/**
* Create a new user ID token from the provided JSON object. The associated master token must be
* provided to verify the user ID token.
*
* @param ctx MSL context.
* @param userIdTokenJO user ID token JSON object.
* @param masterToken the master token.
* @throws MslEncodingException if there is an error parsing the JSON, the token data is missing
* or invalid, or the signature is invalid.
* @throws MslCryptoException if there is an error verifying the token data.
* @throws MslException if the user ID token master token serial number does not match the master
* token serial number, or the expiration timestamp occurs before the renewal window, or the
* user data is missing or invalid, or the user ID token master token serial number is out of
* range, or the user ID token serial number is out of range.
*/
public UserIdToken(
final MslContext ctx, final JSONObject userIdTokenJO, final MasterToken masterToken)
throws MslEncodingException, MslCryptoException, MslException {
this.ctx = ctx;
// Grab the crypto context.
final ICryptoContext cryptoContext = ctx.getMslCryptoContext();
// Verify the JSON representation.
try {
try {
tokendata = Base64.decode(userIdTokenJO.getString(KEY_TOKENDATA));
} catch (final IllegalArgumentException e) {
throw new MslEncodingException(
MslError.USERIDTOKEN_TOKENDATA_INVALID,
"useridtoken " + userIdTokenJO.toString(),
e)
.setMasterToken(masterToken);
}
if (tokendata == null || tokendata.length == 0)
throw new MslEncodingException(
MslError.USERIDTOKEN_TOKENDATA_MISSING, "useridtoken " + userIdTokenJO.toString())
.setMasterToken(masterToken);
try {
signature = Base64.decode(userIdTokenJO.getString(KEY_SIGNATURE));
} catch (final IllegalArgumentException e) {
throw new MslEncodingException(
MslError.USERIDTOKEN_SIGNATURE_INVALID,
"useridtoken " + userIdTokenJO.toString(),
e)
.setMasterToken(masterToken);
}
verified = cryptoContext.verify(tokendata, signature);
} catch (final JSONException e) {
throw new MslEncodingException(
MslError.JSON_PARSE_ERROR, "useridtoken " + userIdTokenJO.toString(), e)
.setMasterToken(masterToken);
}
// Pull the token data.
final String tokenDataJson = new String(tokendata, MslConstants.DEFAULT_CHARSET);
try {
final JSONObject tokenDataJO = new JSONObject(tokenDataJson);
renewalWindow = tokenDataJO.getLong(KEY_RENEWAL_WINDOW);
expiration = tokenDataJO.getLong(KEY_EXPIRATION);
if (expiration < renewalWindow)
throw new MslException(
MslError.USERIDTOKEN_EXPIRES_BEFORE_RENEWAL, "usertokendata " + tokenDataJson)
.setMasterToken(masterToken);
mtSerialNumber = tokenDataJO.getLong(KEY_MASTER_TOKEN_SERIAL_NUMBER);
if (mtSerialNumber < 0 || mtSerialNumber > MslConstants.MAX_LONG_VALUE)
throw new MslException(
MslError.USERIDTOKEN_MASTERTOKEN_SERIAL_NUMBER_OUT_OF_RANGE,
"usertokendata " + tokenDataJson)
.setMasterToken(masterToken);
serialNumber = tokenDataJO.getLong(KEY_SERIAL_NUMBER);
if (serialNumber < 0 || serialNumber > MslConstants.MAX_LONG_VALUE)
throw new MslException(
MslError.USERIDTOKEN_SERIAL_NUMBER_OUT_OF_RANGE, "usertokendata " + tokenDataJson)
.setMasterToken(masterToken);
final byte[] ciphertext;
try {
ciphertext = Base64.decode(tokenDataJO.getString(KEY_USERDATA));
} catch (final IllegalArgumentException e) {
throw new MslException(
MslError.USERIDTOKEN_USERDATA_INVALID, tokenDataJO.getString(KEY_USERDATA))
.setMasterToken(masterToken);
}
if (ciphertext == null || ciphertext.length == 0)
throw new MslException(
MslError.USERIDTOKEN_USERDATA_MISSING, tokenDataJO.getString(KEY_USERDATA))
.setMasterToken(masterToken);
userdata = (verified) ? cryptoContext.decrypt(ciphertext) : null;
} catch (final JSONException e) {
throw new MslEncodingException(
MslError.USERIDTOKEN_TOKENDATA_PARSE_ERROR, "usertokendata " + tokenDataJson, e)
.setMasterToken(masterToken);
} catch (final MslCryptoException e) {
e.setMasterToken(masterToken);
throw e;
}
// Pull the user data.
