xmltooling/security/impl/FilesystemCredentialResolver.cpp

   1 /*
   2  *  Copyright 2001-2009 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  * FilesystemCredentialResolver.cpp
  19  *
  20  * Supplies credentials from local files.
  21  */
  22
  23 #include "internal.h"
  24 #include "logging.h"
  25 #include "security/BasicX509Credential.h"
  26 #include "security/CredentialCriteria.h"
  27 #include "security/CredentialResolver.h"
  28 #include "security/KeyInfoResolver.h"
  29 #include "security/OpenSSLCredential.h"
  30 #include "security/SecurityHelper.h"
  31 #include "security/XSECCryptoX509CRL.h"
  32 #include "util/NDC.h"
  33 #include "util/PathResolver.h"
  34 #include "util/Threads.h"
  35 #include "util/XMLHelper.h"
  36
  37 #include <memory>
  38 #include <algorithm>
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <openssl/pkcs12.h>
  42 #include <xercesc/util/XMLUniDefs.hpp>
  43 #include <xsec/enc/OpenSSL/OpenSSLCryptoX509.hpp>
  44
  45 using namespace xmlsignature;
  46 using namespace xmltooling::logging;
  47 using namespace xmltooling;
  48 using namespace std;
  49
  50 using xercesc::DOMElement;
  51 using xercesc::chLatin_f;
  52 using xercesc::chDigit_0;
  53
  54 namespace xmltooling {
  55
  56     // The ManagedResource classes handle memory management, loading of the files
  57     // and staleness detection. A copy of the active objects is always stored in
  58     // these instances.
  59
  60     class XMLTOOL_DLLLOCAL ManagedResource {
  61     protected:
  62         ManagedResource() : local(true), reloadChanges(true), filestamp(0), reloadInterval(0) {}
  63         ~ManagedResource() {}
  64
  65         SOAPTransport* getTransport() {
  66             SOAPTransport::Address addr("FilesystemCredentialResolver", source.c_str(), source.c_str());
  67             string scheme(addr.m_endpoint, strchr(addr.m_endpoint,':') - addr.m_endpoint);
  68             return XMLToolingConfig::getConfig().SOAPTransportManager.newPlugin(scheme.c_str(), addr);
  69         }
  70
  71     public:
  72         bool stale(Category& log, RWLock* lock=NULL) {
  73             if (local) {
  74 #ifdef WIN32
  75                 struct _stat stat_buf;
  76                 if (_stat(source.c_str(), &stat_buf) != 0)
  77                     return false;
  78 #else
  79                 struct stat stat_buf;
  80                 if (stat(source.c_str(), &stat_buf) != 0)
  81                     return false;
  82 #endif
  83                 if (filestamp >= stat_buf.st_mtime)
  84                     return false;
  85
  86                 // If necessary, elevate lock and recheck.
  87                 if (lock) {
  88                     log.debug("timestamp of local resource changed, elevating to a write lock");
  89                     lock->unlock();
  90                     lock->wrlock();
  91                     if (filestamp >= stat_buf.st_mtime) {
  92                         // Somebody else handled it, just downgrade.
  93                         log.debug("update of local resource handled by another thread, downgrading lock");
  94                         lock->unlock();
  95                         lock->rdlock();
  96                         return false;
  97                     }
  98                 }
  99
 100                 // Update the timestamp regardless. No point in repeatedly trying.
 101                 filestamp = stat_buf.st_mtime;
 102                 log.info("change detected, reloading local resource...");
 103             }
 104             else {
 105                 time_t now = time(NULL);
 106
 107                 // Time to reload?
 108                 if (now - filestamp < reloadInterval)
 109                     return false;
 110
 111                 // If necessary, elevate lock and recheck.
 112                 if (lock) {
 113                     log.debug("reload interval for remote resource elapsed, elevating to a write lock");
 114                     lock->unlock();
 115                     lock->wrlock();
 116                     if (now - filestamp < reloadInterval) {
 117                         // Somebody else handled it, just downgrade.
