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- Committer: Teddy Hogeborn
- Date: 2018-04-01 22:08:50 UTC
- Revision ID: teddy@recompile.se-20180401220850-11kc7596lknn4piy
Check for and report GPGME key import errors
* plugins.d/mandos-client.c (init_gpgme/import_key): After
gpgme_op_import(), call gpgme_op_import_result() to see if it
worked. If not, print all available information.
* plugins.d/mandos-client.c (init_gpgme/import_key): After
gpgme_op_import(), call gpgme_op_import_result() to see if it
worked. If not, print all available information.
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
stdout, ferror() */
44
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
}
464
574
return plaintext_length;
465
575
}
466
576
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;
577
__attribute__((warn_unused_result, const))
578
static const char *safe_string(const char *str){
579
if(str == NULL)
580
return "(unknown)";
581
return str;
582
}
583
584
__attribute__((warn_unused_result))
585
static const char *safer_gnutls_strerror(int value){
586
const char *ret = gnutls_strerror(value);
587
return safe_string(ret);
473
588
}
474
589
475
590
/* GnuTLS log function callback */
591
__attribute__((nonnull))
476
592
static void debuggnutls(__attribute__((unused)) int level,
477
593
const char* string){
478
594
fprintf_plus(stderr, "GnuTLS: %s", string);
479
595
}
480
596
597
__attribute__((nonnull(1, 2, 4), warn_unused_result))
481
598
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
599
const char *seckeyfilename,
600
const char *dhparamsfilename,
601
mandos_context *mc){
483
602
int ret;
603
unsigned int uret;
484
604
485
605
if(debug){
486
606
fprintf_plus(stderr, "Initializing GnuTLS\n");
487
607
}
488
608
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
609
if(debug){
497
610
/* "Use a log level over 10 to enable all debugging options."
498
611
* - GnuTLS manual
502
615
}
503
616
504
617
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
618
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
619
if(ret != GNUTLS_E_SUCCESS){
507
620
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
621
safer_gnutls_strerror(ret));
509
gnutls_global_deinit();
510
622
return -1;
511
623
}
512
624
518
630
}
519
631
520
632
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
633
(mc->cred, pubkeyfilename, seckeyfilename,
522
634
GNUTLS_OPENPGP_FMT_BASE64);
523
635
if(ret != GNUTLS_E_SUCCESS){
524
636
fprintf_plus(stderr,
530
642
}
531
643
532
644
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
645
ret = gnutls_dh_params_init(&mc->dh_params);
534
646
if(ret != GNUTLS_E_SUCCESS){
535
647
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
648
" initialization: %s\n",
537
649
safer_gnutls_strerror(ret));
538
650
goto globalfail;
539
651
}
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);
652
/* If a Diffie-Hellman parameters file was given, try to use it */
653
if(dhparamsfilename != NULL){
654
gnutls_datum_t params = { .data = NULL, .size = 0 };
655
do {
656
int dhpfile = open(dhparamsfilename, O_RDONLY);
657
if(dhpfile == -1){
658
perror_plus("open");
659
dhparamsfilename = NULL;
660
break;
661
}
662
size_t params_capacity = 0;
663
while(true){
664
params_capacity = incbuffer((char **)¶ms.data,
665
(size_t)params.size,
666
(size_t)params_capacity);
667
if(params_capacity == 0){
668
perror_plus("incbuffer");
669
free(params.data);
670
params.data = NULL;
671
dhparamsfilename = NULL;
672
break;
673
}
674
ssize_t bytes_read = read(dhpfile,
675
params.data + params.size,
676
BUFFER_SIZE);
677
/* EOF */
678
if(bytes_read == 0){
679
break;
680
}
681
/* check bytes_read for failure */
682
if(bytes_read < 0){
683
perror_plus("read");
684
free(params.data);
685
params.data = NULL;
686
dhparamsfilename = NULL;
687
break;
688
}
689
params.size += (unsigned int)bytes_read;
690
}
691
ret = close(dhpfile);
692
if(ret == -1){
693
perror_plus("close");
694
}
695
if(params.data == NULL){
696
dhparamsfilename = NULL;
697
}
698
if(dhparamsfilename == NULL){
699
break;
700
}
701
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
702
GNUTLS_X509_FMT_PEM);
703
if(ret != GNUTLS_E_SUCCESS){
704
fprintf_plus(stderr, "Failed to parse DH parameters in file"
705
" \"%s\": %s\n", dhparamsfilename,
706
safer_gnutls_strerror(ret));
707
dhparamsfilename = NULL;
708
}
709
free(params.data);
710
} while(false);
711
}
712
if(dhparamsfilename == NULL){
713
if(mc->dh_bits == 0){
714
/* Find out the optimal number of DH bits */
715
/* Try to read the private key file */
716
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
717
do {
718
int secfile = open(seckeyfilename, O_RDONLY);
719
if(secfile == -1){
720
perror_plus("open");
721
break;
722
}
723
size_t buffer_capacity = 0;
724
while(true){
725
buffer_capacity = incbuffer((char **)&buffer.data,
726
(size_t)buffer.size,
727
(size_t)buffer_capacity);
728
if(buffer_capacity == 0){
729
perror_plus("incbuffer");
730
free(buffer.data);
731
buffer.data = NULL;
732
break;
733
}
734
ssize_t bytes_read = read(secfile,
735
buffer.data + buffer.size,
736
BUFFER_SIZE);
737
/* EOF */
738
if(bytes_read == 0){
739
break;
740
}
741
/* check bytes_read for failure */
742
if(bytes_read < 0){
743
perror_plus("read");
744
free(buffer.data);
745
buffer.data = NULL;
746
break;
747
}
748
buffer.size += (unsigned int)bytes_read;
749
}
750
close(secfile);
751
} while(false);
752
/* If successful, use buffer to parse private key */
753
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
754
if(buffer.data != NULL){
755
{
756
gnutls_openpgp_privkey_t privkey = NULL;
757
ret = gnutls_openpgp_privkey_init(&privkey);
758
if(ret != GNUTLS_E_SUCCESS){
759
fprintf_plus(stderr, "Error initializing OpenPGP key"
760
" structure: %s",
761
safer_gnutls_strerror(ret));
762
free(buffer.data);
763
buffer.data = NULL;
764
} else {
765
ret = gnutls_openpgp_privkey_import
766
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
767
if(ret != GNUTLS_E_SUCCESS){
768
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
769
safer_gnutls_strerror(ret));
770
privkey = NULL;
771
}
772
free(buffer.data);
773
buffer.data = NULL;
774
if(privkey != NULL){
775
/* Use private key to suggest an appropriate
776
sec_param */
777
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
778
gnutls_openpgp_privkey_deinit(privkey);
779
if(debug){
780
fprintf_plus(stderr, "This OpenPGP key implies using"
781
" a GnuTLS security parameter \"%s\".\n",
782
safe_string(gnutls_sec_param_get_name
783
(sec_param)));
784
}
785
}
786
}
787
}
788
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
789
/* Err on the side of caution */
790
sec_param = GNUTLS_SEC_PARAM_ULTRA;
791
if(debug){
792
fprintf_plus(stderr, "Falling back to security parameter"
793
" \"%s\"\n",
794
safe_string(gnutls_sec_param_get_name
795
(sec_param)));
796
}
797
}
798
}
799
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
800
if(uret != 0){
801
mc->dh_bits = uret;
802
if(debug){
803
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
804
" implies %u DH bits; using that.\n",
805
safe_string(gnutls_sec_param_get_name
806
(sec_param)),
807
mc->dh_bits);
808
}
809
} else {
810
fprintf_plus(stderr, "Failed to get implied number of DH"
811
" bits for security parameter \"%s\"): %s\n",
812
safe_string(gnutls_sec_param_get_name
813
(sec_param)),
814
safer_gnutls_strerror(ret));
815
goto globalfail;
816
}
817
} else if(debug){
818
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
819
mc->dh_bits);
820
}
821
