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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<refentry id="cifs.upcall.8">
<refmeta>
<refentrytitle>cifs.upcall</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="source">Samba</refmiscinfo>
<refmiscinfo class="manual">System Administration tools</refmiscinfo>
<refmiscinfo class="version">3.2</refmiscinfo>
</refmeta>
<refnamediv>
<refname>cifs.upcall</refname>
<refpurpose>Userspace upcall helper for Common Internet File System (CIFS)</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis sepchar=" ">
<literal>cifs.upcall</literal>
<arg choice="opt" rep="norepeat">-c</arg>
<arg choice="opt" rep="norepeat">-v</arg>
<arg choice="req" rep="norepeat">keyid</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>DESCRIPTION</title>
<para>This tool is part of the <citerefentry><refentrytitle>samba</refentrytitle>
<manvolnum>7</manvolnum></citerefentry> suite.</para>
<para>cifs.upcall is a userspace helper program for the linux CIFS client
filesystem. There are a number of activities that the kernel cannot easily
do itself. This program is a callout program that does these things for the
kernel and then returns the result.</para>
<para>cifs.upcall is generally intended to be run when the kernel calls
request-key<manvolnum>8</manvolnum> for a particular key type. While it
can be run directly from the command-line, it's not generally intended
to be run that way.</para>
</refsect1>
<refsect1>
<title>OPTIONS</title>
<variablelist>
<varlistentry>
<term>-c</term>
<listitem><para>When handling a kerberos upcall, use a service principal that starts with "cifs/". The default is to use the "host/" service principal.
</para></listitem>
</varlistentry>
<varlistentry>
<term>-v</term>
<listitem><para>Print version number and exit.
</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>CONFIGURATION FOR KEYCTL</title>
<para>cifs.upcall is designed to be called from the kernel via the
request-key callout program. This requires that request-key be told
where and how to call this program. The current cifs.upcall program
handles two different key types:
</para>
<variablelist>
<varlistentry>
<term>cifs.spnego</term>
<listitem><para>This keytype is for retrieving kerberos session keys
</para></listitem>
</varlistentry>
<varlistentry>
<term>dns_resolver</term>
<listitem><para>This key type is for resolving hostnames into IP addresses
</para></listitem>
</varlistentry>
</variablelist>
<para>To make this program useful for CIFS, you'll need to set up entries for them in request-key.conf<manvolnum>5</manvolnum>. Here's an example of an entry for each key type:</para>
<programlisting format="linespecific">
#OPERATION TYPE D C PROGRAM ARG1 ARG2...
#========= ============= = = ==========================================
create cifs.spnego * * /usr/local/sbin/cifs.upcall -c %k
create dns_resolver * * /usr/local/sbin/cifs.upcall %k
</programlisting>
<para>
See <citerefentry><refentrytitle>request-key.conf<manvolnum>5</manvolnum></refentrytitle></citerefentry> for more info on each field.
</para>
</refsect1>
<refsect1>
<title>SEE ALSO</title>
<para>
<citerefentry><refentrytitle>request-key.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>mount.cifs</refentrytitle>
<manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
<refsect1>
<title>AUTHOR</title>
<para>Igor Mammedov wrote the cifs.upcall program.</para>
<para>Jeff Layton authored this manpage.</para>
<para>The maintainer of the Linux CIFS VFS is Steve French.</para>
<para>The <ulink url="mailto:linux-cifs-client@lists.samba.org">Linux
CIFS Mailing list</ulink> is the preferred place to ask
questions regarding these programs.
</para>
</refsect1>
</refentry>
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