Add utility to allow extraction of embedded certificates in a form su…

…itable for later processing.

build.xml

@@ -379,4 +379,15 @@
 			x="extract_authorities.xsl"/>
 	</target>
 
+	<!--
+		Extract embedded certificates
+	-->
+	<target name="extract.embedded" depends="gen.uk">
+		<echo>Extracting embedded certificates</echo>
+		<XALAN
+			i="ukfederation-metadata-unsigned.xml"
+			o="embedded.pem"
+			x="extract_embedded.xsl"/>
+	</target>
+
 </project>

build/extract_embedded.xsl

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+	extract_embedded.xsl
+	
+	XSL stylesheet that takes a SAML 2.0 metadata file and extracts
+	all embedded certificates on entities in the form of a series of
+	PEM certificate blocks.
+	
+	A descriptive comment is added to indicate the entity in question and
+	the KeyName used (if any) so that later processing can distinguish.
+	
+	Author: Ian A. Young <ian@iay.org.uk>
+
+-->
+<xsl:stylesheet version="1.0"
+	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+	xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
+	xmlns:shibmeta="urn:mace:shibboleth:metadata:1.0"
+	xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:wayf="http://sdss.ac.uk/2006/06/WAYF"
+	xmlns:str="http://exslt.org/strings"
+	exclude-result-prefixes="shibmeta md ds wayf str">
+
+	<!-- Output is plain text -->
+	<xsl:output method="text"/>
+
+	<xsl:template match="//md:EntityDescriptor//md:KeyDescriptor[.//ds:X509Certificate]">
+		<xsl:text>Entity: </xsl:text>
+		<xsl:value-of select="ancestor::md:EntityDescriptor/@entityID"/>
+		<xsl:text> KeyName: </xsl:text>
+		<xsl:choose>
+			<xsl:when test=".//ds:KeyName">
+				<xsl:value-of select=".//ds:KeyName"/>
+			</xsl:when>
+			<xsl:otherwise>
+				<xsl:text>(none)</xsl:text>
+			</xsl:otherwise>
+		</xsl:choose>
+		<xsl:text>&#x0a;</xsl:text>
+		<xsl:text>-----BEGIN CERTIFICATE-----&#x0a;</xsl:text>
+		<xsl:apply-templates select="str:tokenize(.//ds:X509Certificate)"/>
+		<xsl:text>-----END CERTIFICATE-----&#x0a;</xsl:text>
+	</xsl:template>
+
+	<xsl:template match="token">
+		<xsl:value-of select="."/>
+		<xsl:text>&#x0a;</xsl:text>
+	</xsl:template>
+
+	<xsl:template match="text()">
+		<!-- do nothing -->
+	</xsl:template>
+</xsl:stylesheet>