 118                         log.debug("update of remote resource handled by another thread, downgrading lock");
 119                         lock->unlock();
 120                         lock->rdlock();
 121                         return false;
 122                     }
 123                 }
 124
 125                 filestamp = now;
 126                 log.info("reloading remote resource...");
 127             }
 128             return true;
 129         }
 130
 131         bool local,reloadChanges;
 132         string format,source,backing;
 133         time_t filestamp,reloadInterval;
 134     };
 135
 136     class XMLTOOL_DLLLOCAL ManagedKey : public ManagedResource {
 137     public:
 138         ManagedKey() : key(NULL) {}
 139         ~ManagedKey() { delete key; }
 140         void load(Category& log, const char* password) {
 141             if (source.empty())
 142                 return;
 143             XSECCryptoKey* nkey=NULL;
 144             if (local) {
 145                 nkey = SecurityHelper::loadKeyFromFile(source.c_str(), format.c_str(), password);
 146             }
 147             else {
 148                 auto_ptr<SOAPTransport> t(getTransport());
 149                 log.info("loading private key from URL (%s)", source.c_str());
 150                 nkey = SecurityHelper::loadKeyFromURL(*t.get(), backing.c_str(), format.c_str(), password);
 151             }
 152             delete key;
 153             key = nkey;
 154             if (format.empty())
 155                 format = SecurityHelper::guessEncodingFormat(local ? source.c_str() : backing.c_str());
 156         }
 157
 158         XSECCryptoKey* key;
 159     };
 160
 161     class XMLTOOL_DLLLOCAL ManagedCert : public ManagedResource {
 162     public:
 163         ManagedCert() {}
 164         ~ManagedCert() { for_each(certs.begin(), certs.end(), xmltooling::cleanup<XSECCryptoX509>()); }
 165         void load(Category& log, const char* password) {
 166             if (source.empty())
 167                 return;
 168             vector<XSECCryptoX509*> ncerts;
 169             if (local) {
 170                 SecurityHelper::loadCertificatesFromFile(ncerts, source.c_str(), format.c_str(), password);
 171             }
 172             else {
 173                 auto_ptr<SOAPTransport> t(getTransport());
 174                 log.info("loading certificate(s) from URL (%s)", source.c_str());
 175                 SecurityHelper::loadCertificatesFromURL(ncerts, *t.get(), backing.c_str(), format.c_str(), password);
 176             }
 177             for_each(certs.begin(), certs.end(), xmltooling::cleanup<XSECCryptoX509>());
 178             certs = ncerts;
 179             if (format.empty())
 180                 format = SecurityHelper::guessEncodingFormat(local ? source.c_str() : backing.c_str());
 181         }
 182         vector<XSECCryptoX509*> certs;
 183     };
 184
 185     class XMLTOOL_DLLLOCAL ManagedCRL : public ManagedResource {
 186     public:
 187         ManagedCRL() {}
 188         ~ManagedCRL() { for_each(crls.begin(), crls.end(), xmltooling::cleanup<XSECCryptoX509CRL>()); }
 189         void load(Category& log) {
 190             if (source.empty())
 191                 return;
 192             vector<XSECCryptoX509CRL*> ncrls;
 193             if (local) {
 194                 SecurityHelper::loadCRLsFromFile(ncrls, source.c_str(), format.c_str());
 195             }
 196             else {
 197                 auto_ptr<SOAPTransport> t(getTransport());
 198                 log.info("loading CRL(s) from URL (%s)", source.c_str());
 199                 SecurityHelper::loadCRLsFromURL(ncrls, *t.get(), backing.c_str(), format.c_str());
 200             }
 201             for_each(crls.begin(), crls.end(), xmltooling::cleanup<XSECCryptoX509CRL>());
 202             crls = ncrls;
 203             if (format.empty())
 204                 format = SecurityHelper::guessEncodingFormat(local ? source.c_str() : backing.c_str());
 205         }
 206         vector<XSECCryptoX509CRL*> crls;
 207     };
 208
 209     class XMLTOOL_DLLLOCAL FilesystemCredential;
 210     class XMLTOOL_DLLLOCAL FilesystemCredentialResolver : public CredentialResolver
 211     {
 212         friend class XMLTOOL_DLLLOCAL FilesystemCredential;
 213     public:
 214         FilesystemCredentialResolver(const DOMElement* e);
