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- Committer: Teddy Hogeborn
- Date: 2018-04-02 10:24:15 UTC
- Revision ID: teddy@recompile.se-20180402102415-xrsu0wxhnmlaq29a
Minor code cleanup
* plugins.d/mandos-client.c (pgp_packet_decrypt): Use a "for"
statement instead of a "while" statement to move initialization and
stepping into the for statement, and reduce loop variable name
length.
* plugins.d/mandos-client.c (pgp_packet_decrypt): Use a "for"
statement instead of a "while" statement to move initialization and
stepping into the for statement, and reduce loop variable name
length.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
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
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
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
55
57
opendir(), DIR */
56
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
79
*/
74
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
81
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
78
85
#include <iso646.h> /* not, or, and */
79
86
#include <argp.h> /* struct argp_option, error_t, struct
80
87
argp_state, struct argp,
88
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
96
WEXITSTATUS(), WTERMSIG() */
90
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() */
91
104
92
105
#ifdef __linux__
93
106
#include <sys/klog.h> /* klogctl() */
135
148
static const char sys_class_net[] = "/sys/class/net";
136
149
char *connect_to = NULL;
137
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
138
154
139
155
/* Doubly linked list that need to be circularly linked when used */
140
156
typedef struct server{
141
157
const char *ip;
142
uint16_t port;
158
in_port_t port;
143
159
AvahiIfIndex if_index;
144
160
int af;
145
161
struct timespec last_seen;
149
165
150
166
/* Used for passing in values through the Avahi callback functions */
151
167
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
168
AvahiServer *server;
154
169
gnutls_certificate_credentials_t cred;
155
170
unsigned int dh_bits;
157
172
const char *priority;
158
173
gpgme_ctx_t ctx;
159
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
160
177
} mandos_context;
161
178
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
167
181
168
182
sig_atomic_t quit_now = 0;
169
183
int signal_received = 0;
177
191
perror(print_text);
178
192
}
179
193
180
__attribute__((format (gnu_printf, 2, 3)))
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
195
int fprintf_plus(FILE *stream, const char *format, ...){
182
196
va_list ap;
183
197
va_start (ap, format);
184
198
185
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
200
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
202
}
189
203
190
204
/*
192
206
* bytes. "buffer_capacity" is how much is currently allocated,
193
207
* "buffer_length" is how much is already used.
194
208
*/
209
__attribute__((nonnull, warn_unused_result))
195
210
size_t incbuffer(char **buffer, size_t buffer_length,
196
211
size_t buffer_capacity){
197
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
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;
200
219
return 0;
201
220
}
221
*buffer = new_buf;
202
222
buffer_capacity += BUFFER_SIZE;
203
223
}
204
224
return buffer_capacity;
205
225
}
206
226
207
227
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
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){
210
231
int ret;
211
232
server *new_server = malloc(sizeof(server));
212
233
if(new_server == NULL){
219
240
.af = af };
220
241
if(new_server->ip == NULL){
221
242
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);
222
258
return false;
223
259
}
224
260
/* Special case of first server */
225
if (mc.current_server == NULL){
261
if(*current_server == NULL){
226
262
new_server->next = new_server;
227
263
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
264
*current_server = new_server;
230
265
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
233
269
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
270
(*current_server)->prev = new_server;
240
271
}
241
272
return true;
242
273
}
244
275
/*
245
276
* Initialize GPGME.
246
277
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
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){
249
283
gpgme_error_t rc;
250
284
gpgme_engine_info_t engine_info;
251
285
252
253
286
/*
254
287
* Helper function to insert pub and seckey to the engine keyring.
255
288
*/
256
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
257
290
int ret;
258
291
int fd;
259
292
gpgme_data_t pgp_data;
271
304
return false;
272
305
}
273
306
274
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
275
308
if(rc != GPG_ERR_NO_ERROR){
276
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
310
gpgme_strsource(rc), gpgme_strerror(rc));
278
311
return false;
279
312
}
313
{
314
gpgme_import_result_t import_result
315
= gpgme_op_import_result(mc->ctx);
316
if((import_result->imported < 1
317
or import_result->not_imported > 0)
318
and import_result->unchanged == 0){
319
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
320
fprintf_plus(stderr,
321
"The total number of considered keys: %d\n",
322
import_result->considered);
323
fprintf_plus(stderr,
324
"The number of keys without user ID: %d\n",
325
import_result->no_user_id);
326
fprintf_plus(stderr,
327
"The total number of imported keys: %d\n",
328
import_result->imported);
329
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
330
import_result->imported_rsa);
331
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
332
import_result->unchanged);
333
fprintf_plus(stderr, "The number of new user IDs: %d\n",
334
import_result->new_user_ids);
335
fprintf_plus(stderr, "The number of new sub keys: %d\n",
336
import_result->new_sub_keys);
337
fprintf_plus(stderr, "The number of new signatures: %d\n",
338
import_result->new_signatures);
339
fprintf_plus(stderr, "The number of new revocations: %d\n",
340
import_result->new_revocations);
341
fprintf_plus(stderr,
342
"The total number of secret keys read: %d\n",
343
import_result->secret_read);
344
fprintf_plus(stderr,
345
"The number of imported secret keys: %d\n",
346
import_result->secret_imported);
347
fprintf_plus(stderr,
348
"The number of unchanged secret keys: %d\n",
349
import_result->secret_unchanged);
350
fprintf_plus(stderr, "The number of keys not imported: %d\n",
351
import_result->not_imported);
352
for(gpgme_import_status_t import_status
353
= import_result->imports;
354
import_status != NULL;
355
import_status = import_status->next){
356
fprintf_plus(stderr, "Import status for key: %s\n",
357
import_status->fpr);
358
if(import_status->result != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Import result: %s: %s\n",
360
gpgme_strsource(import_status->result),
361
gpgme_strerror(import_status->result));
362
}
363
fprintf_plus(stderr, "Key status:\n");
364
fprintf_plus(stderr,
365
import_status->status & GPGME_IMPORT_NEW
366
? "The key was new.\n"
367
: "The key was not new.\n");
368
fprintf_plus(stderr,
369
import_status->status & GPGME_IMPORT_UID
370
? "The key contained new user IDs.\n"
371
: "The key did not contain new user IDs.\n");
372
fprintf_plus(stderr,
373
import_status->status & GPGME_IMPORT_SIG
374
? "The key contained new signatures.\n"
375
: "The key did not contain new signatures.\n");
376
fprintf_plus(stderr,
377
import_status->status & GPGME_IMPORT_SUBKEY
378
? "The key contained new sub keys.\n"
379
: "The key did not contain new sub keys.\n");
380
fprintf_plus(stderr,
381
import_status->status & GPGME_IMPORT_SECRET
382
? "The key contained a secret key.\n"
383
: "The key did not contain a secret key.\n");
384
}
385
return false;
386
}
387
}
280
388
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
389
ret = close(fd);
282
390
if(ret == -1){
283
391
perror_plus("close");
284
392
}
321
429
}
322
430
323
431
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
432
rc = gpgme_new(&(mc->ctx));
325
433
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
329
436
return false;
330
437
}
331
438
340
447
* Decrypt OpenPGP data.
