diff --git a/api/src/main/scala/za/co/absa/loginsvc/rest/provider/kerberos/ActiveDirectoryLdapAuthoritiesPopulator.scala b/api/src/main/scala/za/co/absa/loginsvc/rest/provider/kerberos/ActiveDirectoryLdapAuthoritiesPopulator.scala
new file mode 100644
index 0000000..8fb3480
--- /dev/null
+++ b/api/src/main/scala/za/co/absa/loginsvc/rest/provider/kerberos/ActiveDirectoryLdapAuthoritiesPopulator.scala
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2023 ABSA Group Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package za.co.absa.loginsvc.rest.provider.kerberos
+
+import org.springframework.ldap.core.DirContextOperations
+import org.springframework.security.core.GrantedAuthority
+import org.springframework.security.core.authority.{AuthorityUtils, SimpleGrantedAuthority}
+import org.springframework.security.ldap.userdetails.LdapAuthoritiesPopulator
+
+import java.util
+import javax.naming.ldap.LdapName
+
+class ActiveDirectoryLdapAuthoritiesPopulator extends LdapAuthoritiesPopulator  {
+
+  import scala.collection.JavaConverters._
+
+  override def getGrantedAuthorities(userData: DirContextOperations, username: String): util.Collection[_ <: GrantedAuthority] = {
+    val groups = userData.getStringAttributes("memberOf")
+
+    if (groups == null) {
+      AuthorityUtils.NO_AUTHORITIES
+    }
+    else {
+      groups.map({group =>
+        val ldapName = new LdapName(group)
+        val role = ldapName.getRdn(ldapName.size() - 1).getValue.toString
+        new SimpleGrantedAuthority(role)
+      }).toList.asJava
+    }
+  }
+}
diff --git a/api/src/main/scala/za/co/absa/loginsvc/rest/provider/kerberos/KerberosSPNEGOAuthenticationProvider.scala b/api/src/main/scala/za/co/absa/loginsvc/rest/provider/kerberos/KerberosSPNEGOAuthenticationProvider.scala
index e646182..f452838 100644
--- a/api/src/main/scala/za/co/absa/loginsvc/rest/provider/kerberos/KerberosSPNEGOAuthenticationProvider.scala
+++ b/api/src/main/scala/za/co/absa/loginsvc/rest/provider/kerberos/KerberosSPNEGOAuthenticationProvider.scala
@@ -23,13 +23,18 @@ import org.springframework.security.core.authority.AuthorityUtils
 import org.springframework.security.core.userdetails.{User, UserDetails, UserDetailsService}
 import org.springframework.security.kerberos.authentication.{KerberosAuthenticationProvider, KerberosServiceAuthenticationProvider}
 import org.springframework.security.kerberos.authentication.sun.{SunJaasKerberosClient, SunJaasKerberosTicketValidator}
+import org.springframework.security.kerberos.client.config.SunJaasKrb5LoginConfig
+import org.springframework.security.kerberos.client.ldap.KerberosLdapContextSource
 import org.springframework.security.kerberos.web.authentication.SpnegoAuthenticationProcessingFilter
+import org.springframework.security.ldap.search.FilterBasedLdapUserSearch
+import org.springframework.security.ldap.userdetails.{LdapUserDetailsMapper, LdapUserDetailsService}
 import za.co.absa.loginsvc.rest.config.auth.ActiveDirectoryLDAPConfig
 
 class KerberosSPNEGOAuthenticationProvider(activeDirectoryLDAPConfig: ActiveDirectoryLDAPConfig) {
 
   //TODO: Split into Multiple files for neater implementation
-  private val kerberos = activeDirectoryLDAPConfig.enableKerberos.get
+  private val ldapConfig = activeDirectoryLDAPConfig
+  private val kerberos = ldapConfig.enableKerberos.get
   private val kerberosDebug = kerberos.debug.getOrElse(false)
   private val logger = LoggerFactory.getLogger(classOf[KerberosSPNEGOAuthenticationProvider])
   logger.debug(s"KerberosSPNEGOAuthenticationProvider init")
@@ -39,7 +44,7 @@ class KerberosSPNEGOAuthenticationProvider(activeDirectoryLDAPConfig: ActiveDire
 
   if (kerberos.krbFileLocation.nonEmpty) {
     logger.info(s"Using KRB5 CONF from ${kerberos.krbFileLocation}")
-    System.setProperty("java.security.krb5.conf", kerberos.krbFileLocation)
+    System.setProperty("java.security.krb5.ini", kerberos.krbFileLocation)
   }
 
   def kerberosAuthenticationProvider(): KerberosAuthenticationProvider =
@@ -77,6 +82,31 @@ class KerberosSPNEGOAuthenticationProvider(activeDirectoryLDAPConfig: ActiveDire
       ticketValidator
     }
 
+  private def loginConfig(): SunJaasKrb5LoginConfig = {
+    val loginConfig = new SunJaasKrb5LoginConfig()
+    loginConfig.setServicePrincipal(kerberos.spn)
+    loginConfig.setKeyTabLocation(new FileSystemResource(kerberos.keytabFileLocation))
+    loginConfig.setDebug(kerberosDebug)
+    loginConfig.setIsInitiator(true)
+    loginConfig.setUseTicketCache(false)
+    loginConfig.afterPropertiesSet()
+    loginConfig
+  }
+
+  private def kerberosLdapContextSource(): KerberosLdapContextSource = {
+    val contextSource = new KerberosLdapContextSource(ldapConfig.url)
+    contextSource.setLoginConfig(loginConfig())
+    contextSource.afterPropertiesSet()
+    contextSource
+  }
+
+  private def ldapUserDetailsService() = {
+    val userSearch = new FilterBasedLdapUserSearch(activeDirectoryLDAPConfig.domain, activeDirectoryLDAPConfig.searchFilter, kerberosLdapContextSource())
+    val service = new LdapUserDetailsService(userSearch, new ActiveDirectoryLdapAuthoritiesPopulator())
+    service.setUserDetailsMapper(new LdapUserDetailsMapper())
+    service
+  }
+
   private def dummyUserDetailsService = new DummyUserDetailsService
 }