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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.saml2.profile.impl;
import java.util.Collections;
import java.util.List;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.opensaml.profile.action.AbstractProfileAction;
import org.opensaml.profile.action.ActionSupport;
import org.opensaml.profile.action.EventIds;
import org.opensaml.profile.context.ProfileRequestContext;
import org.opensaml.profile.context.navigate.InboundMessageContextLookup;
import net.shibboleth.utilities.java.support.annotation.constraint.NonnullAfterInit;
import net.shibboleth.utilities.java.support.annotation.constraint.NonnullElements;
import net.shibboleth.utilities.java.support.component.ComponentInitializationException;
import net.shibboleth.utilities.java.support.component.ComponentSupport;
import net.shibboleth.utilities.java.support.logic.Constraint;
import net.shibboleth.utilities.java.support.security.IdentifierGenerationStrategy;
import net.shibboleth.utilities.java.support.security.SecureRandomIdentifierGenerationStrategy;
import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
import org.opensaml.messaging.context.navigate.MessageLookup;
import org.opensaml.saml.common.SAMLException;
import org.opensaml.saml.common.SAMLObject;
import org.opensaml.saml.common.SAMLObjectBuilder;
import org.opensaml.saml.common.profile.SAMLEventIds;
import org.opensaml.saml.common.profile.logic.DefaultNameIDPolicyPredicate;
import org.opensaml.saml.common.profile.logic.MetadataNameIdentifierFormatStrategy;
import org.opensaml.saml.saml2.core.Assertion;
import org.opensaml.saml.saml2.core.AuthnRequest;
import org.opensaml.saml.saml2.core.Issuer;
import org.opensaml.saml.saml2.core.NameID;
import org.opensaml.saml.saml2.core.NameIDPolicy;
import org.opensaml.saml.saml2.core.RequestAbstractType;
import org.opensaml.saml.saml2.core.Response;
import org.opensaml.saml.saml2.core.Subject;
import org.opensaml.saml.saml2.profile.SAML2ActionSupport;
import org.opensaml.saml.saml2.profile.SAML2NameIDGenerator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Function;
import com.google.common.base.Functions;
import com.google.common.base.Predicate;
import com.google.common.base.Strings;
/**
* Action that builds a {@link NameID} and adds it to the {@link Subject} of all the assertions
* found in a {@link Response}. The message to update is returned by a lookup strategy, by default
* the message returned by {@link ProfileRequestContext#getOutboundMessageContext()}.
*
* If no {@link Response} exists, then an {@link Assertion} directly in the outbound message context will
* be used or created by the default lookup strategy.
*
* If no {@link Subject} exists in the assertions found, it will be cretaed.
*
* The source of the {@link NameID} is one of a set of candidate {@link SAML2NameIDGenerator}
* plugins injected into the action. The plugin(s) to attempt to use are derived from the Format value,
* which is established by a lookup strategy.
*
* In addition, the generation process is influenced by the requested {@link NameIDPolicy}, which
* is evaluated using a pluggable predicate.
*
* @event {@link EventIds#PROCEED_EVENT_ID}
* @event {@link EventIds#INVALID_PROFILE_CTX}
* @event {@link SAMLEventIds#INVALID_NAMEID_POLICY}
*/
public class AddNameIDToSubjects extends AbstractProfileAction {
/** Class logger. */
@Nonnull private final Logger log = LoggerFactory.getLogger(AddNameIDToSubjects.class);
/** Builder for Subject objects. */
@Nonnull private SAMLObjectBuilder subjectBuilder;
/** Builder for NameID objects. */
@Nonnull private SAMLObjectBuilder nameIdBuilder;
/** Flag controlling whether to overwrite an existing NameID. */
private boolean overwriteExisting;
/** Strategy used to locate the {@link AuthnRequest} to operate on, if any. */
@Nonnull private Function requestLookupStrategy;
/** Strategy used to locate the {@link Response} to operate on. */
@Nonnull private Function> assertionsLookupStrategy;
/** Strategy used to locate the {@link IdentifierGenerationStrategy} to use. */
@Nonnull private Function idGeneratorLookupStrategy;
/** Strategy used to obtain the response issuer value. */
@Nullable private Function issuerLookupStrategy;
/** Predicate to validate {@link NameIDPolicy}. */
@Nonnull private Predicate nameIDPolicyPredicate;
/** Strategy used to determine the formats to try. */
@Nonnull private Function> formatLookupStrategy;
/** Generator to use. */
@NonnullAfterInit private SAML2NameIDGenerator generator;
/** Formats to try. */
@Nonnull @NonnullElements private List formats;
/** Format required by requested {@link NameIDPolicy}. */
@Nullable private String requiredFormat;
/** Request to examine. */
@Nullable private AuthnRequest request;
/** Response to modify. */
@Nullable private List assertions;
/** The generator to use. */
@Nullable private IdentifierGenerationStrategy idGenerator;
/** EntityID to populate into Issuer element. */
@Nullable private String issuerId;
/** Constructor.
