GUACAMOLE-926: Add configuration option for enabling self-signed SQL Server certs for local testing.

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-sqlserver/src/main/java/org/apache/guacamole/auth/sqlserver/SQLServerAuthenticationProviderModule.java

@@ -76,6 +76,10 @@ public class SQLServerAuthenticationProviderModule implements Module {
 
         // Use UTF-8 in database
         driverProperties.setProperty("characterEncoding", "UTF-8");
+
+        // Trust unknown server certificates if configured to do so
+        if (environment.trustAllServerCertificates())
+            driverProperties.setProperty("trustServerCertificate", "true");
         
         // Retrieve instance name and set it
         String instance = environment.getSQLServerInstance();

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-sqlserver/src/main/java/org/apache/guacamole/auth/sqlserver/conf/SQLServerEnvironment.java

@@ -295,4 +295,21 @@ public class SQLServerEnvironment extends JDBCEnvironment {
                 true);
     }
 
+    /**
+     * Returns true if all server certificates should be trusted, including
+     * those signed by an unknown certificate authority, such as self-signed
+     * certificates, or false otherwise.
+     *
+     * @throws GuacamoleException
+     *     If an error occurs while retrieving the property value, or if the
+     *     value was not set, as this property is required.
+     */
+    public boolean trustAllServerCertificates() throws GuacamoleException {
+
+        // Do not trust unknown certificates unless explicitly enabled
+        return getProperty(
+                SQLServerGuacamoleProperties.SQLSERVER_TRUST_ALL_SERVER_CERTIFICATES,
+                false);
+    }
+
 }

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-sqlserver/src/main/java/org/apache/guacamole/auth/sqlserver/conf/SQLServerGuacamoleProperties.java

@@ -245,4 +245,17 @@ public class SQLServerGuacamoleProperties {
 
     };
 
+    /**
+     * Whether or not all server certificates should be trusted, including those
+     * signed by an unknown certificate authority, such as self-signed
+     * certificates.
+     */
+    public static final BooleanGuacamoleProperty SQLSERVER_TRUST_ALL_SERVER_CERTIFICATES =
+            new BooleanGuacamoleProperty() {
+
+        @Override
+        public String getName() { return "sqlserver-trust-all-server-certificates"; }
+
+    };
+
 }