Files
codex/codex-rs/app-server-protocol/schema/json/v1/InitializeParams.json
Jiaming Zhang 5f4d0ec343 [codex] request desktop attestation from app (#20619)
## Summary

TL;DR: teaches `codex-rs` / app-server to request a desktop-provided
attestation token and attach it as `x-oai-attestation` on the scoped
ChatGPT Codex request paths.

![DeviceCheck attestation
interface](https://raw.githubusercontent.com/openai/codex/dev/jm/devicecheck-diagram-assets/pr-assets/devicecheck-attestation-interface.png)

## Details

This PR teaches the Codex app-server runtime how to request and attach
an attestation token. It does not generate DeviceCheck tokens directly;
instead, it relies on the connected desktop app to advertise that it can
generate attestation and then asks that app for a fresh header value
when needed.

The flow is:

1. The Codex desktop app connects to app-server.
2. During `initialize`, the app can advertise that it supports
`requestAttestation`.
3. Before app-server calls selected ChatGPT Codex endpoints, it sends
the internal server request `attestation/generate` to the app.
4. app-server receives a pre-encoded header value back.
5. app-server forwards that value as `x-oai-attestation` on the scoped
outbound requests.

The code in this repo is mostly protocol and runtime plumbing: it adds
the app-server request/response shape, introduces an attestation
provider in core, wires that provider into Responses / compaction /
realtime setup paths, and covers the intended scoping with tests. The
signed macOS DeviceCheck generation remains owned by the desktop app PR.

## Related PR

- Codex desktop app implementation:
https://github.com/openai/openai/pull/878649

## Validation

<details>
<summary>Tests run</summary>

```sh
cargo test -p codex-app-server-protocol
cargo test -p codex-core attestation --lib
cargo test -p codex-app-server --lib attestation
```

Also ran:

```sh
just fix -p codex-core
just fix -p codex-app-server
just fix -p codex-app-server-protocol
just fmt
just write-app-server-schema
```

</details>

<details>
<summary>E2E DeviceCheck validation</summary>

First validated the signed desktop app boundary directly: launched a
packaged signed `Codex.app`, sent `attestation/generate`, decoded the
returned `v1.` attestation header, and validated the extracted
DeviceCheck token with `personal/jm/verify_devicecheck_token.py` using
bundle ID `com.openai.codex`. Apple returned `status_code: 200` and
`is_ok: true`.

Then ran the fuller app + app-server flow. The packaged `Codex.app`
launched a current-branch app-server via `CODEX_CLI_PATH`, and a local
MITM proxy intercepted outbound `chatgpt.com` traffic. The app-server
requested `attestation/generate` from the real Electron app process, and
the intercepted `/backend-api/codex/responses` traffic included
`x-oai-attestation` on both routes:

```text
GET  /backend-api/codex/responses  Upgrade: websocket  x-oai-attestation: present
POST /backend-api/codex/responses  Upgrade: none       x-oai-attestation: present
```

The captured header decoded to a DeviceCheck token that also validated
with Apple for `com.openai.codex` (`status_code: 200`, `is_ok: true`,
team `2DC432GLL2`).

</details>

---------

Co-authored-by: Codex <noreply@openai.com>
2026-05-08 12:36:02 -07:00

72 lines
1.6 KiB
JSON
Generated

{
"$schema": "http://json-schema.org/draft-07/schema#",
"definitions": {
"ClientInfo": {
"properties": {
"name": {
"type": "string"
},
"title": {
"type": [
"string",
"null"
]
},
"version": {
"type": "string"
}
},
"required": [
"name",
"version"
],
"type": "object"
},
"InitializeCapabilities": {
"description": "Client-declared capabilities negotiated during initialize.",
"properties": {
"experimentalApi": {
"default": false,
"description": "Opt into receiving experimental API methods and fields.",
"type": "boolean"
},
"optOutNotificationMethods": {
"description": "Exact notification method names that should be suppressed for this connection (for example `thread/started`).",
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"requestAttestation": {
"default": false,
"description": "Opt into `attestation/generate` requests for upstream `x-oai-attestation`.",
"type": "boolean"
}
},
"type": "object"
}
},
"properties": {
"capabilities": {
"anyOf": [
{
"$ref": "#/definitions/InitializeCapabilities"
},
{
"type": "null"
}
]
},
"clientInfo": {
"$ref": "#/definitions/ClientInfo"
}
},
"required": [
"clientInfo"
],
"title": "InitializeParams",
"type": "object"
}