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Wire RdpCommandProcessor with Guacamole WebSocket handler for real-time RDP input analysis and rule enforcement (#19)
* Initial plan * Wire RdpCommandProcessor with Guacamole WebSocket handler - Add RdpCommandProcessor injection into GuacamoleTunnelWebSocketHandler - Parse Guacamole protocol messages to extract instruction type (key, mouse, clipboard, file) - Convert Guacamole instructions to RdpInputEvent for analysis - Process input events through RdpCommandProcessor for real-time policy enforcement - Block or allow messages based on RdpCommandProcessor analysis - Create ConnectedSystem from JWT for session tracking - Add comprehensive tests for WebSocket handler integration Co-authored-by: phrocker <[email protected]> * Add documentation for RdpCommandProcessor integration - Document real-time input analysis in GUACAMOLE_INTEGRATION.md - Add Guacamole protocol parsing table - Explain policy enforcement actions - List monitored input event types Co-authored-by: phrocker <[email protected]> * Add comprehensive integration summary document - Create RDP_COMMAND_PROCESSOR_INTEGRATION.md with complete overview - Document all changes, technical details, and testing results - Explain security benefits and deployment considerations - List future enhancement opportunities Co-authored-by: phrocker <[email protected]> * Integrate DeletePrevention and other rules with keyboard input analysis - Add text buffer accumulation per session to track typed commands - Register AccessTokenEvaluator rules (DeletePrevention, SudoPrevention, etc.) for sessions - Apply rules to accumulated keyboard input before forwarding to RDP server - Parse keysym data to extract typed characters from Guacamole protocol - Clear buffer on Enter key to start fresh command - Initialize session rules from User's HostGroup in WebSocket handler - Clean up session data on disconnect Co-authored-by: phrocker <[email protected]> * add charts as exclusion * Fix LazyInitializationException when loading HostGroup rules - Add @transactional annotation to initializeSessionRules method - Change method visibility from private to public for Spring AOP proxy - Use readOnly=true for performance optimization - Ensures database session remains active when accessing lazy-loaded rules collection Co-authored-by: phrocker <[email protected]> * add charts as exclusion * Use AccessTokenAuditor for keyboard input processing - Replace manual text accumulation with AccessTokenAuditor infrastructure - Leverage built-in handling for ctrl+c, backspace, enter, tab completion - Use CommandBuilder for proper command sanitization - Map Guacamole keysyms to keycodes that AccessTokenAuditor expects - Update registerSessionRules to create AccessTokenAuditor instance - Pass both synchronous rules and startup actions to auditor - Update tests to reflect new constructor dependencies Co-authored-by: phrocker <[email protected]> * add charts as exclusion --------- Co-authored-by: copilot-swe-agent[bot] <[email protected]> Co-authored-by: phrocker <[email protected]> Co-authored-by: Marc Parisi <[email protected]>
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‎.local.env‎

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SENTRIUS_VERSION=1.1.501
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SENTRIUS_VERSION=1.1.502
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SENTRIUS_SSH_VERSION=1.1.45
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SENTRIUS_KEYCLOAK_VERSION=1.1.60
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SENTRIUS_AGENT_VERSION=1.1.46
@@ -7,4 +7,4 @@ LLMPROXY_VERSION=1.0.87
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LAUNCHER_VERSION=1.0.91
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AGENTPROXY_VERSION=1.0.92
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SSHPROXY_VERSION=1.0.91
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RDPPROXY_VERSION=1.0.82
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RDPPROXY_VERSION=1.0.99

‎.local.env.bak‎

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SENTRIUS_VERSION=1.1.501
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SENTRIUS_VERSION=1.1.502
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SENTRIUS_SSH_VERSION=1.1.45
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SENTRIUS_KEYCLOAK_VERSION=1.1.60
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SENTRIUS_AGENT_VERSION=1.1.46
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LAUNCHER_VERSION=1.0.91
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AGENTPROXY_VERSION=1.0.92
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SSHPROXY_VERSION=1.0.91
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RDPPROXY_VERSION=1.0.82
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RDPPROXY_VERSION=1.0.99