if (userdata != null) {
final String userDataJson = new String(userdata, MslConstants.DEFAULT_CHARSET);
try {
final JSONObject userDataJO = new JSONObject(userDataJson);
issuerData =
(userDataJO.has(KEY_ISSUER_DATA)) ? userDataJO.getJSONObject(KEY_ISSUER_DATA) : null;
final String identity = userDataJO.getString(KEY_IDENTITY);
if (identity == null || identity.length() == 0)
throw new MslException(MslError.USERIDTOKEN_IDENTITY_INVALID, "userdata " + userDataJson)
.setMasterToken(masterToken);
final TokenFactory factory = ctx.getTokenFactory();
user = factory.createUser(ctx, identity);
if (user == null)
throw new MslInternalException(
"TokenFactory.createUser() returned null in violation of the interface contract.");
} catch (final JSONException e) {
throw new MslEncodingException(
MslError.USERIDTOKEN_USERDATA_PARSE_ERROR, "userdata " + userDataJson, e)
.setMasterToken(masterToken);
}
} else {
issuerData = null;
user = null;
}
// Verify serial numbers.
if (masterToken == null || this.mtSerialNumber != masterToken.getSerialNumber())
throw new MslException(
MslError.USERIDTOKEN_MASTERTOKEN_MISMATCH,
"uit mtserialnumber " + this.mtSerialNumber + "; mt " + masterToken)
.setMasterToken(masterToken);
}
/**
* Return the crypto context resulting from key response data contained in the provided header.
*
* <p>The {@link MslException}s thrown by this method will not have the entity or user set.
*
* @param ctx MSL context.
* @param header header.
* @param keyRequestData key request data for key exchange.
* @return the crypto context or null if the header does not contain key response data or is for
* an error message.
* @throws MslKeyExchangeException if there is an error with the key request data or key response
* data or the key exchange scheme is not supported.
* @throws MslCryptoException if the crypto context cannot be created.
* @throws MslEncodingException if there is an error parsing the JSON.
* @throws MslMasterTokenException if the master token is not trusted and needs to be.
* @throws MslEntityAuthException if there is a problem with the master token identity.
*/
private static ICryptoContext getKeyxCryptoContext(
final MslContext ctx, final MessageHeader header, final Set<KeyRequestData> keyRequestData)
throws MslCryptoException, MslKeyExchangeException, MslEncodingException,
MslMasterTokenException, MslEntityAuthException {
// Pull the header data.
final MessageHeader messageHeader = (MessageHeader) header;
final MasterToken masterToken = messageHeader.getMasterToken();
final KeyResponseData keyResponse = messageHeader.getKeyResponseData();
// If there is no key response data then return null.
if (keyResponse == null) return null;
// If the key response data master token is decrypted then use the
// master token keys to create the crypto context.
final MasterToken keyxMasterToken = keyResponse.getMasterToken();
if (keyxMasterToken.isDecrypted()) return new SessionCryptoContext(ctx, keyxMasterToken);
// Perform the key exchange.
final KeyExchangeScheme responseScheme = keyResponse.getKeyExchangeScheme();
final KeyExchangeFactory factory = ctx.getKeyExchangeFactory(responseScheme);
if (factory == null)
throw new MslKeyExchangeException(MslError.KEYX_FACTORY_NOT_FOUND, responseScheme.name());
// Attempt the key exchange but if it fails then try with the next
// key request data before giving up.
