
size_t sret;
1793
1241
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1794
1242
"abcdefghijklmnopqrstuvwxyz"
1795
1243
"0123456789"
1796
"_.-");
1244
"_-");
1797
1245
if((direntry->d_name)[sret] != '\0'){
1798
1246
/* Contains non-allowed characters */
1799
1247
if(debug){
1800
1248
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1801
direntry->d_name);
1249
direntry->d_name);
1802
1250
}
1803
1251
return 0;
1804
1252
}
1805
1253
1806
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1254
char *fullname = NULL;
1255
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1256
if(ret < 0){
1257
perror_plus("asprintf");
1258
return 0;
1259
}
1260
1261
ret = stat(fullname, &st);
1807
1262
if(ret == -1){
1808
1263
if(debug){
1809
1264
perror_plus("Could not stat hook");
1814
1269
/* Not a regular file */
1815
1270
if(debug){
1816
1271
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1817
direntry->d_name);
1272
direntry->d_name);
1818
1273
}
1819
1274
return 0;
1820
1275
}
1822
1277
/* Not executable */
1823
1278
if(debug){
1824
1279
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1825
direntry->d_name);
1280
direntry->d_name);
1826
1281
}
1827
1282
return 0;
1828
1283
}
1829
if(debug){
1830
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1831
direntry->d_name);
1832
}
1833
1284
return 1;
1834
1285
}
1835
1286
1836
__attribute__((nonnull, warn_unused_result))
1837
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1838
mandos_context *mc){
1287
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1839
1288
int ret;
1840
1289
struct timespec now;
1841
1290
struct timespec waited_time;
1842
1291
intmax_t block_time;
1843
1292
1844
1293
while(true){
1845
if(mc->current_server == NULL){
1846
if(debug){
1847
fprintf_plus(stderr, "Wait until first server is found."
1848
" No timeout!\n");
1294
if(mc.current_server == NULL){
1295
if (debug){
1296
fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");
1849
1297
}
1850
1298
ret = avahi_simple_poll_iterate(s, -1);
1851
1299
} else {
1852
if(debug){
1853
fprintf_plus(stderr, "Check current_server if we should run"
1854
" it, or wait\n");
1300
if (debug){
1301
fprintf_plus(stderr, "Check current_server if we should run it,"
1302
" or wait\n");
1855
1303
}
1856
1304
/* the current time */
1857
1305
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1862
1310
/* Calculating in ms how long time between now and server
1863
1311
who we visted longest time ago. Now - last seen. */
1864
1312
waited_time.tv_sec = (now.tv_sec
1865
- mc->current_server->last_seen.tv_sec);
1313
- mc.current_server->last_seen.tv_sec);
1866
1314
waited_time.tv_nsec = (now.tv_nsec
1867
- mc->current_server->last_seen.tv_nsec);
1315
- mc.current_server->last_seen.tv_nsec);
1868
1316
/* total time is 10s/10,000ms.
1869
1317
Converting to s from ms by dividing by 1,000,
1870
1318
and ns to ms by dividing by 1,000,000. */
1872
1320
- ((intmax_t)waited_time.tv_sec * 1000))
1873
1321
- ((intmax_t)waited_time.tv_nsec / 1000000));
1874
1322
1875
if(debug){
1876
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1877
block_time);
1323
if (debug){
1324
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1878
1325
}
1879
1326
1880
1327
if(block_time <= 0){
1881
ret = start_mandos_communication(mc->current_server->ip,
1882
mc->current_server->port,
1883
mc->current_server->if_index,
1884
mc->current_server->af, mc);
1328
ret = start_mandos_communication(mc.current_server->ip,
1329
mc.current_server->port,
1330
mc.current_server->if_index,
1331
mc.current_server->af);
1885
1332
if(ret == 0){
1886
avahi_simple_poll_quit(s);
1333
avahi_simple_poll_quit(mc.simple_poll);
1887
1334
return 0;
1888
1335
}
1889
1336
ret = clock_gettime(CLOCK_MONOTONIC,
1890
&mc->current_server->last_seen);
1337
&mc.current_server->last_seen);
1891
1338
if(ret == -1){
1892
1339
perror_plus("clock_gettime");
1893
1340
return -1;
1894
1341
}
1895
mc->current_server = mc->current_server->next;
1342
mc.current_server = mc.current_server->next;
1896
1343
block_time = 0; /* Call avahi to find new Mandos
1897
1344
servers, but don't block */
1898
1345
}
1900
1347
ret = avahi_simple_poll_iterate(s, (int)block_time);
1901
1348
}
1902
1349
if(ret != 0){
1903
if(ret > 0 or errno != EINTR){
1350
if (ret > 0 or errno != EINTR){
1904
1351
return (ret != 1) ? ret : 0;
1905
1352
}
1906
1353
}
1907
1354
}
1908
1355
}
1909
1356
1910
__attribute__((nonnull))
1911
void run_network_hooks(const char *mode, const char *interface,
1912
const float delay){
1913
struct dirent **direntries = NULL;
1914
if(hookdir_fd == -1){
1915
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1916
| O_CLOEXEC);
1917
if(hookdir_fd == -1){
1918
if(errno == ENOENT){
1919
if(debug){
1920
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1921
" found\n", hookdir);
1922
}
1923
} else {
1924
perror_plus("open");
1925
}
1926
return;
1927
}
1928
}
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1930
if(devnull == -1){
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1932
return;
1933
}
1934
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1935
runnable_hook, alphasort);
1936
if(numhooks == -1){
1937
perror_plus("scandir");
1938
close(devnull);
1939
return;
1940
}
1941
struct dirent *direntry;
1942
int ret;
1943
for(int i = 0; i < numhooks; i++){
1944
direntry = direntries[i];
1945
if(debug){
1946
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1947
direntry->d_name);
1948
}
1949
pid_t hook_pid = fork();
1950
if(hook_pid == 0){
1951
/* Child */
1952
/* Raise privileges */
1953
errno = raise_privileges_permanently();
1954
if(errno != 0){
1955
perror_plus("Failed to raise privileges");
1956
_exit(EX_NOPERM);
1957
}
1958
/* Set group */
1959
errno = 0;
1960
ret = setgid(0);
