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Ldap Secure Connection

Ldap Authentication should be Secure

What does this mean ?

Many systems are integrated via the Lightweight Directory Access Protocol (LDAP) because it allows systems to use a central directory of user and computer details which, in turn, allows systems to be consistent and user-aware and it allows users to access multiple services using the same set of credentials. An LDAP client authenticates to an LDAP server with a "bind request" which provides, among other, a simple authentication method.

What can happen ?

Anonymous binds and unauthenticated binds allow access to information in the LDAP directory without providing a password, their use is therefore strongly discouraged.

Recommendation

Simple authentication in LDAP can be used with three different mechanisms: - Anonymous Authentication Mechanism by performing a bind request with a username and password value of zero length. - Unauthenticated Authentication Mechanism by performing a bind request with a password value of zero length. - Name/Password Authentication Mechanism by performing a bind request with a password value of non-zero length.

Sample Code

Vulnerable :

DirectoryEntry myDirectoryEntry = new DirectoryEntry(adPath);
myDirectoryEntry.AuthenticationType = AuthenticationTypes.None; // Noncompliant

DirectoryEntry myDirectoryEntry = new DirectoryEntry(adPath, "u", "p", AuthenticationTypes.None); // Noncompliant

Non Vulnerable :

DirectoryEntry myDirectoryEntry = new DirectoryEntry(myADSPath); // Compliant; default DirectoryEntry.AuthenticationType property value is "Secure" since .NET Framework 2.0

DirectoryEntry myDirectoryEntry = new DirectoryEntry(myADSPath, "u", "p", AuthenticationTypes.Secure);

Vulnerable :

// Set up the environment for creating the initial context
Hashtable<String, Object> env = new Hashtable<String, Object>();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
env.put(Context.PROVIDER_URL, "ldap://localhost:389/o=JNDITutorial");

// Use anonymous authentication
env.put(Context.SECURITY_AUTHENTICATION, "none"); // Noncompliant

// Create the initial context
DirContext ctx = new InitialDirContext(env);

Non Vulnerable :

// Set up the environment for creating the initial context
Hashtable<String, Object> env = new Hashtable<String, Object>();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
env.put(Context.PROVIDER_URL, "ldap://localhost:389/o=JNDITutorial");

// Use simple authentication
env.put(Context.SECURITY_AUTHENTICATION, "simple");
env.put(Context.SECURITY_PRINCIPAL, "cn=S. User, ou=NewHires, o=JNDITutorial");
env.put(Context.SECURITY_CREDENTIALS, getLDAPPassword());

// Create the initial context
DirContext ctx = new InitialDirContext(env);

Vulnerable :

$ldapconn = ldap_connect("ldap.example.com");

if ($ldapconn) {
    $ldapbind = ldap_bind($ldapconn); // Noncompliant; anonymous authentication, no user/password provided
}

Non Vulnerable :

$ldaprdn  = 'uname';
$ldappass = 'password';

$ldapconn = ldap_connect("ldap.example.com");

if ($ldapconn) {
    $ldapbind = ldap_bind($ldapconn, $ldaprdn, $ldappass); // Compliant
}

References