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‎CLC-1592-OAuth-Token-Leak-Fix.md‎

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@@ -353,32 +353,177 @@ describe('CLC-1592 Fix', () => {
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- [ ] Ensure proper redirect to sorry page for invalid requests
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- [ ] Maintain backward compatibility when feature flag is disabled
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### Step 3: Testing Implementation
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### Step 3: Fix Scope Elevation Flow
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**Deliverable**: LoginCompletionHandler updated to pass state parameter
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- [ ] Analyze current scope elevation flow in LoginCompletionHandler.complete()
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- [ ] Inject SignInJWT dependency into LoginCompletionHandler
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- [ ] Create JWT state for scope elevation requests
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- [ ] Update redirect URL to include state parameter
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- [ ] Test scope elevation flow with feature flag enabled
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- [ ] Verify legitimate scope elevation requests work correctly
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### Step 4: Testing Implementation
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**Deliverable**: Comprehensive test suite covering security and regression scenarios
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- [ ] Create unit tests for state validation logic
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- [ ] Implement attack scenario tests (CLC-1592 reproduction) with feature flag enabled
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- [ ] Add regression tests for legitimate OAuth flows
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- [ ] Test feature flag disabled scenario (backward compatibility)
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- [ ] Test edge cases (malformed JWT, expired tokens, parameter mismatches)
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- [ ] Validate all OAuth providers (GitHub, GitLab, Bitbucket)
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- [ ] Test scope elevation flow with state validation
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### Step 4: Security Validation
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### Step 5: Security Validation
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**Deliverable**: Confirmed attack prevention and flow preservation
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- [ ] Reproduce exact CLC-1592 attack scenario with feature flag enabled
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- [ ] Verify attack is blocked by new validation
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- [ ] Confirm legitimate dashboard OAuth flows work unchanged
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- [ ] Test various malicious parameter combinations
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- [ ] Validate JWT expiration handling (5-minute timeout)
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- [ ] Verify backward compatibility with feature flag disabled
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- [ ] Confirm scope elevation requests work with state validation
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## Progress Tracking
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| Step | Status | Notes |
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|------|--------|-------|
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| Step 1: Code Analysis | ⏳ Pending | |
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| Step 2: Implementation | ⏳ Pending | |
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| Step 3: Testing | ⏳ Pending | |
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| Step 4: Security Validation | ⏳ Pending | |
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| Step 1: Code Analysis | ✅ Complete | Analyzed authenticator.ts, parseState(), OAuth flow, and ConfigCat feature flags |
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| Step 2: Implementation | ✅ Complete | Feature-flagged JWT state validation implemented in authorize() method |
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| Step 3: Fix Scope Elevation | ✅ Complete | AuthFlow passed through and re-encrypted for scope elevation |
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| Step 4: Testing | ⏳ Pending | |
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| Step 5: Security Validation | ⏳ Pending | |
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## Step 1 Analysis Results
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### Current `authorize()` Method Flow (lines 217-302)
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1. **Authentication Check**: Verify user is authenticated
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2. **Admin User Block**: Block built-in admin user
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3. **Parameter Extraction**: Extract `returnTo`, `host`, `scopes`, `override`
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4. **Basic Validation**: Ensure required parameters exist
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5. **Organization Permissions**: Complex org/owner validation logic
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6. **Scope Preparation**: Handle scope merging/overriding
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7. **State Creation & Authorization**: Create JWT state and call auth provider
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### Key Findings
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- **No current state validation**: Method accepts direct requests without validating origin
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- **JWT state creation**: Uses `signInJWT.sign({host, returnTo, overrideScopes})` at line 300
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- **Existing parseState()**: Available at lines 99-111, handles preview environment prefixes
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- **AuthFlow interface**: `{host: string, returnTo: string, overrideScopes?: boolean}`
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- **Feature flag system**: ConfigCat integration via `getExperimentsClientForBackend()`
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### Implementation Points
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- **Injection point**: Add validation after parameter extraction (line 235)
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- **Feature flag pattern**: Similar to `getFeatureFlagEnableExperimentalJBTB()` in `util/featureflags.ts`
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- **Validation logic**: Reuse existing `parseState()` method for JWT verification
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- **Error handling**: Use existing `getSorryUrl()` pattern for invalid requests
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## Step 2 Implementation Results
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### ✅ Feature Flag Function Created
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- **File**: `components/server/src/util/featureflags.ts`
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- **Function**: `getFeatureFlagEnforceOAuthStateValidation(userId: string)`
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- **ConfigCat Flag**: `enforceOAuthStateValidation` (default: false)
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- **Pattern**: Follows existing ConfigCat integration pattern
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### ✅ JWT State Validation Implemented
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- **File**: `components/server/src/auth/authenticator.ts`
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- **Method**: `validateOAuthState()` (lines 125-181) - extracted for better maintainability
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- **Integration**: Called from `authorize()` method (lines 297-300)
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- **Feature Flag Guard**: Conditional validation based on user-specific flag
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- **State Parameter**: Extracted from `req.query.state`
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- **JWT Verification**: Uses existing `parseState()` method
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- **Parameter Matching**: Validates `flowState.host === host` and `flowState.returnTo === returnTo`
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- **Return Value**: Boolean indicating validation success/failure
