PolicyKit/doc/spec Makefile.am, NONE, 1.1 polkit-arch.dia, NONE, 1.1 polkit-arch.png, NONE, 1.1 polkit-spec.html, NONE, 1.1 polkit-spec.xml.in, NONE, 1.1

Tue Mar 28 18:18:58 PST 2006

Update of /cvs/hal/PolicyKit/doc/spec
In directory kemper:/tmp/cvs-serv15001

Added Files:
	Makefile.am polkit-arch.dia polkit-arch.png polkit-spec.html 
	polkit-spec.xml.in 
Log Message:
initial commit

--- NEW FILE: Makefile.am ---


FIGURE_FILES =                        	\
	polkit-arch.png

if DOCBOOK_DOCS_ENABLED

htmldocdir = $(DOCDIR)/spec
htmldoc_DATA = polkit-spec.html $(FIGURE_FILES)

polkit-spec.html : polkit-spec.xml $(FIGURE_FILES)
	$(DOCBOOK) --nochunks polkit-spec.xml -o .

clean-local:
	rm -f *~
	rm -f polkit-spec.html polkit-spec.xml


endif # DOCBOOK_DOCS_ENABLED

EXTRA_DIST = polkit-spec.html    \
	     polkit-spec.xml.in  \
	     polkit-arch.dia	 \
	     $(FIGURE_FILES)

