Hallo, ich habe mal eine Frage.
und zwar versuche ich gerade mich in Jaas einzuarbeiten aber bekomme immer einen Fehler.
Und zwar:
Cannot create LoginContext. Anmeldekonfiguration kann nicht gefunden werden.
Ich benutze das JAAS Authentication Tutorial von Oracle
Fogende Klassen habe ich:
Die klasse mit der Main, die auch den CallBackHandler Implememntiert:
Dann Natürlich noch die LoginModule-KLasse:
und noch die Principal-Klasse:
Und meine Config-Datei sieht wie folgt aus:
Sample {
sample.module.SampleLoginModule required debug=true;
};
Ich kriege es einfach nicht zum laufen und die Fehlermeldung kann ich auch nicht so ganz deuten. Findet er die Config-Datei nicht oder was findet er nicht?
Vielleicht hat einer von euch eine Ahnung?
Das ich mit nem Mac arbeite dürfte wohl nicht von bedeutung sein, oder?
Gruß
BeginJava
und zwar versuche ich gerade mich in Jaas einzuarbeiten aber bekomme immer einen Fehler.
Und zwar:
Cannot create LoginContext. Anmeldekonfiguration kann nicht gefunden werden.
Ich benutze das JAAS Authentication Tutorial von Oracle
Fogende Klassen habe ich:
Die klasse mit der Main, die auch den CallBackHandler Implememntiert:
Java:
//stimmen folgende 5 Behauptdungen?
//subject = User
//Principal = sowas wie userID
//NameCallback = Name
//PasswordCallback = Passwort
//TextOutputCallback = warning, errors, ... an den user ausgeben.
package sample;
import java.io.*;
import java.util.*;
import javax.security.auth.login.*;
import javax.security.auth.*;
import javax.security.auth.callback.*;
/**
* <p> This Sample application attempts to authenticate a user
* and reports whether or not the authentication was successful.
*/
public class SampleAcn {
/**
* Attempt to authenticate the user.
*
* <p>
*
* @param args input arguments for this application. These are ignored.
*/
public static void main(String[] args) {
// Obtain a LoginContext, needed for authentication. Tell it
// to use the LoginModule implementation specified by the
// entry named "Sample" in the JAAS login configuration
// file and to also use the specified CallbackHandler.
LoginContext lc = null;
try {
lc = new LoginContext("Sample", new MyCallbackHandler());
} catch (LoginException le) {
System.err.println("Cannot create LoginContext. "
+ le.getMessage());
System.exit(-1);
} catch (SecurityException se) {
System.err.println("Cannot create LoginContext. "
+ se.getMessage());
System.exit(-1);
}
// the user has 3 attempts to authenticate successfully
int i;
for (i = 0; i < 3; i++) {
try {
// attempt authentication
lc.login();
// if we return with no exception, authentication succeeded
break;
} catch (LoginException le) {
System.err.println("Authentication failed:");
System.err.println(" " + le.getMessage());
try {
Thread.currentThread().sleep(3000);
} catch (Exception e) {
// ignore
}
}
}
// did they fail three times?
if (i == 3) {
System.out.println("Sorry");
System.exit(-1);
}
System.out.println("Authentication succeeded!");
}
}
/**
* The application implements the CallbackHandler.
*/
class MyCallbackHandler implements CallbackHandler {
/**
* Invoke an array of Callbacks.
*
* <p>
*
* @param callbacks an array of <code>Callback</code> objects which contain
* the information requested by an underlying security
* service to be retrieved or displayed.
*
* @exception java.io.IOException if an input or output error occurs. <p>
*
* @exception UnsupportedCallbackException if the implementation of this
* method does not support one or more of the Callbacks
* specified in the <code>callbacks</code> parameter.
