9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
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
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
30
29
* Contact the authors at <mandos@recompile.se>.
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
64
#include <errno.h> /* perror(), errno,
72
65
program_invocation_short_name */
73
66
#include <time.h> /* nanosleep(), time(), sleep() */
74
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
262
229
new_server->next = new_server;
263
230
new_server->prev = new_server;
264
231
*current_server = new_server;
232
/* Place the new server last in the list */
266
/* Place the new server last in the list */
267
234
new_server->next = *current_server;
268
235
new_server->prev = (*current_server)->prev;
269
236
new_server->prev->next = new_server;
270
237
(*current_server)->prev = new_server;
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
241
perror_plus("clock_gettime");
276
248
* Initialize GPGME.
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,
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
283
252
gpgme_error_t rc;
284
253
gpgme_engine_info_t engine_info;
287
256
* Helper function to insert pub and seckey to the engine keyring.
289
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
292
261
gpgme_data_t pgp_data;
499
467
return plaintext_length;
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){
470
static const char * safer_gnutls_strerror(int value){
511
471
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
515
477
/* GnuTLS log function callback */
516
__attribute__((nonnull))
517
478
static void debuggnutls(__attribute__((unused)) int level,
518
479
const char* string){
519
480
fprintf_plus(stderr, "GnuTLS: %s", string);
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
523
483
static int init_gnutls_global(const char *pubkeyfilename,
524
484
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
485
mandos_context *mc){
531
489
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));
535
500
/* "Use a log level over 10 to enable all debugging options."
536
501
* - GnuTLS manual
574
540
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;
617
if(params.data == NULL){
618
dhparamsfilename = NULL;
620
if(dhparamsfilename == NULL){
623
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
624
GNUTLS_X509_FMT_PEM);
625
if(ret != GNUTLS_E_SUCCESS){
626
fprintf_plus(stderr, "Failed to parse DH parameters in file"
627
" \"%s\": %s\n", dhparamsfilename,
628
safer_gnutls_strerror(ret));
629
dhparamsfilename = NULL;
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
640
int secfile = open(seckeyfilename, O_RDONLY);
645
size_t buffer_capacity = 0;
647
buffer_capacity = incbuffer((char **)&buffer.data,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
663
/* check bytes_read for failure */
670
buffer.size += (unsigned int)bytes_read;
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
683
safer_gnutls_strerror(ret));
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
697
/* Use private key to suggest an appropriate
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
714
fprintf_plus(stderr, "Falling back to security parameter"
716
safe_string(gnutls_sec_param_get_name
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
736
safer_gnutls_strerror(ret));
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
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));
751
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
819
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
820
621
__attribute__((unused)) const char *txt){}
822
/* Set effective uid to 0, return errno */
823
__attribute__((warn_unused_result))
824
int raise_privileges(void){
825
int old_errno = errno;
827
if(seteuid(0) == -1){
834
/* Set effective and real user ID to 0. Return errno. */
835
__attribute__((warn_unused_result))
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
850
/* Set effective user ID to unprivileged saved user ID */
851
__attribute__((warn_unused_result))
852
int lower_privileges(void){
853
int old_errno = errno;
855
if(seteuid(uid) == -1){
862
/* Lower privileges permanently */
863
__attribute__((warn_unused_result))
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
867
if(setuid(uid) == -1){
874
/* Helper function to add_local_route() and delete_local_route() */
875
__attribute__((nonnull, warn_unused_result))
876
static bool add_delete_local_route(const bool add,
878
AvahiIfIndex if_index){
880
char helper[] = "mandos-client-iprouteadddel";
881
char add_arg[] = "add";
882
char delete_arg[] = "delete";
883
char debug_flag[] = "--debug";
884
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
885
if(pluginhelperdir == NULL){
887
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
888
" variable not set; cannot run helper\n");
893
char interface[IF_NAMESIZE];
894
if(if_indextoname((unsigned int)if_index, interface) == NULL){
895
perror_plus("if_indextoname");
899
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
perror_plus("open(\"/dev/null\", O_RDONLY)");
907
/* Raise privileges */
908
errno = raise_privileges_permanently();