*
* @throws ComponentInitializationException if an error occurs initializing default predicate.
*/
public AddNameIDToSubjects() throws ComponentInitializationException {
subjectBuilder = (SAMLObjectBuilder)
XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilderOrThrow(
Subject.DEFAULT_ELEMENT_NAME);
nameIdBuilder = (SAMLObjectBuilder)
XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilderOrThrow(
NameID.DEFAULT_ELEMENT_NAME);
overwriteExisting = true;
requestLookupStrategy =
Functions.compose(new MessageLookup<>(AuthnRequest.class), new InboundMessageContextLookup());
assertionsLookupStrategy = new AssertionStrategy();
// Default strategy is a 16-byte secure random source.
idGeneratorLookupStrategy = new Function() {
public IdentifierGenerationStrategy apply(ProfileRequestContext input) {
return new SecureRandomIdentifierGenerationStrategy();
}
};
// Default predicate pulls SPNameQualifier from NameIDPolicy and does a direct match
// against issuer. Handles simple cases, overridden for complex ones.
nameIDPolicyPredicate = new DefaultNameIDPolicyPredicate();
((DefaultNameIDPolicyPredicate) nameIDPolicyPredicate).setRequesterIdLookupStrategy(
new RequesterIdFromIssuerFunction());
((DefaultNameIDPolicyPredicate) nameIDPolicyPredicate).setObjectLookupStrategy(
new NameIDPolicyLookupFunction());
((DefaultNameIDPolicyPredicate) nameIDPolicyPredicate).initialize();
formatLookupStrategy = new MetadataNameIdentifierFormatStrategy();
formats = Collections.emptyList();
}
/**
* Set whether to overwrite any existing {@link NameID} objects found.
*
* @param flag true iff the action should overwrite any existing objects
*/
public void setOverwriteExisting(final boolean flag) {
ComponentSupport.ifInitializedThrowUnmodifiabledComponentException(this);
overwriteExisting = flag;
}
/**
* Set the strategy used to locate the {@link AuthnRequest} to examine, if any.
*
* @param strategy strategy used to locate the {@link AuthnRequest}
*/
public void setRequestLookupStrategy(@Nonnull final Function strategy) {
ComponentSupport.ifInitializedThrowUnmodifiabledComponentException(this);
requestLookupStrategy = Constraint.isNotNull(strategy, "AuthnRequest lookup strategy cannot be null");
}
/**
* Set the strategy used to locate the {@link Assertion}s to operate on.
*
* @param strategy lookup strategy
*/
public void setAssertionsLookupStrategy(@Nonnull final Function> strategy) {
ComponentSupport.ifInitializedThrowUnmodifiabledComponentException(this);
assertionsLookupStrategy = Constraint.isNotNull(strategy, "Assertions lookup strategy cannot be null");
}
/**
* Set the strategy used to locate the {@link IdentifierGenerationStrategy} to use.
*
* @param strategy lookup strategy
*/
public void setIdentifierGeneratorLookupStrategy(
@Nonnull final Function strategy) {
ComponentSupport.ifInitializedThrowUnmodifiabledComponentException(this);
idGeneratorLookupStrategy =
Constraint.isNotNull(strategy, "IdentifierGenerationStrategy lookup strategy cannot be null");
}
/**
* Set the strategy used to locate the issuer value to use.
*
* @param strategy lookup strategy
*/
public void setIssuerLookupStrategy(@Nullable final Function strategy) {
ComponentSupport.ifInitializedThrowUnmodifiabledComponentException(this);
issuerLookupStrategy = strategy;
}
/**
* Set the predicate used to evaluate the {@link NameIDPolicy}.
*
* @param predicate predicate used to evaluate the {@link NameIDPolicy}
*/
public void setNameIDPolicyPredicate(@Nonnull final Predicate predicate) {
ComponentSupport.ifInitializedThrowUnmodifiabledComponentException(this);
nameIDPolicyPredicate = Constraint.isNotNull(predicate, "NameIDPolicy predicate cannot be null");
}
/**
* Set the strategy function to use to obtain the formats to try.
*
* @param strategy format lookup strategy
*/
public void setFormatLookupStrategy(@Nonnull final Function> strategy) {
ComponentSupport.ifInitializedThrowUnmodifiabledComponentException(this);
formatLookupStrategy = Constraint.isNotNull(strategy, "Format lookup strategy cannot be null");
}
/**
* Set the generator to use.
