433 lines
16 KiB
C#
433 lines
16 KiB
C#
using System;
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using System.IO;
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using System.Text;
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using System.Collections;
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using System.Threading;
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using System.Security.Cryptography;
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using System.Xml;
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using sscs.cache;
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using sscs.crypto;
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using sscs.common;
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using sscs.constants;
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using Novell.CASA.MiCasa.Common;
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namespace sscs.lss
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{
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/// <summary>
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/*
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* This class is a service to store data persistently.
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* How it does this is determined by implementation within the
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* private methods (File system using file(s), database, etc)
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* The MasterPasscode can be used to generate the key for
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* encyption and decryption.
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* If encrpytion is used, the private methods will also manage
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* how the encyption key is to be stored and retrieved.
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* Each piece of data is located by a DataID.
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* This might be an individual credentail or
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* a complete store.
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*/
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/* We might not need this as a separate class.
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* Depending on the db changes, we can change this later.
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*/
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/// </summary>
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public class LocalStorage
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{
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private byte[] m_baGeneratedKey = null;
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private SecretStore userStore = null;
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private int persistThreadSleepTime = 1000 * 60 * 5; //1000 * 30;
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private Thread persistThread = null;
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private static string LINUXID = "Unix";
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internal LocalStorage(SecretStore store,byte[] baMasterPasscode)
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{
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userStore = store;
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m_baGeneratedKey = baMasterPasscode;
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LoadPersistentStore();
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userStore.DumpSecretstore();
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}
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~LocalStorage()
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{
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if(persistThread != null)
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{
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persistThread.Abort();
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persistThread.Join();
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}
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}
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// allowing a user to choose the storage location is not approved yet
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private LocalStorage(SecretStore store,
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byte[] baMasterPasscode, string sStorageDirectory)
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{
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userStore = store;
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m_baGeneratedKey = baMasterPasscode;
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LoadPersistentStore();
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userStore.DumpSecretstore();
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}
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private void StorePersistentData(string sDataID, byte[] baData)
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{
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}
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private byte[] RetrievePersistentData(string sDataID)
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{
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return null;
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}
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public void PersistStoreWithDelay()
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{
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if (persistThread == null)
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{
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persistThread = new Thread(new ThreadStart(PersistStoreDelayThreadFn));
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persistThread.Start();
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}
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}
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public bool StopPersistence()
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{
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if(persistThread != null)
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{
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persistThread.Abort();
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persistThread.Join();
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}
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return true;
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}
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private string GetDecryptedXml()
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{
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try
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{
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string fileName = userStore.GetPersistenceFilePath();
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if(!File.Exists(fileName))
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{
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// check for tmp file
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if (File.Exists(fileName+".tmp"))
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File.Move(fileName+".tmp", fileName);
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else
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return null;
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}
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// delete tmp file if there
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if (File.Exists(fileName+".tmp"))
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File.Delete(fileName+".tmp");
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byte[] baPasscode = null;
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if (null != m_baGeneratedKey)
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baPasscode = m_baGeneratedKey;
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else
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baPasscode = CASACrypto.GetMasterPasscode(userStore.GetDesktopPasswd(),userStore.GetPasscodeByDesktopFilePath());
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if( null == baPasscode )
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return null;
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byte[] key = CASACrypto.GetKeySetFromFile(baPasscode,userStore.GetKeyFilePath());
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if( null == key )
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return null;
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byte[] decryptedBuffer = CASACrypto.ReadFileAndDecryptData(key,fileName);
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if( null == decryptedBuffer )
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return null;
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string temp = Encoding.UTF8.GetString(decryptedBuffer, 0, decryptedBuffer.Length);
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return temp;
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}
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catch(Exception e)
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{
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CSSSLogger.ExpLog(e.ToString());
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CSSSLogger.DbgLog("Unable to get persistent store");
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}
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return null;
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}
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/* This method, uses the key to decrypt the persistent store
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* and populates userStore with the persistent data.
