9
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* "browse_callback", and parts of "main".
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11
* Everything else is
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* Copyright © 2008-2018 Teddy Hogeborn
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* Copyright © 2008-2018 Björn Påhlsson
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* This file is part of Mandos.
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* 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
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* (at your option) any later version.
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* Mandos is distributed in the hope that it will be useful, but
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* Copyright © 2008-2016 Teddy Hogeborn
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* Copyright © 2008-2016 Björn Påhlsson
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* 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/>.
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@recompile.se>.
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strtof(), abort() */
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48
#include <stdbool.h> /* bool, false, true */
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#include <string.h> /* strcmp(), strlen(), strerror(),
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asprintf(), strncpy(), strsignal()
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asprintf(), strncpy() */
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#include <sys/ioctl.h> /* ioctl */
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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6,
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/* Set effective uid to 0, return errno */
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__attribute__((warn_unused_result))
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int raise_privileges(void){
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int old_errno = errno;
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error_t raise_privileges(void){
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error_t old_errno = errno;
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error_t ret_errno = 0;
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if(seteuid(0) == -1){
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826
errno = old_errno;
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830
/* Set effective and real user ID to 0. Return errno. */
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__attribute__((warn_unused_result))
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int raise_privileges_permanently(void){
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int old_errno = errno;
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int ret = raise_privileges();
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error_t raise_privileges_permanently(void){
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error_t old_errno = errno;
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error_t ret_errno = raise_privileges();
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errno = old_errno;
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if(setuid(0) == -1){
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errno = old_errno;
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/* Set effective user ID to unprivileged saved user ID */
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__attribute__((warn_unused_result))
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int lower_privileges(void){
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int old_errno = errno;
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error_t lower_privileges(void){
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error_t old_errno = errno;
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error_t ret_errno = 0;
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if(seteuid(uid) == -1){
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854
errno = old_errno;
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/* Lower privileges permanently */
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__attribute__((warn_unused_result))
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int lower_privileges_permanently(void){
864
int old_errno = errno;
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error_t lower_privileges_permanently(void){
861
error_t old_errno = errno;
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error_t ret_errno = 0;
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863
if(setuid(uid) == -1){
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errno = old_errno;
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/* Helper function to add_local_route() and delete_local_route() */
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1077
bool match = false;
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char *interface = NULL;
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while((interface = argz_next(mc->interfaces,
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mc->interfaces_size,
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while((interface=argz_next(mc->interfaces, mc->interfaces_size,
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if(if_nametoindex(interface) == (unsigned int)if_index){
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with an explicit route added with the server's address.
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Avahi bug reference:
1244
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
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http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
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https://bugs.debian.org/587961
1637
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__attribute__((nonnull, warn_unused_result))
1638
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bool get_flags(const char *ifname, struct ifreq *ifr){
1642
1628
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1645
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perror_plus("socket");
1649
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strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
2087
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__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2090
int old_errno = errno;
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error_t bring_up_interface(const char *const interface,
2076
error_t old_errno = errno;
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struct ifreq network;
2093
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unsigned int if_index = if_nametoindex(interface);
2105
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if(not interface_is_up(interface)){
2107
int ioctl_errno = 0;
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error_t ret_errno = 0, ioctl_errno = 0;
2108
2093
if(not get_flags(interface, &network)){
2109
2094
ret_errno = errno;
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fprintf_plus(stderr, "Failed to get flags for interface "
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/* Sleep checking until interface is running.
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Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
2185
for(int i=0; i < delay * 4; i++){
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if(interface_is_running(interface)){
2215
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__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2201
error_t take_down_interface(const char *const interface){
2202
error_t old_errno = errno;
2218
2203
struct ifreq network;
2219
2204
unsigned int if_index = if_nametoindex(interface);
2220
2205
if(if_index == 0){
2225
2210
if(interface_is_up(interface)){
2227
int ioctl_errno = 0;
2211
error_t ret_errno = 0, ioctl_errno = 0;
2228
2212
if(not get_flags(interface, &network) and debug){
2229
2213
ret_errno = errno;
2230
2214
fprintf_plus(stderr, "Failed to get flags for interface "
2480
2464
.args_doc = "",
2481
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.doc = "Mandos client -- Get and decrypt"
2482
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" passwords from a Mandos server" };
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2467
ret = argp_parse(&argp, argc, argv,
2468
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2491
2475
perror_plus("argp_parse");
2492
2476
exitcode = EX_OSERR;
2501
2485
/* Work around Debian bug #633582:
2502
<https://bugs.debian.org/633582> */
2486
<http://bugs.debian.org/633582> */
2504
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/* Re-raise privileges */
2505
ret = raise_privileges();
2489
ret_errno = raise_privileges();
2508
2492
perror_plus("Failed to raise privileges");
2510
2494
struct stat st;
2911
2895
/* Allocate a new server */
2912
2896
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2897
&config, NULL, NULL, &ret_errno);
2915
2899
/* Free the Avahi configuration data */
2916
2900
avahi_server_config_free(&config);
2919
2903
/* Check if creating the Avahi server object succeeded */
2920
2904
if(mc.server == NULL){
2921
2905
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2922
avahi_strerror(ret));
2906
avahi_strerror(ret_errno));
2923
2907
exitcode = EX_UNAVAILABLE;
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2947
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2972
2950
/* Cleanup things */
3024
3002
/* Take down the network interfaces which were brought up */
3026
3004
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3030
ret = take_down_interface(interface);
3005
while((interface=argz_next(interfaces_to_take_down,
3006
interfaces_to_take_down_size,
3008
ret_errno = take_down_interface(interface);
3033
3011
perror_plus("Failed to take down interface");