2 * Copyright 2001-2009 Internet2
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 * SignatureMetadataFilter.cpp
20 * Filters out unsigned or mis-signed elements.
24 #include "saml2/metadata/Metadata.h"
25 #include "saml2/metadata/MetadataFilter.h"
26 #include "signature/SignatureProfileValidator.h"
28 #include <xmltooling/logging.h>
29 #include <xmltooling/XMLToolingConfig.h>
30 #include <xmltooling/security/Credential.h>
31 #include <xmltooling/security/CredentialCriteria.h>
32 #include <xmltooling/security/CredentialResolver.h>
33 #include <xmltooling/security/SignatureTrustEngine.h>
34 #include <xmltooling/signature/SignatureValidator.h>
35 #include <xmltooling/util/NDC.h>
37 using namespace opensaml::saml2md;
38 using namespace opensaml;
39 using namespace xmlsignature;
40 using namespace xmltooling::logging;
41 using namespace xmltooling;
47 class SAML_DLLLOCAL DummyCredentialResolver : public CredentialResolver
50 DummyCredentialResolver() {}
51 ~DummyCredentialResolver() {}
53 Lockable* lock() {return this;}
56 const Credential* resolve(const CredentialCriteria* criteria=NULL) const {return NULL;}
57 vector<const Credential*>::size_type resolve(
58 vector<const Credential*>& results, const CredentialCriteria* criteria=NULL
62 class SAML_DLLLOCAL SignatureMetadataFilter : public MetadataFilter
65 SignatureMetadataFilter(const DOMElement* e);
66 ~SignatureMetadataFilter() {
67 delete m_credResolver;
71 const char* getId() const { return SIGNATURE_METADATA_FILTER; }
72 void doFilter(XMLObject& xmlObject) const;
75 void doFilter(EntitiesDescriptor& entities, bool rootObject=false) const;
76 void doFilter(EntityDescriptor& entity, bool rootObject=false) const;
77 void verifySignature(Signature* sig, const XMLCh* peerName) const;
79 bool m_verifyRoles,m_verifyName;
80 CredentialResolver* m_credResolver;
81 SignatureTrustEngine* m_trust;
82 SignatureProfileValidator m_profileValidator;
86 MetadataFilter* SAML_DLLLOCAL SignatureMetadataFilterFactory(const DOMElement* const & e)
88 return new SignatureMetadataFilter(e);
94 static const XMLCh _TrustEngine[] = UNICODE_LITERAL_11(T,r,u,s,t,E,n,g,i,n,e);
95 static const XMLCh _CredentialResolver[] = UNICODE_LITERAL_18(C,r,e,d,e,n,t,i,a,l,R,e,s,o,l,v,e,r);
96 static const XMLCh type[] = UNICODE_LITERAL_4(t,y,p,e);
97 static const XMLCh certificate[] = UNICODE_LITERAL_11(c,e,r,t,i,f,i,c,a,t,e);
98 static const XMLCh Certificate[] = UNICODE_LITERAL_11(C,e,r,t,i,f,i,c,a,t,e);
99 static const XMLCh Path[] = UNICODE_LITERAL_4(P,a,t,h);
100 static const XMLCh verifyRoles[] = UNICODE_LITERAL_11(v,e,r,i,f,y,R,o,l,e,s);
101 static const XMLCh verifyName[] = UNICODE_LITERAL_10(v,e,r,i,f,y,N,a,m,e);
103 SignatureMetadataFilter::SignatureMetadataFilter(const DOMElement* e)
104 : m_verifyRoles(false), m_verifyName(true), m_credResolver(NULL), m_trust(NULL), m_log(Category::getInstance(SAML_LOGCAT".MetadataFilter.Signature"))
106 const XMLCh* flag = e ? e->getAttributeNS(NULL,verifyRoles) : NULL;
107 m_verifyRoles = (flag && (*flag == chLatin_t || *flag == chDigit_1));
109 flag = e ? e->getAttributeNS(NULL,verifyName) : NULL;
110 m_verifyName = !(flag && (*flag == chLatin_f || *flag == chDigit_0));
112 if (e && e->hasAttributeNS(NULL,certificate)) {
113 // Use a file-based credential resolver rooted here.
