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 "binding/MessageFlowRule.h"
27 #include <log4cpp/Category.hh>
28 #include <xmltooling/util/ReplayCache.h>
29 #include <xercesc/util/XMLUniDefs.hpp>
31 using namespace opensaml;
32 using namespace xmltooling;
33 using namespace log4cpp;
37 SecurityPolicyRule* SAML_DLLLOCAL MessageFlowRuleFactory(const DOMElement* const & e)
39 return new MessageFlowRule(e);
43 static const XMLCh checkReplay[] = UNICODE_LITERAL_11(c,h,e,c,k,R,e,p,l,a,y);
44 static const XMLCh expires[] = UNICODE_LITERAL_7(e,x,p,i,r,e,s);
46 MessageFlowRule::MessageFlowRule(const DOMElement* e)
47 : m_checkReplay(true), m_expires(XMLToolingConfig::getConfig().clock_skew_secs)
50 const XMLCh* attr = e->getAttributeNS(NULL, checkReplay);
51 if (attr && (*attr==chLatin_f || *attr==chDigit_0))
52 m_checkReplay = false;
53 attr = e->getAttributeNS(NULL, expires);
55 m_expires = XMLString::parseInt(attr);
59 void MessageFlowRule::evaluate(const XMLObject& message, const GenericRequest* request, SecurityPolicy& policy) const
61 Category& log=Category::getInstance(SAML_LOGCAT".SecurityPolicyRule.MessageFlow");
62 log.debug("evaluating message flow policy (replay checking %s, expiration %lu)", m_checkReplay ? "on" : "off", m_expires);
64 time_t issueInstant = policy.getIssueInstant();
65 if (issueInstant == 0) {
66 log.error("unknown message timestamp");
67 throw BindingException("Message rejected, no timestamp available.");
70 time_t skew = XMLToolingConfig::getConfig().clock_skew_secs;
71 time_t now = time(NULL);
72 if (issueInstant > now + skew) {
73 log.errorStream() << "rejected not-yet-valid message, timestamp (" << issueInstant <<
74 "), newest allowed (" << now + skew << ")" << CategoryStream::ENDLINE;
75 throw BindingException("Message rejected, was issued in the future.");
77 else if (issueInstant < now - skew - m_expires) {
78 log.errorStream() << "rejected expired message, timestamp (" << issueInstant <<
79 "), oldest allowed (" << (now - skew - m_expires) << ")" << CategoryStream::ENDLINE;
80 throw BindingException("Message expired, was issued too long ago.");
85 const XMLCh* id = policy.getMessageID();
86 ReplayCache* replayCache = XMLToolingConfig::getConfig().getReplayCache();
88 throw BindingException("Message rejected, no ReplayCache instance available.");
90 throw BindingException("Message rejected, did not contain an identifier.");
91 auto_ptr_char temp(id);
92 if (!replayCache->check("SAML", temp.get(), issueInstant + skew + m_expires)) {
93 log.error("replay detected of message ID (%s)", temp.get());
94 throw BindingException("Rejecting replayed message ID ($1).", params(1,temp.get()));