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<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" [
<!ENTITY version SYSTEM "../version.xml">
]>
<refentry id="pkcheck.1" xmlns:xi="http://www.w3.org/2003/XInclude">
<refentryinfo>
<title>pkcheck</title>
<date>May 2009</date>
<productname>polkit</productname>
</refentryinfo>
<refmeta>
<refentrytitle>pkcheck</refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo class="version"></refmiscinfo>
</refmeta>
<refnamediv>
<refname>pkcheck</refname>
<refpurpose>Check whether a process is authorized</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>pkcheck</command>
<arg><option>--version</option></arg>
<arg><option>--help</option></arg>
</cmdsynopsis>
<cmdsynopsis>
<command>pkcheck</command>
<arg><option>--list-temp</option></arg>
</cmdsynopsis>
<cmdsynopsis>
<command>pkcheck</command>
<arg><option>--revoke-temp</option></arg>
</cmdsynopsis>
<cmdsynopsis>
<command>pkcheck</command>
<arg choice="plain">
<option>--action-id</option>
<replaceable>action</replaceable>
</arg>
<group choice="req">
<arg choice="plain">
<option>--process</option>
<group choice="req">
<arg choice="plain">
<replaceable>pid</replaceable>
</arg>
<arg choice="plain">
<replaceable>pid,pid-start-time</replaceable>
</arg>
<arg choice="plain">
<replaceable>pid,pid-start-time,uid</replaceable>
</arg>
</group>
</arg>
<arg choice="plain">
<option>--system-bus-name</option>
<replaceable>busname</replaceable>
</arg>
</group>
<group>
<arg choice="plain">
<option>--allow-user-interaction</option>
</arg>
</group>
<group>
<arg choice="plain">
<option>--enable-internal-agent</option>
</arg>
</group>
<group rep="repeat">
<arg choice="plain">
<option>--detail</option>
<replaceable>key</replaceable>
<replaceable>value</replaceable>
</arg>
</group>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id="pkcheck-descsription">
<title>DESCRIPTION</title>
<para>
<command>pkcheck</command> is used to check whether a process, specified by
either <option>--process</option> (see below) or <option>--system-bus-name</option>,
is authorized for <replaceable>action</replaceable>. The <option>--detail</option>
option can be used zero or more times to pass details about <replaceable>action</replaceable>.
If <option>--allow-user-interaction</option> is passed, <command>pkcheck</command> blocks
while waiting for authentication.
</para>
<para>
The invocation <command>pkcheck --list-temp</command> will list
all temporary authorizations for the current session and
<command>pkcheck --revoke-temp</command> will revoke all
temporary authorizations for the current session.
</para>
<para>
This command is a simple wrapper around the polkit D-Bus interface; see the
D-Bus interface documentation for details.
</para>
</refsect1>
<refsect1 id="pkcheck-return-value">
<title>RETURN VALUE</title>
<para>
If the specified process is
authorized, <command>pkcheck</command> exits with a return value
of 0. If the authorization result contains any details, these
are printed on standard output as key/value pairs using
environment style reporting, e.g. first the key followed by a an equal sign, then the
value followed by a newline.
<programlisting>
KEY1=VALUE1
KEY2=VALUE2
KEY3=VALUE3
...</programlisting>
Octets that are not in [a-zA-Z0-9_] are escaped using octal codes prefixed
with <emphasis>\</emphasis>.
For example, the UTF-8 string <emphasis>føl,你好</emphasis> will be printed
as <emphasis>f\303\270l\54\344\275\240\345\245\275</emphasis>.
</para>
<para>
If the specified process is not
authorized, <command>pkcheck</command> exits with a return value
of 1 and a diagnostic message is printed on standard error. Details
are printed on standard output.
</para>
<para>
If the specified process is not
authorized because no suitable authentication agent is available or if the
<option>--allow-user-interaction</option> wasn't passed, <command>pkcheck</command>
exits with a return value of 2 and a diagnostic message is printed on standard error.
Details are printed on standard output.
</para>
<para>
If the specified process is not authorized because the
authentication dialog / request was dismissed by the user,
<command>pkcheck</command> exits with a return value of 3 and a
diagnostic message is printed on standard error. Details are
printed on standard output.
</para>
<para>
If an error occurred while checking for authorization, <command>pkcheck</command> exits
with a return value of 127 with a diagnostic message printed on standard error.
</para>
<para>
If one or more of the options passed are malformed, <command>pkcheck</command> exits
with a return value of 126. If stdin is a tty, then this manual page is also shown.
</para>
</refsect1>
<refsect1 id="pkcheck-notes">
<title>NOTES</title>
<para>
Do not use either the bare <replaceable>pid</replaceable> or
<replaceable>pid,start-time</replaceable> syntax forms for
<option>--process</option>. There are race conditions in both.
New code should always use
<replaceable>pid,pid-start-time,uid</replaceable>. The value of
<replaceable>start-time</replaceable> can be determined by
consulting e.g. the
<citerefentry><refentrytitle>proc</refentrytitle><manvolnum>5</manvolnum></citerefentry>
file system depending on the operating system. If fewer than 3
arguments are passed, <command>pkcheck</command> will attempt to
look up them up internally, but note that this may be racy.
</para>
<para>
If your program is a daemon with e.g. a custom Unix domain
socket, you should determine the <replaceable>uid</replaceable>
parameter via operating system mechanisms such as
<literal>PEERCRED</literal>.
</para>
</refsect1>
<refsect1 id="pkcheck-auth-agent"><title>AUTHENTICATION AGENT</title>
<para>
<command>pkcheck</command>, like any other polkit
application, will use the authentication agent registered for
the process in question. However, if no authentication agent is
available, then <command>pkcheck</command> can register its own
textual authentication agent if the option
<option>--enable-internal-agent</option> is passed.
</para>
</refsect1>
<refsect1 id="pkcheck-author"><title>AUTHOR</title>
<para>
Written by David Zeuthen <email>davidz@redhat.com</email> with
a lot of help from many others.
</para>
</refsect1>
<refsect1 id="pkcheck-bugs">
<title>BUGS</title>
<para>
Please send bug reports to either the distribution or the
polkit-devel mailing list,
see the link <ulink url="https://gitlab.freedesktop.org/polkit/polkit/-/issues/"/>
on how to subscribe.
</para>
</refsect1>
<refsect1 id="pkcheck-see-also">
<title>SEE ALSO</title>
<para>
<link linkend="polkit.8"><citerefentry><refentrytitle>polkit</refentrytitle><manvolnum>8</manvolnum></citerefentry></link>,
<link linkend="polkitd.8"><citerefentry><refentrytitle>polkitd</refentrytitle><manvolnum>8</manvolnum></citerefentry></link>,
<link linkend="pkaction.1"><citerefentry><refentrytitle>pkaction</refentrytitle><manvolnum>1</manvolnum></citerefentry></link>,
<link linkend="pkexec.1"><citerefentry><refentrytitle>pkexec</refentrytitle><manvolnum>1</manvolnum></citerefentry></link>,
<link linkend="pkttyagent.1"><citerefentry><refentrytitle>pkttyagent</refentrytitle><manvolnum>1</manvolnum></citerefentry></link>
</para>
</refsect1>
</refentry>
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