src/remoteSigner.cpp

   1 #include "remoteSigner.h"
   2
   3 #include <iostream>
   4
   5 #include <openssl/ssl.h>
   6 #include <openssl/bn.h>
   7
   8 RemoteSigner::RemoteSigner( std::shared_ptr<BIO> target, std::shared_ptr<SSL_CTX> ctx ) {
   9     this->target = target;
  10     this->ctx = ctx;
  11 }
  12
  13 RemoteSigner::~RemoteSigner() {
  14 }
  15
  16 void RemoteSigner::send( std::shared_ptr<OpensslBIOWrapper> bio, RecordHeader& head, RecordHeader::SignerCommand cmd, std::string data ) {
  17     head.command = ( uint16_t ) cmd;
  18     head.command_count++;
  19     head.totalLength = data.size();
  20     sendCommand( head, data, bio, log );
  21
  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     std::shared_ptr<OpensslBIOWrapper> conn( new 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 {
  40         std::cout << "Unknown csr_type: " << cert->csr_type;
  41         return std::shared_ptr<SignedCertificate>();
  42     }
  43
  44     send( conn, head, RecordHeader::SignerCommand::SET_SIGNATURE_TYPE, cert->md );
  45     send( conn, head, RecordHeader::SignerCommand::SET_PROFILE, cert->profile );
  46
  47     for( auto ava : cert->AVAs ) {
  48         if( ava->name.find( "," ) != std::string::npos ) {
  49             // invalid ava
  50             return std::shared_ptr<SignedCertificate>();
  51         }
  52
  53         send( conn, head, RecordHeader::SignerCommand::ADD_AVA, ava->name + "," + ava->value );
  54     }
  55
  56     for( auto san : cert->SANs ) {
  57         if( san->type.find( "," ) != std::string::npos ) {
  58             // invalid ava
  59             return std::shared_ptr<SignedCertificate>();
  60         }
  61
  62         send( conn, head, RecordHeader::SignerCommand::ADD_SAN, san->type + "," + san->content );
  63     }
  64
  65     send( conn, head, RecordHeader::SignerCommand::SIGN, "" );
  66     send( conn, head, RecordHeader::SignerCommand::LOG_SAVED, "" );
  67     std::shared_ptr<SignedCertificate> result = std::shared_ptr<SignedCertificate>( new SignedCertificate() );
  68     std::vector<char> buffer( 2048 * 4 );
  69
  70     for( int i = 0; i < 2; i++ ) {
  71         try {
  72             int length = conn->read( buffer.data(), buffer.size() );
  73
  74             if( length <= 0 ) {
  75                 std::cout << "Error, no response data" << std::endl;
  76                 result = std::shared_ptr<SignedCertificate>();
  77                 break;
  78             }
  79
  80             RecordHeader head;
  81             std::string payload = parseCommand( head, std::string( buffer.data(), length ), log );
  82
  83             switch( ( RecordHeader::SignerResult ) head.command ) {
  84             case RecordHeader::SignerResult::CERTIFICATE:
  85                 result->certificate = payload;
  86                 break;
  87
  88             case RecordHeader::SignerResult::SAVE_LOG:
  89                 result->log = payload;
  90                 break;
  91             }
  92         } catch( const char* msg ) {
  93             std::cout << msg << std::endl;
  94             return std::shared_ptr<SignedCertificate>();
  95         }
  96     }
  97
  98     if( result ) {
  99         std::shared_ptr<BIO> bios( BIO_new( BIO_s_mem() ), BIO_free );
 100         const char* buf = result->certificate.data();
 101         unsigned int len = result->certificate.size();
 102
 103         while( len > 0 ) {
 104             int dlen = BIO_write( bios.get(), buf, len );
 105
 106             if( dlen <= 0 ) {
 107                 throw "Memory error.";
 108             }
 109
 110             len -= dlen;
 111             buf += dlen;
 112         }
 113
 114         std::shared_ptr<X509> pem( PEM_read_bio_X509( bios.get(), NULL, 0, NULL ) );
 115
 116         if( !pem ) {
 117             throw "Pem was not readable";
 118         }
 119
 120         std::shared_ptr<BIGNUM> ser( ASN1_INTEGER_to_BN( pem->cert_info->serialNumber, NULL ), BN_free );
 121         std::shared_ptr<char> serStr(
 122             BN_bn2hex( ser.get() ),
 123             []( char* p ) {
 124                 OPENSSL_free( p );
 125             } ); // OPENSSL_free is a macro...
 126         result->serial = std::string( serStr.get() );
 127     }
 128
 129     if( !SSL_shutdown( ssl.get() ) && !SSL_shutdown( ssl.get() ) ) { // need to close the connection twice
 130         std::cout << "SSL shutdown failed" << std::endl;
 131     }
 132
 133     return result;
 134 }
 135
 136 void RemoteSigner::setLog( std::shared_ptr<std::ostream> target ) {
 137     this->log = target;
 138 }