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/*
*
* Copyright (c) 2011-2015
* 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 <stdio.h>
#include <libintl.h>
static int _zuluCryptExECheckEmptySlots( const char * device )
{
int status = 0 ;
char * c ;
char * d ;
zuluCryptSecurityGainElevatedPrivileges() ;
c = zuluCryptEmptySlots( device ) ;
zuluCryptSecurityDropElevatedPrivileges() ;
if( c == NULL ){
return 1 ;
}
d = c - 1 ;
while( *++d ){
if( *d == '3' ){
status = 3 ;
break ;
}
}
StringFree( c ) ;
return status ;
}
static int zuluExit( int st,stringList_t stl )
{
zuluCryptSecurityUnlockMemory( stl ) ;
/*
* this function is defined in ../string/StringList.c
*/
StringListClearDelete( &stl ) ;
switch ( st ){
case 0 : printf( gettext( "SUCCESS: Key removed successfully\n" ) ) ; break ;
case 2 : printf( gettext( "ERROR: There is no key in the volume that match the presented key\n" ) ) ; break ;
case 3 : printf( gettext( "ERROR: Could not open the volume\n" ) ) ; break ;
case 4 : printf( gettext( "ERROR: Insufficient privilege to open a system device,\
only root user or members of group zulucrypt can do that\n" ) ) ; break ;
case 5 : printf( gettext( "ERROR: Could not open the volume in write mode\n" ) ) ; break ;
case 6 : printf( gettext( "ERROR: Insufficient memory to hold your response\n" ) ) ; break ;
case 7 : printf( gettext( "INFO: Operation terminated per user request\n" ) ) ; break ;
case 8 : printf( gettext( "ERROR: Can not get passphrase in silent mode\n" ) ) ; break ;
case 9 : printf( gettext( "ERROR: Insufficient memory to hold passphrase\n" ) ) ; break ;
case 10: printf( gettext( "ERROR: One or more required argument(s) for this operation is missing\n" ) );break ;
case 11: printf( gettext( "ERROR: Keyfile does not exist\n" ) ) ; break ;
case 12: printf( gettext( "ERROR: Could not get enough memory to open the key file\n" ) ) ; break ;
case 13: printf( gettext( "ERROR: Insufficient privilege to open key file for reading\n" ) ) ; break ;
case 14: printf( gettext( "ERROR: Could not get a key from a socket\n" ) ) ; break ;
default: printf( gettext( "ERROR: Unrecognized error with status number %d encountered\n" ),st );
}
return st ;
}
static int zuluExit_1( int st,const char * device,stringList_t stl )
{
printf( gettext( "ERROR: Device \"%s\" is not a luks device\n" ),device ) ;
StringListClearDelete( &stl ) ;
return st ;
}
int zuluCryptEXERemoveKey( const struct_opts * opts,uid_t uid )
{
int ask_confirmation = opts->ask_confirmation ;
const char * device = opts->device ;
const char * keyType = opts->key_source ;
const char * keytoremove = opts->key ;
int key_slot = opts->luks_slot_number ;
stringList_t stl = StringListInit() ;
string_t * pass = StringListAssign( stl ) ;
string_t * confirm = StringListAssign( stl ) ;
int status = 0 ;
const char * key ;
size_t key_size ;
/*
* zuluCryptPartitionIsSystemPartition() is defined in ./partitions.c
*/
if( zuluCryptPartitionIsSystemPartition( device,uid ) ){
if( zuluCryptExeOriginalUserIsNotRoot() ){
if( !zuluCryptUserIsAMemberOfAGroup( uid,"zulucrypt" ) ){
return zuluExit( 4,stl ) ;
}
}
}
/*
* zuluCryptCanOpenPathForWriting is defined in path_access.c
*/
status = zuluCryptCanOpenPathForWriting( device,uid ) ;
/*
* 1-permissions denied
* 2-invalid path
* 3-shenanigans
* 4-common error
*/
switch( status ){
case 0 : break ;
case 1 : return zuluExit( 5,stl ) ;
case 2 : return zuluExit( 5,stl ) ;
case 3 : return zuluExit( 5,stl ) ;
case 4 : return zuluExit( 5,stl ) ;
default: return zuluExit( 5,stl ) ;
}
if( _zuluCryptExECheckEmptySlots( device ) == 3 ){
if( ask_confirmation ){
printf( gettext( "WARNING: There is only one key in the volume and all data in it will be lost if you continue.\n" ) ) ;
printf( gettext( "Do you still want to continue? Type \"YES\" if you do: " ) ) ;
*confirm = StringGetFromTerminal_1( 3 ) ;
if( *confirm == StringVoid ){
return zuluExit( 6,stl ) ;
}
if( !StringsAreEqual_2( *confirm,gettext( "YES" ) ) ){
return zuluExit( 7,stl ) ;
}
}
}
if( keyType == NULL ){
printf( gettext( "Enter a key to be removed: " ) ) ;
/*
* ZULUCRYPT_KEY_MAX_SIZE is set in ../constants.h
*/
switch( StringSilentlyGetFromTerminal_1( pass,ZULUCRYPT_KEY_MAX_SIZE ) ){
case 1 : return zuluExit( 8,stl ) ;
case 2 : return zuluExit( 9,stl ) ;
}
printf( "\n" ) ;
key = StringContent( *pass ) ;
key_size = StringLength( *pass ) ;
zuluCryptSecurityLockMemory_1( *pass ) ;
}else{
if( keyType == NULL || keytoremove == NULL ){
return zuluExit( 10,stl ) ;
}
if( StringsAreEqual( keyType,"-f" ) ){
/*
* zuluCryptGetPassFromFile() is defined at path_access.c"
*/
switch( zuluCryptGetPassFromFile( NULL,keytoremove,uid,pass ) ){
case 1 : return zuluExit( 11,stl ) ;
case 2 : return zuluExit( 12,stl ) ;
case 4 : return zuluExit( 13,stl ) ;
case 5 : return zuluExit( 14,stl ) ;
}
key = StringContent( *pass ) ;
key_size = StringLength( *pass ) ;
zuluCryptSecurityLockMemory_1( *pass ) ;
}else if( StringsAreEqual( keyType, "-p" ) ){
key = keytoremove ;
key_size = StringSize( keytoremove ) ;
}else{
return zuluExit( 10,stl ) ;
}
}
zuluCryptSecurityGainElevatedPrivileges() ;
/*
* zuluCryptRemoveKey() is defined in ../lib/remove_key.c
*/
status = zuluCryptRemoveKey_0( device,key,key_size,key_slot ) ;
zuluCryptSecurityDropElevatedPrivileges() ;
if( status == 1 ){
status = zuluExit_1( status,device,stl ) ;
}else{
status = zuluExit( status,stl ) ;
}
/*
* zuluCryptCheckInvalidKey() is defined in check_invalid_key.c
*/
zuluCryptCheckInvalidKey( opts->device ) ;
return status ;
}
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