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/*
* Licensed to the University Corporation for Advanced Internet Development,
* Inc. (UCAID) under one or more contributor license agreements. See the
* NOTICE file distributed with this work for additional information regarding
* copyright ownership. The UCAID licenses this file to You under the Apache
* License, Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.opensaml.saml.common.profile.logic;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.regex.Pattern;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import net.shibboleth.utilities.java.support.annotation.constraint.NonnullElements;
import net.shibboleth.utilities.java.support.annotation.constraint.NotEmpty;
import net.shibboleth.utilities.java.support.annotation.constraint.NotLive;
import net.shibboleth.utilities.java.support.annotation.constraint.Unmodifiable;
import net.shibboleth.utilities.java.support.logic.Constraint;
import net.shibboleth.utilities.java.support.primitive.StringSupport;
import org.joda.time.DateTime;
import org.opensaml.core.xml.XMLObject;
import org.opensaml.saml.ext.saml2mdattr.EntityAttributes;
import org.opensaml.saml.saml2.core.Attribute;
import org.opensaml.saml.saml2.metadata.EntitiesDescriptor;
import org.opensaml.saml.saml2.metadata.EntityDescriptor;
import org.opensaml.saml.saml2.metadata.Extensions;
import org.opensaml.core.xml.schema.XSAny;
import org.opensaml.core.xml.schema.XSBase64Binary;
import org.opensaml.core.xml.schema.XSBoolean;
import org.opensaml.core.xml.schema.XSDateTime;
import org.opensaml.core.xml.schema.XSInteger;
import org.opensaml.core.xml.schema.XSString;
import org.opensaml.core.xml.schema.XSURI;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.collect.Collections2;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
/**
* Predicate to determine whether an {@link EntityDescriptor} or its parent groups contain an {@EntityAttribute}
* extension {@link Attribute} that matches the predicate's criteria.
*/
public class EntityAttributesPredicate implements Predicate {
/** Class logger. */
@Nonnull private final Logger log = LoggerFactory.getLogger(EntityAttributesPredicate.class);
/** Whether to trim the values in the metadata before comparison. */
private final boolean trimTags;
/** Whether all the candidates must match. */
private final boolean matchAll;
/** Candidates to check for. */
@Nonnull @NonnullElements private final Collection candidateSet;
/**
* Constructor.
*
* @param candidates the {@link Candidate} criteria to check for
*/
public EntityAttributesPredicate(@Nonnull @NonnullElements final Collection candidates) {
Constraint.isNotNull(candidates, "Attribute collection cannot be null");
candidateSet = new ArrayList<>(Collections2.filter(candidates, Predicates.notNull()));
trimTags = true;
matchAll = false;
}
/**
* Constructor.
*
* @param candidates the {@link Candidate} criteria to check for
* @param trim true iff the values found in the metadata should be trimmed before comparison
*/
public EntityAttributesPredicate(@Nonnull @NonnullElements final Collection candidates,
final boolean trim) {
Constraint.isNotNull(candidates, "Attribute collection cannot be null");
candidateSet = new ArrayList<>(Collections2.filter(candidates, Predicates.notNull()));
trimTags = trim;
matchAll = false;
}
/**
* Constructor.
*
* @param candidates the {@link Candidate} criteria to check for
* @param trim true iff the values found in the metadata should be trimmed before comparison
* @param all true iff all the criteria must match to be a successful test
*/
public EntityAttributesPredicate(@Nonnull @NonnullElements final Collection candidates,
final boolean trim, final boolean all) {
Constraint.isNotNull(candidates, "Attribute collection cannot be null");
candidateSet = new ArrayList<>(Collections2.filter(candidates, Predicates.notNull()));
trimTags = trim;
matchAll = all;
}
/**
* Get whether to trim tags for comparison.
*
* @return true iff tags are to be trimmed for comparison
*/
public boolean getTrimTags() {
return trimTags;
}
/**
* Get the candidate criteria.
*
* @return the candidate criteria
*/
@Nonnull @NonnullElements @Unmodifiable @NotLive public Collection getCandidates() {
return ImmutableList.copyOf(candidateSet);
}
// Checkstyle: CyclomaticComplexity OFF
/** {@inheritDoc} */
@Override
public boolean apply(@Nullable final EntityDescriptor input) {
if (input == null) {
return false;
}
Collection entityAttributes = null;
// Check for a tag match in the EntityAttributes extension of the entity and its parent(s).
