src/crypto/remoteSigner.cpp

   1 #include "remoteSigner.h"
   2
   3 #include "log/logger.hpp"
   4 #include "util.h"
   5
   6 #include <iostream>
   7
   8 #include <openssl/ssl.h>
   9 #include <openssl/bn.h>
  10
  11 RemoteSigner::RemoteSigner( std::shared_ptr<BIO> target, std::shared_ptr<SSL_CTX> ctx ) : target( target ), 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 = static_cast<uint16_t>( cmd );
  19     head.command_count++;
  20     head.totalLength = data.size();
  21     sendCommand( head, data, bio );
  22 }
  23
  24 std::shared_ptr<SignedCertificate> RemoteSigner::sign( std::shared_ptr<TBSCertificate> cert ) {
  25     ( void )BIO_reset( target.get() );
  26
  27     std::shared_ptr<SSL> ssl( SSL_new( ctx.get() ), SSL_free );
  28     std::shared_ptr<BIO> bio( BIO_new( BIO_f_ssl() ), BIO_free );
  29     SSL_set_connect_state( ssl.get() );
  30     SSL_set_bio( ssl.get(), target.get(), target.get() );
  31     BIO_set_ssl( bio.get(), ssl.get(), BIO_NOCLOSE );
  32     auto conn = std::make_shared<OpensslBIOWrapper>( bio );
  33     RecordHeader head;
  34     head.flags = 0;
  35     head.sessid = 13;
  36
  37     if( cert->csr_type == "CSR" ) {
  38         send( conn, head, RecordHeader::SignerCommand::SET_CSR, cert->csr_content );
  39     } else if( cert->csr_type == "SPKAC" ) {
  40         send( conn, head, RecordHeader::SignerCommand::SET_SPKAC, cert->csr_content );
  41     } else {
  42         logger::error( "Unknown csr_type: ", cert->csr_type );
  43         return nullptr;
  44     }
  45
  46     send( conn, head, RecordHeader::SignerCommand::SET_SIGNATURE_TYPE, cert->md );
  47     send( conn, head, RecordHeader::SignerCommand::SET_PROFILE, cert->profile );
  48     send( conn, head, RecordHeader::SignerCommand::SET_WISH_FROM, cert->wishFrom );
  49     send( conn, head, RecordHeader::SignerCommand::SET_WISH_TO, cert->wishTo );
  50
  51     for( auto &ava : cert->AVAs ) {
  52         if( ava->name.find( "," ) != std::string::npos ) {
  53             // invalid ava
  54             return nullptr;
  55         }
  56
  57         send( conn, head, RecordHeader::SignerCommand::ADD_AVA, ava->name + "," + ava->value );
  58     }
  59
  60     for( auto &san : cert->SANs ) {
  61         if( san->type.find( "," ) != std::string::npos ) {
  62             // invalid ava
  63             return nullptr;
  64         }
  65
  66         send( conn, head, RecordHeader::SignerCommand::ADD_SAN, san->type + "," + san->content );
  67     }
  68
  69     send( conn, head, RecordHeader::SignerCommand::SIGN, "" );
  70     send( conn, head, RecordHeader::SignerCommand::LOG_SAVED, "" );
  71     auto result = std::make_shared<SignedCertificate>();
  72
  73     for( int i = 0; i < 3; i++ ) {
  74         try {
  75             RecordHeader head;
  76             std::string payload = parseCommand( head, conn->readLine() );
  77
  78             switch( static_cast<RecordHeader::SignerResult>( head.command )) {
  79             case RecordHeader::SignerResult::CERTIFICATE:
  80                 result->certificate = payload;
  81                 break;
  82
  83             case RecordHeader::SignerResult::SAVE_LOG:
  84                 result->log = payload;
  85                 break;
  86
  87             case RecordHeader::SignerResult::SIGNING_CA:
  88                 result->ca_name = payload;
  89                 break;
  90
  91             default:
  92                 logger::error( "Invalid Message" );
  93                 break;
  94             }
  95         } catch( const char* msg ) {
  96             logger::error( msg );
  97             return std::shared_ptr<SignedCertificate>();
  98         }
  99     }
 100
 101     if( result ) {
 102         std::shared_ptr<BIO> bios( BIO_new( BIO_s_mem() ), BIO_free );
 103         const char* buf = result->certificate.data();
 104         unsigned int len = result->certificate.size();
 105
 106         while( len > 0 ) {
 107             int dlen = BIO_write( bios.get(), buf, len );
 108
 109             if( dlen <= 0 ) {
 110                 throw "Memory error.";
 111             }
 112
 113             len -= dlen;
 114             buf += dlen;
 115         }
 116
 117         std::shared_ptr<X509> pem( PEM_read_bio_X509( bios.get(), NULL, 0, NULL ) );
 118
 119         if( !pem ) {
 120             throw "Pem was not readable";
 121         }
 122
 123         std::shared_ptr<BIGNUM> ser( ASN1_INTEGER_to_BN( pem->cert_info->serialNumber, NULL ), BN_free );
 124         std::shared_ptr<char> serStr(
 125             BN_bn2hex( ser.get() ),
 126             []( char* p ) {
 127                 OPENSSL_free( p );
 128             } ); // OPENSSL_free is a macro...
