xmltooling/security/impl/FilesystemCredentialResolver.cpp

   1 /*
   2  *  Copyright 2001-2007 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/OpenSSLCryptoX509CRL.h"
  31 #include "util/NDC.h"
  32 #include "util/PathResolver.h"
  33 #include "util/XMLHelper.h"
  34
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <openssl/pkcs12.h>
  38 #include <xercesc/util/XMLUniDefs.hpp>
  39 #include <xsec/enc/OpenSSL/OpenSSLCryptoX509.hpp>
  40 #include <xsec/enc/OpenSSL/OpenSSLCryptoKeyRSA.hpp>
  41 #include <xsec/enc/OpenSSL/OpenSSLCryptoKeyDSA.hpp>
  42
  43 using namespace xmlsignature;
  44 using namespace xmltooling::logging;
  45 using namespace xmltooling;
  46 using namespace std;
  47
  48 // OpenSSL password callback...
  49 static int passwd_callback(char* buf, int len, int verify, void* passwd)
  50 {
  51     if(!verify)
  52     {
  53         if(passwd && len > strlen(reinterpret_cast<char*>(passwd)))
  54         {
  55             strcpy(buf,reinterpret_cast<char*>(passwd));
  56             return strlen(buf);
  57         }
  58     }
  59     return 0;
  60 }
  61
  62 namespace xmltooling {
  63
  64 #if defined (_MSC_VER)
  65     #pragma warning( push )
  66     #pragma warning( disable : 4250 )
  67 #endif
  68
  69     class XMLTOOL_DLLLOCAL FilesystemCredentialResolver;
  70     class XMLTOOL_DLLLOCAL FilesystemCredential : public OpenSSLCredential, public BasicX509Credential
  71     {
  72     public:
  73         FilesystemCredential(
  74             FilesystemCredentialResolver* resolver, XSECCryptoKey* key, const std::vector<XSECCryptoX509*>& xseccerts, XSECCryptoX509CRL* crl=NULL
  75             ) : BasicX509Credential(key, xseccerts, crl), m_resolver(resolver), m_usage(UNSPECIFIED_CREDENTIAL) {
  76             extract();
  77         }
  78         virtual ~FilesystemCredential() {
  79         }
  80
  81         unsigned int getUsage() const {
  82             return m_usage;
  83         }
  84
  85         void setUsage(const XMLCh* usage) {
  86             if (usage && *usage) {
  87                 auto_ptr_char u(usage);
  88                 if (!strcmp(u.get(), "signing"))
  89                     m_usage = SIGNING_CREDENTIAL | TLS_CREDENTIAL;
  90                 else if (!strcmp(u.get(), "TLS"))
  91                     m_usage = TLS_CREDENTIAL;
  92                 else if (!strcmp(u.get(), "encryption"))
  93                     m_usage = ENCRYPTION_CREDENTIAL;
  94             }
  95         }
  96
  97         void addKeyNames(const DOMElement* e);
  98
  99         void initKeyInfo() {
 100             BasicX509Credential::initKeyInfo();
 101         }
 102
 103         void attach(SSL_CTX* ctx) const;
 104
 105     private:
 106         FilesystemCredentialResolver* m_resolver;
 107         unsigned int m_usage;
 108     };
 109
 110 #if defined (_MSC_VER)
 111     #pragma warning( pop )
 112 #endif
 113
 114     class XMLTOOL_DLLLOCAL FilesystemCredentialResolver : public CredentialResolver
 115     {
 116     public:
 117         FilesystemCredentialResolver(const DOMElement* e);
 118         virtual ~FilesystemCredentialResolver() {
 119             delete m_credential;
 120             for_each(m_certs.begin(),m_certs.end(),X509_free);
 121         }
 122
 123         Lockable* lock() { return this; }
 124         void unlock() {}
 125
 126         const Credential* resolve(const CredentialCriteria* criteria=NULL) const {
 127             return (criteria ? (criteria->matches(*m_credential) ? m_credential : NULL) : m_credential);
 128         }
 129
 130         virtual vector<const Credential*>::size_type resolve(
 131             vector<const Credential*>& results, const CredentialCriteria* criteria=NULL
 132             ) const {
 133             if (!criteria || criteria->matches(*m_credential)) {
 134                 results.push_back(m_credential);
 135                 return 1;
 136             }
 137             return 0;
 138         }
 139
 140         void attach(SSL_CTX* ctx) const;
 141
 142     private:
 143         XSECCryptoKey* loadKey();
 144         XSECCryptoX509CRL* loadCRL();
 145
 146         enum format_t { PEM=SSL_FILETYPE_PEM, DER=SSL_FILETYPE_ASN1, _PKCS12, UNKNOWN };
 147
