Hi, we want to use squid with kerberos authentication and ldap authorization in the future. We use ntlm with windbind for a few years and it worked great, but now it´s time for kerberos. We have squid-3.0.STABLE9-1.el5 running CentOS 5.4. The rpm is from this website: http://www.osnets.de/wordpress/squid/squid-proxy-authentifizierung/ We created a keytab using ktpass on the DC with the following command: ktpass –princ http/proxy-kerberos.heidelberg.bw-online.de@xxxxxxxxxxxxxxxxxxxxxxx –mapuser DNT1\proxy-kerberos_kerb –crypto All –pass PASSWORD –ptype KRB5_NT_SRV_HST –out c:\http.keytab The keytab-file is generated without any errors and we copied it to the centos running squid. The krb5.file looks like described in many postings I´ve read: [logging] Default = FILE:/var/log/krb5libs.log kdc = FILE:/var/log/krb5kdc.log admin_server = FILE:/var/log/kadmind.log [libdefaults] deafult_realm = HEIDELBERG.BW-ONLINE.DE dns_lookup_realm = true dns_lookup_kdc = 24h ticket_lifetime = 24h forwardable = yes [realms] HEIDELBERG.BW-ONLINE.DE = { kdc = dc3.heidelberg.bw-online.de:88 admin_server = dc3.heidelberg.bw-online.de:749 default_domain = heidelberg.bw-online.de } [domain_realm] .heidelberg.bw-online.de = HEIDELBERG.BW-ONLINE.DE heidelberg.bw-online.de = HEIDELBERG.BW-ONLINE.DE I can kinit USER, he asks fort he password and I get a ticket. I can also do a kinit –V –k –t /etc/http.keytab HTTP/proxy-kerberos.heidelberg.bw-online.de and I get the message „Authenticated to Kerberos v5“. The problem ist, that sometimes I get authenticated in the proxy, the client (WinXP, IE 7) doens´t ask für credentials, but when I then reboot the machine with squid, the client asks for credentials and will not get authenticated. I can then see the following entry in /var/log/squid/cache.log: squid_kerb_auth: gss_acquire_cred() failed: Unspecified GSS faliure. Minor code may provide more information. No such file or directory I also get the following message in cache.log, even when the auth works:, so I think, this is not the great problem: squid_kerb_auth: parseNegTokenInit failed with rc=102 After undefined time, the authentication works again. I thought, it works again when I delete the client from the AD and joined again, but it was not reproduceable. Has anyone an idea ? Best regards Ralf Lutz
