SSLServer.cc

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00001 // SSLServer.cc
00002 
00003 // This file is part of bes, A C++ back-end server implementation framework
00004 // for the OPeNDAP Data Access Protocol.
00005 
00006 // Copyright (c) 2004-2009 University Corporation for Atmospheric Research
00007 // Author: Patrick West <pwest@ucar.edu> and Jose Garcia <jgarcia@ucar.edu>
00008 //
00009 // This library is free software; you can redistribute it and/or
00010 // modify it under the terms of the GNU Lesser General Public
00011 // License as published by the Free Software Foundation; either
00012 // version 2.1 of the License, or (at your option) any later version.
00013 // 
00014 // This library is distributed in the hope that it will be useful,
00015 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00016 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017 // Lesser General Public License for more details.
00018 // 
00019 // You should have received a copy of the GNU Lesser General Public
00020 // License along with this library; if not, write to the Free Software
00021 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00022 //
00023 // You can contact University Corporation for Atmospheric Research at
00024 // 3080 Center Green Drive, Boulder, CO 80301
00025  
00026 // (c) COPYRIGHT University Corporation for Atmospheric Research 2004-2005
00027 // Please read the full copyright statement in the file COPYRIGHT_UCAR.
00028 //
00029 // Authors:
00030 //      pwest       Patrick West <pwest@ucar.edu>
00031 //      jgarcia     Jose Garcia <jgarcia@ucar.edu>
00032 
00033 #include "config.h"
00034 
00035 #include <openssl/ssl.h>
00036 #include <openssl/err.h>
00037 #include <sys/types.h>   // not needed in POSIX 2001, still safer
00038 #include <sys/socket.h>  // for accept setsockopt bind listen
00039 #include <netinet/in.h>
00040 #include <arpa/inet.h>   // for htons
00041 #include <netdb.h>
00042 
00043 #include <iostream>
00044 #include <cstring>
00045 
00046 #ifndef HAVE_SYS_ERRLIST
00047 #include <cerrno>
00048 #endif
00049 #ifdef HAVE_UNISTD_H
00050 #include <unistd.h>
00051 #endif
00052 
00053 using std::endl ;
00054 
00055 #include "SSLServer.h"
00056 #include "BESInternalError.h"
00057 #include "BESDebug.h"
00058 
00059 SSLServer::SSLServer( int portVal,
00060                       const string &cert_file,
00061                       const string &cert_auth_file,
00062                       const string &key_file )
00063     : SSLConnection(),
00064       _port( portVal ),
00065       _cfile( cert_file ),
00066       _cafile( cert_auth_file ),
00067       _kfile( key_file )
00068 {
00069 }
00070     
00071 SSLServer::~SSLServer()
00072 {
00073 }
00074 
00075 void
00076 SSLServer::initConnection()
00077 {
00078     BESDEBUG( "ppt", "Loading SSL error strings ... " << endl )
00079     SSL_load_error_strings() ;
00080     BESDEBUG( "ppt", "OK" << endl )
00081 
00082     BESDEBUG( "ppt", "Initializing SSL library ... " << endl )
00083     SSL_library_init() ;
00084     BESDEBUG( "ppt", "OK" << endl )
00085 
00086 #if OPENSSL_VERSION_NUMBER < 0x10000000L
00087     SSL_METHOD *method = NULL ;
00088 #else
00089     const SSL_METHOD *method = NULL ;
00090 #endif
00091     SSL_CTX *context = NULL ;
00092     BESDEBUG( "ppt", "Creating method and context ... " << endl )
00093     method = SSLv3_server_method() ;
00094     if( method )
00095     {
00096         context = SSL_CTX_new( method ) ;
00097     }
00098     if( !context )
00099     {
00100         BESDEBUG( "ppt", "FAILED" << endl )
00101         string msg = "Failed to create SSL context\n" ;
00102         msg += ERR_error_string( ERR_get_error(), NULL ) ;
00103         throw BESInternalError( msg, __FILE__, __LINE__ ) ;
00104     }
00105     else
00106     {
00107         BESDEBUG( "ppt", "OK" << endl )
00108     }
00109 
00110     bool ok_2_continue = false ;
00111     string err_msg ;
00112 
00113     BESDEBUG( "ppt", "Setting certificate and key ... " << endl )
00114     if( SSL_CTX_use_certificate_file( context, _cfile.c_str(), SSL_FILETYPE_PEM ) <= 0 )
00115     {
00116         BESDEBUG( "ppt", "FAILED" << endl )