910
perror_plus("Failed to raise privileges");
911
/* _exit(EX_NOPERM); */
917
perror_plus("setgid");
920
/* Reset supplementary groups */
922
ret = setgroups(0, NULL);
924
perror_plus("setgroups");
928
ret = dup2(devnull, STDIN_FILENO);
930
perror_plus("dup2(devnull, STDIN_FILENO)");
933
ret = close(devnull);
935
perror_plus("close");
938
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
943
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
948
if(helperdir_fd == -1){
950
_exit(EX_UNAVAILABLE);
952
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
955
perror_plus("openat");
957
_exit(EX_UNAVAILABLE);
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
969
#pragma GCC diagnostic pop
971
perror_plus("fexecve");
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
991
if(kill(pid, SIGTERM) == -1){
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
1000
} while(pret == -1 and errno == EINTR);
1002
perror_plus("waitpid");
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
return add_delete_local_route(true, address, if_index);
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
return add_delete_local_route(false, address, if_index);
1040
623
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
624
static int start_mandos_communication(const char *ip, in_port_t port,
1043
625
AvahiIfIndex if_index,
1044
626
int af, mandos_context *mc){
1045
627
int ret, tcp_sd = -1;
1047
struct sockaddr_storage to;
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
1048
633
char *buffer = NULL;
1049
634
char *decrypted_buffer = NULL;
1050
635
size_t buffer_length = 0;
1190
779
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
780
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1244
Avahi bug reference:
1245
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
route_added = add_local_route(ip, if_index);
1259
if(errno != ECONNREFUSED or debug){
1261
perror_plus("connect");
783
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
786
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
790
perror_plus("inet_ntop");
792
if(strcmp(addrstr, ip) != 0){
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
804
ret = connect(tcp_sd, &to.in6, sizeof(to));
806
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
809
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
811
perror_plus("connect");
1274
822
const char *out = mandos_protocol_version;
1900
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
1903
if(ret > 0 or errno != EINTR){
1429
if (ret > 0 or errno != EINTR){
1904
1430
return (ret != 1) ? ret : 0;
1910
__attribute__((nonnull))
1911
void run_network_hooks(const char *mode, const char *interface,
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1442
perror_plus("seteuid");
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1456
if(setuid(0) == -1){
1458
perror_plus("seteuid");
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1470
perror_plus("seteuid");
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1482
perror_plus("setuid");
1488
bool run_network_hooks(const char *mode, const char *interface,
1912
1489
const float delay){
1913
struct dirent **direntries = NULL;
1914
if(hookdir_fd == -1){
1915
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1917
if(hookdir_fd == -1){
1918
if(errno == ENOENT){
1920
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1921
" found\n", hookdir);
1924
perror_plus("open");
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1934
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1935
runnable_hook, alphasort);
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1936
1495
if(numhooks == -1){
1937
perror_plus("scandir");
1941
struct dirent *direntry;
1943
for(int i = 0; i < numhooks; i++){
1944
direntry = direntries[i];
1946
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1496
if(errno == ENOENT){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1502
perror_plus("scandir");
1949
pid_t hook_pid = fork();
1952
/* Raise privileges */
1953
errno = raise_privileges_permanently();
1955
perror_plus("Failed to raise privileges");
1962
perror_plus("setgid");
1965
/* Reset supplementary groups */
1967
ret = setgroups(0, NULL);
1969
perror_plus("setgroups");
1972
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1974
perror_plus("setenv");
1977
ret = setenv("DEVICE", interface, 1);
1979
perror_plus("setenv");
1982
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1984
perror_plus("setenv");
1987
ret = setenv("MODE", mode, 1);
1989
perror_plus("setenv");
1993
ret = asprintf(&delaystring, "%f", (double)delay);
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1995
1511
perror_plus("asprintf");
1998
ret = setenv("DELAY", delaystring, 1);
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1518
pid_t hook_pid = fork();
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1527
perror_plus("setgid");
1529
/* Reset supplementary groups */
1531
ret = setgroups(0, NULL);
1533
perror_plus("setgroups");
1535
dup2(devnull, STDIN_FILENO);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1540
perror_plus("setenv");
1543
