Mercurial > prosody-modules
annotate mod_auth_token/token_auth_utils.lib.lua @ 3598:1921ae4449b8
mod_conversejs: Separate out templates into separate configurable files (breaks 0.9 compat)
author | Kim Alvefur <zash@zash.se> |
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date | Thu, 16 May 2019 08:45:41 +0200 |
parents | 6b3181fe5617 |
children | 0fb12a4b6106 |
rev | line source |
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1 local base64 = require "util.encodings".base64; |
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2 local digest = require "openssl.digest"; |
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3 local hmac = require "openssl.hmac"; |
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4 local luatz = require "luatz"; |
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5 local otp = require "otp"; |
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6 |
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7 local DIGEST_TYPE = "SHA256"; |
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8 local OTP_DEVIATION = 1; |
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9 local OTP_DIGITS = 8; |
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10 local OTP_INTERVAL = 30; |
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11 |
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12 local nonce_cache = {}; |
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13 |
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14 function check_nonce(jid, otp, nonce) |
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15 -- We cache all nonces used per OTP, to ensure that a token cannot be used |
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16 -- more than once. |
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17 -- |
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18 -- We assume that the OTP is valid in the current time window. This is the |
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19 -- case because we only call check_nonce *after* the OTP has been verified. |
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20 -- |
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21 -- We only store one OTP per JID, so if a new OTP comes in, we wipe the |
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22 -- previous OTP and its cached nonces. |
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23 if nonce_cache[jid] == nil or nonce_cache[jid][otp] == nil then |
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24 nonce_cache[jid] = {} |
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25 nonce_cache[jid][otp] = {} |
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26 nonce_cache[jid][otp][nonce] = true |
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27 return true; |
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28 end |
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29 if nonce_cache[jid][otp][nonce] == true then |
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30 return false; |
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31 else |
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32 nonce_cache[jid][otp][nonce] = true; |
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33 return true; |
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34 end |
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35 end |
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36 |
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37 |
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38 function verify_token(username, password, realm, otp_seed, token_secret, log) |
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39 if (realm ~= module.host) then |
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40 log("debug", "Verification failed: realm ~= module.host"); |
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41 return false; |
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42 end |
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43 |
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44 local totp = otp.new_totp_from_key(otp_seed, OTP_DIGITS, OTP_INTERVAL) |
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45 local token = string.match(password, "(%d+) ") |
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46 local otp = token:sub(1,8) |
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47 local nonce = token:sub(9) |
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48 local signature = base64.decode(string.match(password, " (.+)")) |
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49 local jid = username.."@"..realm |
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50 |
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51 if totp:verify(otp, OTP_DEVIATION, luatz.time()) then |
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52 log("debug", "The TOTP was verified"); |
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53 local hmac_ctx = hmac.new(token_secret, DIGEST_TYPE) |
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54 if signature == hmac_ctx:final(otp..nonce..jid) then |
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55 log("debug", "The key was verified"); |
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56 if check_nonce(jid, otp, nonce) then |
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57 log("debug", "The nonce was verified"); |
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58 return true; |
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59 end |
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60 end |
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61 end |
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62 log("debug", "Verification failed"); |
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63 return false; |
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64 end |
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65 |
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66 return { |
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67 OTP_DEVIATION = OTP_DIGITS, |
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68 OTP_DIGITS = OTP_DIGITS, |
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69 OTP_INTERVAL = OTP_INTERVAL, |
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70 DIGEST_TYPE = DIGEST_TYPE, |
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71 verify_token = verify_token; |
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72 } |