1961
if(ret == -1){
1962
perror_plus("setgid");
1963
_exit(EX_NOPERM);
1964
}
1965
/* Reset supplementary groups */
1966
errno = 0;
1967
ret = setgroups(0, NULL);
1968
if(ret == -1){
1969
perror_plus("setgroups");
1970
_exit(EX_NOPERM);
1971
}
1972
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("DEVICE", interface, 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
ret = setenv("MODE", mode, 1);
1988
if(ret == -1){
1989
perror_plus("setenv");
1990
_exit(EX_OSERR);
1991
}
1992
char *delaystring;
1993
ret = asprintf(&delaystring, "%f", (double)delay);
1994
if(ret == -1){
1995
perror_plus("asprintf");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("DELAY", delaystring, 1);
1999
if(ret == -1){
2000
free(delaystring);
2001
perror_plus("setenv");
2002
_exit(EX_OSERR);
2003
}
2004
free(delaystring);
2005
if(connect_to != NULL){
2006
ret = setenv("CONNECT", connect_to, 1);
2007
if(ret == -1){
2008
perror_plus("setenv");
2009
_exit(EX_OSERR);
2010
}
2011
}
2012
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2013
direntry->d_name,
2014
O_RDONLY));
2015
if(hook_fd == -1){
2016
perror_plus("openat");
2017
_exit(EXIT_FAILURE);
2018
}
2019
if(close(hookdir_fd) == -1){
2020
perror_plus("close");
2021
_exit(EXIT_FAILURE);
2022
}
2023
ret = dup2(devnull, STDIN_FILENO);
2024
if(ret == -1){
2025
perror_plus("dup2(devnull, STDIN_FILENO)");
2026
_exit(EX_OSERR);
2027
}
2028
ret = close(devnull);
2029
if(ret == -1){
2030
perror_plus("close");
2031
_exit(EX_OSERR);
2032
}
2033
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2034
if(ret == -1){
2035
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2036
_exit(EX_OSERR);
2037
}
2038
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2039
environ) == -1){
2040
perror_plus("fexecve");
2041
_exit(EXIT_FAILURE);
2042
}
2043
} else {
2044
if(hook_pid == -1){
2045
perror_plus("fork");
2046
free(direntry);
2047
continue;
2048
}
2049
int status;
2050
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2051
perror_plus("waitpid");
2052
free(direntry);
2053
continue;
2054
}
2055
if(WIFEXITED(status)){
2056
if(WEXITSTATUS(status) != 0){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2058
" with status %d\n", direntry->d_name,
2059
WEXITSTATUS(status));
2060
free(direntry);
2061
continue;
2062
}
2063
} else if(WIFSIGNALED(status)){
2064
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2065
" signal %d\n", direntry->d_name,
2066
WTERMSIG(status));
2067
free(direntry);
2068
continue;
2069
} else {
2070
fprintf_plus(stderr, "Warning: network hook \"%s\""
2071
" crashed\n", direntry->d_name);
2072
free(direntry);
2073
continue;
2074
}
2075
}
2076
if(debug){
2077
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2078
direntry->d_name);
2079
}
2080
free(direntry);
2081
}
2082
free(direntries);
2083
if(close(hookdir_fd) == -1){
2084
perror_plus("close");
2085
} else {
2086
hookdir_fd = -1;
2087
}
2088
close(devnull);
2089
}
2090
2091
__attribute__((nonnull, warn_unused_result))
2092
int bring_up_interface(const char *const interface,
2093
const float delay){
2094
int old_errno = errno;
2095
int ret;
2096
struct ifreq network;
2097
unsigned int if_index = if_nametoindex(interface);
2098
if(if_index == 0){
2099
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2100
errno = old_errno;
2101
return ENXIO;
2102
}
2103
2104
if(quit_now){
2105
errno = old_errno;
2106
return EINTR;
2107
}
2108
2109
if(not interface_is_up(interface)){
2110
int ret_errno = 0;
2111
int ioctl_errno = 0;
2112
if(not get_flags(interface, &network)){
2113
ret_errno = errno;
2114
fprintf_plus(stderr, "Failed to get flags for interface "
2115
"\"%s\"\n", interface);
2116
errno = old_errno;
2117
return ret_errno;
2118
}
2119
network.ifr_flags |= IFF_UP; /* set flag */
2120
2121
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2122
if(sd == -1){
2123
ret_errno = errno;
2124
perror_plus("socket");
2125
errno = old_errno;
2126
return ret_errno;
2127
}
2128
2129
if(quit_now){
2130
ret = close(sd);
2131
if(ret == -1){
2132
perror_plus("close");
2133
}
2134
errno = old_errno;
2135
return EINTR;
2136
}
2137
2138
if(debug){
2139
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2140
interface);
2141
}
2142
2143
/* Raise privileges */
2144
ret_errno = raise_privileges();
2145
if(ret_errno != 0){
2146
errno = ret_errno;
2147
perror_plus("Failed to raise privileges");
2148
}
2149
2150
#ifdef __linux__
2151
int ret_linux;
2152
bool restore_loglevel = false;
2153
if(ret_errno == 0){
2154
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2155
messages about the network interface to mess up the prompt */
2156
ret_linux = klogctl(8, NULL, 5);
2157
if(ret_linux == -1){
2158
perror_plus("klogctl");
2159
} else {
2160
restore_loglevel = true;
2161
}
2162
}
2163
#endif /* __linux__ */
2164
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2165
ioctl_errno = errno;
2166
#ifdef __linux__
2167
if(restore_loglevel){
2168
ret_linux = klogctl(7, NULL, 0);
2169
if(ret_linux == -1){
2170
perror_plus("klogctl");
2171
}
2172
}
2173
#endif /* __linux__ */
2174
2175
/* If raise_privileges() succeeded above */
2176
if(ret_errno == 0){
2177
/* Lower privileges */
2178
ret_errno = lower_privileges();
2179
if(ret_errno != 0){
2180
errno = ret_errno;
2181
perror_plus("Failed to lower privileges");
2182
}
2183
}
2184
2185
/* Close the socket */
2186
ret = close(sd);
2187
if(ret == -1){
2188
perror_plus("close");
2189
}
2190
2191
if(ret_setflags == -1){
2192
errno = ioctl_errno;
2193
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2194
errno = old_errno;
2195
return ioctl_errno;
2196
}
2197
} else if(debug){
2198
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2199
interface);
2200
}
2201
2202
/* Sleep checking until interface is running.