00117         err_msg = "FAILED to use certificate file " + _cfile + "\n" ;
00118         err_msg += ERR_error_string( ERR_get_error(), NULL ) ;
00119     }
00120     else if( SSL_CTX_use_PrivateKey_file( context, _kfile.c_str(), SSL_FILETYPE_PEM ) <= 0 )
00121     {
00122         BESDEBUG( "ppt", "FAILED" << endl )
00123         err_msg = "FAILED to use private key file " + _kfile + "\n" ;
00124         err_msg += ERR_error_string( ERR_get_error(), NULL ) ;
00125     }
00126     else if( !SSL_CTX_check_private_key( context ) )
00127     {
00128         BESDEBUG( "ppt", "FAILED" << endl )
00129         err_msg = "FAILED to authenticate private key\n" ;
00130         err_msg += ERR_error_string( ERR_get_error(), NULL ) ;
00131     }
00132     else
00133     {
00134         ok_2_continue = true ;
00135     }
00136 
00137     if( ok_2_continue )
00138     {
00139         BESDEBUG( "ppt", "OK" << endl )
00140         BESDEBUG( "ppt", "Certificate setup ... " << endl )
00141         SSL_CTX_set_verify( context, SSL_VERIFY_PEER, verify_client ) ;
00142         SSL_CTX_set_client_CA_list( context, SSL_load_client_CA_file( _cafile.c_str() ));
00143         if( ( !SSL_CTX_load_verify_locations( context, _cafile.c_str(), NULL )) ||
00144             ( !SSL_CTX_set_default_verify_paths( context ) ) )
00145         {
00146             BESDEBUG( "ppt", "FAILED" << endl )
00147             err_msg = "Certificate setup failed\n" ;
00148             err_msg += ERR_error_string( ERR_get_error(), NULL ) ;
00149             ok_2_continue = false ;
00150         }
00151     }
00152 
00153     int port_fd = -1 ;
00154     if( ok_2_continue )
00155     {
00156         BESDEBUG( "ppt", "OK" << endl )
00157 
00158         BESDEBUG( "ppt", "Opening port " << _port << "... " << endl )
00159         port_fd = open_port( ) ;
00160         if( port_fd < 0 )
00161         {
00162             BESDEBUG( "ppt", "FAILED" << endl )
00163             err_msg = "Failed to open port: " ;
00164 #ifdef HAVE_SYS_ERRLIST
00165             err_msg += sys_errlist[errno] ;
00166 #else
00167             err_msg += strerror( errno ) ;
00168 #endif
00169             ok_2_continue = false ;
00170         }
00171     }
00172 
00173     int sock_fd = -1 ;
00174     if( ok_2_continue )
00175     {
00176         BESDEBUG( "ppt", "OK" << endl )
00177 
00178         BESDEBUG( "ppt", "Waiting for client connection ... " << endl )
00179         sock_fd = accept( port_fd, NULL, NULL ) ;
00180         if( sock_fd < 0 )
00181         {
00182             BESDEBUG( "ppt", "FAILED" << endl )
00183             err_msg = "Failed to accept connection: " ;
00184 #ifdef HAVE_SYS_ERRLIST
00185             err_msg += sys_errlist[errno] ;
00186 #else
00187             err_msg += strerror( errno ) ;
00188 #endif
00189             ok_2_continue = false ;
00190         }
00191     }
00192 
00193     if( ok_2_continue )
00194     {
00195         BESDEBUG( "ppt", "OK" << endl )
00196 
00197         BESDEBUG( "ppt", "Establishing secure connection ... " << endl )
00198         int ssl_ret = 0 ;
00199         _connection = SSL_new( context ) ;
00200         if( !_connection )
00201         {
00202             err_msg =  "FAILED to create new connection\n" ;
00203             err_msg += ERR_error_string( ERR_get_error(), NULL ) ;
00204             ok_2_continue = false ;
00205         }
00206         else if( SSL_set_fd( _connection, sock_fd ) < 0 )
00207         {
00208             err_msg = "FAILED to set the socket descriptor\n" ;
00209             err_msg += ERR_error_string( ERR_get_error(), NULL ) ;
00210             ok_2_continue = false ;
00211         }
00212         else if( ( ssl_ret = SSL_accept( _connection ) ) < 0 )
00213         {
00214             err_msg = "FAILED to create SSL connection\n" ;
00215             err_msg += ERR_error_string( SSL_get_error( _connection, ssl_ret ), NULL ) ;
00216             ok_2_continue = false ;
00217         }
00218         else if( verify_connection( ) < 0 )
00219         {
00220             err_msg = "FAILED to verify SSL connection\n" ;
00221             err_msg += ERR_error_string( ERR_get_error(), NULL ) ;
00222             ok_2_continue = false ;
00223         }
