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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE reference PUBLIC "-//OASIS//DTD DocBook V4.4//EN"
"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
<reference>
<title>SSSD Manual pages</title>
<refentry>
    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="include/upstream.xml" />

    <refmeta>
        <refentrytitle>sssd-sudo</refentrytitle>
        <manvolnum>5</manvolnum>
        <refmiscinfo class="manual">File Formats and Conventions</refmiscinfo>
    </refmeta>

    <refnamediv id='name'>
        <refname>sssd-sudo</refname>
        <refpurpose>Configuring sudo with the SSSD back end</refpurpose>
    </refnamediv>

    <refsect1 id='description'>
        <title>DESCRIPTION</title>
        <para>
            This manual page describes how to configure
            <citerefentry>
                <refentrytitle>sudo</refentrytitle>
                <manvolnum>8</manvolnum>
            </citerefentry> to work with
            <citerefentry>
                <refentrytitle>sssd</refentrytitle>
                <manvolnum>8</manvolnum>
            </citerefentry> and how SSSD caches sudo rules.
        </para>
    </refsect1>

    <refsect1 id='sudo'>
        <title>Configuring sudo to cooperate with SSSD</title>
        <para>
            To enable SSSD as a source for sudo rules, add
            <emphasis>sss</emphasis> to the <emphasis>sudoers</emphasis> entry
            in
            <citerefentry>
                <refentrytitle>nsswitch.conf</refentrytitle>
                <manvolnum>5</manvolnum>
            </citerefentry>.
        </para>
        <para>
            For example, to configure sudo to first lookup rules in the standard
            <citerefentry>
                <refentrytitle>sudoers</refentrytitle>
                <manvolnum>5</manvolnum>
            </citerefentry> file (which should contain rules that apply to
            local users) and then in SSSD, the nsswitch.conf file should contain
            the following line:
        </para>
        <para>
<programlisting>
sudoers: files sss
</programlisting>
        </para>
        <para>
            More information about configuring the sudoers search order from the
            nsswitch.conf file as well as information about the LDAP schema that
            is used to store sudo rules in the directory can be found in
            <citerefentry>
                <refentrytitle>sudoers.ldap</refentrytitle>
                <manvolnum>5</manvolnum>
            </citerefentry>.
        </para>
    </refsect1>

    <refsect1 id='sssd'>
        <title>Configuring SSSD to fetch sudo rules</title>
        <para>
            The following example shows how to configure SSSD to download sudo
            rules from an LDAP server.
        </para>
        <para>
<programlisting>
[sssd]
config_file_version = 2
services = nss, pam, sudo
domains = EXAMPLE

[domain/EXAMPLE]
id_provider = ldap
sudo_provider = ldap
ldap_uri = ldap://example.com
ldap_sudo_search_base = ou=sudoers,dc=example,dc=com
</programlisting>
        </para>
        <para>
            The following example illustrates setting up SSSD to download
            sudo rules from an IPA server. It is necessary to use the LDAP
            provider and set appropriate connection parameters to authenticate
            correctly against the IPA server, because SSSD does not have native
            support of IPA provider for sudo yet.
        </para>
        <para>
<programlisting>
[sssd]
config_file_version = 2
services = nss, pam, sudo
domains = EXAMPLE

[domain/EXAMPLE]
id_provider = ipa
ipa_domain = example.com
ipa_server = ipa.example.com
ldap_tls_cacert = /etc/ipa/ca.crt

sudo_provider = ldap
ldap_uri = ldap://ipa.example.com
ldap_sudo_search_base = ou=sudoers,dc=example,dc=com
ldap_sasl_mech = GSSAPI
ldap_sasl_authid = host/hostname.example.com
ldap_sasl_realm = EXAMPLE.COM
krb5_server = ipa.example.com
</programlisting>
        </para>
    </refsect1>

    <refsect1 id='cache'>
        <title>The SUDO rule caching mechanism</title>
        <para>
            The biggest challenge, when developing sudo support in SSSD, was to
            ensure that running sudo with SSSD as the data source provides the
            same user experience and is as fast as sudo but keeps providing
            the most current set of rules as possible. To satisfy these
            requirements, SSSD uses three kinds of updates. They are referred to
            as full refresh, smart refresh and rules refresh.
        </para>
        <para>
            The <emphasis>smart refresh</emphasis> periodically downloads rules
            that are new or were modified after the last update. Its primary
            goal is to keep the database growing by fetching only small
            increments that do not generate large amounts of network traffic.
        </para>
        <para>
            The <emphasis>full refresh</emphasis> simply deletes all sudo rules
            stored in the cache and replaces them with all rules that are stored
            on the server. This is used to keep the cache consistent by removing
            every rule which was deleted from the server. However, full refresh
            may produce a lot of traffic and thus it should be run only
            occasionally depending on the size and stability of the sudo rules.
        </para>
        <para>
            The <emphasis>rules refresh</emphasis> ensures that we do not grant
            the user more permission than defined. It is triggered each time the
            user runs sudo. Rules refresh will find all rules that apply to this
            user, check their expiration time and redownload them if expired.
            In the case that any of these rules are missing on the server, the
            SSSD will do an out of band full refresh because more rules
            (that apply to other users) may have been deleted.
        </para>
        <para>
            If enabled, SSSD will store only rules that can be applied to this
            machine. This means rules that contain one of the following values
            in <emphasis>sudoHost</emphasis> attribute:
        </para>
        <itemizedlist>
            <listitem>
                <para>
                    keyword ALL
                </para>
            </listitem>
            <listitem>
                <para>
                    wildcard
                </para>
            </listitem>
            <listitem>
                <para>
                    netgroup (in the form "+netgroup")
                </para>
            </listitem>
            <listitem>
                <para>
                    hostname or fully qualified domain name of this machine
                </para>
            </listitem>
            <listitem>
                <para>
                    one of the IP addresses of this machine
                </para>
            </listitem>
            <listitem>
                <para>
                    one of the IP addresses of the network
                    (in the form "address/mask")
                </para>
            </listitem>
        </itemizedlist>
        <para>
            There are many configuration options that can be used to adjust
            the behavior. Please refer to "ldap_sudo_*" in
            <citerefentry>
                <refentrytitle>sssd-ldap</refentrytitle>
                <manvolnum>5</manvolnum>
            </citerefentry> and "sudo_*" in
            <citerefentry>
                <refentrytitle>sssd.conf</refentrytitle>
                <manvolnum>5</manvolnum>
            </citerefentry>.
        </para>
    </refsect1>

    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="include/seealso.xml" />

</refentry>
</reference>