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From d6d1ce2f8b1c81903115b018973c61fc71235b7b Mon Sep 17 00:00:00 2001
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From: Sumit Bose <sbose@redhat.com>
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Date: Fri, 29 Nov 2019 18:10:03 +0100
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Subject: [PATCH] doc: extend user-principal section
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Related to https://bugzilla.redhat.com/show_bug.cgi?id=1643814
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---
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doc/manual/realm.xml | 21 +++++++++++++++++++--
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doc/manual/realmd.conf.xml | 15 ++++++++++-----
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2 files changed, 29 insertions(+), 7 deletions(-)
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diff --git a/doc/manual/realm.xml b/doc/manual/realm.xml
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index 7b73331..55a7640 100644
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--- a/doc/manual/realm.xml
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+++ b/doc/manual/realm.xml
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@@ -254,10 +254,27 @@ $ realm join --user=admin --computer-ou=OU=Special domain.example.com
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</varlistentry>
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<varlistentry>
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<term><option>--user-principal=<parameter>host/name@REALM</parameter></option></term>
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- <listitem><para>Set the userPrincipalName field of the
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+ <listitem><para>Set the
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+ <option>userPrincipalName</option> field of the
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computer account to this kerberos principal. If you omit
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the value for this option, then a principal will be set
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- in the form of <literal>host/shortname@REALM</literal></para></listitem>
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+ based on the defaults of the membership software.</para>
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+ <para>AD makes a distinction between user and service
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+ principals. Only with user principals you can request a
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+ Kerberos Ticket-Granting-Ticket (TGT), i.e. only user
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+ principals can be used with the <command>kinit</command>
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+ command. By default the user principal and the canonical
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+ principal name of an AD computer account is
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+ shortname$@AD.DOMAIN, where shortname is
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+ the NetBIOS name which is limited to 15 characters.</para>
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+ <para>If there are applications which are not aware of
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+ the AD default and are using a hard-coded default
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+ principal the <option>--user-principal</option> can be
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+ used to make AD aware of this principal. Please note
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+ that <option>userPrincipalName</option> is a single
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+ value LDAP attribute, i.e. only one alternative user
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+ principal besides the AD default user principal can be
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+ set.</para></listitem>
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</varlistentry>
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</variablelist>
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diff --git a/doc/manual/realmd.conf.xml b/doc/manual/realmd.conf.xml
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index f0b0879..a26a60c 100644
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--- a/doc/manual/realmd.conf.xml
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+++ b/doc/manual/realmd.conf.xml
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@@ -365,12 +365,17 @@ computer-name = SERVER01
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</listitem>
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</varlistentry>
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<varlistentry>
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- <term><option>user-prinicpal</option></term>
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+ <term><option>user-principal</option></term>
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<listitem>
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- <para>Set the <option>user-prinicpal</option> to yes
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- to create <option>userPrincipalName</option> attributes for the
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- computer account in the realm, in the form
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- host/computer@REALM</para>
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+ <para>Set the <option>user-principal</option> to yes
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+ to create <option>userPrincipalName</option> attribute for the
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+ computer accounts in the realm. The exact value depends on the
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+ defaults of the used membership software. To have full control
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+ over the value please use the
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+ <option>--user-principal</option> option of the
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+ <command>realm</command> command, see
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+ <citerefentry><refentrytitle>realm</refentrytitle>
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+ <manvolnum>8</manvolnum></citerefentry> for details.</para>
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<informalexample>
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<programlisting language="js">
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--
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2.21.0
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