1 <samba:parameter name="passwd chat"
5 xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
7 <para>This string controls the <emphasis>"chat"</emphasis>
8 conversation that takes places between <citerefentry><refentrytitle>smbd</refentrytitle>
9 <manvolnum>8</manvolnum></citerefentry> and the local password changing
10 program to change the user's password. The string describes a
11 sequence of response-receive pairs that <citerefentry><refentrytitle>smbd</refentrytitle>
12 <manvolnum>8</manvolnum></citerefentry> uses to determine what to send to the
13 <smbconfoption name="passwd program"/> and what to expect back. If the expected output is not
14 received then the password is not changed.</para>
16 <para>This chat sequence is often quite site specific, depending
17 on what local methods are used for password control.</para>
19 <para>Note that this parameter only is used if the <smbconfoption
20 name="unix password sync"/> parameter is set to <constant>yes</constant>. This sequence is
21 then called <emphasis>AS ROOT</emphasis> when the SMB password in the
22 smbpasswd file is being changed, without access to the old password
23 cleartext. This means that root must be able to reset the user's password without
24 knowing the text of the previous password.
27 <para>The string can contain the macro <parameter
28 moreinfo="none">%n</parameter> which is substituted
29 for the new password. The old password (<parameter
30 moreinfo="none">%o</parameter>) is only available when
31 <smbconfoption name="encrypt passwords"/> has been disabled.
32 The chat sequence can also contain the standard macros
33 \n, \r, \t and \s to give line-feed, carriage-return, tab
34 and space. The chat sequence string can also contain
35 a '*' which matches any sequence of characters. Double quotes can
36 be used to collect strings with spaces in them into a single
39 <para>If the send string in any part of the chat sequence is a full
40 stop ".", then no string is sent. Similarly, if the
41 expect string is a full stop then no string is expected.</para>
43 <para>If the <smbconfoption name="pam password change"/> parameter is set to <constant>yes</constant>, the
44 chat pairs may be matched in any order, and success is determined by the PAM result, not any particular
45 output. The \n macro is ignored for PAM conversions.
50 <related>unix password sync</related>
51 <related>passwd program</related>
52 <related>passwd chat debug</related>
53 <related>pam password change</related>
55 <value type="default">*new*password* %n\n *new*password* %n\n *changed*</value>
56 <value type="example">"*Enter NEW password*" %n\n "*Reenter NEW password*" %n\n "*Password changed*"</value>