*/
public void handle(Callback[] callbacks)
throws IOException, UnsupportedCallbackException {
for (int i = 0; i < callbacks.length; i++) {
if (callbacks[i] instanceof TextOutputCallback) {
// display the message according to the specified type
TextOutputCallback toc = (TextOutputCallback)callbacks[i];
switch (toc.getMessageType()) {
case TextOutputCallback.INFORMATION:
System.out.println(toc.getMessage());
break;
case TextOutputCallback.ERROR:
System.out.println("ERROR: " + toc.getMessage());
break;
case TextOutputCallback.WARNING:
System.out.println("WARNING: " + toc.getMessage());
break;
default:
throw new IOException("Unsupported message type: " +
toc.getMessageType());
}
} else if (callbacks[i] instanceof NameCallback) {
// prompt the user for a username
NameCallback nc = (NameCallback)callbacks[i];
System.err.print(nc.getPrompt());
System.err.flush();
nc.setName((new BufferedReader
(new InputStreamReader(System.in))).readLine());
} else if (callbacks[i] instanceof PasswordCallback) {
// prompt the user for sensitive information
PasswordCallback pc = (PasswordCallback)callbacks[i];
System.err.print(pc.getPrompt());
System.err.flush();
pc.setPassword(readPassword(System.in));
} else {
throw new UnsupportedCallbackException
(callbacks[i], "Unrecognized Callback");
}
}
}
// Reads user password from given input stream.
private char[] readPassword(InputStream in) throws IOException {
char[] lineBuffer;
char[] buf;
int i;
buf = lineBuffer = new char[128];
int room = buf.length;
int offset = 0;
int c;
loop: while (true) {
switch (c = in.read()) {
case -1:
case '\n':
break loop;
case '\r':
int c2 = in.read();
if ((c2 != '\n') && (c2 != -1)) {
if (!(in instanceof PushbackInputStream)) {
in = new PushbackInputStream(in);
}
((PushbackInputStream)in).unread(c2);
} else
break loop;
default:
if (--room < 0) {
buf = new char[offset + 128];
room = buf.length - offset - 1;
System.arraycopy(lineBuffer, 0, buf, 0, offset);
Arrays.fill(lineBuffer, ' ');
lineBuffer = buf;
}
buf[offset++] = (char) c;
break;
}
}
if (offset == 0) {
return null;
}
char[] ret = new char[offset];
System.arraycopy(buf, 0, ret, 0, offset);
Arrays.fill(buf, ' ');
return ret;
}
}Dann Natürlich noch die LoginModule-KLasse:
Java:
package sample.module;
import java.util.*;
import java.io.IOException;
import javax.security.auth.*;
import javax.security.auth.callback.*;
import javax.security.auth.login.*;
import javax.security.auth.spi.*;
import sample.principal.SamplePrincipal;
public class SampleLoginModule implements LoginModule {
// initial state
private Subject subject;
private CallbackHandler callbackHandler;
private Map sharedState;
private Map options;
// configurable option
private boolean debug = false;
// the authentication status
private boolean succeeded = false;
private boolean commitSucceeded = false;
// username and password
private String username;
private char[] password;
// testUser's SamplePrincipal
private SamplePrincipal userPrincipal;
public void initialize(Subject subject, CallbackHandler callbackHandler,
Map sharedState, Map options) {
this.subject = subject;
this.callbackHandler = callbackHandler;
this.sharedState = sharedState;
this.options = options;
// initialize any configured options
debug = "true".equalsIgnoreCase((String)options.get("debug"));
}
public boolean login() throws LoginException {
// prompt for a user name and password
if (callbackHandler == null)
throw new LoginException("Error: no CallbackHandler available " +
"to garner authentication information from the user");
Callback[] callbacks = new Callback[2];
callbacks[0] = new NameCallback("user name: ");
callbacks[1] = new PasswordCallback("password: ", false);
try {
callbackHandler.handle(callbacks);
username = ((NameCallback)callbacks[0]).getName();
char[] tmpPassword = ((PasswordCallback)callbacks[1]).getPassword();
if (tmpPassword == null) {
// treat a NULL password as an empty password
tmpPassword = new char[0];
}
password = new char[tmpPassword.length];
System.arraycopy(tmpPassword, 0,
password, 0, tmpPassword.length);
((PasswordCallback)callbacks[1]).clearPassword();
} catch (java.io.IOException ioe) {
throw new LoginException(ioe.toString());
} catch (UnsupportedCallbackException uce) {
throw new LoginException("Error: " + uce.getCallback().toString() +
" not available to garner authentication information " +
"from the user");
}
// print debugging information
if (debug) {
System.out.println("\t\t[SampleLoginModule] " +
"user entered user name: " +
username);
System.out.print("\t\t[SampleLoginModule] " +
"user entered password: ");
for (int i = 0; i < password.length; i++)
System.out.print(password[i]);
System.out.println();
}
// verify the username/password
boolean usernameCorrect = false;
boolean passwordCorrect = false;
if (username.equals("testUser"))
usernameCorrect = true;
if (usernameCorrect &&
password.length == 12 &&
password[0] == 't' &&
password[1] == 'e' &&
password[2] == 's' &&
password[3] == 't' &&
password[4] == 'P' &&
password[5] == 'a' &&
password[6] == 's' &&
password[7] == 's' &&
password[8] == 'w' &&
password[9] == 'o' &&
password[10] == 'r' &&
password[11] == 'd') {
// authentication succeeded!!!
