src/crypto/remoteSigner.cpp

   1 #include "remoteSigner.h"
   2 #include "util.h"
   3
   4 #include <iostream>
   5
   6 #include <openssl/ssl.h>
   7 #include <openssl/bn.h>
   8
   9 RemoteSigner::RemoteSigner( std::shared_ptr<BIO> target, std::shared_ptr<SSL_CTX> ctx ) {
  10     this->target = target;
  11     this->ctx = ctx;
  12 }
  13
  14 RemoteSigner::~RemoteSigner() {
  15 }
  16
  17 void RemoteSigner::send( std::shared_ptr<OpensslBIOWrapper> bio, RecordHeader& head, RecordHeader::SignerCommand cmd, std::string data ) {
  18     head.command = ( uint16_t ) cmd;
  19     head.command_count++;
  20     head.totalLength = data.size();
  21     sendCommand( head, data, bio, log );
  22
  23 }
  24
  25 std::shared_ptr<SignedCertificate> RemoteSigner::sign( std::shared_ptr<TBSCertificate> cert ) {
  26     ( void )BIO_reset( target.get() );
  27
  28     std::shared_ptr<SSL> ssl( SSL_new( ctx.get() ), SSL_free );
  29     std::shared_ptr<BIO> bio( BIO_new( BIO_f_ssl() ), BIO_free );
  30     SSL_set_connect_state( ssl.get() );
  31     SSL_set_bio( ssl.get(), target.get(), target.get() );
  32     BIO_set_ssl( bio.get(), ssl.get(), BIO_NOCLOSE );
  33     std::shared_ptr<OpensslBIOWrapper> conn( new OpensslBIOWrapper( bio ) );
  34     RecordHeader head;
  35     head.flags = 0;
  36     head.sessid = 13;
  37
  38     if( cert->csr_type == "CSR" ) {
  39         send( conn, head, RecordHeader::SignerCommand::SET_CSR, cert->csr_content );
  40     } else if( cert->csr_type == "SPKAC" ) {
  41         send( conn, head, RecordHeader::SignerCommand::SET_SPKAC, cert->csr_content );
  42     } else {
  43         std::cout << "Unknown csr_type: " << cert->csr_type;
  44         return std::shared_ptr<SignedCertificate>();
  45     }
  46
  47     send( conn, head, RecordHeader::SignerCommand::SET_SIGNATURE_TYPE, cert->md );
  48     send( conn, head, RecordHeader::SignerCommand::SET_PROFILE, cert->profile );
  49
  50     for( auto ava : cert->AVAs ) {
  51         if( ava->name.find( "," ) != std::string::npos ) {
  52             // invalid ava
  53             return std::shared_ptr<SignedCertificate>();
  54         }
  55
  56         send( conn, head, RecordHeader::SignerCommand::ADD_AVA, ava->name + "," + ava->value );
  57     }
  58
  59     for( auto san : cert->SANs ) {
  60         if( san->type.find( "," ) != std::string::npos ) {
  61             // invalid ava
  62             return std::shared_ptr<SignedCertificate>();
  63         }
  64
  65         send( conn, head, RecordHeader::SignerCommand::ADD_SAN, san->type + "," + san->content );
  66     }
  67
  68     send( conn, head, RecordHeader::SignerCommand::SIGN, "" );
  69     send( conn, head, RecordHeader::SignerCommand::LOG_SAVED, "" );
  70     std::shared_ptr<SignedCertificate> result = std::shared_ptr<SignedCertificate>( new SignedCertificate() );
  71     std::vector<char> buffer( 2048 * 4 );
  72
  73     for( int i = 0; i < 3; i++ ) {
  74         try {
  75             int length = conn->read( buffer.data(), buffer.size() );
  76
  77             if( length <= 0 ) {
  78                 std::cout << "Error, no response data" << std::endl;
  79                 result = std::shared_ptr<SignedCertificate>();
  80                 break;
  81             }
  82
  83             RecordHeader head;
  84             std::string payload = parseCommand( head, std::string( buffer.data(), length ), log );
  85
  86             switch( ( RecordHeader::SignerResult ) head.command ) {
  87             case RecordHeader::SignerResult::CERTIFICATE:
  88                 result->certificate = payload;
  89                 break;
  90
  91             case RecordHeader::SignerResult::SAVE_LOG:
  92                 result->log = payload;
  93                 break;
  94
  95             case RecordHeader::SignerResult::SIGNING_CA:
  96                 result->ca_name = payload;
  97                 break;
  98
  99             default:
 100                 std::cout << "Invalid Message" << std::endl;
 101                 break;
 102             }
 103         } catch( const char* msg ) {
 104             std::cout << msg << std::endl;
 105             return std::shared_ptr<SignedCertificate>();
 106         }
 107     }
 108
 109     if( result ) {
 110         std::shared_ptr<BIO> bios( BIO_new( BIO_s_mem() ), BIO_free );
 111         const char* buf = result->certificate.data();
 112         unsigned int len = result->certificate.size();
 113
 114         while( len > 0 ) {
 115             int dlen = BIO_write( bios.get(), buf, len );
 116
 117             if( dlen <= 0 ) {
 118                 throw "Memory error.";
 119             }
 120
 121             len -= dlen;
 122             buf += dlen;
 123         }
 124
 125         std::shared_ptr<X509> pem( PEM_read_bio_X509( bios.get(), NULL, 0, NULL ) );
 126
 127         if( !pem ) {
 128             throw "Pem was not readable";
 129         }
 130
 131         std::shared_ptr<BIGNUM> ser( ASN1_INTEGER_to_BN( pem->cert_info->serialNumber, NULL ), BN_free );
 132         std::shared_ptr<char> serStr(
 133             BN_bn2hex( ser.get() ),
 134             []( char* p ) {
 135                 OPENSSL_free( p );
 136             } ); // OPENSSL_free is a macro...