MslException keyxException = null;
final Iterator<KeyRequestData> keyRequests = keyRequestData.iterator();
while (keyRequests.hasNext()) {
final KeyRequestData keyRequest = keyRequests.next();
final KeyExchangeScheme requestScheme = keyRequest.getKeyExchangeScheme();
// Skip incompatible key request data.
if (!responseScheme.equals(requestScheme)) continue;
try {
return factory.getCryptoContext(ctx, keyRequest, keyResponse, masterToken);
} catch (final MslKeyExchangeException e) {
if (!keyRequests.hasNext()) throw e;
keyxException = e;
} catch (final MslEncodingException e) {
if (!keyRequests.hasNext()) throw e;
keyxException = e;
} catch (final MslMasterTokenException e) {
if (!keyRequests.hasNext()) throw e;
keyxException = e;
} catch (final MslEntityAuthException e) {
if (!keyRequests.hasNext()) throw e;
keyxException = e;
}
}
// We did not perform a successful key exchange. If we caught an
// exception then throw that exception now.
if (keyxException != null) {
if (keyxException instanceof MslKeyExchangeException)
throw (MslKeyExchangeException) keyxException;
if (keyxException instanceof MslEncodingException) throw (MslEncodingException) keyxException;
if (keyxException instanceof MslMasterTokenException)
throw (MslMasterTokenException) keyxException;
if (keyxException instanceof MslEntityAuthException)
throw (MslEntityAuthException) keyxException;
throw new MslInternalException(
"Unexpected exception caught during key exchange.", keyxException);
}
// If we did not perform a successful key exchange then the
// payloads will not decrypt properly. Throw an exception.
throw new MslKeyExchangeException(
MslError.KEYX_RESPONSE_REQUEST_MISMATCH, Arrays.toString(keyRequestData.toArray()));
}
/**
* Create a new user ID token with the specified user.
*
* @param ctx MSL context.
* @param renewalWindow the renewal window.
* @param expiration the expiration.
* @param masterToken the master token.
* @param serialNumber the user ID token serial number.
* @param issuerData the issuer data. May be null.
* @param user the MSL user.
* @throws MslEncodingException if there is an error encoding the JSON data.
* @throws MslCryptoException if there is an error encrypting or signing the token data.
*/
public UserIdToken(
final MslContext ctx,
final Date renewalWindow,
final Date expiration,
final MasterToken masterToken,
final long serialNumber,
final JSONObject issuerData,
final MslUser user)
throws MslEncodingException, MslCryptoException {
// The expiration must appear after the renewal window.
if (expiration.before(renewalWindow))
throw new MslInternalException(
"Cannot construct a user ID token that expires before its renewal window opens.");
// A master token must be provided.
if (masterToken == null)
throw new MslInternalException("Cannot construct a user ID token without a master token.");
// The serial number must be within range.
if (serialNumber < 0 || serialNumber > MslConstants.MAX_LONG_VALUE)
throw new MslInternalException(
"Serial number " + serialNumber + " is outside the valid range.");
this.ctx = ctx;
this.renewalWindow = renewalWindow.getTime() / MILLISECONDS_PER_SECOND;
this.expiration = expiration.getTime() / MILLISECONDS_PER_SECOND;
this.mtSerialNumber = masterToken.getSerialNumber();
this.serialNumber = serialNumber;
this.issuerData = issuerData;
this.user = user;
// Construct the user data.
final JSONObject userData = new JSONObject();
try {
if (this.issuerData != null) userData.put(KEY_ISSUER_DATA, this.issuerData);
userData.put(KEY_IDENTITY, user.getEncoded());
this.userdata = userData.toString().getBytes(MslConstants.DEFAULT_CHARSET);
} catch (final JSONException e) {
throw new MslEncodingException(MslError.JSON_ENCODE_ERROR, "userdata", e);
}
try {
// Encrypt the user data.
final ICryptoContext cryptoContext = ctx.getMslCryptoContext();
final byte[] ciphertext = cryptoContext.encrypt(this.userdata);
// Construct the token data.