‎api/src/main/java/io/sentrius/sso/controllers/api/HostApiController.java‎

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@@ -349,6 +349,7 @@ public ResponseEntity<Map<String, Object>> initiateRdpSession(
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sessionData.put("host", hostSystem.getHost());
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sessionData.put("port", hostSystem.getRdpPort() != null ? hostSystem.getRdpPort() : 3389);
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sessionData.put("username", user.getUsername());
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sessionData.put("userId", user.getId());
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sessionData.put("jwtToken", jwtToken);
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sessionData.put("target", hostSystem.getId());
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sessionData.put("websocketHost", systemOptions.getRdpProxyDomain());

‎dataplane/src/main/java/io/sentrius/sso/core/services/HostGroupService.java‎

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@Autowired
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private TerminalSessionMetadataRepository terminalSessionMetadataRepository;
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@Transactional
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@Transactional(readOnly = true)
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public HostGroup getHostGroup(Long hostGroupId) {
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HostGroup hostGroup = hostGroupRepository.findById(hostGroupId)
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.orElseThrow(() -> new EntityNotFoundException("Host " + hostGroupId + " Group not found"));
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Hibernate.initialize(hostGroup.getRules());
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return hostGroup;
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}
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@Transactional(readOnly = true)
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public List<HostGroup> getHostGroupsForUser(Long userId) {
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return userRepository.findHostGroupsByUserId(userId).stream().toList();
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var hostGroupList = userRepository.findHostGroupsByUserId(userId).stream().toList();
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hostGroupList.forEach(hostGroup -> {
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Hibernate.initialize(hostGroup.getHostSystems());
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Hibernate.initialize(hostGroup.getRules());
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hostGroup.getHostSystems().forEach(hostSystem -> {
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Hibernate.initialize(hostSystem.getPublicKeyList());
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});
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});
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return hostGroupList;
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}
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public List<HostGroup> getHostGroupsByName(String name) {

‎rdp-proxy/GUACAMOLE_INTEGRATION.md‎

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@@ -85,15 +85,39 @@ public class GuacamoleRdpService {
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```java
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@Component
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public class GuacamoleTunnelWebSocketHandler extends TextWebSocketHandler {
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private final RdpCommandProcessor rdpCommandProcessor;
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@Override
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public void afterConnectionEstablished(WebSocketSession session) {
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// Extract JWT from query parameters
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// Create Guacamole tunnel
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// Track session
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// Track session with ConnectedSystem for RdpCommandProcessor
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}
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@Override
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protected void handleTextMessage(WebSocketSession session, TextMessage message) {
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// Parse Guacamole protocol instruction (format: <length>.<opcode>,<args>)
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// Analyze input events through RdpCommandProcessor
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// Block or allow based on security policy
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// Forward approved messages to Guacamole tunnel
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}
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}
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```
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#### Guacamole Protocol Parsing
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The handler parses Guacamole protocol instructions to extract input events:
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| Instruction | Format | Example | RdpInputEvent Type |
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|-------------|--------|---------|-------------------|
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| `key` | `3.key,<length>.<keysym>,1.<pressed>;` | `3.key,5.65307,1.1;` | KEYBOARD |
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| `mouse` (click) | `5.mouse,<len>.<x>,<len>.<y>,<len>.<mask>;` | `5.mouse,3.100,3.200,1.1;` | MOUSE_CLICK |
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| `mouse` (move) | `5.mouse,<len>.<x>,<len>.<y>,1.0;` | `5.mouse,3.150,3.250,1.0;` | MOUSE_MOVE |
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| `clipboard` | `9.clipboard,<len>.<type>,<len>.<data>;` | `9.clipboard,10.text/plain,5.Hello;` | KEYBOARD (clipboard) |
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| `file` | `4.file,<len>.<stream>,<len>.<name>;` | `4.file,1.0,8.test.pdf;` | KEYBOARD (file) |
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Non-input instructions (like `size`, `sync`, `ack`) are forwarded directly without analysis.
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### Frontend Integration
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```javascript
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// WebSocket connection with JWT
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5. **Agent monitoring activated** for session
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6. **Rule evaluation applied** to all activities
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### Real-Time Input Analysis with RdpCommandProcessor
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The WebSocket handler now integrates with `RdpCommandProcessor` to provide real-time analysis and policy enforcement for all user input:
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```java
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@Component
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public class GuacamoleTunnelWebSocketHandler extends TextWebSocketHandler {
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private final RdpCommandProcessor rdpCommandProcessor;
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@Override
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protected void handleTextMessage(WebSocketSession session, TextMessage message) {
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// Parse Guacamole protocol instruction
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GuacamoleInstruction instruction = parseGuacamoleInstruction(payload);
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// Analyze input events (keyboard, mouse, clipboard, file transfers)
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if (shouldAnalyzeInstruction(instruction)) {
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RdpInputEvent inputEvent = convertToRdpInputEvent(instruction);
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boolean allowed = rdpCommandProcessor.processInputEvent(
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connectedSystem, inputEvent, outputStream);
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if (!allowed) {
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// Block the input and send error to client
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return;
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}
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}
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// Forward to Guacamole tunnel
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writer.write(payload.toCharArray());
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}
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}
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```
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#### Monitored Input Events
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- **Keyboard Events** - All keystrokes analyzed for dangerous commands, password patterns
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- **Mouse Clicks** - Click patterns and rapid clicking detection
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- **Mouse Movement** - Unnatural movement patterns indicating automation
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- **Clipboard Access** - Sensitive data detection in clipboard operations
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- **File Transfers** - File operations monitored and controlled
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#### Policy Enforcement Actions
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- **DENY_ACTION** - Blocks the input event from reaching the RDP server
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- **WARN_ACTION** - Allows input but displays warning to user
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- **RECORD_ACTION** - Logs input for audit/compliance
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- **ALERT_ACTION** - Sends real-time alert to security team
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### Agent Monitoring
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```java
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// Sentrius agent integration

