static off_t get_sig_offset(xar_t x) {
off_t signedDataOffset = 0;
xar_signature_t sig = xar_signature_first(x);
xar_signature_copy_signed_data(sig,NULL,NULL,NULL,NULL,&signedDataOffset);
signedDataOffset += xar_get_heap_offset(x);
return signedDataOffset;
}
bool InstallChecker::verifyPackage( const QString &filePath, bool )
{
QProcess proc;
proc.start( "hdiutil", QStringList() << "verify" << filePath );
proc.waitForFinished();
if( proc.exitCode() )
return false;
QString path = mountPackage( filePath );
if( path.isEmpty() )
return false;
xar_t xar = xar_open( path.toUtf8().constData(), 0 );
if( !xar )
return false;
QSslCertificate cert;
xar_signature_t sig = xar_signature_first( xar );
int32_t count = xar_signature_get_x509certificate_count( sig );
for( int32_t i = 0; i < count; ++i )
{
uint32_t size = 0;
const uint8_t *data = 0;
if( xar_signature_get_x509certificate_data( sig, i, &data, &size ) )
continue;
QSslCertificate c( QByteArray( (const char*)data, size ), QSsl::Der );
#if QT_VERSION >= 0x050000
QString cn = c.subjectInfo( QSslCertificate::CommonName ).value(0);
#else
QString cn = c.subjectInfo( QSslCertificate::CommonName );
#endif
if( cn == "Estonian Informatics Centre" ||
cn == "Developer ID Installer: Riigi Infosüsteemi Amet" )
cert = c;
}
if( cert.isNull() )
{
xar_close( xar );
return false;
}
uint8_t *data = 0, *signature = 0;
uint32_t dataSize = 0, signatureSize = 0;
off_t offset = 0;
if( xar_signature_copy_signed_data( sig, &data, &dataSize, &signature, &signatureSize, &offset ) )
{
xar_close( xar );
return false;
}
int result = RSA_verify( NID_sha1, data, dataSize, signature, signatureSize, (RSA*)cert.publicKey().handle() );
xar_close( xar );
free( data );
free( signature );
return result;
}
static void extract_data_to_sign(const char *filename) {
xar_signature_t sig;
off_t signatureOffset;
FILE *file;
xar_t x;
int i;
uint32_t dataToSignOffset = 0;
uint32_t dataToSignSize = 0;
char *buffer = NULL;
const char *value;
// find signature stub
x = xar_open(filename, READ);
if ( x == NULL ) {
fprintf(stderr, "Could not open %s to extract data to sign!\n", filename);
exit(1);
}
sig = xar_signature_first(x);
if ( !sig ) {
fprintf(stderr, "No signatures found to extract data from.\n");
exit(E_NOSIG);
}
// locate data to sign
if( 0 != xar_prop_get((xar_file_t)x, "checksum/offset" ,&value) ){
fprintf(stderr, "Could not locate checksum/offset in archive.\n");
exit(1);
}
dataToSignOffset = xar_get_heap_offset(x);
dataToSignOffset += strtoull(value, (char **)NULL, 10);
if( 0 != xar_prop_get((xar_file_t)x, "checksum/size" ,&value) ){
fprintf(stderr, "Could not locate checksum/size in archive.\n");
exit(1);
}
dataToSignSize = strtoull(value, (char **)NULL, 10);
// get signature offset (inject signature here)
xar_signature_copy_signed_data(sig, NULL, NULL, NULL, NULL, &signatureOffset);
signatureOffset += xar_get_heap_offset(x);
xar_close(x);
// now get data to be signed, using offset and size
file = fopen(filename, "r");
if (!file) {
fprintf(stderr, "Could not open %s for reading data to sign!\n", filename);
exit(1);
}
fseek(file, dataToSignOffset, SEEK_SET);
buffer = malloc(dataToSignSize);
i = fread(buffer, dataToSignSize, 1, file);
if (i != 1) {
fprintf(stderr, "Failed to read data to sign from %s!\n", filename);
exit(1);
}
fclose(file);
// save data to sign
file = fopen(DataToSignDumpPath, "w");
if (!file) {
fprintf(stderr, "Could not open %s for saving data to sign!\n", DataToSignDumpPath);
exit(1);
}
i = fwrite(buffer, dataToSignSize, 1, file);
if (i != 1) {
fprintf(stderr, "Failed to write data to sign to %s (fwrite() returned %i)!\n", DataToSignDumpPath, i);
exit(1);
}
fclose(file);
// save signature offset
file = fopen(SigOffsetDumpPath, "w");
if (!file) {
fprintf(stderr, "Could not open %s for saving signature offset!\n", SigOffsetDumpPath);
exit(1);
}
i = fprintf(file, "%lli\n", signatureOffset);
if (i < 0) {
fprintf(stderr, "Failed to write signature offset to %s (fprintf() returned %i)!\n", SigOffsetDumpPath, i);
exit(1);
}
fclose(file);
free(buffer);
}