[Xend/ACM] Embed the policy schema in the python file

This patch embeds the ACM policy's schema in the python file where the
schema is being accessed for verifying the policy XML. This way also
programs that cannot access a protected directory where the schema may
be located in can use this class.

Signed-off-by: Stefan Berger <stefanb@us.ibm.com>

tools/python/xen/util/acmpolicy.py

@@ -49,8 +49,6 @@ ACM_SIMPLE_TYPE_ENFORCEMENT_POLICY = 2
 ACM_POLICY_UNDEFINED = 15
 
 
-ACM_SCHEMA_FILE = ACM_POLICIES_DIR + "security_policy.xsd"
-
 ACM_LABEL_UNLABELED = "__UNLABELED__"
 ACM_LABEL_UNLABELED_DISPLAY = "unlabeled"
 
@@ -118,6 +116,153 @@ DEFAULT_policy = \
 "  </SecurityLabelTemplate>\n" +\
 "</SecurityPolicyDefinition>\n"
 
+ACM_SCHEMA="""<?xml version="1.0" encoding="UTF-8"?>
+<!-- Author: Ray Valdez, Reiner Sailer {rvaldez,sailer}@us.ibm.com -->
+<!--         This file defines the schema, which is used to define -->
+<!--         the security policy and the security labels in Xen.    -->
+
+<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.ibm.com" xmlns="http://www.ibm.com" elementFormDefault="qualified">
+	<xsd:element name="SecurityPolicyDefinition">
+		<xsd:complexType>
+			<xsd:sequence>
+				<xsd:element ref="PolicyHeader" minOccurs="1" maxOccurs="1"></xsd:element>
+				<xsd:element ref="SimpleTypeEnforcement" minOccurs="0" maxOccurs="1"></xsd:element>
+				<xsd:element ref="ChineseWall" minOccurs="0" maxOccurs="1"></xsd:element>
+				<xsd:element ref="SecurityLabelTemplate" minOccurs="1" maxOccurs="1"></xsd:element>
+			</xsd:sequence>
+		</xsd:complexType>
+	</xsd:element>
+	<xsd:element name="PolicyHeader">
+		<xsd:complexType>
+			<xsd:sequence>
+				<xsd:element name="PolicyName" minOccurs="1" maxOccurs="1" type="xsd:string"></xsd:element>
+				<xsd:element name="PolicyUrl" minOccurs="0" maxOccurs="1" type="xsd:string"></xsd:element>
+				<xsd:element name="Reference" type="xsd:string" minOccurs="0" maxOccurs="1" />
+				<xsd:element name="Date" minOccurs="0" maxOccurs="1" type="xsd:string"></xsd:element>
+				<xsd:element name="NameSpaceUrl" minOccurs="0" maxOccurs="1" type="xsd:string"></xsd:element>
+				<xsd:element name="Version" minOccurs="1" maxOccurs="1" type="VersionFormat"/>
+				<xsd:element ref="FromPolicy" minOccurs="0" maxOccurs="1"/>
+			</xsd:sequence>
+		</xsd:complexType>
+	</xsd:element>
+	<xsd:element name="ChineseWall">
+		<xsd:complexType>
+			<xsd:sequence>
+				<xsd:element ref="ChineseWallTypes" minOccurs="1" maxOccurs="1" />
+				<xsd:element ref="ConflictSets" minOccurs="0" maxOccurs="1" />
+			</xsd:sequence>
+			<xsd:attribute name="priority" type="PolicyOrder" use="optional"></xsd:attribute>
+		</xsd:complexType>
+	</xsd:element>
+	<xsd:element name="SimpleTypeEnforcement">
+		<xsd:complexType>
+			<xsd:sequence>
+				<xsd:element ref="SimpleTypeEnforcementTypes" />
+			</xsd:sequence>
+			<xsd:attribute name="priority" type="PolicyOrder" use="optional"></xsd:attribute>
+		</xsd:complexType>
+	</xsd:element>
+	<xsd:element name="SecurityLabelTemplate">
+		<xsd:complexType>
+			<xsd:sequence>
+				<xsd:element name="SubjectLabels" minOccurs="0" maxOccurs="1">
+					<xsd:complexType>
+						<xsd:sequence>
+							<xsd:element ref="VirtualMachineLabel" minOccurs="1" maxOccurs="unbounded"></xsd:element>
+						</xsd:sequence>
+						<xsd:attribute name="bootstrap" type="xsd:string" use="required"></xsd:attribute>
+					</xsd:complexType>
+				</xsd:element>
+				<xsd:element name="ObjectLabels" minOccurs="0" maxOccurs="1">
+					<xsd:complexType>
+						<xsd:sequence>
+							<xsd:element ref="ResourceLabel" minOccurs="1" maxOccurs="unbounded"></xsd:element>
+						</xsd:sequence>
+					</xsd:complexType>
+				</xsd:element>
+			</xsd:sequence>
+		</xsd:complexType>
+	</xsd:element>
+	<xsd:element name="ChineseWallTypes">
+		<xsd:complexType>
+			<xsd:sequence>
+				<xsd:element maxOccurs="unbounded" minOccurs="1" ref="Type" />
+			</xsd:sequence>
+		</xsd:complexType>
+	</xsd:element>
+	<xsd:element name="ConflictSets">
+		<xsd:complexType>
+			<xsd:sequence>
+				<xsd:element maxOccurs="unbounded" minOccurs="1" ref="Conflict" />
+			</xsd:sequence>
+		</xsd:complexType>
+	</xsd:element>
+	<xsd:element name="SimpleTypeEnforcementTypes">
+		<xsd:complexType>
+			<xsd:sequence>
+				<xsd:element maxOccurs="unbounded" minOccurs="1" ref="Type" />
+			</xsd:sequence>
+		</xsd:complexType>
+	</xsd:element>
+	<xsd:element name="Conflict">
+		<xsd:complexType>
+			<xsd:sequence>
+				<xsd:element maxOccurs="unbounded" minOccurs="1" ref="Type" />
+			</xsd:sequence>
+			<xsd:attribute name="name" type="xsd:string" use="required"></xsd:attribute>
+		</xsd:complexType>
+	</xsd:element>
+	<xsd:element name="VirtualMachineLabel">
+		<xsd:complexType>
+			<xsd:sequence>
+				<xsd:element name="Name" type="NameWithFrom"></xsd:element>
+				<xsd:element ref="SimpleTypeEnforcementTypes" minOccurs="0" maxOccurs="unbounded" />
+				<xsd:element ref="ChineseWallTypes" minOccurs="0" maxOccurs="unbounded" />
+			</xsd:sequence>
+		</xsd:complexType>
+	</xsd:element>
+	<xsd:element name="ResourceLabel">
+		<xsd:complexType>
+			<xsd:sequence>
+				<xsd:element name="Name" type="NameWithFrom"></xsd:element>
+				<xsd:element name="SimpleTypeEnforcementTypes" type="SingleSimpleTypeEnforcementType" />
+			</xsd:sequence>
+		</xsd:complexType>
+	</xsd:element>
+	<xsd:element name="Name" type="xsd:string" />
+	<xsd:element name="Type" type="xsd:string" />
+	<xsd:simpleType name="PolicyOrder">
+		<xsd:restriction base="xsd:string">
+			<xsd:enumeration value="PrimaryPolicyComponent"></xsd:enumeration>
+		</xsd:restriction>
+	</xsd:simpleType>
+	<xsd:element name="FromPolicy">
+		<xsd:complexType>
+			<xsd:sequence>
+				<xsd:element name="PolicyName" minOccurs="1" maxOccurs="1" type="xsd:string"/>
+				<xsd:element name="Version" minOccurs="1" maxOccurs="1" type="VersionFormat"/>
+			</xsd:sequence>
+		</xsd:complexType>
+	</xsd:element>
+	<xsd:simpleType name="VersionFormat">
+		<xsd:restriction base="xsd:string">
+			<xsd:pattern value="[0-9]{1,8}.[0-9]{1,8}"></xsd:pattern>
+		</xsd:restriction>
+	</xsd:simpleType>
+	<xsd:complexType name="NameWithFrom">
+		<xsd:simpleContent>
+			<xsd:extension base="xsd:string">
+				<xsd:attribute name="from" type="xsd:string" use="optional"></xsd:attribute>
+			</xsd:extension>
+		</xsd:simpleContent>
+	</xsd:complexType>
+	<xsd:complexType name="SingleSimpleTypeEnforcementType">
+		<xsd:sequence>
+			<xsd:element maxOccurs="1" minOccurs="1" ref="Type" />
+		</xsd:sequence>
+	</xsd:complexType>
+</xsd:schema>"""
+
 