 215         virtual ~FilesystemCredentialResolver();
 216
 217         Lockable* lock();
 218         void unlock() {
 219             m_lock->unlock();
 220         }
 221
 222         const Credential* resolve(const CredentialCriteria* criteria=NULL) const;
 223
 224         virtual vector<const Credential*>::size_type resolve(
 225             vector<const Credential*>& results, const CredentialCriteria* criteria=NULL
 226             ) const;
 227
 228     private:
 229         Credential* getCredential();
 230
 231         RWLock* m_lock;
 232         Credential* m_credential;
 233         string m_keypass,m_certpass;
 234         unsigned int m_keyinfomask,m_usage;
 235         vector<string> m_keynames;
 236
 237         ManagedKey m_key;
 238         vector<ManagedCert> m_certs;
 239         vector<ManagedCRL> m_crls;
 240     };
 241
 242 #if defined (_MSC_VER)
 243     #pragma warning( push )
 244     #pragma warning( disable : 4250 )
 245 #endif
 246
 247     class XMLTOOL_DLLLOCAL FilesystemCredential : public OpenSSLCredential, public BasicX509Credential
 248     {
 249     public:
 250         FilesystemCredential(
 251             FilesystemCredentialResolver* resolver, XSECCryptoKey* key, const vector<XSECCryptoX509*>& xseccerts, const vector<XSECCryptoX509CRL*>& crls
 252             ) : BasicX509Credential(key ? key : (xseccerts.empty() ? NULL : xseccerts.front()->clonePublicKey()), xseccerts, crls), m_resolver(resolver) {
 253             extract();
 254             m_keyNames.insert(m_resolver->m_keynames.begin(), m_resolver->m_keynames.end());
 255         }
 256
 257         virtual ~FilesystemCredential() {
 258         }
 259
 260         unsigned int getUsage() const {
 261             return m_resolver->m_usage;
 262         }
 263
 264         void initKeyInfo(unsigned int types=0) {
 265             BasicX509Credential::initKeyInfo(types);
 266         }
 267
 268         void attach(SSL_CTX* ctx) const;
 269
 270     private:
 271         FilesystemCredentialResolver* m_resolver;
 272     };
 273
 274 #if defined (_MSC_VER)
 275     #pragma warning( pop )
 276 #endif
 277
 278     CredentialResolver* XMLTOOL_DLLLOCAL FilesystemCredentialResolverFactory(const DOMElement* const & e)
 279     {
 280         return new FilesystemCredentialResolver(e);
 281     }
 282
 283     static const XMLCh backingFilePath[] =  UNICODE_LITERAL_15(b,a,c,k,i,n,g,F,i,l,e,P,a,t,h);
 284     static const XMLCh _CredentialResolver[] = UNICODE_LITERAL_18(C,r,e,d,e,n,t,i,a,l,R,e,s,o,l,v,e,r);
 285     static const XMLCh CAPath[] =           UNICODE_LITERAL_6(C,A,P,a,t,h);
 286     static const XMLCh Certificate[] =      UNICODE_LITERAL_11(C,e,r,t,i,f,i,c,a,t,e);
 287     static const XMLCh _certificate[] =     UNICODE_LITERAL_11(c,e,r,t,i,f,i,c,a,t,e);
 288     static const XMLCh CRL[] =              UNICODE_LITERAL_3(C,R,L);
 289     static const XMLCh _format[] =          UNICODE_LITERAL_6(f,o,r,m,a,t);
 290     static const XMLCh Key[] =              UNICODE_LITERAL_3(K,e,y);
 291     static const XMLCh _key[] =             UNICODE_LITERAL_3(k,e,y);
 292     static const XMLCh keyInfoMask[] =      UNICODE_LITERAL_11(k,e,y,I,n,f,o,M,a,s,k);
 293     static const XMLCh keyName[] =          UNICODE_LITERAL_7(k,e,y,N,a,m,e);
 294     static const XMLCh Name[] =             UNICODE_LITERAL_4(N,a,m,e);
 295     static const XMLCh password[] =         UNICODE_LITERAL_8(p,a,s,s,w,o,r,d);
 296     static const XMLCh Path[] =             UNICODE_LITERAL_4(P,a,t,h);
 297     static const XMLCh _reloadChanges[] =   UNICODE_LITERAL_13(r,e,l,o,a,d,C,h,a,n,g,e,s);
 298     static const XMLCh _reloadInterval[] =  UNICODE_LITERAL_14(r,e,l,o,a,d,I,n,t,e,r,v,a,l);
 299     static const XMLCh _URL[] =             UNICODE_LITERAL_3(U,R,L);
 300     static const XMLCh _use[] =             UNICODE_LITERAL_3(u,s,e);
 301 };
 302
 303 FilesystemCredentialResolver::FilesystemCredentialResolver(const DOMElement* e)
 304     : m_lock(NULL), m_credential(NULL), m_usage(Credential::UNSPECIFIED_CREDENTIAL)
 305 {
 306 #ifdef _DEBUG
 307     NDC ndc("FilesystemCredentialResolver");
 308 #endif
 309     Category& log=Category::getInstance(XMLTOOLING_LOGCAT".CredentialResolver."FILESYSTEM_CREDENTIAL_RESOLVER);
 310
 311     // Default to disable X509IssuerSerial due to schema validation issues.
