source: networking/netprogs/wpa_supplicant.xml@ 5603a81

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY wpa_supplicant-download-http
  "http://hostap.epitest.fi/releases/wpa_supplicant-&wpa_supplicant-version;.tar.gz">
  <!ENTITY wpa_supplicant-md5sum        "f516f191384a9a546e3f5145c08addda">
  <!ENTITY wpa_supplicant-size          "1.6 MB">
  <!ENTITY wpa_supplicant-buildsize     "15 MB">
  <!ENTITY wpa_supplicant-time          "0.1 SBU">
]>

<sect1 id="wpa_supplicant" xreflabel="wpa_supplicant-&wpa_supplicant-version;">
  <?dbhtml filename="wpa_supplicant.html"?>

  <sect1info>
    <othername>$LastChangedBy$</othername>
    <date>$Date$</date>
  </sect1info>

  <title>wpa_supplicant-&wpa_supplicant-version;</title>

  <indexterm zone="wpa_supplicant">
    <primary sortas="a-wpa_supplicant">wpa_supplicant</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to wpa_supplicant</title>

    <para><application>wpa_supplicant</application> is a Wi-Fi Protected Access
    (WPA) client and IEEE 802.1X supplicant. It implements WPA key negotiation
    with a WPA Authenticator and Extensible Authentication Protocol (EAP)
    authentication with an Authentication Server. In addition, it controls the
    roaming and IEEE 802.11 authentication/association of the wireless LAN
    driver. This is useful for connecting to a password protected wireless
    access point.</para>

    &lfs71_checked;

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>Download (HTTP):
        <ulink url="&wpa_supplicant-download-http;"/></para>
      </listitem>
      <listitem>
        <para>Download MD5 sum: &wpa_supplicant-md5sum;</para>
      </listitem>
      <listitem>
        <para>Download size: &wpa_supplicant-size;</para>
      </listitem>
      <listitem>
        <para>Estimated disk space required: &wpa_supplicant-buildsize;</para>
      </listitem>
      <listitem>
        <para>Estimated build time: &wpa_supplicant-time;</para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Additional Downloads</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>Required patch: <ulink
        url="&patch-root;/wpa_supplicant-&wpa_supplicant-version;-libnl-3-fixes-1.patch"/></para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">wpa_supplicant Dependencies</bridgehead>

    <bridgehead renderas="sect4">Recommended</bridgehead>
    <para role="recommended"><xref linkend="libnl"/> (required to use the
    nl80211 kernel interface. Using <application>wpa_supplicant</application>
    without <application>libnl</application> has not been tested).</para>

    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional"><xref linkend="openssl"/>,
    <!-- using CONFIG_TLS=gnutls fails as
    src/crypto/tls_gnutls.c uses functions like gnutls_session_get_client_random
    and gnutls_session_get_server_random which have been removed from current
    <xref linkend="gnutls"/> -->
    <ulink url="http://libtom.org/">libtommath</ulink>,
    <xref linkend="libpcap"/>,
    <ulink url="http://libdnet.sourceforge.net/">libdnet</ulink>
    and <xref linkend="dbus"/>.</para>

    <para condition="html" role="usernotes">User Notes:
    <ulink url="&blfs-wiki;/wpa_supplicant"/></para>
  </sect2>

  <sect2 role="kernel" id="wpa_supplicant-kernel">
    <title>Kernel Configuration</title>

    <para>Enable the following options in the kernel configuration
    and recompile the kernel if necessary:</para>

<screen><literal>[*] Networking support  --->
  [*]   Wireless  --->
    [*]   cfg80211 - wireless configuration API
    [*]     cfg80211 wireless extensions compatibility
    [*]   Generic IEEE 802.11 Networking Stack (mac80211)

Device Drivers  --->
  [*] Network device support  --->
    [*]   Wireless LAN  --->
</literal></screen>

    <para>Select the options that support your hardware:
    <command>lspci</command> from <xref linkend="pciutils"/> is your friend
    ;)</para>