341
448
* Returns -1 on error
342
449
*/
450
__attribute__((nonnull, warn_unused_result))
343
451
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
452
size_t crypto_size,
345
char **plaintext){
453
char **plaintext,
454
mandos_context *mc){
346
455
gpgme_data_t dh_crypto, dh_plain;
347
456
gpgme_error_t rc;
348
457
ssize_t ret;
365
474
/* Create new empty GPGME data buffer for the plaintext */
366
475
rc = gpgme_data_new(&dh_plain);
367
476
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
370
478
gpgme_strsource(rc), gpgme_strerror(rc));
371
479
gpgme_data_release(dh_crypto);
372
480
return -1;
374
482
375
483
/* Decrypt data from the cryptotext data buffer to the plaintext
376
484
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
485
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
486
if(rc != GPG_ERR_NO_ERROR){
379
487
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
488
gpgme_strsource(rc), gpgme_strerror(rc));
381
489
plaintext_length = -1;
382
490
if(debug){
383
491
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
492
result = gpgme_op_decrypt_result(mc->ctx);
385
493
if(result == NULL){
386
494
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
495
} else {
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
496
if(result->unsupported_algorithm != NULL) {
497
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
498
result->unsupported_algorithm);
499
}
500
fprintf_plus(stderr, "Wrong key usage: %s\n",
501
result->wrong_key_usage ? "Yes" : "No");
392
502
if(result->file_name != NULL){
393
503
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
504
}
395
gpgme_recipient_t recipient;
396
recipient = result->recipients;
397
while(recipient != NULL){
505
506
for(gpgme_recipient_t r = result->recipients; r != NULL;
507
r = r->next){
398
508
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
509
gpgme_pubkey_algo_name(r->pubkey_algo));
510
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
402
511
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
405
recipient = recipient->next;
512
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
406
513
}
407
514
}
408
515
}
464
571
return plaintext_length;
465
572
}
466
573
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
470
if(ret == NULL)
471
ret = "(unknown)";
472
return ret;
574
__attribute__((warn_unused_result, const))
575
static const char *safe_string(const char *str){
576
if(str == NULL)
577
return "(unknown)";
578
return str;
579
}
580
581
__attribute__((warn_unused_result))
582
static const char *safer_gnutls_strerror(int value){
583
const char *ret = gnutls_strerror(value);
584
return safe_string(ret);
473
585
}
474
586
475
587
/* GnuTLS log function callback */
588
__attribute__((nonnull))
476
589
static void debuggnutls(__attribute__((unused)) int level,
477
590
const char* string){
478
591
fprintf_plus(stderr, "GnuTLS: %s", string);
479
592
}
480
593
594
__attribute__((nonnull(1, 2, 4), warn_unused_result))
481
595
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
596
const char *seckeyfilename,
597
const char *dhparamsfilename,
598
mandos_context *mc){
483
599
int ret;
600
unsigned int uret;
484
601
485
602
if(debug){
486
603
fprintf_plus(stderr, "Initializing GnuTLS\n");
487
604
}
488
605
489
ret = gnutls_global_init();
490
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
493
return -1;
494
}
495
496
606
if(debug){
497
607
/* "Use a log level over 10 to enable all debugging options."
498
608
* - GnuTLS manual
502
612
}
503
613
504
614
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
615
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
616
if(ret != GNUTLS_E_SUCCESS){
507
617
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
618
safer_gnutls_strerror(ret));
509
gnutls_global_deinit();
510
619
return -1;
511
620
}
512
621
518
627
}
519
628
520
629
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
630
(mc->cred, pubkeyfilename, seckeyfilename,
522
631
GNUTLS_OPENPGP_FMT_BASE64);
523
632
if(ret != GNUTLS_E_SUCCESS){
524
633
fprintf_plus(stderr,
530
639
}
531
640
532
641
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
642
ret = gnutls_dh_params_init(&mc->dh_params);
534
643
if(ret != GNUTLS_E_SUCCESS){
535
644
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
645
" initialization: %s\n",
537
646
safer_gnutls_strerror(ret));
538
647
goto globalfail;
539
648
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
649
/* If a Diffie-Hellman parameters file was given, try to use it */
650
if(dhparamsfilename != NULL){
651
gnutls_datum_t params = { .data = NULL, .size = 0 };
652
do {
653
int dhpfile = open(dhparamsfilename, O_RDONLY);
654
if(dhpfile == -1){
655
perror_plus("open");
656
dhparamsfilename = NULL;
657
break;
658
}
659
size_t params_capacity = 0;
660
while(true){
661
params_capacity = incbuffer((char **)¶ms.data,
662
(size_t)params.size,
663
(size_t)params_capacity);
664
if(params_capacity == 0){
665
perror_plus("incbuffer");
666
free(params.data);
667
params.data = NULL;
668
dhparamsfilename = NULL;
669
break;
670
}
671
ssize_t bytes_read = read(dhpfile,
672
params.data + params.size,
673
BUFFER_SIZE);
674
/* EOF */
675
if(bytes_read == 0){
676
break;
677
}
678
/* check bytes_read for failure */
679
if(bytes_read < 0){
680
perror_plus("read");
681
free(params.data);
682
params.data = NULL;
683
dhparamsfilename = NULL;
684
break;
685
}
686
params.size += (unsigned int)bytes_read;
687
}
688
ret = close(dhpfile);
689
if(ret == -1){
690
perror_plus("close");
691
}
692
if(params.data == NULL){
693
dhparamsfilename = NULL;
694
}
695
if(dhparamsfilename == NULL){
696
break;
697
}
698
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
699
GNUTLS_X509_FMT_PEM);
700
if(ret != GNUTLS_E_SUCCESS){
701
fprintf_plus(stderr, "Failed to parse DH parameters in file"
702
" \"%s\": %s\n", dhparamsfilename,
703
safer_gnutls_strerror(ret));
704
dhparamsfilename = NULL;
705
}
706
free(params.data);
707
} while(false);
708
}
709
if(dhparamsfilename == NULL){
710
if(mc->dh_bits == 0){
711
/* Find out the optimal number of DH bits */
712
/* Try to read the private key file */
713
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
714
do {
715
int secfile = open(seckeyfilename, O_RDONLY);
716
if(secfile == -1){
717
perror_plus("open");
718
break;
719
}
720
size_t buffer_capacity = 0;
721
while(true){
722
buffer_capacity = incbuffer((char **)&buffer.data,
723
(size_t)buffer.size,
724
(size_t)buffer_capacity);
725
if(buffer_capacity == 0){
726
perror_plus("incbuffer");
727
free(buffer.data);
728
buffer.data = NULL;
729
break;
730
}
731
ssize_t bytes_read = read(secfile,
732
buffer.data + buffer.size,
733
BUFFER_SIZE);
734
/* EOF */
735
if(bytes_read == 0){
736
break;
737
}
738
/* check bytes_read for failure */
739
if(bytes_read < 0){
740
perror_plus("read");
741
free(buffer.data);
742
buffer.data = NULL;
743
break;
744
}
745
buffer.size += (unsigned int)bytes_read;
746
}
747
close(secfile);
748
} while(false);
749
/* If successful, use buffer to parse private key */
750
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
751
if(buffer.data != NULL){
752
{
753
gnutls_openpgp_privkey_t privkey = NULL;
754
ret = gnutls_openpgp_privkey_init(&privkey);
755
if(ret != GNUTLS_E_SUCCESS){
756
fprintf_plus(stderr, "Error initializing OpenPGP key"
757
" structure: %s",
758
safer_gnutls_strerror(ret));
759
free(buffer.data);
760
buffer.data = NULL;
761
} else {
762
ret = gnutls_openpgp_privkey_import
763
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
764
if(ret != GNUTLS_E_SUCCESS){
765
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
766
safer_gnutls_strerror(ret));
767
privkey = NULL;
768
}
769
free(buffer.data);
770
buffer.data = NULL;
771
if(privkey != NULL){
772
/* Use private key to suggest an appropriate
773
sec_param */
774
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
775
gnutls_openpgp_privkey_deinit(privkey);
776
if(debug){
777
fprintf_plus(stderr, "This OpenPGP key implies using"
778
" a GnuTLS security parameter \"%s\".\n",
779
safe_string(gnutls_sec_param_get_name
780
(sec_param)));
781
}
782
}
783
}
784
}
785
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
786
/* Err on the side of caution */
787
sec_param = GNUTLS_SEC_PARAM_ULTRA;
788
if(debug){
789
fprintf_plus(stderr, "Falling back to security parameter"
790
" \"%s\"\n",
791
safe_string(gnutls_sec_param_get_name
792
(sec_param)));
793
}
794
}
795
}
796
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
797
if(uret != 0){
798
mc->dh_bits = uret;
799
if(debug){
800
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
801
" implies %u DH bits; using that.\n",
802
safe_string(gnutls_sec_param_get_name
803
(sec_param)),
804
mc->dh_bits);
805
}
806
} else {
807
fprintf_plus(stderr, "Failed to get implied number of DH"
808
" bits for security parameter \"%s\"): %s\n",
809
safe_string(gnutls_sec_param_get_name
810
(sec_param)),
811
safer_gnutls_strerror(ret));
812
goto globalfail;
813
}
814
} else if(debug){
815
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
816
mc->dh_bits);
817
}
818
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
819
if(ret != GNUTLS_E_SUCCESS){
820
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
821
" bits): %s\n", mc->dh_bits,
822
safer_gnutls_strerror(ret));
823
goto globalfail;
824
}
825
}
826
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
827
549
828
return 0;
550
829
551
830
globalfail:
552
831
553
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
832
gnutls_certificate_free_credentials(mc->cred);
833
gnutls_dh_params_deinit(mc->dh_params);
556
834
return -1;
557
835
}
558
836
559
static int init_gnutls_session(gnutls_session_t *session){
