9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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
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
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,
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(),
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 <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,
65
72
program_invocation_short_name */
66
73
#include <time.h> /* nanosleep(), time(), sleep() */
67
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
229
262
new_server->next = new_server;
230
263
new_server->prev = new_server;
231
264
*current_server = new_server;
232
/* Place the new server last in the list */
266
/* Place the new server last in the list */
234
267
new_server->next = *current_server;
235
268
new_server->prev = (*current_server)->prev;
236
269
new_server->prev->next = new_server;
237
270
(*current_server)->prev = new_server;
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
241
perror_plus("clock_gettime");
248
276
* Initialize GPGME.
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
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,
252
283
gpgme_error_t rc;
253
284
gpgme_engine_info_t engine_info;
256
287
* Helper function to insert pub and seckey to the engine keyring.
258
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
261
292
gpgme_data_t pgp_data;
279
310
gpgme_strsource(rc), gpgme_strerror(rc));
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");
321
"The total number of considered keys: %d\n",
322
import_result->considered);
324
"The number of keys without user ID: %d\n",
325
import_result->no_user_id);
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);
342
"The total number of secret keys read: %d\n",
343
import_result->secret_read);
345
"The number of imported secret keys: %d\n",
346
import_result->secret_imported);
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",
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));
363
fprintf_plus(stderr, "Key status:\n");
365
import_status->status & GPGME_IMPORT_NEW
366
? "The key was new.\n"
367
: "The key was not new.\n");
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");
373
import_status->status & GPGME_IMPORT_SIG
374
? "The key contained new signatures.\n"
375
: "The key did not contain new signatures.\n");
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");
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");
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
285
391
perror_plus("close");
467
574
return plaintext_length;
470
static const char * safer_gnutls_strerror(int value){
577
__attribute__((warn_unused_result, const))
578
static const char *safe_string(const char *str){
584
__attribute__((warn_unused_result))
585
static const char *safer_gnutls_strerror(int value){
471
586
const char *ret = gnutls_strerror(value);
587
return safe_string(ret);
477
590
/* GnuTLS log function callback */
591
__attribute__((nonnull))
478
592
static void debuggnutls(__attribute__((unused)) int level,
479
593
const char* string){
480
594
fprintf_plus(stderr, "GnuTLS: %s", string);
597
__attribute__((nonnull(1, 2, 4), warn_unused_result))
483
598
static int init_gnutls_global(const char *pubkeyfilename,
484
599
const char *seckeyfilename,
600
const char *dhparamsfilename,
485
601
mandos_context *mc){
489
606
fprintf_plus(stderr, "Initializing GnuTLS\n");
492
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
500
610
/* "Use a log level over 10 to enable all debugging options."
501
611
* - GnuTLS manual
540
649
safer_gnutls_strerror(ret));
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
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 };
656
int dhpfile = open(dhparamsfilename, O_RDONLY);
659
dhparamsfilename = NULL;
662
size_t params_capacity = 0;
664
params_capacity = incbuffer((char **)¶ms.data,
666
(size_t)params_capacity);
667
if(params_capacity == 0){
668
perror_plus("incbuffer");
671
dhparamsfilename = NULL;
674
ssize_t bytes_read = read(dhpfile,
675
params.data + params.size,
681
/* check bytes_read for failure */
686
dhparamsfilename = NULL;
689
params.size += (unsigned int)bytes_read;
691
ret = close(dhpfile);
693
perror_plus("close");
695
if(params.data == NULL){
696
dhparamsfilename = NULL;
698
if(dhparamsfilename == NULL){
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;
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 };
718
int secfile = open(seckeyfilename, O_RDONLY);
723
size_t buffer_capacity = 0;
725
buffer_capacity = incbuffer((char **)&buffer.data,
727
(size_t)buffer_capacity);
728
if(buffer_capacity == 0){
729
perror_plus("incbuffer");
734
ssize_t bytes_read = read(secfile,
735
buffer.data + buffer.size,
741
/* check bytes_read for failure */
748
buffer.size += (unsigned int)bytes_read;
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){
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"
761
safer_gnutls_strerror(ret));
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));
775
/* Use private key to suggest an appropriate
777
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
778
gnutls_openpgp_privkey_deinit(privkey);
780
fprintf_plus(stderr, "This OpenPGP key implies using"
781
" a GnuTLS security parameter \"%s\".\n",
782
safe_string(gnutls_sec_param_get_name
788
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