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
822
if(ret != GNUTLS_E_SUCCESS){
823
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
824
" bits): %s\n", mc->dh_bits,
825
safer_gnutls_strerror(ret));
826
goto globalfail;
827
}
828
}
829
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
830
549
831
return 0;
550
832
551
833
globalfail:
552
834
553
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
835
gnutls_certificate_free_credentials(mc->cred);
836
gnutls_dh_params_deinit(mc->dh_params);
556
837
return -1;
557
838
}
558
839
559
static int init_gnutls_session(gnutls_session_t *session){
840
__attribute__((nonnull, warn_unused_result))
841
static int init_gnutls_session(gnutls_session_t *session,
842
mandos_context *mc){
560
843
int ret;
561
844
/* GnuTLS session creation */
562
845
do {
574
857
{
575
858
const char *err;
576
859
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
860
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
861
if(quit_now){
579
862
gnutls_deinit(*session);
580
863
return -1;
591
874
592
875
do {
593
876
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
877
mc->cred);
595
878
if(quit_now){
596
879
gnutls_deinit(*session);
597
880
return -1;
607
890
/* ignore client certificate if any. */
608
891
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
892
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
611
612
893
return 0;
613
894
}
614
895
616
897
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
898
__attribute__((unused)) const char *txt){}
618
899
900
/* Set effective uid to 0, return errno */
901
__attribute__((warn_unused_result))
902
int raise_privileges(void){
903
int old_errno = errno;
904
int ret = 0;
905
if(seteuid(0) == -1){
906
ret = errno;
907
}
908
errno = old_errno;
909
return ret;
910
}
911
912
/* Set effective and real user ID to 0. Return errno. */
913
__attribute__((warn_unused_result))
914
int raise_privileges_permanently(void){
915
int old_errno = errno;
916
int ret = raise_privileges();
917
if(ret != 0){
918
errno = old_errno;
919
return ret;
920
}
921
if(setuid(0) == -1){
922
ret = errno;
923
}
924
errno = old_errno;
925
return ret;
926
}
927
928
/* Set effective user ID to unprivileged saved user ID */
929
__attribute__((warn_unused_result))
930
int lower_privileges(void){
931
int old_errno = errno;
932
int ret = 0;
933
if(seteuid(uid) == -1){
934
ret = errno;
935
}
936
errno = old_errno;
937
return ret;
938
}
939
940
/* Lower privileges permanently */
941
__attribute__((warn_unused_result))
942
int lower_privileges_permanently(void){
943
int old_errno = errno;
944
int ret = 0;
945
if(setuid(uid) == -1){
946
ret = errno;
947
}
948
errno = old_errno;
949
return ret;
950
}
951
952
/* Helper function to add_local_route() and delete_local_route() */
953
__attribute__((nonnull, warn_unused_result))
954
static bool add_delete_local_route(const bool add,
955
const char *address,
956
AvahiIfIndex if_index){
957
int ret;
958
char helper[] = "mandos-client-iprouteadddel";
959
char add_arg[] = "add";
960
char delete_arg[] = "delete";
961
char debug_flag[] = "--debug";
962
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
963
if(pluginhelperdir == NULL){
964
if(debug){
965
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
966
" variable not set; cannot run helper\n");
967
}
968
return false;
969
}
970
971
char interface[IF_NAMESIZE];
972
if(if_indextoname((unsigned int)if_index, interface) == NULL){
973
perror_plus("if_indextoname");
974
return false;
975
}
976
977
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
978
if(devnull == -1){
979
perror_plus("open(\"/dev/null\", O_RDONLY)");
980
return false;
981
}
982
pid_t pid = fork();
983
if(pid == 0){
984
/* Child */
985
/* Raise privileges */
986
errno = raise_privileges_permanently();
987
if(errno != 0){
988
perror_plus("Failed to raise privileges");
989
/* _exit(EX_NOPERM); */
990
} else {
991
/* Set group */
992
errno = 0;
993
ret = setgid(0);
994
if(ret == -1){
995
perror_plus("setgid");
996
_exit(EX_NOPERM);
997
}
998
/* Reset supplementary groups */
999
errno = 0;
1000
ret = setgroups(0, NULL);
1001
if(ret == -1){
1002
perror_plus("setgroups");
1003
_exit(EX_NOPERM);
1004
}
1005
}
1006
ret = dup2(devnull, STDIN_FILENO);
1007
if(ret == -1){
1008
perror_plus("dup2(devnull, STDIN_FILENO)");
1009
_exit(EX_OSERR);
1010
}
1011
ret = close(devnull);
1012
if(ret == -1){
1013
perror_plus("close");
1014
_exit(EX_OSERR);
1015
}
1016
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1017
if(ret == -1){
1018
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1019
_exit(EX_OSERR);
1020
}
1021
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1022
O_RDONLY
1023
| O_DIRECTORY
1024
| O_PATH
1025
| O_CLOEXEC));
1026
if(helperdir_fd == -1){
1027
perror_plus("open");
1028
_exit(EX_UNAVAILABLE);
1029
}
1030
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1031
helper, O_RDONLY));
1032
if(helper_fd == -1){
1033
perror_plus("openat");
1034
close(helperdir_fd);
1035
_exit(EX_UNAVAILABLE);
1036
}
1037
close(helperdir_fd);
1038
#ifdef __GNUC__
1039
#pragma GCC diagnostic push
1040
#pragma GCC diagnostic ignored "-Wcast-qual"
1041
#endif
1042
if(fexecve(helper_fd, (char *const [])
1043
{ helper, add ? add_arg : delete_arg, (char *)address,
1044
interface, debug ? debug_flag : NULL, NULL },
1045
environ) == -1){
1046
#ifdef __GNUC__
1047
#pragma GCC diagnostic pop
1048
#endif
1049
perror_plus("fexecve");
1050
_exit(EXIT_FAILURE);
1051
}
1052
}
1053
if(pid == -1){
1054
perror_plus("fork");
1055
return false;
1056
}
1057
int status;
1058
pid_t pret = -1;
1059
errno = 0;
1060
do {
1061
pret = waitpid(pid, &status, 0);
1062
if(pret == -1 and errno == EINTR and quit_now){
1063
int errno_raising = 0;
1064
if((errno = raise_privileges()) != 0){
1065
errno_raising = errno;
1066
perror_plus("Failed to raise privileges in order to"
1067
" kill helper program");
1068
}
1069
if(kill(pid, SIGTERM) == -1){
1070
perror_plus("kill");
1071
}
1072
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1073
perror_plus("Failed to lower privileges after killing"
1074
" helper program");
1075
}
1076
return false;
1077
}
1078
} while(pret == -1 and errno == EINTR);
1079
if(pret == -1){
1080
perror_plus("waitpid");
1081
return false;
1082
}
1083
if(WIFEXITED(status)){
1084
if(WEXITSTATUS(status) != 0){
1085
fprintf_plus(stderr, "Error: iprouteadddel exited"
1086
" with status %d\n", WEXITSTATUS(status));
1087
return false;
1088
}
1089
return true;
1090
}
1091
if(WIFSIGNALED(status)){
1092
fprintf_plus(stderr, "Error: iprouteadddel died by"
1093
" signal %d\n", WTERMSIG(status));
1094
return false;
1095
}
1096
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1097
return false;
1098
}
1099
1100
__attribute__((nonnull, warn_unused_result))
1101
static bool add_local_route(const char *address,
1102
AvahiIfIndex if_index){
1103
if(debug){
1104
fprintf_plus(stderr, "Adding route to %s\n", address);
1105
}
1106
return add_delete_local_route(true, address, if_index);
1107
}
1108
1109
__attribute__((nonnull, warn_unused_result))
1110
static bool delete_local_route(const char *address,
1111
AvahiIfIndex if_index){
1112
if(debug){
1113
fprintf_plus(stderr, "Removing route to %s\n", address);
1114
}
1115
return add_delete_local_route(false, address, if_index);
1116
}
1117
619
1118
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
1119
__attribute__((nonnull, warn_unused_result))
1120
static int start_mandos_communication(const char *ip, in_port_t port,
621
1121
AvahiIfIndex if_index,
622
