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man: move NFTSec= entry to "Network Accouting and Control" section
Currently it is in the "Memory Pressure and Control" section, which does not seem accurate.
This commit is contained in:
Nick Rosbrook
parent
097e28736a
commit
a90f80c7e7
@ -1005,6 +1005,92 @@ RestrictNetworkInterfaces=~eth1</programlisting>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>NFTSet=</varname><replaceable>family</replaceable>:<replaceable>table</replaceable>:<replaceable>set</replaceable></term>
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<listitem>
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<para>This setting provides a method for integrating dynamic cgroup, user and group IDs into
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firewall rules with <ulink url="https://netfilter.org/projects/nftables/index.html">NFT</ulink>
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sets. The benefit of using this setting is to be able to use the IDs as selectors in firewall rules
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easily and this in turn allows more fine grained filtering. NFT rules for cgroup matching use
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numeric cgroup IDs, which change every time a service is restarted, making them hard to use in
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systemd environment otherwise. Dynamic and random IDs used by <varname>DynamicUser=</varname> can
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be also integrated with this setting.</para>
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<para>This option expects a whitespace separated list of NFT set definitions. Each definition
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consists of a colon-separated tuple of source type (one of <literal>cgroup</literal>,
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<literal>user</literal> or <literal>group</literal>), NFT address family (one of
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<literal>arp</literal>, <literal>bridge</literal>, <literal>inet</literal>, <literal>ip</literal>,
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<literal>ip6</literal>, or <literal>netdev</literal>), table name and set name. The names of tables
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and sets must conform to lexical restrictions of NFT table names. The type of the element used in
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the NFT filter must match the type implied by the directive (<literal>cgroup</literal>,
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<literal>user</literal> or <literal>group</literal>) as shown in the table below. When a control
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group or a unit is realized, the corresponding ID will be appended to the NFT sets and it will be
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be removed when the control group or unit is removed. <command>systemd</command> only inserts
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elements to (or removes from) the sets, so the related NFT rules, tables and sets must be prepared
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elsewhere in advance. Failures to manage the sets will be ignored.</para>
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<table>
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<title>Defined <varname>source type</varname> values</title>
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<tgroup cols='3'>
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<colspec colname='source type'/>
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<colspec colname='description'/>
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<colspec colname='NFT type name'/>
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<thead>
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<row>
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<entry>Source type</entry>
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<entry>Description</entry>
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<entry>Corresponding NFT type name</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><literal>cgroup</literal></entry>
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<entry>control group ID</entry>
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<entry><literal>cgroupsv2</literal></entry>
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</row>
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<row>
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<entry><literal>user</literal></entry>
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<entry>user ID</entry>
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<entry><literal>meta skuid</literal></entry>
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</row>
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<row>
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<entry><literal>group</literal></entry>
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<entry>group ID</entry>
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<entry><literal>meta skgid</literal></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>If the firewall rules are reinstalled so that the contents of NFT sets are destroyed, command
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<command>systemctl daemon-reload</command> can be used to refill the sets.</para>
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<para>Example:
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<programlisting>[Unit]
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NFTSet=cgroup:inet:filter:my_service user:inet:filter:serviceuser
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</programlisting>
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Corresponding NFT rules:
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<programlisting>table inet filter {
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set my_service {
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type cgroupsv2
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}
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set serviceuser {
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typeof meta skuid
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}
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chain x {
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socket cgroupv2 level 2 @my_service accept
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drop
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}
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chain y {
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meta skuid @serviceuser accept
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drop
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}
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}</programlisting>
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</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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</variablelist>
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</refsect2><refsect2><title>BPF Programs</title>
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@ -1500,92 +1586,6 @@ DeviceAllow=/dev/loop-control
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<xi:include href="version-info.xml" xpointer="v254"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>NFTSet=</varname><replaceable>family</replaceable>:<replaceable>table</replaceable>:<replaceable>set</replaceable></term>
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<listitem>
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<para>This setting provides a method for integrating dynamic cgroup, user and group IDs into
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firewall rules with <ulink url="https://netfilter.org/projects/nftables/index.html">NFT</ulink>
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sets. The benefit of using this setting is to be able to use the IDs as selectors in firewall rules
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easily and this in turn allows more fine grained filtering. NFT rules for cgroup matching use
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numeric cgroup IDs, which change every time a service is restarted, making them hard to use in
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systemd environment otherwise. Dynamic and random IDs used by <varname>DynamicUser=</varname> can
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be also integrated with this setting.</para>
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<para>This option expects a whitespace separated list of NFT set definitions. Each definition
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consists of a colon-separated tuple of source type (one of <literal>cgroup</literal>,
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<literal>user</literal> or <literal>group</literal>), NFT address family (one of
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<literal>arp</literal>, <literal>bridge</literal>, <literal>inet</literal>, <literal>ip</literal>,
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<literal>ip6</literal>, or <literal>netdev</literal>), table name and set name. The names of tables
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and sets must conform to lexical restrictions of NFT table names. The type of the element used in
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the NFT filter must match the type implied by the directive (<literal>cgroup</literal>,
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<literal>user</literal> or <literal>group</literal>) as shown in the table below. When a control
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group or a unit is realized, the corresponding ID will be appended to the NFT sets and it will be
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be removed when the control group or unit is removed. <command>systemd</command> only inserts
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elements to (or removes from) the sets, so the related NFT rules, tables and sets must be prepared
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elsewhere in advance. Failures to manage the sets will be ignored.</para>
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<table>
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<title>Defined <varname>source type</varname> values</title>
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<tgroup cols='3'>
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<colspec colname='source type'/>
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<colspec colname='description'/>
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<colspec colname='NFT type name'/>
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<thead>
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<row>
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<entry>Source type</entry>
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<entry>Description</entry>
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<entry>Corresponding NFT type name</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><literal>cgroup</literal></entry>
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<entry>control group ID</entry>
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<entry><literal>cgroupsv2</literal></entry>
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</row>
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<row>
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<entry><literal>user</literal></entry>
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<entry>user ID</entry>
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<entry><literal>meta skuid</literal></entry>
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</row>
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<row>
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<entry><literal>group</literal></entry>
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<entry>group ID</entry>
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<entry><literal>meta skgid</literal></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>If the firewall rules are reinstalled so that the contents of NFT sets are destroyed, command
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<command>systemctl daemon-reload</command> can be used to refill the sets.</para>
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<para>Example:
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<programlisting>[Unit]
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NFTSet=cgroup:inet:filter:my_service user:inet:filter:serviceuser
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</programlisting>
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Corresponding NFT rules:
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<programlisting>table inet filter {
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set my_service {
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type cgroupsv2
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}
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set serviceuser {
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typeof meta skuid
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}
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chain x {
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socket cgroupv2 level 2 @my_service accept
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drop
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}
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chain y {
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meta skuid @serviceuser accept
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drop
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}
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}</programlisting>
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</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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</refsect1>
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