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Anthropic workload identity federation #551

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21 changes: 20 additions & 1 deletion packages/proxy/src/providers/anthropic.test.ts
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Original file line number Diff line number Diff line change
@@ -1,11 +1,12 @@
import { it, expect, describe } from "vitest";
import { callProxyV1, createCapturingFetch } from "../../utils/tests";
import { FetchFn } from "../proxy";
import { anthropicAuthHeaders, FetchFn } from "../proxy";
import {
OpenAIChatCompletion,
OpenAIChatCompletionChunk,
OpenAIChatCompletionCreateParams,
} from "@types";
import { APISecretSchema } from "@schema";
import { omitUnsupportedAnthropicParams } from "./anthropic";
import {
IMAGE_DATA_URL,
Expand Down Expand Up @@ -72,6 +73,24 @@ it("should request identity encoding for streaming Anthropic chat completions",
expect(requests[0].headers["accept-encoding"]).toBe("identity");
});

it("should use bearer authorization for Anthropic WIF secrets", () => {
const headers = anthropicAuthHeaders(
APISecretSchema.parse({
type: "anthropic",
secret: "test-wif-access-token",
name: "anthropic",
metadata: {
auth_type: "oauth_bearer",
auth_source: "anthropic_workload_identity_federation",
},
}),
);

expect(headers).toEqual({
authorization: "Bearer test-wif-access-token",
});
});

it("should mark streaming responses as no-transform", async () => {
const encoder = new TextEncoder();
const anthropicEvents = [
Expand Down
28 changes: 26 additions & 2 deletions packages/proxy/src/proxy.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -165,6 +165,30 @@ const GOOGLE_URL_REGEX =

const GOOGLE_API_KEY_HEADER = "x-goog-api-key";

function isAnthropicOAuthBearerSecret(secret: APISecret) {
return (
secret.type === "anthropic" &&
secret.metadata !== null &&
secret.metadata !== undefined &&
"auth_type" in secret.metadata &&
secret.metadata.auth_type === "oauth_bearer"
);
}

export function anthropicAuthHeaders(
secret: APISecret,
): Record<string, string> {
if (isAnthropicOAuthBearerSecret(secret)) {
return {
authorization: `Bearer ${secret.secret}`,
};
}

return {
"x-api-key": secret.secret,
};
}

// Options to control how the cache key is generated.
export interface CacheKeyOptions {
excludeAuthToken?: boolean;
Expand Down Expand Up @@ -2666,7 +2690,7 @@ async function fetchAnthropicMessages({
{
method: "POST",
headers: {
"x-api-key": secret.secret,
...anthropicAuthHeaders(secret),
"content-type": "application/json",
"anthropic-version": "2023-06-01",
},
Expand Down Expand Up @@ -2769,7 +2793,7 @@ async function fetchAnthropicChatCompletions({
headers["accept"] = "application/json";
headers["anthropic-version"] = "2023-06-01";
headers["host"] = fullURL.host;
headers["x-api-key"] = secret.secret;
Object.assign(headers, anthropicAuthHeaders(secret));
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@chatgpt-codex-connector chatgpt-codex-connector Bot May 11, 2026

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P1 Badge Drop stale x-api-key before setting Anthropic bearer auth

In the /chat/completions Anthropic path, this line only merges authorization for WIF secrets, but the mutable headers object can already contain the caller's proxy auth x-api-key. When clients authenticate to this proxy with x-api-key, that token is forwarded upstream together with the new bearer token, which can break Anthropic auth and leaks the proxy credential to the model provider. Clear x-api-key before applying bearer auth for this flow.

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}

if (isEmpty(bodyData)) {
Expand Down
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