Solaris problem after installing MIT 1.6.3

Douglas E. Engert deengert at
Wed Sep 10 15:14:19 EDT 2008

Chavez, James R. wrote:
> Doug, Thanks for the reply.
> I am actually using kerberos for authenticating logins through ssh. 
> Because I had no DNS entry for this Solaris box I was getting the
> following debug output from pam_krb5.
> Aug 26 10:24:21 sshd[1147]: [ID 537602 auth.error]
> PAM-KRB5 (auth): krb5_verify_init_creds failed: 
> Hostname cannot be canonicalized.

This sounds like the sshd can not determine its FQDN. A host should
be able to determine its name without DNS.
This could be a /etc/hosts issue. The hostname should be fully qualified
and listed in /etc/hosts before any short name. Also check `hostname`
to make sure it is fully qualified.

> This is indicative of DNS issues according to the Solaris Kerberos
> Commom errors guide.
> The The Windows team controls DNS and I am not on the Windows team.

The other approach is to use a valid hostname that they will add to DNS.
DNS is not Windows centric, and they should be able to add other names too.

Are you using Windows AD for the KDC? (We do.)
If not does your realm name match any AD domain names?
If yes, then you will have issues down the road. Best to pick a realm
name that does not conflict with a domain name.

> A
> work around for me was to use Samba's net utility However Solaris 10's
> version was not built with the proper flag to allow this. So I needed to
> upgrade Samba to accomplish this. The Samba configure script was bombing
> looking for krb5 libs, so I installed MIT and pointed it there.

So you are trying to use Samba to get around the DNS issue?
I don't think you need samba at all.

Are you trying to use Samba's net join? i.e. use AD as the KDC?
There are other ways to do this, if you don't need other Samba features.

> Since I upgraded Samba and added the DNS entry I can successfully login
> using kerberos creds with pam_krb5, however now the debug output is no
> longer visible. Could be that everything is working flawlwessly but the
> debug flag should still populate the messages log with pam_krb5 entries
> regardless of success or failure I would think. At least with Linux this
> is true.

I should point out that the Solaris sshd calls pam with different Service
Names depending on how the authentication is being done.
(login is not one of them.) See the man sshd:

>    ____________________________________________________________
>     |       SSHv2 Userauth        |       PAM Service Name      |
>     |_____________________________|_____________________________|
>     | none                        | sshd-none                   |
>     |_____________________________|_____________________________|
>     | password                    | sshd-password               |
>     |_____________________________|_____________________________|
>     | keyboard-interactive        | sshd-kbdint                 |
>     |_____________________________|_____________________________|
>     | pubkey                      | sshd-pubkey                 |
>     |_____________________________|_____________________________|
>     | hostbased                   | sshd-hostbased              |
>     |_____________________________|_____________________________|
>     | gssapi-with-mic             | sshd-gssapi                 |
>     |_____________________________|_____________________________|
>     | gssapi-keyex                | sshd-gssapi                 |
>     |_____________________________|_____________________________|

So this may be a pam.conf issue. When sshd-gssapi is called,
pam_krb5 is not used at all! Only the account and session are
called to do other things.

pam_krb5 is used only for passwords and thus only for
password or keyboard-interactive.

> To answer your questions.
> When you say pam_krb5 fails, is it failing for the normal login without
> any samba involved, or only when a samba program is calling pam which
> calls pam_krb5?
> --This is during a normal login with no Samba involved. I am looking for
> verbose output for success or failure.
> Is this the Solaris provided pam_krb5, or did you build an open source
> version?
> --This is the Solaris version of pam_krb5.
> Did you replace any of the /usr/lib/krb5 libs?
> --The /usr/lib/krb5 libs should be intact, I installed the MIT stuff
> into /usr/local, the default.
> ldd /usr/lib/security/
> =>     /usr/lib/krb5/
> =>        /usr/lib/gss/
> =>   /lib/
> =>   /lib/
> =>     /lib/
> =>   /usr/lib/
> =>        /lib/
> =>        /lib/
> =>        /usr/lib/
> =>   /lib/
> =>    /lib/
> =>    /lib/
> =>   /lib/
> =>    /usr/lib/
> =>  /lib/
> =>         /lib/
> =>   /lib/
> =>     /lib/
>         /platform/SUNW,Ultra-60/lib/
>         /platform/SUNW,Ultra-60/lib/
> I ran a truss of klist and kinit and everything seems to be normal. I
> would not know how to directly invoke a truss of pam_krb5 however. 
> Well at least kerberos is authenticating..Would be nice to see some
> debug though. Perhaps I can reinstall or freshen the pam_krb5 on my
> Solaris box? I will have to look into that.
> Thank you
> James
> -----Original Message-----
> From: Douglas E. Engert [mailto:deengert at] 
> Sent: Wednesday, September 10, 2008 7:28 AM
> To: Chavez, James R.
> Cc: kerberos at
> Subject: Re: Solaris problem after installing MIT 1.6.3
> Chavez, James R. wrote:
>> Hello,
>> Please point me to the correct list if this is wrong.
>> I was having an issue compiling samba3.2.3 on my Solaris 10 box. It 
>> would not compile with the native Solaris 10 Kerberos libraries. I 
>> installed MIT Kerberos 1.6.3 from source and was able to successfully 
>> install Samba by pointing it to the MIT libraries.
>> Prior to installing MIT 1.6.3 Kerberos, I was getting debug 
>> information from Since the installation however I get 
>> nothing. I get nothing in the messages log concerning the failed 
>> kerberos login attempts nor for successful. Is there something I can 
>> do to get pam_krb5 to log messages again? Something perhaps I forgot 
>> to do after installing the MIT version. As I understand it, Solaris 10
>> Kerberos is based on MIT Kerberos. The way I was getting debug info 
>> from previously was by appending debug to the lines in 
>> pam.conf. Does installing the MIT version of Kerberos change the way 
>> pam_krb5 logs debug output? Perhaps in the app_defaults section in the
> krb5.conf file?
> When you say pam_krb5 fails, is it failing for the normal login without
> any samba involved, or only when a samba program is calling pam which
> calls pam_krb5?
> Is this the Solaris provided pam_krb5, or did you build an open source
> version?
> Did you replace any of the /usr/lib/krb5 libs?
> It could be a problem of the samba program loading the MIT libs, and the
> pam_krb5 loading /usr/lib/krb5/ and
> /usr/lib/gss/ There have duplicate routine names. The
> pam_krb5 may be calling the MIT versions of these routines and failing.
> If you can run the program under truss you can see what libs are loaded,
> and maybe where the pam_krb5 is failing.
>> Thanks
>> James
>> pam.conf
>> -----------------------
>> #login
>> login     auth requisite
>> login     auth required 
>> login     auth sufficient debug
>> login     auth required 
>> login     account optional debug
>> login     session required
>> login     session optional debug
>> login     password optional debug
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  Douglas E. Engert  <DEEngert at>
  Argonne National Laboratory
  9700 South Cass Avenue
  Argonne, Illinois  60439
  (630) 252-5444

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