 312     m_keyinfomask =
 313         Credential::KEYINFO_KEY_NAME |
 314         Credential::KEYINFO_KEY_VALUE |
 315         X509Credential::KEYINFO_X509_CERTIFICATE |
 316         X509Credential::KEYINFO_X509_SUBJECTNAME;
 317     if (e && e->hasAttributeNS(NULL,keyInfoMask))
 318         m_keyinfomask = XMLString::parseInt(e->getAttributeNS(NULL,keyInfoMask));
 319
 320     if (e && (e->hasAttributeNS(NULL,_certificate) || e->hasAttributeNS(NULL,_key))) {
 321         // Dummy up a simple file resolver config using these attributes.
 322         DOMElement* dummy = e->getOwnerDocument()->createElementNS(NULL,_CredentialResolver);
 323         DOMElement* child;
 324         DOMElement* path;
 325         if (e->hasAttributeNS(NULL,_key)) {
 326             child = e->getOwnerDocument()->createElementNS(NULL,Key);
 327             dummy->appendChild(child);
 328             path = e->getOwnerDocument()->createElementNS(NULL,Path);
 329             child->appendChild(path);
 330             path->appendChild(e->getOwnerDocument()->createTextNode(e->getAttributeNS(NULL,_key)));
 331             if (e->hasAttributeNS(NULL,password))
 332                 child->setAttributeNS(NULL,password,e->getAttributeNS(NULL,password));
 333             if (e->hasAttributeNS(NULL,keyName)) {
 334                 path = e->getOwnerDocument()->createElementNS(NULL,Name);
 335                 child->appendChild(path);
 336                 path->appendChild(e->getOwnerDocument()->createTextNode(e->getAttributeNS(NULL,keyName)));
 337             }
 338         }
 339         if (e->hasAttributeNS(NULL,_certificate)) {
 340             child = e->getOwnerDocument()->createElementNS(NULL,Certificate);
 341             dummy->appendChild(child);
 342             path = e->getOwnerDocument()->createElementNS(NULL,Path);
 343             child->appendChild(path);
 344             path->appendChild(e->getOwnerDocument()->createTextNode(e->getAttributeNS(NULL,_certificate)));
 345         }
 346         e = dummy;  // reset "root" to the dummy config element
 347     }
 348
 349     const XMLCh* prop;
 350     const DOMElement* root = e;
 351
 352     // Save off usage flags.
 353     const XMLCh* usage = root->getAttributeNS(NULL,_use);
 354     if (usage && *usage) {
 355         auto_ptr_char u(usage);
 356         if (!strcmp(u.get(), "signing"))
 357             m_usage = Credential::SIGNING_CREDENTIAL | Credential::TLS_CREDENTIAL;
 358         else if (!strcmp(u.get(), "TLS"))
 359             m_usage = Credential::TLS_CREDENTIAL;
 360         else if (!strcmp(u.get(), "encryption"))
 361             m_usage = Credential::ENCRYPTION_CREDENTIAL;
 362     }
 363
 364     // Move to Key.
