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man: add AmbientCapabilities entry.

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Ismo Puustinen 2016-01-11 09:36:14 +02:00
parent 70d7aea5c7
commit ece87975a9
1 changed files with 29 additions and 0 deletions
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man/systemd.exec.xml
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@ -806,6 +806,35 @@
settings.</para></listitem> settings.</para></listitem>
</varlistentry> </varlistentry>
<varlistentry>
<term><varname>AmbientCapabilities=</varname></term>
<listitem><para>Controls which capabilities to include in the
ambient capability set for the executed process. Takes a
whitespace-separated list of capability names as read by
<citerefentry project='mankier'><refentrytitle>cap_from_name</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
e.g. <constant>CAP_SYS_ADMIN</constant>,
<constant>CAP_DAC_OVERRIDE</constant>,
<constant>CAP_SYS_PTRACE</constant>. This option may appear more than
once in which case the ambient capability sets are merged.
If the list of capabilities is prefixed with <literal>~</literal>, all
but the listed capabilities will be included, the effect of the
assignment inverted. If the empty string is
assigned to this option, the ambient capability set is reset to
the empty capability set, and all prior settings have no effect.
If set to <literal>~</literal> (without any further argument), the
ambient capability set is reset to the full set of available
capabilities, also undoing any previous settings. Note that adding
capabilities to ambient capability set adds them to the process's
inherited capability set.
</para><para>
Ambient capability sets are useful if you want to execute a process
as a non-privileged user but still want to give it some capabilities.
Note that in this case option <constant>keep-caps</constant> is
automatically added to <varname>SecureBits=</varname> to retain the
capabilities over the user change.</para></listitem>
</varlistentry>
<varlistentry> <varlistentry>
<term><varname>SecureBits=</varname></term> <term><varname>SecureBits=</varname></term>
<listitem><para>Controls the secure bits set for the executed <listitem><para>Controls the secure bits set for the executed