Mercurial > prosody-modules

annotate mod_auth_token/token_auth_utils.lib.lua @ 4688:05725276fac0

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mod_bookmarks2: Use same default as mod_pep for max_items Should fix the issue with max items until the proper "max" can be used, by following the configured max. While "max" is already in trunk, it's not easily usable in 0.11.x This limit and option was added to mod_pep in Prosody rev aefb96a52f5f
author Kim Alvefur <zash@zash.se>
date Wed, 15 Sep 2021 17:39:37 +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 }