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CustomIdentity

, 17 May 2007
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Customize Identity, Custom Principal with ADS

Introduction

In this application, Windows identity and Windows principal object are customized to fit the Web environment. The IsInRole method of Identity and Principal are customized to check the User role list from the database .The Page/Component wise security is also provided in a simple way.

In case people in the LAN (same Domain) want access to some intranet sites, then for authentication you need not have to maintain any Login Table to store the login details such as ID, Password, EmailId, etc. You can use your workstation login id and password as the login credentials. The login credentials will query the LDAP and return your IdentityCode ["Cn"] property which can be sent to your RMS database and get the logged in users information to the page.

How Does this Application Work?

There are two classes CustomIdentity and CustomPrincipal which customize the IPrincipal and IIdentity class respectively.

CustomIdentity

  • Place the properties for logged user (whatever you think is needed regarding the logged in user)
  • IsInRole method will return whether the logged user role exists in the role list container or not?
  • IsRoleURL method will tell whether the logged user role has access to the requested pages/Business Component?
GetIdentity Method

This returns CustomIdentity object filled with the logged user data.

  • This method takes the domain UserId and Password as parameters and verifies with the ADS.
  • If logged user is present in the domain, then his identity code will be returned from the ADS.
  • Pass this identity code to the database and get the user information and bind to the properties of the CustomIdentity object.
  • Return the CustomIdentity object.
UnauthenticatedIdentity Method
  • It returns a new empty CustomIdentity object which can be called when the user signs out.
  • The above mentioned are internal methods which will be called through the CustomPrincipal class.

CustomPrincipal

  • IsInRole and IsRoleURL methods call CustomIdentity's IsInRole and IsRoleURL methods respectively.
  • IsRoleURL method will tell whether the logged user role has access to requested pages/Business Component?
  • AuthenticateUser calls GetIdentity of CustomIdentity and returns customprincipal.
  • This customprincipal object is set as the current context user.
  • SignOut calls UnauthenticatedIdentity method of Identity.

The below mentioned classes are used in the demo project.

DataCache

Used for caching the data and persist till the end of the application. Add to cache and retrieve cache methods are used to store and retrieve data from the cache.

UIBase

Set this as a pagebase class for all web.UI.Pages. In the pageload event, check the existence of requested URL's access for that role.

LoginAuthendicationWithADS
  • On Application Start, fetch the Roles And URLs from database and put it in cache.
  • On session start, the LoggedIn data in Session is set to "NO".
  • Enter the domain userid and password and click Go.
  • In this event, you call the CustomPrincipal AuthenticateUser method to get the user details.
  • If user is authenticated, then LoggedIn data in Session is set to "YES".

Using the Code

DataBase

Blocks of code should be set as style "Formatted" like this:

//
//
--Sample DataBase Script:
--(to Run this application)
GO
CREATE TABLE [transact].[URL_Master](
[URLID] [int] NOT NULL,
[URLName] [varchar](500) NOT NULL,
) ON [PRIMARY]
GO
CREATE TABLE [transact].[RoleMaster](
[RoleId] int NOT NULL,
[RoleName] [varchar](50) NOT NULL
) ON [PRIMARY]
GO
CREATE TABLE [transact].[User](
[identityCode] [int] NOT NULL,
[Name] [varchar](50) NOT NULL,
[Details] [varchar](500) NULL,
[D_O_J] [datetime] NULL,
) ON [PRIMARY]
GO
CREATE TABLE [transact].[User_URL_Role](
[URLID] [int] NOT NULL ,
[RoleID] [int] NOT NULL
) ON [PRIMARY]
GO
CREATE TABLE [transact].[UserRole](
[IdentityCode] [varchar](10) NOT NULL,
[RoleID] [int] NULL
) ON [PRIMARY]
GO
//

UILayer

Here call the AuthenicateUser method of CustomPrincipal:

if (CustomPrincipal.AuthenticateUser(UserID, UserPwd))
{
// Success, so we can access web site details.
if (HttpContext.Current.Session["LoggedIn"] == null)
{
HttpContext.Current.Session.Add("LoggedIn", "Yes");
}
else
HttpContext.Current.Session["LoggedIn"] = "Yes";
isLoggedIn = true;
}

CustomPrincipal Class

Set this CustomPrincipal object as the CurrentContext user:

#region User Property
/// <summary>
/// Get or set the current <see cref="IPrincipal" />
/// object representing the user's identity.
/// </summary>
/// <remarks>
/// When running under IIS the HttpContext.Current.User value
/// is used, otherwise the current Thread.CurrentPrincipal
/// value is used.
/// </remarks>
public static IPrincipal User
{
set
{
if (HttpContext.Current != null)
HttpContext.Current.User = value;
Thread.CurrentPrincipal = value;
}
}
#endregion

