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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.
*
* 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.
*/
/**
* DelegationRestrictionRule.cpp
*
* SAML DelegationRestriction SecurityPolicyRule.
*/
#include "internal.h"
#include "exceptions.h"
#include "binding/SecurityPolicyRule.h"
#include "saml2/core/Assertions.h"
#include "util/SAMLConstants.h"
#include <ctime>
#include <boost/ptr_container/ptr_vector.hpp>
#include <xercesc/util/XMLUniDefs.hpp>
#include <xmltooling/logging.h>
#include <xmltooling/XMLToolingConfig.h>
using namespace opensaml::saml2;
using namespace opensaml;
using namespace xmltooling::logging;
using namespace xmltooling;
using namespace boost;
using namespace std;
namespace opensaml {
namespace saml2 {
class SAML_DLLLOCAL DelegationRestrictionRule : public SecurityPolicyRule
{
public:
DelegationRestrictionRule(const DOMElement* e);
virtual ~DelegationRestrictionRule() {
}
const char* getType() const {
return DELEGATION_POLICY_RULE;
}
bool evaluate(const XMLObject& message, const GenericRequest* request, SecurityPolicy& policy) const;
private:
ptr_vector<Delegate> m_delegates;
enum {
MATCH_ANY,
MATCH_NEWEST,
MATCH_OLDEST
} m_match;
time_t m_maxTime;
};
SecurityPolicyRule* SAML_DLLLOCAL DelegationRestrictionRuleFactory(const DOMElement* const & e, bool)
{
return new DelegationRestrictionRule(e);
}
class SAML_DLLLOCAL _isSameDelegate : public binary_function<const Delegate*,const Delegate*,bool>,
public unary_function<const Delegate*,bool>
{
const Delegate* m_operand;
bool isSameFormat(const XMLCh* f1, const XMLCh* f2) const {
if (!f1 || !*f1)
f1 = NameIDType::UNSPECIFIED;
if (!f2 || !*f2)
f2 = NameIDType::UNSPECIFIED;
return XMLString::equals(f1, f2);
}
bool matches(const NameID* n1, const NameID* n2) const {
return (isSameFormat(n1->getFormat(), n2->getFormat()) &&
XMLString::equals(n1->getName(), n2->getName()) &&
XMLString::equals(n1->getNameQualifier(), n2->getNameQualifier()) &&
XMLString::equals(n1->getSPNameQualifier(), n2->getSPNameQualifier()));
}
public:
_isSameDelegate() : m_operand(nullptr) {}
_isSameDelegate(const Delegate* d) : m_operand(d) {}
// d1 is the input from the message, d2 is from the policy
bool operator()(const Delegate* d1, const Delegate& d2) const {
if (!d1->getNameID()) {
Category::getInstance(SAML_LOGCAT ".SecurityPolicyRule.DelegationRestriction").error(
"rule doesn't support evaluation of BaseID or EncryptedID in a Delegate"
);
return false;
}
if (!d2.getConfirmationMethod() || XMLString::equals(d1->getConfirmationMethod(), d2.getConfirmationMethod())) {
return matches(d1->getNameID(), d2.getNameID());
}
return false;
}
// d is from the policy
bool operator()(const Delegate& d) const {
return this->operator()(m_operand, d);
}
};
static XMLCh match[] = UNICODE_LITERAL_5(m,a,t,c,h);
static XMLCh any[] = UNICODE_LITERAL_8(a,n,y,O,r,d,e,r);
static XMLCh newest[] = UNICODE_LITERAL_6(n,e,w,e,s,t);
static XMLCh oldest[] = UNICODE_LITERAL_6(o,l,d,e,s,t);
static XMLCh maxTimeSinceDelegation[] = UNICODE_LITERAL_22(m,a,x,T,i,m,e,S,i,n,c,e,D,e,l,e,g,a,t,i,o,n);
}
};
DelegationRestrictionRule::DelegationRestrictionRule(const DOMElement* e)
: SecurityPolicyRule(e), m_match(MATCH_ANY), m_maxTime(XMLHelper::getAttrInt(e, 0, maxTimeSinceDelegation))
{
if (e) {
const XMLCh* m = e ? e->getAttributeNS(nullptr, match) : nullptr;
if (XMLString::equals(m, newest))
m_match = MATCH_NEWEST;
else if (XMLString::equals(m, oldest))
m_match = MATCH_OLDEST;
else if (m && *m && !XMLString::equals(m, any))
throw SecurityPolicyException("Invalid value for \"match\" attribute in Delegation rule.");
DOMElement* d = XMLHelper::getFirstChildElement(e, samlconstants::SAML20_DELEGATION_CONDITION_NS, Delegate::LOCAL_NAME);
while (d) {
auto_ptr<XMLObject> wrapper(XMLObjectBuilder::buildOneFromElement(d));
Delegate* down = dynamic_cast<Delegate*>(wrapper.get());
if (down) {
m_delegates.push_back(down);
wrapper.release();
}
d = XMLHelper::getNextSiblingElement(d, samlconstants::SAML20_DELEGATION_CONDITION_NS, Delegate::LOCAL_NAME);
}
}
}
bool DelegationRestrictionRule::evaluate(const XMLObject& message, const GenericRequest* request, SecurityPolicy& policy) const
{
if (!SecurityPolicyRule::evaluate(message, request, policy)) {
return false;
}
const DelegationRestrictionType* drt=dynamic_cast<const DelegationRestrictionType*>(&message);
if (!drt)
return false;
const vector<Delegate*>& dels = drt->getDelegates();
if (!m_delegates.empty()) {
if (m_match == MATCH_ANY) {
// Each Delegate in the condition MUST match an embedded Delegate.
for (vector<Delegate*>::const_iterator d1 = dels.begin(); d1 != dels.end(); ++d1) {
if (find_if(m_delegates.begin(), m_delegates.end(), _isSameDelegate(*d1)) == m_delegates.end())
return false;
}
}
else if (m_match == MATCH_OLDEST) {
if (search(dels.begin(), dels.end(), m_delegates.begin(), m_delegates.end(), _isSameDelegate()) != dels.begin())
return false;
}
else if (m_match == MATCH_NEWEST) {
if (search(dels.rbegin(), dels.rend(), m_delegates.begin(), m_delegates.end(), _isSameDelegate()) != dels.rbegin())
return false;
}
}
if (m_maxTime > 0) {
return (!dels.empty() && dels.front()->getDelegationInstant() &&
(time(nullptr) - dels.front()->getDelegationInstantEpoch() - XMLToolingConfig::getConfig().clock_skew_secs <= m_maxTime));
}
return true;
}
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