int af){
1122
int af, mandos_context *mc){
623
1123
int ret, tcp_sd = -1;
624
1124
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
1125
struct sockaddr_storage to;
629
1126
char *buffer = NULL;
630
1127
char *decrypted_buffer = NULL;
631
1128
size_t buffer_length = 0;
634
1131
int retval = -1;
635
1132
gnutls_session_t session;
636
1133
int pf; /* Protocol family */
1134
bool route_added = false;
637
1135
638
1136
errno = 0;
639
1137
655
1153
return -1;
656
1154
}
657
1155
658
ret = init_gnutls_session(&session);
1156
/* If the interface is specified and we have a list of interfaces */
1157
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1158
/* Check if the interface is one of the interfaces we are using */
1159
bool match = false;
1160
{
1161
char *interface = NULL;
1162
while((interface = argz_next(mc->interfaces,
1163
mc->interfaces_size,
1164
interface))){
1165
if(if_nametoindex(interface) == (unsigned int)if_index){
1166
match = true;
1167
break;
1168
}
1169
}
1170
}
1171
if(not match){
1172
/* This interface does not match any in the list, so we don't
1173
connect to the server */
1174
if(debug){
1175
char interface[IF_NAMESIZE];
1176
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1177
perror_plus("if_indextoname");
1178
} else {
1179
fprintf_plus(stderr, "Skipping server on non-used interface"
1180
" \"%s\"\n",
1181
if_indextoname((unsigned int)if_index,
1182
interface));
1183
}
1184
}
1185
return -1;
1186
}
1187
}
1188
1189
ret = init_gnutls_session(&session, mc);
659
1190
if(ret != 0){
660
1191
return -1;
661
1192
}
662
1193
663
1194
if(debug){
664
1195
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
1196
PRIuMAX "\n", ip, (uintmax_t)port);
666
1197
}
667
1198
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
1199
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
669
1200
if(tcp_sd < 0){
670
1201
int e = errno;
671
1202
perror_plus("socket");
678
1209
goto mandos_end;
679
1210
}
680
1211
681
memset(&to, 0, sizeof(to));
682
1212
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1213
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1214
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1215
ret = inet_pton(af, ip, &to6->sin6_addr);
685
1216
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
1217
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1218
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1219
ret = inet_pton(af, ip, &to4->sin_addr);
688
1220
}
689
1221
if(ret < 0 ){
690
1222
int e = errno;
699
1231
goto mandos_end;
700
1232
}
701
1233
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*/
1234
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1235
if(IN6_IS_ADDR_LINKLOCAL
1236
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
709
1237
if(if_index == AVAHI_IF_UNSPEC){
710
1238
fprintf_plus(stderr, "An IPv6 link-local address is"
711
1239
" incomplete without a network interface\n");
713
1241
goto mandos_end;
714
1242
}
715
1243
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
1244
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
1245
}
718
1246
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
1247
((struct sockaddr_in *)&to)->sin_port = htons(port);
722
1248
}
723
1249
724
1250
if(quit_now){
732
1258
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
1259
perror_plus("if_indextoname");
734
1260
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1261
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1262
"\n", ip, interface, (uintmax_t)port);
737
1263
}
738
1264
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
1265
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1266
ip, (uintmax_t)port);
741
1267
}
742
1268
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
1269
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;
1270
if(af == AF_INET6){
1271
ret = getnameinfo((struct sockaddr *)&to,
1272
sizeof(struct sockaddr_in6),
1273
addrstr, sizeof(addrstr), NULL, 0,
1274
NI_NUMERICHOST);
1275
} else {
1276
ret = getnameinfo((struct sockaddr *)&to,
1277
sizeof(struct sockaddr_in),
1278
addrstr, sizeof(addrstr), NULL, 0,
1279
NI_NUMERICHOST);
1280
}
1281
if(ret == EAI_SYSTEM){
1282
perror_plus("getnameinfo");
1283
} else if(ret != 0) {
1284
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1285
} else if(strcmp(addrstr, ip) != 0){
1286
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1287
}
1288
}
1289
1290
if(quit_now){
1291
errno = EINTR;
1292
goto mandos_end;
1293
}
1294
1295
while(true){
1296
if(af == AF_INET6){
1297
ret = connect(tcp_sd, (struct sockaddr *)&to,
1298
sizeof(struct sockaddr_in6));
1299
} else {
1300
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1301
sizeof(struct sockaddr_in));
1302
}
1303
if(ret < 0){
1304
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1305
and if_index != AVAHI_IF_UNSPEC
1306
and connect_to == NULL
1307
and not route_added and
1308
((af == AF_INET6 and not
1309
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1310
&to)->sin6_addr)))
1311
or (af == AF_INET and
1312
/* Not a a IPv4LL address */
1313
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1314
& 0xFFFF0000L) != 0xA9FE0000L))){
1315
/* Work around Avahi bug - Avahi does not announce link-local
1316
addresses if it has a global address, so local hosts with
1317
*only* a link-local address (e.g. Mandos clients) cannot
1318
connect to a Mandos server announced by Avahi on a server
1319
host with a global address. Work around this by retrying
1320
with an explicit route added with the server's address.
1321
1322
Avahi bug reference:
1323
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1324
https://bugs.debian.org/587961
1325
*/
1326
if(debug){
1327
fprintf_plus(stderr, "Mandos server unreachable, trying"
1328
" direct route\n");
1329
}
1330
int e = errno;
1331
route_added = add_local_route(ip, if_index);
1332
if(route_added){
1333
continue;
1334
}
1335
errno = e;
1336
}
1337
if(errno != ECONNREFUSED or debug){
1338
int e = errno;
1339
perror_plus("connect");
1340
errno = e;
1341
}
1342
goto mandos_end;
1343
}
1344
1345
if(quit_now){
1346
errno = EINTR;
1347
goto mandos_end;
1348
}
1349
break;
783
1350
}
784
1351
785
1352
const char *out = mandos_protocol_version;
936
1503
if(buffer_length > 0){
937
1504
ssize_t decrypted_buffer_size;
938
1505
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
939
&decrypted_buffer);
1506
&decrypted_buffer, mc);
940
1507
if(decrypted_buffer_size >= 0){
941
1508
1509
clearerr(stdout);
942
1510
written = 0;
943
1511
while(written < (size_t) decrypted_buffer_size){
944
1512
if(quit_now){
960
1528
}
961
1529
written += (size_t)ret;
962
1530
}
1531
ret = fflush(stdout);
1532
if(ret != 0){
1533
int e = errno;
1534
if(debug){
1535
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1536
strerror(errno));
1537
}
1538
errno = e;
1539
goto mandos_end;
1540
}
963
1541
retval = 0;
964
1542
}
965
1543
}
968
1546
969
1547
mandos_end:
970
1548
{
1549
if(route_added){
1550
if(not delete_local_route(ip, if_index)){
1551
fprintf_plus(stderr, "Failed to delete local route to %s on"
1552
" interface %d", ip, if_index);
1553
}
1554
}
971
1555
int e = errno;
972
1556
free(decrypted_buffer);
973
1557
free(buffer);
974
1558
if(tcp_sd >= 0){
975
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1559
ret = close(tcp_sd);
976
1560
}
977
1561
if(ret == -1){
978
1562
if(e == 0){
1003
1587
AVAHI_GCC_UNUSED AvahiStringList *txt,
1004
1588
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1005
1589
flags,
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1590
