/** Default constructor. */
public DigestServerAuthenticationMethod() {
try {
messageDigest = MessageDigest.getInstance(DEFAULT_ALGORITHM);
} catch (NoSuchAlgorithmException ex) {
ProxyDebug.println("Algorithm not found " + ex);
ex.printStackTrace();
}
passwordTable = new Hashtable();
}
/**
* Initialize -- load password files etc. Password file format is name:authentication
* domain:password
*
* @param pwFileName is the password file name.
* @param Exception is thrown when the password file is bad.
*/
public void initialize(String pwFileName) {
try {
XMLAuthenticationParser parser = new XMLAuthenticationParser(pwFileName);
String def = parser.getRealm();
if (def != null) DEFAULT_REALM = def;
ProxyDebug.println(
"DEBUG, DigestAuthenticationMethod, initialize()," + " the realm is:" + DEFAULT_REALM);
Vector usersTagList = parser.getUsersTagList();
if (usersTagList != null)
for (int i = 0; i < usersTagList.size(); i++) {
UserTag userTag = (UserTag) usersTagList.elementAt(i);
String userName = userTag.getUserName();
// String userRealm=userTag.getUserRealm();
String userPassword = userTag.getUserPassword();
if (userName != null) {
if (userPassword == null) {
ProxyDebug.println(
"DEBUG, DigestAuthenticationMethod, initialize(),"
+ " the userPassword parameter does not exist for user: "******", we use the default: \""
+ NULL_PASSWORD
+ "\"");
userPassword = NULL_PASSWORD;
}
passwordTable.put(userName + "@" + DEFAULT_REALM, userPassword);
} else {
ProxyDebug.println(
"DEBUG, DigestAuthenticationMethod, initialize(),"
+ " the userName parameter does not exist, we skip this entry!!");
}
}
else
ProxyDebug.println(
"DEBUG, DigestAuthenticationMethod, initialize(),"
+ "Error during parsing the passwords file!");
} catch (Exception e) {
ProxyDebug.println("ERROR, DigestAuthenticationMethod, initialize()," + "exception raised:");
e.printStackTrace();
}
}
/**
* Check the response and answer true if authentication succeeds. We are making simplifying
* assumptions here and assuming that the password is available to us for computation of the MD5
* hash. We also dont cache authentications so that the user has to authenticate on each
* registration.
*
* @param user is the username
* @param authHeader is the Authroization header from the SIP request.
* @param requestLine is the SIP Request line from the SIP request.
* @exception SIPAuthenticationException is thrown when authentication fails or message is bad
*/
public boolean doAuthenticate(String user, AuthorizationHeader authHeader, Request request) {
String realm = authHeader.getRealm();
String username = authHeader.getUsername();
URI requestURI = request.getRequestURI();
if (username == null) {
ProxyDebug.println(
"DEBUG, DigestAuthenticateMethod, doAuthenticate(): "
+ "WARNING: userName parameter not set in the header received!!!");
username = user;
}
if (realm == null) {
ProxyDebug.println(
"DEBUG, DigestAuthenticateMethod, doAuthenticate(): "
+ "WARNING: realm parameter not set in the header received!!! WE use the default one");
realm = DEFAULT_REALM;
}
ProxyDebug.println(
"DEBUG, DigestAuthenticateMethod, doAuthenticate(): "
+ "Trying to authenticate user: "******" for "
+ " the realm: "
+ realm);
String password = (String) passwordTable.get(username + "@" + realm);
if (password == null) {
ProxyDebug.println(
"DEBUG, DigestAuthenticateMethod, doAuthenticate(): "
+ "ERROR: password not found for the user: "******"@"
+ realm);
return false;
}
String nonce = authHeader.getNonce();
// If there is a URI parameter in the Authorization header,
// then use it.
URI uri = authHeader.getURI();
// There must be a URI parameter in the authorization header.
if (uri == null) {
ProxyDebug.println(
"DEBUG, DigestAuthenticateMethod, doAuthenticate(): "
+ "ERROR: uri paramater not set in the header received!");
return false;
}
ProxyDebug.println(
"DEBUG, DigestAuthenticationMethod, doAuthenticate(), username:"******"!");
ProxyDebug.println("DEBUG, DigestAuthenticationMethod, doAuthenticate(), realm:" + realm + "!");
ProxyDebug.println(
"DEBUG, DigestAuthenticationMethod, doAuthenticate(), password:"******"!");
ProxyDebug.println("DEBUG, DigestAuthenticationMethod, doAuthenticate(), uri:" + uri + "!");
ProxyDebug.println("DEBUG, DigestAuthenticationMethod, doAuthenticate(), nonce:" + nonce + "!");
ProxyDebug.println(
"DEBUG, DigestAuthenticationMethod, doAuthenticate(), method:" + request.getMethod() + "!");
String A1 = username + ":" + realm + ":" + password;
String A2 = request.getMethod().toUpperCase() + ":" + uri.toString();
byte mdbytes[] = messageDigest.digest(A1.getBytes());
String HA1 = ProxyUtilities.toHexString(mdbytes);
ProxyDebug.println("DEBUG, DigestAuthenticationMethod, doAuthenticate(), HA1:" + HA1 + "!");
mdbytes = messageDigest.digest(A2.getBytes());
String HA2 = ProxyUtilities.toHexString(mdbytes);
ProxyDebug.println("DEBUG, DigestAuthenticationMethod, doAuthenticate(), HA2:" + HA2 + "!");
String cnonce = authHeader.getCNonce();
String KD = HA1 + ":" + nonce;
if (cnonce != null) {
KD += ":" + cnonce;
}
KD += ":" + HA2;
mdbytes = messageDigest.digest(KD.getBytes());
String mdString = ProxyUtilities.toHexString(mdbytes);
String response = authHeader.getResponse();
ProxyDebug.println(
"DEBUG, DigestAuthenticateMethod, doAuthenticate(): "
+ "we have to compare his response: "
+ response
+ " with our computed"
+ " response: "
+ mdString);
int res = (mdString.compareTo(response));
if (res == 0) {
ProxyDebug.println(
"DEBUG, DigestAuthenticateMethod, doAuthenticate(): " + "User authenticated...");
} else {
ProxyDebug.println(
"DEBUG, DigestAuthenticateMethod, doAuthenticate(): " + "User not authenticated...");
}
return res == 0;
}