Extensions exts = input.getExtensions();
if (exts != null) {
final List children = exts.getUnknownXMLObjects(EntityAttributes.DEFAULT_ELEMENT_NAME);
if (!children.isEmpty() && children.get(0) instanceof EntityAttributes) {
if (entityAttributes == null) {
entityAttributes = new ArrayList<>();
}
entityAttributes.addAll(((EntityAttributes) children.get(0)).getAttributes());
}
}
EntitiesDescriptor group = (EntitiesDescriptor) input.getParent();
while (group != null) {
exts = group.getExtensions();
if (exts != null) {
final List children = exts.getUnknownXMLObjects(EntityAttributes.DEFAULT_ELEMENT_NAME);
if (!children.isEmpty() && children.get(0) instanceof EntityAttributes) {
if (entityAttributes == null) {
entityAttributes = new ArrayList<>();
}
entityAttributes.addAll(((EntityAttributes) children.get(0)).getAttributes());
}
}
group = (EntitiesDescriptor) group.getParent();
}
if (entityAttributes == null || entityAttributes.isEmpty()) {
log.debug("no EntityAttributes extension found for {}", input.getEntityID());
return false;
}
// If we find a matching tag, we win. Each tag is treated in OR fashion.
final EntityAttributesMatcher matcher = new EntityAttributesMatcher(entityAttributes);
if (matchAll) {
return Iterables.all(candidateSet, matcher);
} else {
if (Iterables.tryFind(candidateSet, matcher).isPresent()) {
return true;
}
}
return false;
}
/**
* An object to encapsulate the set of criteria that must be satisfied by an {@link EntityAttributes}
* extension to satisfy the enclosing predicate.
*/
public static class Candidate {
/** Attribute Name. */
@Nonnull @NotEmpty private final String nam;
/** Attribute NameFormat. */
@Nullable private final String nameFormat;
/** Values that must match exactly. */
@Nonnull @NonnullElements private List values;
/** Regular expressions that must be satisfied. */
@Nonnull @NonnullElements private List regexps;
/**
* Constructor.
*
* @param name Attribute Name to match
*/
public Candidate(@Nonnull @NotEmpty final String name) {
nam = Constraint.isNotNull(StringSupport.trimOrNull(name), "Attribute Name cannot be null or empty");
nameFormat = null;
values = Collections.emptyList();
regexps = Collections.emptyList();
}
/**
* Constructor.
*
* @param name Attribute Name to match
* @param format Attribute NameFormat to match
*/
public Candidate(@Nonnull @NotEmpty final String name, @Nullable final String format) {
nam = Constraint.isNotNull(StringSupport.trimOrNull(name), "Attribute Name cannot be null or empty");
if (Attribute.UNSPECIFIED.equals(format)) {
nameFormat = null;
} else {
nameFormat = StringSupport.trimOrNull(format);
}
values = Collections.emptyList();
regexps = Collections.emptyList();
}
/**
* Get the Attribute Name to match.
*
* @return Attribute Name to match
*/
@Nonnull @NotEmpty public String getName() {
return nam;
}
/**
* Get the Attribute NameFormat to match.
*
* @return Attribute NameFormat to match
*/
@Nullable public String getNameFormat() {
return nameFormat;
}
/**
* Get the exact values to match.
*
* @return the exact values to match
*/
@Nonnull @NonnullElements @Unmodifiable @NotLive public List getValues() {
return ImmutableList.copyOf(values);
}
/**
* Set the exact values to match.
*
* @param vals the exact values to match
*/
public void setValues(@Nonnull @NonnullElements final Collection vals) {
Constraint.isNotNull(vals, "Values collection cannot be null");
values = new ArrayList<>(vals.size());
for (final String value : vals) {
if (value != null) {
values.add(value);
}
}
}
/**
* Get the regular expressions to match.
*
* @return the regular expressions to match.
*/
@Nonnull @NonnullElements @Unmodifiable @NotLive public List getRegexps() {
return ImmutableList.copyOf(regexps);
}
/**
* Set the regular expressions to match.
