578 lines
21 KiB
C#
578 lines
21 KiB
C#
/***********************************************************************
|
|
*
|
|
* Copyright (C) 2005-2006 Novell, Inc. Inc. All Rights Reserved.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; version 2.1
|
|
* of the License.
|
|
*
|
|
* This library 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
|
|
* Library Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, Novell, Inc.
|
|
*
|
|
* To contact Novell about this file by physical or electronic mail,
|
|
* you may find current contact information at www.novell.com.
|
|
*
|
|
***********************************************************************/
|
|
|
|
using System;
|
|
using System.IO;
|
|
using System.Text;
|
|
using System.Security.Cryptography;
|
|
using sscs.common;
|
|
using sscs.constants;
|
|
|
|
namespace sscs.crypto
|
|
{
|
|
public class CASACrypto
|
|
{
|
|
|
|
private const int SALTSIZE = 64;
|
|
private const int ITERATION_COUNT = 1000;
|
|
|
|
internal static byte[] Generate16ByteKeyFromString(string sTheString)
|
|
{
|
|
byte[] baKey = new byte[16]; //return value
|
|
try
|
|
{
|
|
Rfc2898DeriveBytes pkcs5 = new Rfc2898DeriveBytes(sTheString, SALTSIZE, ITERATION_COUNT);
|
|
baKey = pkcs5.GetBytes(16);
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
CSSSLogger.ExpLog(e.ToString());
|
|
CSSSLogger.DbgLog("Key generation failed");
|
|
baKey = null;
|
|
}
|
|
return baKey;
|
|
}
|
|
|
|
internal static bool StoreKeySetUsingMasterPasscode(byte[] key,
|
|
byte[] IV, byte[] baMasterPasscode, string fileName)
|
|
{
|
|
bool bRet = false;
|
|
FileStream fsEncrypt = null;
|
|
CryptoStream csEncrypt = null;
|
|
try
|
|
{
|
|
|
|
//Get an encryptor.
|
|
RijndaelManaged myRijndael = new RijndaelManaged();
|
|
ICryptoTransform encryptor;
|
|
encryptor = myRijndael.CreateEncryptor(baMasterPasscode, baMasterPasscode);
|
|
|
|
//Encrypt the data to a file
|
|
fsEncrypt = new FileStream(fileName, FileMode.Create);
|
|
#if LINUX
|
|
Mono.Unix.Native.Syscall.chmod(fileName,Mono.Unix.Native.FilePermissions.S_IRUSR | Mono.Unix.Native.FilePermissions.S_IWUSR);
|
|
#endif
|
|
// make hidden
|
|
File.SetAttributes(fileName, FileAttributes.Hidden);
|
|
|
|
SHA256 sha = new SHA256Managed();
|
|
byte[] hash = sha.ComputeHash(key);
|
|
|
|
fsEncrypt.Write(hash,0,hash.Length);
|
|
fsEncrypt.Flush();
|
|
|
|
csEncrypt = new CryptoStream(fsEncrypt, encryptor, CryptoStreamMode.Write);
|
|
|
|
//Write all data to the crypto stream and flush it.
|
|
csEncrypt.Write(key, 0, key.Length);
|
|
csEncrypt.FlushFinalBlock();
|
|
bRet = true;
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
CSSSLogger.ExpLog(e.ToString());
|
|
CSSSLogger.DbgLog("Unable to store the generated key");
|
|
bRet = false;
|
|
}
|
|
if( fsEncrypt != null )
|
|
fsEncrypt.Close();
|
|
if( csEncrypt != null )
|
|
csEncrypt.Close();
|
|
return bRet;
|
|
}
|
|
|
|
internal static byte[] GetKeySetFromFile(byte[] baMasterPasscode,
|
|
string fileName )
|
|
{
|
|
byte[] baSavedKey = null;
|
|
FileStream fsDecrypt = null;
|
|
CryptoStream csDecrypt = null;
|
|
try
|
|
{
|
|
if(!File.Exists(fileName))
|
|
{
|
|
return null;
|
|
}
|
|
|
|
/* Get a decryptor that uses the same key and IV
|
|
* as the encryptor.