789
/* Err on the side of caution */
790
sec_param = GNUTLS_SEC_PARAM_ULTRA;
792
fprintf_plus(stderr, "Falling back to security parameter"
794
safe_string(gnutls_sec_param_get_name
799
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
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
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
814
safer_gnutls_strerror(ret));
818
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
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));
550
829
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
620
897
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
621
898
__attribute__((unused)) const char *txt){}
900
/* Set effective uid to 0, return errno */
901
__attribute__((warn_unused_result))
902
int raise_privileges(void){
903
int old_errno = errno;
905
if(seteuid(0) == -1){
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();
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;
933
if(seteuid(uid) == -1){
940
/* Lower privileges permanently */
941
__attribute__((warn_unused_result))
942
int lower_privileges_permanently(void){
943
int old_errno = errno;
945
if(setuid(uid) == -1){
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,
956
AvahiIfIndex if_index){
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){
965
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
966
" variable not set; cannot run helper\n");
971
char interface[IF_NAMESIZE];
972
if(if_indextoname((unsigned int)if_index, interface) == NULL){
973
perror_plus("if_indextoname");
977
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
979
perror_plus("open(\"/dev/null\", O_RDONLY)");
985
/* Raise privileges */
986
errno = raise_privileges_permanently();
988
perror_plus("Failed to raise privileges");
989
/* _exit(EX_NOPERM); */
995
perror_plus("setgid");
998
/* Reset supplementary groups */
1000
ret = setgroups(0, NULL);
1002
perror_plus("setgroups");
1006
ret = dup2(devnull, STDIN_FILENO);
1008
perror_plus("dup2(devnull, STDIN_FILENO)");
1011
ret = close(devnull);
1013
perror_plus("close");
1016
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1018
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1021
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1026
if(helperdir_fd == -1){
1027
perror_plus("open");
1028
_exit(EX_UNAVAILABLE);
1030
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1032
if(helper_fd == -1){
1033
perror_plus("openat");
1034
close(helperdir_fd);
1035
_exit(EX_UNAVAILABLE);
1037
close(helperdir_fd);
1039
#pragma GCC diagnostic push
1040
#pragma GCC diagnostic ignored "-Wcast-qual"
1042
if(fexecve(helper_fd, (char *const [])
1043
{ helper, add ? add_arg : delete_arg, (char *)address,
1044
interface, debug ? debug_flag : NULL, NULL },
1047
#pragma GCC diagnostic pop
1049
perror_plus("fexecve");
1050
_exit(EXIT_FAILURE);
1054
perror_plus("fork");
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");
1069
if(kill(pid, SIGTERM) == -1){
1070
perror_plus("kill");
1072
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1073
perror_plus("Failed to lower privileges after killing"
1078
} while(pret == -1 and errno == EINTR);
1080
perror_plus("waitpid");
1083
if(WIFEXITED(status)){
1084
if(WEXITSTATUS(status) != 0){
1085
fprintf_plus(stderr, "Error: iprouteadddel exited"
1086
" with status %d\n", WEXITSTATUS(status));
1091
if(WIFSIGNALED(status)){
1092
fprintf_plus(stderr, "Error: iprouteadddel died by"
1093
" signal %d\n", WTERMSIG(status));
1096
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1100
__attribute__((nonnull, warn_unused_result))
1101
static bool add_local_route(const char *address,
1102
AvahiIfIndex if_index){
1104
fprintf_plus(stderr, "Adding route to %s\n", address);
1106
return add_delete_local_route(true, address, if_index);
1109
__attribute__((nonnull, warn_unused_result))
1110
static bool delete_local_route(const char *address,
1111
AvahiIfIndex if_index){
1113
fprintf_plus(stderr, "Removing route to %s\n", address);
1115
return add_delete_local_route(false, address, if_index);
623
1118
/* Called when a Mandos server is found */
1119
__attribute__((nonnull, warn_unused_result))
624
1120
static int start_mandos_communication(const char *ip, in_port_t port,
625
1121
AvahiIfIndex if_index,
626
1122
int af, mandos_context *mc){
627
1123
int ret, tcp_sd = -1;
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
1125
struct sockaddr_storage to;
633
1126
char *buffer = NULL;
634
1127
char *decrypted_buffer = NULL;
635
1128
size_t buffer_length = 0;
775
1268
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
1269
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
786
perror_plus("inet_ntop");
788
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
807
perror_plus("connect");
1271
ret = getnameinfo((struct sockaddr *)&to,
1272
sizeof(struct sockaddr_in6),
1273
addrstr, sizeof(addrstr), NULL, 0,
1276
ret = getnameinfo((struct sockaddr *)&to,
1277
sizeof(struct sockaddr_in),
1278
addrstr, sizeof(addrstr), NULL, 0,
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);
1297
ret = connect(tcp_sd, (struct sockaddr *)&to,
1298
sizeof(struct sockaddr_in6));
1300
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1301
sizeof(struct sockaddr_in));
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 *)
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.
