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/*
*
* Copyright (c) 2013-2015
* name : Francis Banyikwa
* email: mhogomchungu@gmail.com
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/stat.h>
#include <fcntl.h>
#include "../constants.h"
#include "../lib/includes.h"
#include "includes.h"
#include <errno.h>
#include <unistd.h>
static int has_device_access( const char * path,int c )
{
int f ;
if( c == ZULUCRYPTread ){
f = open( path,O_RDONLY ) ;
}else{
f = open( path,O_WRONLY ) ;
}
if( f == -1 ){
switch( errno ){
case EACCES : return 1 ; /* permission denied */
case ENOENT : return 2 ; /* invalid path*/
default : return 4 ; /* common error */
}
}else{
close( f ) ;
return 0 ;
}
}
/*
* 1-permissions denied
* 2-invalid path
* 3-shenanigans
* 4-common error
*/
static int path_is_accessible( const char * path,uid_t uid,int action )
{
int st ;
char * e ;
if( uid ){}
if( StringPrefixEqual( path,"/dev/shm/" ) ){
return 4 ;
}
if( StringPrefixEqual( path,"/dev/" ) ){
if( StringPrefixEqual( path,"/dev/loop" ) ){
/*
* zuluCryptLoopDeviceAddress_1() is defined in ../zuluCrypt-cli/create_loop_device.c
*/
e = zuluCryptLoopDeviceAddress_1( path ) ;
if( e != NULL ){
st = has_device_access( e,action ) ;
StringFree( e ) ;
}else{
return 4 ;
}
}else{
zuluCryptSecurityGainElevatedPrivileges() ;
st = has_device_access( path,action ) ;
zuluCryptSecurityDropElevatedPrivileges() ;
}
return st ;
}else{
zuluCryptSecurityDropElevatedPrivileges() ;
return has_device_access( path,action ) ;
}
}
int zuluCryptCanOpenPathForReading( const char * path,uid_t uid )
{
return path_is_accessible( path,uid,ZULUCRYPTread ) ;
}
int zuluCryptCanOpenPathForWriting( const char * path,uid_t uid )
{
return path_is_accessible( path,uid,ZULUCRYPTwrite ) ;
}
void zuluCryptPrepareSocketPath( uid_t uid )
{
if( uid ){}
}
/*
* return values:
* 5 - couldnt get key from the socket
* 4 -permission denied
* 1 invalid path
* 2 insufficient memory to open file
* 0 success
*/
int zuluCryptGetPassFromFile( int * socket_path,const char * path,uid_t uid,string_t * st )
{
string_t p = String( zuluCryptRunTimePath() ) ;
const char * z = StringContent( p ) ;
size_t s = StringLength( p ) ;
int m = StringPrefixMatch( path,z,s ) ;
StringDelete( &p ) ;
if( socket_path ){
*socket_path = m ;
}
if( m ){
/*
* zuluCryptPrepareSocketPath() is defined in path_access.c
*/
zuluCryptPrepareSocketPath( uid ) ;
zuluCryptSecurityDropElevatedPrivileges() ;
/*
* path that starts with $/tmp/zuluCrypt-$UID is treated not as a path to key file but as path
* to a local socket to get a passphrase
*/
/*
* zuluCryptGetKeyFromSocket() is defined in ../pluginManager/zuluCryptPluginManager.c
*/
zuluCryptGetKeyFromSocket( path,st,uid ) ;
return 0 ;
}else{
zuluCryptSecurityDropElevatedPrivileges() ;
/*
* 8192000 bytes is the default cryptsetup maximum keyfile size
*/
m = StringGetFromFileMemoryLocked( st,path,0,8192000 ) ;
switch( m ){
case 0 : return 0 ;
case 1 : return 4 ;
case 2 : return 2 ;
}
/*
* not supposed to get here
*/
return -1 ;
}
}
char * zuluCryptEvaluateDeviceTags( const char * tag,const char * path )
{
char * r ;
zuluCryptSecurityGainElevatedPrivileges() ;
/*
* zuluCryptDeviceFromUUID() is defined in ../lib/blkid_evaluate_tag.c
* zuluCryptDeviceFromLabel() is defined in ../lib/blkid_evaluate_tag.c
*/
if( StringsAreEqual( tag,"UUID" ) ){
r = zuluCryptDeviceFromUUID( path ) ;
}else{
r = zuluCryptDeviceFromLabel( path ) ;
}
zuluCryptSecurityDropElevatedPrivileges() ;
return r ;
}
char * zuluCryptUUIDFromPath( const char * device )
{
char * c ;
zuluCryptSecurityGainElevatedPrivileges() ;
/*
* zuluCryptUUIDFromPath_1() is defined in ../lib/blkid_evaluate_tag.c
*/
c = zuluCryptUUIDFromPath_1( device ) ;
zuluCryptSecurityDropElevatedPrivileges() ;
return c ;
}
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