2 * Copyright 2001-2006 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.
20 * SAML replay and freshness checking SecurityPolicyRule
24 #include "exceptions.h"
25 #include "RootObject.h"
26 #include "binding/MessageFlowRule.h"
27 #include "util/SAMLConstants.h"
29 #include <xmltooling/util/NDC.h>
30 #include <xmltooling/util/ReplayCache.h>
31 #include <log4cpp/Category.hh>
33 using namespace opensaml;
34 using namespace xmltooling;
35 using namespace log4cpp;
39 SecurityPolicyRule* SAML_DLLLOCAL MessageFlowRuleFactory(const DOMElement* const & e)
41 return new MessageFlowRule(e);
45 static const XMLCh checkReplay[] = UNICODE_LITERAL_11(c,h,e,c,k,R,e,p,l,a,y);
46 static const XMLCh expires[] = UNICODE_LITERAL_7(e,x,p,i,r,e,s);
48 MessageFlowRule::MessageFlowRule(const DOMElement* e)
49 : m_checkReplay(true), m_expires(XMLToolingConfig::getConfig().clock_skew_secs)
52 const XMLCh* attr = e->getAttributeNS(NULL, checkReplay);
53 if (attr && (*attr==chLatin_f || *attr==chDigit_0))
54 m_checkReplay = false;
55 attr = e->getAttributeNS(NULL, expires);
57 m_expires = XMLString::parseInt(attr);
61 pair<saml2::Issuer*,const saml2md::RoleDescriptor*> MessageFlowRule::evaluate(
62 const GenericRequest& request,
63 const XMLObject& message,
64 const saml2md::MetadataProvider* metadataProvider,
66 const TrustEngine* trustEngine
69 Category& log=Category::getInstance(SAML_LOGCAT".SecurityPolicyRule.MessageFlow");
70 log.debug("evaluating message flow policy");
73 const XMLCh* ns = message.getElementQName().getNamespaceURI();
74 if (ns && (XMLString::equals(ns, samlconstants::SAML20P_NS) || XMLString::equals(ns, samlconstants::SAML1P_NS))) {
75 const RootObject& obj = dynamic_cast<const RootObject&>(message);
76 check(obj.getID(), obj.getIssueInstantEpoch());
79 log.debug("ignoring unrecognized message type");
83 log.warn("caught a bad_cast while extracting issuer");
85 return pair<saml2::Issuer*,const saml2md::RoleDescriptor*>(NULL,NULL);
88 void MessageFlowRule::check(const XMLCh* id, time_t issueInstant) const
90 Category& log=Category::getInstance(SAML_LOGCAT".SecurityPolicyRule.MessageFlow");
91 log.debug("evaluating message flow policy (replay checking %s, expiration %lu)", m_checkReplay ? "on" : "off", m_expires);
93 time_t skew = XMLToolingConfig::getConfig().clock_skew_secs;
94 time_t now = time(NULL);
95 if (issueInstant > now + skew) {
96 log.errorStream() << "rejected not-yet-valid message, timestamp (" << issueInstant <<
97 "), newest allowed (" << now + skew << ")" << CategoryStream::ENDLINE;
98 throw BindingException("Message rejected, was issued in the future.");
100 else if (issueInstant < now - skew - m_expires) {
101 log.errorStream() << "rejected expired message, timestamp (" << issueInstant <<
102 "), oldest allowed (" << (now - skew - m_expires) << ")" << CategoryStream::ENDLINE;
103 throw BindingException("Message expired, was issued too long ago.");
108 ReplayCache* replayCache = XMLToolingConfig::getConfig().getReplayCache();
110 throw BindingException("No ReplayCache instance available.");
112 throw BindingException("Message did not contain an identifier.");
113 auto_ptr_char temp(id);
114 if (!replayCache->check("SAML", temp.get(), issueInstant + skew + m_expires)) {
115 log.error("replay detected of message ID (%s)", temp.get());
116 throw BindingException("Rejecting replayed message ID ($1).", params(1,temp.get()));