 148         format_t getEncodingFormat(BIO* in) const;
 149         string formatToString(format_t format) const;
 150         format_t xmlFormatToFormat(const XMLCh* format_xml) const;
 151
 152         format_t m_keyformat,m_crlformat;
 153         string m_keypath,m_keypass,m_crlpath;
 154         vector<X509*> m_certs;
 155         FilesystemCredential* m_credential;
 156     };
 157
 158     CredentialResolver* XMLTOOL_DLLLOCAL FilesystemCredentialResolverFactory(const DOMElement* const & e)
 159     {
 160         return new FilesystemCredentialResolver(e);
 161     }
 162
 163     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);
 164     static const XMLCh CAPath[] =           UNICODE_LITERAL_6(C,A,P,a,t,h);
 165     static const XMLCh Certificate[] =      UNICODE_LITERAL_11(C,e,r,t,i,f,i,c,a,t,e);
 166     static const XMLCh _certificate[] =     UNICODE_LITERAL_11(c,e,r,t,i,f,i,c,a,t,e);
 167     static const XMLCh CRL[] =              UNICODE_LITERAL_3(C,R,L);
 168     static const XMLCh format[] =           UNICODE_LITERAL_6(f,o,r,m,a,t);
 169     static const XMLCh Key[] =              UNICODE_LITERAL_3(K,e,y);
 170     static const XMLCh _key[] =             UNICODE_LITERAL_3(k,e,y);
 171     static const XMLCh keyName[] =          UNICODE_LITERAL_7(k,e,y,N,a,m,e);
 172     static const XMLCh Name[] =             UNICODE_LITERAL_4(N,a,m,e);
 173     static const XMLCh password[] =         UNICODE_LITERAL_8(p,a,s,s,w,o,r,d);
 174     static const XMLCh Path[] =             UNICODE_LITERAL_4(P,a,t,h);
 175     static const XMLCh _use[] =             UNICODE_LITERAL_3(u,s,e);
 176 };
 177
 178 FilesystemCredentialResolver::FilesystemCredentialResolver(const DOMElement* e) : m_credential(NULL)
 179 {
 180 #ifdef _DEBUG
 181     NDC ndc("FilesystemCredentialResolver");
 182 #endif
 183     Category& log=Category::getInstance(XMLTOOLING_LOGCAT".CredentialResolver."FILESYSTEM_CREDENTIAL_RESOLVER);
 184
 185     if (e && (e->hasAttributeNS(NULL,_certificate) || e->hasAttributeNS(NULL,_key))) {
 186         // Dummy up a simple file resolver config using these attributes.
 187         DOMElement* dummy = e->getOwnerDocument()->createElementNS(NULL,_CredentialResolver);
 188         DOMElement* child;
 189         DOMElement* path;
 190         if (e->hasAttributeNS(NULL,_key)) {
 191             child = e->getOwnerDocument()->createElementNS(NULL,Key);
 192             dummy->appendChild(child);
 193             path = e->getOwnerDocument()->createElementNS(NULL,Path);
 194             child->appendChild(path);
 195             path->appendChild(e->getOwnerDocument()->createTextNode(e->getAttributeNS(NULL,_key)));
 196             if (e->hasAttributeNS(NULL,password))
 197                 child->setAttributeNS(NULL,password,e->getAttributeNS(NULL,password));
 198             if (e->hasAttributeNS(NULL,keyName)) {
 199                 path = e->getOwnerDocument()->createElementNS(NULL,Name);
 200                 child->appendChild(path);
 201                 path->appendChild(e->getOwnerDocument()->createTextNode(e->getAttributeNS(NULL,keyName)));
 202             }
 203         }
 204         if (e->hasAttributeNS(NULL,_certificate)) {
 205             child = e->getOwnerDocument()->createElementNS(NULL,Certificate);
 206             dummy->appendChild(child);
 207             path = e->getOwnerDocument()->createElementNS(NULL,Path);
 208             child->appendChild(path);
 209             path->appendChild(e->getOwnerDocument()->createTextNode(e->getAttributeNS(NULL,_certificate)));
 210         }
 211         e = dummy;  // reset "root" to the dummy config element
 212     }
 213
 214     const DOMElement* root=e;
 215     const XMLCh* usage = root->getAttributeNS(NULL,_use);
 216
 217     XSECCryptoKey* key=NULL;
 218     vector<XSECCryptoX509*> xseccerts;
 219     XSECCryptoX509CRL* crl=NULL;
 220
 221     format_t fformat;
 222     const XMLCh* format_xml=NULL;
 223     BIO* in = NULL;
 224
 225     // Move to Key
 226     const DOMElement* keynode=XMLHelper::getFirstChildElement(root,Key);
 227     if (keynode) {
 228         // Get raw format attrib value, but defer processing til later since may need to
 229         // determine format dynamically, and we need the Path for that.
