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Kerberos Server Configuration

These notes are for MIT Kerberos 1.3 or higher.

  • /etc/krb5.conf
  • The /etc/krb5.conf configuration file should include rc4-hmac support under the [libdefaults] section. Windows XP uses rc4-hmac. However, do not include rc4-hmac in the default* encryption types, as older Unix clients may not support rc4-hmac.

    [libdefaults]
    default_realm = EXAMPLE.ORG
    default_etypes = des3-hmac-sha1 des-cbc-crc
    default_tkt_enctypes = des3-hmac-sha1 des-cbc-crc
    default_tgs_enctypes = des3-hmac-sha1 des-cbc-crc
    permitted_enctypes = des3-hmac-sha1 des-cbc-crc rc4-hmac
    dns_lookup_realm = false
    dns_lookup_kdc = true

  • kdc.conf
  • The kdc.conf configuration file on the Kerberos servers must support rc4-hmac as an encryption type.

    [realms]
    EXAMPLE.ORG = {
    database_name = /var/kerberos/krb5kdc/principal
    key_stash_file = /var/kerberos/krb5kdc/.k5.EXAMPLE.ORG
    supported_enctypes = des3-hmac-sha1:normal des-cbc-crc:normal ?
    rc4-hmac:normal
    }

Windows Client Setup

  • Kerberos Configuration
  • Use the ksetup.exe command to add the site Kerberos servers.

    $ ksetup.exe /addkdc EXAMPLE.ORG kerberos-1.example.org
    $ ksetup.exe /addkdc EXAMPLE.ORG kerberos-2.example.org
    $ ksetup.exe /addkdc EXAMPLE.ORG kerberos.example.org
    $ ksetup.exe /addkpasswd EXAMPLE.ORG kerberos.example.org
    $ ksetup.exe /setrealm EXAMPLE.ORG

  • Host principals
  • Create host principals on each Windows client, then use the same password to create an equivalent principal in the MIT Kerberos database. If using an installation system such as Unattended, use a script to generate the random password and setup the host principal.

    #!/usr/bin/perl

    my $domain = 'example.org';

    my $password = '';
    my @chars = grep { /[[:print:]]/ and /\S/ } map { chr } 1..128;
    $password .= $chars[rand @chars] for 1..(int (rand 7)) + 8;

    system qw{ksetup.exe /setcomputerpassword}, $password;

    print "Principal: host/", lc( $ENV{COMPUTERNAME} ), ".$domain\n";
    print "Password: $password\n";

    Then, use kdamin to add an equivalent principal to the Kerberos database, using the same password as above. Use the -e rc4-hmac:normal encryption option if adding a principal for a Windows XP system.

    kadmin: ank -e rc4-hmac:normal host/client.example.org

  • User Mapping
  • User mapping translates local accounts to the Kerberos domain. See module:users for user account management under CFEngine.

    $ ksetup.exe /mapuser * *

Samba

Windows clients can authenticate to Samba using Kerberos. Use Samba version 3.0.14a or higher on the server, and enable Kerberos support in the smb.conf configuration file.

[global]
use kerberos keytab = yes
realm = EXAMPLE.ORG
security = ads

Multiple host and cifs principals must be created for each Samba server, as principals are case sensitive, and Windows systems may randomly start using Server.example.org or SERVER.EXAMPLE.ORG when connecting. Extract these principals to the /etc/krb5.keytab file on each Samba server.

kadmin: ank -randkey host/server.example.org
kadmin: ank -randkey host/Server.example.org
kadmin: ank -randkey host/SERVER.EXAMPLE.ORG
kadmin: ank -randkey cifs/server.example.org
kadmin: ank -randkey cifs/Server.example.org
kadmin: ank -randkey cifs/SERVER.EXAMPLE.ORG
kadmin: ktadd -k /etc/krb5.keytab host/server.example.org
kadmin: ktadd -k /etc/krb5.keytab host/Server.example.org
kadmin: ktadd -k /etc/krb5.keytab host/SERVER.EXAMPLE.ORG
kadmin: ktadd -k /etc/krb5.keytab cifs/server.example.org
kadmin: ktadd -k /etc/krb5.keytab cifs/Server.example.org
kadmin: ktadd -k /etc/krb5.keytab cifs/SERVER.EXAMPLE.ORG

posted on 2013-05-18 15:04 ivaneeo 阅读(268) 评论(0)  编辑  收藏 所属分类: debian-企鹅中最像牛GNU牛力

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