/**
* sends TS Request and receives an answer in following definition
*
* <p>The TimeStampResp ASN.1 type definition:
*
* <pre>
*
* TimeStampResp ::= SEQUENCE {
* status PKIStatusInfo,
* timeStampToken TimeStampToken OPTIONAL ]
*
* PKIStatusInfo ::= SEQUENCE {
* status PKIStatus,
* statusString PKIFreeText OPTIONAL,
* failInfo PKIFailureInfo OPTIONAL }
*
* PKIStatus ::= INTEGER {
* granted (0),
* -- when the PKIStatus contains the value zero a TimeStampToken, as
* -- requested, is present.
* grantedWithMods (1),
* -- when the PKIStatus contains the value one a TimeStampToken,
* -- with modifications, is present.
* rejection (2),
* waiting (3),
* revocationWarning (4),
* -- this message contains a warning that a revocation is
* -- imminent
* revocationNotification (5)
* -- notification that a revocation has occurred }
*
* PKIFreeText ::= SEQUENCE SIZE (1..MAX) OF UTF8String
* -- text encoded as UTF-8 String (note: each UTF8String SHOULD
* -- include an RFC 1766 language tag to indicate the language
* -- of the contained text)
*
* PKIFailureInfo ::= BIT STRING {
* badAlg (0),
* -- unrecognized or unsupported Algorithm Identifier
* badRequest (2),
* -- transaction not permitted or supported
* badDataFormat (5),
* -- the data submitted has the wrong format
* timeNotAvailable (14),
* -- the TSA's time source is not available
* unacceptedPolicy (15),
* -- the requested TSA policy is not supported by the TSA
* unacceptedExtension (16),
* -- the requested extension is not supported by the TSA
* addInfoNotAvailable (17)
* -- the additional information requested could not be understood
* -- or is not available
* systemFailure (25)
* -- the request cannot be handled due to system failure }
*
* TimeStampToken ::= ContentInfo
* -- contentType is id-signedData
* -- content is SignedData
* -- eContentType within SignedData is id-ct-TSTInfo
* -- eContent within SignedData is TSTInfo
*
* </pre>
*
* @param tsq TimeStamp Request to be sent to TSA
* @param server complete URL of the TSA server
* @return TimeStamp Response created from TSA's response
*/
private TimeStampResponse getTSResponse(TimeStampRequest tsq, String server)
throws IOException, TSPException {
logger.trace("entering getTSResponse() method");
logger.entry(tsq, server);
final byte[] request = tsq.getEncoded();
// open valid connection
HttpURLConnection con;
try {
URL url = new URL(server);
con = (HttpURLConnection) url.openConnection();
} catch (IOException e) {
logger.error("TSA server couldn't be contacted");
throw e;
}
con.setDoOutput(true);
con.setDoInput(true);
con.setRequestProperty("Content-type", "application/timestamp-query");
// con.setRequestProperty("Content-length", String.valueOf(request.length));
logger.info("TSA server was successfully contacted");
// send request
OutputStream out;
try {
out = con.getOutputStream();
out.write(request);
out.flush();
} catch (IOException e) {
logger.error("Failed to send the TS request.");
throw e;
}
logger.debug("TS request sent");
// receive response
InputStream in;
TimeStampResp resp;
TimeStampResponse response;
try {
// verify connection status
if (con.getResponseCode() != HttpURLConnection.HTTP_OK) {
throw new IOException(
"Received HTTP error: " + con.getResponseCode() + " - " + con.getResponseMessage());
} else {
logger.debug("Response Code: {}", con.getResponseCode());
}
// accept the answer
in = con.getInputStream();
resp = TimeStampResp.getInstance(new ASN1InputStream(in).readObject());
response = new TimeStampResponse(resp);
// verify the answer
response.validate(tsq);
} catch (TSPException | IOException e) {
logger.error("Cannot interpret incoming data.");
throw e;
}