 230         format_xml=keynode->getAttributeNS(NULL,format);
 231
 232         const XMLCh* password_xml=keynode->getAttributeNS(NULL,password);
 233         if (password_xml) {
 234             auto_ptr_char kp(password_xml);
 235             m_keypass=kp.get();
 236         }
 237
 238         e=XMLHelper::getFirstChildElement(keynode,Path);
 239         if (e && e->hasChildNodes()) {
 240             const XMLCh* s=e->getFirstChild()->getNodeValue();
 241             auto_ptr_char kpath(s);
 242             m_keypath = kpath.get();
 243             XMLToolingConfig::getConfig().getPathResolver()->resolve(m_keypath, PathResolver::XMLTOOLING_CFG_FILE);
 244 #ifdef WIN32
 245             struct _stat stat_buf;
 246             if (_stat(m_keypath.c_str(), &stat_buf) != 0)
 247 #else
 248             struct stat stat_buf;
 249             if (stat(m_keypath.c_str(), &stat_buf) != 0)
 250 #endif
 251             {
 252                 log.error("key file (%s) can't be opened", m_keypath.c_str());
 253                 throw XMLSecurityException("FilesystemCredentialResolver can't access key file ($1)",params(1,m_keypath.c_str()));
 254             }
 255         }
 256         else {
 257             log.error("Path element missing inside Key element");
 258             throw XMLSecurityException("FilesystemCredentialResolver can't access key file, no Path element specified.");
 259         }
 260
 261         // Determine the key encoding format dynamically, if not explicitly specified
 262         if (format_xml && *format_xml) {
 263             fformat = xmlFormatToFormat(format_xml);
 264             if (fformat != UNKNOWN) {
 265                 m_keyformat = fformat;
 266             }
 267             else {
 268                 auto_ptr_char unknown(format_xml);
 269                 log.error("configuration specifies unknown key encoding format (%s)", unknown.get());
 270                 throw XMLSecurityException("FilesystemCredentialResolver configuration contains unknown key encoding format ($1)",params(1,unknown.get()));
 271             }
 272         }
 273         else {
 274             in=BIO_new(BIO_s_file_internal());
 275             if (in && BIO_read_filename(in,m_keypath.c_str())>0) {
 276                 m_keyformat = getEncodingFormat(in);
 277                 log.debug("key encoding format for (%s) dynamically resolved as (%s)", m_keypath.c_str(), formatToString(m_keyformat).c_str());
 278             }
 279             else {
 280                 log.error("key file (%s) can't be read to determine encoding format", m_keypath.c_str());
 281                 throw XMLSecurityException("FilesystemCredentialResolver can't read key file ($1) to determine encoding format",params(1,m_keypath.c_str()));
 282             }
 283             if (in)
 284                 BIO_free(in);
 285             in = NULL;
 286         }
 287
 288         // Load the key.
 289         key = loadKey();
 290     }
 291
 292     // Check for CRL.
 293     const DOMElement* crlnode=XMLHelper::getFirstChildElement(root,CRL);
 294     if (crlnode) {
 295         // Get raw format attrib value, but defer processing til later since may need to
 296         // determine format dynamically, and we need the Path for that.