837
__attribute__((nonnull, warn_unused_result))
838
static int init_gnutls_session(gnutls_session_t *session,
839
mandos_context *mc){
560
840
int ret;
561
841
/* GnuTLS session creation */
562
842
do {
574
854
{
575
855
const char *err;
576
856
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
857
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
858
if(quit_now){
579
859
gnutls_deinit(*session);
580
860
return -1;
591
871
592
872
do {
593
873
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
874
mc->cred);
595
875
if(quit_now){
596
876
gnutls_deinit(*session);
597
877
return -1;
607
887
/* ignore client certificate if any. */
608
888
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
889
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
611
612
890
return 0;
613
891
}
614
892
616
894
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
895
__attribute__((unused)) const char *txt){}
618
896
897
/* Set effective uid to 0, return errno */
898
__attribute__((warn_unused_result))
899
int raise_privileges(void){
900
int old_errno = errno;
901
int ret = 0;
902
if(seteuid(0) == -1){
903
ret = errno;
904
}
905
errno = old_errno;
906
return ret;
907
}
908
909
/* Set effective and real user ID to 0. Return errno. */
910
__attribute__((warn_unused_result))
911
int raise_privileges_permanently(void){
912
int old_errno = errno;
913
int ret = raise_privileges();
914
if(ret != 0){
915
errno = old_errno;
916
return ret;
917
}
918
if(setuid(0) == -1){
919
ret = errno;
920
}
921
errno = old_errno;
922
return ret;
923
}
924
925
/* Set effective user ID to unprivileged saved user ID */
926
__attribute__((warn_unused_result))
927
int lower_privileges(void){
928
int old_errno = errno;
929
int ret = 0;
930
if(seteuid(uid) == -1){
931
ret = errno;
932
}
933
errno = old_errno;
934
return ret;
935
}
936
937
/* Lower privileges permanently */
938
__attribute__((warn_unused_result))
939
int lower_privileges_permanently(void){
940
int old_errno = errno;
941
int ret = 0;
942
if(setuid(uid) == -1){
943
ret = errno;
944
}
945
errno = old_errno;
946
return ret;
947
}
948
949
/* Helper function to add_local_route() and delete_local_route() */
950
__attribute__((nonnull, warn_unused_result))
951
static bool add_delete_local_route(const bool add,
952
const char *address,
953
AvahiIfIndex if_index){
954
int ret;
955
char helper[] = "mandos-client-iprouteadddel";
956
char add_arg[] = "add";
957
char delete_arg[] = "delete";
958
char debug_flag[] = "--debug";
959
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
960
if(pluginhelperdir == NULL){
961
if(debug){
962
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
963
" variable not set; cannot run helper\n");
964
}
965
return false;
966
}
967
968
char interface[IF_NAMESIZE];
969
if(if_indextoname((unsigned int)if_index, interface) == NULL){
970
perror_plus("if_indextoname");
971
return false;
972
}
973
974
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
975
if(devnull == -1){
976
perror_plus("open(\"/dev/null\", O_RDONLY)");
977
return false;
978
}
979
pid_t pid = fork();
980
if(pid == 0){
981
/* Child */
982
/* Raise privileges */
983
errno = raise_privileges_permanently();
984
if(errno != 0){
985
perror_plus("Failed to raise privileges");
986
/* _exit(EX_NOPERM); */
987
} else {
988
/* Set group */
989
errno = 0;
990
ret = setgid(0);
991
if(ret == -1){
992
perror_plus("setgid");
993
_exit(EX_NOPERM);
994
}
995
/* Reset supplementary groups */
996
errno = 0;
997
ret = setgroups(0, NULL);
998
if(ret == -1){
999
perror_plus("setgroups");
1000
_exit(EX_NOPERM);
1001
}
1002
}
1003
ret = dup2(devnull, STDIN_FILENO);
1004
if(ret == -1){
1005
perror_plus("dup2(devnull, STDIN_FILENO)");
1006
_exit(EX_OSERR);
1007
}
1008
ret = close(devnull);
1009
if(ret == -1){
1010
perror_plus("close");
1011
_exit(EX_OSERR);
1012
}
1013
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1014
if(ret == -1){
1015
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1016
_exit(EX_OSERR);
1017
}
1018
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1019
O_RDONLY
1020
| O_DIRECTORY
1021
| O_PATH
1022
| O_CLOEXEC));
1023
if(helperdir_fd == -1){
1024
perror_plus("open");
1025
_exit(EX_UNAVAILABLE);
1026
}
1027
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1028
helper, O_RDONLY));
1029
if(helper_fd == -1){
1030
perror_plus("openat");
1031
close(helperdir_fd);
1032
_exit(EX_UNAVAILABLE);
1033
}
1034
close(helperdir_fd);
1035
#ifdef __GNUC__
1036
#pragma GCC diagnostic push
1037
#pragma GCC diagnostic ignored "-Wcast-qual"
1038
#endif
1039
if(fexecve(helper_fd, (char *const [])
1040
{ helper, add ? add_arg : delete_arg, (char *)address,
1041
interface, debug ? debug_flag : NULL, NULL },
1042
environ) == -1){
1043
#ifdef __GNUC__
1044
#pragma GCC diagnostic pop
1045
#endif
1046
perror_plus("fexecve");
1047
_exit(EXIT_FAILURE);
1048
}
1049
}
1050
if(pid == -1){
1051
perror_plus("fork");
1052
return false;
1053
}
1054
int status;
1055
pid_t pret = -1;
1056
errno = 0;
1057
do {
1058
pret = waitpid(pid, &status, 0);
1059
if(pret == -1 and errno == EINTR and quit_now){
1060
int errno_raising = 0;
1061
if((errno = raise_privileges()) != 0){
1062
errno_raising = errno;
1063
perror_plus("Failed to raise privileges in order to"
1064
" kill helper program");
1065
}
1066
if(kill(pid, SIGTERM) == -1){
1067
perror_plus("kill");
1068
}
1069
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1070
perror_plus("Failed to lower privileges after killing"
1071
" helper program");
1072
}
1073
return false;
1074
}
1075
} while(pret == -1 and errno == EINTR);
1076
if(pret == -1){
1077
perror_plus("waitpid");
1078
return false;
1079
}
1080
if(WIFEXITED(status)){
1081
if(WEXITSTATUS(status) != 0){
1082
fprintf_plus(stderr, "Error: iprouteadddel exited"
1083
" with status %d\n", WEXITSTATUS(status));
1084
return false;
1085
}
1086
return true;
1087
}
1088
if(WIFSIGNALED(status)){
1089
fprintf_plus(stderr, "Error: iprouteadddel died by"
1090
" signal %d\n", WTERMSIG(status));
1091
return false;
1092
}
1093
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1094
return false;
1095
}
1096
1097
__attribute__((nonnull, warn_unused_result))
1098
static bool add_local_route(const char *address,
1099
AvahiIfIndex if_index){
1100
if(debug){
1101
fprintf_plus(stderr, "Adding route to %s\n", address);
1102
}
1103
return add_delete_local_route(true, address, if_index);
1104
}
1105
1106
__attribute__((nonnull, warn_unused_result))
1107
static bool delete_local_route(const char *address,
1108
AvahiIfIndex if_index){
1109
if(debug){
1110
fprintf_plus(stderr, "Removing route to %s\n", address);
1111
}
1112
return add_delete_local_route(false, address, if_index);
1113
}
1114
619
1115
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
1116
__attribute__((nonnull, warn_unused_result))
1117
static int start_mandos_communication(const char *ip, in_port_t port,
621
1118
AvahiIfIndex if_index,
622
int af){
1119
int af, mandos_context *mc){
623
1120
int ret, tcp_sd = -1;
624
1121
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
1122
struct sockaddr_storage to;
629
1123
char *buffer = NULL;
630
1124
char *decrypted_buffer = NULL;
631
1125
size_t buffer_length = 0;
634
1128
int retval = -1;
635
1129
gnutls_session_t session;
636
1130
int pf; /* Protocol family */
1131
bool route_added = false;
637
1132
638
1133
errno = 0;
639
1134
655
1150
return -1;
656
1151
}
657
1152
658
ret = init_gnutls_session(&session);
1153
/* If the interface is specified and we have a list of interfaces */
1154
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1155
/* Check if the interface is one of the interfaces we are using */
1156
bool match = false;
1157
{
1158
char *interface = NULL;
1159
while((interface = argz_next(mc->interfaces,
1160
mc->interfaces_size,
1161
interface))){
1162
if(if_nametoindex(interface) == (unsigned int)if_index){
1163
match = true;
1164
break;
1165
}
1166
}
1167
}
1168
if(not match){
1169
/* This interface does not match any in the list, so we don't
1170
connect to the server */
1171
if(debug){
1172
char interface[IF_NAMESIZE];
1173
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1174
perror_plus("if_indextoname");
1175
} else {
1176
fprintf_plus(stderr, "Skipping server on non-used interface"
1177
" \"%s\"\n",
1178
if_indextoname((unsigned int)if_index,
1179
interface));
1180
}
1181
}
1182
return -1;
1183
}
1184
}
1185
1186
ret = init_gnutls_session(&session, mc);
659
1187
if(ret != 0){
660
1188
return -1;
661
1189
}
662
1190
663
1191
if(debug){
664
1192
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
1193
PRIuMAX "\n", ip, (uintmax_t)port);
666
1194
}
667
1195
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
1196
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
669
1197
if(tcp_sd < 0){
670
1198
int e = errno;
671
1199
perror_plus("socket");
678
1206
goto mandos_end;
679
1207
}
680
1208
681
memset(&to, 0, sizeof(to));
682
1209
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1210
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1211
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1212
ret = inet_pton(af, ip, &to6->sin6_addr);
685
1213
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
1214
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1215
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1216
ret = inet_pton(af, ip, &to4->sin_addr);
688
1217
}
689
1218
if(ret < 0 ){
690
1219
int e = errno;
699
1228
goto mandos_end;
700
1229
}
701
1230
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
1231
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1232
if(IN6_IS_ADDR_LINKLOCAL
1233
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
709
1234