2203
Check every 0.25s, up to total time of delay */
2204
for(int i = 0; i < delay * 4; i++){
2205
if(interface_is_running(interface)){
2206
break;
2207
}
2208
struct timespec sleeptime = { .tv_nsec = 250000000 };
2209
ret = nanosleep(&sleeptime, NULL);
2210
if(ret == -1 and errno != EINTR){
2211
perror_plus("nanosleep");
2212
}
2213
}
2214
2215
errno = old_errno;
2216
return 0;
2217
}
2218
2219
__attribute__((nonnull, warn_unused_result))
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
2222
struct ifreq network;
2223
unsigned int if_index = if_nametoindex(interface);
2224
if(if_index == 0){
2225
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2226
errno = old_errno;
2227
return ENXIO;
2228
}
2229
if(interface_is_up(interface)){
2230
int ret_errno = 0;
2231
int ioctl_errno = 0;
2232
if(not get_flags(interface, &network) and debug){
2233
ret_errno = errno;
2234
fprintf_plus(stderr, "Failed to get flags for interface "
2235
"\"%s\"\n", interface);
2236
errno = old_errno;
2237
return ret_errno;
2238
}
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
2241
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2242
if(sd == -1){
2243
ret_errno = errno;
2244
perror_plus("socket");
2245
errno = old_errno;
2246
return ret_errno;
2247
}
2248
2249
if(debug){
2250
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2251
interface);
2252
}
2253
2254
/* Raise privileges */
2255
ret_errno = raise_privileges();
2256
if(ret_errno != 0){
2257
errno = ret_errno;
2258
perror_plus("Failed to raise privileges");
2259
}
2260
2261
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2262
ioctl_errno = errno;
2263
2264
/* If raise_privileges() succeeded above */
2265
if(ret_errno == 0){
2266
/* Lower privileges */
2267
ret_errno = lower_privileges();
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("Failed to lower privileges");
2271
}
2272
}
2273
2274
/* Close the socket */
2275
int ret = close(sd);
2276
if(ret == -1){
2277
perror_plus("close");
2278
}
2279
2280
if(ret_setflags == -1){
2281
errno = ioctl_errno;
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
errno = old_errno;
2284
return ioctl_errno;
2285
}
2286
} else if(debug){
2287
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2288
interface);
2289
}
2290
2291
errno = old_errno;
2292
return 0;
2293
}
2294
2295
1357
int main(int argc, char *argv[]){
2296
mandos_context mc = { .server = NULL, .dh_bits = 0,
2297
.priority = "SECURE256:!CTYPE-X.509"
2298
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2299
.current_server = NULL, .interfaces = NULL,
2300
.interfaces_size = 0 };
2301
1358
AvahiSServiceBrowser *sb = NULL;
2302
error_t ret_errno;
1359
int error;
2303
1360
int ret;
2304
1361
intmax_t tmpmax;
2305
1362
char *tmp;
2306
1363
int exitcode = EXIT_SUCCESS;
2307
char *interfaces_to_take_down = NULL;
2308
size_t interfaces_to_take_down_size = 0;
2309
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2310
char old_tempdir[] = "/tmp/mandosXXXXXX";
2311
char *tempdir = NULL;
1364
const char *interface = "";
1365
struct ifreq network;
1366
int sd = -1;
1367
bool take_down_interface = false;
1368
uid_t uid;
1369
gid_t gid;
1370
char tempdir[] = "/tmp/mandosXXXXXX";
1371
bool tempdir_created = false;
2312
1372
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2313
1373
const char *seckey = PATHDIR "/" SECKEY;
2314
1374
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
2316
char *interfaces_hooks = NULL;
2317
1375
2318
1376
bool gnutls_initialized = false;
2319
1377
bool gpgme_initialized = false;
2371
1429
.doc = "Bit length of the prime number used in the"
2372
1430
" Diffie-Hellman key exchange",
2373
1431
.group = 2 },
2374
{ .name = "dh-params", .key = 134,
2375
.arg = "FILE",
2376
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2377
" for the Diffie-Hellman key exchange",
2378
.group = 2 },
2379
1432
{ .name = "priority", .key = 130,
2380
1433
.arg = "STRING",
2381
1434
.doc = "GnuTLS priority string for the TLS handshake",
2386
1439
.group = 2 },
2387
1440
{ .name = "retry", .key = 132,
2388
1441
.arg = "SECONDS",
2389
.doc = "Retry interval used when denied by the Mandos server",
1442
.doc = "Retry interval used when denied by the mandos server",
2390
1443
.group = 2 },
2391
1444
{ .name = "network-hook-dir", .key = 133,
2392
1445
.arg = "DIR",
2415
1468
connect_to = arg;
2416
1469
break;
2417
1470
case 'i': /* --interface */
2418
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2419
arg, (int)',');
2420
if(ret_errno != 0){
2421
argp_error(state, "%s", strerror(ret_errno));
2422
}
1471
interface = arg;
2423
1472
break;
2424
1473
case 's': /* --seckey */
2425
1474
seckey = arg;
2436
1485
}
2437
1486
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2438
1487
break;
2439
case 134: /* --dh-params */
2440
dh_params_file = arg;
2441
break;
2442
1488
case 130: /* --priority */
2443
1489
mc.priority = arg;
2444
1490
break;
2471
1517
argp_state_help(state, state->out_stream,
2472
1518
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2473
1519
case 'V': /* --version */
1520
fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");
2474
1521
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2475