 365     const DOMElement* keynode = XMLHelper::getFirstChildElement(root,Key);
 366     if (keynode) {
 367         prop = keynode->getAttributeNS(NULL,_format);
 368         if (prop && *prop) {
 369             auto_ptr_char f(prop);
 370             m_key.format = f.get();
 371         }
 372
 373         prop = keynode->getAttributeNS(NULL,password);
 374         if (prop && *prop) {
 375             auto_ptr_char kp(prop);
 376             m_keypass = kp.get();
 377         }
 378
 379         if ((e=XMLHelper::getFirstChildElement(keynode,Path)) && e->hasChildNodes()) {
 380             prop = e->getFirstChild()->getNodeValue();
 381             auto_ptr_char kpath(prop);
 382             m_key.source = kpath.get();
 383             XMLToolingConfig::getConfig().getPathResolver()->resolve(m_key.source, PathResolver::XMLTOOLING_CFG_FILE);
 384             m_key.local = true;
 385             prop = e->getAttributeNS(NULL,_reloadChanges);
 386             if (prop && (*prop==chLatin_f) || (*prop==chDigit_0))
 387                 m_key.reloadChanges = false;
 388         }
 389         else if ((e=XMLHelper::getFirstChildElement(keynode,_URL)) && e->hasChildNodes()) {
 390             prop = e->getFirstChild()->getNodeValue();
 391             auto_ptr_char kpath(prop);
 392             m_key.source = kpath.get();
 393             m_key.local = false;
 394             prop = e->getAttributeNS(NULL,backingFilePath);
 395             if (!prop || !*prop)
 396                 throw XMLSecurityException("FilesystemCredentialResolver can't access key, backingFilePath missing from URL element.");
 397             auto_ptr_char b(prop);
 398             m_key.backing = b.get();
 399             XMLToolingConfig::getConfig().getPathResolver()->resolve(m_key.backing, PathResolver::XMLTOOLING_RUN_FILE);
 400             prop = e->getAttributeNS(NULL,_reloadInterval);
 401             if (prop && *prop)
 402                 m_key.reloadInterval = XMLString::parseInt(prop);
 403         }
 404         else {
 405             log.error("Path/URL element missing inside Key element");
 406             throw XMLSecurityException("FilesystemCredentialResolver can't access key, no Path or URL element specified.");
 407         }
 408
 409         e = XMLHelper::getFirstChildElement(keynode, Name);
 410         while (e) {
 411             if (e->hasChildNodes()) {
 412                 auto_ptr_char n(e->getFirstChild()->getNodeValue());
 413                 if (n.get() && *n.get())
 414                     m_keynames.push_back(n.get());
 415             }
 416             e = XMLHelper::getNextSiblingElement(e, Name);
 417         }
 418     }
 419
 420     // Check for CRL.
 421     const DOMElement* crlnode = XMLHelper::getFirstChildElement(root,CRL);
 422     if (crlnode) {
 423         const XMLCh* crlformat = crlnode->getAttributeNS(NULL,_format);
 424         e = XMLHelper::getFirstChildElement(crlnode,Path);
 425         while (e) {
 426             if (e->hasChildNodes()) {
 427                 m_crls.push_back(ManagedCRL());
 428                 ManagedResource& crl = m_crls.back();
 429                 if (crlformat && *crlformat) {
 430                     auto_ptr_char f(crlformat);
 431                     crl.format = f.get();
 432                 }
 433                 prop = e->getFirstChild()->getNodeValue();
 434                 auto_ptr_char crlpath(prop);
 435                 crl.source = crlpath.get();
 436                 XMLToolingConfig::getConfig().getPathResolver()->resolve(crl.source, PathResolver::XMLTOOLING_CFG_FILE);
 437                 crl.local = true;
 438                 prop = e->getAttributeNS(NULL,_reloadChanges);
 439                 if (prop && (*prop==chLatin_f) || (*prop==chDigit_0))
 440                     crl.reloadChanges = false;
 441             }
 442             e = XMLHelper::getNextSiblingElement(e,Path);
 443         }
 444
 445         e=XMLHelper::getFirstChildElement(crlnode,_URL);
 446         while (e) {
 447             if (e->hasChildNodes()) {
 448                 m_crls.push_back(ManagedCRL());
 449                 ManagedResource& crl = m_crls.back();
 450                 if (crlformat && *crlformat) {
 451                     auto_ptr_char f(crlformat);
 452                     crl.format = f.get();
 453                 }
 454                 prop = e->getFirstChild()->getNodeValue();
 455                 auto_ptr_char crlpath(prop);
 456                 crl.source = crlpath.get();
 457                 crl.local = false;
 458                 prop = e->getAttributeNS(NULL,backingFilePath);
 459                 if (!prop || !*prop)
 460                     throw XMLSecurityException("FilesystemCredentialResolver can't access CRL, backingFilePath missing from URL element.");
 461                 auto_ptr_char b(prop);
 462                 crl.backing = b.get();