1322
Avahi bug reference:
1323
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1324
https://bugs.debian.org/587961
1327
fprintf_plus(stderr, "Mandos server unreachable, trying"
1331
route_added = add_local_route(ip, if_index);
1337
if(errno != ECONNREFUSED or debug){
1339
perror_plus("connect");
818
1352
const char *out = mandos_protocol_version;
1422
1986
ret = avahi_simple_poll_iterate(s, (int)block_time);
1425
if (ret > 0 or errno != EINTR){
1989
if(ret > 0 or errno != EINTR){
1426
1990
return (ret != 1) ? ret : 0;
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1438
perror_plus("seteuid");
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1452
if(setuid(0) == -1){
1454
perror_plus("seteuid");
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1466
perror_plus("seteuid");
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1478
perror_plus("setuid");
1484
bool run_network_hooks(const char *mode, const char *interface,
1996
__attribute__((nonnull))
1997
void run_network_hooks(const char *mode, const char *interface,
1485
1998
const float delay){
1486
struct dirent **direntries;
1999
struct dirent **direntries = NULL;
2000
if(hookdir_fd == -1){
2001
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2003
if(hookdir_fd == -1){
2004
if(errno == ENOENT){
2006
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2007
" found\n", hookdir);
2010
perror_plus("open");
2015
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2017
perror_plus("open(\"/dev/null\", O_RDONLY)");
2020
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2021
runnable_hook, alphasort);
2023
perror_plus("scandir");
1487
2027
struct dirent *direntry;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1492
if(errno == ENOENT){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1498
perror_plus("scandir");
2029
for(int i = 0; i < numhooks; i++){
2030
direntry = direntries[i];
2032
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
2035
pid_t hook_pid = fork();
2038
/* Raise privileges */
2039
errno = raise_privileges_permanently();
2041
perror_plus("Failed to raise privileges");
2048
perror_plus("setgid");
2051
/* Reset supplementary groups */
2053
ret = setgroups(0, NULL);
2055
perror_plus("setgroups");
2058
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2060
perror_plus("setenv");
2063
ret = setenv("DEVICE", interface, 1);
2065
perror_plus("setenv");
2068
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2070
perror_plus("setenv");
2073
ret = setenv("MODE", mode, 1);
2075
perror_plus("setenv");
2079
ret = asprintf(&delaystring, "%f", (double)delay);
1507
2081
perror_plus("asprintf");
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1514
pid_t hook_pid = fork();
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1523
perror_plus("setgid");
1525
/* Reset supplementary groups */
1527
ret = setgroups(0, NULL);
1529
perror_plus("setgroups");
1531
dup2(devnull, STDIN_FILENO);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1536
perror_plus("setenv");
1539
ret = setenv("DEVICE", interface, 1);
1541
perror_plus("setenv");
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1546
perror_plus("setenv");
1549
ret = setenv("MODE", mode, 1);
1551
perror_plus("setenv");
1555
ret = asprintf(&delaystring, "%f", delay);
1557
perror_plus("asprintf");
1560
ret = setenv("DELAY", delaystring, 1);
1563
perror_plus("setenv");
2084
ret = setenv("DELAY", delaystring, 1);
1566
2086
free(delaystring);
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1570
perror_plus("setenv");
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
2087
perror_plus("setenv");
2091
if(connect_to != NULL){
2092
ret = setenv("CONNECT", connect_to, 1);
2094
perror_plus("setenv");
2098
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2102
perror_plus("openat");
2103
_exit(EXIT_FAILURE);
2105
if(close(hookdir_fd) == -1){
2106
perror_plus("close");
2107
_exit(EXIT_FAILURE);
2109
ret = dup2(devnull, STDIN_FILENO);
2111
perror_plus("dup2(devnull, STDIN_FILENO)");
2114
ret = close(devnull);
2116
perror_plus("close");
2119
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2121
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2124
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2126
perror_plus("fexecve");
2127
_exit(EXIT_FAILURE);
2131