if(if_index == AVAHI_IF_UNSPEC){
710
1235
fprintf_plus(stderr, "An IPv6 link-local address is"
711
1236
" incomplete without a network interface\n");
713
1238
goto mandos_end;
714
1239
}
715
1240
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
1241
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
1242
}
718
1243
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
1244
((struct sockaddr_in *)&to)->sin_port = htons(port);
722
1245
}
723
1246
724
1247
if(quit_now){
732
1255
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
1256
perror_plus("if_indextoname");
734
1257
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1258
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1259
"\n", ip, interface, (uintmax_t)port);
737
1260
}
738
1261
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
1262
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1263
ip, (uintmax_t)port);
741
1264
}
742
1265
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
1266
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
748
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
751
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
758
}
759
}
760
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
765
766
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
768
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
}
771
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
777
goto mandos_end;
778
}
779
780
if(quit_now){
781
errno = EINTR;
782
goto mandos_end;
1267
if(af == AF_INET6){
1268
ret = getnameinfo((struct sockaddr *)&to,
1269
sizeof(struct sockaddr_in6),
1270
addrstr, sizeof(addrstr), NULL, 0,
1271
NI_NUMERICHOST);
1272
} else {
1273
ret = getnameinfo((struct sockaddr *)&to,
1274
sizeof(struct sockaddr_in),
1275
addrstr, sizeof(addrstr), NULL, 0,
1276
NI_NUMERICHOST);
1277
}
1278
if(ret == EAI_SYSTEM){
1279
perror_plus("getnameinfo");
1280
} else if(ret != 0) {
1281
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1282
} else if(strcmp(addrstr, ip) != 0){
1283
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1284
}
1285
}
1286
1287
if(quit_now){
1288
errno = EINTR;
1289
goto mandos_end;
1290
}
1291
1292
while(true){
1293
if(af == AF_INET6){
1294
ret = connect(tcp_sd, (struct sockaddr *)&to,
1295
sizeof(struct sockaddr_in6));
1296
} else {
1297
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1298
sizeof(struct sockaddr_in));
1299
}
1300
if(ret < 0){
1301
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1302
and if_index != AVAHI_IF_UNSPEC
1303
and connect_to == NULL
1304
and not route_added and
1305
((af == AF_INET6 and not
1306
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1307
&to)->sin6_addr)))
1308
or (af == AF_INET and
1309
/* Not a a IPv4LL address */
1310
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1311
& 0xFFFF0000L) != 0xA9FE0000L))){
1312
/* Work around Avahi bug - Avahi does not announce link-local
1313
addresses if it has a global address, so local hosts with
1314
*only* a link-local address (e.g. Mandos clients) cannot
1315
connect to a Mandos server announced by Avahi on a server
1316
host with a global address. Work around this by retrying
1317
with an explicit route added with the server's address.
1318
1319
Avahi bug reference:
1320
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1321
https://bugs.debian.org/587961
1322
*/
1323
if(debug){
1324
fprintf_plus(stderr, "Mandos server unreachable, trying"
1325
" direct route\n");
1326
}
1327
int e = errno;
1328
route_added = add_local_route(ip, if_index);
1329
if(route_added){
1330
continue;
1331
}
1332
errno = e;
1333
}
1334
if(errno != ECONNREFUSED or debug){
1335
int e = errno;
1336
perror_plus("connect");
1337
errno = e;
1338
}
1339
goto mandos_end;
1340
}
1341
1342
if(quit_now){
1343
errno = EINTR;
1344
goto mandos_end;
1345
}
1346
break;
783
1347
}
784
1348
785
1349
const char *out = mandos_protocol_version;
821
1385
goto mandos_end;
822
1386
}
823
1387
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1388
/* This casting via intptr_t is to eliminate warning about casting
1389
an int to a pointer type. This is exactly how the GnuTLS Guile
1390
function "set-session-transport-fd!" does it. */
1391
gnutls_transport_set_ptr(session,
1392
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
826
1393
827
1394
if(quit_now){
828
1395
errno = EINTR;
933
1500
if(buffer_length > 0){
934
1501
ssize_t decrypted_buffer_size;
935
1502
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
1503
&decrypted_buffer, mc);
937
1504
if(decrypted_buffer_size >= 0){
938
1505
1506
clearerr(stdout);
939
1507
written = 0;
940
1508
while(written < (size_t) decrypted_buffer_size){
941
1509
if(quit_now){
957
1525
}
958
1526
written += (size_t)ret;
959
1527
}
1528
ret = fflush(stdout);
1529
if(ret != 0){
1530
int e = errno;
1531
if(debug){
1532
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1533
strerror(errno));
1534
}
1535
errno = e;
1536
goto mandos_end;
1537
}
960
1538
retval = 0;
961
1539
}
962
1540
}
965
1543
966
1544
mandos_end:
967
1545
{
1546
if(route_added){
1547
if(not delete_local_route(ip, if_index)){
1548
fprintf_plus(stderr, "Failed to delete local route to %s on"
1549
" interface %d", ip, if_index);
1550
}
1551
}
968
1552
int e = errno;
969
1553
free(decrypted_buffer);
970
1554
free(buffer);
971
1555
if(tcp_sd >= 0){
972
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1556
ret = close(tcp_sd);
973
1557
}
974
1558
if(ret == -1){
975
1559
if(e == 0){
1000
1584
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
1585
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
1586
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1587
void *mc){
1588
if(r == NULL){
1589
return;
1590
}
1005
1591
1006
1592
/* Called whenever a service has been resolved successfully or
1007
1593
timed out */
1008
1594
1009
1595
if(quit_now){
1596
avahi_s_service_resolver_free(r);
1010
1597
return;
1011
1598
}
1012
1599
1016
1603
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
1604
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
1605
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
1606
avahi_strerror(avahi_server_errno
1607
(((mandos_context*)mc)->server)));
1020
1608
break;
1021
1609
1022
1610
case AVAHI_RESOLVER_FOUND:
1028
1616
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
1617
host_name, ip, (intmax_t)interface, port);
1030
1618
}
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1619
int ret = start_mandos_communication(ip, (in_port_t)port,
1620
interface,
1621
avahi_proto_to_af(proto),
1622
mc);
1033
1623
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1624
avahi_simple_poll_quit(simple_poll);
1035
1625
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1626
if(not add_server(ip, (in_port_t)port, interface,
1627
avahi_proto_to_af(proto),
1628
&((mandos_context*)mc)->current_server)){
1038
1629
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
1630
" list\n", name);
1040
1631
}
1053
1644
const char *domain,
1054
1645
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
1646
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1647
void *mc){
1648
if(b == NULL){
1649
return;
1650
}
1058
1651
1059
1652
/* Called whenever a new services becomes available on the LAN or
1060
1653
is removed from the LAN */
1068
1661
case AVAHI_BROWSER_FAILURE:
1069
1662
1070
1663
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1664
avahi_strerror(avahi_server_errno
1665
(((mandos_context*)mc)->server)));
1666
avahi_simple_poll_quit(simple_poll);
1073
1667
return;
1074
1668
1075
1669
case AVAHI_BROWSER_NEW:
1078
1672
the callback function is called the Avahi server will free the
1079
1673
resolver for us. */
1080
1674
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1675
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1676
interface, protocol, name, type,
1677
domain, protocol, 0,
1678
resolve_callback, mc) == NULL)
1084
1679
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
1680
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1681
avahi_strerror(avahi_server_errno
1682
(((mandos_context*)mc)->server)));
1087
1683
break;
1088
1684
1089
1685
case AVAHI_BROWSER_REMOVE:
1108
1704
signal_received = sig;
1109
1705
int old_errno = errno;
1110
1706
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1707
if(simple_poll != NULL){
1708
avahi_simple_poll_quit(simple_poll);
1113
1709
}
1114
1710
errno = old_errno;
1115
1711
}
1116
1712
1713
__attribute__((nonnull, warn_unused_result))
1117
1714
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
1715
int ret;
1716
int old_errno;
1119
1717
1120
1718
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
1719
if(s < 0){
1720
old_errno = errno;
1122
1721
perror_plus("socket");
1722
errno = old_errno;
1123
1723
return false;
1124
1724
}
1125
strcpy(ifr->ifr_name, ifname);
1725
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1726
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1126
1727
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
1728
if(ret == -1){
1128
1729
if(debug){
1730
old_errno = errno;
1129
1731
perror_plus("ioctl SIOCGIFFLAGS");
1732
errno = old_errno;
1733
}
1734
if((close(s) == -1) and debug){
1735
old_errno = errno;
1736
perror_plus("close");
1737
errno = old_errno;
1130
1738
}
1131
1739
return false;
1132
1740
}
1741
if((close(s) == -1) and debug){
1742
old_errno = errno;
1743
perror_plus("close");
1744
errno = old_errno;
1745
}
1133
1746
return true;
1134
1747
}
1135
1748
1749
__attribute__((nonnull, warn_unused_result))
1136
1750
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1751
1138
1752
/* Reject the loopback device */
1180
1794
* corresponds to an acceptable network device.