    <indexterm zone="wpa_supplicant wpa_supplicant-kernel">
      <primary sortas="d-wpa_supplicant">wpa_supplicant</primary>
    </indexterm>
  </sect2>

  <sect2 role="installation">
    <title>Installation of wpa_supplicant</title>

    <para>Install <application>wpa_supplicant</application> by running the
    following commands:</para>

<screen><userinput>patch -p1 &lt; ../wpa_supplicant-0.7.3-libnl-3-fixes-1.patch &amp;&amp;
cd wpa_supplicant &amp;&amp;
cat &gt; .config &lt;&lt; "HERE_DOC" &amp;&amp;
CONFIG_DRIVER_WEXT=y
CONFIG_EAP_GPSK=y
CONFIG_EAP_GPSK_SHA256=y
CONFIG_EAP_GTC=y
CONFIG_EAP_IKEV2=y
CONFIG_EAP_LEAP=y
CONFIG_EAP_MD5=y
CONFIG_EAP_MSCHAPV2=y
CONFIG_EAP_OTP=y
CONFIG_EAP_PAX=y
CONFIG_EAP_PEAP=y
CONFIG_EAP_PSK=y
CONFIG_EAP_TLS=y
CONFIG_EAP_TTLS=y
CONFIG_PEERKEY=y
CONFIG_PKCS12=y
CONFIG_CTRL_IFACE=y
CONFIG_READLINE=y
CONFIG_IPV6=y
CONFIG_LIBNL20=y
CONFIG_DRIVER_NL80211=y
CFLAGS += -I/usr/include/libnl3

# If you have not installed openssl, uncomment the next line:
# CONFIG_TLS=internal

# If you want to use the internal TLS and have
# not installed libtommath, uncomment the next line:
# CONFIG_INTERNAL_LIBTOMMATH=y

# Uncomment the next line if you have a ralink chipset:
# CONFIG_DRIVER_RALINK=y

# Uncomment the next line if you have an Agere Hermes chipset:
# CONFIG_DRIVER_HERMES=y

# Uncomment the next line if you have an Atmel chipset:
# CONFIG_DRIVER_ATMEL=y

# Uncomment the next line if you've installed dbus:
# CONFIG_CTRL_IFACE_DBUS_NEW=y

# Uncomment the next line if you've installed libpcap and libdnet:
# CONFIG_L2_PACKET=pcap
HERE_DOC
make</userinput></screen>

    <para>This package does not come with a test suite.</para>

    <para>Now, as the <systemitem class="username">root</systemitem>
    user:</para>

<screen role="root"><userinput>cp wpa_{cli,passphrase,supplicant} /sbin &amp;&amp;
cp doc/docbook/wpa_supplicant.conf.5 /usr/share/man/man5 &amp;&amp;
cp doc/docbook/wpa_{cli,passphrase,supplicant}.8 /usr/share/man/man8</userinput></screen>
  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <para><command>cat > .config ...</command>: This creates a default
    configuration that should work in most situations. It uses the WEXT kernel
    driver which most wireless cards seem to use. For an explanation of these
    options (and to see what other options you could choose) read the
    <filename>wpa_supplicant/defconfig</filename> file in the source.</para>
  </sect2>

  <sect2 role="configuration">
    <title>Configuring wpa_supplicant</title>

    <sect3 id="wpa_supplicant-config">
      <title>Config File</title>
      <para><filename>/etc/wpa_supplicant.conf</filename></para>

      <indexterm zone="wpa_supplicant wpa_supplicant-config">
        <primary
        sortas="e-etc-wpa_supplicant.conf">/etc/wpa_supplicant.conf</primary>
      </indexterm>
    </sect3>

    <sect3>
      <title>Configuration Information</title>

      <para>To connect to an access point that uses a password you need to put
      the pre-shared key in <filename>/etc/wpa_supplicant.conf</filename>. Use
      <command>wpa_passphrase</command> to generate this. SSID is the string
      that the access point/router transmits to identify itself. As the
      <systemitem class="username">root</systemitem> user:</para>