perror_plus("fork");
2136
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2137
perror_plus("waitpid");
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));
2149
} else if(WIFSIGNALED(status)){
2150
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2151
" signal %d\n", direntry->d_name,
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2156
fprintf_plus(stderr, "Warning: network hook \"%s\""
2157
" crashed\n", direntry->d_name);
2163
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2169
if(close(hookdir_fd) == -1){
2170
perror_plus("close");
1617
error_t bring_up_interface(const char *const interface,
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
2177
__attribute__((nonnull, warn_unused_result))
2178
int bring_up_interface(const char *const interface,
2180
int old_errno = errno;
1623
2182
struct ifreq network;
1624
2183
unsigned int if_index = if_nametoindex(interface);
1625
2184
if(if_index == 0){
2437
3086
mc.current_server->prev->next = NULL;
2438
3087
while(mc.current_server != NULL){
2439
3088
server *next = mc.current_server->next;
3090
#pragma GCC diagnostic push
3091
#pragma GCC diagnostic ignored "-Wcast-qual"
3093
free((char *)(mc.current_server->ip));
3095
#pragma GCC diagnostic pop
2440
3097
free(mc.current_server);
2441
3098
mc.current_server = next;
2445
/* Re-raise priviliges */
3102
/* Re-raise privileges */
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2453
/* Take down the network interfaces which were brought up */
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2459
ret_errno = take_down_interface(interface);
2462
perror_plus("Failed to take down interface");
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
lower_privileges_permanently();
3104
ret = raise_privileges();
3107
perror_plus("Failed to raise privileges");
3110
/* Run network hooks */
3111
run_network_hooks("stop", interfaces_hooks != NULL ?
3112
interfaces_hooks : "", delay);
3114
/* Take down the network interfaces which were brought up */
3116
char *interface = NULL;
3117
while((interface = argz_next(interfaces_to_take_down,
3118
interfaces_to_take_down_size,
3120
ret = take_down_interface(interface);
3123
perror_plus("Failed to take down interface");
3126
if(debug and (interfaces_to_take_down == NULL)){
3127
fprintf_plus(stderr, "No interfaces needed to be taken"
3133
ret = lower_privileges_permanently();
3136
perror_plus("Failed to lower privileges permanently");
2474
3140
free(interfaces_to_take_down);
2475
3141
free(interfaces_hooks);
3143
void clean_dir_at(int base, const char * const dirname,
3145
struct dirent **direntries = NULL;
3147
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3153
perror_plus("open");
3156
int numentries = scandirat(dir_fd, ".", &direntries,
3157
notdotentries, alphasort);
3158
if(numentries >= 0){
3159
for(int i = 0; i < numentries; i++){
3161
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3162
dirname, direntries[i]->d_name);
3164
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3166
if(errno == EISDIR){
3167
dret = unlinkat(dir_fd, direntries[i]->d_name,
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);
3177
if((dret == -1) and (errno != ENOENT)){
3178
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3179
direntries[i]->d_name, strerror(errno));
3182
free(direntries[i]);
3185
/* need to clean even if 0 because man page doesn't specify */
3187
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3188
if(dret == -1 and errno != ENOENT){
3189
perror_plus("rmdir");
3192
perror_plus("scandirat");
2477
3197
/* Removes the GPGME temp directory and all files inside */
2478
if(tempdir_created){
2479
struct dirent **direntries = NULL;
2480
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2483
if (numentries > 0){
2484
for(int i = 0; i < numentries; i++){
2485
direntry = direntries[i];
2486
char *fullname = NULL;
2487
ret = asprintf(&fullname, "%s/%s", tempdir,
2490
perror_plus("asprintf");
2493
ret = remove(fullname);
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2502
/* need to clean even if 0 because man page doesn't specify */
2504
if (numentries == -1){
2505
perror_plus("scandir");
2507
ret = rmdir(tempdir);
2508
if(ret == -1 and errno != ENOENT){
2509
perror_plus("rmdir");
3198
if(tempdir != NULL){
3199
clean_dir_at(-1, tempdir, 0);