1181
1795
* (This function is passed to scandir(3) as a filter function.)
1182
1796
*/
1797
__attribute__((nonnull, warn_unused_result))
1183
1798
int good_interface(const struct dirent *if_entry){
1184
1799
if(if_entry->d_name[0] == '.'){
1185
1800
return 0;
1201
1816
}
1202
1817
1203
1818
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1819
* This function determines if a network interface is up.
1820
*/
1821
__attribute__((nonnull, warn_unused_result))
1822
bool interface_is_up(const char *interface){
1823
struct ifreq ifr;
1824
if(not get_flags(interface, &ifr)){
1825
if(debug){
1826
fprintf_plus(stderr, "Failed to get flags for interface "
1827
"\"%s\"\n", interface);
1828
}
1829
return false;
1830
}
1831
1832
return (bool)(ifr.ifr_flags & IFF_UP);
1833
}
1834
1835
/*
1836
* This function determines if a network interface is running
1837
*/
1838
__attribute__((nonnull, warn_unused_result))
1839
bool interface_is_running(const char *interface){
1840
struct ifreq ifr;
1841
if(not get_flags(interface, &ifr)){
1842
if(debug){
1843
fprintf_plus(stderr, "Failed to get flags for interface "
1844
"\"%s\"\n", interface);
1845
}
1846
return false;
1847
}
1848
1849
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1850
}
1851
1852
__attribute__((nonnull, pure, warn_unused_result))
1246
1853
int notdotentries(const struct dirent *direntry){
1247
1854
/* Skip "." and ".." */
1248
1855
if(direntry->d_name[0] == '.'
1255
1862
}
1256
1863
1257
1864
/* Is this directory entry a runnable program? */
1865
__attribute__((nonnull, warn_unused_result))
1258
1866
int runnable_hook(const struct dirent *direntry){
1259
1867
int ret;
1260
1868
size_t sret;
1268
1876
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
1877
"abcdefghijklmnopqrstuvwxyz"
1270
1878
"0123456789"
1271
"_-");
1879
"_.-");
1272
1880
if((direntry->d_name)[sret] != '\0'){
1273
1881
/* Contains non-allowed characters */
1274
1882
if(debug){
1278
1886
return 0;
1279
1887
}
1280
1888
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1889
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1289
1890
if(ret == -1){
1290
1891
if(debug){
1291
1892
perror_plus("Could not stat hook");
1315
1916
return 1;
1316
1917
}
1317
1918
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1919
__attribute__((nonnull, warn_unused_result))
1920
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1921
mandos_context *mc){
1319
1922
int ret;
1320
1923
struct timespec now;
1321
1924
struct timespec waited_time;
1322
1925
intmax_t block_time;
1323
1926
1324
1927
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1928
if(mc->current_server == NULL){
1929
if(debug){
1327
1930
fprintf_plus(stderr, "Wait until first server is found."
1328
1931
" No timeout!\n");
1329
1932
}
1330
1933
ret = avahi_simple_poll_iterate(s, -1);
1331
1934
} else {
1332
if (debug){
1935
if(debug){
1333
1936
fprintf_plus(stderr, "Check current_server if we should run"
1334
1937
" it, or wait\n");
1335
1938
}
1342
1945
/* Calculating in ms how long time between now and server
1343
1946
who we visted longest time ago. Now - last seen. */
1344
1947
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1948
- mc->current_server->last_seen.tv_sec);
1346
1949
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1950
- mc->current_server->last_seen.tv_nsec);
1348
1951
/* total time is 10s/10,000ms.
1349
1952
Converting to s from ms by dividing by 1,000,
1350
1953
and ns to ms by dividing by 1,000,000. */
1352
1955
- ((intmax_t)waited_time.tv_sec * 1000))
1353
1956
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1957
1355
if (debug){
1958
if(debug){
1356
1959
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
1960
block_time);
1358
1961
}
1359
1962
1360
1963
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1964
ret = start_mandos_communication(mc->current_server->ip,
1965
mc->current_server->port,
1966
mc->current_server->if_index,
1967
mc->current_server->af, mc);
1365
1968
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1969
avahi_simple_poll_quit(s);
1367
1970
return 0;
1368
1971
}
1369
1972
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1973
&mc->current_server->last_seen);
1371
1974
if(ret == -1){
1372
1975
perror_plus("clock_gettime");
1373
1976
return -1;
1374
1977
}
1375
mc.current_server = mc.current_server->next;
1978
mc->current_server = mc->current_server->next;
1376
1979
block_time = 0; /* Call avahi to find new Mandos
1377
1980
servers, but don't block */
1378
1981
}
1380
1983
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
1984
}
1382
1985
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1986
if(ret > 0 or errno != EINTR){
1384
1987
return (ret != 1) ? ret : 0;
1385
1988
}
1386
1989
}
1387
1990
}
1388
1991
}
1389
1992
1390
bool run_network_hooks(const char *mode, const char *interface,
1993
__attribute__((nonnull))
1994
void run_network_hooks(const char *mode, const char *interface,
1391
1995
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1996
struct dirent **direntries = NULL;
1997
if(hookdir_fd == -1){
1998
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1999
| O_CLOEXEC);
2000
if(hookdir_fd == -1){
2001
if(errno == ENOENT){
2002
if(debug){
2003
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2004
" found\n", hookdir);
2005
}
2006
} else {
2007
perror_plus("open");
2008
}
2009
return;
2010
}
2011
}
2012
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2013
if(devnull == -1){
2014
perror_plus("open(\"/dev/null\", O_RDONLY)");
2015
return;
2016
}
2017
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2018
runnable_hook, alphasort);
1397
2019
if(numhooks == -1){
1398
2020
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
2021
close(devnull);
2022
return;
2023
}
2024
struct dirent *direntry;
2025
int ret;
2026
for(int i = 0; i < numhooks; i++){
2027
direntry = direntries[i];
2028
if(debug){
2029
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2030
direntry->d_name);
2031
}
2032
pid_t hook_pid = fork();
2033
if(hook_pid == 0){
2034
/* Child */
2035
/* Raise privileges */
2036
errno = raise_privileges_permanently();
2037
if(errno != 0){
2038
perror_plus("Failed to raise privileges");
2039
_exit(EX_NOPERM);
2040
}
2041
/* Set group */
2042
errno = 0;
2043
ret = setgid(0);
2044
if(ret == -1){
2045
perror_plus("setgid");
2046
_exit(EX_NOPERM);
2047
}
2048
/* Reset supplementary groups */
2049
errno = 0;
2050
ret = setgroups(0, NULL);
2051
if(ret == -1){
2052
perror_plus("setgroups");
2053
_exit(EX_NOPERM);
2054
}
2055
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2056
if(ret == -1){
2057
perror_plus("setenv");
2058
_exit(EX_OSERR);
2059
}
2060
ret = setenv("DEVICE", interface, 1);
2061
if(ret == -1){
2062
perror_plus("setenv");
2063
_exit(EX_OSERR);
2064
}
2065
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2066
if(ret == -1){
2067
perror_plus("setenv");
2068
_exit(EX_OSERR);
2069
}
2070
ret = setenv("MODE", mode, 1);
2071
if(ret == -1){
2072
perror_plus("setenv");
2073
_exit(EX_OSERR);
2074
}
2075
char *delaystring;
2076
ret = asprintf(&delaystring, "%f", (double)delay);
2077
if(ret == -1){
1406
2078
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