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*/
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private bool LoadPersistentStore()
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{
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try
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{
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string xpath = "";
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XmlDocument doc = new XmlDocument();
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string xmlToLoad = GetDecryptedXml();
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if(xmlToLoad != null)
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{
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doc.LoadXml(xmlToLoad);
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#if false
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XmlTextWriter writer = new XmlTextWriter("/home/poorna/.miCASA.xml",null);
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writer.Formatting = Formatting.Indented;
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doc.Save(writer);
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writer.Close();
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#endif
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}
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else
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{
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return false;
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}
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xpath = "//" + XmlConsts.miCASANode;
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XmlNode miCASANode = doc.SelectSingleNode(xpath);
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if(miCASANode != null)
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{
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xpath = "descendant::" + XmlConsts.keyChainNode;
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XmlNodeList keyChainNodeList = miCASANode.SelectNodes(xpath);
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foreach(XmlNode node in keyChainNodeList)
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{
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XmlAttributeCollection attrColl = node.Attributes;
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string keyChainId = (attrColl[XmlConsts.idAttr]).Value + "\0";
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KeyChain keyChain = null;
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if( userStore.CheckIfKeyChainExists(keyChainId) == false )
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{
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keyChain = new KeyChain(keyChainId);
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userStore.AddKeyChain(keyChain);
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}
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else
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{
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keyChain = userStore.GetKeyChain(keyChainId);
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}
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xpath = "descendant::" + XmlConsts.secretNode;
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XmlNodeList secretNodeList = node.SelectNodes(xpath);
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foreach(XmlNode secretNode in secretNodeList)
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{
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attrColl = secretNode.Attributes;
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string secretId = (attrColl[XmlConsts.idAttr]).Value + "\0";
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xpath = "descendant::" + XmlConsts.valueNode;
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Secret secret = new Secret(secretId);
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if( keyChain.CheckIfSecretExists(secretId) == false)
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{
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keyChain.AddSecret(secret);
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XmlNode secretValNode = (secretNode.SelectSingleNode(xpath));
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xpath = "descendant::" + XmlConsts.keyNode;
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XmlNodeList keyNodeList = secretValNode.SelectNodes(xpath);
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secret = keyChain.GetSecret(secretId);
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foreach(XmlNode keyNode in keyNodeList)
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{
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attrColl = keyNode.Attributes;
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string key;
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try
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{
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key = (attrColl[XmlConsts.idAttr]).Value;
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}
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catch (Exception)
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{
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// LinkedKey node, continue
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continue;
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}
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xpath = "descendant::" + XmlConsts.keyValueNode;
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XmlNode keyValNode = keyNode.SelectSingleNode(xpath);
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string keyValue = keyValNode.InnerText;
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secret.SetKeyValue(key,keyValue);
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// add linked keys
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xpath = "descendant::" + XmlConsts.linkedKeyNode;
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XmlNodeList linkNodeList = keyNode.SelectNodes(xpath);
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foreach(XmlNode linkNode in linkNodeList)
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{
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// get TargetSecretID
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xpath = "descendant::" + XmlConsts.linkedTargetSecretNode;
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XmlNode targetSecretNode = linkNode.SelectSingleNode(xpath);
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string sSecretID = targetSecretNode.InnerText + "\0";
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// get TargetSecretKey
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xpath = "descendant::" + XmlConsts.linkedTargetKeyNode;
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XmlNode targetKeyNode = linkNode.SelectSingleNode(xpath);
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string sKeyID = targetKeyNode.InnerText;
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LinkedKeyInfo lki = new LinkedKeyInfo(sSecretID, sKeyID);
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KeyValue kv = secret.GetKeyValue(key);
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kv.AddLink(lki);
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}
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}
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}//if ends
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}
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}//end of traversing keyChainNodeList
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}
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}
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catch(Exception e)
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{
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CSSSLogger.ExpLog(e.ToString());
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}
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return true;
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}
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private void PersistStoreDelayThreadFn()
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{
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Thread.Sleep(30000);
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PersistStore();
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persistThread = null;
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}
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private void PersistStoreThreadFn()
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{
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while(true)
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{
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Thread.Sleep(persistThreadSleepTime);
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PersistStore();
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}
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}
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/* Persists the store to an xml file.
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* TBD : Would we require any form of encoding?