 def get_DEFAULT_policy(dom0label=""):
     fromnode = ""
@@ -133,18 +278,7 @@ def initialize():
 
     instdir = security.install_policy_dir_prefix
     DEF_policy_file = "DEFAULT-security_policy.xml"
-    xsd_file = "security_policy.xsd"
 
-    files = [ xsd_file ]
-
-    for file in files:
-        if not os.path.isfile(policiesdir + "/" + file ):
-            try:
-                shutil.copyfile(instdir + "/" + file,
-                                policiesdir + "/" + file)
-            except Exception, e:
-                log.info("could not copy '%s': %s" %
-                         (file, str(e)))
     #Install default policy.
     f = open(policiesdir + "/" + DEF_policy_file, 'w')
     if f:
@@ -219,7 +353,8 @@ class ACMPolicy(XSPolicy):
             log.warn("Libxml2 python-wrapper is not installed on the system.")
             return xsconstants.XSERR_SUCCESS
         try:
-            parserctxt = libxml2.schemaNewParserCtxt(ACM_SCHEMA_FILE)
+            parserctxt = libxml2.schemaNewMemParserCtxt(ACM_SCHEMA,
+                                                        len(ACM_SCHEMA))
             schemaparser = parserctxt.schemaParse()
             valid = schemaparser.schemaNewValidCtxt()
             doc = libxml2.parseDoc(self.toxml())