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encryption algorithm is chosen for the passwords. Document the new -c and -s options. Add a reference to login.defs(5). * man/login.defs.5.xml: Document the ENCRYPT_METHOD, MD5_CRYPT_ENAB, SHA_CRYPT_MIN_ROUNDS, and SHA_CRYPT_MAX_ROUNDS variables. * etc/login.defs: Indicate that MD5_CRYPT_ENAB is deprecated. Document the relationship with PAM for MD5_CRYPT_ENAB and ENCRYPT_METHOD.
139 lines
4.0 KiB
XML
139 lines
4.0 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<refentry id='chgpasswd.8'>
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<!-- $Id$ -->
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<refmeta>
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<refentrytitle>chgpasswd</refentrytitle>
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<manvolnum>8</manvolnum>
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<refmiscinfo class="sectdesc">System Management Commands</refmiscinfo>
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</refmeta>
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<refnamediv id='name'>
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<refname>chgpasswd</refname>
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<refpurpose>update group passwords in batch mode</refpurpose>
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</refnamediv>
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<refsynopsisdiv id='synopsis'>
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<cmdsynopsis>
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<command>chgpasswd</command>
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<arg choice='opt'>
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<replaceable>options</replaceable>
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</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1 id='description'>
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<title>DESCRIPTION</title>
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<para>
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The <command>chgpasswd</command> command reads a list of group name
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and password pairs from standard input and uses this information to
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update a set of existing groups. Each line is of the format:
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</para>
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<para>
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<emphasis remap='I'>group_name</emphasis>:<emphasis
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remap='I'>password</emphasis>
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</para>
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<para>
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By default the supplied password must be in clear-text. Default
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encryption algorithm is DES.
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</para>
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<para>
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The default encryption algorithm can be defined for the system with
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the ENCRYPT_METHOD variable of <filename>/etc/login.defs</filename>,
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and can be overwiten with the <option>-e</option>,
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<option>-m</option>, or <option>-c</option> options.
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</para>
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<para>
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This command is intended to be used in a large system environment
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where many accounts are created at a single time.
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</para>
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</refsect1>
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<refsect1 id='options'>
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<title>OPTIONS</title>
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<para>
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The options which apply to the <command>chgpasswd</command> command
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are:
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</para>
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<variablelist remap='IP'>
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<varlistentry>
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<term><option>-c</option>, <option>--crypt-method</option></term>
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<listitem>
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<para>Use the specified method to encrypt the passwords.</para>
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<para>
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The available methods are DES, MD5, and SHA256 or SHA512
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if compiled with the ENCRYPTMETHOD_SELECT flag.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-e</option>, <option>--encrypted</option></term>
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<listitem>
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<para>Supplied passwords are in encrypted form.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-h</option>, <option>--help</option></term>
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<listitem>
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<para>Display help message and exit.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-m</option>, <option>--md5</option></term>
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<listitem>
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<para>
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Use MD5 encryption instead of DES when the supplied passwords are
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not encrypted.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-s</option>, <option>--sha-rounds</option></term>
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<listitem>
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<para>
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Use the specified number of rounds to encrypt the passwords.
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</para>
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<para>
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The value 0 means that the system will choose the default
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number of rounds for the crypt method (5000).
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</para>
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<para>
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A minimal value of 1000 and a maximal value of 999,999,999
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will be enforced.
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</para>
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<para>
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You can only use this option with the SHA256 or SHA512
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crypt method.
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</para>
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<para>
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By default, the number of rounds is defined by the
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SHA_CRYPT_MIN_ROUNDS and SHA_CRYPT_MAX_ROUNDS variables in
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<filename>/etc/login.defs</filename>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id='caveats'>
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<title>CAVEATS</title>
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<para>
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Remember to set permissions or umask to prevent readability of
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unencrypted files by other users.
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</para>
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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>gpasswd</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>groupadd</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>login.defs</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry>.
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</para>
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</refsect1>
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</refentry>
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