xmltooling/soap/impl/CURLSOAPTransport.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  * CURLSOAPTransport.cpp
  19  *
  20  * libcurl-based SOAPTransport implementation
  21  */
  22
  23 #include "internal.h"
  24 #include "exceptions.h"
  25 #include "logging.h"
  26 #include "security/CredentialCriteria.h"
  27 #include "security/OpenSSLTrustEngine.h"
  28 #include "security/OpenSSLCredential.h"
  29 #include "soap/HTTPSOAPTransport.h"
  30 #include "soap/OpenSSLSOAPTransport.h"
  31 #include "util/NDC.h"
  32 #include "util/Threads.h"
  33
  34 #include <list>
  35 #include <curl/curl.h>
  36 #include <openssl/x509_vfy.h>
  37
  38 using namespace xmltooling::logging;
  39 using namespace xmltooling;
  40 using namespace std;
  41
  42 namespace xmltooling {
  43
  44     // Manages cache of socket connections via CURL handles.
  45     class XMLTOOL_DLLLOCAL CURLPool
  46     {
  47     public:
  48         CURLPool() : m_size(0), m_lock(Mutex::create()),
  49             m_log(Category::getInstance(XMLTOOLING_LOGCAT".SOAPTransport.CURLPool")) {}
  50         ~CURLPool();
  51
  52         CURL* get(const SOAPTransport::Address& addr);
  53         void put(const char* from, const char* to, const char* endpoint, CURL* handle);
  54
  55     private:
  56         typedef map<string,vector<CURL*> > poolmap_t;
  57         poolmap_t m_bindingMap;
  58         list< vector<CURL*>* > m_pools;
  59         long m_size;
  60         Mutex* m_lock;
  61         Category& m_log;
  62     };
  63
  64     static XMLTOOL_DLLLOCAL CURLPool* g_CURLPool = NULL;
  65
  66     class XMLTOOL_DLLLOCAL CURLSOAPTransport : public HTTPSOAPTransport, public OpenSSLSOAPTransport
  67     {
  68     public:
  69         CURLSOAPTransport(const Address& addr)
  70             : m_sender(addr.m_from ? addr.m_from : ""), m_peerName(addr.m_to ? addr.m_to : ""), m_endpoint(addr.m_endpoint),
  71                 m_handle(NULL), m_headers(NULL),
  72 #ifndef XMLTOOLING_NO_XMLSEC
  73                     m_cred(NULL), m_trustEngine(NULL), m_peerResolver(NULL), m_mandatory(false),
  74 #endif
  75                     m_ssl_callback(NULL), m_ssl_userptr(NULL), m_chunked(true), m_authenticated(false) {
  76             m_handle = g_CURLPool->get(addr);
  77             curl_easy_setopt(m_handle,CURLOPT_URL,addr.m_endpoint);
  78             curl_easy_setopt(m_handle,CURLOPT_CONNECTTIMEOUT,15);
  79             curl_easy_setopt(m_handle,CURLOPT_TIMEOUT,30);
  80             curl_easy_setopt(m_handle,CURLOPT_HTTPAUTH,0);
  81             curl_easy_setopt(m_handle,CURLOPT_USERPWD,NULL);
  82             curl_easy_setopt(m_handle,CURLOPT_SSL_VERIFYHOST,2);
  83             curl_easy_setopt(m_handle,CURLOPT_HEADERDATA,this);
  84             m_headers=curl_slist_append(m_headers,"Content-Type: text/xml");
  85         }
  86
  87         virtual ~CURLSOAPTransport() {
  88             curl_slist_free_all(m_headers);
  89             curl_easy_setopt(m_handle,CURLOPT_ERRORBUFFER,NULL);
  90             curl_easy_setopt(m_handle,CURLOPT_PRIVATE,m_authenticated ? "secure" : NULL); // Save off security "state".
