--- /dev/null
+package org.argeo.util.crypto;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.CharArrayWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.Reader;
+import java.io.Writer;
+import java.security.AccessController;
+import java.util.Arrays;
+import java.util.Iterator;
+
+import javax.crypto.SecretKey;
+import javax.security.auth.Subject;
+import javax.security.auth.callback.Callback;
+import javax.security.auth.callback.CallbackHandler;
+import javax.security.auth.callback.PasswordCallback;
+import javax.security.auth.callback.TextOutputCallback;
+import javax.security.auth.callback.UnsupportedCallbackException;
+import javax.security.auth.login.LoginContext;
+import javax.security.auth.login.LoginException;
+
+import org.argeo.ArgeoException;
+import org.argeo.StreamUtils;
+
+/** username / password based keyring. TODO internationalize */
+public abstract class AbstractKeyring implements Keyring {
+ public final static String DEFAULT_KEYRING_LOGIN_CONTEXT = "KEYRING";
+
+ private String loginContextName = DEFAULT_KEYRING_LOGIN_CONTEXT;
+ private CallbackHandler defaultCallbackHandler;
+
+ private String charset = "UTF-8";
+
+ /**
+ * Whether the keyring has already been created in the past with a master
+ * password
+ */
+ protected abstract Boolean isSetup();
+
+ /**
+ * Setup the keyring persistently, {@link #isSetup()} must return true
+ * afterwards
+ */
+ protected abstract void setup();
+
+ /** Populates the key spec callback */
+ protected abstract void handleKeySpecCallback(PBEKeySpecCallback pbeCallback);
+
+ protected abstract void encrypt(String path, InputStream unencrypted);
+
+ protected abstract InputStream decrypt(String path);
+
+ /** Triggers lazy initialization */
+ protected SecretKey getSecretKey() {
+ Subject subject = Subject.getSubject(AccessController.getContext());
+ // we assume only one secrete key is available
+ Iterator<SecretKey> iterator = subject.getPrivateCredentials(
+ SecretKey.class).iterator();
+ if (!iterator.hasNext()) {// not initialized
+ CallbackHandler callbackHandler = new KeyringCallbackHandler();
+ try {
+ LoginContext loginContext = new LoginContext(loginContextName,
+ subject, callbackHandler);
+ loginContext.login();
+ // FIXME will login even if password is wrong
+ iterator = subject.getPrivateCredentials(SecretKey.class)
+ .iterator();
+ return iterator.next();
+ } catch (LoginException e) {
+ throw new ArgeoException("Keyring login failed", e);
+ }
+
+ } else {
+ SecretKey secretKey = iterator.next();
+ if (iterator.hasNext())
+ throw new ArgeoException(
+ "More than one secret key in private credentials");
+ return secretKey;
+ }
+ }
+
+ public InputStream getAsStream(String path) {
+ return decrypt(path);
+ }
+
+ public void set(String path, InputStream in) {
+ encrypt(path, in);
+ }
+
+ public char[] getAsChars(String path) {
+ InputStream in = getAsStream(path);
+ CharArrayWriter writer = null;
+ Reader reader = null;
+ try {
+ writer = new CharArrayWriter();
+ reader = new InputStreamReader(in, charset);
+ StreamUtils.copy(reader, writer);
+ return writer.toCharArray();
+ } catch (IOException e) {
+ throw new ArgeoException("Cannot decrypt to char array", e);
+ } finally {
+ StreamUtils.closeQuietly(reader);
+ StreamUtils.closeQuietly(in);
+ StreamUtils.closeQuietly(writer);
+ }
+ }
+
+ public void set(String path, char[] arr) {
+ ByteArrayOutputStream out = new ByteArrayOutputStream();
+ ByteArrayInputStream in = null;
+ Writer writer = null;
+ try {
+ writer = new OutputStreamWriter(out, charset);
+ writer.write(arr);
+ in = new ByteArrayInputStream(out.toByteArray());
+ set(path, in);
+ } catch (IOException e) {
+ throw new ArgeoException("Cannot encrypt to char array", e);
+ } finally {
+ StreamUtils.closeQuietly(writer);
+ StreamUtils.closeQuietly(out);
+ StreamUtils.closeQuietly(in);
+ }
+ }
+
+ public void setLoginContextName(String loginContextName) {
+ this.loginContextName = loginContextName;
+ }
+
+ public void setDefaultCallbackHandler(CallbackHandler defaultCallbackHandler) {
+ this.defaultCallbackHandler = defaultCallbackHandler;
+ }
+
+ public void setCharset(String charset) {
+ this.charset = charset;
+ }
+
+ class KeyringCallbackHandler implements CallbackHandler {
+ public void handle(Callback[] callbacks) throws IOException,
+ UnsupportedCallbackException {
+ // checks
+ if (callbacks.length != 2)
+ throw new IllegalArgumentException(
+ "Keyring required 2 and only 2 callbacks: {PasswordCallback,PBEKeySpecCallback}");
+ if (!(callbacks[0] instanceof PasswordCallback))
+ throw new UnsupportedCallbackException(callbacks[0]);
+ if (!(callbacks[1] instanceof PBEKeySpecCallback))
+ throw new UnsupportedCallbackException(callbacks[0]);
+
+ PasswordCallback passwordCb = (PasswordCallback) callbacks[0];
+ PBEKeySpecCallback pbeCb = (PBEKeySpecCallback) callbacks[1];
+
+ if (isSetup()) {
+ Callback[] dialogCbs = new Callback[] { passwordCb };
+ defaultCallbackHandler.handle(dialogCbs);
+ } else {// setup keyring
+ TextOutputCallback textCb1 = new TextOutputCallback(
+ TextOutputCallback.INFORMATION,
+ "Enter a master password");
+ TextOutputCallback textCb2 = new TextOutputCallback(
+ TextOutputCallback.INFORMATION,
+ "It will encrypt your private data");
+ TextOutputCallback textCb3 = new TextOutputCallback(
+ TextOutputCallback.INFORMATION,
+ "Don't forget it or your data is lost");
+ PasswordCallback confirmPasswordCb = new PasswordCallback(
+ "Confirm password", false);
+ // first try
+ Callback[] dialogCbs = new Callback[] { textCb1, textCb2,
+ textCb3, passwordCb, confirmPasswordCb };
+ defaultCallbackHandler.handle(dialogCbs);
+
+ // if passwords different, retry (except if cancelled)
+ while (passwordCb.getPassword() != null
+ && !Arrays.equals(passwordCb.getPassword(),
+ confirmPasswordCb.getPassword())) {
+ TextOutputCallback textCb = new TextOutputCallback(
+ TextOutputCallback.ERROR,
+ "The passwords do not match");
+ dialogCbs = new Callback[] { textCb, passwordCb,
+ confirmPasswordCb };
+ defaultCallbackHandler.handle(dialogCbs);
+ }
+
+ if (passwordCb.getPassword() != null)// not cancelled
+ setup();
+ }
+
+ if (passwordCb.getPassword() != null)
+ handleKeySpecCallback(pbeCb);
+ }
+
+ }
+}
projects / lgpl / argeo-commons.git / blobdiff