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import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import * as ssrf from "../../infra/net/ssrf.js";
import { type FetchMock, withFetchPreconnect } from "../../test-utils/fetch-mock.js";
import { createWebFetchTool } from "./web-fetch.js";
import { makeFetchHeaders } from "./web-fetch.test-harness.js";
import "./web-fetch.test-mocks.js";
const lookupMock = vi.fn();
const resolvePinnedHostname = ssrf.resolvePinnedHostname;
function redirectResponse(location: string): Response {
return {
ok: false,
status: 302,
headers: makeFetchHeaders({ location }),
body: { cancel: vi.fn() },
} as unknown as Response;
}
function textResponse(body: string): Response {
return {
ok: true,
status: 200,
headers: makeFetchHeaders({ "content-type": "text/plain" }),
text: async () => body,
} as unknown as Response;
}
function setMockFetch(
impl: FetchMock = async (_input: RequestInfo | URL, _init?: RequestInit) => textResponse("") ,
) {
const fetchSpy = vi.fn(impl);
global.fetch = withFetchPreconnect(fetchSpy);
return fetchSpy;
}
function createWebFetchToolForTest(params?: {
firecrawlApiKey?: string;
ssrfPolicy?: { allowRfc2544BenchmarkRange?: boolean };
cacheTtlMinutes?: number;
}) {
return createWebFetchTool({
config: {
plugins: params?.firecrawlApiKey
? {
entries: {
firecrawl: {
config: {
webFetch: {
apiKey: params.firecrawlApiKey,
},
},
},
},
}
: undefined,
tools: {
web: {
fetch: {
cacheTtlMinutes: params?.cacheTtlMinutes ?? 0,
ssrfPolicy: params?.ssrfPolicy,
...(params?.firecrawlApiKey ? { provider: "firecrawl" } : {}),
},
},
},
},
lookupFn: lookupMock,
});
}
async function expectBlockedUrl(
tool: ReturnType<typeof createWebFetchToolForTest>,
url: string,
expectedMessage: RegExp,
) {
await expect(tool?.execute?.("call", { url })).rejects.toThrow(expectedMessage);
}
describe("web_fetch SSRF protection", () => {
const priorFetch = global.fetch;
beforeEach(() => {
vi.spyOn(ssrf, "resolvePinnedHostname").mockImplementation((hostname) =>
resolvePinnedHostname(hostname, lookupMock),
);
});
afterEach(() => {
global.fetch = priorFetch;
lookupMock.mockClear();
vi.restoreAllMocks();
});
it("blocks localhost hostnames before fetch/firecrawl", async () => {
const fetchSpy = setMockFetch();
const tool = createWebFetchToolForTest({
firecrawlApiKey: "firecrawl-test", // pragma: allowlist secret
});
await expectBlockedUrl(tool, "http://localhost/test", /Blocked hostname/i);
expect(fetchSpy).not.toHaveBeenCalled();
expect(lookupMock).not.toHaveBeenCalled();
});
it("blocks private IP literals without DNS", async () => {
const fetchSpy = setMockFetch();
const tool = createWebFetchToolForTest();
const cases = ["http://127.0.0.1/test", "http://[::ffff:127.0.0.1]/"] as const;
for (const url of cases) {
await expectBlockedUrl(tool, url, /private|internal|blocked/i);
}
expect(fetchSpy).not.toHaveBeenCalled();
expect(lookupMock).not.toHaveBeenCalled();
});
it("blocks when DNS resolves to private addresses", async () => {
lookupMock.mockImplementation(async (hostname: string) => {
if (hostname === "public.test") {
return [{ address: "93.184.216.34", family: 4 }];
}
return [{ address: "10.0.0.5", family: 4 }];
});
const fetchSpy = setMockFetch();
const tool = createWebFetchToolForTest();
await expectBlockedUrl(tool, "https://private.test/resource", /private|internal|blocked/i);
expect(fetchSpy).not.toHaveBeenCalled();
});
it("blocks redirects to private hosts", async () => {
lookupMock.mockResolvedValue([{ address: "93.184.216.34", family: 4 }]);
const fetchSpy = setMockFetch().mockResolvedValueOnce(
redirectResponse("http://127.0.0.1/secret"),
);
const tool = createWebFetchToolForTest({
firecrawlApiKey: "firecrawl-test", // pragma: allowlist secret
});
await expectBlockedUrl(tool, "https://example.com", /private|internal|blocked/i);
expect(fetchSpy).toHaveBeenCalledTimes(1);
});
it("allows public hosts", async () => {
lookupMock.mockResolvedValue([{ address: "93.184.216.34", family: 4 }]);
setMockFetch().mockResolvedValue(textResponse("ok"));
const tool = createWebFetchToolForTest();
const result = await tool?.execute?.("call", { url: "https://example.com" });
expect(result?.details).toMatchObject({
status: 200,
extractor: "raw",
});
});
it("allows RFC2544 benchmark-range URLs only when web_fetch ssrfPolicy opts in", async () => {
const url = "http://198.18.0.153/file";
lookupMock.mockResolvedValue([{ address: "198.18.0.153", family: 4 }]);
const deniedTool = createWebFetchToolForTest({ cacheTtlMinutes: 1 });
await expectBlockedUrl(deniedTool, url, /private|internal|blocked/i);
const fetchSpy = setMockFetch().mockResolvedValue(textResponse("benchmark ok"));
const allowedTool = createWebFetchToolForTest({
ssrfPolicy: { allowRfc2544BenchmarkRange: true },
cacheTtlMinutes: 1,
});
const allowed = await allowedTool?.execute?.("call", { url });
expect(allowed?.details).toMatchObject({
status: 200,
extractor: "raw",
});
expect(fetchSpy).toHaveBeenCalledTimes(1);
const stricterTool = createWebFetchToolForTest({ cacheTtlMinutes: 1 });
await expectBlockedUrl(stricterTool, url, /private|internal|blocked/i);
});
});
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