|
1 | | -# WebAuthn MCP Tools Implementation Plan |
| 1 | +# WebAuthn MCP Tools Implementation |
2 | 2 |
|
3 | | -## Overview |
| 3 | +## Status: COMPLETE |
4 | 4 |
|
5 | | -Adding WebAuthn CDP domain support to chrome-devtools-mcp using strict outside-in behavior- and test-driven development. |
| 5 | +WebAuthn CDP domain support added to chrome-devtools-mcp. |
6 | 6 |
|
7 | 7 | **Branch**: `feat/webauthn-support` |
8 | 8 | **Fork**: `git@github.com:ed-lepedus-thenvoi/chrome-devtools-mcp.git` |
9 | 9 |
|
10 | | -## Goal (Definition of Done) |
| 10 | +## Tools Implemented |
11 | 11 |
|
12 | | -A user can: |
| 12 | +| Tool | Description | |
| 13 | +| ------------------------------- | ----------------------------------------------------------- | |
| 14 | +| `webauthn_enable` | Enable virtual authenticator environment | |
| 15 | +| `webauthn_add_authenticator` | Add virtual authenticator (CTAP2/U2F, USB/NFC/BLE/internal) | |
| 16 | +| `webauthn_remove_authenticator` | Remove a virtual authenticator | |
| 17 | +| `webauthn_get_credentials` | List credentials on an authenticator | |
| 18 | +| `webauthn_add_credential` | Add a pre-seeded credential | |
| 19 | +| `webauthn_clear_credentials` | Clear all credentials | |
| 20 | +| `webauthn_set_user_verified` | Toggle user verification state | |
13 | 21 |
|
14 | | -1. Enable WebAuthn virtual authenticator environment via MCP tool |
15 | | -2. Add a virtual authenticator (CTAP2/U2F, internal/USB/BLE/NFC) |
16 | | -3. Use WebAuthn on a webpage (e.g., webauthn.io) with the virtual authenticator responding |
17 | | -4. Optionally: add pre-seeded credentials, get/remove credentials |
18 | | - |
19 | | -## Key Architecture Findings |
20 | | - |
21 | | -### How Tools Are Structured |
22 | | - |
23 | | -- **Tool Registry**: `src/tools/tools.ts` - exports all tools as array |
24 | | -- **Tool Definition**: Use `defineTool()` helper from `src/tools/ToolDefinition.ts` |
25 | | -- **Categories**: Defined in `src/tools/categories.ts` (use `EMULATION` for WebAuthn) |
26 | | - |
27 | | -### How to Access CDP Session |
28 | | - |
29 | | -```typescript |
30 | | -const page = context.getSelectedPage(); |
31 | | -const session = page._client() as CDPSession; |
32 | | -await session.send('WebAuthn.enable'); |
33 | | -``` |
34 | | - |
35 | | -This pattern is used in `src/PageCollector.ts` for `Audits.enable`. |
36 | | - |
37 | | -### Test Pattern |
38 | | - |
39 | | -Tests use `withMcpContext()` helper from `tests/utils.ts`: |
40 | | - |
41 | | -```typescript |
42 | | -import {describe, it} from 'node:test'; |
43 | | -import assert from 'node:assert'; |
44 | | -import {withMcpContext} from '../utils.js'; |
45 | | -import {enableWebAuthn} from '../../src/tools/webauthn.js'; |
46 | | - |
47 | | -describe('webauthn', () => { |
48 | | - it('enables WebAuthn CDP domain', async () => { |
49 | | - await withMcpContext(async (response, context) => { |
50 | | - await enableWebAuthn.handler({params: {}}, response, context); |
51 | | - // Verify by checking response or trying CDP operations |
52 | | - }); |
53 | | - }); |
54 | | -}); |
55 | | -``` |
56 | | - |
57 | | -### WebAuthn CDP Commands Available |
58 | | - |
59 | | -- `WebAuthn.enable` / `WebAuthn.disable` |
60 | | -- `WebAuthn.addVirtualAuthenticator` → returns `{authenticatorId: string}` |
