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POc# Log In click event using authentication against Active Directory through LDAP
 

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  1. POc# Log In click event using authentication against Active Directory through LDAP
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    <p>I am quite new to c# and LDAP, I'm doing this project so that I could learn about them in a more hands on approach.</p> <p>What I'm trying to create is a Log in form that has a log in click event that would authenticate the username and password after the user enters them through the active directory using LDAP. </p> <p>I have read <a href="http://msdn.microsoft.com/en-us/magazine/cc135979.aspx" rel="nofollow noreferrer">Managing Directory Security Principals in the .NET Framework 3.5</a> to be able to understand this subject better and I have also gone through similar topics here this one dealing with the validation in itself (<a href="https://stackoverflow.com/questions/290548/validate-a-username-and-password-against-active-directory">c# - Validate a username and password against Active Directory?</a>) and this one authenticating a username (<a href="https://stackoverflow.com/questions/469588/c-sharp-against-active-directory-over-ldap">c# against Active Directory over LDAP</a>) </p> <p>From the first linked topic I had learned that the following code should do the trick in authenticating a username and password:</p> <pre><code> using (PrincipalContext pc = new PrincipalContext(ContextType.Domain, "LDAP://example.string.com/OU=Users, Dc=example, Dc= string, DC=com")) { bool isValid = pc.ValidateCredentials(User, Password); } </code></pre> <p>So my approach to incorporate this to a click event was as follows:</p> <pre><code>using (PrincipalContext pc = new PrincipalContext(ContextType.Domain, "LDAP://example.string.com/OU=Users, Dc=example, Dc= string, DC=com")) bool isValid = pc.ValidateCredentials(User, Password); if(isValid) { Main m = new Main(); this.Close(); m.Show(); } else { MessageBox.Show("Invalid Username and/or Password","Error!"); textBox1.Clear(); textBox2.Clear(); textBox1.Focus(); } </code></pre> <p>Which is giving me a bool error of Embedded Statement. I tried the other approach I had read from the second post which was to use this code which authenticates only Username: </p> <pre><code> PrincipalContext pc = new PrincipalContext(ContextType.Domain, "LDAP://example.com/OU=Computers,OU=Users,dc=example,dc=com"); UserPrincipal user = UserPrincipal.FindByIdentity(pc, "username"); bool userExists = (user != null); </code></pre> <p>But I found that I wont be able to authenticate a password using this method as <strong>UserPrincipal.FindByPassword</strong> does not exist.</p> <p>I have also tried it this way but again <strong>.Password</strong> does not exist:</p> <pre><code> PrincipalContext pc = new PrincipalContext(ContextType.Domain,"LDAP://...."); UserPrincipal qbeUser = new UserPrincipal(pc); qbeUser.EmployeeId = User; //.Password does not exist UserPrincipal qbePassword = new UserPrincipal(pc); qbePassword.Password = Password; // create your principal searcher passing in the QBE principal PrincipalSearcher srchUser = new PrincipalSearcher(qbeUser); PrincipalSearcher srchPass = new PrincipalSearcher(qbePassword); // try to find that user and password UserPrincipal founduser = srchUser.FindOne() as UserPrincipal; UserPrincipal foundpass = srchPass.FindOne() as UserPrincipal; if (founduser != null) { if (foundpass != null) { Main m = new Main(); this.Close(); m.Show(); } else { MessageBox.Show("Password Not Valid."); textBox2.Clear(); textBox2.Focus(); } } else { MessageBox.Show("Username Not Valid."); textBox1.Clear(); textBox1.Focus(); } </code></pre> <p>Can someone kindly please instruct me as how one should correctly approach this.</p> <p>Thank you in advance.</p>
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    1. USGooseman Bossman
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    1. COwhat do you mean by "Which is giving me a bool error of Embedded Statement" below your first solution? In general that approach should work, maybe your problem isn't the authentication in general.
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      1. USDirk Trilsbeek
    2. COYes, there was a minor syntax error in my first approach, that's causing the bool error. I've already corrected it and will test it now and see if it works. Thank you.
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