Github user mike-jumper commented on a diff in the pull request:
https://github.com/apache/incubator-guacamole-client/pull/183#discussion_r134756239
--- Diff:
extensions/guacamole-auth-cas/src/main/java/org/apache/guacamole/auth/cas/AuthenticationProviderService.java
---
@@ -105,4 +137,76 @@ public AuthenticatedUser authenticateUser(Credentials
credentials)
}
+ /**
+ * Takes an encrypted string representing a password provided by
+ * the CAS ClearPass service and decrypts it using the private
+ * key configured for this extension. Returns null if it is
+ * unable to decrypt the password.
+ *
+ * @param encryptedPassword
+ * A string with the encrypted password provided by the
+ * CAS service.
+ *
+ * @return
+ * The decrypted password, or null if it is unable to
+ * decrypt the password.
+ * @throws GuacamoleException
+ * If unable to get Guacamole configuration data
+ */
+ private final String decryptPassword(String encryptedPassword)
+ throws GuacamoleException {
+
+ // If we get nothing, we return nothing.
+ if (encryptedPassword == null || encryptedPassword.isEmpty())
+ return null;
+
+ try {
+
+ // Open and read the file specified in the configuration.
+ File keyFile = new File(new
LocalEnvironment().getGuacamoleHome(),
confService.getClearpassKey().toString());
+ InputStream keyInput = new BufferedInputStream(new
FileInputStream(keyFile));
+ final byte[] keyBytes = new byte[(int) keyFile.length()];
+ keyInput.read(keyBytes);
+ keyInput.close();
+
+ // Set up decryption infrastructure
+ KeyFactory keyFactory = KeyFactory.getInstance("RSA");
+ KeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
+ final PrivateKey privateKey =
keyFactory.generatePrivate(keySpec);
+ final Cipher cipher =
Cipher.getInstance(privateKey.getAlgorithm());
+ final byte[] pass64 =
DatatypeConverter.parseBase64Binary(encryptedPassword);
--- End diff --
Beware that this will throw an `IllegalArgumentException` provided data is
not valid base64. That case will need to be handled for this function to behave
in a robust manner.
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