1522
exit(argp_err_exit_status);
2476
1523
break;
2484
1531
.args_doc = "",
2485
1532
.doc = "Mandos client -- Get and decrypt"
2486
1533
" passwords from a Mandos server" };
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2489
switch(ret_errno){
1534
ret = argp_parse(&argp, argc, argv,
1535
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1536
switch(ret){
2490
1537
case 0:
2491
1538
break;
2492
1539
case ENOMEM:
2493
1540
default:
2494
errno = ret_errno;
1541
errno = ret;
2495
1542
perror_plus("argp_parse");
2496
1543
exitcode = EX_OSERR;
2497
1544
goto end;
2500
1547
goto end;
2501
1548
}
2502
1549
}
2503
1550
2504
1551
{
2505
1552
/* Work around Debian bug #633582:
2506
<https://bugs.debian.org/633582> */
2507
2508
/* Re-raise privileges */
2509
ret = raise_privileges();
2510
if(ret != 0){
2511
errno = ret;
2512
perror_plus("Failed to raise privileges");
1553
<http://bugs.debian.org/633582> */
1554
struct stat st;
1555
1556
/* Re-raise priviliges */
1557
errno = 0;
1558
ret = seteuid(0);
1559
if(ret == -1){
1560
perror_plus("seteuid");
1561
}
1562
1563
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1564
int seckey_fd = open(seckey, O_RDONLY);
1565
if(seckey_fd == -1){
1566
perror_plus("open");
1567
} else {
1568
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1569
if(ret == -1){
1570
perror_plus("fstat");
1571
} else {
1572
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1573
ret = fchown(seckey_fd, uid, gid);
1574
if(ret == -1){
1575
perror_plus("fchown");
1576
}
1577
}
1578
}
1579
TEMP_FAILURE_RETRY(close(seckey_fd));
1580
}
1581
}
1582
1583
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1584
int pubkey_fd = open(pubkey, O_RDONLY);
1585
if(pubkey_fd == -1){
1586
perror_plus("open");
1587
} else {
1588
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1589
if(ret == -1){
1590
perror_plus("fstat");
1591
} else {
1592
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1593
ret = fchown(pubkey_fd, uid, gid);
1594
if(ret == -1){
1595
perror_plus("fchown");
1596
}
1597
}
1598
}
1599
TEMP_FAILURE_RETRY(close(pubkey_fd));
1600
}
1601
}
1602
1603
/* Lower privileges */
1604
errno = 0;
1605
ret = seteuid(uid);
1606
if(ret == -1){
1607
perror_plus("seteuid");
1608
}
1609
}
1610
1611
/* Find network hooks and run them */
1612
{
1613
struct dirent **direntries;
1614
struct dirent *direntry;
1615
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1616
alphasort);
1617
if(numhooks == -1){
1618
perror_plus("scandir");
2513
1619
} else {
2514
struct stat st;
2515
2516
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2517
int seckey_fd = open(seckey, O_RDONLY);
2518
if(seckey_fd == -1){
2519
perror_plus("open");
2520
} else {
2521
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2522
if(ret == -1){
2523
perror_plus("fstat");
2524
} else {
2525
if(S_ISREG(st.st_mode)
2526
and st.st_uid == 0 and st.st_gid == 0){
2527
ret = fchown(seckey_fd, uid, gid);
2528
if(ret == -1){
2529
perror_plus("fchown");
2530
}
2531
}
2532
}
2533
close(seckey_fd);
2534
}
2535
}
2536
2537
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2538
int pubkey_fd = open(pubkey, O_RDONLY);
2539
if(pubkey_fd == -1){
2540
perror_plus("open");
2541
} else {
2542
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2543
if(ret == -1){
2544
perror_plus("fstat");
2545
} else {
2546
if(S_ISREG(st.st_mode)
2547
and st.st_uid == 0 and st.st_gid == 0){
2548
ret = fchown(pubkey_fd, uid, gid);
2549
if(ret == -1){
2550
perror_plus("fchown");
2551
}
2552
}
2553
}
2554
close(pubkey_fd);
2555
}
2556
}
2557
2558
if(dh_params_file != NULL
2559
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2560
int dhparams_fd = open(dh_params_file, O_RDONLY);
2561
if(dhparams_fd == -1){
2562
perror_plus("open");
2563
} else {
2564
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2565
if(ret == -1){
2566
perror_plus("fstat");
2567
} else {
2568
if(S_ISREG(st.st_mode)
2569
and st.st_uid == 0 and st.st_gid == 0){
2570
ret = fchown(dhparams_fd, uid, gid);
2571
if(ret == -1){
2572
perror_plus("fchown");
2573
}
2574
}
2575
}
2576
close(dhparams_fd);
2577
}
2578
}
2579
2580
/* Lower privileges */
2581
ret = lower_privileges();
2582
if(ret != 0){
2583
errno = ret;
2584
perror_plus("Failed to lower privileges");
2585
}
2586
}
2587
}
2588
2589
/* Remove invalid interface names (except "none") */
2590
{
2591
char *interface = NULL;
2592
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2593
interface))){
2594
if(strcmp(interface, "none") != 0
2595
and if_nametoindex(interface) == 0){
2596
if(interface[0] != '\0'){
2597
fprintf_plus(stderr, "Not using nonexisting interface"
2598
" \"%s\"\n", interface);
2599
}
2600
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2601
interface = NULL;
2602
}
2603
}
2604
}
2605
2606
/* Run network hooks */
2607
{
2608
if(mc.interfaces != NULL){
2609
interfaces_hooks = malloc(mc.interfaces_size);
2610
if(interfaces_hooks == NULL){
2611
perror_plus("malloc");
2612
goto end;
2613
}
2614
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2615
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2616
}
2617
run_network_hooks("start", interfaces_hooks != NULL ?
