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22 * GSSAPIAttributeExtractor.cpp
24 * AttributeExtractor for a base64-encoded GSS-API context or name.
29 #ifdef HAVE_GSSAPI_NAMINGEXTS
31 #include <shibsp/exceptions.h>
32 #include <shibsp/Application.h>
33 #include <shibsp/SPConfig.h>
34 #include <shibsp/attribute/BinaryAttribute.h>
35 #include <shibsp/attribute/ScopedAttribute.h>
36 #include <shibsp/attribute/SimpleAttribute.h>
37 #include <shibsp/attribute/resolver/AttributeExtractor.h>
38 #include <shibsp/remoting/ddf.h>
39 #include <shibsp/util/SPConstants.h>
40 #include <saml/saml1/core/Assertions.h>
41 #include <saml/saml2/metadata/Metadata.h>
42 #include <xmltooling/unicode.h>
43 #include <xmltooling/XMLToolingConfig.h>
44 #include <xmltooling/util/NDC.h>
45 #include <xmltooling/util/ReloadableXMLFile.h>
46 #include <xmltooling/util/Threads.h>
47 #include <xmltooling/util/XMLHelper.h>
48 #include <xercesc/util/Base64.hpp>
49 #include <xercesc/util/XMLUniDefs.hpp>
51 #ifdef SHIBSP_HAVE_GSSGNU
53 #elif defined SHIBSP_HAVE_GSSMIT
54 # include <gssapi/gssapi_ext.h>
60 using namespace shibsp;
61 using namespace opensaml::saml2md;
62 using namespace opensaml;
63 using namespace xmltooling;
64 using namespace xercesc;
69 #if defined (_MSC_VER)
70 #pragma warning( push )
71 #pragma warning( disable : 4250 )
74 class GSSAPIExtractorImpl
77 GSSAPIExtractorImpl(const DOMElement* e, Category& log);
78 ~GSSAPIExtractorImpl() {
80 m_document->release();
83 void setDocument(DOMDocument* doc) {
87 void extractAttributes(gss_name_t initiatorName, vector<Attribute*>& attributes) const;
88 void extractAttributes(gss_name_t initiatorName, gss_buffer_t namingAttribute, vector<Attribute*>& attributes) const;
90 void getAttributeIds(vector<string>& attributes) const {
91 attributes.insert(attributes.end(), m_attributeIds.begin(), m_attributeIds.end());
96 Rule() : authenticated(true), binary(false), scopeDelimiter(0) {}
98 bool authenticated,binary;
103 DOMDocument* m_document;
104 map<string,Rule> m_attrMap;
105 vector<string> m_attributeIds;
108 class GSSAPIExtractor : public AttributeExtractor, public ReloadableXMLFile
111 GSSAPIExtractor(const DOMElement* e)
112 : ReloadableXMLFile(e, Category::getInstance(SHIBSP_LOGCAT".AttributeExtractor.GSSAPI")), m_impl(nullptr) {
120 void extractAttributes(
121 const Application& application,
122 const RoleDescriptor* issuer,
123 const XMLObject& xmlObject,
124 vector<Attribute*>& attributes
127 void getAttributeIds(std::vector<std::string>& attributes) const {
129 m_impl->getAttributeIds(attributes);
133 pair<bool,DOMElement*> background_load();
136 GSSAPIExtractorImpl* m_impl;
139 #if defined (_MSC_VER)
140 #pragma warning( pop )
143 AttributeExtractor* GSSAPIExtractorFactory(const DOMElement* const & e)
145 return new GSSAPIExtractor(e);
148 static const XMLCh _aliases[] = UNICODE_LITERAL_7(a,l,i,a,s,e,s);
149 static const XMLCh Attributes[] = UNICODE_LITERAL_10(A,t,t,r,i,b,u,t,e,s);
150 static const XMLCh _authenticated[] = UNICODE_LITERAL_13(a,u,t,h,e,n,t,i,c,a,t,e,d);
151 static const XMLCh _binary[] = UNICODE_LITERAL_6(b,i,n,a,r,y);
152 static const XMLCh GSSAPIAttribute[] = UNICODE_LITERAL_15(G,S,S,A,P,I,A,t,t,r,i,b,u,t,e);
153 static const XMLCh _id[] = UNICODE_LITERAL_2(i,d);
154 static const XMLCh _name[] = UNICODE_LITERAL_4(n,a,m,e);
155 static const XMLCh _scopeDelimiter[] = UNICODE_LITERAL_14(s,c,o,p,e,D,e,l,i,m,i,t,e,r);
158 GSSAPIExtractorImpl::GSSAPIExtractorImpl(const DOMElement* e, Category& log)
159 : m_log(log), m_document(nullptr)
162 xmltooling::NDC ndc("GSSAPIExtractorImpl");
165 if (!XMLHelper::isNodeNamed(e, shibspconstants::SHIB2ATTRIBUTEMAP_NS, Attributes))
166 throw ConfigurationException("GSSAPI AttributeExtractor requires am:Attributes at root of configuration.");
168 DOMElement* child = XMLHelper::getFirstChildElement(e, shibspconstants::SHIB2ATTRIBUTEMAP_NS, GSSAPIAttribute);
170 // Check for missing name or id.