2079
_exit(EX_OSERR);
2080
}
2081
ret = setenv("DELAY", delaystring, 1);
2082
if(ret == -1){
1475
2083
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
2084
perror_plus("setenv");
2085
_exit(EX_OSERR);
2086
}
2087
free(delaystring);
2088
if(connect_to != NULL){
2089
ret = setenv("CONNECT", connect_to, 1);
2090
if(ret == -1){
2091
perror_plus("setenv");
2092
_exit(EX_OSERR);
2093
}
2094
}
2095
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2096
direntry->d_name,
2097
O_RDONLY));
2098
if(hook_fd == -1){
2099
perror_plus("openat");
2100
_exit(EXIT_FAILURE);
2101
}
2102
if(close(hookdir_fd) == -1){
2103
perror_plus("close");
2104
_exit(EXIT_FAILURE);
2105
}
2106
ret = dup2(devnull, STDIN_FILENO);
2107
if(ret == -1){
2108
perror_plus("dup2(devnull, STDIN_FILENO)");
2109
_exit(EX_OSERR);
2110
}
2111
ret = close(devnull);
2112
if(ret == -1){
2113
perror_plus("close");
2114
_exit(EX_OSERR);
2115
}
2116
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2117
if(ret == -1){
2118
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2119
_exit(EX_OSERR);
2120
}
2121
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2122
environ) == -1){
2123
perror_plus("fexecve");
2124
_exit(EXIT_FAILURE);
2125
}
2126
} else {
2127
if(hook_pid == -1){
2128
perror_plus("fork");
2129
free(direntry);
2130
continue;
2131
}
2132
int status;
2133
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2134
perror_plus("waitpid");
2135
free(direntry);
2136
continue;
2137
}
2138
if(WIFEXITED(status)){
2139
if(WEXITSTATUS(status) != 0){
2140
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2141
" with status %d\n", direntry->d_name,
2142
WEXITSTATUS(status));
2143
free(direntry);
2144
continue;
2145
}
2146
} else if(WIFSIGNALED(status)){
2147
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2148
" signal %d\n", direntry->d_name,
2149
WTERMSIG(status));
2150
free(direntry);
2151
continue;
2152
} else {
2153
fprintf_plus(stderr, "Warning: network hook \"%s\""
2154
" crashed\n", direntry->d_name);
2155
free(direntry);
2156
continue;
2157
}
2158
}
2159
if(debug){
2160
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2161
direntry->d_name);
2162
}
2163
free(direntry);
2164
}
2165
free(direntries);
2166
if(close(hookdir_fd) == -1){
2167
perror_plus("close");
2168
} else {
2169
hookdir_fd = -1;
2170
}
2171
close(devnull);
2172
}
2173
2174
__attribute__((nonnull, warn_unused_result))
2175
int bring_up_interface(const char *const interface,
2176
const float delay){
2177
int old_errno = errno;
2178
int ret;
2179
struct ifreq network;
2180
unsigned int if_index = if_nametoindex(interface);
2181
if(if_index == 0){
2182
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2183
errno = old_errno;
2184
return ENXIO;
2185
}
2186
2187
if(quit_now){
2188
errno = old_errno;
2189
return EINTR;
2190
}
2191
2192
if(not interface_is_up(interface)){
2193
int ret_errno = 0;
2194
int ioctl_errno = 0;
2195
if(not get_flags(interface, &network)){
2196
ret_errno = errno;
2197
fprintf_plus(stderr, "Failed to get flags for interface "
2198
"\"%s\"\n", interface);
2199
errno = old_errno;
2200
return ret_errno;
2201
}
2202
network.ifr_flags |= IFF_UP; /* set flag */
2203
2204
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2205
if(sd == -1){
2206
ret_errno = errno;
2207
perror_plus("socket");
2208
errno = old_errno;
2209
return ret_errno;
2210
}
2211
2212
if(quit_now){
2213
ret = close(sd);
2214
if(ret == -1){
2215
perror_plus("close");
2216
}
2217
errno = old_errno;
2218
return EINTR;
2219
}
2220
2221
if(debug){
2222
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2223
interface);
2224
}
2225
2226
/* Raise privileges */
2227
ret_errno = raise_privileges();
2228
if(ret_errno != 0){
2229
errno = ret_errno;
2230
perror_plus("Failed to raise privileges");
2231
}
2232
2233
#ifdef __linux__
2234
int ret_linux;
2235
bool restore_loglevel = false;
2236
if(ret_errno == 0){
2237
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2238
messages about the network interface to mess up the prompt */
2239
ret_linux = klogctl(8, NULL, 5);
2240
if(ret_linux == -1){
2241
perror_plus("klogctl");
2242
} else {
2243
restore_loglevel = true;
2244
}
2245
}
2246
#endif /* __linux__ */
2247
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2248
ioctl_errno = errno;
2249
#ifdef __linux__
2250
if(restore_loglevel){
2251
ret_linux = klogctl(7, NULL, 0);
2252
if(ret_linux == -1){
2253
perror_plus("klogctl");
2254
}
2255
}
2256
#endif /* __linux__ */
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
2267
2268
/* Close the socket */
2269
ret = close(sd);
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2277
errno = old_errno;
2278
return ioctl_errno;
2279
}
2280
} else if(debug){
2281
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2282
interface);
2283
}
2284
2285
/* Sleep checking until interface is running.
2286
Check every 0.25s, up to total time of delay */
2287
for(int i = 0; i < delay * 4; i++){
2288
if(interface_is_running(interface)){
2289
break;
2290
}
2291
struct timespec sleeptime = { .tv_nsec = 250000000 };
2292
ret = nanosleep(&sleeptime, NULL);
2293
if(ret == -1 and errno != EINTR){
2294
perror_plus("nanosleep");
2295
}
2296
}
2297
2298
errno = old_errno;
2299
return 0;
2300
}
2301
2302
__attribute__((nonnull, warn_unused_result))
2303
int take_down_interface(const char *const interface){
2304
int old_errno = errno;
2305
struct ifreq network;
2306
unsigned int if_index = if_nametoindex(interface);
2307
if(if_index == 0){
2308
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2309
errno = old_errno;
2310
return ENXIO;
2311
}
2312
if(interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
2315
if(not get_flags(interface, &network) and debug){
2316
ret_errno = errno;
2317
fprintf_plus(stderr, "Failed to get flags for interface "
2318
"\"%s\"\n", interface);
2319
errno = old_errno;
2320
return ret_errno;
2321
}
2322
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2323
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2325
if(sd == -1){
2326
ret_errno = errno;
2327
perror_plus("socket");
2328
errno = old_errno;
2329
return ret_errno;
2330
}
2331
2332
if(debug){
2333
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2334
interface);
2335
}
2336
2337
/* Raise privileges */
2338
ret_errno = raise_privileges();
2339
if(ret_errno != 0){
2340
errno = ret_errno;
2341
perror_plus("Failed to raise privileges");
2342
}
2343
2344
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2345
ioctl_errno = errno;
2346
2347
/* If raise_privileges() succeeded above */
2348
if(ret_errno == 0){
2349
/* Lower privileges */
2350
ret_errno = lower_privileges();
2351
if(ret_errno != 0){
2352
errno = ret_errno;
2353
perror_plus("Failed to lower privileges");
2354
}
2355
}
2356
2357
/* Close the socket */
2358
int ret = close(sd);
2359
if(ret == -1){
2360
perror_plus("close");
2361
}
2362
2363
if(ret_setflags == -1){
2364
errno = ioctl_errno;
2365
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2366
errno = old_errno;
2367
return ioctl_errno;
2368
}
2369
} else if(debug){
2370
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2371
interface);
2372
}
2373
2374
errno = old_errno;