|
|
*/
|
|
|
|
RijndaelManaged myRijndael = new RijndaelManaged();
|
|
ICryptoTransform decryptor = myRijndael.CreateDecryptor(baMasterPasscode, baMasterPasscode);
|
|
//Now decrypt
|
|
fsDecrypt = new FileStream(fileName, FileMode.Open);
|
|
|
|
byte[] storedHash = new byte[32];
|
|
fsDecrypt.Read(storedHash,0,storedHash.Length);
|
|
|
|
csDecrypt = new CryptoStream(fsDecrypt, decryptor, CryptoStreamMode.Read);
|
|
baSavedKey = new byte[32];
|
|
|
|
//Read the data out of the crypto stream.
|
|
csDecrypt.Read(baSavedKey, 0, baSavedKey.Length);
|
|
|
|
SHA256 sha = new SHA256Managed();
|
|
byte[] newHash = sha.ComputeHash(baSavedKey);
|
|
for( int i = 0 ; i < 32; i++ )
|
|
{
|
|
if(storedHash[i] != newHash[i])
|
|
{
|
|
CSSSLogger.DbgLog("Hash doesnot match");
|
|
fsDecrypt.Close();
|
|
csDecrypt.Close();
|
|
return null;
|
|
}
|
|
}
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
CSSSLogger.ExpLog(e.ToString());
|
|
CSSSLogger.DbgLog("Unable to get the stored key");
|
|
baSavedKey = null;
|
|
}
|
|
if ( fsDecrypt != null )
|
|
fsDecrypt.Close();
|
|
|
|
if( csDecrypt != null )
|
|
csDecrypt.Close();
|
|
return baSavedKey;
|
|
}
|
|
|
|
internal static void EncryptDataAndWriteToFile(byte[] xmlData,
|
|
byte[] key, string fileName)
|
|
{
|
|
FileStream fsEncrypt = null;
|
|
CryptoStream csEncrypt = null;
|
|
try
|
|
{
|
|
byte[] IV = new byte[16];
|
|
for(int z = 0 ; z < 16; z++ )
|
|
IV[z] = key[z];
|
|
|
|
//Get an encryptor.
|
|
RijndaelManaged myRijndael = new RijndaelManaged();
|
|
ICryptoTransform encryptor = myRijndael.CreateEncryptor(key, IV);
|
|
|
|
//Encrypt the data to a file
|
|
fsEncrypt = new FileStream(fileName, FileMode.Create);
|
|
#if LINUX
|
|
Mono.Unix.Native.Syscall.chmod(fileName,Mono.Unix.Native.FilePermissions.S_IRUSR | Mono.Unix.Native.FilePermissions.S_IWUSR);
|
|
#endif
|
|
// make hidden
|
|
File.SetAttributes(fileName, FileAttributes.Hidden);
|
|
|
|
SHA256 sha = new SHA256Managed();
|
|
|
|
byte[] hash = sha.ComputeHash(xmlData);
|
|
|
|
fsEncrypt.Write(hash,0,hash.Length);
|
|
fsEncrypt.Flush();
|
|
|
|
csEncrypt = new CryptoStream(fsEncrypt, encryptor, CryptoStreamMode.Write);
|
|
|
|
//Write all data to the crypto stream and flush it.
|
|
csEncrypt.Write(xmlData, 0, xmlData.Length);
|
|
csEncrypt.FlushFinalBlock();
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
CSSSLogger.ExpLog(e.ToString());
|
|
CSSSLogger.DbgLog("Encrypting and storing to file failed.");
|
|
}
|
|
if( fsEncrypt != null )
|
|
fsEncrypt.Close();
|
|
if( csEncrypt != null )
|
|
csEncrypt.Close();
|
|
}
|
|
|
|
internal static byte[] ReadFileAndDecryptData(byte[] key,
|
|
string fileName)
|
|
{
|
|
FileStream fsDecrypt = null;
|
|
CryptoStream csDecrypt = null;
|
|
try
|
|
{
|
|
byte[] IV = new byte[16];
|
|
for(int z = 0 ; z < 16; z++ )
|
|
IV[z] = key[z];
|
|
|
|
//Get a decryptor that uses the same key and IV as the encryptor.