171 const XMLCh* name = child->getAttributeNS(nullptr, _name);
172 if (!name || !*name) {
173 m_log.warn("skipping GSSAPIAttribute with no name");
174 child = XMLHelper::getNextSiblingElement(child, shibspconstants::SHIB2ATTRIBUTEMAP_NS, GSSAPIAttribute);
178 auto_ptr_char id(child->getAttributeNS(nullptr, _id));
179 if (!id.get() || !*id.get()) {
180 m_log.warn("skipping GSSAPIAttribute with no id");
181 child = XMLHelper::getNextSiblingElement(child, shibspconstants::SHIB2ATTRIBUTEMAP_NS, GSSAPIAttribute);
184 else if (!strcmp(id.get(), "REMOTE_USER")) {
185 m_log.warn("skipping GSSAPIAttribute, id of REMOTE_USER is a reserved name");
186 child = XMLHelper::getNextSiblingElement(child, shibspconstants::SHIB2ATTRIBUTEMAP_NS, GSSAPIAttribute);
190 // Fetch/create the map entry and see if it's a duplicate rule.
191 auto_ptr_char attrname(name);
192 Rule& decl = m_attrMap[attrname.get()];
193 if (!decl.ids.empty()) {
194 m_log.warn("skipping duplicate GSS-API Attribute mapping (same name)");
195 child = XMLHelper::getNextSiblingElement(child, shibspconstants::SHIB2ATTRIBUTEMAP_NS, GSSAPIAttribute);
199 m_log.info("creating mapping for GSS-API Attribute %s", attrname.get());
201 decl.ids.push_back(id.get());
202 m_attributeIds.push_back(id.get());
204 name = child->getAttributeNS(nullptr, _aliases);
206 auto_ptr_char aliases(name);
208 char* start = const_cast<char*>(aliases.get());
209 while (start && *start) {
210 while (*start && isspace(*start))
214 pos = strchr(start,' ');
217 if (strcmp(start, "REMOTE_USER")) {
218 decl.ids.push_back(start);
219 m_attributeIds.push_back(start);
222 m_log.warn("skipping alias, REMOTE_USER is a reserved name");
224 start = pos ? pos+1 : nullptr;
228 decl.authenticated = XMLHelper::getAttrBool(child, true, _authenticated);
229 decl.binary = XMLHelper::getAttrBool(child, false, _binary);
230 string delim = XMLHelper::getAttrString(child, "", _scopeDelimiter);
232 decl.scopeDelimiter = delim[0];
234 child = XMLHelper::getNextSiblingElement(child, shibspconstants::SHIB2ATTRIBUTEMAP_NS, GSSAPIAttribute);
238 void GSSAPIExtractorImpl::extractAttributes(gss_name_t initiatorName, vector<Attribute*>& attributes) const
241 gss_buffer_set_t attrnames = GSS_C_NO_BUFFER_SET;
242 OM_uint32 major = gss_inquire_name(&minor, initiatorName, nullptr, nullptr, &attrnames);
243 if (major == GSS_S_COMPLETE) {
244 for (size_t i = 0; i < attrnames->count; ++i) {
245 extractAttributes(initiatorName, &attrnames->elements[i], attributes);
247 gss_release_buffer_set(&minor, &attrnames);
250 m_log.warn("unable to extract attributes, GSS name attribute inquiry failed (%u:%u)", major, minor);
254 void GSSAPIExtractorImpl::extractAttributes(
255 gss_name_t initiatorName, gss_buffer_t namingAttribute, vector<Attribute*>& attributes
258 // First we have to determine if this GSS attribute is something we recognize.