passwordCorrect = true;
if (debug)
System.out.println("\t\t[SampleLoginModule] " +
"authentication succeeded");
succeeded = true;
return true;
} else {
// authentication failed -- clean out state
if (debug)
System.out.println("\t\t[SampleLoginModule] " +
"authentication failed");
succeeded = false;
username = null;
for (int i = 0; i < password.length; i++)
password[i] = ' ';
password = null;
if (!usernameCorrect) {
throw new FailedLoginException("User Name Incorrect");
} else {
throw new FailedLoginException("Password Incorrect");
}
}
}
public boolean commit() throws LoginException {
if (succeeded == false) {
return false;
} else {
// add a Principal (authenticated identity)
// to the Subject
// assume the user we authenticated is the SamplePrincipal
userPrincipal = new SamplePrincipal(username);
if (!subject.getPrincipals().contains(userPrincipal))
subject.getPrincipals().add(userPrincipal);
if (debug) {
System.out.println("\t\t[SampleLoginModule] " +
"added SamplePrincipal to Subject");
}
// in any case, clean out state
username = null;
for (int i = 0; i < password.length; i++)
password[i] = ' ';
password = null;
commitSucceeded = true;
return true;
}
}
public boolean abort() throws LoginException {
if (succeeded == false) {
return false;
} else if (succeeded == true && commitSucceeded == false) {
// login succeeded but overall authentication failed
succeeded = false;
username = null;
if (password != null) {
for (int i = 0; i < password.length; i++)
password[i] = ' ';
password = null;
}
userPrincipal = null;
} else {
// overall authentication succeeded and commit succeeded,
// but someone else's commit failed
logout();
}
return true;
}
public boolean logout() throws LoginException {
subject.getPrincipals().remove(userPrincipal);
succeeded = false;
succeeded = commitSucceeded;
username = null;
if (password != null) {
for (int i = 0; i < password.length; i++)
password[i] = ' ';
password = null;
}
userPrincipal = null;
return true;
}
}
Java:
package sample.principal;
import java.security.Principal;
public class SamplePrincipal implements Principal, java.io.Serializable {
private String name;
public SamplePrincipal(String name) {
if (name == null)
throw new NullPointerException("illegal null input");
this.name = name;
}
public String getName() {
return name;
}
public String toString() {
return("SamplePrincipal: " + name);
}
public boolean equals(Object o) {
if (o == null)
return false;
if (this == o)
return true;
if (!(o instanceof SamplePrincipal))
return false;
SamplePrincipal that = (SamplePrincipal)o;
if (this.getName().equals(that.getName()))
return true;
return false;
}
public int hashCode() {
return name.hashCode();
}
}Und meine Config-Datei sieht wie folgt aus:
Sample {
sample.module.SampleLoginModule required debug=true;
};
Ich kriege es einfach nicht zum laufen und die Fehlermeldung kann ich auch nicht so ganz deuten. Findet er die Config-Datei nicht oder was findet er nicht?
Vielleicht hat einer von euch eine Ahnung?
Das ich mit nem Mac arbeite dürfte wohl nicht von bedeutung sein, oder?
Gruß
BeginJava
Zuletzt bearbeitet:
