9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
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.
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
15
* This file is part of Mandos.
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.
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.
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/>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
* Contact the authors at <mandos@recompile.se>.
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
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()
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
54
56
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open() */
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(),
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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,
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,
152
172
const char *priority;
154
174
server *current_server;
176
size_t interfaces_size;
155
177
} mandos_context;
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
163
182
sig_atomic_t quit_now = 0;
164
183
int signal_received = 0;
166
185
/* Function to use when printing errors */
167
186
void perror_plus(const char *print_text){
168
188
fprintf(stderr, "Mandos plugin %s: ",
169
189
program_invocation_short_name);
170
191
perror(print_text);
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
197
va_start (ap, format);
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
174
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
206
* bytes. "buffer_capacity" is how much is currently allocated,
176
207
* "buffer_length" is how much is already used.
209
__attribute__((nonnull, warn_unused_result))
178
210
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
211
size_t buffer_capacity){
180
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
215
int old_errno = errno;
185
222
buffer_capacity += BUFFER_SIZE;
187
224
return buffer_capacity;
190
227
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
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){
195
232
server *new_server = malloc(sizeof(server));
196
233
if(new_server == NULL){
197
234
perror_plus("malloc");
200
237
*new_server = (server){ .ip = strdup(ip),
202
.if_index = if_index,
239
.if_index = if_index,
204
241
if(new_server->ip == NULL){
205
242
perror_plus("strdup");
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
248
perror_plus("clock_gettime");
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
253
free((char *)(new_server->ip));
255
#pragma GCC diagnostic pop
208
260
/* Special case of first server */
209
if (mc.current_server == NULL){
261
if(*current_server == NULL){
210
262
new_server->next = new_server;
211
263
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
264
*current_server = new_server;
215
new_server->next = mc.current_server;
216
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;
217
269
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
perror_plus("clock_gettime");
270
(*current_server)->prev = new_server;
229
276
* Initialize GPGME.
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, 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,
233
283
gpgme_error_t rc;
234
284
gpgme_engine_info_t engine_info;
238
287
* Helper function to insert pub and seckey to the engine keyring.
240
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
243
292
gpgme_data_t pgp_data;
332
384
ssize_t plaintext_length = 0;
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
387
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
338
390
/* Create new GPGME data buffer from memory cryptotext */
339
391
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
341
393
if(rc != GPG_ERR_NO_ERROR){
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
394
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
347
399
/* Create new empty GPGME data buffer for the plaintext */
348
400
rc = gpgme_data_new(&dh_plain);
349
401
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
402
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
403
gpgme_strsource(rc), gpgme_strerror(rc));
352
404
gpgme_data_release(dh_crypto);
356
408
/* Decrypt data from the cryptotext data buffer to the plaintext
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
411
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
413
gpgme_strsource(rc), gpgme_strerror(rc));
362
414
plaintext_length = -1;
364
416
gpgme_decrypt_result_t result;
365
result = gpgme_op_decrypt_result(mc.ctx);
417
result = gpgme_op_decrypt_result(mc->ctx);
366
418
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
421
if(result->unsupported_algorithm != NULL) {
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
425
fprintf_plus(stderr, "Wrong key usage: %s\n",
426
result->wrong_key_usage ? "Yes" : "No");
373
427
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
428
fprintf_plus(stderr, "File name: %s\n", result->file_name);
376
430
gpgme_recipient_t recipient;
377
431
recipient = result->recipients;
378
432
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
433
fprintf_plus(stderr, "Public key algorithm: %s\n",
434
gpgme_pubkey_algo_name
435
(recipient->pubkey_algo));
436
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
437
fprintf_plus(stderr, "Secret key available: %s\n",
438
recipient->status == GPG_ERR_NO_SECKEY
385
440
recipient = recipient->next;
444
499
return plaintext_length;
447
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
509
__attribute__((warn_unused_result))
510
static const char *safer_gnutls_strerror(int value){
511
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
455
515
/* GnuTLS log function callback */
516
__attribute__((nonnull))
456
517
static void debuggnutls(__attribute__((unused)) int level,
457
518
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
519
fprintf_plus(stderr, "GnuTLS: %s", string);
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
461
523
static int init_gnutls_global(const char *pubkeyfilename,
462
const char *seckeyfilename){
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
466
fprintf(stderr, "Initializing GnuTLS\n");
469
ret = gnutls_global_init();
470
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
484
542
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
544
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
489
gnutls_global_deinit();
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
551
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
552
" secret key %s as GnuTLS credentials\n",
499
557
ret = gnutls_certificate_set_openpgp_key_file
500
(mc.cred, pubkeyfilename, seckeyfilename,
558
(mc->cred, pubkeyfilename, seckeyfilename,
501
559
GNUTLS_OPENPGP_FMT_BASE64);
502
560
if(ret != GNUTLS_E_SUCCESS){
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
562
"Error[%d] while reading the OpenPGP key pair ('%s',"
563
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
564
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
565
safer_gnutls_strerror(ret));
511
569
/* GnuTLS server initialization */
512
ret = gnutls_dh_params_init(&mc.dh_params);
513
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
519
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
ret = gnutls_dh_params_init(&mc->dh_params);
571
if(ret != GNUTLS_E_SUCCESS){
572
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
" initialization: %s\n",
574
safer_gnutls_strerror(ret));
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
dhparamsfilename = NULL;
587
size_t params_capacity = 0;
589
params_capacity = incbuffer((char **)¶ms.data,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
596
dhparamsfilename = NULL;
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
606
/* check bytes_read for failure */
611
dhparamsfilename = NULL;
614
params.size += (unsigned int)bytes_read;
616
ret = close(dhpfile);
618
perror_plus("close");
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
623
if(dhparamsfilename == NULL){
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
643
int secfile = open(seckeyfilename, O_RDONLY);
648
size_t buffer_capacity = 0;
650
buffer_capacity = incbuffer((char **)&buffer.data,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
666
/* check bytes_read for failure */
673
buffer.size += (unsigned int)bytes_read;
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
686
safer_gnutls_strerror(ret));
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
700
/* Use private key to suggest an appropriate
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
717
fprintf_plus(stderr, "Falling back to security parameter"
719
safe_string(gnutls_sec_param_get_name
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
739
safer_gnutls_strerror(ret));
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
754
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
531
gnutls_certificate_free_credentials(mc.cred);
532
gnutls_global_deinit();
533
gnutls_dh_params_deinit(mc.dh_params);
760
gnutls_certificate_free_credentials(mc->cred);
761
gnutls_dh_params_deinit(mc->dh_params);
537
static int init_gnutls_session(gnutls_session_t *session){
765
__attribute__((nonnull, warn_unused_result))
766
static int init_gnutls_session(gnutls_session_t *session,
539
769
/* GnuTLS session creation */
593
822
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
594
823
__attribute__((unused)) const char *txt){}
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
830
if(seteuid(0) == -1){
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
858
if(seteuid(uid) == -1){
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
870
if(setuid(uid) == -1){
877
/* Helper function to add_local_route() and delete_local_route() */
878
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
881
AvahiIfIndex if_index){
883
char helper[] = "mandos-client-iprouteadddel";
884
char add_arg[] = "add";
885
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
if(pluginhelperdir == NULL){
890
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
891
" variable not set; cannot run helper\n");
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
902
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
904
perror_plus("open(\"/dev/null\", O_RDONLY)");
910
/* Raise privileges */
911
errno = raise_privileges_permanently();
913
perror_plus("Failed to raise privileges");
914
/* _exit(EX_NOPERM); */
920
perror_plus("setgid");
923
/* Reset supplementary groups */
925
ret = setgroups(0, NULL);
927
perror_plus("setgroups");
931
ret = dup2(devnull, STDIN_FILENO);
933
perror_plus("dup2(devnull, STDIN_FILENO)");
936
ret = close(devnull);
938
perror_plus("close");
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
943
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
946
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
951
if(helperdir_fd == -1){
953
_exit(EX_UNAVAILABLE);
955
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
958
perror_plus("openat");
960
_exit(EX_UNAVAILABLE);
964
#pragma GCC diagnostic push
965
#pragma GCC diagnostic ignored "-Wcast-qual"
967
if(fexecve(helper_fd, (char *const [])
968
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
972
#pragma GCC diagnostic pop
974
perror_plus("fexecve");
986
pret = waitpid(pid, &status, 0);
987
if(pret == -1 and errno == EINTR and quit_now){
988
int errno_raising = 0;
989
if((errno = raise_privileges()) != 0){
990
errno_raising = errno;
991
perror_plus("Failed to raise privileges in order to"
992
" kill helper program");
994
if(kill(pid, SIGTERM) == -1){
997
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
998
perror_plus("Failed to lower privileges after killing"
1003
} while(pret == -1 and errno == EINTR);
1005
perror_plus("waitpid");
1008
if(WIFEXITED(status)){
1009
if(WEXITSTATUS(status) != 0){
1010
fprintf_plus(stderr, "Error: iprouteadddel exited"
1011
" with status %d\n", WEXITSTATUS(status));
1016
if(WIFSIGNALED(status)){
1017
fprintf_plus(stderr, "Error: iprouteadddel died by"
1018
" signal %d\n", WTERMSIG(status));
1021
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1025
__attribute__((nonnull, warn_unused_result))
1026
static bool add_local_route(const char *address,
1027
AvahiIfIndex if_index){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1031
return add_delete_local_route(true, address, if_index);
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
1036
AvahiIfIndex if_index){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1040
return add_delete_local_route(false, address, if_index);
596
1043
/* Called when a Mandos server is found */
597
static int start_mandos_communication(const char *ip, uint16_t port,
1044
__attribute__((nonnull, warn_unused_result))
1045
static int start_mandos_communication(const char *ip, in_port_t port,
598
1046
AvahiIfIndex if_index,
1047
int af, mandos_context *mc){
600
1048
int ret, tcp_sd = -1;
603
struct sockaddr_in in;
604
struct sockaddr_in6 in6;
1050
struct sockaddr_storage to;
606
1051
char *buffer = NULL;
607
1052
char *decrypted_buffer = NULL;
608
1053
size_t buffer_length = 0;
630
fprintf(stderr, "Bad address family: %d\n", af);
1076
fprintf_plus(stderr, "Bad address family: %d\n", af);
635
ret = init_gnutls_session(&session);
1081
/* If the interface is specified and we have a list of interfaces */
1082
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1083
/* Check if the interface is one of the interfaces we are using */
1086
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1090
if(if_nametoindex(interface) == (unsigned int)if_index){
1097
/* This interface does not match any in the list, so we don't
1098
connect to the server */
1100
char interface[IF_NAMESIZE];
1101
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1102
perror_plus("if_indextoname");
1104
fprintf_plus(stderr, "Skipping server on non-used interface"
1106
if_indextoname((unsigned int)if_index,
1114
ret = init_gnutls_session(&session, mc);
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
1120
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1121
PRIuMAX "\n", ip, (uintmax_t)port);
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
1124
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
648
1127
perror_plus("socket");
709
1183
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
1184
perror_plus("if_indextoname");
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
1186
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1187
"\n", ip, interface, (uintmax_t)port);
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
1190
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1191
ip, (uintmax_t)port);
719
1193
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
1194
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
730
perror_plus("inet_ntop");
732
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
perror_plus("connect");
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in6),
1198
addrstr, sizeof(addrstr), NULL, 0,
1201
ret = getnameinfo((struct sockaddr *)&to,
1202
sizeof(struct sockaddr_in),
1203
addrstr, sizeof(addrstr), NULL, 0,
1206
if(ret == EAI_SYSTEM){
1207
perror_plus("getnameinfo");
1208
} else if(ret != 0) {
1209
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1210
} else if(strcmp(addrstr, ip) != 0){
1211
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1222
ret = connect(tcp_sd, (struct sockaddr *)&to,
1223
sizeof(struct sockaddr_in6));
1225
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1226
sizeof(struct sockaddr_in));
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1230
and if_index != AVAHI_IF_UNSPEC
1231
and connect_to == NULL
1232
and not route_added and
1233
((af == AF_INET6 and not
1234
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1236
or (af == AF_INET and
1237
/* Not a a IPv4LL address */
1238
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1239
& 0xFFFF0000L) != 0xA9FE0000L))){
1240
/* Work around Avahi bug - Avahi does not announce link-local
1241
addresses if it has a global address, so local hosts with
1242
*only* a link-local address (e.g. Mandos clients) cannot
1243
connect to a Mandos server announced by Avahi on a server
1244
host with a global address. Work around this by retrying
1245
with an explicit route added with the server's address.
1247
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
https://bugs.debian.org/587961
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1256
route_added = add_local_route(ip, if_index);
1262
if(errno != ECONNREFUSED or debug){
1264
perror_plus("connect");
762
1277
const char *out = mandos_protocol_version;
1000
1540
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1541
avahi_address_snprint(ip, sizeof(ip), address);
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
1543
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1544
PRIdMAX ") on port %" PRIu16 "\n", name,
1545
host_name, ip, (intmax_t)interface, port);
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1547
int ret = start_mandos_communication(ip, (in_port_t)port,
1549
avahi_proto_to_af(proto),
1010
avahi_simple_poll_quit(mc.simple_poll);
1552
avahi_simple_poll_quit(simple_poll);
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1554
if(not add_server(ip, (in_port_t)port, interface,
1555
avahi_proto_to_af(proto),
1556
&((mandos_context*)mc)->current_server)){
1557
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1079
1632
signal_received = sig;
1080
1633
int old_errno = errno;
1081
1634
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1635
if(simple_poll != NULL){
1636
avahi_simple_poll_quit(simple_poll);
1085
1638
errno = old_errno;
1641
__attribute__((nonnull, warn_unused_result))
1642
bool get_flags(const char *ifname, struct ifreq *ifr){
1646
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1649
perror_plus("socket");
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1655
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1659
perror_plus("ioctl SIOCGIFFLAGS");
1662
if((close(s) == -1) and debug){
1664
perror_plus("close");
1669
if((close(s) == -1) and debug){
1671
perror_plus("close");
1677
__attribute__((nonnull, warn_unused_result))
1678
bool good_flags(const char *ifname, const struct ifreq *ifr){
1680
/* Reject the loopback device */
1681
if(ifr->ifr_flags & IFF_LOOPBACK){
1683
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1688
/* Accept point-to-point devices only if connect_to is specified */
1689
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1691
fprintf_plus(stderr, "Accepting point-to-point interface"
1692
" \"%s\"\n", ifname);
1696
/* Otherwise, reject non-broadcast-capable devices */
1697
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1699
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1700
" \"%s\"\n", ifname);
1704
/* Reject non-ARP interfaces (including dummy interfaces) */
1705
if(ifr->ifr_flags & IFF_NOARP){
1707
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1713
/* Accept this device */
1715
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1089
1721
* This function determines if a directory entry in /sys/class/net
1090
1722
* corresponds to an acceptable network device.
1091
1723
* (This function is passed to scandir(3) as a filter function.)
1725
__attribute__((nonnull, warn_unused_result))
1093
1726
int good_interface(const struct dirent *if_entry){
1095
char *flagname = NULL;
1096
1727
if(if_entry->d_name[0] == '.'){
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1102
perror_plus("asprintf");
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1107
perror_plus("open");
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1126
perror_plus("read");
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1185
/* Accept this device */
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1732
if(not get_flags(if_entry->d_name, &ifr)){
1734
fprintf_plus(stderr, "Failed to get flags for interface "
1735
"\"%s\"\n", if_entry->d_name);
1740
if(not good_flags(if_entry->d_name, &ifr)){
1747
* This function determines if a network interface is up.
1749
__attribute__((nonnull, warn_unused_result))
1750
bool interface_is_up(const char *interface){
1752
if(not get_flags(interface, &ifr)){
1754
fprintf_plus(stderr, "Failed to get flags for interface "
1755
"\"%s\"\n", interface);
1760
return (bool)(ifr.ifr_flags & IFF_UP);
1764
* This function determines if a network interface is running
1766
__attribute__((nonnull, warn_unused_result))
1767
bool interface_is_running(const char *interface){
1769
if(not get_flags(interface, &ifr)){
1771
fprintf_plus(stderr, "Failed to get flags for interface "
1772
"\"%s\"\n", interface);
1777
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1780
__attribute__((nonnull, pure, warn_unused_result))
1193
1781
int notdotentries(const struct dirent *direntry){
1194
1782
/* Skip "." and ".." */
1195
1783
if(direntry->d_name[0] == '.'
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1792
/* Is this directory entry a runnable program? */
1793
__attribute__((nonnull, warn_unused_result))
1794
int runnable_hook(const struct dirent *direntry){
1799
if((direntry->d_name)[0] == '\0'){
1804
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1805
"abcdefghijklmnopqrstuvwxyz"
1808
if((direntry->d_name)[sret] != '\0'){
1809
/* Contains non-allowed characters */
1811
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1817
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1820
perror_plus("Could not stat hook");
1824
if(not (S_ISREG(st.st_mode))){
1825
/* Not a regular file */
1827
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1832
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1833
/* Not executable */
1835
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1841
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1847
__attribute__((nonnull, warn_unused_result))
1848
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1849
mandos_context *mc){
1206
1851
struct timespec now;
1207
1852
struct timespec waited_time;
1208
1853
intmax_t block_time;
1211
if(mc.current_server == NULL){
1214
"Wait until first server is found. No timeout!\n");
1856
if(mc->current_server == NULL){
1858
fprintf_plus(stderr, "Wait until first server is found."
1216
1861
ret = avahi_simple_poll_iterate(s, -1);
1219
fprintf(stderr, "Check current_server if we should run it,"
1864
fprintf_plus(stderr, "Check current_server if we should run"
1222
1867
/* the current time */
1223
1868
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1265
1911
ret = avahi_simple_poll_iterate(s, (int)block_time);
1268
if (ret > 0 or errno != EINTR) {
1914
if(ret > 0 or errno != EINTR){
1269
1915
return (ret != 1) ? ret : 0;
1921
__attribute__((nonnull))
1922
void run_network_hooks(const char *mode, const char *interface,
1924
struct dirent **direntries = NULL;
1925
if(hookdir_fd == -1){
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1928
if(hookdir_fd == -1){
1929
if(errno == ENOENT){
1931
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1932
" found\n", hookdir);
1935
perror_plus("open");
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
runnable_hook, alphasort);
1948
perror_plus("scandir");
1952
struct dirent *direntry;
1954
for(int i = 0; i < numhooks; i++){
1955
direntry = direntries[i];
1957
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1960
pid_t hook_pid = fork();
1963
/* Raise privileges */
1964
errno = raise_privileges_permanently();
1966
perror_plus("Failed to raise privileges");
1973
perror_plus("setgid");
1976
/* Reset supplementary groups */
1978
ret = setgroups(0, NULL);
1980
perror_plus("setgroups");
1983
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1985
perror_plus("setenv");
1988
ret = setenv("DEVICE", interface, 1);
1990
perror_plus("setenv");
1993
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1995
perror_plus("setenv");
1998
ret = setenv("MODE", mode, 1);
2000
perror_plus("setenv");
2004
ret = asprintf(&delaystring, "%f", (double)delay);
2006
perror_plus("asprintf");
2009
ret = setenv("DELAY", delaystring, 1);
2012
perror_plus("setenv");
2016
if(connect_to != NULL){
2017
ret = setenv("CONNECT", connect_to, 1);
2019
perror_plus("setenv");
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2027
perror_plus("openat");
2028
_exit(EXIT_FAILURE);
2030
if(close(hookdir_fd) == -1){
2031
perror_plus("close");
2032
_exit(EXIT_FAILURE);
2034
ret = dup2(devnull, STDIN_FILENO);
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
2039
ret = close(devnull);
2041
perror_plus("close");
2044
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2046
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2049
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2051
perror_plus("fexecve");
2052
_exit(EXIT_FAILURE);
2056
perror_plus("fork");
2061
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2062
perror_plus("waitpid");
2066
if(WIFEXITED(status)){
2067
if(WEXITSTATUS(status) != 0){
2068
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2069
" with status %d\n", direntry->d_name,
2070
WEXITSTATUS(status));
2074
} else if(WIFSIGNALED(status)){
2075
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2076
" signal %d\n", direntry->d_name,
2081
fprintf_plus(stderr, "Warning: network hook \"%s\""
2082
" crashed\n", direntry->d_name);
2088
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2094
if(close(hookdir_fd) == -1){
2095
perror_plus("close");
2102
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2105
int old_errno = errno;
2107
struct ifreq network;
2108
unsigned int if_index = if_nametoindex(interface);
2110
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2120
if(not interface_is_up(interface)){
2122
int ioctl_errno = 0;
2123
if(not get_flags(interface, &network)){
2125
fprintf_plus(stderr, "Failed to get flags for interface "
2126
"\"%s\"\n", interface);
2130
network.ifr_flags |= IFF_UP; /* set flag */
2132
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2135
perror_plus("socket");
2143
perror_plus("close");
2150
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2154
/* Raise privileges */
2155
ret_errno = raise_privileges();
2158
perror_plus("Failed to raise privileges");
2163
bool restore_loglevel = false;
2165
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2166
messages about the network interface to mess up the prompt */
2167
ret_linux = klogctl(8, NULL, 5);
2168
if(ret_linux == -1){
2169
perror_plus("klogctl");
2171
restore_loglevel = true;
2174
#endif /* __linux__ */
2175
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2176
ioctl_errno = errno;
2178
if(restore_loglevel){
2179
ret_linux = klogctl(7, NULL, 0);
2180
if(ret_linux == -1){
2181
perror_plus("klogctl");
2184
#endif /* __linux__ */
2186
/* If raise_privileges() succeeded above */
2188
/* Lower privileges */
2189
ret_errno = lower_privileges();
2192
perror_plus("Failed to lower privileges");
2196
/* Close the socket */
2199
perror_plus("close");
2202
if(ret_setflags == -1){
2203
errno = ioctl_errno;
2204
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2209
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2213
/* Sleep checking until interface is running.
2214
Check every 0.25s, up to total time of delay */
2215
for(int i = 0; i < delay * 4; i++){
2216
if(interface_is_running(interface)){
2219
struct timespec sleeptime = { .tv_nsec = 250000000 };
2220
ret = nanosleep(&sleeptime, NULL);
2221
if(ret == -1 and errno != EINTR){
2222
perror_plus("nanosleep");
2230
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
2233
struct ifreq network;
2234
unsigned int if_index = if_nametoindex(interface);
2236
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2240
if(interface_is_up(interface)){
2242
int ioctl_errno = 0;
2243
if(not get_flags(interface, &network) and debug){
2245
fprintf_plus(stderr, "Failed to get flags for interface "
2246
"\"%s\"\n", interface);
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2252
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
perror_plus("socket");
2261
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2265
/* Raise privileges */
2266
ret_errno = raise_privileges();
2269
perror_plus("Failed to raise privileges");
2272
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2273
ioctl_errno = errno;
2275
/* If raise_privileges() succeeded above */
2277
/* Lower privileges */
2278
ret_errno = lower_privileges();
2281
perror_plus("Failed to lower privileges");
2285
/* Close the socket */
2286
int ret = close(sd);
2288
perror_plus("close");
2291
if(ret_setflags == -1){
2292
errno = ioctl_errno;
2293
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2298
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1275
2306
int main(int argc, char *argv[]){
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
1276
2312
AvahiSServiceBrowser *sb = NULL;
1279
2315
intmax_t tmpmax;
1281
2317
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
1283
struct ifreq network;
1285
bool take_down_interface = false;
1288
char tempdir[] = "/tmp/mandosXXXXXX";
1289
bool tempdir_created = false;
2318
char *interfaces_to_take_down = NULL;
2319
size_t interfaces_to_take_down_size = 0;
2320
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2321
char old_tempdir[] = "/tmp/mandosXXXXXX";
2322
char *tempdir = NULL;
1290
2323
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
2324
const char *seckey = PATHDIR "/" SECKEY;
1292
2325
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
2327
char *interfaces_hooks = NULL;
1294
2329
bool gnutls_initialized = false;
1295
2330
bool gpgme_initialized = false;
1462
2516
/* Work around Debian bug #633582:
1463
<http://bugs.debian.org/633582> */
1466
/* Re-raise priviliges */
1470
perror_plus("seteuid");
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1480
perror_plus("fstat");
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1485
perror_plus("fchown");
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1500
perror_plus("fstat");
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1505
perror_plus("fchown");
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1513
/* Lower privileges */
1517
perror_plus("seteuid");
2517
<https://bugs.debian.org/633582> */
2519
/* Re-raise privileges */
2520
ret = raise_privileges();
2523
perror_plus("Failed to raise privileges");
2527
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2528
int seckey_fd = open(seckey, O_RDONLY);
2529
if(seckey_fd == -1){
2530
perror_plus("open");
2532
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2534
perror_plus("fstat");
2536
if(S_ISREG(st.st_mode)
2537
and st.st_uid == 0 and st.st_gid == 0){
2538
ret = fchown(seckey_fd, uid, gid);
2540
perror_plus("fchown");
2548
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2549
int pubkey_fd = open(pubkey, O_RDONLY);
2550
if(pubkey_fd == -1){
2551
perror_plus("open");
2553
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2555
perror_plus("fstat");
2557
if(S_ISREG(st.st_mode)
2558
and st.st_uid == 0 and st.st_gid == 0){
2559
ret = fchown(pubkey_fd, uid, gid);
2561
perror_plus("fchown");
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2577
perror_plus("fstat");
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2583
perror_plus("fchown");
2591
/* Lower privileges */
2592
ret = lower_privileges();
2595
perror_plus("Failed to lower privileges");
2600
/* Remove invalid interface names (except "none") */
2602
char *interface = NULL;
2603
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2605
if(strcmp(interface, "none") != 0
2606
and if_nametoindex(interface) == 0){
2607
if(interface[0] != '\0'){
2608
fprintf_plus(stderr, "Not using nonexisting interface"
2609
" \"%s\"\n", interface);
2611
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2617
/* Run network hooks */
2619
if(mc.interfaces != NULL){
2620
interfaces_hooks = malloc(mc.interfaces_size);
2621
if(interfaces_hooks == NULL){
2622
perror_plus("malloc");
2625
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2626
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2628
run_network_hooks("start", interfaces_hooks != NULL ?
2629
interfaces_hooks : "", delay);
1522
2633
avahi_set_log_function(empty_log);
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1535
if(interface == NULL){
1536
perror_plus("malloc");
1538
exitcode = EXIT_FAILURE;
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1550
2636
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
2637
from the signal handler */
1552
2638
/* Initialize the pseudo-RNG for Avahi */
1553
2639
srand((unsigned int) time(NULL));
1554
mc.simple_poll = avahi_simple_poll_new();
1555
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2640
simple_poll = avahi_simple_poll_new();
2641
if(simple_poll == NULL){
2642
fprintf_plus(stderr,
2643
"Avahi: Failed to create simple poll object.\n");
1557
2644
exitcode = EX_UNAVAILABLE;
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1637
/* Re-raise priviliges */
1641
perror_plus("seteuid");
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1653
#endif /* __linux__ */
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1663
perror_plus("klogctl");
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1671
perror_plus("seteuid");
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1678
perror_plus("ioctl SIOCGIFFLAGS");
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1683
perror_plus("klogctl");
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1692
perror_plus("seteuid");
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1708
perror_plus("klogctl");
2711
/* If no interfaces were specified, make a list */
2712
if(mc.interfaces == NULL){
2713
struct dirent **direntries = NULL;
2714
/* Look for any good interfaces */
2715
ret = scandir(sys_class_net, &direntries, good_interface,
2718
/* Add all found interfaces to interfaces list */
2719
for(int i = 0; i < ret; ++i){
2720
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2721
direntries[i]->d_name);
2724
perror_plus("argz_add");
2725
free(direntries[i]);
2729
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2730
direntries[i]->d_name);
2732
free(direntries[i]);
2739
fprintf_plus(stderr, "Could not find a network interface\n");
2740
exitcode = EXIT_FAILURE;
2745
/* Bring up interfaces which are down, and remove any "none"s */
2747
char *interface = NULL;
2748
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2750
/* If interface name is "none", stop bringing up interfaces.
2751
Also remove all instances of "none" from the list */
2752
if(strcmp(interface, "none") == 0){
2753
argz_delete(&mc.interfaces, &mc.interfaces_size,
2756
while((interface = argz_next(mc.interfaces,
2757
mc.interfaces_size, interface))){
2758
if(strcmp(interface, "none") == 0){
2759
argz_delete(&mc.interfaces, &mc.interfaces_size,
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1716
perror_plus("seteuid");
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1740
perror_plus("close");
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1748
perror_plus("klogctl");
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1754
if(take_down_interface){
1755
/* Lower privileges */
1758
perror_plus("seteuid");
1761
/* Lower privileges permanently */
1764
perror_plus("setuid");
2766
bool interface_was_up = interface_is_up(interface);
2767
errno = bring_up_interface(interface, delay);
2768
if(not interface_was_up){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2773
errno = argz_add(&interfaces_to_take_down,
2774
&interfaces_to_take_down_size,
2777
perror_plus("argz_add");
2782
if(debug and (interfaces_to_take_down == NULL)){
2783
fprintf_plus(stderr, "No interfaces were brought up\n");
2787
/* If we only got one interface, explicitly use only that one */
2788
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2790
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2793
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1773
ret = init_gnutls_global(pubkey, seckey);
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1775
fprintf(stderr, "init_gnutls_global failed\n");
2802
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2803
exitcode = EX_UNAVAILABLE;
1925
2962
/* Run the main loop */
1928
fprintf(stderr, "Starting Avahi loop search\n");
2965
fprintf_plus(stderr, "Starting Avahi loop search\n");
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
2968
ret = avahi_loop_with_timeout(simple_poll,
2969
(int)(retry_interval * 1000), &mc);
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2971
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2972
(ret == 0) ? "successfully" : "with error");
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1944
2987
/* Cleanup things */
2988
free(mc.interfaces);
1946
2991
avahi_s_service_browser_free(sb);
1948
2993
if(mc.server != NULL)
1949
2994
avahi_server_free(mc.server);
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
2996
if(simple_poll != NULL)
2997
avahi_simple_poll_free(simple_poll);
1954
2999
if(gnutls_initialized){
1955
3000
gnutls_certificate_free_credentials(mc.cred);
1956
gnutls_global_deinit();
1957
3001
gnutls_dh_params_deinit(mc.dh_params);
1960
3004
if(gpgme_initialized){
1961
3005
gpgme_release(mc.ctx);
1964
3008
/* Cleans up the circular linked list of Mandos servers the client
1966
3010
if(mc.current_server != NULL){
1967
3011
mc.current_server->prev->next = NULL;
1968
3012
while(mc.current_server != NULL){
1969
3013
server *next = mc.current_server->next;
3015
#pragma GCC diagnostic push
3016
#pragma GCC diagnostic ignored "-Wcast-qual"
3018
free((char *)(mc.current_server->ip));
3020
#pragma GCC diagnostic pop
1970
3022
free(mc.current_server);
1971
3023
mc.current_server = next;
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1981
perror_plus("seteuid");
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1996
perror_plus("close");
1998
/* Lower privileges permanently */
2002
perror_plus("setuid");
3027
/* Re-raise privileges */
3029
ret = raise_privileges();
3032
perror_plus("Failed to raise privileges");
3035
/* Run network hooks */
3036
run_network_hooks("stop", interfaces_hooks != NULL ?
3037
interfaces_hooks : "", delay);
3039
/* Take down the network interfaces which were brought up */
3041
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3045
ret = take_down_interface(interface);
3048
perror_plus("Failed to take down interface");
3051
if(debug and (interfaces_to_take_down == NULL)){
3052
fprintf_plus(stderr, "No interfaces needed to be taken"
3058
ret = lower_privileges_permanently();
3061
perror_plus("Failed to lower privileges permanently");
3065
free(interfaces_to_take_down);
3066
free(interfaces_hooks);
3068
void clean_dir_at(int base, const char * const dirname,
3070
struct dirent **direntries = NULL;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3078
perror_plus("open");
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
3084
for(int i = 0; i < numentries; i++){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3107
free(direntries[i]);
3110
/* need to clean even if 0 because man page doesn't specify */
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3117
perror_plus("scandirat");
2007
3122
/* Removes the GPGME temp directory and all files inside */
2008
if(tempdir_created){
2009
struct dirent **direntries = NULL;
2010
struct dirent *direntry = NULL;
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2013
if (numentries > 0){
2014
for(int i = 0; i < numentries; i++){
2015
direntry = direntries[i];
2016
char *fullname = NULL;
2017
ret = asprintf(&fullname, "%s/%s", tempdir,
2020
perror_plus("asprintf");
2023
ret = remove(fullname);
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2032
/* need to clean even if 0 because man page doesn't specify */
2034
if (numentries == -1){
2035
perror_plus("scandir");
2037
ret = rmdir(tempdir);
2038
if(ret == -1 and errno != ENOENT){
2039
perror_plus("rmdir");
3123
if(tempdir != NULL){
3124
clean_dir_at(-1, tempdir, 0);