 129
 130         extractTimes( pem, result );
 131
 132         result->serial = std::string( serStr.get() );
 133     }
 134
 135     logger::note( "Closing SSL connection" );
 136     if( !SSL_shutdown( ssl.get() ) && !SSL_shutdown( ssl.get() ) ) { // need to close the connection twice
 137         logger::warn( "SSL shutdown failed" );
 138     }
 139     logger::note( "SSL connection closed" );
 140
 141     return result;
 142 }
 143
 144 std::pair<std::shared_ptr<CRL>, std::string> RemoteSigner::revoke( std::shared_ptr<CAConfig> ca, std::vector<std::string> serials ) {
 145     ( void )BIO_reset( target.get() );
 146
 147     std::shared_ptr<SSL> ssl( SSL_new( ctx.get() ), SSL_free );
 148     std::shared_ptr<BIO> bio( BIO_new( BIO_f_ssl() ), BIO_free );
 149     SSL_set_connect_state( ssl.get() );
 150     SSL_set_bio( ssl.get(), target.get(), target.get() );
 151     BIO_set_ssl( bio.get(), ssl.get(), BIO_NOCLOSE );
 152     auto conn = std::make_shared<OpensslBIOWrapper>( bio );
 153
 154     RecordHeader head;
 155     head.flags = 0;
 156     head.sessid = 13;
 157
 158     for( auto &serial : serials ) {
 159         send( conn, head, RecordHeader::SignerCommand::ADD_SERIAL, serial );
 160     }
 161
 162     std::string payload = ca->name;
 163     send( conn, head, RecordHeader::SignerCommand::REVOKE, payload );
 164
 165     payload = parseCommand( head, conn->readLine() );
 166
 167     auto crl = std::make_shared<CRL>( ca->path + std::string( "/ca.crl" ) );
 168     std::string date;
 169
 170     if( static_cast<RecordHeader::SignerResult>( head.command ) != RecordHeader::SignerResult::REVOKED ) {
 171         throw "Protocol violation";
 172     }
 173
 174     const unsigned char* buffer2 = reinterpret_cast<const unsigned char*>( payload.data() );
 175     const unsigned char* pos = buffer2;
 176     ASN1_TIME* time = d2i_ASN1_TIME( NULL, &pos, payload.size() );
 177     ASN1_TIME_free( time );
 178     date = payload.substr( 0, pos - buffer2 );
 179     std::string rest = payload.substr( pos - buffer2 );
 180
 181     for( std::string &serial : serials ) {
 182         crl->revoke( serial, date );
 183     }
 184
 185     crl->setSignature( rest );
 186     bool ok = crl->verify( ca );
 187
 188     if( ok ) {
 189         logger::note( "CRL verificated successfully" );
 190         writeFile( ca->path + std::string( "/ca.crl" ), crl->toString() );
 191     } else {
 192         logger::warn( "CRL is broken, trying to recover" );
 193         send( conn, head, RecordHeader::SignerCommand::GET_FULL_CRL, ca->name );
 194
 195         payload = parseCommand( head, conn->readLine() );
 196
 197         if( static_cast<RecordHeader::SignerResult>( head.command ) != RecordHeader::SignerResult::FULL_CRL ) {
 198             throw "Protocol violation";
 199         }
 200
 201         writeFile( ca->path + std::string( "/ca.crl.bak" ), payload );
 202         crl = std::make_shared<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             logger::note( "CRL is now valid again" );
 207         } else {
 208             logger::warn( "CRL is still broken... Please, help me" );
 209         }
 210     }
 211
 212     logger::debug( "CRL:\n", crl->toString() );
 213
 214     logger::note( "Closing SSL connection" );
 215     if( !SSL_shutdown( ssl.get() ) && !SSL_shutdown( ssl.get() ) ) { // need to close the connection twice
 216         logger::warn( "SSL shutdown failed" );
 217     }
 218     logger::note( "SSL connection closed" );
 219
 220     return { crl, date };
 221 }
 222
 223 void RemoteSigner::setLog( std::shared_ptr<std::ostream> target ) {
 224     this->log = target;
 225 }