  91             g_CURLPool->put(m_sender.c_str(), m_peerName.c_str(), m_endpoint.c_str(), m_handle);
  92         }
  93
  94         bool isConfidential() const {
  95             return m_endpoint.find("https")==0;
  96         }
  97
  98         bool setConnectTimeout(long timeout) {
  99             return (curl_easy_setopt(m_handle,CURLOPT_CONNECTTIMEOUT,timeout)==CURLE_OK);
 100         }
 101
 102         bool setTimeout(long timeout) {
 103             return (curl_easy_setopt(m_handle,CURLOPT_TIMEOUT,timeout)==CURLE_OK);
 104         }
 105
 106         bool setAuth(transport_auth_t authType, const char* username=NULL, const char* password=NULL);
 107
 108         bool setVerifyHost(bool verify) {
 109             return (curl_easy_setopt(m_handle,CURLOPT_SSL_VERIFYHOST,verify ? 2 : 0)==CURLE_OK);
 110         }
 111
 112 #ifndef XMLTOOLING_NO_XMLSEC
 113         bool setCredential(const Credential* cred=NULL) {
 114             const OpenSSLCredential* down = dynamic_cast<const OpenSSLCredential*>(cred);
 115             if (!down) {
 116                 m_cred = NULL;
 117                 return (cred==NULL);
 118             }
 119             m_cred = down;
 120             return true;
 121         }
 122
 123         bool setTrustEngine(
 124             const X509TrustEngine* trustEngine=NULL,
 125             const CredentialResolver* peerResolver=NULL,
 126             CredentialCriteria* criteria=NULL,
 127             bool mandatory=true
 128             ) {
 129             const OpenSSLTrustEngine* down = dynamic_cast<const OpenSSLTrustEngine*>(trustEngine);
 130             if (!down) {
 131                 m_trustEngine = NULL;
 132                 m_peerResolver = NULL;
 133                 m_criteria = NULL;
 134                 return (trustEngine==NULL);
 135             }
 136             m_trustEngine = down;
 137             m_peerResolver = peerResolver;
 138             m_criteria = criteria;
 139             m_mandatory = mandatory;
 140             return true;
 141         }
 142
 143 #endif
 144
 145         bool useChunkedEncoding(bool chunked=true) {
 146             m_chunked = chunked;
 147             return true;
 148         }
 149
 150         bool setProviderOption(const char* provider, const char* option, const char* value) {
 151             if (!provider || strcmp(provider, "CURL"))
 152                 return false;
 153             // For libcurl, the option is an enum and the value type depends on the option.
 154             CURLoption opt = static_cast<CURLoption>(strtol(option, NULL, 10));
 155             if (opt < CURLOPTTYPE_OBJECTPOINT)
 156                 return (curl_easy_setopt(m_handle, opt, strtol(value, NULL, 10)) == CURLE_OK);
 157             else if (opt < CURLOPTTYPE_OFF_T)
 158                 return (curl_easy_setopt(m_handle, opt, value) == CURLE_OK);
 159             else if (sizeof(curl_off_t) == sizeof(long))
 160                 return (curl_easy_setopt(m_handle, opt, strtol(value, NULL, 10)) == CURLE_OK);
 161             return false;
 162         }
 163
 164         void send(istream& in);
 165
 166         istream& receive() {
 167             return m_stream;
 168         }
 169
 170         bool isAuthenticated() const {
 171             return m_authenticated;
 172         }
 173
 174         void setAuthenticated(bool auth) {
 175             m_authenticated = auth;
 176         }
 177
 178         string getContentType() const;
 179
 180         bool setRequestHeader(const char* name, const char* val) {
 181             string temp(name);
 182             temp=temp + ": " + val;
