[Freeipa-devel] [freeipa PR#629][opened] adtrust: make sure that runtime hostname result is consistent with the configuration

[abbra]

   URL: https://github.com/freeipa/freeipa/pull/629
Author: abbra
 Title: #629: adtrust: make sure that runtime hostname result is consistent with the configuration
Action: opened

PR body:
"""

FreeIPA's `ipasam` module to Samba uses gethostname() call to identify
own server's host name. This value is then used in multiple places,
including construction of cifs/host.name principal. `ipasam` module
always uses GSSAPI authentication when talking to LDAP, so Kerberos
keys must be available in the /etc/samba/samba.keytab. However, if
the principal was created using non-FQDN name but system reports
FQDN name, `ipasam` will fail to acquire Kerberos credentials.
Same with FQDN principal and non-FQDN hostname.

Also host name and principal name must have the same case.

Report an error when configuring ADTrust instance with inconsistent
runtime hostname and configuration. This prevents errors like this:

    [20/21]: starting CIFS services
    ipa         : CRITICAL CIFS services failed to start

    where samba logs have this:

    [2017/03/20 06:34:27.385307,  0] ipa_sam.c:4193(bind_callback_cleanup)
      kerberos error: code=-1765328203, message=Keytab contains no suitable keys for cifs/ipatrust at EXAMPLE.COM
    [2017/03/20 06:34:27.385476,  1] ../source3/lib/smbldap.c:1206(get_cached_ldap_connect)
      Connection to LDAP server failed for the 16 try!

Fixes https://pagure.io/freeipa/issue/6786
"""

To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/629/head:pr629
git checkout pr629
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