2 * Copyright 2001-2010 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.
18 * SAML2POSTDecoder.cpp
20 * SAML 2.0 HTTP POST binding message encoder.
24 #include "exceptions.h"
25 #include "binding/SecurityPolicy.h"
26 #include "saml2/binding/SAML2MessageDecoder.h"
27 #include "saml2/core/Protocols.h"
28 #include "saml2/metadata/Metadata.h"
29 #include "saml2/metadata/MetadataProvider.h"
31 #include <xercesc/framework/MemBufInputSource.hpp>
32 #include <xercesc/framework/Wrapper4InputSource.hpp>
33 #include <xercesc/util/Base64.hpp>
34 #include <xmltooling/logging.h>
35 #include <xmltooling/XMLToolingConfig.h>
36 #include <xmltooling/io/HTTPRequest.h>
37 #include <xmltooling/util/NDC.h>
38 #include <xmltooling/util/ParserPool.h>
39 #include <xmltooling/validation/ValidatorSuite.h>
41 using namespace opensaml::saml2md;
42 using namespace opensaml::saml2p;
43 using namespace opensaml::saml2;
44 using namespace opensaml;
45 using namespace xmltooling::logging;
46 using namespace xmltooling;
51 class SAML_DLLLOCAL SAML2POSTDecoder : public SAML2MessageDecoder
54 SAML2POSTDecoder(const DOMElement* e, const XMLCh* ns, bool simple=false) {
57 virtual ~SAML2POSTDecoder() {}
59 const char* getShortName() const {
60 return m_simple ? "POST-SimpleSign" : "POST";
63 xmltooling::XMLObject* decode(
64 std::string& relayState,
65 const GenericRequest& genericRequest,
66 SecurityPolicy& policy
73 MessageDecoder* SAML_DLLLOCAL SAML2POSTDecoderFactory(const pair<const DOMElement*,const XMLCh*>& p)
75 return new SAML2POSTDecoder(p.first, p.second, false);
78 MessageDecoder* SAML_DLLLOCAL SAML2POSTSimpleSignDecoderFactory(const pair<const DOMElement*,const XMLCh*>& p)
80 return new SAML2POSTDecoder(p.first, p.second, true);
85 XMLObject* SAML2POSTDecoder::decode(
86 std::string& relayState,
87 const GenericRequest& genericRequest,
88 SecurityPolicy& policy
92 xmltooling::NDC ndc("decode");
94 Category& log = Category::getInstance(SAML_LOGCAT".MessageDecoder.SAML2POST");
96 log.debug("validating input");
97 const HTTPRequest* httpRequest=dynamic_cast<const HTTPRequest*>(&genericRequest);
99 throw BindingException("Unable to cast request object to HTTPRequest type.");
100 if (strcmp(httpRequest->getMethod(),"POST"))
101 throw BindingException("Invalid HTTP method ($1).", params(1, httpRequest->getMethod()));
102 const char* msg = httpRequest->getParameter("SAMLResponse");
104 msg = httpRequest->getParameter("SAMLRequest");
106 throw BindingException("Request missing SAMLRequest or SAMLResponse form parameter.");
107 const char* state = httpRequest->getParameter("RelayState");
113 // Decode the base64 into SAML.
115 XMLByte* decoded=Base64::decode(reinterpret_cast<const XMLByte*>(msg),&x);
117 throw BindingException("Unable to decode base64 in POST binding message.");
118 log.debugStream() << "decoded SAML message:\n" << decoded << logging::eol;
120 // Parse and bind the document into an XMLObject.
121 MemBufInputSource src(decoded, x, "SAMLMessage", true);
122 Wrapper4InputSource dsrc(&src, false);
123 DOMDocument* doc = (policy.getValidating() ? XMLToolingConfig::getConfig().getValidatingParser()
124 : XMLToolingConfig::getConfig().getParser()).parse(dsrc);
125 XercesJanitor<DOMDocument> janitor(doc);
126 auto_ptr<XMLObject> xmlObject(XMLObjectBuilder::buildOneFromElement(doc->getDocumentElement(), true));
129 saml2::RootObject* root = nullptr;
130 StatusResponseType* response = nullptr;
131 RequestAbstractType* request = dynamic_cast<RequestAbstractType*>(xmlObject.get());
133 response = dynamic_cast<StatusResponseType*>(xmlObject.get());
135 throw BindingException("XML content for SAML 2.0 HTTP-POST Decoder must be a SAML 2.0 protocol message.");
136 root = static_cast<saml2::RootObject*>(response);
139 root = static_cast<saml2::RootObject*>(request);
142 SchemaValidators.validate(root);
144 // Run through the policy.
145 extractMessageDetails(*root, genericRequest, samlconstants::SAML20P_NS, policy);
146 policy.evaluate(*root, &genericRequest);
148 // Check destination URL.
149 auto_ptr_char dest(request ? request->getDestination() : response->getDestination());
150 const char* dest2 = httpRequest->getRequestURL();
151 const char* delim = strchr(dest2, '?');
152 if ((root->getSignature() || httpRequest->getParameter("Signature")) && (!dest.get() || !*(dest.get()))) {
153 log.error("signed SAML message missing Destination attribute");
154 throw BindingException("Signed SAML message missing Destination attribute identifying intended destination.");
156 else if (dest.get() && *dest.get() && ((delim && strncmp(dest.get(), dest2, delim - dest2)) || (!delim && strcmp(dest.get(),dest2)))) {
157 log.error("POST targeted at (%s), but delivered to (%s)", dest.get(), dest2);
158 throw BindingException("SAML message delivered with POST to incorrect server URL.");
161 return xmlObject.release();