2618
interfaces_hooks : "", delay);
1620
int devnull = open("/dev/null", O_RDONLY);
1621
for(int i = 0; i < numhooks; i++){
1622
direntry = direntries[0];
1623
char *fullname = NULL;
1624
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1625
if(ret < 0){
1626
perror_plus("asprintf");
1627
continue;
1628
}
1629
pid_t hook_pid = fork();
1630
if(hook_pid == 0){
1631
/* Child */
1632
dup2(devnull, STDIN_FILENO);
1633
close(devnull);
1634
dup2(STDERR_FILENO, STDOUT_FILENO);
1635
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
exit(1);
1639
}
1640
ret = setenv("DEVICE", interface, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
exit(1);
1644
}
1645
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1646
if(ret == -1){
1647
perror_plus("setenv");
1648
exit(1);
1649
}
1650
ret = setenv("MODE", "start", 1);
1651
if(ret == -1){
1652
perror_plus("setenv");
1653
exit(1);
1654
}
1655
char *delaystring;
1656
ret = asprintf(&delaystring, "%f", delay);
1657
if(ret == -1){
1658
perror_plus("asprintf");
1659
exit(1);
1660
}
1661
ret = setenv("DELAY", delaystring, 1);
1662
if(ret == -1){
1663
free(delaystring);
1664
perror_plus("setenv");
1665
exit(1);
1666
}
1667
free(delaystring);
1668
ret = execl(fullname, direntry->d_name, "start", NULL);
1669
perror_plus("execl");
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
free(fullname);
1675
continue;
1676
}
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1682
free(fullname);
1683
continue;
1684
}
1685
} else if(WIFSIGNALED(status)){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1687
" signal %d\n", direntry->d_name,
1688
WTERMSIG(status));
1689
free(fullname);
1690
continue;
1691
} else {
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" crashed\n",
1693
direntry->d_name);
1694
free(fullname);
1695
continue;
1696
}
1697
}
1698
free(fullname);
1699
if(quit_now){
1700
goto end;
1701
}
1702
}
1703
close(devnull);
1704
}
2619
1705
}
2620
1706
2621
1707
if(not debug){
2622
1708
avahi_set_log_function(empty_log);
2623
1709
}
2624
1710
1711
if(interface[0] == '\0'){
1712
struct dirent **direntries;
1713
/* First look for interfaces that are up */
1714
ret = scandir(sys_class_net, &direntries, up_interface,
1715
alphasort);
1716
if(ret == 0){
1717
/* No up interfaces, look for any good interfaces */
1718
free(direntries);
1719
ret = scandir(sys_class_net, &direntries, good_interface,
1720
alphasort);
1721
}
1722
if(ret >= 1){
1723
/* Pick the first interface returned */
1724
interface = strdup(direntries[0]->d_name);
1725
if(debug){
1726
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1727
}
1728
if(interface == NULL){
1729
perror_plus("malloc");
1730
free(direntries);
1731
exitcode = EXIT_FAILURE;
1732
goto end;
1733
}
1734
free(direntries);
1735
} else {
1736
free(direntries);
1737
fprintf_plus(stderr, "Could not find a network interface\n");
1738
exitcode = EXIT_FAILURE;
1739
goto end;
1740
}
1741
}
1742
2625
1743
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2626
1744
from the signal handler */
2627
1745
/* Initialize the pseudo-RNG for Avahi */
2628
1746
srand((unsigned int) time(NULL));
2629
simple_poll = avahi_simple_poll_new();
2630
if(simple_poll == NULL){
2631
fprintf_plus(stderr,
2632
"Avahi: Failed to create simple poll object.\n");
1747
mc.simple_poll = avahi_simple_poll_new();
1748
if(mc.simple_poll == NULL){
1749
fprintf_plus(stderr, "Avahi: Failed to create simple poll object.\n");
2633
1750
exitcode = EX_UNAVAILABLE;
2634
1751
goto end;
2635
1752
}
2697
1814
}
2698
1815
}
2699
1816
2700
/* If no interfaces were specified, make a list */
2701
if(mc.interfaces == NULL){
2702
struct dirent **direntries = NULL;
2703
/* Look for any good interfaces */
2704
ret = scandir(sys_class_net, &direntries, good_interface,
2705
alphasort);
2706
if(ret >= 1){
2707
/* Add all found interfaces to interfaces list */
2708
for(int i = 0; i < ret; ++i){
2709
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2710
direntries[i]->d_name);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
2713
perror_plus("argz_add");
2714
free(direntries[i]);
2715