2375
return 0;
1524
2376
}
1525
2377
1526
2378
int main(int argc, char *argv[]){
2379
mandos_context mc = { .server = NULL, .dh_bits = 0,
2380
.priority = "SECURE256:!CTYPE-X.509"
2381
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2382
.current_server = NULL, .interfaces = NULL,
2383
.interfaces_size = 0 };
1527
2384
AvahiSServiceBrowser *sb = NULL;
1528
int error;
2385
error_t ret_errno;
1529
2386
int ret;
1530
2387
intmax_t tmpmax;
1531
2388
char *tmp;
1532
2389
int exitcode = EXIT_SUCCESS;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
2390
char *interfaces_to_take_down = NULL;
2391
size_t interfaces_to_take_down_size = 0;
2392
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2393
char old_tempdir[] = "/tmp/mandosXXXXXX";
2394
char *tempdir = NULL;
1541
2395
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
2396
const char *seckey = PATHDIR "/" SECKEY;
1543
2397
const char *pubkey = PATHDIR "/" PUBKEY;
2398
const char *dh_params_file = NULL;
2399
char *interfaces_hooks = NULL;
1544
2400
1545
2401
bool gnutls_initialized = false;
1546
2402
bool gpgme_initialized = false;
1598
2454
.doc = "Bit length of the prime number used in the"
1599
2455
" Diffie-Hellman key exchange",
1600
2456
.group = 2 },
2457
{ .name = "dh-params", .key = 134,
2458
.arg = "FILE",
2459
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2460
" for the Diffie-Hellman key exchange",
2461
.group = 2 },
1601
2462
{ .name = "priority", .key = 130,
1602
2463
.arg = "STRING",
1603
2464
.doc = "GnuTLS priority string for the TLS handshake",
1637
2498
connect_to = arg;
1638
2499
break;
1639
2500
case 'i': /* --interface */
1640
interface = arg;
2501
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2502
arg, (int)',');
2503
if(ret_errno != 0){
2504
argp_error(state, "%s", strerror(ret_errno));
2505
}
1641
2506
break;
1642
2507
case 's': /* --seckey */
1643
2508
seckey = arg;
1654
2519
}
1655
2520
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1656
2521
break;
2522
case 134: /* --dh-params */
2523
dh_params_file = arg;
2524
break;
1657
2525
case 130: /* --priority */
1658
2526
mc.priority = arg;
1659
2527
break;
1699
2567
.args_doc = "",
1700
2568
.doc = "Mandos client -- Get and decrypt"
1701
2569
" passwords from a Mandos server" };
1702
ret = argp_parse(&argp, argc, argv,
1703
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1704
switch(ret){
2570
ret_errno = argp_parse(&argp, argc, argv,
2571
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2572
switch(ret_errno){
1705
2573
case 0:
1706
2574
break;
1707
2575
case ENOMEM:
1708
2576
default:
1709
errno = ret;
2577
errno = ret_errno;
1710
2578
perror_plus("argp_parse");
1711
2579
exitcode = EX_OSERR;
1712
2580
goto end;
1715
2583
goto end;
1716
2584
}
1717
2585
}
1718
2586
1719
2587
{
1720
2588
/* Work around Debian bug #633582:
1721
<http://bugs.debian.org/633582> */
2589
<https://bugs.debian.org/633582> */
1722
2590
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
2591
/* Re-raise privileges */
2592
ret = raise_privileges();
2593
if(ret != 0){
2594
errno = ret;
2595
perror_plus("Failed to raise privileges");
1728
2596
} else {
1729
2597
struct stat st;
1730
2598
1745
2613
}
1746
2614
}
1747
2615
}
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
2616
close(seckey_fd);
1749
2617
}
1750
2618
}
1751
2619
1752
2620
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
2621
int pubkey_fd = open(pubkey, O_RDONLY);
1754
2622
if(pubkey_fd == -1){
1766
2634
}
1767
2635
}
1768
2636
}
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
2637
close(pubkey_fd);
2638
}
2639
}
2640
2641
if(dh_params_file != NULL
2642
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2643
int dhparams_fd = open(dh_params_file, O_RDONLY);
2644
if(dhparams_fd == -1){
2645
perror_plus("open");
2646
} else {
2647
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2648
if(ret == -1){
2649
perror_plus("fstat");
2650
} else {
2651
if(S_ISREG(st.st_mode)
2652
and st.st_uid == 0 and st.st_gid == 0){
2653
ret = fchown(dhparams_fd, uid, gid);
2654
if(ret == -1){
2655
perror_plus("fchown");
2656
}
2657
}
2658
}
2659
close(dhparams_fd);
2660
}
2661
}
2662
1773
2663
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
2664
ret = lower_privileges();
2665
if(ret != 0){
2666
errno = ret;
2667
perror_plus("Failed to lower privileges");
2668
}
2669
}
2670
}
2671
2672
/* Remove invalid interface names (except "none") */
2673
{
2674
char *interface = NULL;
2675
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2676
interface))){
2677
if(strcmp(interface, "none") != 0
2678
and if_nametoindex(interface) == 0){
2679
if(interface[0] != '\0'){
2680
fprintf_plus(stderr, "Not using nonexisting interface"
2681
" \"%s\"\n", interface);
2682
}
2683
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2684
interface = NULL;
1778
2685
}
1779
2686
}
1780
2687
}
1781
2688
1782
2689
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2690
{
2691
if(mc.interfaces != NULL){
2692
interfaces_hooks = malloc(mc.interfaces_size);
2693
if(interfaces_hooks == NULL){
2694
perror_plus("malloc");
2695
goto end;
2696
}
2697
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2698
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2699
}
2700
run_network_hooks("start", interfaces_hooks != NULL ?
2701
interfaces_hooks : "", delay);
1785
2702
}
1786
2703
1787
2704
if(not debug){
1788
2705
avahi_set_log_function(empty_log);
1789
2706
}
1790
2707
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
1823
2708
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
2709
from the signal handler */
1825
2710
/* Initialize the pseudo-RNG for Avahi */
1826
2711
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2712
simple_poll = avahi_simple_poll_new();
2713
if(simple_poll == NULL){
1829
2714
fprintf_plus(stderr,
1830
2715
"Avahi: Failed to create simple poll object.\n");
1831
2716
exitcode = EX_UNAVAILABLE;
1895
2780
}
1896
2781
}
1897
2782
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
2783
/* If no interfaces were specified, make a list */
2784
if(mc.interfaces == NULL){
2785
struct dirent **direntries = NULL;
2786
/* Look for any good interfaces */
2787
ret = scandir(sys_class_net, &direntries, good_interface,
2788
alphasort);
2789
if(ret >= 1){
2790
/* Add all found interfaces to interfaces list */
2791
for(int i = 0; i < ret; ++i){
2792
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2793
direntries[i]->d_name);
2794
if(ret_errno != 0){
2795
errno = ret_errno;
2796
perror_plus("argz_add");
2797
free(direntries[i]);
2798
continue;
2799
}
2800
if(debug){
2801
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2802
direntries[i]->d_name);
2803
}
2804
free(direntries[i]);
2805
}
2806
free(direntries);
2807
} else {
2808
if(ret == 0){
2809
free(direntries);
2810
}
2811
fprintf_plus(stderr, "Could not find a network interface\n");
2812
exitcode = EXIT_FAILURE;
2813
goto end;
2814
}
2815
}
2816
2817
/* Bring up interfaces which are down, and remove any "none"s */
2818
{
2819
char *interface = NULL;
2820
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2821
interface))){
2822
/* If interface name is "none", stop bringing up interfaces.