|
|
RijndaelManaged myRijndael = new RijndaelManaged();
|
|
ICryptoTransform decryptor = myRijndael.CreateDecryptor(key, IV);
|
|
if(!File.Exists(fileName))
|
|
{
|
|
return null;
|
|
}
|
|
|
|
//Now decrypt
|
|
fsDecrypt = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
|
|
byte[] storedHash = new byte[32];
|
|
fsDecrypt.Read(storedHash,0,storedHash.Length);
|
|
|
|
csDecrypt = new CryptoStream(fsDecrypt, decryptor, CryptoStreamMode.Read);
|
|
long fileLen = fsDecrypt.Length - 32;
|
|
byte[] fromEncrypt = new byte[fileLen];
|
|
|
|
//Read the data out of the crypto stream.
|
|
int bytesRead = csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);
|
|
byte[] tmpEncrypt = new byte[bytesRead];
|
|
for(int i = 0 ; i < bytesRead; i++ )
|
|
tmpEncrypt[i] = fromEncrypt[i];
|
|
|
|
SHA256 sha = new SHA256Managed();
|
|
byte[] newHash = sha.ComputeHash(tmpEncrypt);
|
|
|
|
for( int i = 0 ; i < 32; i++ )
|
|
{
|
|
if(storedHash[i] != newHash[i])
|
|
{
|
|
CSSSLogger.DbgLog("Hash doesnot match");
|
|
fsDecrypt.Close();
|
|
csDecrypt.Close();
|
|
return null;
|
|
}
|
|
}
|
|
|
|
fsDecrypt.Close();
|
|
csDecrypt.Close();
|
|
return tmpEncrypt;
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
Console.WriteLine(e.ToString());
|
|
}
|
|
if( fsDecrypt != null )
|
|
{
|
|
fsDecrypt.Close();
|
|
}
|
|
if( csDecrypt != null )
|
|
{
|
|
csDecrypt.Close();
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/* The methods EncryptData() and DecryptData() would be
|
|
* required when we use a database to store secrets.
|
|
*/
|
|
|
|
/* Encrypts the data with the key and returns the encrypted buffer.
|
|
*/
|
|
|
|
internal static byte[] EncryptData(byte[] data, byte[] key)
|
|
{
|
|
|
|
try
|
|
{
|
|
byte[] IV = new byte[16];
|
|
int i = 0;
|
|
for(i = 0 ; i < 16; i++ )
|
|
IV[i] = key[i];
|
|
|
|
//Get an encryptor.
|
|
RijndaelManaged myRijndael = new RijndaelManaged();
|
|
ICryptoTransform encryptor = myRijndael.CreateEncryptor(key, IV);
|
|
MemoryStream ms1 = new MemoryStream();
|
|
CryptoStream csEncrypt = new CryptoStream(ms1, encryptor, CryptoStreamMode.Write);
|
|
|
|
//Write all data to the crypto stream and flush it.
|
|
csEncrypt.Write(data, 0, data.Length);
|
|
csEncrypt.FlushFinalBlock();
|
|
return ms1.ToArray();
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
CSSSLogger.ExpLog(e.ToString());
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/* Decrypts the buffer(encrypted) with the key and returns the
|
|
* decrypted data.
|
|
*/
|
|
|
|
internal static byte[] DecryptData(byte[] buffer, byte[] key)
|
|
{
|
|
try
|
|
{
|
|
byte[] IV = new byte[16];
|
|
for(int i = 0 ; i < 16; i++ )
|
|
IV[i] = key[i];
|
|
//Get a decryptor that uses the same key and IV as the encryptor.
|
|
RijndaelManaged myRijndael = new RijndaelManaged();
|
|
ICryptoTransform decryptor = myRijndael.CreateDecryptor(key, IV);
|
|
MemoryStream ms1 = new MemoryStream(buffer);
|
|
CryptoStream csDecrypt = new CryptoStream(ms1, decryptor, CryptoStreamMode.Read);
|
|
byte[] fromEncrypt = new byte[buffer.Length];
|
|
//Read the data out of the crypto stream.
|
|
csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);
|
|
return fromEncrypt;
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
CSSSLogger.ExpLog(e.ToString());
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/* This method checks if we can get the master passcode by
|
|
* decrypting the passwds file ( where we store all possible
|
|
* passwds cross-encrypted.
