Mercurial > prosody-modules

annotate mod_auth_token/token_auth_utils.lib.lua @ 5416:2393dbae51ed

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mod_http_oauth2: Add option for specifying TTL of registered clients Meant to simplify configuration, since TTL vs ignoring expiration is expected to be the main thing one would want to configure. Unsure what the implications of having unlimited lifetime of clients are, given no way to revoke them currently, short of rotating the signing secret. On one hand, it would be annoying to have the client expire. On the other hand, it is trivial to re-register it.
author Kim Alvefur <zash@zash.se>
date Thu, 04 May 2023 18:41:33 +0200
parents 0fb12a4b6106
children
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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 }