Mercurial > prosody-modules
view mod_auth_token/token_auth_utils.lib.lua @ 3568:6b3181fe5617
mod_auth_token: Timezone fix for TOTP checking
luatz.time() returns milliseconds since epoch which is in UTC time, so we don't
need to convert to UTC with gmtime.
By calling gmtime, TOTP validation was failing when this module wasn't running
on machine set to UTC time.
author | JC Brand <jc@opkode.com> |
---|---|
date | Thu, 02 May 2019 11:07:27 +0200 |
parents | ac1f63cdb6d6 |
children | 0fb12a4b6106 |
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local base64 = require "util.encodings".base64; local digest = require "openssl.digest"; 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 = {}; function check_nonce(jid, otp, 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] == nil then nonce_cache[jid] = {} nonce_cache[jid][otp] = {} nonce_cache[jid][otp][nonce] = true return true; end if nonce_cache[jid][otp][nonce] == true then return false; else nonce_cache[jid][otp][nonce] = true; return true; end end function verify_token(username, password, realm, otp_seed, token_secret, log) if (realm ~= module.host) then log("debug", "Verification failed: realm ~= module.host"); return false; end local totp = otp.new_totp_from_key(otp_seed, OTP_DIGITS, OTP_INTERVAL) local token = string.match(password, "(%d+) ") local otp = token:sub(1,8) local nonce = token:sub(9) local signature = base64.decode(string.match(password, " (.+)")) local jid = username.."@"..realm if totp:verify(otp, 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..nonce..jid) then log("debug", "The key was verified"); if check_nonce(jid, otp, 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; }