--- NEW FILE: polkit-arch.dia ---
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--- NEW FILE: polkit-spec.html ---
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>PolicyKit 0.1 Specification</TITLE
><META
NAME="GENERATOR"
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><BODY
CLASS="book"
BGCOLOR="#FFFFFF"
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><DIV
CLASS="BOOK"
><A
NAME="index"
></A
><DIV
CLASS="TITLEPAGE"
><H1
CLASS="title"
><A
NAME="AEN2"
>PolicyKit 0.1 Specification</A
></H1
><H3
CLASS="author"
><A
NAME="AEN7"
></A
>David Zeuthen</H3
><DIV
CLASS="affiliation"
><DIV
CLASS="address"
><P
CLASS="address"
><br>
	&nbsp;&nbsp;&nbsp;&nbsp;<CODE
CLASS="email"
>&#60;<A
HREF="mailto:david at fubar.dk"
>david at fubar.dk</A
>&#62;</CODE
><br>
	&nbsp;&nbsp;</P
></DIV
></DIV
><SPAN
CLASS="releaseinfo"
>Version 0.1<BR></SPAN
><HR></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="#introduction"
>Introduction</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN15"
>About</A
></DT
></DL
></DD
><DT
><A
HREF="#privileges"
>Theory of operation</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN20"
>Privileges</A
></DT
><DT
><A
HREF="#AEN26"
>Architecture</A
></DT
><DT
><A
HREF="#AEN37"
>Example</A
></DT
></DL
></DD
></DL
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="introduction"
></A
>Introduction</H1
><DIV
CLASS="sect1"
><H2
CLASS="sect1"
><A
NAME="AEN15"
>About</A
></H2
><P
>&#13;	PolicyKit is a system for enabling unprivileged desktop
	applications to invoke privileged methods on system-wide
	components in a controlled manner.
      </P
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="privileges"
></A
>Theory of operation</H1
><DIV
CLASS="sect1"
><H2
CLASS="sect1"
><A
NAME="AEN20"
>Privileges</A
></H2
><P
>&#13;	One major concept of the PolicyKit system is the notion of
	privileges; a <I
CLASS="emphasis"
>PolicyKit privilege</I
>
	(referred to simply as
	<I
CLASS="emphasis"
>privilege</I
> in the following) is something
	that a given user may or may not possess. The thinking behind
	PolicyKit is that privileged system level components offer
	functionality to unprivileged desktop applications as D-BUS
	method calls through the system message bus. In order to have
	a flexible security policy defining the set of users that are
	allowed to invoke a method, the system level component defines
	a set of
	<I
CLASS="emphasis"
>privileges</I
>. 
      </P
></DIV
><DIV
CLASS="sect1"
><HR><H2
CLASS="sect1"
><A
NAME="AEN26"
>Architecture</A
></H2
><P
>&#13;	The PolicyKit system is basically client/server and is
	implemented as the
	system-wide <TT
CLASS="literal"
>org.freedesktop.PolicyKit</TT
> D-BUS
	service. This D-BUS service serves two purposes
      </P
><P
></P
><UL
><LI
><P
>&#13;	    System-level components may used D-BUS methods on this
	    service to determine if a given caller of their methods
	    are privileged.
          </P
></LI
><LI
><P
>&#13;	    Desktop level applications may initiate a dialogue with
	    this service to (temporarily) obtain a privilege through
	    authorization.
          </P
></LI
></UL
><P
>&#13;	In addition, the PolicyKit system includes client side
	libraries and command-line utilities wrapping the D-BUS API of
	the <TT
CLASS="literal"
>org.freedesktop.PolicyKit</TT
> service.
      </P
></DIV
><DIV
CLASS="sect1"
><HR><H2
CLASS="sect1"
><A
NAME="AEN37"
>Example</A
></H2
><P
>&#13;	As an example, HAL exports the method <TT
CLASS="literal"
>Mount</TT
>
	on the
	<TT
CLASS="literal"
>org.freedesktop.Hal.Device.Volume</TT
> interface
	for each hal device object of
	capability <I
CLASS="emphasis"
>volume</I
>. HAL defines a number
	of privileges for mounting
	including <I
CLASS="emphasis"
>hal-storage-fixed-mount</I
>
	and <I
CLASS="emphasis"
>hal-storage-removable-mount</I
>. Depending
	on the whether the volume stems from a fixed hard disk or a
	hotpluggable/removable drive, HAL requires the calling user to
	possess either
	the <I
CLASS="emphasis"
>hal-storage-fixed-mount</I
>
	or <I
CLASS="emphasis"
>hal-storage-removable-mount</I
> privilege
	in order to carry out the <TT
CLASS="literal"
>Mount</TT
> method. 
      </P
><P
>&#13;	Upon a user invoking the <TT
CLASS="literal"
>Mount</TT
> method, HAL
	simply asks the <TT
CLASS="literal"
>org.freedesktop.PolicyKit</TT
>
	D-BUS service if the calling user posses this privilege and if
	this is not the case the <TT
CLASS="literal"
>Mount</TT
> method
	throws
	the <TT
CLASS="literal"
>org.freedesktop.Hal.Device.PermissionDeniedByPolicy</TT
>
	exception. Notably, this exception will tell the caller what
	privilege the calling user needs to possess,
	e.g. either <I
CLASS="emphasis"
>hal-storage-fixed-mount</I
>
	or <I
CLASS="emphasis"
>hal-storage-removable-mount</I
>.
      </P
><P
>&#13;	Should the <TT
CLASS="literal"
>Mount</TT
> method fail with the
	exception <TT
CLASS="literal"
>PermissionDeniedByPolicy</TT
> the
	caller now knows what privilege is required. The caller can
	now initiate a dialogue with the <TT
CLASS="literal"
>PolicyKit</TT
>
	service to obtain this privilege. This conversation is
	basically equivalent to a PAM authentication; in fact the 
	<TT
CLASS="literal"
>PolicyKit</TT
> service uses PAM under the hood
	and wraps it in D-BUS calls. For details (like what user to
	authenticate as) see XXX. When the caller obtains the
	privilege (after successful authentication) he can now
	invoke <TT
CLASS="literal"
>Mount</TT
> and after this succeeds he may
	tell the <TT
CLASS="literal"
>PolicyKit</TT
> service to release the
	privilege for the user as it is no longer needed.
      </P
><P
>&#13;	Hence, <TT
CLASS="literal"
>PolicyKit</TT
> has the notion of
	both <I
CLASS="emphasis"
>permament</I
>
	and <I
CLASS="emphasis"
>temporary</I
> privileges. The latter may
	even be restricted such that only callers from the D-BUS
	connection (remember, D-BUS connections has unique names)
	obtaining the privilege may use the obtained privilege.
      </P
><P
>&#13;	<IMG
SRC="polkit-arch.png">
      </P
><P
>&#13;	The whole example is outlined in the diagram above.
      </P
></DIV
></DIV
></DIV
></BODY
></HTML
>
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<book id="index">
  <bookinfo>
    <title>PolicyKit 0.1 Specification</title>
    <releaseinfo>Version 0.1</releaseinfo>
    <date>March 28th, 2006</date> <!-- Update this manually -->
    <authorgroup>
      <author>
	<firstname>David</firstname>
	<surname>Zeuthen</surname>
	<affiliation>
	  <address>
	    <email>david at fubar.dk</email>
	  </address>
	</affiliation>
      </author>
    </authorgroup>
  </bookinfo>
  