logger.debug("Status: {}", response.getStatusString()); // null means OK
return logger.exit(response);
}
public byte[] getTimeStampToken(byte[] digest)
throws NoSuchAlgorithmException, UnsupportedEncodingException, TSPException {
TimeStampRequestGenerator tsqGenerator = new TimeStampRequestGenerator();
tsqGenerator.setCertReq(true);
if (tsaOid != null) tsqGenerator.setReqPolicy(tsaOid);
TimeStampRequest tsReq =
tsqGenerator.generate(TSPAlgorithms.SHA1, digest, BigInteger.valueOf(100));
byte[] respBytes;
try {
byte[] requestBytes = tsReq.getEncoded();
URL url = new URL(tsaURL);
HttpsURLConnection tsaConnection = (HttpsURLConnection) url.openConnection();
String user_pass = Base64.encodeToString((tsaUsername + ":" + tsaPassword).getBytes(), 0);
tsaConnection.setRequestProperty("Authorization", "Basic " + user_pass);
tsaConnection.setDoInput(true);
tsaConnection.setDoOutput(true);
tsaConnection.setUseCaches(false);
tsaConnection.setRequestProperty("Content-Type", "application/timestamp-query");
tsaConnection.setRequestProperty("Content-Transfer-Encoding", "binary");
OutputStream out = tsaConnection.getOutputStream();
out.write(requestBytes);
out.close();
InputStream inp = tsaConnection.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = inp.read(buffer, 0, buffer.length)) >= 0) {
baos.write(buffer, 0, bytesRead);
}
respBytes = baos.toByteArray();
String encoding = tsaConnection.getContentEncoding();
if (encoding != null && encoding.equalsIgnoreCase("base64")) {
respBytes = Base64.decode(new String(respBytes), 0);
}
if (respBytes == null) {
String error = "Error: Impossible to get TSA response";
Log.e(TAG, error);
}
TimeStampResponse tsRes = new TimeStampResponse(respBytes);
tsRes.validate(tsReq);
PKIFailureInfo failure = tsRes.getFailInfo();
int value = (failure == null) ? 0 : failure.intValue();
if (value != 0) {
String error = "Error: Invalid TSA response (" + tsRes.getStatusString() + ")";
Log.e(TAG, error);
return null;
}
TimeStampToken myTSToken = tsRes.getTimeStampToken();
if (myTSToken == null) {
String error = "Error: Invalid TSA response (NULL)";
Log.e(TAG, error);
return null;
}
return myTSToken.getEncoded();
} catch (IOException | TSPException e) {
Log.e(TAG, e.getMessage());
}
return null;
}
public byte[] timeStamp(byte[] data, RevocationData revocationData) throws Exception {
// digest the message
MessageDigest messageDigest = MessageDigest.getInstance(this.digestAlgo);
byte[] digest = messageDigest.digest(data);
// generate the TSP request
BigInteger nonce = new BigInteger(128, new SecureRandom());
TimeStampRequestGenerator requestGenerator = new TimeStampRequestGenerator();
requestGenerator.setCertReq(true);
if (null != this.requestPolicy) {
requestGenerator.setReqPolicy(this.requestPolicy);
}
TimeStampRequest request = requestGenerator.generate(this.digestAlgoOid, digest, nonce);
byte[] encodedRequest = request.getEncoded();
// create the HTTP client
HttpClient httpClient = new HttpClient();
if (null != this.username) {
Credentials credentials = new UsernamePasswordCredentials(this.username, this.password);
httpClient.getState().setCredentials(AuthScope.ANY, credentials);
}
if (null != this.proxyHost) {
httpClient.getHostConfiguration().setProxy(this.proxyHost, this.proxyPort);
}
// create the HTTP POST request
PostMethod postMethod = new PostMethod(this.tspServiceUrl);
RequestEntity requestEntity =
new ByteArrayRequestEntity(encodedRequest, "application/timestamp-query");
postMethod.addRequestHeader("User-Agent", this.userAgent);
postMethod.setRequestEntity(requestEntity);
// invoke TSP service
int statusCode = httpClient.executeMethod(postMethod);