<screen role="root"><userinput>wpa_passphrase <replaceable>SSID</replaceable> <replaceable>SECRET_PASSWORD</replaceable> &gt; /etc/wpa_supplicant.conf</userinput></screen>

      <para>/etc/wpa_supplicant.conf can hold the details of several access
      points. When you run wpa_supplicant it will scan for the SSIDs it can see
      and choose the appropriate password to connect.</para>

      <para>If you want to connect to an access point that isn't password
      protected, put an entry like this in
      <filename>/etc/wpa_supplicant.conf</filename>. Replace
      "Some-SSID" with the SSID of the access point/router.</para>

<screen>network={
  ssid="<replaceable>Some-SSID</replaceable>"
  key_mgmt=NONE
}</screen>

      <para>There are many options that you could use to tweak how you connect
      to each access point. They are described in some detail in the
      <filename>wpa_supplicant/wpa_supplicant.conf</filename> file in the
      source.</para>

      <para>To use <command>wpa_cli</command> to control the running
      wpa_supplicant daemon, add a control interface to
      <filename>/etc/wpa_supplicant.conf</filename>. As the
      <systemitem class="username">root</systemitem> user:</para>

<screen role="root"><userinput>echo ctrl_interface=/run/wpa_supplicant &gt;&gt; /etc/wpa_supplicant.conf</userinput></screen>
    </sect3>

    <sect3>
      <title>Connecting to an Access Point</title>

      <para>If your router/access point uses DHCP to allocate IP addresses you
      can install <xref linkend="dhcpcd"/> and use it to connect. As the
      <systemitem class="username">root</systemitem> user:</para>

<screen role="root"><userinput>wpa_supplicant -B -c/etc/wpa_supplicant.conf -iwlan0 -Dwext
sleep 2 # let it settle
dhcpcd</userinput></screen>

      <para>Alternatively, you can use static addresses on your local network.
      This has the advantage that you can put the hostnames in
      <filename>/etc/hosts</filename>. Replace 192.168.1.6 with the static
      address you've chosen. Replace 192.168.1.1 with the local IP address of
      the access point/router. As the
      <systemitem class="username">root</systemitem> user:</para>

<screen role="root"><userinput>ip addr add 192.168.1.6 dev wlan0
ip link set wlan0 up
wpa_supplicant -B -c/etc/wpa_supplicant.conf -iwlan0 -Dwext
ip route add 192.168.1.1 dev wlan0
ip route add default via 192.168.1.1 dev wlan0</userinput></screen>

      <para>Writing a boot script that automates bringing up the network
      connection is left as an exercise for the reader ;).</para>
    </sect3>
  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>

      <seglistitem>
        <seg>wpa_supplicant, wpa_passphrase and wpa_cli</seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="wpa_supplicant-prog">
        <term><command>wpa_supplicant</command></term>
        <listitem>
          <para>is a daemon that can connect to a password protected wireless
          access point.</para>
          <indexterm zone="wpa_supplicant wpa_supplicant-prog">
            <primary sortas="b-wpa_supplicant">wpa_supplicant</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="wpa_passphrase">
        <term><command>wpa_passphrase</command></term>
        <listitem>
          <para>takes an SSID and a password and generates a simple
          configuration that <command>wpa_supplicant</command> can
          understand</para>
          <indexterm zone="wpa_supplicant wpa_passphrase">
            <primary sortas="b-wpa_passphrase">wpa_passphrase</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="wpa_cli">
        <term><command>wpa_cli</command></term>
        <listitem>
          <para>is a command line interface to control a running wpa_supplicant
          daemon</para>
          <indexterm zone="wpa_supplicant wpa_cli">
            <primary sortas="b-wpa_cli">wpa_cli</primary>
          </indexterm>
        </listitem>
      </varlistentry>
    </variablelist>
  </sect2>
</sect1>