For security reasons we want to check if the current PC user is the actual logged on user. To do this we want the user to re-enter their password and check his credentials with the domain. How could we accomplish this?
Sofar we tried this:
public static Boolean Authenticate(String password)
{
String user = WindowsIdentity.GetCurrent().Name;
using (PrincipalContext PrincipalContext = new PrincipalContext(ContextType.Domain, Environment.UserDomainName))
{
return PrincipalContext.ValidateCredentials(user, password);
}
}
But get a System.DirectoryServices.Protocols.LdapException, leaving the Environment.UserDomainName off also triggers this exception.
We also tried:
public static Boolean Authenticate(String password)
{
String user = WindowsIdentity.GetCurrent().Name;
using (PrincipalContext PrincipalContext = new PrincipalContext(ContextType.Machine))
{
return PrincipalContext.ValidateCredentials(user, password);
}
}
But this returns true on any password.
After some searching I came across this answer. Turns out the Domain name is included in WindowsIdentity.GetCurrent().Name. As found under the remarks in the documentation.
Giving this as a working solution:
public static Boolean Authenticate(String password)
{
String user = WindowsIdentity.GetCurrent().Name; //Should be: DomainName\UserName
String[] DomainAndUserName = user.Split(new Char[] { '\\' }, 2);
if (DomainAndUserName.Length != 2) { return false; } // No DomainName ==> Wrong network;
using (PrincipalContext PrincipalContext = new PrincipalContext(ContextType.Domain, DomainAndUserName[0]))
{
return PrincipalContext.ValidateCredentials(DomainAndUserName[1], password);
}
}
Related
how to retrieve gMSA account password in C#?
I need to use gMSA account to disable/enable AD account.
But I don't know how to get gMSA password?
public static bool DisableUserAccount(string sUserName)
{
UserPrincipal oUserPrincipal = GetUserForDoamin("D-Domain", sUserName);
oUserPrincipal.Enabled = false;
oUserPrincipal.Save();
return true;
}
public static UserPrincipal GetUserForDoamin(string sDomain, string sUserName)
{
PrincipalContext PrincipalDomain = null;
PrincipalDomain = GetPrincipalContext("D-Domain", "NONE"); ;
UserPrincipal oUserPrincipal = UserPrincipal.FindByIdentity(PrincipalDomain, sUserName);
return oUserPrincipal;
}
public static PrincipalContext GetPrincipalContext(string sDomainZone, string sOU)
{
PrincipalContext ServerCredentials = null;
string sDomainName = "";
sDomainName = "D-Domain";
ServerCredentials = new PrincipalContext(ContextType.Domain, sDomainName, "gMSA$", gMSApassword);
break;
return ServerCredentials;
}
At [GetPrincipalContext], gMSApassword is not nullable column. I try "" & null, but it is not working.
I don't know how to setup.
I am new to LDAP related coding and today I am asked to develop a code to check the users authentication against LDAP.
The tutorials I have found online are so simple but our company's Directory is so complicated that I don't know how to write a code for that. Here is the info of the LDAP . I have changed the company name to hide the name.
uri = ldaps://ABC.ad.XYZ.com:636
user_filter = memberOf=CN=TENXAIRFLOWPROD,OU=Security Groups,OU=Normal Users and Groups,OU=Account Management Services,OU=AD Master OU,DC=ABC,DC=ad,DC=XYZ,DC=com
user_name_attr = sAMAccountName
superuser_filter = memberOf=CN=TENXAIRFLOWPROD_ADM,OU=Security Groups,OU=Normal Users and Groups,OU=Account Management Services,OU=AD Master OU,DC=ABC,DC=ad,DC=XYZ,DC=com
bind_user = SCGLOBAL\twiki
bind_password_cmd = python /bns/tenx/airflow/ldap_password.py
basedn = DC=ABC,DC=ad,DC=XYZ,DC=com
search_scope = SUBTREE
Here is a code I have developed but it gives me error:
string username = "myUserName";
string domain = "ldaps://ABC.ad.XYZ.com:636";
string pwd = "myPasword";
try
{
DirectoryEntry entry = new DirectoryEntry(domain, username, pwd);
//Bind to the native AdsObject to force authentication.
object obj = entry.NativeObject;
lblError.Text=("Login Successful");
//search some info of this user if any
DirectorySearcher search = new DirectorySearcher(entry);
search.Filter = "(SAMAccountName=" + username + ")";
SearchResult result = search.FindOne();
}
catch (Exception ex)
{
lblError.Text=("Login failed: " + ex.ToString());
}
Could anybody help plz?