*
* @param theGenerator the generator to use
*/
public void setNameIDGenerator(@Nullable final SAML2NameIDGenerator theGenerator) {
ComponentSupport.ifInitializedThrowUnmodifiabledComponentException(this);
generator = Constraint.isNotNull(theGenerator, "SAML2NameIDGenerator cannot be null");
}
/** {@inheritDoc} */
@Override
protected void doInitialize() throws ComponentInitializationException {
super.doInitialize();
if (generator == null) {
throw new ComponentInitializationException("SAML2NameIDGenerator cannot be null");
}
}
/** {@inheritDoc} */
@Override
protected boolean doPreExecute(@Nonnull final ProfileRequestContext profileRequestContext) {
if (!super.doPreExecute(profileRequestContext)) {
return false;
}
log.debug("{} Attempting to add NameID to outgoing Assertion Subjects", getLogPrefix());
idGenerator = idGeneratorLookupStrategy.apply(profileRequestContext);
if (idGenerator == null) {
log.debug("{} No identifier generation strategy", getLogPrefix());
ActionSupport.buildEvent(profileRequestContext, EventIds.INVALID_PROFILE_CTX);
return false;
}
if (issuerLookupStrategy != null) {
issuerId = issuerLookupStrategy.apply(profileRequestContext);
}
assertions = assertionsLookupStrategy.apply(profileRequestContext);
if (assertions == null || assertions.isEmpty()) {
log.debug("{} No assertions returned, nothing to do", getLogPrefix());
return false;
}
if (!nameIDPolicyPredicate.apply(profileRequestContext)) {
log.debug("{} NameIDPolicy was unacceptable", getLogPrefix());
ActionSupport.buildEvent(profileRequestContext, SAMLEventIds.INVALID_NAMEID_POLICY);
return false;
}
request = requestLookupStrategy.apply(profileRequestContext);
requiredFormat = getRequiredFormat(profileRequestContext);
if (requiredFormat != null) {
formats = Collections.singletonList(requiredFormat);
log.debug("{} Request specified NameID format: {}", getLogPrefix(), requiredFormat);
} else {
formats = formatLookupStrategy.apply(profileRequestContext);
if (formats == null || formats.isEmpty()) {
log.debug("{} No candidate NameID formats, nothing to do", getLogPrefix());
return false;
} else {
log.debug("{} Candidate NameID formats: {}", getLogPrefix(), formats);
}
}
return true;
}
/** {@inheritDoc} */
@Override
protected void doExecute(@Nonnull final ProfileRequestContext profileRequestContext) {
final NameID nameId = generateNameID(profileRequestContext);
if (nameId == null) {
if (requiredFormat != null) {
log.warn("{} Request specified use of an unsupportable identifier format: {}", getLogPrefix(),
requiredFormat);
ActionSupport.buildEvent(profileRequestContext, SAMLEventIds.INVALID_NAMEID_POLICY);
} else {
log.debug("{} Unable to generate a NameID, leaving empty", getLogPrefix());
}
return;
}
int count = 0;
for (final Assertion assertion : assertions) {
final Subject subject = getAssertionSubject(assertion);
final NameID existing = subject.getNameID();
if (existing == null || overwriteExisting) {
subject.setNameID(count > 0 ? cloneNameID(nameId) : nameId);
}
count ++;
}
if (count > 0) {
log.debug("{} Added NameID to {} assertion subject(s)", getLogPrefix(), count);
}
}
/**
* Extract a format required by the inbound request, if present.
*
* @param profileRequestContext current profile request context
*
* @return a format dictated by the request, or null
*/
@Nullable private String getRequiredFormat(@Nonnull final ProfileRequestContext profileRequestContext) {
if (request != null) {
final NameIDPolicy policy = request.getNameIDPolicy();
if (policy != null) {
final String format = policy.getFormat();
if (!Strings.isNullOrEmpty(format) && !NameID.UNSPECIFIED.equals(format)
&& !NameID.ENCRYPTED.equals(format)) {
return format;
}
}
}
return null;
}
/**
* Attempt to generate a {@link NameID} using each of the candidate Formats and plugins.
*
* @param profileRequestContext current profile request context
*
* @return a generated {@link NameID} or null
*/
@Nullable private NameID generateNameID(@Nonnull final ProfileRequestContext profileRequestContext) {
// See if we can generate one.
for (final String format : formats) {
log.debug("{} Trying to generate NameID with Format {}", getLogPrefix(), format);
try {
final NameID nameId = generator.generate(profileRequestContext, format);
if (nameId != null) {
log.debug("{} Successfully generated NameID with Format {}", getLogPrefix(), format);
return nameId;
}
} catch (final SAMLException e) {
log.error("{} Error while generating NameID", getLogPrefix(), e);
}
}
return null;
}
/**
* Get the subject to which the name identifier will be added.
