129 lines
4.4 KiB
XML
129 lines
4.4 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
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<refentry id='shadow.5'>
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<!-- $Id: shadow.5.xml,v 1.5 2005/04/27 16:44:12 kloczek Exp $ -->
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<refmeta>
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<refentrytitle>shadow</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv id='name'>
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<refname>shadow</refname>
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<refpurpose>encrypted password file</refpurpose>
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</refnamediv>
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<refsect1 id='description'>
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<title>DESCRIPTION</title>
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<para>
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<emphasis remap='I'>shadow</emphasis> contains the encrypted
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password information for user's accounts
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and optional the password aging information. Included is
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</para>
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<para>Login name</para>
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<para>Encrypted password</para>
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<para>Days since Jan 1, 1970 that password was last changed</para>
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<para>Days before password may be changed</para>
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<para>Days after which password must be changed</para>
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<para>Days before password is to expire that user is warned</para>
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<para>Days after password expires that account is disabled</para>
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<para>Days since Jan 1, 1970 that account is disabled</para>
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<para>A reserved field</para>
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<para>The password field must be filled. The encryped password consists
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of 13 to 24 characters from the 64 characters alphabet a thru z, A
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thru Z, 0 thru 9, \. and /. Optionally it can start with a "$"
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character. This means the encrypted password was generated using
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another (not DES) algorithm. For example if it starts with "$1$" it
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means the MD5-based algorithm was used.
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</para>
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<para>
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Refer to
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<citerefentry>
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<refentrytitle>crypt</refentrytitle><manvolnum>3</manvolnum>
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</citerefentry>
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for details on how this string is interpreted.
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</para>
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<para>The date of the last password change is given as the number of
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days since Jan 1, 1970. The password may not be changed again until
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the proper number of days have passed, and must be changed after the
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maximum number of days. If the minimum number of days required is
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greater than the maximum number of day allowed, this password may not
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be changed by the user.
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</para>
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<para>An account is considered to be inactive and is disabled if the
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password is not changed within the specified number of days after the
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password expires. An account will also be disabled on the specified
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day regardless of other password expiration information.
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</para>
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<para>This information supercedes any password or password age
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information present in <filename>/etc/passwd</filename>.
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</para>
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<para>This file must not be readable by regular users if password
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security is to be maintained.
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</para>
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</refsect1>
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<refsect1 id='files'>
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<title>FILES</title>
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<variablelist>
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<varlistentry>
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<term><filename>/etc/passwd</filename></term>
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<listitem>user account information</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/shadow</filename></term>
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<listitem>secure user account information</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id='see_also'>
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<title>SEE ALSO</title>
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<para>
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<citerefentry>
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<refentrytitle>chage</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>login</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>passwd</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>su</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>passwd</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>pwconv</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>pwunconv</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>sulogin</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>
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</para>
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</refsect1>
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<refsect1 id='author'>
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<title>AUTHOR</title>
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<para>Julianne Frances Haugh (jockgrrl@ix.netcom.com)</para>
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</refsect1>
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</refentry>
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