if (HttpStatus.SC_OK != statusCode) {
LOG.error("Error contacting TSP server " + this.tspServiceUrl);
throw new Exception("Error contacting TSP server " + this.tspServiceUrl);
}
// HTTP input validation
Header responseContentTypeHeader = postMethod.getResponseHeader("Content-Type");
if (null == responseContentTypeHeader) {
throw new RuntimeException("missing Content-Type header");
}
String contentType = responseContentTypeHeader.getValue();
if (!contentType.startsWith("application/timestamp-reply")) {
LOG.debug("response content: " + postMethod.getResponseBodyAsString());
throw new RuntimeException("invalid Content-Type: " + contentType);
}
if (0 == postMethod.getResponseContentLength()) {
throw new RuntimeException("Content-Length is zero");
}
// TSP response parsing and validation
InputStream inputStream = postMethod.getResponseBodyAsStream();
TimeStampResponse timeStampResponse = new TimeStampResponse(inputStream);
timeStampResponse.validate(request);
if (0 != timeStampResponse.getStatus()) {
LOG.debug("status: " + timeStampResponse.getStatus());
LOG.debug("status string: " + timeStampResponse.getStatusString());
PKIFailureInfo failInfo = timeStampResponse.getFailInfo();
if (null != failInfo) {
LOG.debug("fail info int value: " + failInfo.intValue());
if (PKIFailureInfo.unacceptedPolicy == failInfo.intValue()) {
LOG.debug("unaccepted policy");
}
}
throw new RuntimeException(
"timestamp response status != 0: " + timeStampResponse.getStatus());
}
TimeStampToken timeStampToken = timeStampResponse.getTimeStampToken();
SignerId signerId = timeStampToken.getSID();
BigInteger signerCertSerialNumber = signerId.getSerialNumber();
X500Principal signerCertIssuer = signerId.getIssuer();
LOG.debug("signer cert serial number: " + signerCertSerialNumber);
LOG.debug("signer cert issuer: " + signerCertIssuer);
// TSP signer certificates retrieval
CertStore certStore =
timeStampToken.getCertificatesAndCRLs("Collection", BouncyCastleProvider.PROVIDER_NAME);
Collection<? extends Certificate> certificates = certStore.getCertificates(null);
X509Certificate signerCert = null;
Map<String, X509Certificate> certificateMap = new HashMap<String, X509Certificate>();
for (Certificate certificate : certificates) {
X509Certificate x509Certificate = (X509Certificate) certificate;
if (signerCertIssuer.equals(x509Certificate.getIssuerX500Principal())
&& signerCertSerialNumber.equals(x509Certificate.getSerialNumber())) {
signerCert = x509Certificate;
}
String ski = Hex.encodeHexString(getSubjectKeyId(x509Certificate));
certificateMap.put(ski, x509Certificate);
LOG.debug(
"embedded certificate: " + x509Certificate.getSubjectX500Principal() + "; SKI=" + ski);
}
// TSP signer cert path building
if (null == signerCert) {
throw new RuntimeException("TSP response token has no signer certificate");
}
List<X509Certificate> tspCertificateChain = new LinkedList<X509Certificate>();
X509Certificate certificate = signerCert;
do {
LOG.debug("adding to certificate chain: " + certificate.getSubjectX500Principal());
tspCertificateChain.add(certificate);
if (certificate.getSubjectX500Principal().equals(certificate.getIssuerX500Principal())) {
break;
}
String aki = Hex.encodeHexString(getAuthorityKeyId(certificate));
certificate = certificateMap.get(aki);
} while (null != certificate);
// verify TSP signer signature
timeStampToken.validate(tspCertificateChain.get(0), BouncyCastleProvider.PROVIDER_NAME);
// verify TSP signer certificate
this.validator.validate(tspCertificateChain, revocationData);
LOG.debug("time-stamp token time: " + timeStampToken.getTimeStampInfo().getGenTime());
byte[] timestamp = timeStampToken.getEncoded();
return timestamp;
}