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import * as crypto from "crypto"
import * as randomstring from "randomstring"
import { User } from "../db/model/User"
import * as db from "../db/db"
import {
CLOUDFLARE_AUD,
SECRET_KEY,
SESSION_COOKIE_AGE,
} from "../settings/serverSettings"
import { BCryptHasher } from "../db/hashers"
import fetch from "node-fetch"
import { Secret, verify } from "jsonwebtoken"
import { ADMIN_BASE_URL, ENV } from "../settings/serverSettings"
import { JsonError } from "../clientUtils/owidTypes"
export type CurrentUser = User
export type Request = express.Request
export interface Response extends express.Response {
locals: { user: CurrentUser; session: Session }
}
interface Session {
id: string
expiryDate: Date
}
const CLOUDFLARE_COOKIE_NAME = "CF_Authorization"
/*
* See authentication.php for detailed descriptions.
*/
export async function authCloudflareSSOMiddleware(
req: express.Request,
res: express.Response,
next: express.NextFunction
) {
const jwt = req.cookies[CLOUDFLARE_COOKIE_NAME]
if (!jwt) return next()
const audTag = CLOUDFLARE_AUD
if (!audTag) {
console.error(
"Missing or empty audience tag. Please add CLOUDFLARE_AUD key in settings."
)
return next()
}
// Get the Cloudflare public key
const certsUrl = "https://owid.cloudflareaccess.com/cdn-cgi/access/certs"
const response = await fetch(certsUrl)
const certs = await response.json()
const publicCerts = certs.public_certs
if (!publicCerts) {
console.error("Missing public certificates from Cloudflare.")
return next()
}
// Verify the JWT token
let certVerificationErr
let payload: any
const verified = publicCerts.some((certObj: { cert: Secret }) => {
try {
payload = verify(jwt, certObj.cert, {
audience: audTag,
algorithms: ["RS256"],
})
return true
} catch (err) {
certVerificationErr = err
}
return false
})
if (!verified) {
// Authorization token invalid: verification failed, token expired or wrong audience.
console.error(certVerificationErr)
return next()
}
if (!payload.email) {
console.error("Missing email in JWT claims.")
return next()
}
const user = await User.findOne({ email: payload.email })
if (!user) return next("User not found. Please contact an administrator.")
// Authenticate as the user stored in the token
const { id: sessionId } = await logInAsUser(user)
res.cookie("sessionid", sessionId, {
httpOnly: true,
sameSite: "lax",
secure: ENV === "production",
})
// Prevents redirect to external URLs
let redirectTo = "/admin"
if (req.query.next) {
try {
redirectTo = new URL(req.query.next, ADMIN_BASE_URL).pathname
} catch (err) {
console.error(err)
}
}
return res.redirect(redirectTo)
}
export async function logOut(
req: express.Request,
res: express.Response,
next: express.NextFunction
) {
if (res.locals.user)
await db.queryMysql(`DELETE FROM sessions WHERE session_key = ?`, [
res.locals.session.id,
])
res.clearCookie("sessionid")
res.clearCookie(CLOUDFLARE_COOKIE_NAME)
return res.redirect("/admin")
}
export async function authMiddleware(
req: express.Request,
res: express.Response,
next: express.NextFunction
) {
let user: CurrentUser | undefined
let session: Session | undefined
const sessionid = req.cookies["sessionid"]
if (sessionid) {
// Expire old sessions
await db.execute("DELETE FROM sessions WHERE expire_date < NOW()")
const rows = await db.queryMysql(
`SELECT * FROM sessions WHERE session_key = ?`,
[sessionid]
)
if (rows.length) {
const sessionData = Buffer.from(
rows[0].session_data,
"base64"
).toString("utf8")
const sessionJson = JSON.parse(
sessionData.split(":").slice(1).join(":")
)
user = await User.findOne({ email: sessionJson.user_email })
if (!user)
throw new JsonError("Invalid session (no such user)", 500)
session = { id: sessionid, expiryDate: rows[0].expiry_date }
// Don't await this
user.lastSeen = new Date()
user.save()
}
}
// Authed urls shouldn't be cached
res.set("Cache-Control", "public, max-age=0, must-revalidate")
if (user && user.isActive) {
res.locals.session = session
res.locals.user = user
return next()
} else if (
!req.path.startsWith("/admin") ||
req.path === "/admin/login" ||
req.path === "/admin/register"
)
return next()
return res.redirect(`/admin/login?next=${encodeURIComponent(req.url)}`)
}
function saltedHmac(salt: string, value: string): string {
const hmac = crypto.createHmac("sha1", salt + SECRET_KEY)
hmac.update(value)
return hmac.digest("hex")
}
async function logInAsUser(user: User) {
const sessionId = randomstring.generate()
const sessionJson = JSON.stringify({
user_email: user.email,
})
const sessionHash = saltedHmac(
"django.contrib.sessions.SessionStore",
sessionJson
)
const sessionData = Buffer.from(`${sessionHash}:${sessionJson}`).toString(
"base64"
)
const now = new Date()
const expiryDate = new Date(now.getTime() + 1000 * SESSION_COOKIE_AGE)
await db.execute(
`INSERT INTO sessions (session_key, session_data, expire_date) VALUES (?, ?, ?)`,
[sessionId, sessionData, expiryDate]
)
user.lastLogin = now
await user.save()
return { id: sessionId, expiryDate: expiryDate }
}
export async function logInWithCredentials(
email: string,
password: string
): Promise<Session> {
const user = await User.findOne({ email: email })
if (!user) throw new Error("No such user")
const hasher = new BCryptHasher()
if (await hasher.verify(password, user.password))
// Login successful
return logInAsUser(user)
throw new Error("Invalid password")
}
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