259 string attrname(reinterpret_cast<char*>(namingAttribute->value), namingAttribute->length);
260 map<string,Rule>::const_iterator rule = m_attrMap.find(attrname);
261 if (rule == m_attrMap.end()) {
262 m_log.info("skipping unmapped GSS-API attribute: %s", attrname.c_str());
266 vector<string> values;
268 OM_uint32 major,minor;
269 int authenticated=-1,more=-1;
271 gss_buffer_desc buf = GSS_C_EMPTY_BUFFER;
272 major = gss_get_name_attribute(
273 &minor, initiatorName, namingAttribute, &authenticated, nullptr, &buf, nullptr, &more
275 if (major == GSS_S_COMPLETE) {
276 if (rule->second.authenticated && !authenticated) {
277 m_log.warn("skipping unauthenticated GSS-API attribute: %s", attrname.c_str());
278 gss_release_buffer(&minor, &buf);
282 values.push_back(string(reinterpret_cast<char*>(buf.value), buf.length));
284 gss_release_buffer(&minor, &buf);
287 m_log.warn("error obtaining values for GSS-API attribute (%s): %u:%u", attrname.c_str(), major, minor);
289 } while (major == GSS_S_COMPLETE && more);
294 if (rule->second.scopeDelimiter && !rule->second.binary) {
295 auto_ptr<ScopedAttribute> scoped(new ScopedAttribute(rule->second.ids, rule->second.scopeDelimiter));
296 vector< pair<string,string> >& dest = scoped->getValues();
297 for (vector<string>::const_iterator v = values.begin(); v != values.end(); ++v) {
298 const char* value = v->c_str();
299 const char* scope = strchr(value, rule->second.scopeDelimiter);
302 dest.push_back(pair<string,string>(v->substr(0, scope-value), scope + 1));
304 m_log.warn("ignoring unscoped value");
307 m_log.warn("ignoring unscoped value");
310 if (!scoped->getValues().empty())
311 attributes.push_back(scoped.release());
313 else if (rule->second.binary) {
314 auto_ptr<BinaryAttribute> binary(new BinaryAttribute(rule->second.ids));
315 binary->getValues() = values;
316 attributes.push_back(binary.release());
319 auto_ptr<SimpleAttribute> simple(new SimpleAttribute(rule->second.ids));
320 simple->getValues() = values;
321 attributes.push_back(simple.release());
325 void GSSAPIExtractor::extractAttributes(
326 const Application& application, const RoleDescriptor* issuer, const XMLObject& xmlObject, vector<Attribute*>& attributes
332 static const XMLCh _GSSAPIContext[] = UNICODE_LITERAL_13(G,S,S,A,P,I,C,o,n,t,e,x,t);
333 static const XMLCh _GSSAPIName[] = UNICODE_LITERAL_10(G,S,S,A,P,I,N,a,m,e);
335 if (!XMLString::equals(xmlObject.getElementQName().getLocalPart(), _GSSAPIContext)
336 && !XMLString::equals(xmlObject.getElementQName().getLocalPart(), _GSSAPIName)
338 m_log.debug("unable to extract attributes, unknown XML object type: %s", xmlObject.getElementQName().toString().c_str());
342 const XMLCh* encodedWide = xmlObject.getTextContent();
343 if (!encodedWide || !*encodedWide) {
344 m_log.warn("unable to extract attributes, GSSAPI element had no text content");
349 OM_uint32 major,minor;
350 auto_ptr_char encoded(encodedWide);
353 gss_ctx_id_t gss = GSS_C_NO_CONTEXT;
355 XMLByte* decoded=Base64::decode(reinterpret_cast<const XMLByte*>(encoded.get()), &x);
357 gss_buffer_desc importbuf;
358 importbuf.length = x;
359 importbuf.value = decoded;
360 if (XMLString::equals(xmlObject.getElementQName().getLocalPart(), _GSSAPIName)) {
361 #ifdef HAVE_GSSAPI_COMPOSITE_NAME
362 major = gss_import_name(&minor, &importbuf, GSS_C_NT_EXPORT_NAME_COMPOSITE, &srcname);
364 major = gss_import_name(&minor, &importbuf, GSS_C_NT_EXPORT_NAME, &srcname);
366 if (major == GSS_S_COMPLETE) {
367 m_impl->extractAttributes(srcname, attributes);
368 gss_release_name(&minor, &srcname);
371 m_log.warn("unable to extract attributes, GSS name import failed (%u:%u)", major, minor);
373 // We fall through here down to the GSS context check, which will exit us.
376 major = gss_import_sec_context(&minor, &importbuf, &gss);
377 if (major != GSS_S_COMPLETE) {
378 m_log.warn("unable to extract attributes, GSS context import failed (%u:%u)", major, minor);
379 gss = GSS_C_NO_CONTEXT;
382 #ifdef SHIBSP_XERCESC_HAS_XMLBYTE_RELEASE
383 XMLString::release(&decoded);
385 XMLString::release((char**)&decoded);
389 m_log.warn("unable to extract attributes, base64 decode of GSSAPI context or name failed");
392 if (gss == GSS_C_NO_CONTEXT) {
396 // Extract the initiator name from the context.
397 major = gss_inquire_context(&minor, gss, &srcname, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr);
398 if (major == GSS_S_COMPLETE) {
399 m_impl->extractAttributes(srcname, attributes);
400 gss_release_name(&minor, &srcname);
403 m_log.warn("unable to extract attributes, GSS initiator name extraction failed (%u:%u)", major, minor);
406 gss_delete_sec_context(&minor, &gss, GSS_C_NO_BUFFER);
409 pair<bool,DOMElement*> GSSAPIExtractor::background_load()
411 // Load from source using base class.
412 pair<bool,DOMElement*> raw = ReloadableXMLFile::load();
414 // If we own it, wrap it.
415 XercesJanitor<DOMDocument> docjanitor(raw.first ? raw.second->getOwnerDocument() : nullptr);
417 GSSAPIExtractorImpl* impl = new GSSAPIExtractorImpl(raw.second, m_log);
419 // If we held the document, transfer it to the impl. If we didn't, it's a no-op.
420 impl->setDocument(docjanitor.release());
422 // Perform the swap inside a lock.
425 SharedLock locker(m_lock, false);
429 return make_pair(false,(DOMElement*)nullptr);