void *mc){
1591
if(r == NULL){
1592
return;
1593
}
1008
1594
1009
1595
/* Called whenever a service has been resolved successfully or
1010
1596
timed out */
1011
1597
1012
1598
if(quit_now){
1599
avahi_s_service_resolver_free(r);
1013
1600
return;
1014
1601
}
1015
1602
1019
1606
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1020
1607
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1021
1608
domain,
1022
avahi_strerror(avahi_server_errno(mc.server)));
1609
avahi_strerror(avahi_server_errno
1610
(((mandos_context*)mc)->server)));
1023
1611
break;
1024
1612
1025
1613
case AVAHI_RESOLVER_FOUND:
1031
1619
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
1620
host_name, ip, (intmax_t)interface, port);
1033
1621
}
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1622
int ret = start_mandos_communication(ip, (in_port_t)port,
1623
interface,
1624
avahi_proto_to_af(proto),
1625
mc);
1036
1626
if(ret == 0){
1037
avahi_simple_poll_quit(mc.simple_poll);
1627
avahi_simple_poll_quit(simple_poll);
1038
1628
} else {
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1629
if(not add_server(ip, (in_port_t)port, interface,
1630
avahi_proto_to_af(proto),
1631
&((mandos_context*)mc)->current_server)){
1041
1632
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
1633
" list\n", name);
1043
1634
}
1056
1647
const char *domain,
1057
1648
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
1649
flags,
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1650
void *mc){
1651
if(b == NULL){
1652
return;
1653
}
1061
1654
1062
1655
/* Called whenever a new services becomes available on the LAN or
1063
1656
is removed from the LAN */
1071
1664
case AVAHI_BROWSER_FAILURE:
1072
1665
1073
1666
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1667
avahi_strerror(avahi_server_errno
1668
(((mandos_context*)mc)->server)));
1669
avahi_simple_poll_quit(simple_poll);
1076
1670
return;
1077
1671
1078
1672
case AVAHI_BROWSER_NEW:
1081
1675
the callback function is called the Avahi server will free the
1082
1676
resolver for us. */
1083
1677
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1678
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1679
interface, protocol, name, type,
1680
domain, protocol, 0,
1681
resolve_callback, mc) == NULL)
1087
1682
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
1683
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
1684
avahi_strerror(avahi_server_errno
1685
(((mandos_context*)mc)->server)));
1090
1686
break;
1091
1687
1092
1688
case AVAHI_BROWSER_REMOVE:
1111
1707
signal_received = sig;
1112
1708
int old_errno = errno;
1113
1709
/* set main loop to exit */
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1710
if(simple_poll != NULL){
1711
avahi_simple_poll_quit(simple_poll);
1116
1712
}
1117
1713
errno = old_errno;
1118
1714
}
1119
1715
1716
__attribute__((nonnull, warn_unused_result))
1120
1717
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
1718
int ret;
1719
int old_errno;
1122
1720
1123
1721
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
1722
if(s < 0){
1723
old_errno = errno;
1125
1724
perror_plus("socket");
1725
errno = old_errno;
1126
1726
return false;
1127
1727
}
1128
strcpy(ifr->ifr_name, ifname);
1728
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1729
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1129
1730
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
1731
if(ret == -1){
1131
1732
if(debug){
1733
old_errno = errno;
1132
1734
perror_plus("ioctl SIOCGIFFLAGS");
1735
errno = old_errno;
1736
}
1737
if((close(s) == -1) and debug){
1738
old_errno = errno;
1739
perror_plus("close");
1740
errno = old_errno;
1133
1741
}
1134
1742
return false;
1135
1743
}
1744
if((close(s) == -1) and debug){
1745
old_errno = errno;
1746
perror_plus("close");
1747
errno = old_errno;
1748
}
1136
1749
return true;
1137
1750
}
1138
1751
1752
__attribute__((nonnull, warn_unused_result))
1139
1753
bool good_flags(const char *ifname, const struct ifreq *ifr){
1140
1754
1141
1755
/* Reject the loopback device */
1183
1797
* corresponds to an acceptable network device.
1184
1798
* (This function is passed to scandir(3) as a filter function.)
1185
1799
*/
1800
__attribute__((nonnull, warn_unused_result))
1186
1801
int good_interface(const struct dirent *if_entry){
1187
1802
if(if_entry->d_name[0] == '.'){
1188
1803
return 0;
1204
1819
}
1205
1820
1206
1821
/*
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1247
}
1248
1822
* This function determines if a network interface is up.
1823
*/
1824
__attribute__((nonnull, warn_unused_result))
1825
bool interface_is_up(const char *interface){
1826
struct ifreq ifr;
1827
if(not get_flags(interface, &ifr)){
1828
if(debug){
1829
fprintf_plus(stderr, "Failed to get flags for interface "
1830
"\"%s\"\n", interface);
1831
}
1832
return false;
1833
}
1834
1835
return (bool)(ifr.ifr_flags & IFF_UP);
1836
}
1837
1838
/*
1839
* This function determines if a network interface is running
1840
*/
1841
__attribute__((nonnull, warn_unused_result))
1842
bool interface_is_running(const char *interface){
1843
struct ifreq ifr;
1844
if(not get_flags(interface, &ifr)){
1845
if(debug){
1846
fprintf_plus(stderr, "Failed to get flags for interface "
1847
"\"%s\"\n", interface);
1848
}
1849
return false;
1850
}
1851
1852
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1853
}
1854
1855
__attribute__((nonnull, pure, warn_unused_result))
1249
1856
int notdotentries(const struct dirent *direntry){
1250
1857
/* Skip "." and ".." */
1251
1858
if(direntry->d_name[0] == '.'
1258
1865
}
1259
1866
1260
1867
/* Is this directory entry a runnable program? */
1868
__attribute__((nonnull, warn_unused_result))
1261
1869
int runnable_hook(const struct dirent *direntry){
1262
1870
int ret;
1263
1871
size_t sret;
1271
1879
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
1880
"abcdefghijklmnopqrstuvwxyz"
1273
1881
"0123456789"
1274
"_-");
1882
"_.-");
1275
1883
if((direntry->d_name)[sret] != '\0'){
1276
1884
/* Contains non-allowed characters */
1277
1885
if(debug){
1281
1889
return 0;
1282
1890
}
1283
1891
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1892
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1292
1893
if(ret == -1){
1293
1894
if(debug){
1294
1895
perror_plus("Could not stat hook");
1318
1919
return 1;
1319
1920
}
1320
1921
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1922
__attribute__((nonnull, warn_unused_result))
1923
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1924
mandos_context *mc){
1322
1925
int ret;
1323
1926
struct timespec now;
1324
1927
struct timespec waited_time;
1325
1928
intmax_t block_time;
1326
1929
1327
1930
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1931
if(mc->current_server == NULL){
1932
if(debug){
1330
1933
fprintf_plus(stderr, "Wait until first server is found."
1331
1934
" No timeout!\n");
1332
1935
}
1333
1936
ret = avahi_simple_poll_iterate(s, -1);
1334
1937
} else {
1335
if (debug){
1938
if(debug){
1336
1939
fprintf_plus(stderr, "Check current_server if we should run"
1337
1940
" it, or wait\n");
1338
1941
}
1345
1948
/* Calculating in ms how long time between now and server
1346
1949
who we visted longest time ago. Now - last seen. */
1347
1950
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1951
- mc->current_server->last_seen.tv_sec);
1349
1952
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1953
- mc->current_server->last_seen.tv_nsec);
1351
1954
/* total time is 10s/10,000ms.
