ActiveDirectoryHowto
Active Directory from Microsoft is a directory service, that uses some open protocols, like Kerberos, ldap and SSL.
There are some ways to use AD for authentication, you can use pam_krb5, LDAP or winbind. For Winbind see [ActiveDirectoryWinbindHowto].
Kerberos: pam_krb5
Configure AD:
For pam_krb5 you do not need to configure anything.
pam_krb5
# apt-get install krb5-user libpam-krb5
Packetinfo: krb5-user-1.3.4-4 MIT Kerberos5, libpam-krb5-1.0-8 MIT Kerberos5
set up /etc/krb5.conf, e.g.
[logging] default = FILE:/var/log/krb5lib.log [libdefaults] ticket_lifetime = 24000 default_realm = EXAMPLE.COM default_tkt_enctypes = des3-hmac-sha1 des-cbc-crc default_tgs_enctypes = des3-hmac-sha1 des-cbc-crc [realms] EXAMPLE.COM = { kdc = windc.example.com admin_server = windc.example.com default_domain = example.com } [domain_realm] .example.com = EXAMPLE.COM example.com = EXAMPLE.COM
Replace windc.example.com with the IP or FQDN of your Windows domain controller and EXAMPLE.COM with your kerberos realm, typically is this the domainname in uppercase.
Try if you can receive a kerberos ticket:
# kinit user Password for user@EXAMPLE.COM: ... # klist Ticket cache: FILE:/tmp/krb5cc_1003 Default principal: user@EXAMPLE.COM Valid starting Expires Service principal 11/26/04 11:23:53 11/26/04 21:23:53 krbtgt/EXAMPLE.COM@EXAMPLE.COM Kerberos 4 ticket cache: /tmp/tkt0 klist: You have no tickets cached
set up /etc/pam.d/common-auth, e.g.
auth sufficient pam_krb5.so ccache=/tmp/krb5cc_%u auth sufficient pam_unix.so likeauth nullok use_first_pass auth required pam_deny.so
set up /etc/pam.d/common-session, e.g.
session required pam_unix.so session required pam_mkhomedir.so skel=/etc/skel/ umask=0077
attachment:IconsPage/IconNote.png kpasswd for password changing does not work.
attachment:IconsPage/IconNote.png The user from AD have to exist in /etc/passwd on the ubuntu workstation, you can also use libnss-ldap to get the account info also from AD.
LDAP: libnss-ldap
Configure AD
It is necessary to extend the LDAP schema from AD with the UNIX attributes , install "UNIX Services for Windows" from Microsoft (I used version 3.5). SFU: http://www.microsoft.com/windows/sfu/
libnss-ldap
Install libnss-ldap and the Name Service Caching Deamon for a better performance.
# apt-get install libnss-ldap nscd
Packetinfo: libnss-ldap-211-4, nscd-2.3.2-ds1-13ubuntu2
set up /etc/nsswitch.conf for ldap, e.g.
passwd: compat ldap shadow: compat ldap group: compat ldap hosts: files dns networks: files dns services: db files protocols: db files rpc: db files ethers: db files netmasks: files netgroup: files bootparams: files automount: files aliases: files
set up /etc/libnss-ldap.conf, e.g.
# Replace windc.example.com with your Windows DC uri ldap://windc.example.com/ base dc=example,dc=com ldap_version 3 # Add a user to AD, that can read the container # with the users, that you want use. binddn cn=ldapreader,cn=Users,dc=example,dc=com bindpw cvfd123 scope sub timelimit 30 pam_filter objectclass=User pam_login_attribute sAMAccountName pam_lookup_policy yes # Modify ou=User,dc=e... to your container with your users. nss_base_passwd ou=User,dc=example,dc=com?sub nss_base_shadow ou=User,dc=example,dc=com?sub nss_base_group ou=User,dc=example,dc=com?sub # For MSSFU: nss_map_objectclass posixAccount User nss_map_objectclass shadowAccount User nss_map_attribute uid sAMAccountName nss_map_attribute uniqueMember member nss_map_attribute uidNumber msSFU30UidNumber nss_map_attribute gidNumber msSFU30GidNumber nss_map_attribute userPassword msSFU30Password nss_map_attribute homeDirectory msSFU30HomeDirectory nss_map_attribute loginShell msSFU30LoginShell nss_map_attribute gecos name nss_map_attribute cn sAMAccountName
attachment:IconsPage/IconNote.png With this config is the LDAP Traffic unencrypted and someone can sniff it. To make it secure use SSL
set up /etc/pam.d/common-auth
# # /etc/pam.d/common-auth - authentication settings common to all services # # This file is included from other service-specific PAM config files, # and should contain a list of the authentication modules that define # the central authentication scheme for use on the system # (e.g., /etc/shadow, LDAP, Kerberos, etc.). The default is to use the # traditional Unix authentication mechanisms. # auth sufficient pam_ldap.so auth required pam_unix.so nullok_secure use_first_pass
set up /etc/pam.d/common-account
# # /etc/pam.d/common-account - authorization settings common to all services # # This file is included from other service-specific PAM config files, # and should contain a list of the authorization modules that define # the central access policy for use on the system. The default is to # only deny service to users whose accounts are expired in /etc/shadow. # account sufficient pam_ldap.so account required pam_unix.so
other usseful config files:
- login.defs nscd.conf
From GuyVanSanden Tue Jun 7 13:34:50 +0100 2005 From: Guy Van Sanden Date: Tue, 07 Jun 2005 13:34:50 +0100 Subject: Sudo Message-ID: <20050607133450+0100@https://www.ubuntulinux.org>
I'm using pam_krb5 against a MIT server. gksu(do) does not work with this module (because it queries your password with username@DOMAIN). Is there a way arround this?