 183             m_headers=curl_slist_append(m_headers,temp.c_str());
 184             return true;
 185         }
 186
 187         const vector<string>& getResponseHeader(const char* val) const;
 188
 189         bool setSSLCallback(ssl_ctx_callback_fn fn, void* userptr=NULL) {
 190             m_ssl_callback=fn;
 191             m_ssl_userptr=userptr;
 192             return true;
 193         }
 194
 195     private:
 196         // per-call state
 197         string m_sender,m_peerName,m_endpoint,m_simplecreds;
 198         CURL* m_handle;
 199         stringstream m_stream;
 200         struct curl_slist* m_headers;
 201         map<string,vector<string> > m_response_headers;
 202 #ifndef XMLTOOLING_NO_XMLSEC
 203         const OpenSSLCredential* m_cred;
 204         const OpenSSLTrustEngine* m_trustEngine;
 205         const CredentialResolver* m_peerResolver;
 206         CredentialCriteria* m_criteria;
 207         bool m_mandatory;
 208 #endif
 209         ssl_ctx_callback_fn m_ssl_callback;
 210         void* m_ssl_userptr;
 211         bool m_chunked;
 212         bool m_authenticated;
 213
 214         friend size_t XMLTOOL_DLLLOCAL curl_header_hook(void* ptr, size_t size, size_t nmemb, void* stream);
 215         friend CURLcode XMLTOOL_DLLLOCAL xml_ssl_ctx_callback(CURL* curl, SSL_CTX* ssl_ctx, void* userptr);
 216         friend int XMLTOOL_DLLLOCAL verify_callback(X509_STORE_CTX* x509_ctx, void* arg);
 217     };
 218
 219     // libcurl callback functions
 220     size_t XMLTOOL_DLLLOCAL curl_header_hook(void* ptr, size_t size, size_t nmemb, void* stream);
 221     size_t XMLTOOL_DLLLOCAL curl_write_hook(void* ptr, size_t size, size_t nmemb, void* stream);
 222     size_t XMLTOOL_DLLLOCAL curl_read_hook( void *ptr, size_t size, size_t nmemb, void *stream);
 223     int XMLTOOL_DLLLOCAL curl_debug_hook(CURL* handle, curl_infotype type, char* data, size_t len, void* ptr);
 224     CURLcode XMLTOOL_DLLLOCAL xml_ssl_ctx_callback(CURL* curl, SSL_CTX* ssl_ctx, void* userptr);
 225 #ifndef XMLTOOLING_NO_XMLSEC
 226     int XMLTOOL_DLLLOCAL verify_callback(X509_STORE_CTX* x509_ctx, void* arg);
 227 #endif
 228
 229     SOAPTransport* CURLSOAPTransportFactory(const SOAPTransport::Address& addr)
 230     {
 231         return new CURLSOAPTransport(addr);
 232     }
 233 };
 234
 235 void xmltooling::registerSOAPTransports()
 236 {
 237     XMLToolingConfig& conf=XMLToolingConfig::getConfig();
 238     conf.SOAPTransportManager.registerFactory("http", CURLSOAPTransportFactory);
 239     conf.SOAPTransportManager.registerFactory("https", CURLSOAPTransportFactory);
 240 }
 241
 242 void xmltooling::initSOAPTransports()
 243 {
 244     g_CURLPool=new CURLPool();
 245 }
 246
 247 void xmltooling::termSOAPTransports()
 248 {
 249     delete g_CURLPool;
 250     g_CURLPool = NULL;
 251 }
 252
 253 CURLPool::~CURLPool()
 254 {
 255     for (poolmap_t::iterator i=m_bindingMap.begin(); i!=m_bindingMap.end(); i++) {
 256         for (vector<CURL*>::iterator j=i->second.begin(); j!=i->second.end(); j++)
 257             curl_easy_cleanup(*j);
 258     }
 259     delete m_lock;
 260 }
 261
 262 CURL* CURLPool::get(const SOAPTransport::Address& addr)
 263 {
 264 #ifdef _DEBUG
 265     xmltooling::NDC("get");
 266 #endif
 267     m_log.debug("getting connection handle to %s", addr.m_endpoint);
 268     string key(addr.m_endpoint);
 269     if (addr.m_from)
 270         key = key + '|' + addr.m_from;
 271     if (addr.m_to)
 272         key = key + '|' + addr.m_to;
 273     m_lock->lock();
 274     poolmap_t::iterator i=m_bindingMap.find(key);
 275
 276     if (i!=m_bindingMap.end()) {
 277         // Move this pool to the front of the list.