1352
1955
Converting to s from ms by dividing by 1,000,
1353
1956
and ns to ms by dividing by 1,000,000. */
1355
1958
- ((intmax_t)waited_time.tv_sec * 1000))
1356
1959
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1960
1358
if (debug){
1961
if(debug){
1359
1962
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
1963
block_time);
1361
1964
}
1362
1965
1363
1966
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1967
ret = start_mandos_communication(mc->current_server->ip,
1968
mc->current_server->port,
1969
mc->current_server->if_index,
1970
mc->current_server->af, mc);
1368
1971
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1972
avahi_simple_poll_quit(s);
1370
1973
return 0;
1371
1974
}
1372
1975
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1976
&mc->current_server->last_seen);
1374
1977
if(ret == -1){
1375
1978
perror_plus("clock_gettime");
1376
1979
return -1;
1377
1980
}
1378
mc.current_server = mc.current_server->next;
1981
mc->current_server = mc->current_server->next;
1379
1982
block_time = 0; /* Call avahi to find new Mandos
1380
1983
servers, but don't block */
1381
1984
}
1383
1986
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
1987
}
1385
1988
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1989
if(ret > 0 or errno != EINTR){
1387
1990
return (ret != 1) ? ret : 0;
1388
1991
}
1389
1992
}
1390
1993
}
1391
1994
}
1392
1995
1393
bool run_network_hooks(const char *mode, const char *interface,
1996
__attribute__((nonnull))
1997
void run_network_hooks(const char *mode, const char *interface,
1394
1998
const float delay){
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1999
struct dirent **direntries = NULL;
2000
if(hookdir_fd == -1){
2001
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2002
| O_CLOEXEC);
2003
if(hookdir_fd == -1){
2004
if(errno == ENOENT){
2005
if(debug){
2006
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2007
" found\n", hookdir);
2008
}
2009
} else {
2010
perror_plus("open");
2011
}
2012
return;
2013
}
2014
}
2015
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2016
if(devnull == -1){
2017
perror_plus("open(\"/dev/null\", O_RDONLY)");
2018
return;
2019
}
2020
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2021
runnable_hook, alphasort);
1400
2022
if(numhooks == -1){
1401
2023
perror_plus("scandir");
1402
} else {
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1408
if(ret < 0){
2024
close(devnull);
2025
return;
2026
}
2027
struct dirent *direntry;
2028
int ret;
2029
for(int i = 0; i < numhooks; i++){
2030
direntry = direntries[i];
2031
if(debug){
2032
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2033
direntry->d_name);
2034
}
2035
pid_t hook_pid = fork();
2036
if(hook_pid == 0){
2037
/* Child */
2038
/* Raise privileges */
2039
errno = raise_privileges_permanently();
2040
if(errno != 0){
2041
perror_plus("Failed to raise privileges");
2042
_exit(EX_NOPERM);
2043
}
2044
/* Set group */
2045
errno = 0;
2046
ret = setgid(0);
2047
if(ret == -1){
2048
perror_plus("setgid");
2049
_exit(EX_NOPERM);
2050
}
2051
/* Reset supplementary groups */
2052
errno = 0;
2053
ret = setgroups(0, NULL);
2054
if(ret == -1){
2055
perror_plus("setgroups");
2056
_exit(EX_NOPERM);
2057
}
2058
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2059
if(ret == -1){
2060
perror_plus("setenv");
2061
_exit(EX_OSERR);
2062
}
2063
ret = setenv("DEVICE", interface, 1);
2064
if(ret == -1){
2065
perror_plus("setenv");
2066
_exit(EX_OSERR);
2067
}
2068
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2069
if(ret == -1){
2070
perror_plus("setenv");
2071
_exit(EX_OSERR);
2072
}
2073
ret = setenv("MODE", mode, 1);
2074
if(ret == -1){
2075
perror_plus("setenv");
2076
_exit(EX_OSERR);
2077
}
2078
char *delaystring;
2079
ret = asprintf(&delaystring, "%f", (double)delay);
2080
if(ret == -1){
1409
2081
perror_plus("asprintf");
1410
continue;
1411
}
1412
if(debug){
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1414
direntry->d_name);
1415
}
1416
pid_t hook_pid = fork();
1417
if(hook_pid == 0){
1418
/* Child */
1419
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1431
/* Set group */
1432
errno = 0;
1433
ret = setgid(0);
1434
if(ret == -1){
1435
perror_plus("setgid");
1436
}
1437
/* Reset supplementary groups */
1438
errno = 0;
1439
ret = setgroups(0, NULL);
1440
if(ret == -1){
1441
perror_plus("setgroups");
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("DEVICE", interface, 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
ret = setenv("MODE", mode, 1);
1462
if(ret == -1){
1463
perror_plus("setenv");
1464
_exit(EX_OSERR);
1465
}
1466
char *delaystring;
1467
ret = asprintf(&delaystring, "%f", delay);
1468
if(ret == -1){
1469
perror_plus("asprintf");
1470
_exit(EX_OSERR);
1471
}
1472
ret = setenv("DELAY", delaystring, 1);
1473
if(ret == -1){
1474
free(delaystring);
1475
perror_plus("setenv");
1476
_exit(EX_OSERR);
1477
}
2082
_exit(EX_OSERR);
2083
}
2084
ret = setenv("DELAY", delaystring, 1);
2085
if(ret == -1){
1478
2086
free(delaystring);
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1481
if(ret == -1){
1482
perror_plus("setenv");
1483
_exit(EX_OSERR);
1484
}
1485
}
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1489
}
1490
} else {
1491
int status;
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1494
free(fullname);
1495
continue;
1496
}
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1502
free(fullname);
1503
continue;
1504
}
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1508
WTERMSIG(status));
1509
free(fullname);
1510
continue;
1511
} else {
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1514
free(fullname);
1515
continue;
1516
}
1517
}
1518
free(fullname);
1519
if(debug){
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1521
direntry->d_name);
1522
}
1523
}
1524
close(devnull);
1525
}
1526
return true;
2087
perror_plus("setenv");
2088
_exit(EX_OSERR);
2089
}
2090
free(delaystring);
2091
if(connect_to != NULL){
2092
ret = setenv("CONNECT", connect_to, 1);
2093
if(ret == -1){
2094
perror_plus("setenv");
2095
_exit(EX_OSERR);
2096
}
2097
}
2098
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2099
direntry->d_name,
2100
O_RDONLY));
2101
if(hook_fd == -1){
2102
perror_plus("openat");
2103
_exit(EXIT_FAILURE);
2104
}
2105
if(close(hookdir_fd) == -1){
2106
perror_plus("close");
2107
_exit(EXIT_FAILURE);
2108
}
2109
ret = dup2(devnull, STDIN_FILENO);
2110
if(ret == -1){
2111
perror_plus("dup2(devnull, STDIN_FILENO)");
2112
_exit(EX_OSERR);
2113
}
2114
ret = close(devnull);
2115
if(ret == -1){
2116
perror_plus("close");
2117
_exit(EX_OSERR);
2118
}
2119
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2120
if(ret == -1){
2121
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2122
_exit(EX_OSERR);
2123
}
2124
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2125
environ) == -1){
2126
perror_plus("fexecve");
2127
_exit(EXIT_FAILURE);
2128
}
2129
} else {
2130
if(hook_pid == -1){
2131
perror_plus("fork");
2132
free(direntry);
2133
continue;
2134
}
2135
int status;
2136
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2137
perror_plus("waitpid");
2138
free(direntry);
2139
continue;
2140
}
2141
if(WIFEXITED(status)){
2142
if(WEXITSTATUS(status) != 0){
2143
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2144
" with status %d\n", direntry->d_name,
2145
WEXITSTATUS(status));
2146
free(direntry);
2147
continue;
2148
}
2149
} else if(WIFSIGNALED(status)){
2150
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2151
" signal %d\n", direntry->d_name,
2152
WTERMSIG(status));
2153
free(direntry);
2154
continue;
2155
} else {
2156
fprintf_plus(stderr, "Warning: network hook \"%s\""
2157
" crashed\n", direntry->d_name);
2158
free(direntry);
2159
continue;
2160
}
2161
}
2162
if(debug){
2163
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2164
direntry->d_name);
2165
}
2166
free(direntry);
2167
}
2168
free(direntries);
2169
if(close(hookdir_fd) == -1){
2170
perror_plus("close");
2171
} else {
2172
hookdir_fd = -1;
2173
}
2174
close(devnull);
2175
}
2176
2177
__attribute__((nonnull, warn_unused_result))
2178
int bring_up_interface(const char *const interface,
2179
const float delay){
2180
int old_errno = errno;
2181
int ret;
2182
struct ifreq network;
2183
unsigned int if_index = if_nametoindex(interface);
2184
if(if_index == 0){
2185
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2186
errno = old_errno;
2187
return ENXIO;
2188
}
2189
2190
if(quit_now){
2191
errno = old_errno;
2192
return EINTR;
2193
}
2194
2195
if(not interface_is_up(interface)){
2196
int ret_errno = 0;
2197
int ioctl_errno = 0;
2198
if(not get_flags(interface, &network)){
2199
ret_errno = errno;
2200
fprintf_plus(stderr, "Failed to get flags for interface "
2201
"\"%s\"\n", interface);
2202
errno = old_errno;
2203
return ret_errno;
2204
}
2205
network.ifr_flags |= IFF_UP; /* set flag */
2206
2207
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2208
if(sd == -1){
2209
ret_errno = errno;
2210
perror_plus("socket");
2211
errno = old_errno;
2212
return ret_errno;
2213
}
2214
2215
if(quit_now){
2216
ret = close(sd);
2217
if(ret == -1){
2218
perror_plus("close");
2219
}
2220
errno = old_errno;
2221
return EINTR;
2222
}
2223
2224
if(debug){
2225
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2226
interface);
2227
}
2228
2229
/* Raise privileges */
2230
ret_errno = raise_privileges();
2231
if(ret_errno != 0){
2232
errno = ret_errno;
2233
perror_plus("Failed to raise privileges");
2234
}
2235
2236
#ifdef __linux__
2237
int ret_linux;
2238
bool restore_loglevel = false;
2239
if(ret_errno == 0){
2240
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2241
messages about the network interface to mess up the prompt */
2242
ret_linux = klogctl(8, NULL, 5);
2243
if(ret_linux == -1){
2244
perror_plus("klogctl");
2245
} else {
2246
restore_loglevel = true;
2247
}
2248
}
2249
#endif /* __linux__ */
2250
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2251
ioctl_errno = errno;
2252
#ifdef __linux__
2253
if(restore_loglevel){
2254
ret_linux = klogctl(7, NULL, 0);
2255
if(ret_linux == -1){
2256
perror_plus("klogctl");
2257
}
2258
}
2259
#endif /* __linux__ */
2260
2261
/* If raise_privileges() succeeded above */
2262
if(ret_errno == 0){
2263
/* Lower privileges */
2264
ret_errno = lower_privileges();
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("Failed to lower privileges");
2268
}
2269
}
2270
2271
/* Close the socket */
2272
ret = close(sd);
2273
if(ret == -1){
2274
perror_plus("close");
2275
}
2276
2277
if(ret_setflags == -1){
2278
errno = ioctl_errno;
2279
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2280
errno = old_errno;
2281
return ioctl_errno;
2282
}
2283
} else if(debug){
2284
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2285
interface);
2286
}
2287
2288
/* Sleep checking until interface is running.