‎rdp-proxy/RDP_COMMAND_PROCESSOR_INTEGRATION.md‎

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# RDP Guacamole WebSocket Integration with RdpCommandProcessor
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## Summary
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Successfully wired `RdpCommandProcessor` into the Guacamole WebSocket handler to enable real-time analysis and policy enforcement of RDP session input events. This integration ensures that LLM-based analysis and security rules are applied to all user interactions through Guacamole-based RDP sessions.
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## Changes Made
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### 1. GuacamoleTunnelWebSocketHandler.java
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#### Added Dependencies
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- Injected `RdpCommandProcessor` for input event analysis
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- Added `ConnectedSystem` tracking per WebSocket session
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- Imported `ByteArrayOutputStream` for output stream handling
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#### New Functionality
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##### Guacamole Protocol Parsing
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- **`parseGuacamoleInstruction(String instruction)`**: Parses Guacamole protocol messages
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- Format: `<length>.<opcode>,<length>.<arg1>,<length>.<arg2>,...;`
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- Extracts opcode and arguments from instruction string
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- Returns `GuacamoleInstruction` object with opcode and args array
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##### Input Event Analysis
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- **`shouldAnalyzeInstruction(GuacamoleInstruction)`**: Determines if instruction needs analysis
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- Analyzes: `key`, `mouse`, `clipboard`, `file` instructions
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- Skips: `size`, `sync`, `ack`, and other non-input instructions
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##### Conversion to RdpInputEvent
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- **`convertToRdpInputEvent(GuacamoleInstruction)`**: Converts Guacamole instructions to `RdpInputEvent`
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- **key**: Keyboard events → `KEYBOARD` type with keysym and press state
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- **mouse**: Mouse events → `MOUSE_CLICK` or `MOUSE_MOVE` based on button mask
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- Button mask > 0: Click event
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- Button mask = 0: Move event
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- **clipboard**: Clipboard access → `KEYBOARD` type with clipboard data
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- **file**: File transfers → `KEYBOARD` type with file information
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##### Session Tracking
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- **`createConnectedSystemFromJwt(String, String)`**: Creates `ConnectedSystem` from JWT
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- Extracts user subject and target from JWT claims
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- Creates minimal `SessionLog`, `User`, and `HostSystem` objects
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- Enables RdpCommandProcessor to track session context
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##### Message Processing Flow
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Modified `handleTextMessage` to:
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1. Parse incoming Guacamole protocol message
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2. Check if message is an input event requiring analysis
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3. Convert to `RdpInputEvent` if applicable
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4. Call `rdpCommandProcessor.processInputEvent()` for policy enforcement
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5. Block message and send error if policy denies
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6. Forward to Guacamole tunnel if allowed
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##### Connection Lifecycle
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- **`afterConnectionEstablished`**: Create `ConnectedSystem` on connection
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- **`afterConnectionClosed`**: Clean up `ConnectedSystem` on disconnect
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### 2. GuacamoleTunnelWebSocketHandlerTest.java (NEW)
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Created comprehensive test suite with 6 test cases:
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1. **testHandleTextMessage_KeyboardInput_Allowed**: Verifies keyboard events are analyzed and allowed
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2. **testHandleTextMessage_KeyboardInput_Blocked**: Verifies blocked keyboard events don't reach tunnel
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3. **testHandleTextMessage_MouseClick_Analyzed**: Verifies mouse clicks are processed
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4. **testHandleTextMessage_MouseMove_Analyzed**: Verifies mouse movements are tracked
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5. **testHandleTextMessage_NonInputInstruction_NotAnalyzed**: Verifies non-input messages bypass analysis
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6. **testHandleTextMessage_ClipboardAccess_Analyzed**: Verifies clipboard operations are monitored
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All tests use proper mocking and verify:
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- RdpCommandProcessor is called for input events
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- Messages are forwarded or blocked appropriately
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- Error messages are sent to clients when blocked
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### 3. GUACAMOLE_INTEGRATION.md