|
|
*
|
|
* TBD : As we are storing master passcode and the keys in 2
|
|
* different files, we need to take care of cases when 1 of the files
|
|
* is deleted.
|
|
*/
|
|
|
|
internal static bool CheckIfMasterPasscodeIsAvailable(string desktopPasswd, string fileName)
|
|
{
|
|
return (File.Exists(fileName));
|
|
}
|
|
|
|
internal static byte[] GetMasterPasscode(string desktopPasswd, string fileName)
|
|
{
|
|
byte[] mp = DecryptMasterPasscodeUsingString(desktopPasswd, fileName);
|
|
return mp;
|
|
}
|
|
|
|
/* TBD - There must be a way, where we establish the integrity of
|
|
* the files where we store the keys and master passcode.
|
|
* Use a marker ?
|
|
*/
|
|
|
|
// Used to save the MasterPasscode encrypted with Desktop login, etc
|
|
internal static void EncryptAndStoreMasterPasscodeUsingString(
|
|
byte[] baMasterPasscode,
|
|
string passwd,
|
|
string fileName)
|
|
{
|
|
FileStream fsEncrypt = null;
|
|
CryptoStream csEncrypt = null;
|
|
try
|
|
{
|
|
if(File.Exists(fileName))
|
|
File.Delete(fileName);
|
|
byte[] baKey = Generate16ByteKeyFromString(passwd);
|
|
|
|
|
|
//Get an encryptor.
|
|
RijndaelManaged myRijndael = new RijndaelManaged();
|
|
ICryptoTransform encryptor;
|
|
encryptor = myRijndael.CreateEncryptor(baKey, baKey);
|
|
|
|
//Encrypt the data to a file
|
|
fsEncrypt = new FileStream(fileName,FileMode.Create);
|
|
#if LINUX
|
|
Mono.Unix.Native.Syscall.chmod(fileName,Mono.Unix.Native.FilePermissions.S_IRUSR | Mono.Unix.Native.FilePermissions.S_IWUSR);
|
|
#endif
|
|
// make hidden
|
|
File.SetAttributes(fileName, FileAttributes.Hidden);
|
|
|
|
csEncrypt = new CryptoStream(fsEncrypt, encryptor,
|
|
CryptoStreamMode.Write);
|
|
|
|
//Write all data to the crypto stream and flush it.
|
|
|
|
csEncrypt.Write(baMasterPasscode, 0, baMasterPasscode.Length);
|
|
csEncrypt.FlushFinalBlock();
|
|
fsEncrypt.Close();
|
|
csEncrypt.Close();
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
CSSSLogger.ExpLog(e.ToString());
|
|
}
|
|
if( fsEncrypt != null )
|
|
{
|
|
fsEncrypt.Close();
|
|
}
|
|
if( csEncrypt != null )
|
|
{
|
|
csEncrypt.Close();
|
|
}
|
|
}
|
|
|
|
public static byte[] DecryptMasterPasscodeUsingString(string passwd,
|
|
string fileName)
|
|
{
|
|
FileStream fsDecrypt = null;
|
|
CryptoStream csDecrypt = null;
|
|
byte[] baSavedMasterPasscode = null;
|
|
try
|
|
{
|
|
byte[] baKey = Generate16ByteKeyFromString(passwd);
|
|
|
|
/* Get a decryptor that uses the same key and
|
|
* IV as the encryptor.
|
|
*/
|
|
RijndaelManaged myRijndael = new RijndaelManaged();
|
|
ICryptoTransform decryptor = myRijndael.CreateDecryptor(baKey,
|
|
baKey);
|
|
//Now decrypt
|
|
fsDecrypt = new FileStream(fileName, FileMode.Open);
|
|
csDecrypt = new CryptoStream(fsDecrypt, decryptor,
|
|
CryptoStreamMode.Read);
|
|
baSavedMasterPasscode = new byte[16];
|
|
|
|
//Read the data out of the crypto stream.
