saml/saml2/profile/impl/DelegationRestrictionRule.cpp

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