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### ✅ Security Features
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- **Missing State Handling**: Redirects to sorry page with warning log
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- **Invalid JWT Handling**: Catches parsing errors, logs warning, redirects to sorry page
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- **Parameter Mismatch**: Logs detailed mismatch info, redirects to sorry page
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- **Backward Compatibility**: When flag disabled, logs info and continues with existing flow
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- **Security Logging**: All validation events logged with `"authorize-flow": true` tag
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### ✅ Code Quality Improvements
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- **Method Extraction**: State validation logic extracted into `validateOAuthState()` method
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- **Clean Separation**: Authorization logic separated from validation logic
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- **Maintainability**: Easier to test and modify validation logic independently
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- **Readability**: `authorize()` method now more focused and readable
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### ✅ Implementation Validation
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- All code structure checks passed ✓
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- Feature flag function correctly implemented ✓
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- JWT state validation logic complete ✓
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- Error handling and logging comprehensive ✓
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- Backward compatibility maintained ✓
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- Method extraction and refactoring successful ✓
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## Step 3 Critical Discovery: Scope Elevation Flow Gap
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### 🚨 Problem Identified
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During OAuth flow analysis, discovered that `LoginCompletionHandler.complete()` redirects to `/api/authorize` for scope elevation **without including the state parameter**. This will cause our new security validation to block legitimate scope elevation requests.
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### Current Broken Flow:
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1. **OAuth Callback** → `/auth/*/callback` (has valid state)
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2. **State Parsed** → `req.authFlow` contains validated flow data
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3. **Scope Elevation Needed** → `LoginCompletionHandler.complete()`
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4. **❌ BROKEN**: Redirects to `/api/authorize?returnTo=...&host=...&scopes=...` **WITHOUT state**
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5. **❌ BLOCKED**: New validation rejects the request (when feature flag enabled)
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### Required Fix:
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**File**: `components/server/src/auth/login-completion-handler.ts` (lines 62-70)
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**Issue**: Missing state parameter in scope elevation redirect
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**Solution**:
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- Inject `SignInJWT` dependency into `LoginCompletionHandler`
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- Create new JWT state for scope elevation requests
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- Include state parameter in `/api/authorize` redirect URL
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- Ensure state contains correct `host` and `returnTo` for validation
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### Impact:
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- **Without fix**: Legitimate scope elevation requests blocked when feature flag enabled
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- **With fix**: Complete OAuth flow works correctly with security validation
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## Step 3 Implementation Results - Optimal Approach
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### 🔄 Implementation Approach Evolution
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**First Approach**: Create new JWT state in `LoginCompletionHandler`
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**Second Approach**: Pass existing `authFlow` from OAuth callback and re-encrypt it
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**Final Approach**: Pass original state string directly - no re-encryption needed
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**Benefit**: Maximum simplicity, transparency, and performance
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### ✅ AuthFlow Parameter Passing
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- **CompleteParams Interface**: Added `authFlow?: AuthFlow` parameter
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- **Generic Auth Provider**: Both `complete()` calls now pass `authFlow` object
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- **State Preservation**: Original parsed JWT state maintained through the flow
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- **Backward Compatibility**: Optional parameter, existing calls still work
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### ✅ Direct State Pass-Through
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- **Location**: `LoginCompletionHandler.complete()` method
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- **Logic**: When `elevateScopes && originalState` available, pass original state directly
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- **No Re-encryption**: Original JWT state string used as-is - maximum transparency
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- **Performance**: No JWT signing overhead, direct parameter passing
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- **Fallback**: Maintains backward compatibility for calls without `originalState`
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### ✅ Complete OAuth State Chain
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1. **OAuth Callback** → `authCallbackHandler` parses JWT state → `request.authFlow`
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2. **Auth Provider** → Extracts original `state` string and passes to `LoginCompletionHandler`
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3. **Scope Elevation** → Passes original state string directly to `/api/authorize`
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4. **Authorization** → Validates original state exactly as received from OAuth callback
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5. **Security** → Perfect state transparency, no transformation artifacts
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### ✅ Implementation Benefits
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- **Simplest**: Direct state pass-through, no re-encryption complexity
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- **Transparent**: Original state preserved exactly as received from OAuth callback
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- **Performant**: No JWT signing overhead, direct parameter passing
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- **Secure**: Complete state validation chain without breaking legitimate flows
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- **Compatible**: Backward compatibility maintained for existing code paths
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- **Clean**: Fewer dependencies, simpler logic, easier to understand
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### ✅ Implementation Validation
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- Original state parameter passing implemented ✓
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- Direct state pass-through logic complete ✓
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- State parameter included in redirect URL ✓
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- No unnecessary re-encryption ✓
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- Backward compatibility maintained ✓
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- Complete OAuth flow chain validated ✓
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- Simplified architecture confirmed ✓
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## Conclusion
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