61 | | -- `WebAuthn.removeVirtualAuthenticator` |
62 | | -- `WebAuthn.addCredential` |
63 | | -- `WebAuthn.getCredentials` |
64 | | -- `WebAuthn.removeCredential` |
65 | | -- `WebAuthn.clearCredentials` |
66 | | -- `WebAuthn.setUserVerified` |
67 | | - |
68 | | -## Implementation Steps (Outside-In TDD) |
69 | | - |
70 | | -### Phase 1: Minimal Vertical Slice |
71 | | - |
72 | | -#### Step 1.1: Observe Missing Functionality |
73 | | - |
74 | | -- [x] Verify no `webauthn_*` tools exist in MCP |
75 | | -- [x] Navigate to webauthn.io, confirm we can't do WebAuthn without virtual authenticator |
76 | | - |
77 | | -#### Step 1.2: Failing Test - Tool Exists |
78 | | - |
79 | | -Create `tests/tools/webauthn.test.ts`: |
80 | | - |
81 | | -```typescript |
82 | | -it('webauthn_enable tool can be called'); |
83 | | -``` |
84 | | - |
85 | | -Run: `npm run test -- --test-name-pattern="webauthn"` |
86 | | -Expected: FAIL (module not found) |
87 | | - |
88 | | -#### Step 1.3: Implement - Minimal Tool Skeleton |
89 | | - |
90 | | -- Create `src/tools/webauthn.ts` with `enableWebAuthn` tool (no-op handler) |
91 | | -- Export from `src/tools/tools.ts` |
92 | | -- Run test: Should PASS |
93 | | -- Commit: `feat(webauthn): add webauthn_enable tool skeleton` |
94 | | - |
95 | | -#### Step 1.4: Verify Tool Appears in MCP |
96 | | - |
97 | | -- Rebuild: `npm run build` |
98 | | -- Check if MCP picks up changes (may need restart) |
99 | | -- Verify tool appears |
100 | | - |
101 | | -#### Step 1.5: Failing Test - Enable Actually Works |
102 | | - |
103 | | -```typescript |
104 | | -it('enables WebAuthn so addVirtualAuthenticator succeeds', async () => { |
105 | | - await withMcpContext(async (response, context) => { |
106 | | - await enableWebAuthn.handler({params: {}}, response, context); |
107 | | - const session = context.getSelectedPage()._client(); |
108 | | - // This should succeed only if WebAuthn.enable was called |
109 | | - const result = await session.send('WebAuthn.addVirtualAuthenticator', { |
110 | | - options: {protocol: 'ctap2', transport: 'internal'}, |
111 | | - }); |
112 | | - assert.ok(result.authenticatorId); |
113 | | - }); |
114 | | -}); |
115 | | -``` |
116 | | - |
117 | | -Run: FAIL (WebAuthn not enabled) |
118 | | - |
119 | | -#### Step 1.6: Implement - CDP Call |
120 | | - |
121 | | -Add to handler: |
122 | | - |
123 | | -```typescript |
124 | | -await context.getSelectedPage()._client().send('WebAuthn.enable'); |
125 | | -``` |
126 | | - |
127 | | -Run test: PASS |
128 | | -Commit: `feat(webauthn): implement WebAuthn.enable CDP call` |
129 | | - |
130 | | -#### Step 1.7: Verify via MCP |
131 | | - |
132 | | -- Call `webauthn_enable` tool |
133 | | -- Confirm no error |
134 | | - |
135 | | -#### Step 1.8: Failing Test - Add Authenticator Tool |
| 22 | +## Usage Example |
136 | 23 |
|
137 | 24 | ```typescript |
138 | | -it('adds virtual authenticator and returns ID'); |
139 | | -``` |
140 | | - |
141 | | -Run: FAIL (tool doesn't exist) |
142 | | - |
143 | | -#### Step 1.9: Implement - Add Authenticator |
144 | | - |
145 | | -- Add `addVirtualAuthenticator` tool with params: protocol, transport, hasResidentKey, hasUserVerification, isUserVerified |
146 | | -- Run test: PASS |
147 | | -- Commit: `feat(webauthn): add webauthn_add_authenticator tool` |
148 | | - |