 297         format_xml=crlnode->getAttributeNS(NULL,format);
 298
 299         e=XMLHelper::getFirstChildElement(crlnode,Path);
 300         if (e && e->hasChildNodes()) {
 301             const XMLCh* s=e->getFirstChild()->getNodeValue();
 302             auto_ptr_char kpath(s);
 303             m_crlpath=kpath.get();
 304             XMLToolingConfig::getConfig().getPathResolver()->resolve(m_crlpath, PathResolver::XMLTOOLING_CFG_FILE);
 305 #ifdef WIN32
 306             struct _stat stat_buf;
 307             if (_stat(m_crlpath.c_str(), &stat_buf) != 0)
 308 #else
 309             struct stat stat_buf;
 310             if (stat(m_crlpath.c_str(), &stat_buf) != 0)
 311 #endif
 312             {
 313                 log.error("CRL file (%s) can't be opened", m_crlpath.c_str());
 314                 throw XMLSecurityException("FilesystemCredentialResolver can't access CRL file ($1)",params(1,m_crlpath.c_str()));
 315             }
 316         }
 317         else {
 318             log.error("Path element missing inside CRL element");
 319             throw XMLSecurityException("FilesystemCredentialResolver can't access CRL file, no Path element specified.");
 320         }
 321
 322         // Determine the CRL encoding format dynamically, if not explicitly specified
 323         if (format_xml && *format_xml) {
 324             fformat = xmlFormatToFormat(format_xml);
 325             if (fformat != UNKNOWN) {
 326                 m_crlformat = fformat;
 327             }
 328             else {
 329                 auto_ptr_char unknown(format_xml);
 330                 log.error("configuration specifies unknown CRL encoding format (%s)", unknown.get());
 331                 throw XMLSecurityException("FilesystemCredentialResolver configuration contains unknown CRL encoding format ($1)",params(1,unknown.get()));
 332             }
 333         }
 334         else {
 335             in=BIO_new(BIO_s_file_internal());
 336             if (in && BIO_read_filename(in,m_crlpath.c_str())>0) {
 337                 m_crlformat = getEncodingFormat(in);
 338                 log.debug("CRL encoding format for (%s) dynamically resolved as (%s)", m_crlpath.c_str(), formatToString(m_crlformat).c_str());
 339             }
 340             else {
 341                 log.error("CRL file (%s) can't be read to determine encoding format", m_crlpath.c_str());
 342                 throw XMLSecurityException("FilesystemCredentialResolver can't read CRL file ($1) to determine encoding format",params(1,m_crlpath.c_str()));
 343             }
 344             if (in)
 345                 BIO_free(in);
 346             in = NULL;
 347         }
 348
 349         // Load the key.
 350         crl = loadCRL();
 351     }
 352
 353     // Check for Certificate
 354     e=XMLHelper::getFirstChildElement(root,Certificate);
 355     if (!e) {
 356         m_credential = new FilesystemCredential(this,key,xseccerts,crl);
 357         m_credential->addKeyNames(keynode);
 358         m_credential->setUsage(usage);
 359         m_credential->initKeyInfo();
 360         return;
 361     }
 362     auto_ptr_char certpass(e->getAttributeNS(NULL,password));
 363
 364     const DOMElement* ep=XMLHelper::getFirstChildElement(e,Path);
 365     if (!ep || !ep->hasChildNodes()) {
 366         log.error("Path element missing inside Certificate element or is empty");
 367         delete key;
 368         delete crl;
 369         throw XMLSecurityException("FilesystemCredentialResolver can't access certificate file, missing or empty Path element.");
 370     }
 371
 372     auto_ptr_char certpath2(ep->getFirstChild()->getNodeValue());
 373     string certpath(certpath2.get());
 374     XMLToolingConfig::getConfig().getPathResolver()->resolve(certpath, PathResolver::XMLTOOLING_CFG_FILE);
 375
 376     format_xml=e->getAttributeNS(NULL,format);
 377     if (format_xml && *format_xml) {
 378         fformat = xmlFormatToFormat(format_xml);
 379         if (fformat == UNKNOWN) {
 380             auto_ptr_char unknown(format_xml);
 381             log.error("configuration specifies unknown certificate encoding format (%s)", unknown.get());
 382             delete key;
 383             delete crl;
 384             throw XMLSecurityException("FilesystemCredentialResolver configuration contains unknown certificate encoding format ($1)",params(1,unknown.get()));
 385         }
 386     }
 387
 388     try {
 389         X509* x=NULL;
 390         PKCS12* p12=NULL;
 391         in=BIO_new(BIO_s_file_internal());
 392         if (in && BIO_read_filename(in,certpath.c_str())>0) {
 393             if (!format_xml || !*format_xml) {
 394                 // Determine the cert encoding format dynamically, if not explicitly specified
 395                 fformat = getEncodingFormat(in);
 396                 log.debug("certificate encoding format for (%s) dynamically resolved as (%s)", certpath.c_str(), formatToString(fformat).c_str());
 397             }
 398
 399             Category::getInstance(XMLTOOLING_LOGCAT".CredentialResolver."FILESYSTEM_CREDENTIAL_RESOLVER).info(
 400                 "loading certificate from file (%s)", certpath.c_str()
 401                 );
 402
 403             switch(fformat) {
 404                 case PEM:
 405                     while (x=PEM_read_bio_X509(in,NULL,passwd_callback,const_cast<char*>(certpass.get())))
 406                         m_certs.push_back(x);
 407                     break;
 408
 409                 case DER:
 410                     x=d2i_X509_bio(in,NULL);
 411                     if (x)
 412                         m_certs.push_back(x);
 413                     else {
 414                         log_openssl();
 415                         BIO_free(in);
 416                         throw XMLSecurityException("FilesystemCredentialResolver unable to load DER certificate from file ($1)",params(1,certpath.c_str()));
 417                     }
 418                     break;
 419
 420                 case _PKCS12:
 421                     p12=d2i_PKCS12_bio(in,NULL);
 422                     if (p12) {
 423                         PKCS12_parse(p12, certpass.get(), NULL, &x, NULL);
 424                         PKCS12_free(p12);
 425                     }
 426                     if (x) {
 427                         m_certs.push_back(x);
 428                         x=NULL;
 429                     } else {
 430                         log_openssl();
 431                         BIO_free(in);
 432                         throw XMLSecurityException("FilesystemCredentialResolver unable to load PKCS12 certificate from file ($1)",params(1,certpath.c_str()));
 433                     }
 434                     break;
 435             } // end switch
 436
 437         } else {
 438             log_openssl();
 439             if (in) {
 440                 BIO_free(in);
 441                 in=NULL;
 442             }
 443             throw XMLSecurityException("FilesystemCredentialResolver unable to load certificate(s) from file ($1)",params(1,certpath.c_str()));
 444         }
 445         if (in) {
 446             BIO_free(in);
 447             in=NULL;
 448         }
 449
 450         if (m_certs.empty())
 451             throw XMLSecurityException("FilesystemCredentialResolver unable to load any certificate(s)");
 452
 453         // Load any extra CA files.
 454         const DOMElement* extra=XMLHelper::getFirstChildElement(e,CAPath);
 455         while (extra) {
 456             if (!extra->hasChildNodes()) {
 457                 log.warn("skipping empty CAPath element");
 458                 extra = XMLHelper::getNextSiblingElement(extra,CAPath);
 459                 continue;
 460             }
 461             auto_ptr_char capath2(extra->getFirstChild()->getNodeValue());
 462             string capath(capath2.get());
 463             XMLToolingConfig::getConfig().getPathResolver()->resolve(capath, PathResolver::XMLTOOLING_CFG_FILE);
 464             x=NULL;
 465             p12=NULL;
 466             in=BIO_new(BIO_s_file_internal());
 467             if (in && BIO_read_filename(in,capath.c_str())>0) {
 468                 if (!format_xml || !*format_xml) {
 469                     // Determine the cert encoding format dynamically, if not explicitly specified
 470                     fformat = getEncodingFormat(in);
 471                     log.debug("CA certificate encoding format for (%s) dynamically resolved as (%s)", capath.c_str(), formatToString(fformat).c_str());
 472                 }
 473
 474                 Category::getInstance(XMLTOOLING_LOGCAT".CredentialResolver."FILESYSTEM_CREDENTIAL_RESOLVER).info(
 475                     "loading CA certificate from file (%s)", capath.c_str()
 476                     );
 477
 478                 switch (fformat) {
 479                     case PEM:
 480                         while (x=PEM_read_bio_X509(in,NULL,NULL,NULL))
 481                             m_certs.push_back(x);
 482                         break;
 483
 484                     case DER:
 485                         x=d2i_X509_bio(in,NULL);
 486                         if (x)
 487                             m_certs.push_back(x);
 488                         else {
 489                             log_openssl();
 490                             BIO_free(in);
 491                             throw XMLSecurityException("FilesystemCredentialResolver unable to load DER CA certificate from file ($1)",params(1,capath.c_str()));
 492                         }
 493                         break;
 494
 495                     case _PKCS12:
 496                         p12 = d2i_PKCS12_bio(in, NULL);
 497                         if (p12) {
 498                             PKCS12_parse(p12, NULL, NULL, &x, NULL);
 499                             PKCS12_free(p12);
 500                         }
 501                         if (x) {
 502                             m_certs.push_back(x);
 503                             x=NULL;
 504                         }
 505                         else {
 506                             log_openssl();
 507                             BIO_free(in);
 508                             throw XMLSecurityException("FilesystemCredentialResolver unable to load PKCS12 CA certificate from file ($1)",params(1,capath.c_str()));
 509                         }
 510                         break;
 511                 } //end switch
 512
 513                 BIO_free(in);
 514             }
 515             else {
 516                 if (in)
 517                     BIO_free(in);
 518                 log_openssl();
 519                 log.error("CA certificate file (%s) can't be opened", capath.c_str());
 520                 throw XMLSecurityException("FilesystemCredentialResolver can't open CA certificate file ($1)",params(1,capath.c_str()));
 521             }
 522
 523             extra = XMLHelper::getNextSiblingElement(extra,CAPath);
 524         }
 525     }
 526     catch (XMLToolingException&) {
 527         delete key;
 528         delete crl;
 529         for_each(m_certs.begin(), m_certs.end(), X509_free);
 530         throw;
 531     }
 532
 533     // Reflect certs over to XSEC form and wrap with credential object.
 534     for (vector<X509*>::iterator j=m_certs.begin(); j!=m_certs.end(); j++)
 535         xseccerts.push_back(new OpenSSLCryptoX509(*j));
 536     if (!key && !xseccerts.empty())
 537         key = xseccerts.front()->clonePublicKey();
 538     m_credential = new FilesystemCredential(this, key, xseccerts, crl);
 539     m_credential->addKeyNames(keynode);
 540     m_credential->setUsage(usage);
 541     m_credential->initKeyInfo();
 542 }
 543
 544 XSECCryptoKey* FilesystemCredentialResolver::loadKey()
 545 {
 546 #ifdef _DEBUG
 547     NDC ndc("loadKey");
 548 #endif
 549     Category::getInstance(XMLTOOLING_LOGCAT".CredentialResolver."FILESYSTEM_CREDENTIAL_RESOLVER).info(
 550         "loading private key from file (%s)", m_keypath.c_str()
 551         );
 552
 553     // Get a EVP_PKEY.
 554     EVP_PKEY* pkey=NULL;
 555     BIO* in=BIO_new(BIO_s_file_internal());
 556     if (in && BIO_read_filename(in,m_keypath.c_str())>0) {
 557         switch (m_keyformat) {
 558             case PEM:
 559                 pkey=PEM_read_bio_PrivateKey(in, NULL, passwd_callback, const_cast<char*>(m_keypass.c_str()));
 560                 break;
 561
 562             case DER:
 563                 pkey=d2i_PrivateKey_bio(in, NULL);
 564                 break;
 565
 566             default: {
 567                 PKCS12* p12 = d2i_PKCS12_bio(in, NULL);
 568                 if (p12) {
 569                     PKCS12_parse(p12, const_cast<char*>(m_keypass.c_str()), &pkey, NULL, NULL);
 570                     PKCS12_free(p12);
 571                 }
 572             }
 573         }
 574     }
 575     if (in)
 576         BIO_free(in);
 577
 578     // Now map it to an XSEC wrapper.
 579     if (pkey) {
 580         XSECCryptoKey* ret=NULL;
 581         switch (pkey->type) {
 582             case EVP_PKEY_RSA:
 583                 ret=new OpenSSLCryptoKeyRSA(pkey);
 584                 break;
 585
 586             case EVP_PKEY_DSA:
 587                 ret=new OpenSSLCryptoKeyDSA(pkey);
 588                 break;
 589
 590             default:
 591                 Category::getInstance(XMLTOOLING_LOGCAT".CredentialResolver."FILESYSTEM_CREDENTIAL_RESOLVER).error("unsupported private key type");
 592         }
 593         EVP_PKEY_free(pkey);
 594         if (ret)
 595             return ret;
 596     }
 597
 598     log_openssl();
 599     throw XMLSecurityException("FilesystemCredentialResolver unable to load private key from file.");
 600 }
 601
 602 XSECCryptoX509CRL* FilesystemCredentialResolver::loadCRL()
 603 {
 604 #ifdef _DEBUG
 605     NDC ndc("loadCRL");
 606 #endif
 607     Category::getInstance(XMLTOOLING_LOGCAT".CredentialResolver."FILESYSTEM_CREDENTIAL_RESOLVER).info(
 608         "loading CRL from file (%s)", m_crlpath.c_str()
 609         );
 610
 611     X509_CRL* crl=NULL;
 612     BIO* in=BIO_new(BIO_s_file_internal());
 613     if (in && BIO_read_filename(in,m_crlpath.c_str())>0) {
 614         switch (m_crlformat) {
 615             case PEM:
 616                 crl=PEM_read_bio_X509_CRL(in, NULL, NULL, NULL);
 617                 break;
 618
 619             case DER:
 620                 crl=d2i_X509_CRL_bio(in, NULL);
 621                 break;
 622         }
 623     }
 624     if (in)
 625         BIO_free(in);
 626
 627     // Now map it to an XSEC wrapper.
 628     if (crl) {
 629         XSECCryptoX509CRL* ret=new OpenSSLCryptoX509CRL(crl);
 630         X509_CRL_free(crl);
 631         return ret;
 632     }
 633
 634     log_openssl();
 635     throw XMLSecurityException("FilesystemCredentialResolver unable to load CRL from file.");
 636 }
 637
 638 // Used to determine the encoding format of credentials files
 639 // dynamically. Supports: PEM, DER, PKCS12.
 640 FilesystemCredentialResolver::format_t FilesystemCredentialResolver::getEncodingFormat(BIO* in) const
 641 {
 642     PKCS12* p12 = NULL;
 643     format_t format;
 644
 645     const int READSIZE = 1;
 646     char buf[READSIZE];
 647     char b1;
 648     int mark;
 649
 650     try {
 651         if ( (mark = BIO_tell(in)) < 0 )
 652             throw XMLSecurityException("getEncodingFormat: BIO_tell() can't get the file position");
 653         if ( BIO_read(in, buf, READSIZE) <= 0 )
 654             throw XMLSecurityException("getEncodingFormat: BIO_read() can't read from the stream");
 655         if ( BIO_seek(in, mark) < 0 )
 656             throw XMLSecurityException("getEncodingFormat: BIO_seek() can't reset the file position");
 657     }
 658     catch (...) {
 659         log_openssl();
 660         throw;
 661     }
 662
 663     b1 = buf[0];
 664
 665     // This is a slight variation of the Java code by Chad La Joie.
 666     //
 667     // Check the first byte of the file.  If it's some kind of
 668     // DER-encoded structure (including PKCS12), it will begin with ASCII 048.
 669     // Otherwise, assume it's PEM.
 670     if (b1 !=  48) {
 671         format = PEM;
 672     } else {
 673         // Here we know it's DER-encoded, now try to parse it as a PKCS12
 674         // ASN.1 structure.  If it fails, must be another kind of DER-encoded
 675         // key/cert structure.  A little inefficient...but it works.