2289
Check every 0.25s, up to total time of delay */
2290
for(int i = 0; i < delay * 4; i++){
2291
if(interface_is_running(interface)){
2292
break;
2293
}
2294
struct timespec sleeptime = { .tv_nsec = 250000000 };
2295
ret = nanosleep(&sleeptime, NULL);
2296
if(ret == -1 and errno != EINTR){
2297
perror_plus("nanosleep");
2298
}
2299
}
2300
2301
errno = old_errno;
2302
return 0;
2303
}
2304
2305
__attribute__((nonnull, warn_unused_result))
2306
int take_down_interface(const char *const interface){
2307
int old_errno = errno;
2308
struct ifreq network;
2309
unsigned int if_index = if_nametoindex(interface);
2310
if(if_index == 0){
2311
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2312
errno = old_errno;
2313
return ENXIO;
2314
}
2315
if(interface_is_up(interface)){
2316
int ret_errno = 0;
2317
int ioctl_errno = 0;
2318
if(not get_flags(interface, &network) and debug){
2319
ret_errno = errno;
2320
fprintf_plus(stderr, "Failed to get flags for interface "
2321
"\"%s\"\n", interface);
2322
errno = old_errno;
2323
return ret_errno;
2324
}
2325
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2326
2327
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2328
if(sd == -1){
2329
ret_errno = errno;
2330
perror_plus("socket");
2331
errno = old_errno;
2332
return ret_errno;
2333
}
2334
2335
if(debug){
2336
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2337
interface);
2338
}
2339
2340
/* Raise privileges */
2341
ret_errno = raise_privileges();
2342
if(ret_errno != 0){
2343
errno = ret_errno;
2344
perror_plus("Failed to raise privileges");
2345
}
2346
2347
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2348
ioctl_errno = errno;
2349
2350
/* If raise_privileges() succeeded above */
2351
if(ret_errno == 0){
2352
/* Lower privileges */
2353
ret_errno = lower_privileges();
2354
if(ret_errno != 0){
2355
errno = ret_errno;
2356
perror_plus("Failed to lower privileges");
2357
}
2358
}
2359
2360
/* Close the socket */
2361
int ret = close(sd);
2362
if(ret == -1){
2363
perror_plus("close");
2364
}
2365
2366
if(ret_setflags == -1){
2367
errno = ioctl_errno;
2368
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2369
errno = old_errno;
2370
return ioctl_errno;
2371
}
2372
} else if(debug){
2373
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2374
interface);
2375
}
2376
2377
errno = old_errno;
2378
return 0;
1527
2379
}
1528
2380
1529
2381
int main(int argc, char *argv[]){
2382
mandos_context mc = { .server = NULL, .dh_bits = 0,
2383
.priority = "SECURE256:!CTYPE-X.509"
2384
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2385
.current_server = NULL, .interfaces = NULL,
2386
.interfaces_size = 0 };
1530
2387
AvahiSServiceBrowser *sb = NULL;
1531
int error;
2388
error_t ret_errno;
1532
2389
int ret;
1533
2390
intmax_t tmpmax;
1534
2391
char *tmp;
1535
2392
int exitcode = EXIT_SUCCESS;
1536
const char *interface = "";
1537
struct ifreq network;
1538
int sd = -1;
1539
bool take_down_interface = false;
1540
uid_t uid;
1541
gid_t gid;
1542
char tempdir[] = "/tmp/mandosXXXXXX";
1543
bool tempdir_created = false;
2393
char *interfaces_to_take_down = NULL;
2394
size_t interfaces_to_take_down_size = 0;
2395
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2396
char old_tempdir[] = "/tmp/mandosXXXXXX";
2397
char *tempdir = NULL;
1544
2398
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1545
2399
const char *seckey = PATHDIR "/" SECKEY;
1546
2400
const char *pubkey = PATHDIR "/" PUBKEY;
2401
const char *dh_params_file = NULL;
2402
char *interfaces_hooks = NULL;
1547
2403
1548
2404
bool gnutls_initialized = false;
1549
2405
bool gpgme_initialized = false;
1601
2457
.doc = "Bit length of the prime number used in the"
1602
2458
" Diffie-Hellman key exchange",
1603
2459
.group = 2 },
2460
{ .name = "dh-params", .key = 134,
2461
.arg = "FILE",
2462
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2463
" for the Diffie-Hellman key exchange",
2464
.group = 2 },
1604
2465
{ .name = "priority", .key = 130,
1605
2466
.arg = "STRING",
1606
2467
.doc = "GnuTLS priority string for the TLS handshake",
1640
2501
connect_to = arg;
1641
2502
break;
1642
2503
case 'i': /* --interface */
1643
interface = arg;
2504
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2505
arg, (int)',');
2506
if(ret_errno != 0){
2507
argp_error(state, "%s", strerror(ret_errno));
2508
}
1644
2509
break;
1645
2510
case 's': /* --seckey */
1646
2511
seckey = arg;
1657
2522
}
1658
2523
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1659
2524
break;
2525
case 134: /* --dh-params */
2526
dh_params_file = arg;
2527
break;
1660
2528
case 130: /* --priority */
1661
2529
mc.priority = arg;
1662
2530
break;
1702
2570
.args_doc = "",
1703
2571
.doc = "Mandos client -- Get and decrypt"
1704
2572
" passwords from a Mandos server" };
1705
ret = argp_parse(&argp, argc, argv,
1706
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1707
switch(ret){
2573
ret_errno = argp_parse(&argp, argc, argv,
2574
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2575
switch(ret_errno){
1708
2576
case 0:
1709
2577
break;
1710
2578
case ENOMEM:
1711
2579
default:
1712
errno = ret;
2580
errno = ret_errno;
1713
2581
perror_plus("argp_parse");
1714
2582
exitcode = EX_OSERR;
1715
2583
goto end;
1718
2586
goto end;
1719
2587
}
1720
2588
}
1721
2589
1722
2590
{
1723
2591
/* Work around Debian bug #633582:
1724
<http://bugs.debian.org/633582> */
2592
<https://bugs.debian.org/633582> */
1725
2593
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2594
/* Re-raise privileges */
2595
ret = raise_privileges();
2596
if(ret != 0){
2597
errno = ret;
2598
perror_plus("Failed to raise privileges");
1731
2599
} else {
1732
2600
struct stat st;
1733
2601
1748
2616
}
1749
2617
}
1750
2618
}
1751
TEMP_FAILURE_RETRY(close(seckey_fd));
2619
close(seckey_fd);
1752
2620
}
1753
2621
}
1754
2622
1755
2623
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1756
2624
int pubkey_fd = open(pubkey, O_RDONLY);
1757
2625
if(pubkey_fd == -1){
1769
2637
}
1770
2638
}
1771
2639
}
1772
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
}
1774
}
1775
2640
close(pubkey_fd);
2641
}
2642
}
2643
2644
if(dh_params_file != NULL
2645
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2646
int dhparams_fd = open(dh_params_file, O_RDONLY);
2647
if(dhparams_fd == -1){
2648
perror_plus("open");
2649
} else {
2650
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2651
if(ret == -1){
2652
perror_plus("fstat");
2653
} else {
2654
if(S_ISREG(st.st_mode)
2655
and st.st_uid == 0 and st.st_gid == 0){
2656
ret = fchown(dhparams_fd, uid, gid);
2657
if(ret == -1){
2658
perror_plus("fchown");
2659
}
2660
}
2661
}
2662
close(dhparams_fd);
2663
}
2664
}
2665
1776
2666
/* Lower privileges */
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
2667
ret = lower_privileges();
2668
if(ret != 0){
2669
errno = ret;
2670
perror_plus("Failed to lower privileges");
2671
}
2672
}
2673
}
2674
2675
/* Remove invalid interface names (except "none") */
2676
{
2677