 278         m_pools.remove(&(i->second));
 279         m_pools.push_front(&(i->second));
 280
 281         // If a free connection exists, return it.
 282         if (!(i->second.empty())) {
 283             CURL* handle=i->second.back();
 284             i->second.pop_back();
 285             m_size--;
 286             m_lock->unlock();
 287             m_log.debug("returning existing connection handle from pool");
 288             return handle;
 289         }
 290     }
 291
 292     m_lock->unlock();
 293     m_log.debug("nothing free in pool, returning new connection handle");
 294
 295     // Create a new connection and set non-varying options.
 296     CURL* handle=curl_easy_init();
 297     if (!handle)
 298         return NULL;
 299     curl_easy_setopt(handle,CURLOPT_NOPROGRESS,1);
 300     curl_easy_setopt(handle,CURLOPT_NOSIGNAL,1);
 301     curl_easy_setopt(handle,CURLOPT_FAILONERROR,1);
 302     curl_easy_setopt(handle,CURLOPT_SSLVERSION,CURL_SSLVERSION_SSLv3);
 303     curl_easy_setopt(handle,CURLOPT_SSL_CIPHER_LIST,"ALL:!aNULL:!LOW:!EXPORT:!SSLv2");
 304     // Verification of the peer is via TrustEngine only.
 305     curl_easy_setopt(handle,CURLOPT_SSL_VERIFYPEER,0);
 306     curl_easy_setopt(handle,CURLOPT_HEADERFUNCTION,&curl_header_hook);
 307     curl_easy_setopt(handle,CURLOPT_WRITEFUNCTION,&curl_write_hook);
 308     curl_easy_setopt(handle,CURLOPT_DEBUGFUNCTION,&curl_debug_hook);
 309
 310     return handle;
 311 }
 312
 313 void CURLPool::put(const char* from, const char* to, const char* endpoint, CURL* handle)
 314 {
 315     string key(endpoint);
 316     if (from)
 317         key = key + '|' + from;
 318     if (to)
 319         key = key + '|' + to;
 320     m_lock->lock();
 321     poolmap_t::iterator i=m_bindingMap.find(key);
 322     if (i==m_bindingMap.end())
 323         m_pools.push_front(&(m_bindingMap.insert(poolmap_t::value_type(key,vector<CURL*>(1,handle))).first->second));
 324     else
 325         i->second.push_back(handle);
 326
 327     CURL* killit=NULL;
 328     if (++m_size > 256) {
 329         // Kick a handle out from the back of the bus.
 330         while (true) {
 331             vector<CURL*>* corpse=m_pools.back();
 332             if (!corpse->empty()) {
 333                 killit=corpse->back();
 334                 corpse->pop_back();
 335                 m_size--;
 336                 break;
 337             }
 338
 339             // Move an empty pool up to the front so we don't keep hitting it.