continue;
2716
}
2717
if(debug){
2718
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2719
direntries[i]->d_name);
2720
}
2721
free(direntries[i]);
2722
}
2723
free(direntries);
1817
/* If the interface is down, bring it up */
1818
if(strcmp(interface, "none") != 0){
1819
if_index = (AvahiIfIndex) if_nametoindex(interface);
1820
if(if_index == 0){
1821
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1822
exitcode = EX_UNAVAILABLE;
1823
goto end;
1824
}
1825
1826
if(quit_now){
1827
goto end;
1828
}
1829
1830
/* Re-raise priviliges */
1831
errno = 0;
1832
ret = seteuid(0);
1833
if(ret == -1){
1834
perror_plus("seteuid");
1835
}
1836
1837
#ifdef __linux__
1838
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1839
messages about the network interface to mess up the prompt */
1840
ret = klogctl(8, NULL, 5);
1841
bool restore_loglevel = true;
1842
if(ret == -1){
1843
restore_loglevel = false;
1844
perror_plus("klogctl");
1845
}
1846
#endif /* __linux__ */
1847
1848
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd < 0){
1850
perror_plus("socket");
1851
exitcode = EX_OSERR;
1852
#ifdef __linux__
1853
if(restore_loglevel){
1854
ret = klogctl(7, NULL, 0);
1855
if(ret == -1){
1856
perror_plus("klogctl");
1857
}
1858
}
1859
#endif /* __linux__ */
1860
/* Lower privileges */
1861
errno = 0;
1862
ret = seteuid(uid);
1863
if(ret == -1){
1864
perror_plus("seteuid");
1865
}
1866
goto end;
1867
}
1868
strcpy(network.ifr_name, interface);
1869
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1870
if(ret == -1){
1871
perror_plus("ioctl SIOCGIFFLAGS");
1872
#ifdef __linux__
1873
if(restore_loglevel){
1874
ret = klogctl(7, NULL, 0);
1875
if(ret == -1){
1876
perror_plus("klogctl");
1877
}
1878
}
1879
#endif /* __linux__ */
1880
exitcode = EX_OSERR;
1881
/* Lower privileges */
1882
errno = 0;
1883
ret = seteuid(uid);
1884
if(ret == -1){
1885
perror_plus("seteuid");
1886
}
1887
goto end;
1888
}
1889
if((network.ifr_flags & IFF_UP) == 0){
1890
network.ifr_flags |= IFF_UP;
1891
take_down_interface = true;
1892
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1893
if(ret == -1){
1894
take_down_interface = false;
1895
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1896
exitcode = EX_OSERR;
1897
#ifdef __linux__
1898
if(restore_loglevel){
1899
ret = klogctl(7, NULL, 0);
1900
if(ret == -1){
1901
perror_plus("klogctl");
1902
}
1903
}
1904
#endif /* __linux__ */
1905
/* Lower privileges */
1906
errno = 0;
1907
ret = seteuid(uid);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1911
goto end;
1912
}
1913
}
1914
/* Sleep checking until interface is running.
1915
Check every 0.25s, up to total time of delay */
1916
for(int i=0; i < delay * 4; i++){
1917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1918
if(ret == -1){
1919
perror_plus("ioctl SIOCGIFFLAGS");
1920
} else if(network.ifr_flags & IFF_RUNNING){
1921
break;
1922
}
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
ret = nanosleep(&sleeptime, NULL);
1925
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1927
}
1928
}
1929
if(not take_down_interface){
1930
/* We won't need the socket anymore */
1931
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1932
if(ret == -1){
1933
perror_plus("close");
1934
}
1935
}
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
/* Restores kernel loglevel to default */
1939
ret = klogctl(7, NULL, 0);
1940
if(ret == -1){
1941
perror_plus("klogctl");
1942
}
1943
}
1944
#endif /* __linux__ */
1945
/* Lower privileges */
1946
errno = 0;
1947
if(take_down_interface){
1948
/* Lower privileges */
1949
ret = seteuid(uid);
1950
if(ret == -1){
1951
perror_plus("seteuid");
1952
}
2724
1953
} else {
2725
if(ret == 0){
2726
free(direntries);
2727
}
2728
fprintf_plus(stderr, "Could not find a network interface\n");
2729
exitcode = EXIT_FAILURE;
2730
goto end;
2731
}
2732
}
2733
2734
/* Bring up interfaces which are down, and remove any "none"s */
2735
{
2736
char *interface = NULL;
2737
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2738
interface))){
2739
/* If interface name is "none", stop bringing up interfaces.
