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refactor: moved checks to a separate security util, replaced crypto b…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| import type { H3Event } from 'h3' | ||
| import { subtle, getRandomValues } from 'uncrypto' | ||
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| export type OAuthChecks = 'pkce' | 'state' | ||
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| // From oauth4webapi https://github.com/panva/oauth4webapi/blob/4b46a7b4a4ca77a513774c94b718592fe3ad576f/src/index.ts#L567C1-L579C2 | ||
| const CHUNK_SIZE = 0x8000 | ||
| export function encodeBase64Url(input: Uint8Array | ArrayBuffer) { | ||
| if (input instanceof ArrayBuffer) { | ||
| input = new Uint8Array(input) | ||
| } | ||
|
|
||
| const arr = [] | ||
| for (let i = 0; i < input.byteLength; i += CHUNK_SIZE) { | ||
| // @ts-expect-error | ||
| arr.push(String.fromCharCode.apply(null, input.subarray(i, i + CHUNK_SIZE))) | ||
| } | ||
| return btoa(arr.join('')).replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_') | ||
| } | ||
|
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| function randomBytes() { | ||
| return encodeBase64Url(getRandomValues(new Uint8Array(32))) | ||
| } | ||
|
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| /** | ||
| * Generate a random `code_verifier` for use in the PKCE flow | ||
| * @see https://tools.ietf.org/html/rfc7636#section-4.1 | ||
| */ | ||
| export function generateCodeVerifier() { | ||
| return randomBytes() | ||
| } | ||
|
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| /** | ||
| * Generate a random `state` used to prevent CSRF attacks | ||
| * @see https://www.rfc-editor.org/rfc/rfc6749.html#section-4.1.1 | ||
| */ | ||
| export function generateState() { | ||
| return randomBytes() | ||
| } | ||
|
|
||
| /** | ||
| * Generate a `code_challenge` from a `code_verifier` for use in the PKCE flow | ||
| * @param verifier `code_verifier` string | ||
| * @returns `code_challenge` string | ||
| * @see https://tools.ietf.org/html/rfc7636#section-4.1 | ||
| */ | ||
| export async function pkceCodeChallenge(verifier: string) { | ||
| return encodeBase64Url(await subtle.digest({ name: 'SHA-256' }, new TextEncoder().encode(verifier))) | ||
| } | ||
|
|
||
| interface CheckUseResult { | ||
| code_verifier?: string | ||
| } | ||
| /** | ||
| * Checks for PKCE and state | ||
| */ | ||
| export const checks = { | ||
| /** | ||
| * Create checks | ||
| * @param event, H3Event | ||
| * @param checks, OAuthChecks[] a list of checks to create | ||
| * @returns Record<string, string> a map of check parameters to add to the authorization URL | ||
| */ | ||
| async create(event: H3Event, checks?: OAuthChecks[]) { | ||
| const res: Record<string, string> = {} | ||
| if (checks?.includes('pkce')) { | ||
| const pkceVerifier = generateCodeVerifier() | ||
| const pkceChallenge = await pkceCodeChallenge(pkceVerifier) | ||
| console.log('pkceVerifier', pkceVerifier) | ||
| console.log('pkceChallenge', pkceChallenge) | ||
| res['code_challenge'] = pkceChallenge | ||
| res['code_challenge_method'] = 'S256' | ||
| setCookie(event, 'nuxt-auth-util-verifier', pkceVerifier, { maxAge: 60 * 15, secure: true, httpOnly: true }) | ||
| } | ||
| if (checks?.includes('state')) { | ||
| res['state'] = generateState() | ||
| setCookie(event, 'nuxt-auth-util-state', res['state'], { maxAge: 60 * 15, secure: true, httpOnly: true }) | ||
| } | ||
| return res | ||
| }, | ||
| /** | ||
| * Use checks, verifying and returning the results | ||
| * @param event, H3Event | ||
| * @param checks, OAuthChecks[] a list of checks to use | ||
| * @returns CheckUseResult a map that can contain `code_verifier` if `pkce` was used to be used in the token exchange | ||
| */ | ||
| async use(event: H3Event, checks?: OAuthChecks[]) : Promise<CheckUseResult> { | ||
| const res: CheckUseResult = {} | ||
| const { state } = getQuery(event) | ||
| if (checks?.includes('pkce')) { | ||
| const pkceVerifier = getCookie(event, 'nuxt-auth-util-verifier') | ||
| setCookie(event, 'nuxt-auth-util-verifier', '', { maxAge: -1 }) | ||
| res['code_verifier'] = pkceVerifier | ||
| } | ||
| if (checks?.includes('state')) { | ||
| const stateInCookie = getCookie(event, 'nuxt-auth-util-state') | ||
| setCookie(event, 'nuxt-auth-util-state', '', { maxAge: -1 }) | ||
| if (checks?.includes('state')) { | ||
| if (!state || !stateInCookie) { | ||
| const error = createError({ | ||
| statusCode: 401, | ||
| message: 'Auth0 login failed: state is missing' | ||
| }) | ||
| throw error | ||
| } | ||
| if (state !== stateInCookie) { | ||
| const error = createError({ | ||
| statusCode: 401, | ||
| message: 'Auth0 login failed: state does not match' | ||
| }) | ||
| throw error | ||
| } | ||
| } | ||
| } | ||
| return res | ||
| }, | ||
| } |