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*/
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internal void PersistStore()
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{
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// userStore.DumpSecretstore();
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try
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{
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MemoryStream ms1 = new MemoryStream();
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XmlTextWriter writer = new XmlTextWriter(ms1,null);
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writer.Formatting = Formatting.Indented;
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writer.WriteStartDocument();
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writer.WriteStartElement(XmlConsts.miCASANode);
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writer.WriteAttributeString(XmlConsts.versionAttr,"1.5");
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{
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IDictionaryEnumerator iter = (IDictionaryEnumerator)userStore.GetKeyChainEnumerator();
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char [] tmpId;
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string sTmpId;
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while( iter.MoveNext() )
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{
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KeyChain kc = (KeyChain)iter.Value;
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writer.WriteStartElement(XmlConsts.keyChainNode);
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string kcId = kc.GetKey();
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tmpId = new char[kcId.Length-1];
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for(int i = 0; i < kcId.Length-1; i++ )
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tmpId[i] = kcId[i];
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sTmpId = new string(tmpId);
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writer.WriteAttributeString(XmlConsts.idAttr,sTmpId);
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/* If we need to store time
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writer.WriteStartElement(XmlConsts.timeNode);
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writer.WriteAttributeString(XmlConsts.createdTimeNode,kc.CreatedTime.ToString());
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writer.WriteAttributeString(XmlConsts.modifiedTimeNode,kc.ModifiedTime.ToString());
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writer.WriteEndElement();
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*/
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IDictionaryEnumerator secIter = (IDictionaryEnumerator)(kc.GetAllSecrets());
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while(secIter.MoveNext())
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{
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Secret secret = (Secret)secIter.Value;
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writer.WriteStartElement(XmlConsts.secretNode);
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string secretId = secret.GetKey();
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tmpId = new char[secretId.Length-1];
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for(int i = 0; i < secretId.Length-1; i++ )
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tmpId[i] = secretId[i];
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sTmpId = new string(tmpId);
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writer.WriteAttributeString(XmlConsts.idAttr,sTmpId);
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/* If we need to store time
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writer.WriteStartElement(XmlConsts.timeNode);
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writer.WriteAttributeString(XmlConsts.createdTimeNode,secret.CreatedTime.ToString());
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writer.WriteAttributeString(XmlConsts.modifiedTimeNode,secret.ModifiedTime.ToString());
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writer.WriteEndElement();
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*/
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writer.WriteStartElement(XmlConsts.valueNode);
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// byte[] byteArr = secret.GetValue();
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IDictionaryEnumerator etor = (IDictionaryEnumerator)secret.GetKeyValueEnumerator();
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while(etor.MoveNext())
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{
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string sKey = (string)etor.Key;
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string value = secret.GetKeyValue(sKey).GetValue();
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writer.WriteStartElement(XmlConsts.keyNode);
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writer.WriteAttributeString(XmlConsts.idAttr, sKey);
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writer.WriteStartElement(XmlConsts.keyValueNode);
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writer.WriteString(value);
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writer.WriteEndElement();
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/* If we need to store time
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writer.WriteStartElement(XmlConsts.timeNode);
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writer.WriteAttributeString(XmlConsts.createdTimeNode,(secret.GetKeyValueCreatedTime(sKey)).ToString());
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writer.WriteAttributeString(XmlConsts.modifiedTimeNode,(secret.GetKeyValueModifiedTime(sKey)).ToString());
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writer.WriteEndElement();
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*/
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// write all LinkKeys
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Hashtable htLinkedKeys = secret.GetLinkedKeys(sKey);
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if (htLinkedKeys != null)
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{
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IDictionaryEnumerator etorLinked = (IDictionaryEnumerator)htLinkedKeys.GetEnumerator();
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while(etorLinked.MoveNext())
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{
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LinkedKeyInfo lki = (LinkedKeyInfo)etorLinked.Value;
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writer.WriteStartElement(XmlConsts.linkedKeyNode);
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writer.WriteStartElement(XmlConsts.linkedTargetSecretNode);
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writer.WriteString(lki.GetLinkedSecretID().Substring(0, lki.GetLinkedSecretID().Length-1));
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writer.WriteEndElement();
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writer.WriteStartElement(XmlConsts.linkedTargetKeyNode);
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writer.WriteString(lki.GetLinkedKeyID());
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writer.WriteEndElement();
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writer.WriteEndElement();
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}
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}
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writer.WriteEndElement();
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}
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/*
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char[] chArr = new char[byteArr.Length];
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for(int z = 0; z < byteArr.Length; z++)
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chArr[z] = (char)byteArr[z];
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string stringToStore = new string(chArr);
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writer.WriteString(stringToStore);
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*/
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writer.WriteEndElement(); //end of value node
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writer.WriteEndElement();
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}
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writer.WriteEndElement(); //keychain
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}
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}
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writer.WriteEndElement(); //miCASA node
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writer.WriteEndDocument();
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writer.Flush();
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writer.Close();
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//byte[] key = CASACrypto.GetKeySetFromFile(CASACrypto.GetMasterPasscode(userStore.GetDesktopPasswd(),userStore.GetPasscodeByDesktopFilePath()),userStore.GetKeyFilePath());
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byte[] key = CASACrypto.GetKeySetFromFile(m_baGeneratedKey, userStore.GetKeyFilePath());
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string fileName = userStore.GetPersistenceFilePath();
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// rename existing file
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if(File.Exists(fileName))
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{
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if (File.Exists(fileName+".tmp"))
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File.Delete(fileName+".tmp");
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File.Move(fileName, fileName+".tmp");
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}
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CASACrypto.EncryptDataAndWriteToFile(ms1.ToArray(),key,fileName);
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//remove temp
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if(File.Exists(fileName+".tmp"))
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{
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File.Delete(fileName+".tmp");
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}
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}
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catch(Exception e)
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{
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CSSSLogger.ExpLog(e.ToString());
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}
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}
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}
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}
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