 137         result->serial = std::string( serStr.get() );
 138     }
 139
 140     if( !SSL_shutdown( ssl.get() ) && !SSL_shutdown( ssl.get() ) ) { // need to close the connection twice
 141         std::cout << "SSL shutdown failed" << std::endl;
 142     }
 143
 144     return result;
 145 }
 146
 147 std::pair<std::shared_ptr<CRL>, std::string> RemoteSigner::revoke( std::shared_ptr<CAConfig> ca, std::string serial ) {
 148     ( void )BIO_reset( target.get() );
 149
 150     std::shared_ptr<SSL> ssl( SSL_new( ctx.get() ), SSL_free );
 151     std::shared_ptr<BIO> bio( BIO_new( BIO_f_ssl() ), BIO_free );
 152     SSL_set_connect_state( ssl.get() );
 153     SSL_set_bio( ssl.get(), target.get(), target.get() );
 154     BIO_set_ssl( bio.get(), ssl.get(), BIO_NOCLOSE );
 155     std::shared_ptr<OpensslBIOWrapper> conn( new OpensslBIOWrapper( bio ) );
 156
 157     RecordHeader head;
 158     head.flags = 0;
 159     head.sessid = 13;
 160
 161     std::string payload = ca->name + std::string( "\0", 1 ) + serial;
 162     send( conn, head, RecordHeader::SignerCommand::REVOKE, payload );
 163
 164     std::vector<char> buffer( 2048 * 4 );
 165     int length = conn->read( buffer.data(), buffer.size() );
 166
 167     if( length <= 0 ) {
 168         std::cout << "Error, no response data" << std::endl;
 169         return std::pair<std::shared_ptr<CRL>, std::string>( std::shared_ptr<CRL>(), "" );
 170     }
 171
 172     payload = parseCommand( head, std::string( buffer.data(), length ), log );
 173
 174     std::shared_ptr<CRL> crl( new CRL( ca->path + std::string( "/ca.crl" ) ) );
 175
 176     switch( ( RecordHeader::SignerResult ) head.command ) {
 177     case RecordHeader::SignerResult::REVOKED: {
 178         const unsigned char* buffer2 = ( const unsigned char* ) payload.data();
 179         const unsigned char* pos = buffer2;
 180         ASN1_TIME* time = d2i_ASN1_TIME( NULL, &pos, payload.size() );
 181         ASN1_TIME_free( time );
 182         std::string rest = payload.substr( pos - buffer2 );
 183         crl->revoke( serial, payload.substr( 0, pos - buffer2 ) );
 184         crl->setSignature( rest );
 185         bool ok = crl->verify( ca );
 186
 187         if( ok ) {
 188             ( *log ) << "CRL verificated successfully" << std::endl;
 189             writeFile( ca->path + std::string( "/ca.crl" ), crl->toString() );
 190         } else {
 191             ( *log ) << "CRL is broken" << std::endl;
 192             send( conn, head, RecordHeader::SignerCommand::GET_FULL_CRL, ca->name );
 193             length = conn->read( buffer.data(), buffer.size() );
 194
 195             if( length <= 0 ) {
 196                 ( *log ) << "Error, no response data" << std::endl;
 197                 return std::pair<std::shared_ptr<CRL>, std::string>( std::shared_ptr<CRL>(), "" );
 198             }
 199
 200             payload = parseCommand( head, std::string( buffer.data(), length ), log );
 201             writeFile( ca->path + std::string( "/ca.crl.bak" ), payload );
 202             crl = std::shared_ptr<CRL>( new CRL( ca->path + std::string( "/ca.crl.bak" ) ) );
 203
 204             if( crl->verify( ca ) ) {
 205                 writeFile( ca->path + std::string( "/ca.crl" ), crl->toString() );
 206                 ( *log ) << "CRL is now valid" << std::endl;
 207             } else {
 208                 ( *log ) << "CRL is still broken... Please, help me" << std::endl;
 209             }
 210
 211         }
 212
 213         ( *log ) << "CRL: " << std::endl << crl->toString() << std::endl;
 214         break;
 215     }
 216
 217     default:
 218         throw "Invalid response command.";
 219     }
 220
 221
 222     if( !SSL_shutdown( ssl.get() ) && !SSL_shutdown( ssl.get() ) ) { // need to close the connection twice
 223         std::cout << "SSL shutdown failed" << std::endl;
 224     }
 225
 226     return std::pair<std::shared_ptr<CRL>, std::string>( std::shared_ptr<CRL>(), "" );
 227 }
 228
 229 void RemoteSigner::setLog( std::shared_ptr<std::ostream> target ) {
 230     this->log = target;
 231 }