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<samba:parameter name="passwd chat"
context="G"
type="string"
advanced="1" developer="1"
xmlns:samba="http://samba.org/common">
<description>
<para>This string controls the <emphasis>"chat"</emphasis>
conversation that takes places between <citerefentry><refentrytitle>smbd</refentrytitle>
<manvolnum>8</manvolnum></citerefentry> and the local password changing
program to change the user's password. The string describes a
sequence of response-receive pairs that <citerefentry><refentrytitle>smbd</refentrytitle>
<manvolnum>8</manvolnum></citerefentry> uses to determine what to send to the
<link linkend="PASSWDPROGRAM"><parameter moreinfo="none">passwd program</parameter>
</link> and what to expect back. If the expected output is not
received then the password is not changed.</para>
<para>This chat sequence is often quite site specific, depending
on what local methods are used for password control (such as NIS
etc).</para>
<para>Note that this parameter only is only used if the <link
linkend="UNIXPASSWORDSYNC"> <parameter moreinfo="none">unix password sync</parameter>
</link> parameter is set to <constant>yes</constant>. This sequence is
then called <emphasis>AS ROOT</emphasis> when the SMB password in the
smbpasswd file is being changed, without access to the old password
cleartext. This means that root must be able to reset the user's password without
knowing the text of the previous password. In the presence of
NIS/YP, this means that the <link linkend="PASSWDPROGRAM">passwd program</link> must
be executed on the NIS master.
</para>
<para>The string can contain the macro <parameter moreinfo="none">%n</parameter> which is substituted
for the new password. The chat sequence can also contain the standard
macros \n, \r, \t and \s to
give line-feed, carriage-return, tab and space. The chat sequence string can also contain
a '*' which matches any sequence of characters. Double quotes can be used to collect strings with spaces
in them into a single string.</para>
<para>If the send string in any part of the chat sequence is a full
stop ".", then no string is sent. Similarly, if the
expect string is a full stop then no string is expected.</para>
<para>If the <link linkend="PAMPASSWORDCHANGE"><parameter moreinfo="none">pam
password change</parameter></link> parameter is set to <constant>yes</constant>, the chat pairs
may be matched in any order, and success is determined by the PAM result,
not any particular output. The \n macro is ignored for PAM conversions.
</para>
</description>
<related>unix password sync</related>
<related>passwd program</related>
<related>passwd chat debug</related>
<related>pam password change</related>
<value type="default">*new*password* %n\n*new*password* %n\n *changed*</value>
<value type="example">"*Enter OLD password*" %o\n "*Enter NEW password*" %n\n "*Reenter NEW password*" %n\n "*Password changed*"</value>
</samba:parameter>
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