00224     }
00225 
00226     if( ok_2_continue )
00227     {
00228         BESDEBUG( "ppt", "OK" << endl )
00229     }
00230     else
00231     {
00232         BESDEBUG( "ppt", "FAILED" << endl )
00233         if( _context ) SSL_CTX_free( _context ) ; _context = NULL ;
00234         throw BESInternalError( err_msg, __FILE__, __LINE__ ) ;
00235     }
00236 
00237     _connected = true ;
00238 }
00239 
00240 int
00241 SSLServer::open_port( )
00242 {
00243     int fd = -1 ;
00244     struct sockaddr_in addr ;
00245     int on = 1 ;
00246 
00247     fd = socket( PF_INET, SOCK_STREAM, 0 ) ;
00248     if( fd < 0 ) return fd ;
00249 
00250     setsockopt( fd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof( on ) ) ;
00251 
00252     memset( &addr, 0, sizeof( addr ) ) ;
00253     addr.sin_family = AF_INET ;
00254     addr.sin_addr.s_addr = INADDR_ANY ;
00255     addr.sin_port = htons( _port ) ;
00256 
00257     if( bind( fd, (struct sockaddr *)&addr, sizeof( addr ) ) < 0 )
00258     {
00259         close( fd ) ;
00260         return -1 ;
00261     }
00262     if( listen( fd, SOMAXCONN ) < 0 )
00263     {
00264         close( fd ) ;
00265         return -1 ;
00266     }
00267 
00268     return fd ;
00269 }
00270 
00271 int
00272 SSLServer::verify_connection( )
00273 {
00274     X509 *server_cert = NULL ;
00275     char *str = NULL ;
00276 
00277     /*
00278     server_cert = SSL_get_peer_certificate( _connection ) ;
00279     if( server_cert == NULL )
00280     {
00281         cout << "server doesn't have a certificate" << endl ;
00282     }
00283     */
00284 
00285     return 1 ;
00286 }
00287 
00288 int
00289 SSLServer::verify_client( int ok, X509_STORE_CTX *ctx )
00290 {
00291     if( ok )
00292     {
00293         BESDEBUG( "ppt", "VERIFIED " << endl )
00294         X509 *user_cert = X509_STORE_CTX_get_current_cert( ctx ) ;
00295         // FIX: Need to save this certificate somewhere, right?
00296     }
00297     else
00298     {
00299         char mybuf[256] ;
00300         X509 *err_cert ;
00301         int err ;
00302 
00303         err_cert = X509_STORE_CTX_get_current_cert( ctx ) ;
00304         err = X509_STORE_CTX_get_error( ctx ) ;
00305         X509_NAME_oneline( X509_get_subject_name( err_cert ), mybuf, 256 ) ;
00306         BESDEBUG( "ppt", "FAILED for " << mybuf << endl )
00307         BESDEBUG( "ppt", "  " << X509_verify_cert_error_string( err ) << endl )
00308         switch( ctx->error )
00309         {
00310             case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
00311             {
00312                 X509_NAME_oneline( X509_get_issuer_name( err_cert ), mybuf, 256 ) ;
00313                 BESDEBUG( "ppt", "  issuer = " << mybuf << endl )
00314                 break ;
00315             }
00316 
00317             case X509_V_ERR_CERT_NOT_YET_VALID:
00318             case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
00319             {
00320                 BESDEBUG( "ppt", "  not yet valid!" << endl )
00321                 break ;
00322             }
00323 
00324             case X509_V_ERR_CERT_HAS_EXPIRED:
00325             case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
00326             {
00327                 BESDEBUG( "ppt", "  expired!" << endl )
00328                 break ;
00329             }
00330             default:
00331             {
00332                 BESDEBUG( "ppt", "  unknown!" << endl )
00333                 break ;
00334             }
00335         }
00336     }
00337 
00338     return 1 ;
00339 }
00340 
00347 void
00348 SSLServer::dump( ostream &strm ) const
00349 {
00350     strm << BESIndent::LMarg << "SSLServer::dump - ("
00351                              << (void *)this << ")" << endl ;
00352     BESIndent::Indent() ;
00353     strm << BESIndent::LMarg << "port: " << _port << endl ;
00354     strm << BESIndent::LMarg << "cert file: " << _cfile << endl ;
00355     strm << BESIndent::LMarg << "cert authority file: " << _cafile << endl ;
00356     strm << BESIndent::LMarg << "key file: " << _kfile << endl ;
00357     SSLConnection::dump( strm ) ;
00358     BESIndent::UnIndent() ;
00359 }
00360 

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