java - GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)

Question

I am very much new to the MOngoDB + Java Configuration. I am trying to achive the connection from remote mongodb server from Java application. I want to use GSSAPI mechanism for connection with mongotemplate. Below code has been executing successfully. Below code is from my configuration file.

List<ServerAddress> serverAddresses = new ArrayList<ServerAddress>();
    ServerAddress address = new ServerAddress(host, port);
    serverAddresses.add(address);
    List<MongoCredential> credentials = new ArrayList<MongoCredential>();

    MongoCredential credential = MongoCredential.createGSSAPICredential(userName);

    credential.withMechanismProperty("SERVICE_NAME", gssapiServiceName);
    credential.withMechanismProperty("CANONICALIZE_HOST_NAME", true);
    credentials.add(credential);

    return new MongoClient(serverAddresses, credentials);

But when I am trying execute below code I am getting exception

DB db = mongoTemplate.getDb();
Set<String> dbCollections1 = db.getCollectionNames();

Exception:

GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt) at sun.security.jgss.krb5.Krb5InitCredential.getInstance(Krb5InitCredential.java:147) at sun.security.jgss.krb5.Krb5MechFactory.getCredentialElement(Krb5MechFactory.java:122) at sun.security.jgss.GSSManagerImpl.getCredentialElement(GSSManagerImpl.java:193) at sun.security.jgss.GSSCredentialImpl.add(GSSCredentialImpl.java:427) at sun.security.jgss.GSSCredentialImpl.(GSSCredentialImpl.java:62) at sun.security.jgss.GSSManagerImpl.createCredential(GSSManagerImpl.java:154) at com.mongodb.DBPort$GSSAPIAuthenticator.getGSSCredential(DBPort.java:622) at com.mongodb.DBPort$GSSAPIAuthenticator.createSaslClient(DBPort.java:593) at com.mongodb.DBPort$SaslAuthenticator.authenticate(DBPort.java:895) at com.mongodb.DBPort.authenticate(DBPort.java:432) at com.mongodb.DBPort.checkAuth(DBPort.java:443) at com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:289) at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:269) at com.mongodb.DBCollectionImpl.find(DBCollectionImpl.java:84) at com.mongodb.DB.command(DB.java:320) at com.mongodb.DB.command(DB.java:299) at com.mongodb.DB.command(DB.java:388) at com.mongodb.DBApiLayer.getCollectionNames(DBApiLayer.java:152)

Answer 1

Million thanks to all who have responded and take a look to my question.

After adding some System Properties and a new conf file, Finally I am able to get connected with MongoDB server. Herewith the updated code -

try {
        System.setProperty("java.security.krb5.conf","C:/mongodb/UnixKeytab/krb5.conf");
        System.setProperty("java.security.krb5.realm","EXAMPLE.COM");
        System.setProperty("java.security.krb5.kdc","example.com");
        System.setProperty("javax.security.auth.useSubjectCredsOnly","false");
        System.setProperty("java.security.auth.login.config","C:/mongodb/UnixKeytab/gss-jaas.conf");


        List<ServerAddress> serverAddresses = new ArrayList<ServerAddress>();
        ServerAddress address = new ServerAddress(host, port);
        serverAddresses.add(address);
        List<MongoCredential> credentials = new ArrayList<MongoCredential>();
        MongoCredential credential = MongoCredential.createGSSAPICredential(username);
        credentials.add(credential);
        MongoClient mongoClient1 = new MongoClient(serverAddresses, credentials);
        DB db = mongoClient1.getDB(database);

    } catch (UnknownHostException e) {
        e.printStackTrace();
    }

My krb5.conf file look like below -

[libdefaults]
     default_realm = EXAMPLE.COM
     default_tkt_enctypes = des-cbc-md5 rc4-hmac
     default_tgs_enctypes = des-cbc-md5 rc4-hmac
     default_keytab_name = <keytab file path>
[realms]
EXAMPLE.COM = {
    kdc = example.com
    master_kdc = example.com
    default_domain = EXAMPLE.COM
}
INTRANET = {
    kdc = example.com
    master_kdc = example.com
    default_domain = example.com
}

My gss-jaas.conf look like below -

com.sun.security.jgss.initiate {
com.sun.security.auth.module.Krb5LoginModule required
useKeyTab=true
useTicketCache=false
principal="my-account@MY_REALM"
doNotPrompt=true
keyTab="path-to-my-keytab-file"
debug=true;};

Code I have posted is working for me. Hope this will work for others.