2 * Copyright 2001-2007 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/MessageDecoder.h"
26 #include "saml2/core/Protocols.h"
27 #include "saml2/metadata/Metadata.h"
28 #include "saml2/metadata/MetadataProvider.h"
30 #include <xmltooling/logging.h>
31 #include <xercesc/util/Base64.hpp>
32 #include <xmltooling/io/HTTPRequest.h>
33 #include <xmltooling/util/NDC.h>
34 #include <xmltooling/validation/ValidatorSuite.h>
36 using namespace opensaml::saml2md;
37 using namespace opensaml::saml2p;
38 using namespace opensaml::saml2;
39 using namespace opensaml;
40 using namespace xmltooling::logging;
41 using namespace xmltooling;
46 class SAML_DLLLOCAL SAML2POSTDecoder : public MessageDecoder
50 virtual ~SAML2POSTDecoder() {}
52 xmltooling::XMLObject* decode(
53 std::string& relayState,
54 const GenericRequest& genericRequest,
55 SecurityPolicy& policy
59 MessageDecoder* SAML_DLLLOCAL SAML2POSTDecoderFactory(const pair<const DOMElement*,const XMLCh*>& p)
61 return new SAML2POSTDecoder();
66 XMLObject* SAML2POSTDecoder::decode(
67 std::string& relayState,
68 const GenericRequest& genericRequest,
69 SecurityPolicy& policy
73 xmltooling::NDC ndc("decode");
75 Category& log = Category::getInstance(SAML_LOGCAT".MessageDecoder.SAML2POST");
77 log.debug("validating input");
78 const HTTPRequest* httpRequest=dynamic_cast<const HTTPRequest*>(&genericRequest);
80 throw BindingException("Unable to cast request object to HTTPRequest type.");
81 if (strcmp(httpRequest->getMethod(),"POST"))
82 throw BindingException("Invalid HTTP method ($1).", params(1, httpRequest->getMethod()));
83 const char* msg = httpRequest->getParameter("SAMLResponse");
85 msg = httpRequest->getParameter("SAMLRequest");
87 throw BindingException("Request missing SAMLRequest or SAMLResponse parameter.");
88 const char* state = httpRequest->getParameter("RelayState");
94 // Decode the base64 into SAML.
96 XMLByte* decoded=Base64::decode(reinterpret_cast<const XMLByte*>(msg),&x);
98 throw BindingException("Unable to decode base64 in POST binding message.");
99 log.debug("decoded SAML message:\n%s", decoded);
100 istringstream is(reinterpret_cast<char*>(decoded));
101 XMLString::release(&decoded);
103 // Parse and bind the document into an XMLObject.
104 DOMDocument* doc = (policy.getValidating() ? XMLToolingConfig::getConfig().getValidatingParser()
105 : XMLToolingConfig::getConfig().getParser()).parse(is);
106 XercesJanitor<DOMDocument> janitor(doc);
107 auto_ptr<XMLObject> xmlObject(XMLObjectBuilder::buildOneFromElement(doc->getDocumentElement(), true));
110 saml2::RootObject* root = NULL;
111 StatusResponseType* response = NULL;
112 RequestAbstractType* request = dynamic_cast<RequestAbstractType*>(xmlObject.get());
114 response = dynamic_cast<StatusResponseType*>(xmlObject.get());
116 throw BindingException("XML content for SAML 2.0 HTTP-POST Decoder must be a SAML 2.0 protocol message.");
117 root = static_cast<saml2::RootObject*>(response);
120 root = static_cast<saml2::RootObject*>(request);
123 if (!policy.getValidating())
124 SchemaValidators.validate(xmlObject.get());
126 // Run through the policy.
127 policy.evaluate(*root, &genericRequest, samlconstants::SAML20P_NS);
129 // Check destination URL.
130 auto_ptr_char dest(request ? request->getDestination() : response->getDestination());
131 const char* dest2 = httpRequest->getRequestURL();
132 const char* delim = strchr(dest2, '?');
133 if ((root->getSignature() || httpRequest->getParameter("Signature")) && (!dest.get() || !*(dest.get()))) {
134 log.error("signed SAML message missing Destination attribute");
135 throw BindingException("Signed SAML message missing Destination attribute identifying intended destination.");
137 else if (dest.get() && *dest.get() && ((delim && strncmp(dest.get(), dest2, delim - dest2)) || (!delim && strcmp(dest.get(),dest2)))) {
138 log.error("POST targeted at (%s), but delivered to (%s)", dest.get(), dest2);
139 throw BindingException("SAML message delivered with POST to incorrect server URL.");
142 return xmlObject.release();