saml/saml2/profile/impl/DelegationRestrictionRule.cpp

   1 /*
   2  *  Copyright 2009-2010 Internet2
   3  *
   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
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  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.
  15  */
  16
  17 /**
  18  * DelegationRestrictionRule.cpp
  19  *
  20  * SAML DelegationRestriction SecurityPolicyRule.
  21  */
  22
  23 #include "internal.h"
  24 #include "exceptions.h"
  25 #include "binding/SecurityPolicyRule.h"
  26 #include "saml2/core/Assertions.h"
  27 #include "util/SAMLConstants.h"
  28
  29 #include <ctime>
  30 #include <xercesc/util/XMLUniDefs.hpp>
  31 #include <xmltooling/logging.h>
  32 #include <xmltooling/XMLToolingConfig.h>
  33
  34 using namespace opensaml::saml2;
  35 using namespace opensaml;
  36 using namespace xmltooling::logging;
  37 using namespace xmltooling;
  38 using namespace std;
  39
  40 namespace opensaml {
  41     namespace saml2 {
  42         class SAML_DLLLOCAL DelegationRestrictionRule : public SecurityPolicyRule
  43         {
  44         public:
  45             DelegationRestrictionRule(const DOMElement* e);
  46
  47             virtual ~DelegationRestrictionRule() {
  48                 for_each(m_delegates.begin(), m_delegates.end(), xmltooling::cleanup<Delegate>());
  49             }
  50             const char* getType() const {
  51                 return DELEGATION_POLICY_RULE;
  52             }
  53             bool evaluate(const XMLObject& message, const GenericRequest* request, SecurityPolicy& policy) const;
  54
  55         private:
  56             vector<Delegate*> m_delegates;
  57             enum {
  58                 MATCH_ANY,
  59                 MATCH_NEWEST,
  60                 MATCH_OLDEST
  61             } m_match;
  62             time_t m_maxTime;
  63         };
  64
  65         SecurityPolicyRule* SAML_DLLLOCAL DelegationRestrictionRuleFactory(const DOMElement* const & e)
  66         {
  67             return new DelegationRestrictionRule(e);
  68         }
  69
  70         class SAML_DLLLOCAL _isSameDelegate : public binary_function<const Delegate*,const Delegate*,bool>,
  71             public unary_function<const Delegate*,bool>
  72         {
  73             const Delegate* m_operand;
  74             bool isSameFormat(const XMLCh* f1, const XMLCh* f2) const {
  75                 if (!f1 || !*f1)
  76                     f1 = NameIDType::UNSPECIFIED;
  77                 if (!f2 || !*f2)
  78                     f2 = NameIDType::UNSPECIFIED;
  79                 return XMLString::equals(f1, f2);
  80             }
  81             bool matches(const NameID* n1, const NameID* n2) const {
  82                 return (isSameFormat(n1->getFormat(), n2->getFormat()) &&
  83                         XMLString::equals(n1->getName(), n2->getName()) &&
  84                         XMLString::equals(n1->getNameQualifier(), n2->getNameQualifier()) &&
  85                         XMLString::equals(n1->getSPNameQualifier(), n2->getSPNameQualifier()));
  86             }
  87         public:
  88             _isSameDelegate() : m_operand(nullptr) {}
  89             _isSameDelegate(const Delegate* d) : m_operand(d) {}
  90
  91             // d1 is the input from the message, d2 is from the policy
  92             bool operator()(const Delegate* d1, const Delegate* d2) const {
  93                 if (!d1->getNameID()) {
  94                     Category::getInstance(SAML_LOGCAT".SecurityPolicyRule.DelegationRestriction").error(
  95                         "rule doesn't support evaluation of BaseID or EncryptedID in a Delegate"
  96                         );
  97                     return false;
  98                 }
  99                 if (!d2->getConfirmationMethod() || XMLString::equals(d1->getConfirmationMethod(), d2->getConfirmationMethod())) {