 463                 XMLToolingConfig::getConfig().getPathResolver()->resolve(crl.backing, PathResolver::XMLTOOLING_RUN_FILE);
 464                 prop = e->getAttributeNS(NULL,_reloadInterval);
 465                 if (prop && *prop)
 466                     crl.reloadInterval = XMLString::parseInt(prop);
 467             }
 468             e = XMLHelper::getNextSiblingElement(e,_URL);
 469         }
 470         if (m_crls.empty()) {
 471             log.error("Path/URL element missing inside CRL element");
 472             throw XMLSecurityException("FilesystemCredentialResolver can't access CRL, no Path or URL element specified.");
 473         }
 474     }
 475
 476     // Check for Certificate
 477     DOMElement* certnode = XMLHelper::getFirstChildElement(root,Certificate);
 478     if (certnode) {
 479         prop = certnode->getAttributeNS(NULL,password);
 480         if (prop && *prop) {
 481             auto_ptr_char certpass(prop);
 482             m_certpass = certpass.get();
 483         }
 484
 485         const XMLCh* certformat = certnode->getAttributeNS(NULL,_format);
 486
 487         e = XMLHelper::getFirstChildElement(certnode);
 488         while (e) {
 489             if (e->hasChildNodes() && (XMLString::equals(e->getLocalName(), Path) || XMLString::equals(e->getLocalName(), CAPath))) {
 490                 m_certs.push_back(ManagedCert());
 491                 ManagedResource& cert = m_certs.back();
 492                 if (certformat && *certformat) {
 493                     auto_ptr_char f(certformat);
 494                     cert.format = f.get();
 495                 }
 496                 prop = e->getFirstChild()->getNodeValue();
 497                 auto_ptr_char certpath(prop);
 498                 cert.source = certpath.get();
 499                 XMLToolingConfig::getConfig().getPathResolver()->resolve(cert.source, PathResolver::XMLTOOLING_CFG_FILE);
 500                 cert.local = true;
 501                 prop = e->getAttributeNS(NULL,_reloadChanges);
 502                 if (prop && (*prop==chLatin_f) || (*prop==chDigit_0))
 503                     cert.reloadChanges = false;
 504             }
 505             else if (e->hasChildNodes() && XMLString::equals(e->getLocalName(), _URL)) {
 506                 m_certs.push_back(ManagedCert());
 507                 ManagedResource& cert = m_certs.back();
 508                 if (certformat && *certformat) {
 509                     auto_ptr_char f(certformat);
 510                     cert.format = f.get();
 511                 }
 512                 prop = e->getFirstChild()->getNodeValue();
 513                 auto_ptr_char certpath(prop);
 514                 cert.source = certpath.get();
 515                 cert.local = false;
 516                 prop = e->getAttributeNS(NULL,backingFilePath);
 517                 if (!prop || !*prop)
 518                     throw XMLSecurityException("FilesystemCredentialResolver can't access certificate, backingFilePath missing from URL element.");
 519                 auto_ptr_char b(prop);
 520                 cert.backing = b.get();
 521                 XMLToolingConfig::getConfig().getPathResolver()->resolve(cert.backing, PathResolver::XMLTOOLING_RUN_FILE);
 522                 prop = e->getAttributeNS(NULL,_reloadInterval);
 523                 if (prop && *prop)
 524                     cert.reloadInterval = XMLString::parseInt(prop);
 525             }
 526             e = XMLHelper::getNextSiblingElement(e);
 527         }
 528         if (m_certs.empty()) {
 529             log.error("Path/URL element missing inside Certificate element");
 530             throw XMLSecurityException("FilesystemCredentialResolver can't access certificate, no Path or URL element specified.");
 531         }
 532     }
 533
 534     // Do an initial load of all the objects. If anything blows up here, whatever's
 535     // been loaded should be freed during teardown of the embedded objects.
 536     time_t now = time(NULL);
 537     m_key.filestamp = now;
 538     m_key.load(log, m_keypass.c_str());
 539     for (vector<ManagedCert>::iterator i = m_certs.begin(); i != m_certs.end(); ++i) {
 540         i->load(log, (i==m_certs.begin()) ? m_certpass.c_str() : NULL);
 541         i->filestamp = now;
 542     }
 543     for (vector<ManagedCRL>::iterator j = m_crls.begin(); j != m_crls.end(); ++j) {
 544         j->load(log);
 545         j->filestamp = now;
 546     }
 547
 548     // Load it all into a credential object and then create the lock.
 549     auto_ptr<Credential> credential(getCredential());
 550     m_lock = RWLock::create();
 551     m_credential = credential.release();
 552 }
 553
 554 FilesystemCredentialResolver::~FilesystemCredentialResolver()
 555 {
 556     delete m_credential;
 557     delete m_lock;
 558 }
 559
 560 Credential* FilesystemCredentialResolver::getCredential()
 561 {
 562     // First, verify that the key and certificate match.
