9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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>.
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
50
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
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,
818
822
/* Set effective uid to 0, return errno */
819
823
__attribute__((warn_unused_result))
820
error_t raise_privileges(void){
821
error_t old_errno = errno;
822
error_t ret_errno = 0;
824
int raise_privileges(void){
825
int old_errno = errno;
823
827
if(seteuid(0) == -1){
826
830
errno = old_errno;
830
834
/* Set effective and real user ID to 0. Return errno. */
831
835
__attribute__((warn_unused_result))
832
error_t raise_privileges_permanently(void){
833
error_t old_errno = errno;
834
error_t ret_errno = raise_privileges();
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
836
840
errno = old_errno;
839
843
if(setuid(0) == -1){
842
846
errno = old_errno;
846
850
/* Set effective user ID to unprivileged saved user ID */
847
851
__attribute__((warn_unused_result))
848
error_t lower_privileges(void){
849
error_t old_errno = errno;
850
error_t ret_errno = 0;
852
int lower_privileges(void){
853
int old_errno = errno;
851
855
if(seteuid(uid) == -1){
854
858
errno = old_errno;
858
862
/* Lower privileges permanently */
859
863
__attribute__((warn_unused_result))
860
error_t lower_privileges_permanently(void){
861
error_t old_errno = errno;
862
error_t ret_errno = 0;
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
863
867
if(setuid(uid) == -1){
866
870
errno = old_errno;
870
874
/* Helper function to add_local_route() and delete_local_route() */
1077
1081
bool match = false;
1079
1083
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1082
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1237
1242
with an explicit route added with the server's address.
1239
1244
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
1246
https://bugs.debian.org/587961
1623
1638
__attribute__((nonnull, warn_unused_result))
1624
1639
bool get_flags(const char *ifname, struct ifreq *ifr){
1628
1643
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1631
1646
perror_plus("socket");
1635
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1912
1934
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
1935
runnable_hook, alphasort);
1914
1936
if(numhooks == -1){
1915
1937
perror_plus("scandir");
1918
1941
struct dirent *direntry;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1925
1943
for(int i = 0; i < numhooks; i++){
1926
1944
direntry = direntries[i];
2073
2091
__attribute__((nonnull, warn_unused_result))
2074
error_t bring_up_interface(const char *const interface,
2076
error_t old_errno = errno;
2092
int bring_up_interface(const char *const interface,
2094
int old_errno = errno;
2078
2096
struct ifreq network;
2079
2097
unsigned int if_index = if_nametoindex(interface);
2091
2109
if(not interface_is_up(interface)){
2092
error_t ret_errno = 0, ioctl_errno = 0;
2111
int ioctl_errno = 0;
2093
2112
if(not get_flags(interface, &network)){
2094
2113
ret_errno = errno;
2095
2114
fprintf_plus(stderr, "Failed to get flags for interface "
2183
2202
/* Sleep checking until interface is running.
2184
2203
Check every 0.25s, up to total time of delay */
2185
for(int i=0; i < delay * 4; i++){
2204
for(int i = 0; i < delay * 4; i++){
2186
2205
if(interface_is_running(interface)){
2200
2219
__attribute__((nonnull, warn_unused_result))
2201
error_t take_down_interface(const char *const interface){
2202
error_t old_errno = errno;
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
2203
2222
struct ifreq network;
2204
2223
unsigned int if_index = if_nametoindex(interface);
2205
2224
if(if_index == 0){
2210
2229
if(interface_is_up(interface)){
2211
error_t ret_errno = 0, ioctl_errno = 0;
2231
int ioctl_errno = 0;
2212
2232
if(not get_flags(interface, &network) and debug){
2213
2233
ret_errno = errno;
2214
2234
fprintf_plus(stderr, "Failed to get flags for interface "
2464
2484
.args_doc = "",
2465
2485
.doc = "Mandos client -- Get and decrypt"
2466
2486
" passwords from a Mandos server" };
2467
ret = argp_parse(&argp, argc, argv,
2468
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2475
2495
perror_plus("argp_parse");
2476
2496
exitcode = EX_OSERR;
2485
2505
/* Work around Debian bug #633582:
2486
<http://bugs.debian.org/633582> */
2506
<https://bugs.debian.org/633582> */
2488
2508
/* Re-raise privileges */
2489
ret_errno = raise_privileges();
2509
ret = raise_privileges();
2492
2512
perror_plus("Failed to raise privileges");
2494
2514
struct stat st;
2895
2915
/* Allocate a new server */
2896
2916
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2897
&config, NULL, NULL, &ret_errno);
2917
&config, NULL, NULL, &ret);
2899
2919
/* Free the Avahi configuration data */
2900
2920
avahi_server_config_free(&config);
2903
2923
/* Check if creating the Avahi server object succeeded */
2904
2924
if(mc.server == NULL){
2905
2925
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2906
avahi_strerror(ret_errno));
2926
avahi_strerror(ret));
2907
2927
exitcode = EX_UNAVAILABLE;
2947
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
2972
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2950
2976
/* Cleanup things */
3002
3028
/* Take down the network interfaces which were brought up */
3004
3030
char *interface = NULL;
3005
while((interface=argz_next(interfaces_to_take_down,
3006
interfaces_to_take_down_size,
3008
ret_errno = take_down_interface(interface);
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3034
ret = take_down_interface(interface);
3011
3037
perror_plus("Failed to take down interface");
3061
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3091
if((dret == -1) and (errno != ENOENT)){
3065
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3066
3093
direntries[i]->d_name, strerror(errno));
3072
3099
/* need to clean even if 0 because man page doesn't specify */
3073
3100
free(direntries);
3074
if(numentries == -1){
3075
perror_plus("scandirat");
3077
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3078
3102
if(dret == -1 and errno != ENOENT){
3079
3103
perror_plus("rmdir");