*
* @param assertion the assertion being modified
*
* @return the assertion to which the name identifier will be added
*/
@Nonnull private Subject getAssertionSubject(@Nonnull final Assertion assertion) {
if (assertion.getSubject() != null) {
return assertion.getSubject();
}
final Subject subject = subjectBuilder.buildObject();
assertion.setSubject(subject);
return subject;
}
/**
* Create an efficient field-wise copy of a {@link NameID}.
*
* @param nameId the object to clone
*
* @return the copy
*/
@Nonnull private NameID cloneNameID(@Nonnull final NameID nameId) {
final NameID clone = nameIdBuilder.buildObject();
clone.setFormat(nameId.getFormat());
clone.setNameQualifier(nameId.getNameQualifier());
clone.setSPNameQualifier(nameId.getSPNameQualifier());
clone.setSPProvidedID(nameId.getSPProvidedID());
clone.setValue(nameId.getValue());
return clone;
}
/**
* Default strategy for obtaining assertions to modify.
*
* If the outbound context is empty, a null is returned. If the outbound
* message is already an assertion, it's returned. If the outbound message is a response,
* then its contents are returned. If the outbound message is anything else, null is returned.
*/
private class AssertionStrategy implements Function> {
/** {@inheritDoc} */
@Override
@Nullable public List apply(@Nullable final ProfileRequestContext input) {
if (input != null && input.getOutboundMessageContext() != null) {
final Object outboundMessage = input.getOutboundMessageContext().getMessage();
if (outboundMessage == null) {
final Assertion ret = SAML2ActionSupport.buildAssertion(AddNameIDToSubjects.this,
idGenerator, issuerId);
input.getOutboundMessageContext().setMessage(ret);
return Collections.singletonList(ret);
} else if (outboundMessage instanceof Assertion) {
return Collections.singletonList((Assertion) outboundMessage);
} else if (outboundMessage instanceof Response) {
return ((Response) outboundMessage).getAssertions();
}
}
return null;
}
}
/**
* Lookup function that returns the {@link NameIDPolicy} from an {@link AuthnRequest} message returned
* from a lookup function, by default the inbound message.
*/
public static class NameIDPolicyLookupFunction implements Function {
/** Strategy used to locate the {@link AuthnRequest} to operate on. */
@Nonnull private Function requestLookupStrategy;
/** Constructor. */
public NameIDPolicyLookupFunction() {
requestLookupStrategy =
Functions.compose(new MessageLookup<>(AuthnRequest.class), new InboundMessageContextLookup());
}
/**
* Set the strategy used to locate the {@link AuthnRequest} to examine.
*
* @param strategy strategy used to locate the {@link AuthnRequest}
*/
public void setRequestLookupStrategy(@Nonnull final Function strategy) {
requestLookupStrategy = Constraint.isNotNull(strategy, "AuthnRequest lookup strategy cannot be null");
}
/** {@inheritDoc} */
@Override
@Nullable public SAMLObject apply(@Nullable final ProfileRequestContext profileRequestContext) {
final AuthnRequest request = requestLookupStrategy.apply(profileRequestContext);
if (request != null) {
return request.getNameIDPolicy();
}
return null;
}
}
/**
* Lookup function that returns {@link org.opensaml.saml.saml2.core.RequestAbstractType#getIssuer()}
* from a request message returned from a lookup function, by default the inbound message.
*/
public static class RequesterIdFromIssuerFunction implements Function {
/** Strategy used to locate the {@link AuthnRequest} to operate on. */
@Nonnull private Function requestLookupStrategy;
/** Constructor. */
public RequesterIdFromIssuerFunction() {
requestLookupStrategy = Functions.compose(new MessageLookup<>(RequestAbstractType.class),
new InboundMessageContextLookup());
}
/**
* Set the strategy used to locate the {@link RequestAbstractType} to examine.
*
* @param strategy strategy used to locate the {@link RequestAbstractType}
*/
public void setRequestLookupStrategy(
@Nonnull final Function strategy) {
requestLookupStrategy = Constraint.isNotNull(strategy, "Request lookup strategy cannot be null");
}
/** {@inheritDoc} */
@Override
@Nullable public String apply(@Nullable final ProfileRequestContext profileRequestContext) {
final RequestAbstractType request = requestLookupStrategy.apply(profileRequestContext);
if (request != null && request.getIssuer() != null) {
final Issuer issuer = request.getIssuer();
if (issuer.getFormat() == null || NameID.ENTITY.equals(issuer.getFormat())) {
return issuer.getValue();
}
}
return null;
}
}
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