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64b720d284
Signed-off-by: Michael Adam <obnox@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
58 lines
3.7 KiB
XML
58 lines
3.7 KiB
XML
<samba:parameter name="bind interfaces only"
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type="boolean"
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context="G"
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xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
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<description>
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<para>This global parameter allows the Samba admin
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to limit what interfaces on a machine will serve SMB requests. It
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affects file service <citerefentry><refentrytitle>smbd</refentrytitle>
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<manvolnum>8</manvolnum></citerefentry> and name service <citerefentry><refentrytitle>nmbd</refentrytitle>
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<manvolnum>8</manvolnum></citerefentry> in a slightly different ways.</para>
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<para>
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For name service it causes <command moreinfo="none">nmbd</command> to bind to ports 137 and 138 on the
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interfaces listed in the <smbconfoption name="interfaces"/> parameter. <command moreinfo="none">nmbd</command>
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also binds to the "all addresses" interface (0.0.0.0) on ports 137 and 138 for the purposes of
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reading broadcast messages. If this option is not set then <command moreinfo="none">nmbd</command> will
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service name requests on all of these sockets. If <smbconfoption name="bind interfaces only"/> is set then
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<command moreinfo="none">nmbd</command> will check the source address of any packets coming in on the
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broadcast sockets and discard any that don't match the broadcast addresses of the interfaces in the
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<smbconfoption name="interfaces"/> parameter list. As unicast packets are received on the other sockets it
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allows <command moreinfo="none">nmbd</command> to refuse to serve names to machines that send packets that
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arrive through any interfaces not listed in the <smbconfoption name="interfaces"/> list. IP Source address
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spoofing does defeat this simple check, however, so it must not be used seriously as a security feature for
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<command moreinfo="none">nmbd</command>.
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</para>
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<para>
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For file service it causes <citerefentry><refentrytitle>smbd</refentrytitle>
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<manvolnum>8</manvolnum></citerefentry> to bind only to the interface list given in the <smbconfoption
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name="interfaces"/> parameter. This restricts the networks that <command moreinfo="none">smbd</command> will
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serve, to packets coming in on those interfaces. Note that you should not use this parameter for machines that
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are serving PPP or other intermittent or non-broadcast network interfaces as it will not cope with
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non-permanent interfaces.
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</para>
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<para>
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If <smbconfoption name="bind interfaces only"/> is set and the network address
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<emphasis>127.0.0.1</emphasis> is not added to the <smbconfoption name="interfaces"/> parameter list
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<citerefentry><refentrytitle>smbpasswd</refentrytitle> <manvolnum>8</manvolnum></citerefentry> may not
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work as expected due to the reasons covered below.
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</para>
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<para>
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To change a users SMB password, the <command moreinfo="none">smbpasswd</command> by default connects to the
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<emphasis>localhost - 127.0.0.1</emphasis> address as an SMB client to issue the password change request. If
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<smbconfoption name="bind interfaces only"/> is set then unless the network address
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<emphasis>127.0.0.1</emphasis> is added to the <smbconfoption name="interfaces"/> parameter list then <command
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moreinfo="none"> smbpasswd</command> will fail to connect in it's default mode. <command
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moreinfo="none">smbpasswd</command> can be forced to use the primary IP interface of the local host by using
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its <citerefentry><refentrytitle>smbpasswd</refentrytitle> <manvolnum>8</manvolnum></citerefentry> <parameter
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moreinfo="none">-r <replaceable>remote machine</replaceable></parameter> parameter, with <replaceable>remote
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machine</replaceable> set to the IP name of the primary interface of the local host.
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</para>
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</description>
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<value type="default">no</value>
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</samba:parameter>
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