char *interface = NULL;
2678
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2679
interface))){
2680
if(strcmp(interface, "none") != 0
2681
and if_nametoindex(interface) == 0){
2682
if(interface[0] != '\0'){
2683
fprintf_plus(stderr, "Not using nonexisting interface"
2684
" \"%s\"\n", interface);
2685
}
2686
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2687
interface = NULL;
1781
2688
}
1782
2689
}
1783
2690
}
1784
2691
1785
2692
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2693
{
2694
if(mc.interfaces != NULL){
2695
interfaces_hooks = malloc(mc.interfaces_size);
2696
if(interfaces_hooks == NULL){
2697
perror_plus("malloc");
2698
goto end;
2699
}
2700
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2701
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2702
}
2703
run_network_hooks("start", interfaces_hooks != NULL ?
2704
interfaces_hooks : "", delay);
1788
2705
}
1789
2706
1790
2707
if(not debug){
1791
2708
avahi_set_log_function(empty_log);
1792
2709
}
1793
2710
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
1826
2711
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1827
2712
from the signal handler */
1828
2713
/* Initialize the pseudo-RNG for Avahi */
1829
2714
srand((unsigned int) time(NULL));
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2715
simple_poll = avahi_simple_poll_new();
2716
if(simple_poll == NULL){
1832
2717
fprintf_plus(stderr,
1833
2718
"Avahi: Failed to create simple poll object.\n");
1834
2719
exitcode = EX_UNAVAILABLE;
1898
2783
}
1899
2784
}
1900
2785
1901
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1921
#ifdef __linux__
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1929
}
1930
#endif /* __linux__ */
1931
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1956
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1981
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
perror_plus("klogctl");
2786
/* If no interfaces were specified, make a list */
2787
if(mc.interfaces == NULL){
2788
struct dirent **direntries = NULL;
2789
/* Look for any good interfaces */
2790
ret = scandir(sys_class_net, &direntries, good_interface,
2791
alphasort);
2792
if(ret >= 1){
2793
/* Add all found interfaces to interfaces list */
2794
for(int i = 0; i < ret; ++i){
2795
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2796
direntries[i]->d_name);
2797
if(ret_errno != 0){
2798
errno = ret_errno;
2799
perror_plus("argz_add");
2800
free(direntries[i]);
2801
continue;
2802
}
2803
if(debug){
2804
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2805
direntries[i]->d_name);
2806
}
2807
free(direntries[i]);
2808
}
2809
free(direntries);
2810
} else {
2811
if(ret == 0){
2812
free(direntries);
2813
}
2814
fprintf_plus(stderr, "Could not find a network interface\n");
2815
exitcode = EXIT_FAILURE;
2816
goto end;
2817
}
2818
}
2819
2820
/* Bring up interfaces which are down, and remove any "none"s */
2821
{
2822
char *interface = NULL;
2823
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2824
interface))){
2825
/* If interface name is "none", stop bringing up interfaces.
2826
Also remove all instances of "none" from the list */
2827
if(strcmp(interface, "none") == 0){
2828
argz_delete(&mc.interfaces, &mc.interfaces_size,
2829
interface);
2830
interface = NULL;
2831
while((interface = argz_next(mc.interfaces,
2832
mc.interfaces_size, interface))){
2833
if(strcmp(interface, "none") == 0){
2834
argz_delete(&mc.interfaces, &mc.interfaces_size,
2835
interface);
2836
interface = NULL;
1986
2837
}
1987
2838
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1995
goto end;
1996
}
1997
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2005
2839
break;
2006
2840
}
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2011
}
2012
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
2019
}
2020
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
2841
bool interface_was_up = interface_is_up(interface);
2842
errno = bring_up_interface(interface, delay);
2843
if(not interface_was_up){
2844
if(errno != 0){
2845
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2846
" %s\n", interface, strerror(errno));
2847
} else {
2848
errno = argz_add(&interfaces_to_take_down,
2849
&interfaces_to_take_down_size,
2850
interface);
2851
if(errno != 0){
2852
perror_plus("argz_add");
2853
}
2854
}
2855
}
2856
}
2857
if(debug and (interfaces_to_take_down == NULL)){
2858
fprintf_plus(stderr, "No interfaces were brought up\n");
2859
}
2860
}
2861
2862
/* If we only got one interface, explicitly use only that one */
2863
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2864
if(debug){
2865
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2866
mc.interfaces);
2867
}
2868
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2036
2869
}
2037
2870
2038
2871
if(quit_now){
2039
2872
goto end;
2040
2873
}
2041
2874
2042
ret = init_gnutls_global(pubkey, seckey);
2875
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2043
2876
if(ret == -1){
2044
2877
fprintf_plus(stderr, "init_gnutls_global failed\n");
2045
2878
exitcode = EX_UNAVAILABLE;
2052
2885
goto end;
2053
2886
}
2054
2887
2055
if(mkdtemp(tempdir) == NULL){
2888
/* Try /run/tmp before /tmp */
2889
tempdir = mkdtemp(run_tempdir);
2890
if(tempdir == NULL and errno == ENOENT){
2891
if(debug){
2892
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2893
run_tempdir, old_tempdir);
2894
}
2895
tempdir = mkdtemp(old_tempdir);
2896
}
2897
if(tempdir == NULL){
2056
2898
perror_plus("mkdtemp");
2057
2899
goto end;
2058
2900
}
2059
tempdir_created = true;
2060
2901
2061
2902
if(quit_now){
2062
2903
goto end;
2063
2904
}
2064
2905
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2906
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2066
2907
fprintf_plus(stderr, "init_gpgme failed\n");
2067
2908
exitcode = EX_UNAVAILABLE;
2068
2909
goto end;
2078
2919
/* Connect directly, do not use Zeroconf */
2079
2920
/* (Mainly meant for debugging) */
2080
2921
char *address = strrchr(connect_to, ':');
2922
2081
2923
if(address == NULL){
2082
2924
fprintf_plus(stderr, "No colon in address\n");
2083
2925
exitcode = EX_USAGE;
2088
2930
goto end;
2089
2931
}
2090
2932
2091
uint16_t port;
2933
in_port_t port;
2092
2934
errno = 0;
2093
2935
tmpmax = strtoimax(address+1, &tmp, 10);
2094
2936
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2095
or tmpmax != (uint16_t)tmpmax){
2937
or tmpmax != (in_port_t)tmpmax){
2096
2938
fprintf_plus(stderr, "Bad port number\n");
2097
2939
exitcode = EX_USAGE;
2098
2940
goto end;
2099
2941
}
2100
2942
2101
2943
if(quit_now){
2102
2944
goto end;
2103
2945
}
2104
2946
2105
port = (uint16_t)tmpmax;
2947
port = (in_port_t)tmpmax;
2106
2948
*address = '\0';
2107
2949
/* Colon in address indicates IPv6 */
2108
2950
int af;
2124
2966
}
2125
2967
2126
2968
while(not quit_now){
2127
ret = start_mandos_communication(address, port, if_index, af);
2969
ret = start_mandos_communication(address, port, if_index, af,
2970
&mc);
2128
2971
if(quit_now or ret == 0){
2129
2972
break;
2130
