[Freeipa-users] Woes adding a samba server to the ipa domain

Loris Santamaria loris at lgs.com.ve
Wed Oct 29 19:54:19 UTC 2014

El jue, 23-10-2014 a las 12:32 +0200, Sumit Bose escribió:
> On Tue, Oct 21, 2014 at 07:49:11AM -0430, Loris Santamaria wrote:
> > El lun, 20-10-2014 a las 21:19 -0400, Dmitri Pal escribió:
> > > On 10/20/2014 09:15 AM, Loris Santamaria wrote:
> > 
> > [...]
> > 
> > > > 
> > > > Trying to join the server to the domain (net rpc join -U domainadmin -S
> > > > ipaserver) fails, and it causes a samba crash on the ipa server.
> > > > Investigating the cause of the crash I found that pdbedit crashes as
> > > > well (backtrace attached). I couldn't get a meaningful backtrace from
> > > > the samba crash however I attached it as well.
> > > > 
> > > > Seems to me that the samba ipasam backend on ipa doesn't like something
> > > > in the host or the "domain computers" group object in ldap, but I cannot
> > > > see what could be the problem. Perhaps someone more familiar with the
> > > > ipasam code can spot it quickly.
> > 
> > > Do I get it right that you really looking for
> > > https://fedorahosted.org/sssd/ticket/1588 that was just released
> > > upstream?
> > > It would be cool if you can try using SSSD 1.12.1 under Samba FS in
> > > the use case you have and provide feedback on how it works for you.
> > > 
> > > AFAIU you install Samba FS and then use ipa-client to configure SSSD
> > > under it and it should work.
> > > If not we probably should document it (but I do not see any special
> > > design page which leads me to the above expectation).
> > 
> > Ok, I'll happily try sssd 1.12.1.
> > 
> > Just a question, in smb.conf one should use "security = domain" or
> > "security = ads"?
> 'ads' because we want to use Kerberos. But there some other
> configuration options which needs attention, e.g. you have to create a
> keytab for the cifs service and make it available to samba. I'll try to
> set up an small howto page listing the needed steps and come back to you
> early next week.

It Works :D, and here is what I did:

Test environment: One realm domain with two Centos 7 / ipa 3.3 masters,
one trusted AD forest (windows 2008R2 controllers), one Centos 7 file

Step 1) On the file server enable mkosek's COPR ipa repo:

2) Install required packages packages:
yum -y install ipa-client sssd-libwbclient samba samba client

3) join file server to the ipa realm:
ipa-client-install --mkhomedir

Please note that this step fails, shortly after creating the keytab and
configuring sssd, probably caused by the version mismatch between ipa
server (3.3) and client (4.1). I will report the failure shortly.
Because of the failure I had to complete part of the join procedure
authconfig --enablesssdauth --enablemkhomedir --update (on the client)
ipa dnsrecord-add my.realm sambatest --a-rec=x.y.w.z (on ipa server)

4) On the ipa server create the cifs principal for samba:
ipa service-add cifs/sambatest.my.realm

5) Install keytab on the samba host:
ipa-getkeytab -s ipaserver.my.realm -p cifs/sambatest.my.realm
-k /etc/samba/samba.keytab

6) Edit /etc/samba/smb.conf on the samba file server:
	workgroup = MY
	realm = MY.REALM
	dedicated keytab file = FILE:/etc/samba/samba.keytab
	kerberos method = dedicated keytab
	log file = /var/log/samba/log.%m
	security = ads

	browsable = no
	writable = yes

	path = /home/shared
	writable = yes
	write list = @admins

7) To enable samba /home sharing one should turn on a selinux boolean:
setsebool -P samba_enable_home_dirs on

8) restart samba


On another linux member of the IPA domain it is possible to connect to
the samba shares using smbclient -k :
kinit user at MY.REALM
smbclient -k -L sambatest.my.realm
smbclient -k //sambatest.my.realm/shared

On a windows machine, member of the AD domain it is possible to connect
to the samba shares typing in the windows explorer location bar:
Also, if the ad user is an (indirect) member of the IPA admins group,
thanks to the trust relationship, with the above smb.conf he may have
write access to the \shared folder.

Thanks to the ipa and sssd teams for this great enablement!
Loris Santamaria   linux user #70506   xmpp:loris at lgs.com.ve
Links Global Services, C.A.            http://www.lgs.com.ve
Tel: 0286 952.06.87  Cel: 0414 095.00.10  sip:103 at lgs.com.ve
"If I'd asked my customers what they wanted, they'd have said
a faster horse" - Henry Ford
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