Comment: According to the admin , I have been assigned to the group in AD. But how can I make sure I can access it?
It seems like Active Directory. If so, you could just use PrincipalContext.
public bool ValidateCredentials(string domain, string username, string password)
{
using (var context = new PrincipalContext(ContextType.Domain, domain))
{
return context.ValidateCredentials(username, password);
}
}
public bool IsUserInAdGroup(string domain, string username, string adGroupName)
{
bool result = false;
using (var context = new PrincipalContext(ContextType.Domain, domain))
{
var user = UserPrincipal.FindByIdentity(context, username);
if (user != null)
{
var group = GroupPrincipal.FindByIdentity(context, adGroupName);
if (group != null && user.IsMemberOf(group))
result = true;
}
}
return result;
}
Please make sure to reference System.DirectoryServices.AccountManagement.
Before I start, I've already visited Unknown Error (0x80005000) with LDAPS Connection and changed my code and while it did solve the problem it seems that it has mysteriously come back.
Here's the good stuff:
public static bool Authenticate(string username, string password, string domain)
{
bool authentic = false;
try
{
LdapConnection con = new LdapConnection(
new LdapDirectoryIdentifier(Host, Port));
if (IsSSL)
{
con.SessionOptions.SecureSocketLayer = true;
con.SessionOptions.VerifyServerCertificate = ServerCallback;
}
con.Credential = new NetworkCredential(username, password);
con.AuthType = AuthType.Basic;
con.Bind();
authentic = true;
}
catch (LdapException)
{
return false;
}
catch (DirectoryServicesCOMException)
{ }
return authentic;
}
public static bool IsSSL
{
get
{
return ConnectionString.ToLower().Contains("ldaps");
}
}
public static string ConnectionString
{
get
{
if (string.IsNullOrEmpty(_connectionString))
_connectionString = CompleteConfiguration.GetLDAPConnectionString();
return _connectionString;
}
set { _connectionString = value; }
}
public static int Port
{
get
{
var x = new Uri(ConnectionString);
int port = 0;
if (x.Port != -1)
{
port = x.Port;
}
else
{
port = x.OriginalString.ToLower().Contains("ldaps")
? 636
: 389;
}
return port;
}
}
public static string Host
{
get
{
var x = new Uri(ConnectionString);
return x.Host;
}
}
private static bool ServerCallback(LdapConnection connection, X509Certificate certificate)
{
return true;
}
Here's the bad stuff:
When I attempt to authenticate to the application I get the following error, to be precise this is triggered by the con.Bind() line:
[COMException (0x80005000): Unknown error (0x80005000)]
System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail) +378094
System.DirectoryServices.DirectoryEntry.Bind() +36
System.DirectoryServices.DirectoryEntry.get_NativeObject() +31
Complete.Authentication.GCAuthentication.Authenticate(String username, String password, String domain) in c:\Builds\6\Idealink.Open.Pancanal\Panama Canal\Sources\Idealink.Open\Complete.Authentication\GCAuthentication.cs:27
Complete.Authentication.AuthenticationFactory.ValidateUserLdap(String username, String password, String domain, Boolean isValid, String usernameWithDomain) in c:\Builds\6\Idealink.Open.Pancanal\Panama Canal\Sources\Idealink.Open\Complete.Authentication\AuthenticationFactory.cs:93
It is quite confusing as it seems that some user accounts work and others don't. However when I place the above code in an isolated test environment it does succeed each and every time regardless of which account I use. When I place it back on the Windows 2008 R2 Server with ASP.NET and IIS it fails as stated above. The failures are consistent though - accounts consistently fail or succeed, from that perspective there is no randomness.
