prosody-modules
a0937b5cfdcb
mod_auth_token/token_auth_utils.lib.lua

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mod_auth_token/token_auth_utils.lib.lua @ 4210:a0937b5cfdcb

mod_invites_page: Remove preauth URI button This button is incompatible with the majority of XMPP clients around, yet based on feedback from users, many are drawn to click it when they have any XMPP client installed already. In the case where the user already has software installed, we would prefer them to select it from the software list so they can follow the setup process suited to their specific client (we already track which software supports preauth URIs). If their client is not listed, they can still use the manual registration link instead.
author Matthew Wild <mwild1@gmail.com>
date Fri, 16 Oct 2020 11:03:38 +0100
parent 3693:0fb12a4b6106
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rev   line source
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1 local base64 = require "util.encodings".base64;
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2 local hmac = require "openssl.hmac";
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3 local luatz = require "luatz";
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4 local otp = require "otp";
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5
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6 local DIGEST_TYPE = "SHA256";
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7 local OTP_DEVIATION = 1;
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8 local OTP_DIGITS = 8;
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9 local OTP_INTERVAL = 30;
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10
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11 local nonce_cache = {};
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12
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13 local function check_nonce(jid, otp_value, nonce)
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14 -- We cache all nonces used per OTP, to ensure that a token cannot be used
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15 -- more than once.
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16 --
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17 -- We assume that the OTP is valid in the current time window. This is the
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18 -- case because we only call check_nonce *after* the OTP has been verified.
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19 --
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20 -- We only store one OTP per JID, so if a new OTP comes in, we wipe the
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21 -- previous OTP and its cached nonces.
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22 if nonce_cache[jid] == nil or nonce_cache[jid][otp_value] == nil then
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23 nonce_cache[jid] = {}
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24 nonce_cache[jid][otp_value] = {}
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25 nonce_cache[jid][otp_value][nonce] = true
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26 return true;
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27 end
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28 if nonce_cache[jid][otp_value][nonce] == true then
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29 return false;
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30 else
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31 nonce_cache[jid][otp_value][nonce] = true;
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32 return true;
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33 end
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34 end
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35
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36
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37 local function verify_token(username, password, otp_seed, token_secret, log)
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38 local totp = otp.new_totp_from_key(otp_seed, OTP_DIGITS, OTP_INTERVAL)
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39 local token = string.match(password, "(%d+) ")
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40 local otp_value = token:sub(1,8)
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41 local nonce = token:sub(9)
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42 local signature = base64.decode(string.match(password, " (.+)"))
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43 local jid = username.."@"..module.host
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44
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45 if totp:verify(otp_value, OTP_DEVIATION, luatz.time()) then
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46 log("debug", "The TOTP was verified");
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47 local hmac_ctx = hmac.new(token_secret, DIGEST_TYPE)
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48 if signature == hmac_ctx:final(otp_value..nonce..jid) then
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49 log("debug", "The key was verified");
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50 if check_nonce(jid, otp_value, nonce) then
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51 log("debug", "The nonce was verified");
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52 return true;
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53 end
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54 end
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55 end
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56 log("debug", "Verification failed");
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57 return false;
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58 end
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59
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60 return {
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61 OTP_DEVIATION = OTP_DIGITS,
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62 OTP_DIGITS = OTP_DIGITS,
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63 OTP_INTERVAL = OTP_INTERVAL,
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64 DIGEST_TYPE = DIGEST_TYPE,
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65 verify_token = verify_token;
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66 }