114 m_credResolver = XMLToolingConfig::getConfig().CredentialResolverManager.newPlugin(FILESYSTEM_CREDENTIAL_RESOLVER,e);
118 DOMElement* sub = e ? XMLHelper::getFirstChildElement(e, _CredentialResolver) : NULL;
119 auto_ptr_char t(sub ? sub->getAttributeNS(NULL,type) : NULL);
121 m_credResolver = XMLToolingConfig::getConfig().CredentialResolverManager.newPlugin(t.get(),sub);
125 sub = e ? XMLHelper::getFirstChildElement(e, _TrustEngine) : NULL;
126 auto_ptr_char t2(sub ? sub->getAttributeNS(NULL,type) : NULL);
128 TrustEngine* trust = XMLToolingConfig::getConfig().TrustEngineManager.newPlugin(t2.get(),sub);
129 if (!(m_trust = dynamic_cast<SignatureTrustEngine*>(trust))) {
131 throw MetadataFilterException("TrustEngine-based SignatureMetadataFilter requires a SignatureTrustEngine plugin.");
136 throw MetadataFilterException("SignatureMetadataFilter configuration requires <CredentialResolver> or <TrustEngine> element.");
139 void SignatureMetadataFilter::doFilter(XMLObject& xmlObject) const
146 EntitiesDescriptor& entities = dynamic_cast<EntitiesDescriptor&>(xmlObject);
147 doFilter(entities, true);
152 catch (exception& ex) {
153 m_log.warn("filtering out group at root of instance after failed signature check: %s", ex.what());
154 throw MetadataFilterException("SignatureMetadataFilter unable to verify signature at root of metadata instance.");
158 EntityDescriptor& entity = dynamic_cast<EntityDescriptor&>(xmlObject);
159 doFilter(entity, true);
164 catch (exception& ex) {
165 m_log.warn("filtering out entity at root of instance after failed signature check: %s", ex.what());
166 throw MetadataFilterException("SignatureMetadataFilter unable to verify signature at root of metadata instance.");
169 throw MetadataFilterException("SignatureMetadataFilter was given an improper metadata instance to filter.");
172 void SignatureMetadataFilter::doFilter(EntitiesDescriptor& entities, bool rootObject) const
174 Signature* sig = entities.getSignature();
175 if (!sig && rootObject)
176 throw MetadataFilterException("Root metadata element was unsigned.");
177 verifySignature(sig, entities.getName());
179 VectorOf(EntityDescriptor) v=entities.getEntityDescriptors();
180 for (VectorOf(EntityDescriptor)::size_type i=0; i<v.size(); ) {
185 catch (exception& e) {
186 auto_ptr_char id(v[i]->getEntityID());
187 m_log.warn("filtering out entity (%s) after failed signature check: %s", id.get(), e.what());
188 v.erase(v.begin() + i);
192 VectorOf(EntitiesDescriptor) w=entities.getEntitiesDescriptors();
193 for (VectorOf(EntitiesDescriptor)::size_type j=0; j<w.size(); ) {
195 doFilter(*w[j], false);
198 catch (exception& e) {
199 auto_ptr_char name(w[j]->getName());
200 m_log.warn("filtering out group (%s) after failed signature check: %s", name.get(), e.what());
201 w.erase(w.begin() + j);
206 void SignatureMetadataFilter::doFilter(EntityDescriptor& entity, bool rootObject) const
208 Signature* sig = entity.getSignature();
209 if (!sig && rootObject)
210 throw MetadataFilterException("Root metadata element was unsigned.");
211 verifySignature(sig, entity.getEntityID());
216 VectorOf(IDPSSODescriptor) idp=entity.getIDPSSODescriptors();
217 for (VectorOf(IDPSSODescriptor)::size_type i=0; i<idp.size(); ) {
219 verifySignature(idp[i]->getSignature(), entity.getEntityID());
222 catch (exception& e) {
223 auto_ptr_char id(entity.getEntityID());
225 "filtering out IDPSSODescriptor for entity (%s) after failed signature check: %s", id.get(), e.what()
227 idp.erase(idp.begin() + i);
231 VectorOf(SPSSODescriptor) sp=entity.getSPSSODescriptors();
232 for (VectorOf(SPSSODescriptor)::size_type i=0; i<sp.size(); ) {
234 verifySignature(sp[i]->getSignature(), entity.getEntityID());
237 catch (exception& e) {
238 auto_ptr_char id(entity.getEntityID());
240 "filtering out SPSSODescriptor for entity (%s) after failed signature check: %s", id.get(), e.what()
242 sp.erase(sp.begin() + i);
246 VectorOf(AuthnAuthorityDescriptor) authn=entity.getAuthnAuthorityDescriptors();
247 for (VectorOf(AuthnAuthorityDescriptor)::size_type i=0; i<authn.size(); ) {
249 verifySignature(authn[i]->getSignature(), entity.getEntityID());
252 catch (exception& e) {
253 auto_ptr_char id(entity.getEntityID());
255 "filtering out AuthnAuthorityDescriptor for entity (%s) after failed signature check: %s", id.get(), e.what()
