saml/profile/impl/ConditionsRule.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  * ConditionsRule.cpp
  19  *
  20  * SAML Conditions SecurityPolicyRule.
  21  */
  22
  23 #include "internal.h"
  24 #include "exceptions.h"
  25 #include "binding/SecurityPolicy.h"
  26 #include "binding/SecurityPolicyRule.h"
  27 #include "saml1/core/Assertions.h"
  28 #include "saml2/core/Assertions.h"
  29
  30 #include <xercesc/util/XMLUniDefs.hpp>
  31 #include <xmltooling/logging.h>
  32 #include <xmltooling/XMLToolingConfig.h>
  33 #include <xmltooling/util/ParserPool.h>
  34
  35 using namespace opensaml;
  36 using namespace xmltooling::logging;
  37 using namespace xmltooling;
  38 using namespace std;
  39
  40 namespace opensaml {
  41     class SAML_DLLLOCAL ConditionsRule : public SecurityPolicyRule
  42     {
  43     public:
  44         ConditionsRule(const DOMElement* e);
  45
  46         virtual ~ConditionsRule() {
  47             for_each(m_rules.begin(), m_rules.end(), xmltooling::cleanup<SecurityPolicyRule>());
  48             if (m_doc)
  49                 m_doc->release();
  50         }
  51         const char* getType() const {
  52             return CONDITIONS_POLICY_RULE;
  53         }
  54         bool evaluate(const XMLObject& message, const GenericRequest* request, SecurityPolicy& policy) const;
  55
  56     private:
  57         DOMDocument* m_doc;
  58         vector<SecurityPolicyRule*> m_rules;
  59     };
  60
  61     SecurityPolicyRule* SAML_DLLLOCAL ConditionsRuleFactory(const DOMElement* const & e)
  62     {
  63         return new ConditionsRule(e);
  64     }
  65
  66     static const XMLCh Rule[] =     UNICODE_LITERAL_10(P,o,l,i,c,y,R,u,l,e);
  67     static const XMLCh type[] =     UNICODE_LITERAL_4(t,y,p,e);
  68
  69     const char config[] =
  70         "<PolicyRule type=\"Conditions\" xmlns:saml2=\"urn:oasis:names:tc:SAML:2.0:assertion\" xmlns:saml=\"urn:oasis:names:tc:SAML:1.0:assertion\">"
  71             "<PolicyRule type=\"Audience\"/>"
  72             "<PolicyRule type=\"Ignore\">saml:DoNotCacheCondition</PolicyRule>"
  73             "<PolicyRule type=\"Ignore\">saml2:OneTimeUse</PolicyRule>"
  74             "<PolicyRule type=\"Ignore\">saml2:ProxyRestriction</PolicyRule>"
  75         "</PolicyRule>";
  76 };
  77
  78 ConditionsRule::ConditionsRule(const DOMElement* e) : m_doc(NULL)
  79 {
  80     Category& log=Category::getInstance(SAML_LOGCAT".SecurityPolicyRule.Conditions");
  81
  82     if (!e || !e->hasChildNodes()) {
  83         // Default the configuration.
  84         istringstream in(config);
  85         m_doc = XMLToolingConfig::getConfig().getParser().parse(in);
  86         e = m_doc->getDocumentElement();
  87     }
  88
  89     e = XMLHelper::getFirstChildElement(e, Rule);
  90     while (e) {
  91         auto_ptr_char temp(e->getAttributeNS(NULL, type));
  92         if (temp.get() && *temp.get()) {
  93             try {
  94                 log.info("building SecurityPolicyRule of type %s", temp.get());
  95                 m_rules.push_back(SAMLConfig::getConfig().SecurityPolicyRuleManager.newPlugin(temp.get(),e));
  96             }
  97             catch (exception& ex) {
  98                 log.crit("error building SecurityPolicyRule: %s", ex.what());
  99             }
 100         }
 101         e = XMLHelper::getNextSiblingElement(e, Rule);
 102     }
 103 }
 104
 105 bool ConditionsRule::evaluate(const XMLObject& message, const GenericRequest* request, SecurityPolicy& policy) const
 106 {
 107     const saml2::Assertion* a2=dynamic_cast<const saml2::Assertion*>(&message);
 108     if (a2) {
 109         const saml2::Conditions* conds = a2->getConditions();
 110         if (!conds)
 111             return true;
 112
 113         // First verify the time conditions, using the specified timestamp.
 114         time_t now = policy.getTime();
 115         unsigned int skew = XMLToolingConfig::getConfig().clock_skew_secs;
 116         time_t t = conds->getNotBeforeEpoch();
 117         if (now + skew < t)
 118             throw SecurityPolicyException("Assertion is not yet valid.");
 119         t = conds->getNotOnOrAfterEpoch();
 120         if (t <= now - skew)
 121             throw SecurityPolicyException("Assertion is no longer valid.");
 122
 123         // Now we process conditions, starting with the known types and then extensions.