 100                     return matches(d1->getNameID(), d2->getNameID());
 101                 }
 102                 return false;
 103             }
 104
 105             // d is from the policy
 106             bool operator()(const Delegate* d) const {
 107                 return this->operator()(m_operand, d);
 108             }
 109         };
 110
 111         static XMLCh match[] =  UNICODE_LITERAL_5(m,a,t,c,h);
 112         static XMLCh any[] =    UNICODE_LITERAL_8(a,n,y,O,r,d,e,r);
 113         static XMLCh newest[] = UNICODE_LITERAL_6(n,e,w,e,s,t);
 114         static XMLCh oldest[] = UNICODE_LITERAL_6(o,l,d,e,s,t);
 115         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);
 116     }
 117 };
 118
 119 DelegationRestrictionRule::DelegationRestrictionRule(const DOMElement* e) : m_match(MATCH_ANY), m_maxTime(0)
 120 {
 121     if (e) {
 122         const XMLCh* m = e->getAttributeNS(nullptr, match);
 123         if (XMLString::equals(m, newest))
 124             m_match = MATCH_NEWEST;
 125         else if (XMLString::equals(m, oldest))
 126             m_match = MATCH_OLDEST;
 127         else if (m && *m && !XMLString::equals(m, any))
 128             throw SecurityPolicyException("Invalid value for \"match\" attribute in Delegation rule.");
 129         m = e->getAttributeNS(nullptr, maxTimeSinceDelegation);
 130         if (m && *m)
 131             m_maxTime = XMLString::parseInt(m);
 132
 133         try {
 134             DOMElement* d = XMLHelper::getFirstChildElement(e, samlconstants::SAML20_DELEGATION_CONDITION_NS, Delegate::LOCAL_NAME);
 135             while (d) {
 136                 auto_ptr<XMLObject> wrapper(XMLObjectBuilder::buildOneFromElement(d));
 137                 Delegate* down = dynamic_cast<Delegate*>(wrapper.get());
 138                 if (down) {
 139                     m_delegates.push_back(down);
 140                     wrapper.release();
 141                 }
 142                 d = XMLHelper::getNextSiblingElement(d, samlconstants::SAML20_DELEGATION_CONDITION_NS, Delegate::LOCAL_NAME);
 143             }
 144         }
 145         catch (exception&) {
 146             for_each(m_delegates.begin(), m_delegates.end(), xmltooling::cleanup<Delegate>());
 147             throw;
 148         }
 149     }
 150 }
 151
 152 bool DelegationRestrictionRule::evaluate(const XMLObject& message, const GenericRequest* request, SecurityPolicy& policy) const
 153 {
 154     const DelegationRestrictionType* drt=dynamic_cast<const DelegationRestrictionType*>(&message);
 155     if (!drt)
 156         return false;
 157     const vector<Delegate*>& dels = drt->getDelegates();
 158
 159     if (!m_delegates.empty()) {
 160         if (m_match == MATCH_ANY) {
 161             // Each Delegate in the condition MUST match an embedded Delegate.
 162             for (vector<Delegate*>::const_iterator d1 = dels.begin(); d1 != dels.end(); ++d1) {
 163                 if (find_if(m_delegates.begin(), m_delegates.end(), _isSameDelegate(*d1)) == m_delegates.end())
 164                     return false;
 165             }
 166         }
 167         else if (m_match == MATCH_OLDEST) {
 168             if (search(dels.begin(), dels.end(), m_delegates.begin(), m_delegates.end(), _isSameDelegate()) != dels.begin())
 169                 return false;
 170         }
 171         else if (m_match == MATCH_NEWEST) {
 172             if (search(dels.rbegin(), dels.rend(), m_delegates.begin(), m_delegates.end(), _isSameDelegate()) != dels.rbegin())
 173                 return false;
 174         }
 175     }
 176
 177     if (m_maxTime > 0) {
 178         return (!dels.empty() && dels.front()->getDelegationInstant() &&
 179             (time(nullptr) - dels.front()->getDelegationInstantEpoch() - XMLToolingConfig::getConfig().clock_skew_secs <= m_maxTime));
 180     }
 181
 182     return true;
 183 }