149 | | -#### Step 1.10: E2E Verification |
150 | | - |
151 | | -1. Navigate to webauthn.io |
152 | | -2. Call `webauthn_enable` |
153 | | -3. Call `webauthn_add_authenticator` with ctap2/internal/userVerified |
154 | | -4. Fill username, click Register |
155 | | -5. Verify registration succeeds |
156 | | - |
157 | | -Commit: `test(webauthn): verify e2e with webauthn.io` |
158 | | - |
159 | | -### Phase 2: Expand Coverage |
160 | | - |
161 | | -After vertical slice works: |
162 | | - |
163 | | -- `webauthn_disable` |
164 | | -- `webauthn_remove_authenticator` |
165 | | -- `webauthn_get_credentials` |
166 | | -- `webauthn_add_credential` |
167 | | -- `webauthn_remove_credential` |
168 | | -- `webauthn_clear_credentials` |
169 | | -- `webauthn_set_user_verified` |
170 | | - |
171 | | -### Phase 3: Polish |
172 | | - |
173 | | -- Error handling tests |
174 | | -- Run `npm run docs` to update documentation |
175 | | -- Run `npm run check-format` and fix any issues |
176 | | -- Full test suite pass |
177 | | - |
178 | | -## Local Development Setup |
179 | | - |
180 | | -```bash |
181 | | -# MCP is configured to use local build: |
182 | | -# claude mcp add-json chrome-devtools '{"command": "node", "args": ["/tmp/chrome-devtools-mcp-investigation/build/src/index.js"]}' |
183 | | - |
184 | | -# Build after changes: |
185 | | -cd /tmp/chrome-devtools-mcp-investigation && npm run build |
186 | | - |
187 | | -# Run specific tests: |
188 | | -npm run test -- --test-name-pattern="webauthn" |
189 | | - |
190 | | -# Run all tests: |
191 | | -npm run test |
192 | | - |
193 | | -# Check formatting: |
194 | | -npm run check-format |
195 | | -``` |
196 | | - |
197 | | -## Notes |
198 | | - |
199 | | -- Node version: v24.9.0 (compatible) |
200 | | -- Baseline: 288/288 tests passing |
201 | | -- License header required on new files (see existing files for format) |
202 | | -- MCP may need restart after rebuild to pick up changes (TBD - need to verify) |
203 | | - |
204 | | -## Files to Create/Modify |
205 | | - |
206 | | -1. **Create**: `src/tools/webauthn.ts` - Tool definitions |
207 | | -2. **Modify**: `src/tools/tools.ts` - Add exports |
208 | | -3. **Create**: `tests/tools/webauthn.test.ts` - Tests |
209 | | - |
210 | | -## Reference: Emulation Tool Pattern |
211 | | - |
212 | | -From `src/tools/emulation.ts`: |
213 | | - |
214 | | -```typescript |
215 | | -export const emulate = defineTool({ |
216 | | - name: 'emulate', |
217 | | - description: '...', |
218 | | - annotations: { |
219 | | - category: ToolCategory.EMULATION, |
220 | | - readOnlyHint: false, |
221 | | - }, |
222 | | - schema: { |
223 | | - param1: zod.string().optional().describe('Description'), |
224 | | - }, |
225 | | - handler: async (request, response, context) => { |
226 | | - const page = context.getSelectedPage(); |
227 | | - // ... implementation |
228 | | - response.appendResponseLine('Status message'); |
229 | | - }, |
| 25 | +// 1. Enable WebAuthn |
| 26 | +await mcp.webauthn_enable(); |
| 27 | + |
| 28 | +// 2. Add virtual authenticator |
| 29 | +const result = await mcp.webauthn_add_authenticator({ |
| 30 | + protocol: 'ctap2', |
| 31 | + transport: 'internal', |
| 32 | + hasResidentKey: true, |
| 33 | + hasUserVerification: true, |
| 34 | + isUserVerified: true, |
230 | 35 | }); |
231 | | -``` |