This method calls the GetIdentity method of CustomIdentity:

#region Methods
public static bool AuthenticateUser(string UserID, string UserPwd)
{
// Gets the CustomIdentity after verifying with ADS and
// retrieving User info from Database
CustomIdentity objIdentity = CustomIdentity.GetIdentity(UserID, UserPwd);
//if Authenticated then set the current Context user as CustomPrincipal
if (objIdentity.IsAuthenticated)
{
objPrincipal = new CustomPrincipal(objIdentity);
User = objPrincipal;
}
return objIdentity.IsAuthenticated;
}

CustomIdentity Class

Check the UserID, Password with ADS and get the user identity code:

#region AuthedicateMe with ADS
/// <summary>
/// Get the logged in users IDcode from the ADS
/// </summary>
/// <returns>string IDcode</returns>
private static string AuthedicateMe(string UserID,string Password)
{
//System.Configuration.ConfigurationManager.AppSettings["serverpath"].ToString()
string DN = System.Configuration.ConfigurationManager.AppSettings
					["DomainName"].ToString();
string strLDPPath = "LDAP://" + DN;
string strEntryPath = "(&(objectClass=user)(anr=" + UserID + "))";
try
{
//provides easy access to active directory from managed code
DirectoryEntry rootEntry = new DirectoryEntry
	(strLDPPath, DN + "\\" + UserID, Password);
// DirectoryEntry rootEntry =
// new DirectoryEntry(null, "WDE" + "\\" + UserID, Password);
//DirectoryEntry Class can be used to authenticate a
//username and password against active directory.
//You can force authentication to occur by retrieving the nativeObject property.
// Bind to the native object to force authentication to happen
Object objnative = rootEntry.NativeObject;
// "User authenticated" Move to the next page.
//Directory Searcher: perform queries against the active directory hierarchy
DirectorySearcher objDSearch = new DirectorySearcher(rootEntry);
objDSearch.SearchScope = SearchScope.Subtree;
objDSearch.Filter = strEntryPath;
objDSearch.PropertiesToLoad.Add("cn");
objDSearch.PageSize = 5;
objDSearch.ServerTimeLimit = new TimeSpan(0, 10, 0);
objDSearch.ClientTimeout = new TimeSpan(0, 10, 0);
SearchResult queryResults = objDSearch.FindOne();
if (queryResults != null)
{
// string PasswordString = System.Text.Encoding.Default.GetString
// ((Byte[])queryResults.Properties["userPassword"][0]);
return queryResults.Properties["cn"][0].ToString();
}
else
{
return string.Empty;
}
}
catch (Exception ex)
{
throw new Exception("Invalid password/UserID.Please Try again", ex);
}
}

#endregion

Pass this user identity code to the database and get the UserInfo. Set this information in appropriate properties of the identity class:

#region AuthenticateandAuthorizeMe
/// <summary>
/// Retrieves the Get UserInfo from the
/// </summary>
/// <returns></returns>
private static CustomIdentity AuthenticateandAuthorizeMe(string UserID, string Password)
{
try
{
PortalIdentity = new CustomIdentity();
//gets Identity code from LDAP
strIdcode = AuthedicateMe(UserID, Password);
try
{
// Get User Data
Common comm = new Common();
DbDataReader dreader = comm.GetLoggedUserData(strIdcode);
//Set the values to the Custom Identity's Properties
if (dreader.HasRows)
{
PortalIdentity.blnIsAuthenticated = true;
while (dreader.Read())
{
PortalIdentity.strIDcode = strIdcode;
PortalIdentity.strName = dreader["Name"].ToString();
PortalIdentity.strUserRole = dreader["RoleName"].ToString();
PortalIdentity.strUserRoleId = dreader["Roleid"].ToString();
if (dreader["D_O_J"] != null && dreader["D_O_J"] != DBNull.Value
&& (!string.IsNullOrEmpty(dreader["D_O_J"].ToString())))
PortalIdentity.dtRegisterDate = Convert.ToDateTime(dreader["D_O_J"].ToString());
if (dtRoleURL != null)
{
//Bind the URL to a list Container
foreach (DataRow drow in dtRoleURL.Select
	("RoleName= '" + PortalIdentity.strUserRole +"'"))
{
PortalIdentity.lstUrl.Add(drow["URLName"].ToString());
}
}
PortalIdentity.lstRoleURL.Add(PortalIdentity.strUserRole, PortalIdentity.lstUrl);
}

The customidentity class will expose the properties publicly, but not the method. All methods are internal to the library. They are exposed through the customprincipal class.

Conclusion

The above application helps you in customizing your current context user object.

History

  • 17th May, 2007: Initial post

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Anandhi Swamy
Architect
India India
No Biography provided

Comments and Discussions

 
Generalthis doesn't seem to work. PinmemberShane Blake31-Jul-08 10:14 

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