ret = setenv("DEVICE", interface, 1);
1545
perror_plus("setenv");
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1550
perror_plus("setenv");
1553
ret = setenv("MODE", mode, 1);
1555
perror_plus("setenv");
1559
ret = asprintf(&delaystring, "%f", delay);
1561
perror_plus("asprintf");
1564
ret = setenv("DELAY", delaystring, 1);
1567
perror_plus("setenv");
2000
1570
free(delaystring);
2001
perror_plus("setenv");
2005
if(connect_to != NULL){
2006
ret = setenv("CONNECT", connect_to, 1);
2008
perror_plus("setenv");
2012
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2016
perror_plus("openat");
2017
_exit(EXIT_FAILURE);
2019
if(close(hookdir_fd) == -1){
2020
perror_plus("close");
2021
_exit(EXIT_FAILURE);
2023
ret = dup2(devnull, STDIN_FILENO);
2025
perror_plus("dup2(devnull, STDIN_FILENO)");
2028
ret = close(devnull);
2030
perror_plus("close");
2033
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2035
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2038
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2040
perror_plus("fexecve");
2041
_exit(EXIT_FAILURE);
2045
perror_plus("fork");
2050
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2051
perror_plus("waitpid");
2055
if(WIFEXITED(status)){
2056
if(WEXITSTATUS(status) != 0){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2058
" with status %d\n", direntry->d_name,
2059
WEXITSTATUS(status));
2063
} else if(WIFSIGNALED(status)){
2064
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2065
" signal %d\n", direntry->d_name,
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1574
perror_plus("setenv");
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
2070
fprintf_plus(stderr, "Warning: network hook \"%s\""
2071
" crashed\n", direntry->d_name);
2077
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2083
if(close(hookdir_fd) == -1){
2084
perror_plus("close");
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2091
__attribute__((nonnull, warn_unused_result))
2092
int bring_up_interface(const char *const interface,
2094
int old_errno = errno;
1621
error_t bring_up_interface(const char *const interface,
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
2096
1627
struct ifreq network;
2097
1628
unsigned int if_index = if_nametoindex(interface);
2098
1629
if(if_index == 0){
3000
2441
mc.current_server->prev->next = NULL;
3001
2442
while(mc.current_server != NULL){
3002
2443
server *next = mc.current_server->next;
3004
#pragma GCC diagnostic push
3005
#pragma GCC diagnostic ignored "-Wcast-qual"
3007
free((char *)(mc.current_server->ip));
3009
#pragma GCC diagnostic pop
3011
2444
free(mc.current_server);
3012
2445
mc.current_server = next;
3016
/* Re-raise privileges */
2449
/* Re-raise priviliges */
3018
ret = raise_privileges();
3021
perror_plus("Failed to raise privileges");
3024
/* Run network hooks */
3025
run_network_hooks("stop", interfaces_hooks != NULL ?
3026
interfaces_hooks : "", delay);
3028
/* Take down the network interfaces which were brought up */
3030
char *interface = NULL;
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3034
ret = take_down_interface(interface);
3037
perror_plus("Failed to take down interface");
3040
if(debug and (interfaces_to_take_down == NULL)){
3041
fprintf_plus(stderr, "No interfaces needed to be taken"
3047
ret = lower_privileges_permanently();
3050
perror_plus("Failed to lower privileges permanently");
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2457
/* Take down the network interfaces which were brought up */
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2463
ret_errno = take_down_interface(interface);
2466
perror_plus("Failed to take down interface");
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2475
lower_privileges_permanently();
3054
2478
free(interfaces_to_take_down);
3055
2479
free(interfaces_hooks);
3057
void clean_dir_at(int base, const char * const dirname,
2481
/* Removes the GPGME temp directory and all files inside */
2482
if(tempdir_created){
3059
2483
struct dirent **direntries = NULL;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3067
perror_plus("open");
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
2484
struct dirent *direntry = NULL;
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2487
if (numentries > 0){
3073
2488
for(int i = 0; i < numentries; i++){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3096
free(direntries[i]);
3099
/* need to clean even if 0 because man page doesn't specify */
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3106
perror_plus("scandirat");
3111
/* Removes the GPGME temp directory and all files inside */
3112
if(tempdir != NULL){
3113
clean_dir_at(-1, tempdir, 0);
2489
direntry = direntries[i];
2490
char *fullname = NULL;
2491
ret = asprintf(&fullname, "%s/%s", tempdir,
2494
perror_plus("asprintf");
2497
ret = remove(fullname);
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2506
/* need to clean even if 0 because man page doesn't specify */
2508
if (numentries == -1){
2509
perror_plus("scandir");
2511
ret = rmdir(tempdir);
2512
if(ret == -1 and errno != ENOENT){
2513
perror_plus("rmdir");