2740
Also remove all instances of "none" from the list */
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
while((interface = argz_next(mc.interfaces,
2746
mc.interfaces_size, interface))){
2747
if(strcmp(interface, "none") == 0){
2748
argz_delete(&mc.interfaces, &mc.interfaces_size,
2749
interface);
2750
interface = NULL;
2751
}
2752
}
2753
break;
2754
}
2755
bool interface_was_up = interface_is_up(interface);
2756
errno = bring_up_interface(interface, delay);
2757
if(not interface_was_up){
2758
if(errno != 0){
2759
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2760
" %s\n", interface, strerror(errno));
2761
} else {
2762
errno = argz_add(&interfaces_to_take_down,
2763
&interfaces_to_take_down_size,
2764
interface);
2765
if(errno != 0){
2766
perror_plus("argz_add");
2767
}
2768
}
2769
}
2770
}
2771
if(debug and (interfaces_to_take_down == NULL)){
2772
fprintf_plus(stderr, "No interfaces were brought up\n");
2773
}
2774
}
2775
2776
/* If we only got one interface, explicitly use only that one */
2777
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2778
if(debug){
2779
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2780
mc.interfaces);
2781
}
2782
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1954
/* Lower privileges permanently */
1955
ret = setuid(uid);
1956
if(ret == -1){
1957
perror_plus("setuid");
1958
}
1959
}
2783
1960
}
2784
1961
2785
1962
if(quit_now){
2786
1963
goto end;
2787
1964
}
2788
1965
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1966
ret = init_gnutls_global(pubkey, seckey);
2790
1967
if(ret == -1){
2791
1968
fprintf_plus(stderr, "init_gnutls_global failed\n");
2792
1969
exitcode = EX_UNAVAILABLE;
2799
1976
goto end;
2800
1977
}
2801
1978
2802
/* Try /run/tmp before /tmp */
2803
tempdir = mkdtemp(run_tempdir);
2804
if(tempdir == NULL and errno == ENOENT){
2805
if(debug){
2806
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2807
run_tempdir, old_tempdir);
2808
}
2809
tempdir = mkdtemp(old_tempdir);
2810
}
2811
if(tempdir == NULL){
1979
if(mkdtemp(tempdir) == NULL){
2812
1980
perror_plus("mkdtemp");
2813
1981
goto end;
2814
1982
}
1983
tempdir_created = true;
2815
1984
2816
1985
if(quit_now){
2817
1986
goto end;
2818
1987
}
2819
1988
2820
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
1989
if(not init_gpgme(pubkey, seckey, tempdir)){
2821
1990
fprintf_plus(stderr, "init_gpgme failed\n");
2822
1991
exitcode = EX_UNAVAILABLE;
2823
1992
goto end;
2833
2002
/* Connect directly, do not use Zeroconf */
2834
2003
/* (Mainly meant for debugging) */
2835
2004
char *address = strrchr(connect_to, ':');
2836
2837
2005
if(address == NULL){
2838
2006
fprintf_plus(stderr, "No colon in address\n");
2839
2007
exitcode = EX_USAGE;
2844
2012
goto end;
2845
2013
}
2846
2014
2847
in_port_t port;
2015
uint16_t port;
2848
2016
errno = 0;
2849
2017
tmpmax = strtoimax(address+1, &tmp, 10);
2850
2018
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2851
or tmpmax != (in_port_t)tmpmax){
2019
or tmpmax != (uint16_t)tmpmax){
2852
2020
fprintf_plus(stderr, "Bad port number\n");
2853
2021
exitcode = EX_USAGE;
2854
2022
goto end;
2855
2023
}
2856
2024
2857
2025
if(quit_now){
2858
2026
goto end;
2859
2027
}
2860
2028
2861
port = (in_port_t)tmpmax;
2029
port = (uint16_t)tmpmax;
2862
2030
*address = '\0';
2863
2031
/* Colon in address indicates IPv6 */
2864
2032
int af;
2880
2048
}
2881
2049
2882
2050
while(not quit_now){
2883
ret = start_mandos_communication(address, port, if_index, af,
2884
&mc);
2051
ret = start_mandos_communication(address, port, if_index, af);
2885
2052
if(quit_now or ret == 0){
2886
2053
break;
2887
2054
}
2888
2055
if(debug){
2889
fprintf_plus(stderr, "Retrying in %d seconds\n",
2890
(int)retry_interval);
2056
fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);
2891
2057
}
2892
sleep((unsigned int)retry_interval);
2058
sleep((int)retry_interval);
2893
2059
}
2894
2060
2895
if(not quit_now){
2061
if (not quit_now){
2896
2062
exitcode = EXIT_SUCCESS;
2897
2063
}
2898
2064
2913
2079
config.publish_domain = 0;
2914
2080
2915
2081
/* Allocate a new server */
2916
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2917
&config, NULL, NULL, &ret);
2082
mc.server = avahi_server_new(avahi_simple_poll_get
2083
(mc.simple_poll), &config, NULL,
2084
NULL, &error);
2918
2085
2919
2086
/* Free the Avahi configuration data */
2920
2087
avahi_server_config_free(&config);
2923
2090
/* Check if creating the Avahi server object succeeded */
2924
2091
if(mc.server == NULL){
2925
2092
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2926
avahi_strerror(ret));
2093
avahi_strerror(error));
2927
2094
exitcode = EX_UNAVAILABLE;
2928
2095
goto end;
2929
2096
}
2935
2102
/* Create the Avahi service browser */
2936
2103
sb = avahi_s_service_browser_new(mc.server, if_index,
2937
2104
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2938
NULL, 0, browse_callback,
2939
(void *)&mc);
2105
NULL, 0, browse_callback, NULL);
2940
2106
if(sb == NULL){
2941
2107
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2942
avahi_strerror(avahi_server_errno(mc.server)));
2108
avahi_strerror(avahi_server_errno(mc.server)));
2943
2109
exitcode = EX_UNAVAILABLE;
2944
2110
goto end;
2945
2111
}
2953
2119
if(debug){
2954
2120
fprintf_plus(stderr, "Starting Avahi loop search\n");
2955
2121
}
2956
2957
ret = avahi_loop_with_timeout(simple_poll,
2958
(int)(retry_interval * 1000), &mc);
2122
2123
ret = avahi_loop_with_timeout(mc.simple_poll,
2124
(int)(retry_interval * 1000));
2959
2125
if(debug){
2960
2126
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2961
(ret == 0) ? "successfully" : "with error");
2127