try {
final JSONObject tokenDataJO = new JSONObject();
tokenDataJO.put(KEY_RENEWAL_WINDOW, this.renewalWindow);
tokenDataJO.put(KEY_EXPIRATION, this.expiration);
tokenDataJO.put(KEY_MASTER_TOKEN_SERIAL_NUMBER, this.mtSerialNumber);
tokenDataJO.put(KEY_SERIAL_NUMBER, this.serialNumber);
tokenDataJO.put(KEY_USERDATA, Base64.encode(ciphertext));
this.tokendata = tokenDataJO.toString().getBytes(MslConstants.DEFAULT_CHARSET);
} catch (final JSONException e) {
throw new MslEncodingException(MslError.JSON_ENCODE_ERROR, "usertokendata", e)
.setMasterToken(masterToken);
}
// Sign the token data.
this.signature = cryptoContext.sign(this.tokendata);
this.verified = true;
} catch (final MslCryptoException e) {
e.setMasterToken(masterToken);
throw e;
}
}
/**
* Construct a new message input stream. The header is parsed.
*
* <p>If key request data is provided and a matching key response data is found in the message
* header the key exchange will be performed to process the message payloads.
*
* <p>Service tokens will be decrypted and verified with the provided crypto contexts identified
* by token name. A default crypto context may be provided by using the empty string as the token
* name; if a token name is not explcitly mapped onto a crypto context, the default crypto context
* will be used.
*
* @param ctx MSL context.
* @param source MSL input stream.
* @param charset input stream character set encoding.
* @param keyRequestData key request data to use when processing key response data.
* @param cryptoContexts the map of service token names onto crypto contexts used to decrypt and
* verify service tokens.
* @throws MslEncodingException if there is an error parsing the message.
* @throws MslCryptoException if there is an error decrypting or verifying the header or creating
* the message payload crypto context.
* @throws MslEntityAuthException if unable to create the entity authentication data.
* @throws MslUserAuthException if unable to create the user authentication data.
* @throws MslMessageException if the message master token is expired and the message is not
* renewable.
* @throws MslMasterTokenException if the master token is not trusted and needs to be or if it has
* been revoked.
* @throws MslUserIdTokenException if the user ID token has been revoked.
* @throws MslKeyExchangeException if there is an error with the key request data or key response
* data or the key exchange scheme is not supported.
* @throws MslMessageException if the message master token is expired and the message is not
* renewable.
* @throws MslException if the message does not contain an entity authentication data or a master
* token, or a token is improperly bound to another token.
*/
public MessageInputStream(
final MslContext ctx,
final InputStream source,
final Charset charset,
final Set<KeyRequestData> keyRequestData,
final Map<String, ICryptoContext> cryptoContexts)
throws MslEncodingException, MslEntityAuthException, MslCryptoException, MslUserAuthException,
MslMessageException, MslKeyExchangeException, MslMasterTokenException,
MslUserIdTokenException, MslMessageException, MslException {
// Parse the header.
this.source = source;
this.tokener = new JSONTokener(new InputStreamReader(source, charset));
final JSONObject jo;
try {
if (!this.tokener.more()) throw new MslEncodingException(MslError.MESSAGE_DATA_MISSING);
final Object o = this.tokener.nextValue();
if (!(o instanceof JSONObject)) throw new MslEncodingException(MslError.MESSAGE_FORMAT_ERROR);
jo = (JSONObject) o;
} catch (final JSONException e) {
throw new MslEncodingException(MslError.JSON_PARSE_ERROR, "header", e);
}
this.header = Header.parseHeader(ctx, jo, cryptoContexts);
try {
// For error messages there are no key exchange or payload crypto
// contexts.
if (this.header instanceof ErrorHeader) {
this.keyxCryptoContext = null;
this.cryptoContext = null;
return;
}
// Grab the key exchange crypto context, if any.
final MessageHeader messageHeader = (MessageHeader) this.header;
this.keyxCryptoContext = getKeyxCryptoContext(ctx, messageHeader, keyRequestData);
// In peer-to-peer mode or in trusted network mode with no key
// exchange the payload crypto context equals the header crypto
// context.
if (ctx.isPeerToPeer() || this.keyxCryptoContext == null)
this.cryptoContext = messageHeader.getCryptoContext();
// Otherwise the payload crypto context equals the key exchange
// crypto context.
else this.cryptoContext = this.keyxCryptoContext;
// If this is a handshake message but it is not renewable or does
// not contain key request data then reject the message.