 563     if (m_key.key && !m_certs.empty()) {
 564         auto_ptr<XSECCryptoKey> temp(m_certs.front().certs.front()->clonePublicKey());
 565         if (!SecurityHelper::matches(*m_key.key, *temp.get()))
 566             throw XMLSecurityException("FilesystemCredentialResolver given mismatched key/certificate, check for consistency.");
 567     }
 568
 569     // We (unfortunately) need to duplicate all the objects and put them in one set of arrays
 570     // in order to create the credential wrapper.
 571     FilesystemCredential* credential=NULL;
 572     auto_ptr<XSECCryptoKey> xseckey(m_key.key ? m_key.key->clone() : NULL);
 573     vector<XSECCryptoX509*> xseccerts;
 574     vector<XSECCryptoX509CRL*> xseccrls;
 575     try {
 576         for (vector<ManagedCert>::iterator i = m_certs.begin(); i != m_certs.end(); ++i) {
 577             for (vector<XSECCryptoX509*>::const_iterator y = i->certs.begin(); y != i->certs.end(); ++y)
 578                 xseccerts.push_back(new OpenSSLCryptoX509(static_cast<OpenSSLCryptoX509*>(*y)->getOpenSSLX509()));
 579         }
 580         for (vector<ManagedCRL>::iterator j = m_crls.begin(); j != m_crls.end(); ++j) {
 581             for (vector<XSECCryptoX509CRL*>::const_iterator z = j->crls.begin(); z != j->crls.end(); ++z)
 582                 xseccrls.push_back((*z)->clone());
 583         }
 584         credential = new FilesystemCredential(this, xseckey.get(), xseccerts, xseccrls);
 585         xseckey.release();
 586     }
 587     catch (exception&) {
 588         for_each(xseccerts.begin(), xseccerts.end(), xmltooling::cleanup<XSECCryptoX509>());
 589         for_each(xseccrls.begin(), xseccrls.end(), xmltooling::cleanup<XSECCryptoX509CRL>());
 590         throw;
 591     }
 592
 593     // At this point the copies are owned by the credential.
 594     try {
 595         credential->initKeyInfo(m_keyinfomask);
 596     }
 597     catch (exception&) {
 598         delete credential;
 599         throw;
 600     }
 601
 602     return credential;
 603 }
 604
 605 Lockable* FilesystemCredentialResolver::lock()
 606 {
 607 #ifdef _DEBUG
 608     NDC ndc("lock");
 609 #endif
 610     Category& log=Category::getInstance(XMLTOOLING_LOGCAT".CredentialResolver."FILESYSTEM_CREDENTIAL_RESOLVER);
 611
 612     m_lock->rdlock();
 613
 614     // Check each managed resource while holding a read lock for staleness.
 615     // If it comes back false, the lock is left as is, and the resource was stable.
 616     // If it comes back true, the lock was elevated to a write lock, and the resource
 617     // needs to be reloaded, and the credential replaced.
 618     // Once a stale check comes back true, further checks leave the lock alone.
 619
 620     bool writelock = false, updated = false;
 621
 622     if (m_key.stale(log, m_lock)) {
 623         writelock = true;
 624         try {
 625             m_key.load(log, m_keypass.c_str());
 626             updated = true;
 627         }
 628         catch (exception& ex) {
 629             log.crit("maintaining existing key: %s", ex.what());
 630         }
 631     }
 632
 633     for (vector<ManagedCert>::iterator i = m_certs.begin(); i != m_certs.end(); ++i) {
 634         if (i->stale(log, writelock ? NULL : m_lock)) {
 635             writelock = true;
 636             try {
 637                 i->load(log, (i==m_certs.begin()) ? m_certpass.c_str() : NULL);
 638                 updated = true;
 639             }
 640             catch (exception& ex) {
 641                 log.crit("maintaining existing certificate(s): %s", ex.what());
 642             }
 643         }
 644     }
 645
 646     for (vector<ManagedCRL>::iterator j = m_crls.begin(); j != m_crls.end(); ++j) {
 647         if (j->stale(log, writelock ? NULL : m_lock)) {
 648             writelock = true;
 649             try {
 650                 j->load(log);
 651                 updated = true;
 652             }
 653             catch (exception& ex) {
 654                 log.crit("maintaining existing CRL(s): %s", ex.what());
 655             }
 656         }
 657     }
 658
 659     if (updated) {
 660         try {
 661             auto_ptr<Credential> credential(getCredential());
 662             delete m_credential;
 663             m_credential = credential.release();
 664         }
 665         catch (exception& ex) {
 666             log.crit("maintaining existing credentials, error reloading: %s", ex.what());
 667         }
 668     }
 669
 670     if (writelock) {
 671         m_lock->unlock();
 672         m_lock->rdlock();
 673     }
 674     return this;
 675 }
 676
 677 const Credential* FilesystemCredentialResolver::resolve(const CredentialCriteria* criteria) const
 678 {
 679     return (criteria ? (criteria->matches(*m_credential) ? m_credential : NULL) : m_credential);
 680 }
 681
 682 vector<const Credential*>::size_type FilesystemCredentialResolver::resolve(
 683     vector<const Credential*>& results, const CredentialCriteria* criteria
 684     ) const
 685 {
 686     if (!criteria || criteria->matches(*m_credential)) {
 687         results.push_back(m_credential);
 688         return 1;
 689     }
 690     return 0;
 691 }
 692
 693 // OpenSSL password callback...
