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/*
*
* Copyright (c) 2012-2015
* 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 "includes.h"
#include <libcryptsetup.h>
/*
* This function is responsible for creating a mapper name,the mapper name will show up at "/dev/mapper" if the volume
* is successfully opened.
*
* mapping_name is taken from a path to a volume presented by the user and then "zuluCrypt-XXX-YYYY-ZZZZ-AAAA is added to it to give
* a mapper name unique to zuluCrypt.
*
* XXX is the UID of the user that run the program,YYYY tells if the volume uses UUID or not."NAAN" pads the volume length
* to make sure the length of "zuluCrypt-XXX-YYYY" is always the same regardless of what the user provided.
*
* XXX is there for security reason.It makes sure one user can not manage another user's mappers
*
* ZZZZ is taken from the last component of the device path.
*
* AAAA is hash of the string to prevent collissions if two different volumes that ends with the same ZZZZ are used.
*
* A successfully constructed "ZULUCRYPTshortMapperPath mapper path" will look like "zuluCrypt-500-NAAN-mdraid-2355849641"
*/
string_t zuluCryptCreateMapperName( const char * device,const char * mapping_name,uid_t uid,int i )
{
string_t p ;
unsigned long z ;
char * e ;
/*
* ZULUCRYPTshortMapperPath is set in ../constants.h
*/
if( i == ZULUCRYPTshortMapperPath ){
p = String( "zuluCrypt-" ) ;
}else{
/*
* zuluCryptMapperPrefix() is defined in include.h
*/
p = String_1( zuluCryptMapperPrefix(),"/zuluCrypt-",NULL ) ;
}
StringAppendInt( p,uid ) ;
if( StringPrefixEqual( mapping_name,"UUID-" ) ){
StringMultipleAppend( p,"-",mapping_name,"-",NULL ) ;
z = StringJenkinsOneAtATimeHash( mapping_name ) ;
}else{
StringMultipleAppend( p,"-NAAN-",mapping_name,"-",NULL ) ;
if( StringPrefixEqual( device,"/dev/loop" ) ){
/*
* zuluCryptLoopDeviceAddress_1() is defined in ./create_loop_device.c
*/
e = zuluCryptLoopDeviceAddress_1( device ) ;
if( e != NULL ){
z = StringJenkinsOneAtATimeHash( e ) ;
StringFree( e ) ;
}else{
z = StringJenkinsOneAtATimeHash( device ) ;
}
}else{
z = StringJenkinsOneAtATimeHash( device ) ;
}
}
StringAppendInt( p,z ) ;
StringReplaceCharString( p,'_',BASH_SPECIAL_CHARS ) ;
return p ;
}
static const char * _zuluCryptMapperPrefix = NULL ;
const char * zuluCryptMapperPrefix( void )
{
if( _zuluCryptMapperPrefix == NULL ){
_zuluCryptMapperPrefix = crypt_get_dir() ;
return _zuluCryptMapperPrefix ;
}else{
return _zuluCryptMapperPrefix ;
}
}
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