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Samba 3.0 prealpha guide to Kerberos authentication
---------------------------------------------------
Andrew Tridgell
tridge@samba.org
This is a VERY ROUGH guide to setting up the current (October 2001)
pre-alpha version of Samba 3.0 with kerberos authentication against a
Windows2000 KDC. The procedures listed here are likely to change as
the code develops.
Pieces you need before you begin:
- a Windows 2000 server running at least service pack 2
- the latest CVS source code for Samba. See http://cvs.samba.org/ for how to
fetch this.
- the MIT kerberos development libraries (either install from the
above sources or use a package). Under debian you need "libkrb5-dev"
and "krb5-user". The heimdal libraries will not work.
- Cyrys SASL, including the gssapi mechanism.
- the OpenLDAP development libraries. These must be compiled
with Cyrus SASL enabled.
On RedHat this means you should have at least:
krb5-workstation (for kinit)
krb5-libs (for linking with)
krb5-devel (because you are compiling from source)
cyrus
cyrus-sasl
cyrus-sasl-devel
cyrus-sasl-gssapi
in addition to the standard development environment.
Note that these are not standard on a RedHat install, and you may need
to get them off CD2.
Also check that you have the latest copy of this HOWTO. It is
available from http://samba.org/ftp/tridge/kerberos/HOWTO
Step 1: Compile Samba
If your kerberos libraries are in a non-standard location then
remember to add the configure option --with-krb5=DIR. For example,
on RedHat you will need --with-krb5=/usr/kerberos
After you run configure make sure that include/config.h contains a
line like this:
#define HAVE_KRB5 1
If it doesn't then configure did not find your krb5 libraries. Look
in config.log to figure out why and fix it.
Then compile and install Samba as usual. You must use at least the
following 3 options in smb.conf:
realm = YOUR.KERBEROS.REALM
ads server = your.kerberos.server
security = ADS
encrypt passwords = yes
You do *not* need a smbpasswd file, although it won't do any harm
and if you have one then Samba will be able to fall back to normal
password security for older clients. I expect that the above
required options will change soon when we get better active
directory integration.
Step 2: Setup your /etc/krb5.conf
The minimal configuration for krb5.conf is:
[libdefaults]
default_realm = YOUR.KERBEROS.REALM
[realms]
YOUR.KERBEROS.REALM = {
kdc = your.kerberos.server
}
Test your config by doing a "kinit USERNAME" and making sure that
your password is accepted by the Win2000 KDC.
NOTE: The realm must be uppercase.
You also must ensure that you can do a reverse DNS lookup on the IP
address of your KDC. This usually either involves setting up a PTR
record in your DNS server or adding your KDC to /etc/hosts.
* If all you want is kerberos support in smbclient then you can skip
* straight to step 5 now. Step 3 is only needed if you want kerberos
* support in smbd.
Step 3: Create the computer account
Do a "kinit" as a user that has authority to change arbitrary
passwords on the KDC ("Administrator" is a good choice). Then as a
user that has write permission on the Samba private directory
(usually root) run:
net ads join
Possible errors:
- "bash: kinit: command not found":
- kinit is in the krb5-workstation RPM on RedHat systems, and is
in /usr/kerberos/bin, so it won't be in the path until
you log in again (or open a new terminal)
- "ADS support not compiled in"
- Samba must be reconfigured (remove config.cache) and
recompiled (make clean all install) after the kerberos libs
and headers are installed.
- "Unknown authentication method"
- the cyrus-sasl-gssapi package is not installed.
The RPM (assuming RedHat 7.2) is on CD2
- "ads_add_machine_acct: Invalid DN syntax"
- The 'realm' paramater has not been added to your smb.conf
Step 4: Test your server setup
On a Windows 2000 client try "net use * \\server\share". You should
be logged in with kerberos without needing to know a password. If
this fails then run "klist tickets". Did you get a ticket for the
server? Does it have an encoding type of DES-CBC-MD5 ?
Step 5: Testing with smbclient
On your Samba server try to login to a Win2000 server or your Samba
server using smbclient and kerberos. Use smbclient as usual, but
specify the -k option to choose kerberos authentication.
--------
NOTES:
- must change administrator password at least once after DC install,
to create the right encoding types
- w2k doesn't seem to create the _kerberos._udp and _ldap._tcp in
their defaults DNS setup. Maybe fixed in service packs?
|
