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mod_auth_token/token_auth_utils.lib.lua @ 5669:d67980d9e12d
mod_http_oauth2: Apply refresh token ttl to refresh token instead of grant
The intent in 59d5fc50f602 was for refresh tokens to extend the lifetime
of the grant, but the refresh token ttl was applied to the grant and
mod_tokenauth does not change it, leading to the grant expiring
regardless of refresh token usage.
This makes grant lifetimes unlimited, which seems to be standard
practice in the wild.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Mon, 11 Sep 2023 10:48:31 +0200 |
parent | 3693:0fb12a4b6106 |
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local base64 = require "util.encodings".base64; local hmac = require "openssl.hmac"; local luatz = require "luatz"; local otp = require "otp"; local DIGEST_TYPE = "SHA256"; local OTP_DEVIATION = 1; local OTP_DIGITS = 8; local OTP_INTERVAL = 30; local nonce_cache = {}; local function check_nonce(jid, otp_value, nonce) -- We cache all nonces used per OTP, to ensure that a token cannot be used -- more than once. -- -- We assume that the OTP is valid in the current time window. This is the -- case because we only call check_nonce *after* the OTP has been verified. -- -- We only store one OTP per JID, so if a new OTP comes in, we wipe the -- previous OTP and its cached nonces. if nonce_cache[jid] == nil or nonce_cache[jid][otp_value] == nil then nonce_cache[jid] = {} nonce_cache[jid][otp_value] = {} nonce_cache[jid][otp_value][nonce] = true return true; end if nonce_cache[jid][otp_value][nonce] == true then return false; else nonce_cache[jid][otp_value][nonce] = true; return true; end end local function verify_token(username, password, otp_seed, token_secret, log) local totp = otp.new_totp_from_key(otp_seed, OTP_DIGITS, OTP_INTERVAL) local token = string.match(password, "(%d+) ") local otp_value = token:sub(1,8) local nonce = token:sub(9) local signature = base64.decode(string.match(password, " (.+)")) local jid = username.."@"..module.host if totp:verify(otp_value, OTP_DEVIATION, luatz.time()) then log("debug", "The TOTP was verified"); local hmac_ctx = hmac.new(token_secret, DIGEST_TYPE) if signature == hmac_ctx:final(otp_value..nonce..jid) then log("debug", "The key was verified"); if check_nonce(jid, otp_value, nonce) then log("debug", "The nonce was verified"); return true; end end end log("debug", "Verification failed"); return false; end return { OTP_DEVIATION = OTP_DIGITS, OTP_DIGITS = OTP_DIGITS, OTP_INTERVAL = OTP_INTERVAL, DIGEST_TYPE = DIGEST_TYPE, verify_token = verify_token; }