 694 static int passwd_callback(char* buf, int len, int verify, void* passwd)
 695 {
 696     if(!verify)
 697     {
 698         if(passwd && len > strlen(reinterpret_cast<char*>(passwd)))
 699         {
 700             strcpy(buf,reinterpret_cast<char*>(passwd));
 701             return strlen(buf);
 702         }
 703     }
 704     return 0;
 705 }
 706
 707 void FilesystemCredential::attach(SSL_CTX* ctx) const
 708 {
 709 #ifdef _DEBUG
 710     NDC ndc("attach");
 711 #endif
 712
 713     int ret=0;
 714     const char* path = m_resolver->m_key.local ? m_resolver->m_key.source.c_str() : m_resolver->m_key.backing.c_str();
 715     if (!path || !*path)
 716         throw XMLSecurityException("No key available, unable to attach private key to SSL context.");
 717
 718     if (!m_resolver->m_keypass.empty()) {
 719         SSL_CTX_set_default_passwd_cb(ctx, passwd_callback);
 720         SSL_CTX_set_default_passwd_cb_userdata(ctx, const_cast<char*>(m_resolver->m_keypass.c_str()));
 721     }
 722
 723     if (m_resolver->m_key.format == "PEM") {
 724         ret=SSL_CTX_use_PrivateKey_file(ctx, path, SSL_FILETYPE_PEM);
 725     }
 726     else if (m_resolver->m_key.format == "DER") {
 727         ret=SSL_CTX_use_RSAPrivateKey_file(ctx, path, SSL_FILETYPE_ASN1);
 728     }
 729     else if (m_resolver->m_key.format == "PKCS12") {
 730         BIO* in=BIO_new(BIO_s_file_internal());
 731         if (in && BIO_read_filename(in,path)>0) {
 732             PKCS12* p12 = d2i_PKCS12_bio(in, NULL);
 733             if (p12) {
 734                 EVP_PKEY* pkey=NULL;
 735                 X509* x=NULL;
 736                 PKCS12_parse(p12, const_cast<char*>(m_resolver->m_keypass.c_str()), &pkey, &x, NULL);
 737                 PKCS12_free(p12);
 738                 if (x)
 739                     X509_free(x);
 740                 if (pkey) {
 741                     ret=SSL_CTX_use_PrivateKey(ctx, pkey);
 742                     EVP_PKEY_free(pkey);
 743                 }
 744             }
 745         }
 746         if (in)
 747             BIO_free(in);
 748     }
 749
 750     if (ret!=1) {
 751         log_openssl();
 752         throw XMLSecurityException("Unable to attach private key to SSL context.");
 753     }
 754
 755     // Attach certs.
 756     for (vector<XSECCryptoX509*>::const_iterator i=m_xseccerts.begin(); i!=m_xseccerts.end(); i++) {
 757         if (i==m_xseccerts.begin()) {
 758             if (SSL_CTX_use_certificate(ctx, static_cast<OpenSSLCryptoX509*>(*i)->getOpenSSLX509()) != 1) {
 759                 log_openssl();
 760                 throw XMLSecurityException("Unable to attach client certificate to SSL context.");
 761             }
 762         }
 763         else {
 764             // When we add certs, they don't get ref counted, so we need to duplicate them.
 765             X509* dup = X509_dup(static_cast<OpenSSLCryptoX509*>(*i)->getOpenSSLX509());
 766             if (SSL_CTX_add_extra_chain_cert(ctx, dup) != 1) {
 767                 X509_free(dup);
 768                 log_openssl();
 769                 throw XMLSecurityException("Unable to attach CA certificate to SSL context.");
 770             }
 771         }
 772     }
 773 }