148 lines
5.1 KiB
Text
148 lines
5.1 KiB
Text
<!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
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<refentry>
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<refmeta>
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<refentrytitle>wpa_priv</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>wpa_priv</refname>
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<refpurpose>wpa_supplicant privilege separation helper</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>wpa_priv</command>
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<arg>-c <replaceable>ctrl path</replaceable></arg>
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<arg>-Bdd</arg>
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<arg>-P <replaceable>pid file</replaceable></arg>
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<arg>driver:ifname <replaceable>[driver:ifname ...]</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Overview</title>
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<para><command>wpa_priv</command> is a privilege separation helper that
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minimizes the size of <command>wpa_supplicant</command> code that needs
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to be run with root privileges.</para>
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<para>If enabled, privileged operations are done in the wpa_priv process
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while leaving rest of the code (e.g., EAP authentication and WPA
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handshakes) to operate in an unprivileged process (wpa_supplicant) that
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can be run as non-root user. Privilege separation restricts the effects
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of potential software errors by containing the majority of the code in an
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unprivileged process to avoid the possibility of a full system
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compromise.</para>
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<para><command>wpa_priv</command> needs to be run with network admin
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privileges (usually, root user). It opens a UNIX domain socket for each
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interface that is included on the command line; any other interface will
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be off limits for <command>wpa_supplicant</command> in this kind of
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configuration. After this, <command>wpa_supplicant</command> can be run as
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a non-root user (e.g., all standard users on a laptop or as a special
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non-privileged user account created just for this purpose to limit access
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to user files even further).</para>
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</refsect1>
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<refsect1>
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<title>Example configuration</title>
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<para>The following steps are an example of how to configure
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<command>wpa_priv</command> to allow users in the
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<emphasis>wpapriv</emphasis> group to communicate with
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<command>wpa_supplicant</command> with privilege separation:</para>
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<para>Create user group (e.g., wpapriv) and assign users that
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should be able to use wpa_supplicant into that group.</para>
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<para>Create /var/run/wpa_priv directory for UNIX domain sockets and
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control user access by setting it accessible only for the wpapriv
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group:</para>
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<blockquote><programlisting>
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mkdir /var/run/wpa_priv
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chown root:wpapriv /var/run/wpa_priv
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chmod 0750 /var/run/wpa_priv
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</programlisting></blockquote>
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<para>Start <command>wpa_priv</command> as root (e.g., from system
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startup scripts) with the enabled interfaces configured on the
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command line:</para>
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<blockquote><programlisting>
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wpa_priv -B -c /var/run/wpa_priv -P /var/run/wpa_priv.pid wext:wlan0
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</programlisting></blockquote>
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<para>Run <command>wpa_supplicant</command> as non-root with a user
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that is in the wpapriv group:</para>
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<blockquote><programlisting>
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wpa_supplicant -i ath0 -c wpa_supplicant.conf
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</programlisting></blockquote>
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</refsect1>
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<refsect1>
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<title>Command Arguments</title>
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<variablelist>
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<varlistentry>
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<term>-c ctrl path</term>
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<listitem><para>Specify the path to wpa_priv control directory
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(Default: /var/run/wpa_priv/).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>-B</term>
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<listitem><para>Run as a daemon in the background.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>-P file</term>
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<listitem><para>Set the location of the PID
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file.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>driver:ifname [driver:ifname ...]</term>
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<listitem><para>The <driver> string dictates which of the
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supported <command>wpa_supplicant</command> driver backends is to be
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used. To get a list of supported driver types see wpa_supplicant help
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(e.g, wpa_supplicant -h). The driver backend supported by most good
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drivers is <emphasis>wext</emphasis>.</para>
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<para>The <ifname> string specifies which network
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interface is to be managed by <command>wpa_supplicant</command>
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(e.g., wlan0 or ath0).</para>
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<para><command>wpa_priv</command> does not use the network interface
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before <command>wpa_supplicant</command> is started, so it is fine to
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include network interfaces that are not available at the time wpa_priv
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is started. wpa_priv can control multiple interfaces with one process,
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but it is also possible to run multiple <command>wpa_priv</command>
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processes at the same time, if desired.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry>
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<refentrytitle>wpa_supplicant</refentrytitle>
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<manvolnum>8</manvolnum>
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</citerefentry>
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</para>
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</refsect1>
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<refsect1>
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<title>Legal</title>
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<para>wpa_supplicant is copyright (c) 2003-2014,
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Jouni Malinen <email>j@w1.fi</email> and
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contributors.
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All Rights Reserved.</para>
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<para>This program is licensed under the BSD license (the one with
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advertisement clause removed).</para>
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</refsect1>
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</refentry>
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