The LDAP Server must be accessed using LDAPS and NOT LDAP which is why we cannot use the DirectoryEntry object - the LDAP server is controlled by a client and therefore cannot be reconfigured or altered in any way. We simply want to capture username/password on a web form and then use BIND on the LDAP server to check credentials.
We are using .NET 3.5 and cannot upgrade at this time so I respectfully ask that if your main suggestion and arguments are to upgrade than please hold off on your contribution.
Thanks, hope you can help
Would something like this work for you..?
const string Domain = "ServerAddress:389";
const string constrParts = #"OU=Users,DC=domain,DC=com";
const string Username = #"karell";
PrincipalContext principalContext = new PrincipalContext(ContextType.Domain, Domain, constrParts);
UserPrincipal userPrincipal = UserPrincipal.FindByIdentity(principalContext, username);
Here is a really good site for great references and examples
DirectoryServices DirectoryEntry
for Connection over SSL you could do something like the following
const int ldapInvalidCredentialsError = 0x31;
const string server = "your_domain.com:636";
const string domain = "your_domain.com";
try
{
using (var ldapSSLConn = new LdapConnection(server))
{
var networkCredential = new NetworkCredential(username, password, domain);
ldapSSLConn.SessionOptions.SecureSocketLayer = true;
ldapSSLConn.AuthType = AuthType.Negotiate;
ldapSSLConn.Bind(networkCredential);
}
// If the bind succeeds, the credentials are valid
return true;
}
catch (LdapException ldapEx)
{
// Invalid credentials a specific error code
if (ldapEx.ErrorCode.Equals(ldapInvalidCredentialsError))
{
return false;
}
throw;
}
MSDN list of Invalid LDAP Error Codes
how to change password to user account, by c# code?
Here is a simpler way to do this, however you will need to reference System.DirectoryServices.AccountManagement from .Net 4.0
namespace PasswordChanger
{
using System;
using System.DirectoryServices.AccountManagement;
class Program
{
static void Main(string[] args)
{
ChangePassword("domain", "user", "oldpassword", "newpassword");
}
public static void ChangePassword(string domain, string userName, string oldPassword, string newPassword)
{
try
{
using (var context = new PrincipalContext(ContextType.Domain, domain))
using (var user = UserPrincipal.FindByIdentity(context, IdentityType.SamAccountName, userName))
{
user.ChangePassword(oldPassword, newPassword);
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
}
}
Using active directory:
// Connect to Active Directory and get the DirectoryEntry object.
// Note, ADPath is an Active Directory path pointing to a user. You would have created this
// path by calling a GetUser() function, which searches AD for the specified user
// and returns its DirectoryEntry object or path. See http://www.primaryobjects.com/CMS/Article61.aspx
DirectoryEntry oDE;
oDE = new DirectoryEntry(ADPath, ADUser, ADPassword, AuthenticationTypes.Secure);
try
{
// Change the password.
oDE.Invoke("ChangePassword", new object[]{strOldPassword, strNewPassword});
}
catch (Exception excep)
{
Debug.WriteLine("Error changing password. Reason: " + excep.Message);
}
Here you have example to change it in the local user account:
http://msdn.microsoft.com/en-us/library/ms817839
Other alternative could be using interoperability and call unmanaged code: netapi32.dll
http://msdn.microsoft.com/en-us/library/aa370650(VS.85).aspx
DirectoryEntry AD = new DirectoryEntry("WinNT://" + Environment.MachineName + ",computer");
DirectoryEntry grp;
grp = AD.Children.Find("test", "user");
if (grp != null)
{
grp.Invoke("SetPassword", new object[] { "test" });
}
grp.CommitChanges();
MessageBox.Show("Account Change password Successfully");
"run in administrator to change all user
This works for both AD and Local Accounts.