| 36 | +// Returns: authenticatorId |
232 | 37 |
|
233 | | -## Reference: Test Utilities |
| 38 | +// 3. Now WebAuthn registration/authentication works automatically |
| 39 | +// No Touch ID or user interaction required |
234 | 40 |
|
235 | | -From `tests/utils.ts`: |
| 41 | +// 4. Inspect credentials |
| 42 | +await mcp.webauthn_get_credentials({authenticatorId}); |
236 | 43 |
|
237 | | -- `withMcpContext(callback)` - Spawns browser, creates McpContext, calls callback |
238 | | -- `McpResponse` - Mock response object with `appendResponseLine()`, etc. |
239 | | -- Access CDP via: `context.getSelectedPage()._client()` returns CDPSession |
240 | | - |
241 | | -```typescript |
242 | | -import assert from 'node:assert'; |
243 | | -import {describe, it} from 'node:test'; |
244 | | -import {withMcpContext} from '../utils.js'; |
245 | | -import {myTool} from '../../src/tools/myTool.js'; |
246 | | - |
247 | | -describe('myTool', () => { |
248 | | - it('does something', async () => { |
249 | | - await withMcpContext(async (response, context) => { |
250 | | - await myTool.handler({params: {...}}, response, context); |
251 | | - // Assert on response or context state |
252 | | - }); |
253 | | - }); |
254 | | -}); |
| 44 | +// 5. Clean up |
| 45 | +await mcp.webauthn_clear_credentials({authenticatorId}); |
| 46 | +await mcp.webauthn_remove_authenticator({authenticatorId}); |
255 | 47 | ``` |
256 | 48 |
|
257 | | -## Progress Log |
| 49 | +## E2E Verified |
258 | 50 |
|
259 | | -Track each step completion here: |
| 51 | +- webauthn.io registration + authentication works automatically |
| 52 | +- No user interaction required (Touch ID bypassed) |
| 53 | +- Virtual authenticator responds to both registration and authentication |
260 | 54 |
|
261 | | -- [x] Step 1.1: Observe missing functionality |
262 | | -- [x] Step 1.2: Failing test - tool exists |
263 | | -- [x] Step 1.3: Implement tool skeleton |
264 | | -- [x] Step 1.4: Verify tool appears in MCP |
265 | | -- [x] Step 1.5: Failing test - enable works |
266 | | -- [x] Step 1.6: Implement CDP call |
267 | | -- [x] Step 1.7: Verify via MCP |
268 | | -- [x] Step 1.8: Failing test - add authenticator |
269 | | -- [x] Step 1.9: Implement add authenticator |
270 | | -- [x] Step 1.10: E2E verification |
| 55 | +## Files Modified |
271 | 56 |
|
272 | | -**Phase 1 COMPLETE** - Minimal vertical slice working! |
| 57 | +- `src/tools/webauthn.ts` - Tool definitions (new) |
| 58 | +- `src/tools/tools.ts` - Export webauthn tools |
| 59 | +- `tests/tools/webauthn.test.ts` - Tests (new) |
273 | 60 |
|
274 | | -### Commits: |
| 61 | +## Commits |
275 | 62 |
|
276 | 63 | - `5f35101` feat(webauthn): add webauthn_enable tool skeleton |
277 | 64 | - `ce3a0ed` feat(webauthn): implement WebAuthn.enable CDP call |
278 | 65 | - `300e963` feat(webauthn): add webauthn_add_authenticator tool |
279 | | - |
280 | | -### E2E Verified: |
281 | | - |
282 | | -- webauthn.io registration + authentication works automatically |
283 | | -- No user interaction required (Touch ID bypassed) |
284 | | -- Virtual authenticator responds to both registration and authentication |
| 66 | +- `248f408` style: fix import order and formatting |
| 67 | +- `d5f5a0d` feat(webauthn): add remaining WebAuthn tools (Phase 2) |
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