How To Install Modauthkerb For Windows

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Achim@beren [~]$ klist • Creating the HTTP service principal for beren.grolmsnet.de For every kerberized host you have to create a service principal on the KDC.When using Windows 2000 that means you have to • create a dummyaccount in Windows Domain GROLMSNET.DE. It is used like a machine account. In this example the name of dummyaccount is kerbdummy1.

• login to the DC ulmo and use the Windows commandline tool ktpass to map the dummyaccount kerbdummy1 to the serviceprincipal HTTP/beren.grolmsnet.de@GROLMSNET.DE. You need that serviceprincipal to kerberize host beren. Ensure you use the canonical hostname of beren.grolmsnet.de in ktpass command. That means • if beren.grolmsnet.de is a CNAME-record use the DNS-name the CNAME record points to. • if beren.grolmsnet.de is an A-record ensure the corresponding PTR record points to beren.grolmsnet.de, too. (In other words: reverse-DNS-lookup of beren.grolmsnet.de's IP address has to point to beren.grolmsnet.de Use ktpass options as describe in the table below: Windows 2008 R2 DC Windows 2003 SP1 DC Windows 2003 DC Windows 2000 DC encryption type AES256 (not supported by WinXP) RC4 DES (experts say DES is weak) DES (experts say DES is weak) ktpass command.

C: >ktpass -princ HTTP/beren.grolmsnet.de@GROLMSNET.DE -mapuser kerbdummy1 -crypto DES-CBC-MD5 -pass longlongpassword -out c: temp berenkeytab ktpass description KDC's kvno ticket behavior sends a ticket with a Key Version Number (KVNO). Ensure you have the correct kvno in your keytabfile, if the ticket has a kvno it must match!

Sends no ticket with Key Version Number (KVNO) ktpass keytab behavior kvno is properly exported to keytabfile kvno is not properly exported to keytabfile, kvno-value in keytab is 1 for each run of ktpass. No problem when running ktpass one time, problem when ktpass is run more then one time because every run of ktpass increases the kvno in KDC. Workaround is to use -kvno=x option of ktpass with x = actual kvno + 1 The ktpass command creates the pricipal HTTP/beren.grolmsnet.de@GROLMSNET.DE, maps it to AD account kerbdummy1 and exports it's key to the keytabfile c: temp berenkeytab. Copy that file to beren.grolmsnet.de, you will need it in the next step. Copy file c: temp berenkeytab from DC ulmoto the location where it sould reside on host beren - in our example /usr/local/apache/conf/http_beren.krb5keytab An alternate way to create the needed keytabfile is from Dan Perry.

This tool you can use on your Unix box to create a keytab. With it there is no need to use ktpass nor copying keytabs around.• check if the KDC sends correct tickets Check if the KDC sends correct tickets (kvno, enctype) by getting a serviceticket and using klist: MIT Kerberos Heimdal. Achim@beren [~]$ ktutil -k http_beren.krb5keytab list It's important to check in detail 1. Kvno ticket's kvno must match kvno in keytab 2. Principal name principal name in ticket must match the principal name in keytab 3.

Encryption type If you have run the ktpass correctly the enctype in ticket and keytab is - for example - DES-CBC-MD5. If your ticket's enctype differs from keytab's enctype (one is enctype RC4, the other DES, for example) mod_auth_kerb will not work! If possible prefer RC4 over DES because the experts say (I am no one) DES is weak. If you want to kerberize additional hosts you need to create one dummyaccount an run ktpass per kerberized host. • preparing the keytabfile • Copy file c: temp berenkeytab from DC ulmo to the location where it sould reside on host beren ( /usr/local/apache/conf/http_beren.krb5keytab in our example) • Make /usr/local/apache/conf/http_beren.krb5keytab readable ( chmod 400) for the user that owns the httpd process. • Test if the created keytabfile works on maschine beren using kinit with loading key from keytabfile. Achim@beren [~]$ kinit -k -t /usr/local/apache/conf/http_beren.krb5keytab HTTP/beren.grolmsnet.de to test your keytab, the HTTP entry in the Kerberos DB, and your Kerberos configuration on the web server.