257 authn.erase(authn.begin() + i);
261 VectorOf(AttributeAuthorityDescriptor) aa=entity.getAttributeAuthorityDescriptors();
262 for (VectorOf(AttributeAuthorityDescriptor)::size_type i=0; i<aa.size(); ) {
264 verifySignature(aa[i]->getSignature(), entity.getEntityID());
267 catch (exception& e) {
268 auto_ptr_char id(entity.getEntityID());
270 "filtering out AttributeAuthorityDescriptor for entity (%s) after failed signature check: %s", id.get(), e.what()
272 aa.erase(aa.begin() + i);
276 VectorOf(PDPDescriptor) pdp=entity.getPDPDescriptors();
277 for (VectorOf(AuthnAuthorityDescriptor)::size_type i=0; i<pdp.size(); ) {
279 verifySignature(pdp[i]->getSignature(), entity.getEntityID());
282 catch (exception& e) {
283 auto_ptr_char id(entity.getEntityID());
285 "filtering out PDPDescriptor for entity (%s) after failed signature check: %s", id.get(), e.what()
287 pdp.erase(pdp.begin() + i);
291 VectorOf(AuthnQueryDescriptorType) authnq=entity.getAuthnQueryDescriptorTypes();
292 for (VectorOf(AuthnQueryDescriptorType)::size_type i=0; i<authnq.size(); ) {
294 verifySignature(authnq[i]->getSignature(), entity.getEntityID());
297 catch (exception& e) {
298 auto_ptr_char id(entity.getEntityID());
300 "filtering out AuthnQueryDescriptorType for entity (%s) after failed signature check: %s", id.get(), e.what()
302 authnq.erase(authnq.begin() + i);
306 VectorOf(AttributeQueryDescriptorType) attrq=entity.getAttributeQueryDescriptorTypes();
307 for (VectorOf(AttributeQueryDescriptorType)::size_type i=0; i<attrq.size(); ) {
309 verifySignature(attrq[i]->getSignature(), entity.getEntityID());
312 catch (exception& e) {
313 auto_ptr_char id(entity.getEntityID());
315 "filtering out AttributeQueryDescriptorType for entity (%s) after failed signature check: %s", id.get(), e.what()
317 attrq.erase(attrq.begin() + i);
321 VectorOf(AuthzDecisionQueryDescriptorType) authzq=entity.getAuthzDecisionQueryDescriptorTypes();
322 for (VectorOf(AuthzDecisionQueryDescriptorType)::size_type i=0; i<authzq.size(); ) {
324 verifySignature(authzq[i]->getSignature(), entity.getEntityID());
327 catch (exception& e) {
328 auto_ptr_char id(entity.getEntityID());
330 "filtering out AuthzDecisionQueryDescriptorType for entity (%s) after failed signature check: %s", id.get(), e.what()
332 authzq.erase(authzq.begin() + i);
336 VectorOf(RoleDescriptor) v=entity.getRoleDescriptors();
337 for (VectorOf(RoleDescriptor)::size_type i=0; i<v.size(); ) {
339 verifySignature(v[i]->getSignature(), entity.getEntityID());
342 catch (exception& e) {
343 auto_ptr_char id(entity.getEntityID());
345 "filtering out role (%s) for entity (%s) after failed signature check: %s",
346 v[i]->getElementQName().toString().c_str(), id.get(), e.what()
348 v.erase(v.begin() + i);
352 if (entity.getAffiliationDescriptor()) {
354 verifySignature(entity.getAffiliationDescriptor()->getSignature(), entity.getEntityID());
356 catch (exception& e) {
357 auto_ptr_char id(entity.getEntityID());
358 m_log.warn("filtering out affiliation from entity (%s) after failed signature check: %s", id.get(), e.what());
359 entity.setAffiliationDescriptor(NULL);
364 void SignatureMetadataFilter::verifySignature(Signature* sig, const XMLCh* peerName) const
369 m_profileValidator.validate(sig);
372 CredentialCriteria cc;
373 cc.setUsage(Credential::SIGNING_CREDENTIAL);
374 cc.setSignature(*sig, CredentialCriteria::KEYINFO_EXTRACTION_KEY);
376 if (m_credResolver) {
378 auto_ptr_char pname(peerName);
379 cc.setPeerName(pname.get());
381 Locker locker(m_credResolver);
382 vector<const Credential*> creds;
383 if (m_credResolver->resolve(creds,&cc)) {
384 SignatureValidator sigValidator;
385 for (vector<const Credential*>::const_iterator i = creds.begin(); i != creds.end(); ++i) {
387 sigValidator.setCredential(*i);
388 sigValidator.validate(sig);
394 throw MetadataFilterException("CredentialResolver did not supply a successful verification key.");
397 throw MetadataFilterException("CredentialResolver did not supply a successful verification key.");
401 if (m_verifyName && peerName) {
402 auto_ptr_char pname(peerName);
403 cc.setPeerName(pname.get());
405 DummyCredentialResolver dummy;
406 if (m_trust->validate(*sig, dummy, &cc))
408 throw MetadataFilterException("TrustEngine unable to verify signature.");
411 throw MetadataFilterException("Unable to verify signature.");