 124
 125         bool valid;
 126
 127         const vector<saml2::AudienceRestriction*>& acvec = conds->getAudienceRestrictions();
 128         for (vector<saml2::AudienceRestriction*>::const_iterator ac = acvec.begin(); ac != acvec.end(); ++ac) {
 129             valid = false;
 130             for (vector<SecurityPolicyRule*>::const_iterator r = m_rules.begin(); !valid && r != m_rules.end(); ++r)
 131                 valid = (*r)->evaluate(*(*ac), request, policy);
 132             if (!valid)
 133                 throw SecurityPolicyException("AudienceRestriction condition not successfully validated by policy.");
 134         }
 135
 136         const vector<saml2::OneTimeUse*>& otvec = conds->getOneTimeUses();
 137         for (vector<saml2::OneTimeUse*>::const_iterator ot = otvec.begin(); ot!=otvec.end(); ++ot) {
 138             valid = false;
 139             for (vector<SecurityPolicyRule*>::const_iterator r = m_rules.begin(); !valid && r != m_rules.end(); ++r)
 140                 valid = (*r)->evaluate(*(*ot), request, policy);
 141             if (!valid)
 142                 throw SecurityPolicyException("OneTimeUse condition not successfully validated by policy.");
 143         }
 144
 145         const vector<saml2::ProxyRestriction*> pvec = conds->getProxyRestrictions();
 146         for (vector<saml2::ProxyRestriction*>::const_iterator p = pvec.begin(); p != pvec.end(); ++p) {
 147             valid = false;
 148             for (vector<SecurityPolicyRule*>::const_iterator r = m_rules.begin(); !valid && r != m_rules.end(); ++r)
 149                 valid = (*r)->evaluate(*(*p), request, policy);
 150             if (!valid)
 151                 throw SecurityPolicyException("ProxyRestriction condition not successfully validated by policy.");
 152         }
 153
 154         const vector<saml2::Condition*>& convec = conds->getConditions();
 155         for (vector<saml2::Condition*>::const_iterator c = convec.begin(); c != convec.end(); ++c) {
 156             valid = false;
 157             for (vector<SecurityPolicyRule*>::const_iterator r = m_rules.begin(); !valid && r != m_rules.end(); ++r)
 158                 valid = (*r)->evaluate(*(*c), request, policy);
 159             if (!valid) {
 160                 throw SecurityPolicyException(
 161                     "Extension condition ($1) not successfully validated by policy.",
 162                     params(1,((*c)->getSchemaType() ? (*c)->getSchemaType()->toString().c_str() : "Unknown Type"))
 163                     );
 164             }
 165         }
 166
 167         return true;
 168     }
 169
 170     const saml1::Assertion* a1=dynamic_cast<const saml1::Assertion*>(&message);
 171     if (a1) {
 172         const saml1::Conditions* conds = a1->getConditions();
 173         if (!conds)
 174             return true;
 175
 176         // First verify the time conditions, using the specified timestamp.
 177         time_t now = policy.getTime();
 178         unsigned int skew = XMLToolingConfig::getConfig().clock_skew_secs;
 179         time_t t = conds->getNotBeforeEpoch();
 180         if (now + skew < t)
 181             throw SecurityPolicyException("Assertion is not yet valid.");
 182         t = conds->getNotOnOrAfterEpoch();
 183         if (t <= now - skew)
 184             throw SecurityPolicyException("Assertion is no longer valid.");
 185
 186         // Now we process conditions, starting with the known types and then extensions.
 187
 188         bool valid;
 189
 190         const vector<saml1::AudienceRestrictionCondition*>& acvec = conds->getAudienceRestrictionConditions();
 191         for (vector<saml1::AudienceRestrictionCondition*>::const_iterator ac = acvec.begin(); ac != acvec.end(); ++ac) {
 192             valid = false;
 193             for (vector<SecurityPolicyRule*>::const_iterator r = m_rules.begin(); !valid && r != m_rules.end(); ++r)
 194                 valid = (*r)->evaluate(*(*ac), request, policy);
 195             if (!valid)
 196                 throw SecurityPolicyException("AudienceRestrictionCondition not successfully validated by policy.");
 197         }
 198
 199         const vector<saml1::DoNotCacheCondition*>& dncvec = conds->getDoNotCacheConditions();
 200         for (vector<saml1::DoNotCacheCondition*>::const_iterator dnc = dncvec.begin(); dnc != dncvec.end(); ++dnc) {
 201             valid = false;
 202             for (vector<SecurityPolicyRule*>::const_iterator r = m_rules.begin(); !valid && r != m_rules.end(); ++r)
 203                 valid = (*r)->evaluate(*(*dnc), request, policy);
 204             if (!valid)
 205                 throw SecurityPolicyException("DoNotCacheCondition not successfully validated by policy.");
 206         }
 207
 208         const vector<saml1::Condition*>& convec = conds->getConditions();
 209         for (vector<saml1::Condition*>::const_iterator c = convec.begin(); c != convec.end(); ++c) {
 210             valid = false;
 211             for (vector<SecurityPolicyRule*>::const_iterator r = m_rules.begin(); !valid && r != m_rules.end(); ++r)
 212                 valid = (*r)->evaluate(*(*c), request, policy);
 213             if (!valid) {
 214                 throw SecurityPolicyException(
 215                     "Extension condition ($1) not successfully validated by policy.",
 216                     params(1,((*c)->getSchemaType() ? (*c)->getSchemaType()->toString().c_str() : (*c)->getElementQName().toString().c_str()))
 217                     );
 218             }
 219         }
 220
 221         return true;
 222     }
 223
 224     return false;
 225 }