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server.js
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server.js
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import fs from "node:fs/promises";
import crypto from "node:crypto";
import express from "express";
import bodyParser from "body-parser";
process.loadEnvFile();
const { SERVER_ADDR = "0.0.0.0", SERVER_PORT = 3000 } = process.env;
if (
!(await fs.stat("public.json").catch(() => null)) ||
!(await fs.stat("private.json").catch(() => null))
) {
const keyPair = crypto.generateKeyPairSync("rsa", {
modulusLength: 4096,
publicKeyEncoding: {
type: "spki",
format: "jwk",
},
privateKeyEncoding: {
type: "pkcs8",
format: "jwk",
cipher: "aes-256-cbc",
passphrase: "top secret",
},
});
await fs.writeFile("public.json", JSON.stringify(keyPair.publicKey));
await fs.writeFile("private.json", JSON.stringify(keyPair.privateKey));
}
const serverPrivateKey = await crypto.webcrypto.subtle.importKey(
"jwk",
JSON.parse(await fs.readFile("private.json")),
{
name: "RSA-OAEP",
modulusLength: 4096,
publicExponent: new Uint8Array([1, 0, 1]),
hash: "SHA-256",
},
true,
["decrypt"],
);
const app = express();
app.disable("x-powered-by");
app.set("trust proxy", 1);
app.use(
bodyParser.raw({
verify: (req, res, buf, encoding) => {
if (buf && buf.length) req.rawBody = buf.toString(encoding || "utf8");
},
}),
);
app.use(express.urlencoded({ extended: false }));
app.use(express.json());
await fs.mkdir("jwk", { recursive: true });
for (const e of await fs.readdir("jwk")) {
const uuid = e.replace(".json", "");
app.locals[uuid] = {
uuid,
publicKey: await crypto.webcrypto.subtle.importKey(
"jwk",
JSON.parse(await fs.readFile(`jwk/${e}`)).publicKey,
{
name: "RSA-OAEP",
modulusLength: 4096,
publicExponent: new Uint8Array([1, 0, 1]),
hash: "SHA-256",
},
true,
["encrypt"],
),
};
}
app.post("/hello", async (req, res) => {
try {
const publicKey = await crypto.webcrypto.subtle.importKey(
"jwk",
req.body,
{
name: "RSA-OAEP",
modulusLength: 4096,
publicExponent: new Uint8Array([1, 0, 1]),
hash: "SHA-256",
},
true,
["encrypt"],
);
const uuid = crypto.webcrypto.randomUUID();
const challenge = crypto.webcrypto.getRandomValues(new Uint8Array(32));
req.app.locals[uuid] = { publicKey, challenge };
const encryptedChallenge = await crypto.webcrypto.subtle.encrypt(
{ name: "RSA-OAEP" },
publicKey,
challenge,
);
return res.header({ uuid }).type("octet-stream").end(Buffer.from(encryptedChallenge));
} catch (e) {
return res.status(400).send(e.toString());
}
});
app.post("/ack", async (req, res) => {
if (
Buffer.from(new Uint8Array(req.app.locals[req.headers.uuid].challenge)).toString("hex") ===
Buffer.from(new Uint8Array(req.body)).toString("hex")
) {
await fs.writeFile(
`jwk/${req.headers.uuid}.json`,
JSON.stringify(
{
created: new Date().toISOString(),
uuid: req.headers.uuid,
ip: req.ip,
agent: req.headers["user-agent"],
publicKey: await crypto.webcrypto.subtle.exportKey(
"jwk",
req.app.locals[req.headers.uuid].publicKey,
),
},
null,
2,
),
);
return res.sendStatus(204);
}
return res.status(403);
});
app.get("/get", async (req, res) => {
await fs.utimes(`jwk/${req.headers.uuid}.json`, new Date(), new Date());
return res
.type("octet-stream")
.end(
Buffer.from(
await crypto.webcrypto.subtle.encrypt(
{ name: "RSA-OAEP" },
req.app.locals[req.headers.uuid].publicKey,
Buffer.from(
`pid: ${process.pid}, platform ${process.arch} ${
process.platform
} server time now is ${new Date().toISOString()}`,
),
),
),
);
});
app.post("/send", async (req, res) => {
return res.send(
await new TextDecoder().decode(
Buffer.from(
await crypto.webcrypto.subtle.decrypt({ name: "RSA-OAEP" }, serverPrivateKey, req.body),
),
),
);
});
app.get("/", async (req, res) => {
res.setHeader("Content-Type", "text/html");
return res.send(
(await fs.readFile("index.html", "utf8")).replace(
"const serverPublicJWT = null;",
`const serverPublicJWT = ${await fs.readFile("public.json")}`,
),
);
});
app.listen(SERVER_PORT, SERVER_ADDR, () =>
console.log(`Server listening on ${SERVER_ADDR}:${SERVER_PORT}`),
);