 676         if ( (p12=d2i_PKCS12_bio(in,NULL)) == NULL ) {
 677             format = DER;
 678         } else {
 679             format = _PKCS12;
 680         }
 681         if (p12)
 682             PKCS12_free(p12);
 683         if ( BIO_seek(in, mark) < 0 ) {
 684             log_openssl();
 685             throw XMLSecurityException("getEncodingFormat: BIO_seek() can't reset the file position");
 686         }
 687     }
 688
 689     return format;
 690 }
 691
 692 // Convert key/cert format_t types to a human-meaningful string for debug output
 693 string FilesystemCredentialResolver::formatToString(format_t format) const
 694 {
 695     switch(format) {
 696         case PEM:
 697             return "PEM";
 698         case DER:
 699             return "DER";
 700         case _PKCS12:
 701             return "PKCS12";
 702         default:
 703             return "UNKNOWN";
 704     }
 705 }
 706
 707 // Convert key/cert raw XML format attribute (XMLCh[]) to format_t type
 708 FilesystemCredentialResolver::format_t FilesystemCredentialResolver::xmlFormatToFormat(const XMLCh* format_xml) const
 709 {
 710     static const XMLCh cPEM[] = UNICODE_LITERAL_3(P,E,M);
 711     static const XMLCh cDER[] = UNICODE_LITERAL_3(D,E,R);
 712     static const XMLCh cPKCS12[] = { chLatin_P, chLatin_K, chLatin_C, chLatin_S, chDigit_1, chDigit_2, chNull };
 713     format_t format;
 714
 715     if (!XMLString::compareString(format_xml,cPEM))
 716         format=PEM;
 717     else if (!XMLString::compareString(format_xml,cDER))
 718         format=DER;
 719     else if (!XMLString::compareString(format_xml,cPKCS12))
 720         format=_PKCS12;
 721     else
 722         format=UNKNOWN;
 723
 724     return format;
 725 }
 726
 727 void FilesystemCredentialResolver::attach(SSL_CTX* ctx) const
 728 {
 729 #ifdef _DEBUG
 730     NDC ndc("attach");
 731 #endif
 732
 733     if (m_keypath.empty())
 734         throw XMLSecurityException("No key available, unable to attach private key to SSL context.");
 735
 736     // Attach key.
 737     SSL_CTX_set_default_passwd_cb(ctx, passwd_callback);
 738     SSL_CTX_set_default_passwd_cb_userdata(ctx, const_cast<char*>(m_keypass.c_str()));
 739
 740     int ret=0;
 741     switch (m_keyformat) {
 742         case PEM:
 743             ret=SSL_CTX_use_PrivateKey_file(ctx, m_keypath.c_str(), m_keyformat);
 744             break;
 745
 746         case DER:
 747             ret=SSL_CTX_use_RSAPrivateKey_file(ctx, m_keypath.c_str(), m_keyformat);
 748             break;
 749
 750         default: {
 751             BIO* in=BIO_new(BIO_s_file_internal());
 752             if (in && BIO_read_filename(in,m_keypath.c_str())>0) {
 753                 EVP_PKEY* pkey=NULL;
 754                 PKCS12* p12 = d2i_PKCS12_bio(in, NULL);
 755                 if (p12) {
 756                     PKCS12_parse(p12, const_cast<char*>(m_keypass.c_str()), &pkey, NULL, NULL);
 757                     PKCS12_free(p12);
 758                     if (pkey) {
 759                         ret=SSL_CTX_use_PrivateKey(ctx, pkey);
 760                         EVP_PKEY_free(pkey);
 761                     }
 762                 }
 763             }
 764             if (in)
 765                 BIO_free(in);
 766         }
 767     }
 768
 769     if (ret!=1) {
 770         log_openssl();
 771         throw XMLSecurityException("Unable to attach private key to SSL context.");
 772     }
 773
 774     // Attach certs.
 775     for (vector<X509*>::const_iterator i=m_certs.begin(); i!=m_certs.end(); i++) {
 776         if (i==m_certs.begin()) {
 777             if (SSL_CTX_use_certificate(ctx, *i) != 1) {
 778                 log_openssl();
 779                 throw XMLSecurityException("Unable to attach client certificate to SSL context.");
 780             }
 781         }
 782         else {
 783             // When we add certs, they don't get ref counted, so we need to duplicate them.
 784             X509* dup = X509_dup(*i);
 785             if (SSL_CTX_add_extra_chain_cert(ctx, dup) != 1) {
 786                 X509_free(dup);
 787                 log_openssl();
 788                 throw XMLSecurityException("Unable to attach CA certificate to SSL context.");
 789             }
 790         }
 791     }
 792 }
 793
 794 void FilesystemCredential::addKeyNames(const DOMElement* e)
 795 {
 796     e = e ? XMLHelper::getFirstChildElement(e, Name) : NULL;
 797     while (e) {
 798         if (e->hasChildNodes()) {
 799             auto_ptr_char n(e->getFirstChild()->getNodeValue());
 800             if (n.get() && *n.get())
 801                 m_keyNames.insert(n.get());
 802         }
 803         e = XMLHelper::getNextSiblingElement(e, Name);
 804     }
 805 }
 806
 807 void FilesystemCredential::attach(SSL_CTX* ctx) const
 808 {
 809     return m_resolver->attach(ctx);
 810 }