*
* @param exps the regular expressions to match
*/
public void setRegexps(@Nonnull @NonnullElements final Collection exps) {
Constraint.isNotNull(exps, "Regular expressions collection cannot be null");
regexps = new ArrayList<>(exps.size());
regexps.addAll(Collections2.filter(exps, Predicates.notNull()));
}
}
/**
* Determines whether an {@link Candidate} criterion is satisfied by the {@link Attribute}s
* in an {@link EntityAttributes} extension.
*/
private class EntityAttributesMatcher implements Predicate {
/** Class logger. */
@Nonnull private final Logger log = LoggerFactory.getLogger(EntityAttributesPredicate.class);
/** Population to evaluate for a match. */
private final Collection attributes;
/**
* Constructor.
*
* @param attrs population to evaluate for a match
*/
public EntityAttributesMatcher(@Nonnull @NonnullElements final Collection attrs) {
attributes = Constraint.isNotNull(attrs, "Extension attributes cannot be null");
}
/** {@inheritDoc} */
@Override
public boolean apply(@Nonnull final Candidate input) {
final List tagvals = input.values;
final List tagexps = input.regexps;
// Track whether we've found every match we need (possibly with arrays of 0 size).
final boolean[] valflags = new boolean[tagvals.size()];
final boolean[] expflags = new boolean[tagexps.size()];
// Check each attribute/tag in the populated set.
for (final Attribute a : attributes) {
// Compare Name and NameFormat for a matching tag.
if (a.getName() != null && a.getName().equals(input.getName())
&& (input.getNameFormat() == null || input.getNameFormat().equals(a.getNameFormat()))) {
// Check each tag value's simple content for a value match.
for (int tagindex = 0; tagindex < tagvals.size(); ++tagindex) {
final String tagvalstr = tagvals.get(tagindex);
final List cvals = a.getAttributeValues();
for (final XMLObject cval : cvals) {
final String cvalstr = xmlObjectToString(cval);
if (tagvalstr != null && cvalstr != null) {
if (tagvalstr.equals(cvalstr)) {
valflags[tagindex] = true;
break;
} else if (trimTags) {
if (tagvalstr.equals(cvalstr.trim())) {
valflags[tagindex] = true;
break;
}
}
}
}
}
// Check each tag regular expression for a match.
for (int tagindex = 0; tagindex < tagexps.size(); ++tagindex) {
final List cvals = a.getAttributeValues();
for (final XMLObject cval : cvals) {
final String cvalstr = xmlObjectToString(cval);
if (tagexps.get(tagindex) != null && cvalstr != null) {
if (tagexps.get(tagindex).matcher(cvalstr).matches()) {
expflags[tagindex] = true;
break;
}
}
}
}
}
}
for (final boolean flag : valflags) {
if (!flag) {
return false;
}
}
for (final boolean flag : expflags) {
if (!flag) {
return false;
}
}
return true;
}
/**
* Convert an XMLObject to a String if the type of recognized.
*
* @param object object to convert
* @return the converted value, or null
*/
@Nullable private String xmlObjectToString(@Nonnull final XMLObject object) {
String toMatch = null;
if (object instanceof XSString) {
toMatch = ((XSString) object).getValue();
} else if (object instanceof XSURI) {
toMatch = ((XSURI) object).getValue();
} else if (object instanceof XSBoolean) {
toMatch = ((XSBoolean) object).getValue().getValue() ? "1" : "0";
} else if (object instanceof XSInteger) {
toMatch = ((XSInteger) object).getValue().toString();
} else if (object instanceof XSDateTime) {
final DateTime dt = ((XSDateTime) object).getValue();
if (dt != null) {
toMatch = ((XSDateTime) object).getDateTimeFormatter().print(dt);
}
} else if (object instanceof XSBase64Binary) {
toMatch = ((XSBase64Binary) object).getValue();
} else if (object instanceof XSAny) {
final XSAny wc = (XSAny) object;
if (wc.getUnknownAttributes().isEmpty() && wc.getUnknownXMLObjects().isEmpty()) {
toMatch = wc.getTextContent();
}
}
if (toMatch != null) {
return toMatch;
}
log.warn("Unrecognized XMLObject type ({}), unable to convert to a string for comparison",
object.getClass().getName());
return null;
}
}
// Checkstyle: CyclomaticComplexity OFF
}