2823
Also remove all instances of "none" from the list */
2824
if(strcmp(interface, "none") == 0){
2825
argz_delete(&mc.interfaces, &mc.interfaces_size,
2826
interface);
2827
interface = NULL;
2828
while((interface = argz_next(mc.interfaces,
2829
mc.interfaces_size, interface))){
2830
if(strcmp(interface, "none") == 0){
2831
argz_delete(&mc.interfaces, &mc.interfaces_size,
2832
interface);
2833
interface = NULL;
1983
2834
}
1984
2835
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2002
2836
break;
2003
2837
}
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
2838
bool interface_was_up = interface_is_up(interface);
2839
errno = bring_up_interface(interface, delay);
2840
if(not interface_was_up){
2841
if(errno != 0){
2842
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2843
" %s\n", interface, strerror(errno));
2844
} else {
2845
errno = argz_add(&interfaces_to_take_down,
2846
&interfaces_to_take_down_size,
2847
interface);
2848
if(errno != 0){
2849
perror_plus("argz_add");
2850
}
2851
}
2852
}
2853
}
2854
if(debug and (interfaces_to_take_down == NULL)){
2855
fprintf_plus(stderr, "No interfaces were brought up\n");
2856
}
2857
}
2858
2859
/* If we only got one interface, explicitly use only that one */
2860
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2861
if(debug){
2862
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2863
mc.interfaces);
2864
}
2865
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2033
2866
}
2034
2867
2035
2868
if(quit_now){
2036
2869
goto end;
2037
2870
}
2038
2871
2039
ret = init_gnutls_global(pubkey, seckey);
2872
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2040
2873
if(ret == -1){
2041
2874
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
2875
exitcode = EX_UNAVAILABLE;
2049
2882
goto end;
2050
2883
}
2051
2884
2052
if(mkdtemp(tempdir) == NULL){
2885
/* Try /run/tmp before /tmp */
2886
tempdir = mkdtemp(run_tempdir);
2887
if(tempdir == NULL and errno == ENOENT){
2888
if(debug){
2889
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2890
run_tempdir, old_tempdir);
2891
}
2892
tempdir = mkdtemp(old_tempdir);
2893
}
2894
if(tempdir == NULL){
2053
2895
perror_plus("mkdtemp");
2054
2896
goto end;
2055
2897
}
2056
tempdir_created = true;
2057
2898
2058
2899
if(quit_now){
2059
2900
goto end;
2060
2901
}
2061
2902
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2903
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2063
2904
fprintf_plus(stderr, "init_gpgme failed\n");
2064
2905
exitcode = EX_UNAVAILABLE;
2065
2906
goto end;
2075
2916
/* Connect directly, do not use Zeroconf */
2076
2917
/* (Mainly meant for debugging) */
2077
2918
char *address = strrchr(connect_to, ':');
2919
2078
2920
if(address == NULL){
2079
2921
fprintf_plus(stderr, "No colon in address\n");
2080
2922
exitcode = EX_USAGE;
2085
2927
goto end;
2086
2928
}
2087
2929
2088
uint16_t port;
2930
in_port_t port;
2089
2931
errno = 0;
2090
2932
tmpmax = strtoimax(address+1, &tmp, 10);
2091
2933
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
or tmpmax != (uint16_t)tmpmax){
2934
or tmpmax != (in_port_t)tmpmax){
2093
2935
fprintf_plus(stderr, "Bad port number\n");
2094
2936
exitcode = EX_USAGE;
2095
2937
goto end;
2096
2938
}
2097
2939
2098
2940
if(quit_now){
2099
2941
goto end;
2100
2942
}
2101
2943
2102
port = (uint16_t)tmpmax;
2944
port = (in_port_t)tmpmax;
2103
2945
*address = '\0';
2104
2946
/* Colon in address indicates IPv6 */
2105
2947
int af;
2121
2963
}
2122
2964
2123
2965
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2966
ret = start_mandos_communication(address, port, if_index, af,
2967
&mc);
2125
2968
if(quit_now or ret == 0){
2126
2969
break;
2127
2970
}
2129
2972
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
2973
(int)retry_interval);
2131
2974
}
2132
sleep((int)retry_interval);
2975
sleep((unsigned int)retry_interval);
2133
2976
}
2134
2977
2135
if (not quit_now){
2978
if(not quit_now){
2136
2979
exitcode = EXIT_SUCCESS;
2137
2980
}
2138
2981
2153
2996
config.publish_domain = 0;
2154
2997
2155
2998
/* Allocate a new server */
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2999
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3000
&config, NULL, NULL, &ret);
2159
3001
2160
3002
/* Free the Avahi configuration data */
2161
3003
avahi_server_config_free(&config);
2164
3006
/* Check if creating the Avahi server object succeeded */
2165
3007
if(mc.server == NULL){
2166
3008
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
3009
avahi_strerror(ret));
2168
3010
exitcode = EX_UNAVAILABLE;
2169
3011
goto end;
2170
3012
}
2176
3018
/* Create the Avahi service browser */
2177
3019
sb = avahi_s_service_browser_new(mc.server, if_index,
2178
3020
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
NULL, 0, browse_callback, NULL);
3021
NULL, 0, browse_callback,
3022
(void *)&mc);
2180
3023
if(sb == NULL){
2181
3024
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
3025
avahi_strerror(avahi_server_errno(mc.server)));
2193
3036
if(debug){
2194
3037
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
3038
}
2196
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
3039
3040
ret = avahi_loop_with_timeout(simple_poll,
3041
(int)(retry_interval * 1000), &mc);
2199
3042
if(debug){
2200
3043
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
3044
(ret == 0) ? "successfully" : "with error");
2204
3047
end:
2205
3048
2206
3049
if(debug){
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3050
if(signal_received){
3051
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3052
argv[0], signal_received,
3053
strsignal(signal_received));
3054
} else {
3055
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3056
}
2208
3057
}
2209
3058
2210
3059
/* Cleanup things */
3060
free(mc.interfaces);
3061
2211
3062
if(sb != NULL)
2212
3063
avahi_s_service_browser_free(sb);
2213
3064
2214
3065
if(mc.server != NULL)
2215
3066
avahi_server_free(mc.server);
2216
3067
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
3068
if(simple_poll != NULL)
3069
avahi_simple_poll_free(simple_poll);
2219
3070
2220
3071
if(gnutls_initialized){
2221
3072
gnutls_certificate_free_credentials(mc.cred);
2222
gnutls_global_deinit();
2223
3073
gnutls_dh_params_deinit(mc.dh_params);
2224
3074
}
2225
3075
2233
3083
mc.current_server->prev->next = NULL;
2234
3084
while(mc.current_server != NULL){
2235
3085
server *next = mc.current_server->next;
3086
#ifdef __GNUC__
3087
#pragma GCC diagnostic push
3088
#pragma GCC diagnostic ignored "-Wcast-qual"
3089
#endif
3090
free((char *)(mc.current_server->ip));
3091
#ifdef __GNUC__
3092
#pragma GCC diagnostic pop
3093
#endif
2236
3094
free(mc.current_server);
2237
3095
mc.current_server = next;
2238
3096
}
2239
3097
}
2240
3098
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
3099
/* Re-raise privileges */
2245
3100
{
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
3101
ret = raise_privileges();
3102
if(ret != 0){
3103
errno = ret;
3104
perror_plus("Failed to raise privileges");
3105
} else {
3106
3107
/* Run network hooks */
3108
run_network_hooks("stop", interfaces_hooks != NULL ?
3109
interfaces_hooks : "", delay);
3110
3111
/* Take down the network interfaces which were brought up */
3112
{
3113
char *interface = NULL;
3114
while((interface = argz_next(interfaces_to_take_down,
3115
interfaces_to_take_down_size,
3116
interface))){
3117
ret = take_down_interface(interface);
3118
if(ret != 0){
3119
errno = ret;
3120
perror_plus("Failed to take down interface");
3121
}
3122
}
3123
if(debug and (interfaces_to_take_down == NULL)){
3124
fprintf_plus(stderr, "No interfaces needed to be taken"
3125
" down\n");
3126
}
3127
}
2250
3128
}
2251
3129
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2262
}
2263
}
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2267
}
3130
ret = lower_privileges_permanently();
3131
if(ret != 0){
3132
errno = ret;
3133
perror_plus("Failed to lower privileges permanently");
2268
3134
}
2269
3135
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
3136
3137
free(interfaces_to_take_down);
3138
free(interfaces_hooks);
3139
3140
void clean_dir_at(int base, const char * const dirname,
3141
uintmax_t level){
3142
struct dirent **direntries = NULL;
3143
int dret;
3144
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3145
O_RDONLY
3146
| O_NOFOLLOW
3147
| O_DIRECTORY
3148
| O_PATH));
3149
if(dir_fd == -1){
3150
perror_plus("open");
3151
return;
3152
}
3153
int numentries = scandirat(dir_fd, ".", &direntries,
3154
notdotentries, alphasort);
3155
if(numentries >= 0){
3156
for(int i = 0; i < numentries; i++){
3157
if(debug){
3158
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3159
dirname, direntries[i]->d_name);
3160
}
3161
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3162
if(dret == -1){
3163
if(errno == EISDIR){
3164
dret = unlinkat(dir_fd, direntries[i]->d_name,
3165
AT_REMOVEDIR);
3166
}
3167
if((dret == -1) and (errno == ENOTEMPTY)
3168
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3169
== 0) and (level == 0)){
3170
/* Recurse only in this special case */
3171
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3172
dret = 0;
3173
}
3174
if((dret == -1) and (errno != ENOENT)){
3175
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3176
direntries[i]->d_name, strerror(errno));
3177
}
3178
}
3179
free(direntries[i]);
3180
}
3181
3182
/* need to clean even if 0 because man page doesn't specify */
3183
free(direntries);
3184
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3185
if(dret == -1 and errno != ENOENT){
3186
perror_plus("rmdir");
3187
}
3188
} else {
3189
perror_plus("scandirat");
3190
}
3191
close(dir_fd);
2275
3192
}
2276
3193
2277
3194
/* Removes the GPGME temp directory and all files inside */
2278
if(tempdir_created){
2279
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
2286
char *fullname = NULL;
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
2288
direntry->d_name);
2289
if(ret < 0){
2290
perror_plus("asprintf");
2291
continue;
2292
}
2293
ret = remove(fullname);
2294
if(ret == -1){
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2297
}
2298
free(fullname);
2299
}
2300
}
2301
2302
/* need to clean even if 0 because man page doesn't specify */
2303
free(direntries);
2304
if (numentries == -1){
2305
perror_plus("scandir");
2306
}
2307
ret = rmdir(tempdir);
2308
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
2310
}
3195
if(tempdir != NULL){
3196
clean_dir_at(-1, tempdir, 0);
2311
3197
}
2312
3198
2313
3199
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0