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Updated documentation to include:
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- Real-time input analysis section with code examples
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- Guacamole protocol parsing table with instruction formats
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- List of monitored input event types
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- Policy enforcement action descriptions
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- Integration architecture details
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## Technical Details
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### Guacamole Protocol Format
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```
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<length>.<opcode>,<length>.<arg1>,<length>.<arg2>,...;
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```
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Examples:
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- Keyboard: `3.key,5.65307,1.1;` (Escape key pressed)
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- Mouse click: `5.mouse,3.100,3.200,1.1;` (Left click at 100,200)
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- Mouse move: `5.mouse,3.150,3.250,1.0;` (Move to 150,250)
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- Clipboard: `9.clipboard,10.text/plain,11.Hello World;`
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### Integration Flow
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```
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Browser Client (Guacamole JS)
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↓
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WebSocket Message (Guacamole Protocol)
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↓
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GuacamoleTunnelWebSocketHandler.handleTextMessage()
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↓
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parseGuacamoleInstruction() → GuacamoleInstruction
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↓
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shouldAnalyzeInstruction() → true/false
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↓ (if true)
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convertToRdpInputEvent() → RdpInputEvent
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↓
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RdpCommandProcessor.processInputEvent() → allowed/blocked
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↓
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Forward to tunnel (if allowed) OR Send error (if blocked)
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↓
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Guacamole Tunnel → guacd daemon → RDP Server
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```
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### Security Benefits
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1. **Real-time Analysis**: Every input event analyzed before reaching RDP server
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2. **Policy Enforcement**: Configurable allow/deny/warn actions
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3. **Behavioral Detection**: Identifies suspicious patterns (rapid clicking, automation)
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4. **Audit Trail**: All input events logged for compliance
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5. **LLM Integration**: Enables AI-powered threat detection
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6. **Session Tracking**: Full context available for policy decisions
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## Testing Results
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- **All 30 tests pass** (6 new + 24 existing)
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- **Build successful** with no compilation errors
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- **No breaking changes** to existing functionality
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## Deployment Considerations
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1. **Performance**: Minimal overhead - only input events analyzed
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2. **Backwards Compatible**: Non-input instructions forwarded directly
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3. **Graceful Degradation**: Falls back to basic ConnectedSystem if JWT parsing fails
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4. **Logging**: Appropriate debug/info/warn logging for troubleshooting
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## Future Enhancements
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1. **Enhanced ConnectedSystem**: Integrate with full session tracking service
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2. **Custom Analysis Rules**: Allow tenant-specific input filtering
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3. **ML-based Detection**: Train models on input patterns
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4. **Screen Content Analysis**: OCR and image recognition for displayed content
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5. **Multi-modal Analysis**: Combine input, screen, and session context
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## Files Modified
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- `rdp-proxy/src/main/java/io/sentrius/sso/rdpproxy/servlet/GuacamoleTunnelWebSocketHandler.java` (165 lines added)
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- `rdp-proxy/GUACAMOLE_INTEGRATION.md` (72 lines added)
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## Files Created
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- `rdp-proxy/src/test/java/io/sentrius/sso/rdpproxy/servlet/GuacamoleTunnelWebSocketHandlerTest.java` (276 lines)
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## Total Impact
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- **544 lines added** across 3 files
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- **1 line removed** from documentation
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- **Net: +543 lines**

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