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