|
|
csDecrypt.Read(baSavedMasterPasscode, 0, 16);
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
CSSSLogger.ExpLog(e.ToString());
|
|
CSSSLogger.DbgLog("Unable to decrypt master passode");
|
|
baSavedMasterPasscode = null;
|
|
}
|
|
if( fsDecrypt != null )
|
|
fsDecrypt.Close();
|
|
if( csDecrypt != null )
|
|
csDecrypt.Close();
|
|
return baSavedMasterPasscode;
|
|
}
|
|
|
|
internal static byte[] GetMasterPasscodeUsingMasterPasswd(
|
|
string mPasswd,
|
|
string fileName)
|
|
{
|
|
byte[] baMasterPasscode;
|
|
try
|
|
{
|
|
if(File.Exists(fileName))
|
|
{
|
|
/* Decrypt the passcode from the file using master passwd.
|
|
* and return the decrypted passcode.
|
|
*/
|
|
baMasterPasscode = DecryptMasterPasscodeUsingString(mPasswd,
|
|
fileName);
|
|
return baMasterPasscode;
|
|
}
|
|
else
|
|
return null;
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
CSSSLogger.ExpLog(e.ToString());
|
|
CSSSLogger.DbgLog("Failed to get master passcode from master password.");
|
|
}
|
|
return null;
|
|
}
|
|
|
|
internal static byte[] GetMasterPasscodeUsingDesktopPasswd(
|
|
string desktopPasswd,
|
|
string fileName)
|
|
{
|
|
byte[] passcode;
|
|
try
|
|
{
|
|
if(File.Exists(fileName))
|
|
{
|
|
/* Decrypt the passcode from the file using desktop passwd.
|
|
* and return the decrypted passcode.
|
|
*/
|
|
passcode = DecryptMasterPasscodeUsingString(desktopPasswd,
|
|
fileName);
|
|
return passcode;
|
|
|
|
}
|
|
else
|
|
return null;
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
CSSSLogger.ExpLog(e.ToString());
|
|
CSSSLogger.DbgLog("Failed to get master passcode using desktop passwd");
|
|
}
|
|
return null;
|
|
}
|
|
//internal static string GenerateMasterPasscodeUsingDesktopPasswd(
|
|
internal static byte[] GenerateMasterPasscodeUsingString(
|
|
string desktopPasswd,
|
|
string fileName,
|
|
string validationFile,
|
|
UserIdentifier userId
|
|
)
|
|
{
|
|
try
|
|
{
|
|
byte[] baPasscode;
|
|
// use AES to generate a random 16 byte key;
|
|
RijndaelManaged myRijndael = new RijndaelManaged();
|
|
myRijndael.KeySize = 128;
|
|
//Create a new key and initialization vector.
|
|
myRijndael.GenerateKey();
|
|
baPasscode = myRijndael.Key;
|
|
|
|
EncryptAndStoreMasterPasscodeUsingString(baPasscode,
|
|
desktopPasswd,
|
|
fileName);
|
|
EncryptDataAndWriteToFile(
|
|
Encoding.Default.GetBytes(
|
|
ConstStrings.MICASA_VALIDATION_STRING),
|
|
baPasscode,
|
|
validationFile);
|
|
return baPasscode;
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
CSSSLogger.ExpLog(e.ToString());
|
|
CSSSLogger.DbgLog("Generation of master passcode failed.");
|
|
}
|
|
return null;
|
|
}
|
|
|
|
public static bool ValidatePasscode(byte[] baPasscode, string fileName)
|
|
{
|
|
/* Here we decrpyt a well known string, throw exception
|
|
* if not successful
|
|
* A well-known string is encrpyted by the Passcode and saved
|
|
*/
|
|
|
|
if ((baPasscode == null) || baPasscode.Length < 1 )
|
|
return false;
|
|
|
|
try
|
|
{
|
|
byte[] baString = ReadFileAndDecryptData(baPasscode, fileName);
|
|
string sString = Encoding.Default.GetString(baString);
|
|
char[] trimChars = {'\0'};
|
|
sString = sString.TrimEnd(trimChars);
|
|
if( ConstStrings.MICASA_VALIDATION_STRING.Equals(sString))
|
|
{
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
catch(Exception e)
|
|
{
|
|
CSSSLogger.ExpLog(e.ToString());
|
|
CSSSLogger.DbgLog("Validation of passcode failed.");
|
|
}
|
|
return false;
|
|
}
|
|
|
|
}
|
|
}
|