 340             m_pools.pop_back();
 341             m_pools.push_front(corpse);
 342         }
 343     }
 344     m_lock->unlock();
 345     if (killit) {
 346         curl_easy_cleanup(killit);
 347 #ifdef _DEBUG
 348         xmltooling::NDC("put");
 349 #endif
 350         m_log.info("conn_pool_max limit reached, dropping an old connection");
 351     }
 352 }
 353
 354 bool CURLSOAPTransport::setAuth(transport_auth_t authType, const char* username, const char* password)
 355 {
 356     if (authType==transport_auth_none) {
 357         if (curl_easy_setopt(m_handle,CURLOPT_HTTPAUTH,0)!=CURLE_OK)
 358             return false;
 359         return (curl_easy_setopt(m_handle,CURLOPT_USERPWD,NULL)==CURLE_OK);
 360     }
 361     long flag=0;
 362     switch (authType) {
 363         case transport_auth_basic:    flag = CURLAUTH_BASIC; break;
 364         case transport_auth_digest:   flag = CURLAUTH_DIGEST; break;
 365         case transport_auth_ntlm:     flag = CURLAUTH_NTLM; break;
 366         case transport_auth_gss:      flag = CURLAUTH_GSSNEGOTIATE; break;
 367         default:            return false;
 368     }
 369     if (curl_easy_setopt(m_handle,CURLOPT_HTTPAUTH,flag)!=CURLE_OK)
 370         return false;
 371     m_simplecreds = string(username ? username : "") + ':' + (password ? password : "");
 372     return (curl_easy_setopt(m_handle,CURLOPT_USERPWD,m_simplecreds.c_str())==CURLE_OK);
 373 }
 374
 375 const vector<string>& CURLSOAPTransport::getResponseHeader(const char* name) const
 376 {
 377     static vector<string> emptyVector;
 378
 379     map<string,vector<string> >::const_iterator i=m_response_headers.find(name);
 380     if (i!=m_response_headers.end())
 381         return i->second;
 382
 383     for (map<string,vector<string> >::const_iterator j=m_response_headers.begin(); j!=m_response_headers.end(); j++) {
 384 #ifdef HAVE_STRCASECMP
 385         if (!strcasecmp(j->first.c_str(), name))
 386 #else
 387         if (!stricmp(j->first.c_str(), name))
 388 #endif
 389             return j->second;
 390     }
 391
 392     return emptyVector;
 393 }
 394
 395 string CURLSOAPTransport::getContentType() const
 396 {
 397     char* content_type=NULL;
 398     curl_easy_getinfo(m_handle,CURLINFO_CONTENT_TYPE,&content_type);
 399     return content_type ? content_type : "";
 400 }
 401
 402 void CURLSOAPTransport::send(istream& in)
 403 {
 404 #ifdef _DEBUG
 405     xmltooling::NDC ndc("send");
 406 #endif
 407     Category& log=Category::getInstance(XMLTOOLING_LOGCAT".SOAPTransport");
 408     Category& log_curl=Category::getInstance(XMLTOOLING_LOGCAT".libcurl");
 409
 410     string msg;
 411
 412     // By this time, the handle has been prepared with the URL to use and the
 413     // caller should have executed any set functions to manipulate it.
 414
 415     // Setup standard per-call curl properties.
 416     curl_easy_setopt(m_handle,CURLOPT_DEBUGDATA,&log_curl);
 417     curl_easy_setopt(m_handle,CURLOPT_FILE,&m_stream);
 418     curl_easy_setopt(m_handle,CURLOPT_POST,1);
 419     if (m_chunked) {
 420         m_headers=curl_slist_append(m_headers,"Transfer-Encoding: chunked");
 421         curl_easy_setopt(m_handle,CURLOPT_READFUNCTION,&curl_read_hook);
 422         curl_easy_setopt(m_handle,CURLOPT_READDATA,&in);
 423     }
 424     else {
 425         char buf[1024];
 426         while (in) {
 427             in.read(buf,1024);
 428             msg.append(buf,in.gcount());
 429         }
 430         curl_easy_setopt(m_handle,CURLOPT_READFUNCTION,NULL);
 431         curl_easy_setopt(m_handle,CURLOPT_POSTFIELDS,msg.c_str());
 432         curl_easy_setopt(m_handle,CURLOPT_POSTFIELDSIZE,msg.length());
 433     }
 434
 435     char curl_errorbuf[CURL_ERROR_SIZE];
 436     curl_errorbuf[0]=0;
 437     curl_easy_setopt(m_handle,CURLOPT_ERRORBUFFER,curl_errorbuf);
 438     if (log_curl.isDebugEnabled())
 439         curl_easy_setopt(m_handle,CURLOPT_VERBOSE,1);
 440
 441     // Set request headers.
 442     curl_easy_setopt(m_handle,CURLOPT_HTTPHEADER,m_headers);
 443
 444 #ifndef XMLTOOLING_NO_XMLSEC
 445     if (m_ssl_callback || m_cred || m_trustEngine) {
 446 #else
 447     if (m_ssl_callback) {
 448 #endif
 449         curl_easy_setopt(m_handle,CURLOPT_SSL_CTX_FUNCTION,xml_ssl_ctx_callback);
 450         curl_easy_setopt(m_handle,CURLOPT_SSL_CTX_DATA,this);
 451
 452         // Restore security "state". Necessary because the callback only runs
 453         // when handshakes occur. Even new TCP connections won't execute it.
 454         char* priv=NULL;
 455         curl_easy_getinfo(m_handle,CURLINFO_PRIVATE,&priv);
 456         if (priv)
 457             m_authenticated=true;
 458     }
 459     else {
 460         curl_easy_setopt(m_handle,CURLOPT_SSL_CTX_FUNCTION,NULL);
 461         curl_easy_setopt(m_handle,CURLOPT_SSL_CTX_DATA,NULL);
 462     }
 463
 464     // Make the call.
 465     log.debug("sending SOAP message to %s", m_endpoint.c_str());
 466     if (curl_easy_perform(m_handle) != CURLE_OK) {
 467         throw IOException(
 468             string("CURLSOAPTransport failed while contacting SOAP responder: ") +
 469                 (curl_errorbuf[0] ? curl_errorbuf : "no further information available"));
 470     }
 471 }
 472
 473 // callback to buffer headers from server
 474 size_t xmltooling::curl_header_hook(void* ptr, size_t size, size_t nmemb, void* stream)
 475 {
 476     // only handle single-byte data
 477     if (size!=1)
 478         return 0;
 479     CURLSOAPTransport* ctx = reinterpret_cast<CURLSOAPTransport*>(stream);
 480     char* buf = (char*)malloc(nmemb + 1);
 481     if (buf) {
 482         memset(buf,0,nmemb + 1);
 483         memcpy(buf,ptr,nmemb);
 484         char* sep=(char*)strchr(buf,':');
 485         if (sep) {
 486             *(sep++)=0;
 487             while (*sep==' ')
 488                 *(sep++)=0;
 489             char* white=buf+nmemb-1;
 490             while (isspace(*white))
 491                 *(white--)=0;
 492             ctx->m_response_headers[buf].push_back(sep);
 493         }
 494         free(buf);
 495         return nmemb;
 496     }
 497     return 0;
 498 }
 499
 500 // callback to send data to server
 501 size_t xmltooling::curl_read_hook(void* ptr, size_t size, size_t nmemb, void* stream)
 502 {
 503     // *stream is actually an istream object
 504     istream& buf=*(reinterpret_cast<istream*>(stream));
 505     buf.read(reinterpret_cast<char*>(ptr),size*nmemb);
 506     return buf.gcount();
 507 }
 508
 509 // callback to buffer data from server
 510 size_t xmltooling::curl_write_hook(void* ptr, size_t size, size_t nmemb, void* stream)
 511 {
 512     size_t len = size*nmemb;
 513     reinterpret_cast<stringstream*>(stream)->write(reinterpret_cast<const char*>(ptr),len);
 514     return len;
 515 }
 516
 517 // callback for curl debug data
 518 int xmltooling::curl_debug_hook(CURL* handle, curl_infotype type, char* data, size_t len, void* ptr)
 519 {
 520     // *ptr is actually a logging object
 521     if (!ptr) return 0;
 522     CategoryStream log=reinterpret_cast<Category*>(ptr)->debugStream();
 523     for (unsigned char* ch=(unsigned char*)data; len && (isprint(*ch) || isspace(*ch)); len--)
 524         log << *ch++;
 525     return 0;
 526 }
 527
 528 #ifndef XMLTOOLING_NO_XMLSEC
 529 int xmltooling::verify_callback(X509_STORE_CTX* x509_ctx, void* arg)
 530 {
 531     Category& log = Category::getInstance("OpenSSL");
 532     log.debug("invoking X509 verify callback");
 533 #if (OPENSSL_VERSION_NUMBER >= 0x00907000L)
 534     CURLSOAPTransport* ctx = reinterpret_cast<CURLSOAPTransport*>(arg);
 535 #else
 536     // Yes, this sucks. I'd use TLS, but there's no really obvious spot to put the thread key
 537     // and global variables suck too. We can't access the X509_STORE_CTX depth directly because
 538     // OpenSSL only copies it into the context if it's >=0, and the unsigned pointer may be
 539     // negative in the SSL structure's int member.
 540     CURLSOAPTransport* ctx = reinterpret_cast<CURLSOAPTransport*>(
 541         SSL_get_verify_depth(
 542             reinterpret_cast<SSL*>(X509_STORE_CTX_get_ex_data(x509_ctx,SSL_get_ex_data_X509_STORE_CTX_idx()))
 543             )
 544         );
 545 #endif
 546
 547     bool success=false;
 548     if (ctx->m_criteria) {
 549         ctx->m_criteria->setUsage(CredentialCriteria::TLS_CREDENTIAL);
 550         // Bypass name check (handled for us by curl).
 551         ctx->m_criteria->setPeerName(NULL);
 552         success = ctx->m_trustEngine->validate(x509_ctx->cert,x509_ctx->untrusted,*(ctx->m_peerResolver),ctx->m_criteria);
 553     }
 554     else {
 555         // Bypass name check (handled for us by curl).
 556         CredentialCriteria cc;
 557         cc.setUsage(CredentialCriteria::TLS_CREDENTIAL);
 558         success = ctx->m_trustEngine->validate(x509_ctx->cert,x509_ctx->untrusted,*(ctx->m_peerResolver),&cc);
 559     }
 560
 561     if (!success) {
 562         log.error("supplied TrustEngine failed to validate SSL/TLS server certificate");
 563         x509_ctx->error=X509_V_ERR_APPLICATION_VERIFICATION;     // generic error, check log for plugin specifics
 564         ctx->setAuthenticated(false);
 565         return ctx->m_mandatory ? 0 : 1;
 566     }
 567
 568     // Signal success. Hopefully it doesn't matter what's actually in the structure now.
 569     ctx->setAuthenticated(true);
 570     return 1;
 571 }
 572 #endif
 573
 574 // callback to invoke a caller-defined SSL callback
 575 CURLcode xmltooling::xml_ssl_ctx_callback(CURL* curl, SSL_CTX* ssl_ctx, void* userptr)
 576 {
 577     CURLSOAPTransport* conf = reinterpret_cast<CURLSOAPTransport*>(userptr);
 578
 579 #ifndef XMLTOOLING_NO_XMLSEC
 580     if (conf->m_cred)
 581         conf->m_cred->attach(ssl_ctx);
 582
 583     if (conf->m_trustEngine) {
 584         SSL_CTX_set_verify(ssl_ctx,SSL_VERIFY_PEER,NULL);
 585 #if (OPENSSL_VERSION_NUMBER >= 0x00907000L)
 586         // With 0.9.7, we can pass a callback argument directly.
 587         SSL_CTX_set_cert_verify_callback(ssl_ctx,verify_callback,userptr);
 588 #else
 589         // With 0.9.6, there's no argument, so we're going to use a really embarrassing hack and
 590         // stuff the argument in the depth property where it will get copied to the context object
 591         // that's handed to the callback.
 592         SSL_CTX_set_cert_verify_callback(ssl_ctx,reinterpret_cast<int (*)()>(verify_callback),NULL);
 593         SSL_CTX_set_verify_depth(ssl_ctx,reinterpret_cast<int>(userptr));
 594 #endif
 595     }
 596 #endif
 597
 598     if (conf->m_ssl_callback && !conf->m_ssl_callback(conf, ssl_ctx, conf->m_ssl_userptr))
 599         return CURLE_SSL_CERTPROBLEM;
 600
 601     return CURLE_OK;
 602 }