2973
}
2132
2975
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
2976
(int)retry_interval);
2134
2977
}
2135
sleep((int)retry_interval);
2978
sleep((unsigned int)retry_interval);
2136
2979
}
2137
2980
2138
if (not quit_now){
2981
if(not quit_now){
2139
2982
exitcode = EXIT_SUCCESS;
2140
2983
}
2141
2984
2156
2999
config.publish_domain = 0;
2157
3000
2158
3001
/* Allocate a new server */
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
3002
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3003
&config, NULL, NULL, &ret);
2162
3004
2163
3005
/* Free the Avahi configuration data */
2164
3006
avahi_server_config_free(&config);
2167
3009
/* Check if creating the Avahi server object succeeded */
2168
3010
if(mc.server == NULL){
2169
3011
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
3012
avahi_strerror(ret));
2171
3013
exitcode = EX_UNAVAILABLE;
2172
3014
goto end;
2173
3015
}
2179
3021
/* Create the Avahi service browser */
2180
3022
sb = avahi_s_service_browser_new(mc.server, if_index,
2181
3023
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
NULL, 0, browse_callback, NULL);
3024
NULL, 0, browse_callback,
3025
(void *)&mc);
2183
3026
if(sb == NULL){
2184
3027
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
3028
avahi_strerror(avahi_server_errno(mc.server)));
2196
3039
if(debug){
2197
3040
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
3041
}
2199
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
3042
3043
ret = avahi_loop_with_timeout(simple_poll,
3044
(int)(retry_interval * 1000), &mc);
2202
3045
if(debug){
2203
3046
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
3047
(ret == 0) ? "successfully" : "with error");
2207
3050
end:
2208
3051
2209
3052
if(debug){
2210
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3053
if(signal_received){
3054
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3055
argv[0], signal_received,
3056
strsignal(signal_received));
3057
} else {
3058
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3059
}
2211
3060
}
2212
3061
2213
3062
/* Cleanup things */
3063
free(mc.interfaces);
3064
2214
3065
if(sb != NULL)
2215
3066
avahi_s_service_browser_free(sb);
2216
3067
2217
3068
if(mc.server != NULL)
2218
3069
avahi_server_free(mc.server);
2219
3070
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
3071
if(simple_poll != NULL)
3072
avahi_simple_poll_free(simple_poll);
2222
3073
2223
3074
if(gnutls_initialized){
2224
3075
gnutls_certificate_free_credentials(mc.cred);
2225
gnutls_global_deinit();
2226
3076
gnutls_dh_params_deinit(mc.dh_params);
2227
3077
}
2228
3078
2236
3086
mc.current_server->prev->next = NULL;
2237
3087
while(mc.current_server != NULL){
2238
3088
server *next = mc.current_server->next;
3089
#ifdef __GNUC__
3090
#pragma GCC diagnostic push
3091
#pragma GCC diagnostic ignored "-Wcast-qual"
3092
#endif
3093
free((char *)(mc.current_server->ip));
3094
#ifdef __GNUC__
3095
#pragma GCC diagnostic pop
3096
#endif
2239
3097
free(mc.current_server);
2240
3098
mc.current_server = next;
2241
3099
}
2242
3100
}
2243
3101
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
3102
/* Re-raise privileges */
2248
3103
{
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
3104
ret = raise_privileges();
3105
if(ret != 0){
3106
errno = ret;
3107
perror_plus("Failed to raise privileges");
3108
} else {
3109
3110
/* Run network hooks */
3111
run_network_hooks("stop", interfaces_hooks != NULL ?
3112
interfaces_hooks : "", delay);
3113
3114
/* Take down the network interfaces which were brought up */
3115
{
3116
char *interface = NULL;
3117
while((interface = argz_next(interfaces_to_take_down,
3118
interfaces_to_take_down_size,
3119
interface))){
3120
ret = take_down_interface(interface);
3121
if(ret != 0){
3122
errno = ret;
3123
perror_plus("Failed to take down interface");
3124
}
3125
}
3126
if(debug and (interfaces_to_take_down == NULL)){
3127
fprintf_plus(stderr, "No interfaces needed to be taken"
3128
" down\n");
3129
}
3130
}
2253
3131
}
2254
3132
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2265
}
2266
}
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
3133
ret = lower_privileges_permanently();
3134
if(ret != 0){
3135
errno = ret;
3136
perror_plus("Failed to lower privileges permanently");
2271
3137
}
2272
3138
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
3139
3140
free(interfaces_to_take_down);
3141
free(interfaces_hooks);
3142
3143
void clean_dir_at(int base, const char * const dirname,
3144
uintmax_t level){
3145
struct dirent **direntries = NULL;
3146
int dret;
3147
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3148
O_RDONLY
3149
| O_NOFOLLOW
3150
| O_DIRECTORY
3151
| O_PATH));
3152
if(dir_fd == -1){
3153
perror_plus("open");
3154
return;
3155
}
3156
int numentries = scandirat(dir_fd, ".", &direntries,
3157
notdotentries, alphasort);
3158
if(numentries >= 0){
3159
for(int i = 0; i < numentries; i++){
3160
if(debug){
3161
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3162
dirname, direntries[i]->d_name);
3163
}
3164
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3165
if(dret == -1){
3166
if(errno == EISDIR){
3167
dret = unlinkat(dir_fd, direntries[i]->d_name,
3168
AT_REMOVEDIR);
3169
}
3170
if((dret == -1) and (errno == ENOTEMPTY)
3171
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3172
== 0) and (level == 0)){
3173
/* Recurse only in this special case */
3174
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3175
dret = 0;
3176
}
3177
if((dret == -1) and (errno != ENOENT)){
3178
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3179
direntries[i]->d_name, strerror(errno));
3180
}
3181
}
3182
free(direntries[i]);
3183
}
3184
3185
/* need to clean even if 0 because man page doesn't specify */
3186
free(direntries);
3187
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3188
if(dret == -1 and errno != ENOENT){
3189
perror_plus("rmdir");
3190
}
3191
} else {
3192
perror_plus("scandirat");
3193
}
3194
close(dir_fd);
2278
3195
}
2279
3196
2280
3197
/* Removes the GPGME temp directory and all files inside */
2281
if(tempdir_created){
2282
struct dirent **direntries = NULL;
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2285
alphasort);
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
2289
char *fullname = NULL;
2290
ret = asprintf(&fullname, "%s/%s", tempdir,
2291
direntry->d_name);
2292
if(ret < 0){
2293
perror_plus("asprintf");
2294
continue;
2295
}
2296
ret = remove(fullname);
2297
if(ret == -1){
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
2300
}
2301
free(fullname);
2302
}
2303
}
2304
2305
/* need to clean even if 0 because man page doesn't specify */
2306
free(direntries);
2307
if (numentries == -1){
2308
perror_plus("scandir");
2309
}
2310
ret = rmdir(tempdir);
2311
if(ret == -1 and errno != ENOENT){
2312
perror_plus("rmdir");
2313
}
3198
if(tempdir != NULL){
3199
clean_dir_at(-1, tempdir, 0);
2314
3200
}
2315
3201
2316
3202
if(quit_now){
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Version: 2.0.2.dev0