If you want to invoke this API via C#, you may use this signature to import API NetUserChangePassword to your C# code:
[DllImport("netapi32.dll", CharSet=CharSet.Unicode, CallingConvention=CallingConvention.StdCall,SetLastError=true )]
static extern uint NetUserChangePassword (
[MarshalAs(UnmanagedType.LPWStr)] string domainname,
[MarshalAs(UnmanagedType.LPWStr)] string username,
[MarshalAs(UnmanagedType.LPWStr)] string oldpassword,
[MarshalAs(UnmanagedType.LPWStr)] string newpassword);
I have a set of test accounts that are going to be created but the accounts will be setup to require password change on the first login. I want to write a program in C# to go through the test accounts and change the passwords.
You can use the UserPrincipal class' SetPassword method, provided you have enough privileges, once you've found the correct UserPrincipal object. Use FindByIdentity to look up the principal object in question.
using (var context = new PrincipalContext( ContextType.Domain ))
{
using (var user = UserPrincipal.FindByIdentity( context, IdentityType.SamAccountName, userName ))
{
user.SetPassword( "newpassword" );
// or
user.ChangePassword( "oldPassword", "newpassword" );
user.Save();
}
}
Here's a great Active Directory programming quick reference:
Howto: (Almost) Everything In Active Directory via C#
See the password reset code near the end.
public void ResetPassword(string userDn, string password)
{
DirectoryEntry uEntry = new DirectoryEntry(userDn);
uEntry.Invoke("SetPassword", new object[] { password });
uEntry.Properties["LockOutTime"].Value = 0; //unlock account
uEntry.Close();
}
Try this code. It works for me,
public void ChangeMyPassword(string domainName, string userName, string currentPassword, string newPassword)
{
try
{
string ldapPath = "LDAP://192.168.1.xx";
DirectoryEntry directionEntry = new DirectoryEntry(ldapPath, domainName + "\\" + userName, currentPassword);
if (directionEntry != null)
{
DirectorySearcher search = new DirectorySearcher(directionEntry);
search.Filter = "(SAMAccountName=" + userName + ")";
SearchResult result = search.FindOne();
if (result != null)
{
DirectoryEntry userEntry = result.GetDirectoryEntry();
if (userEntry != null)
{
userEntry.Invoke("ChangePassword", new object[] { currentPassword, newPassword });
userEntry.CommitChanges();
}
}
}
}
catch (Exception ex)
{
throw ex;
}
}
Here is the solution:
string newPassword = Membership.GeneratePassword(12, 4);
string quotePwd = String.Format(#"""{0}""", newPassword);
byte[] pwdBin = System.Text.Encoding.Unicode.GetBytes(quotePwd);
UserEntry.Properties["unicodePwd"].Value = pwdBin;
UserEntry.CommitChanges();
It is possible to set a new password to a domain account, by using .NET Framework 2.0.
See working code bellow:
string domainfqdn="mydomain.test.gov" //fqdn of the domain
string ldapPath =GetObjectDistinguishedName (objectClass.user,returnType.distinguishedName, args[0].ToString(),domainfqdn);
ldapPath="LDAP://" + domainfqdn + :389/"+ldapPath;
DirectoryEntry uEntry = new DirectoryEntry(ldapPath,null,null,AuthenticationTypes.Secure);
uEntry.CommitChanges();
Console.WriteLine(ldapPath);
string password="myS3cr3tPass"
uEntry.Invoke("SetPassword", new object[] { password });
uEntry.Properties["LockOutTime"].Value = 0; //unlock account
uEntry.CommitChanges();
uEntry.Close();
it is very importan to check the parameters at uEntry, the code will run under the current thread security context, unless the null values are specified
public void ResetPassword(string userName, string Password, string newPassword)
{
try
{
DirectoryEntry directoryEntry = new DirectoryEntry(Path, userName, Password);
if (directoryEntry != null)
{
DirectorySearcher searchEntry = new DirectorySearcher(directoryEntry);
searchEntry.Filter = "(samaccountname=" + userName + ")";
SearchResult result = searchEntry.FindOne();
if (result != null)
{
DirectoryEntry userEntry = result.GetDirectoryEntry();
if (userEntry != null)
{
userEntry.Invoke("SetPassword", new object[] { newPassword });
userEntry.Properties["lockouttime"].Value = 0;
}
}
}
}
catch (Exception ex)
{
Log.Error("Password Can't Change:" + ex.InnerException.Message);
}
}