if (messageHeader.isHandshake()
&& (!messageHeader.isRenewable() || messageHeader.getKeyRequestData().isEmpty())) {
throw new MslMessageException(
MslError.HANDSHAKE_DATA_MISSING, messageHeader.toJSONString());
}
// If I am in peer-to-peer mode or the master token is verified
// (i.e. issued by the local entity which is therefore a trusted
// network server) then perform the master token checks.
final MasterToken masterToken = messageHeader.getMasterToken();
if (masterToken != null && (ctx.isPeerToPeer() || masterToken.isVerified())) {
// If the master token has been revoked then reject the
// message.
final TokenFactory factory = ctx.getTokenFactory();
final MslError revoked = factory.isMasterTokenRevoked(ctx, masterToken);
if (revoked != null) throw new MslMasterTokenException(revoked, masterToken);
// If the user ID token has been revoked then reject the
// message. We know the master token is not null and that it is
// verified so we assume the user ID token is as well.
final UserIdToken userIdToken = messageHeader.getUserIdToken();
if (userIdToken != null) {
final MslError uitRevoked = factory.isUserIdTokenRevoked(ctx, masterToken, userIdToken);
if (uitRevoked != null) throw new MslUserIdTokenException(uitRevoked, userIdToken);
}
// If the master token is expired...
if (masterToken.isExpired(null)) {
// If the message is not renewable or does not contain key
// request data then reject the message.
if (!messageHeader.isRenewable() || messageHeader.getKeyRequestData().isEmpty())
throw new MslMessageException(MslError.MESSAGE_EXPIRED, messageHeader.toJSONString());
// If the master token will not be renewed by the token
// factory then reject the message.
//
// This throws an exception if the master token is not
// renewable.
final MslError notRenewable = factory.isMasterTokenRenewable(ctx, masterToken);
if (notRenewable != null)
throw new MslMessageException(
notRenewable, "Master token is expired and not renewable.");
}
}
// TODO: This is the old non-replayable logic for backwards
// compatibility. It should be removed once all MSL stacks have
// migrated to the newer non-replayable ID logic.
//
// If the message is non-replayable (it is not from a trusted
// network server).
if (messageHeader.isNonReplayable()) {
// ...and not also renewable with key request data and a
// master token then reject the message.
if (!messageHeader.isRenewable()
|| messageHeader.getKeyRequestData().isEmpty()
|| masterToken == null) {
throw new MslMessageException(
MslError.INCOMPLETE_NONREPLAYABLE_MESSAGE, messageHeader.toJSONString());
}
// If the message does not have the newest master token
// then notify the sender.
final TokenFactory factory = ctx.getTokenFactory();
if (!factory.isNewestMasterToken(ctx, masterToken))
throw new MslMessageException(MslError.MESSAGE_REPLAYED, messageHeader.toJSONString());
}
// If the message is non-replayable (it is not from a trusted
// network server).
final Long nonReplayableId = messageHeader.getNonReplayableId();
if (nonReplayableId != null) {
// ...and does not include a master token then reject the
// message.
if (masterToken == null)
throw new MslMessageException(
MslError.INCOMPLETE_NONREPLAYABLE_MESSAGE, messageHeader.toJSONString());
// If the non-replayable ID is not accepted then notify the
// sender.
final TokenFactory factory = ctx.getTokenFactory();
final MslError replayed = factory.acceptNonReplayableId(ctx, masterToken, nonReplayableId);
if (replayed != null) throw new MslMessageException(replayed, messageHeader.toJSONString());
}
} catch (final MslException e) {
if (this.header instanceof MessageHeader) {
final MessageHeader messageHeader = (MessageHeader) this.header;
e.setEntity(messageHeader.getMasterToken());
e.setEntity(messageHeader.getEntityAuthenticationData());
e.setUser(messageHeader.getUserIdToken());
e.setUser(messageHeader.getUserAuthenticationData());
e.setMessageId(messageHeader.getMessageId());
} else {
final ErrorHeader errorHeader = (ErrorHeader) this.header;
e.setEntity(errorHeader.getEntityAuthenticationData());
e.setMessageId(errorHeader.getMessageId());
}
throw e;
}
}