  <chapter id="introduction">
    <title>Introduction</title>

    <sect1>
      <title>About</title>

      <para>
	PolicyKit is a system for enabling unprivileged desktop
	applications to invoke privileged methods on system-wide
	components in a controlled manner.
      </para>

    </sect1>
  </chapter>

  <chapter id="privileges">
    <title>Theory of operation</title>

    <sect1>
      <title>Privileges</title>

      <para>
	One major concept of the PolicyKit system is the notion of
	privileges; a <emphasis>PolicyKit privilege</emphasis>
	(referred to simply as
	<emphasis>privilege</emphasis> in the following) is something
	that a given user may or may not possess. The thinking behind
	PolicyKit is that privileged system level components offer
	functionality to unprivileged desktop applications as D-BUS
	method calls through the system message bus. In order to have
	a flexible security policy defining the set of users that are
	allowed to invoke a method, the system level component defines
	a set of
	<emphasis>privileges</emphasis>. 
      </para>

    </sect1>

    <sect1>
      <title>Architecture</title>

      <para>
	The PolicyKit system is basically client/server and is
	implemented as the
	system-wide <literal>org.freedesktop.PolicyKit</literal> D-BUS
	service. This D-BUS service serves two purposes
      </para>


      <itemizedlist>
        <listitem>
	  <para>
	    System-level components may used D-BUS methods on this
	    service to determine if a given caller of their methods
	    are privileged.
          </para>
	</listitem>

        <listitem>
	  <para>
	    Desktop level applications may initiate a dialogue with
	    this service to (temporarily) obtain a privilege through
	    authorization.
          </para>
	</listitem>
      </itemizedlist>

      <para>
	In addition, the PolicyKit system includes client side
	libraries and command-line utilities wrapping the D-BUS API of
	the <literal>org.freedesktop.PolicyKit</literal> service.
      </para>

    </sect1>

    <sect1>
      <title>Example</title>

      <para>
	As an example, HAL exports the method <literal>Mount</literal>
	on the
	<literal>org.freedesktop.Hal.Device.Volume</literal> interface
	for each hal device object of
	capability <emphasis>volume</emphasis>. HAL defines a number
	of privileges for mounting
	including <emphasis>hal-storage-fixed-mount</emphasis>
	and <emphasis>hal-storage-removable-mount</emphasis>. Depending
	on the whether the volume stems from a fixed hard disk or a
	hotpluggable/removable drive, HAL requires the calling user to
	possess either
	the <emphasis>hal-storage-fixed-mount</emphasis>
	or <emphasis>hal-storage-removable-mount</emphasis> privilege
	in order to carry out the <literal>Mount</literal> method. 
      </para>

      <para>
	Upon a user invoking the <literal>Mount</literal> method, HAL
	simply asks the <literal>org.freedesktop.PolicyKit</literal>
	D-BUS service if the calling user posses this privilege and if
	this is not the case the <literal>Mount</literal> method
	throws
	the <literal>org.freedesktop.Hal.Device.PermissionDeniedByPolicy</literal>
	exception. Notably, this exception will tell the caller what
	privilege the calling user needs to possess,
	e.g. either <emphasis>hal-storage-fixed-mount</emphasis>
	or <emphasis>hal-storage-removable-mount</emphasis>.
      </para>

      <para>
	Should the <literal>Mount</literal> method fail with the
	exception <literal>PermissionDeniedByPolicy</literal> the
	caller now knows what privilege is required. The caller can
	now initiate a dialogue with the <literal>PolicyKit</literal>
	service to obtain this privilege. This conversation is
	basically equivalent to a PAM authentication; in fact the 
	<literal>PolicyKit</literal> service uses PAM under the hood
	and wraps it in D-BUS calls. For details (like what user to
	authenticate as) see XXX. When the caller obtains the
	privilege (after successful authentication) he can now
	invoke <literal>Mount</literal> and after this succeeds he may
	tell the <literal>PolicyKit</literal> service to release the
	privilege for the user as it is no longer needed.
      </para>

      <para>
	Hence, <literal>PolicyKit</literal> has the notion of
	both <emphasis>permament</emphasis>
	and <emphasis>temporary</emphasis> privileges. The latter may
	even be restricted such that only callers from the D-BUS
	connection (remember, D-BUS connections has unique names)
	obtaining the privilege may use the obtained privilege.
      </para>

      <para>
	<inlinegraphic fileref="polkit-arch.png" format="PNG"/>
      </para>

      <para>
	The whole example is outlined in the diagram above.
      </para>

    </sect1>
  </chapter>
  
</book>