(ret == 0) ? "successfully" : "with error");
2962
2128
}
2963
2129
2964
2130
end:
2965
2131
2966
2132
if(debug){
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
2971
} else {
2972
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2973
}
2133
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2974
2134
}
2975
2135
2976
2136
/* Cleanup things */
2977
free(mc.interfaces);
2978
2979
2137
if(sb != NULL)
2980
2138
avahi_s_service_browser_free(sb);
2981
2139
2982
2140
if(mc.server != NULL)
2983
2141
avahi_server_free(mc.server);
2984
2142
2985
if(simple_poll != NULL)
2986
avahi_simple_poll_free(simple_poll);
2143
if(mc.simple_poll != NULL)
2144
avahi_simple_poll_free(mc.simple_poll);
2987
2145
2988
2146
if(gnutls_initialized){
2989
2147
gnutls_certificate_free_credentials(mc.cred);
2148
gnutls_global_deinit();
2990
2149
gnutls_dh_params_deinit(mc.dh_params);
2991
2150
}
2992
2151
2993
2152
if(gpgme_initialized){
2994
2153
gpgme_release(mc.ctx);
2995
2154
}
2996
2155
2997
2156
/* Cleans up the circular linked list of Mandos servers the client
2998
2157
has seen */
2999
2158
if(mc.current_server != NULL){
3000
2159
mc.current_server->prev->next = NULL;
3001
2160
while(mc.current_server != NULL){
3002
2161
server *next = mc.current_server->next;
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic push
3005
#pragma GCC diagnostic ignored "-Wcast-qual"
3006
#endif
3007
free((char *)(mc.current_server->ip));
3008
#ifdef __GNUC__
3009
#pragma GCC diagnostic pop
3010
#endif
3011
2162
free(mc.current_server);
3012
2163
mc.current_server = next;
3013
2164
}
3014
2165
}
3015
2166
3016
/* Re-raise privileges */
3017
{
3018
ret = raise_privileges();
3019
if(ret != 0){
3020
errno = ret;
3021
perror_plus("Failed to raise privileges");
3022
} else {
3023
3024
/* Run network hooks */
3025
run_network_hooks("stop", interfaces_hooks != NULL ?
3026
interfaces_hooks : "", delay);
3027
3028
/* Take down the network interfaces which were brought up */
3029
{
3030
char *interface = NULL;
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3033
interface))){
3034
ret = take_down_interface(interface);
3035
if(ret != 0){
3036
errno = ret;
3037
perror_plus("Failed to take down interface");
3038
}
3039
}
3040
if(debug and (interfaces_to_take_down == NULL)){
3041
fprintf_plus(stderr, "No interfaces needed to be taken"
3042
" down\n");
3043
}
3044
}
2167
/* XXX run network hooks "stop" here */
2168
2169
/* Take down the network interface */
2170
if(take_down_interface){
2171
/* Re-raise priviliges */
2172
errno = 0;
2173
ret = seteuid(0);
2174
if(ret == -1){
2175
perror_plus("seteuid");
3045
2176
}
3046
3047
ret = lower_privileges_permanently();
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to lower privileges permanently");
2177
if(geteuid() == 0){
2178
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2179
if(ret == -1){
2180
perror_plus("ioctl SIOCGIFFLAGS");
2181
} else if(network.ifr_flags & IFF_UP){
2182
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2183
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2184
if(ret == -1){
2185
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2186
}
2187
}
2188
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2189
if(ret == -1){
2190
perror_plus("close");
2191
}
2192
/* Lower privileges permanently */
2193
errno = 0;
2194
ret = setuid(uid);
2195
if(ret == -1){
2196
perror_plus("setuid");
2197
}
3051
2198
}
3052
2199
}
3053
2200
3054
free(interfaces_to_take_down);
3055
free(interfaces_hooks);
3056
3057
void clean_dir_at(int base, const char * const dirname,
3058
uintmax_t level){
2201
/* Removes the GPGME temp directory and all files inside */
2202
if(tempdir_created){
3059
2203
struct dirent **direntries = NULL;
3060
int dret;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3062
O_RDONLY
3063
| O_NOFOLLOW
3064
| O_DIRECTORY
3065
| O_PATH));
3066
if(dir_fd == -1){
3067
perror_plus("open");
3068
return;
3069
}
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
2204
struct dirent *direntry = NULL;
2205
int numentries = scandir(tempdir, &direntries, notdotentries,
2206
alphasort);
2207
if (numentries > 0){
3073
2208
for(int i = 0; i < numentries; i++){
3074
if(debug){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3077
}
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3079
if(dret == -1){
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3082
AT_REMOVEDIR);
3083
}
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3089
dret = 0;
3090
}
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3094
}
3095
}
3096
free(direntries[i]);
3097
}
3098
3099
/* need to clean even if 0 because man page doesn't specify */
3100
free(direntries);
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3104
}
3105
} else {
3106
perror_plus("scandirat");
3107
}
3108
close(dir_fd);
3109
}
3110
3111
/* Removes the GPGME temp directory and all files inside */
3112
if(tempdir != NULL){
3113
clean_dir_at(-1, tempdir, 0);
2209
direntry = direntries[i];
2210
char *fullname = NULL;
2211
ret = asprintf(&fullname, "%s/%s", tempdir,
2212
direntry->d_name);
2213
if(ret < 0){
2214
perror_plus("asprintf");
2215
continue;
2216
}
2217
ret = remove(fullname);
2218
if(ret == -1){
2219
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname, strerror(errno));
2220
}
2221
free(fullname);
2222
}
2223
}
2224
2225
/* need to clean even if 0 because man page doesn't specify */
2226
free(direntries);
2227
if (numentries == -1){
2228
perror_plus("scandir");
2229
}
2230
ret = rmdir(tempdir);
2231
if(ret == -1 and errno != ENOENT){
2232
perror_plus("rmdir");
2233
}
3114
2234
}
3115
2235
3116
2236
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0