use of sun.security.jgss.krb5.ServiceCreds in project jdk8u_jdk by JetBrains.
the class KerberosClientKeyExchangeImpl method init.
/**
* Creates an instance of KerberosClientKeyExchange from its ASN.1 encoding.
* Used by ServerHandshaker to verify and obtain premaster secret.
*
* @param protocolVersion current protocol version
* @param clientVersion version requested by client in its ClientHello;
* used by premaster secret version check
* @param rand random number generator used for generating random
* premaster secret if ticket and/or premaster verification fails
* @param input inputstream from which to get ASN.1-encoded KerberosWrapper
* @param acc the AccessControlContext of the handshaker
* @param serviceCreds server's creds
*/
@Override
public void init(ProtocolVersion protocolVersion, ProtocolVersion clientVersion, SecureRandom rand, HandshakeInStream input, AccessControlContext acc, Object serviceCreds) throws IOException {
// Read ticket
encodedTicket = input.getBytes16();
if (debug != null && Debug.isOn("verbose")) {
Debug.println(System.out, "encoded Kerberos service ticket", encodedTicket);
}
EncryptionKey sessionKey = null;
try {
Ticket t = new Ticket(encodedTicket);
EncryptedData encPart = t.encPart;
PrincipalName ticketSname = t.sname;
final ServiceCreds creds = (ServiceCreds) serviceCreds;
final KerberosPrincipal princ = new KerberosPrincipal(ticketSname.toString());
// For bound service, permission already checked at setup
if (creds.getName() == null) {
SecurityManager sm = System.getSecurityManager();
try {
if (sm != null) {
// Eliminate dependency on ServicePermission
sm.checkPermission(Krb5Helper.getServicePermission(ticketSname.toString(), "accept"), acc);
}
} catch (SecurityException se) {
serviceCreds = null;
// Do not destroy keys. Will affect Subject
if (debug != null && Debug.isOn("handshake")) {
System.out.println("Permission to access Kerberos" + " secret key denied");
}
throw new IOException("Kerberos service not allowedy");
}
}
KerberosKey[] serverKeys = AccessController.doPrivileged(new PrivilegedAction<KerberosKey[]>() {
@Override
public KerberosKey[] run() {
return creds.getKKeys(princ);
}
});
if (serverKeys.length == 0) {
throw new IOException("Found no key for " + princ + (creds.getName() == null ? "" : (", this keytab is for " + creds.getName() + " only")));
}
/*
* permission to access and use the secret key of the Kerberized
* "host" service is done in ServerHandshaker.getKerberosKeys()
* to ensure server has the permission to use the secret key
* before promising the client
*/
// See if we have the right key to decrypt the ticket to get
// the session key.
int encPartKeyType = encPart.getEType();
Integer encPartKeyVersion = encPart.getKeyVersionNumber();
KerberosKey dkey = null;
try {
dkey = findKey(encPartKeyType, encPartKeyVersion, serverKeys);
} catch (KrbException ke) {
// a kvno mismatch
throw new IOException("Cannot find key matching version number", ke);
}
if (dkey == null) {
// %%% Should print string repr of etype
throw new IOException("Cannot find key of appropriate type" + " to decrypt ticket - need etype " + encPartKeyType);
}
EncryptionKey secretKey = new EncryptionKey(encPartKeyType, dkey.getEncoded());
// Decrypt encPart using server's secret key
byte[] bytes = encPart.decrypt(secretKey, KeyUsage.KU_TICKET);
// Reset data stream after decryption, remove redundant bytes
byte[] temp = encPart.reset(bytes);
EncTicketPart encTicketPart = new EncTicketPart(temp);
// Record the Kerberos Principals
peerPrincipal = new KerberosPrincipal(encTicketPart.cname.getName());
localPrincipal = new KerberosPrincipal(ticketSname.getName());
sessionKey = encTicketPart.key;
if (debug != null && Debug.isOn("handshake")) {
System.out.println("server principal: " + ticketSname);
System.out.println("cname: " + encTicketPart.cname.toString());
}
} catch (IOException e) {
throw e;
} catch (Exception e) {
if (debug != null && Debug.isOn("handshake")) {
System.out.println("KerberosWrapper error getting session key," + " generating random secret (" + e.getMessage() + ")");
}
sessionKey = null;
}
// XXX Read and ignore authenticator
input.getBytes16();
if (sessionKey != null) {
preMaster = new KerberosPreMasterSecret(protocolVersion, clientVersion, rand, input, sessionKey);
} else {
// Generate bogus premaster secret
preMaster = new KerberosPreMasterSecret(clientVersion, rand);
}
}
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