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annotate mod_auth_oauthbearer/mod_auth_oauthbearer.lua @ 3114:73ada978dabc

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mod_sasl_oauthbearer and mod_auth_oauthbearer Two new modules for logging in with OAuth tokens.
author JC Brand <jc@opkode.com>
date Wed, 13 Jun 2018 17:09:49 +0000
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children d2bf9c8be3a3
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1 local host = module.host;
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2 local log = module._log;
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3 local new_sasl = require "util.sasl".new;
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4 local base64 = require "util.encodings".base64.encode;
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5
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6 local provider = {};
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7
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8 local oauth_client_id = module:get_option_string("oauth_client_id", "");
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9 local oauth_client_secret = module:get_option_string("oauth_client_secret", "");
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10 local oauth_url = module:get_option_string("oauth_url", "");
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11
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12 if oauth_client_id == "" then error("oauth_client_id required") end
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13 if oauth_client_secret == "" then error("oauth_client_secret required") end
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14 if oauth_url == "" then error("oauth_url required") end
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15
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16 -- globals required by socket.http
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17 if rawget(_G, "PROXY") == nil then
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18 rawset(_G, "PROXY", false)
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19 end
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20 if rawget(_G, "base_parsed") == nil then
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21 rawset(_G, "base_parsed", false)
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22 end
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23
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24 local function interp(s, tab)
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25 -- String interpolation, so that we can make the oauth_url configurable
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26 -- e.g. oauth_url = "https://api.github.com/applications/{{oauth_client_id}}/tokens/{{password}}";
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27 --
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28 -- See: http://lua-users.org/wiki/StringInterpolation
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29 return (s:gsub('(%b{})', function(w) return tab[w:sub(3, -3)] or w end))
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30 end
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31
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32 function provider.test_password(sasl, username, password, realm)
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33 log("debug", "Testing signed OAuth2 for user %s at realm %s", username, realm);
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34 -- TODO: determine, based on the "realm" which OAuth provider to verify with.
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35 module:log("debug", "sync_http_auth()");
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36 local https = require "ssl.https";
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37 local url = interp(oauth_url, {oauth_client_id = oauth_client_id, password = password});
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38
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39 module:log("debug", "The URL is: "..url);
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40 local _, code, headers, status = https.request{
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41 url = url,
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42 headers = {
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43 Authorization = "Basic "..base64(oauth_client_id..":"..oauth_client_secret);
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44 }
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45 };
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46 if type(code) == "number" and code >= 200 and code <= 299 then
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47 module:log("debug", "OAuth provider confirmed valid password");
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48 return 'johnny', true;
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49 else
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50 module:log("warn", "OAuth provider returned status code: "..code);
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51 end
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52 module:log("warn", "OAuth failed. Invalid username or password.");
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53 return nil, false;
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54 end
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55
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56 function provider.users()
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57 return function()
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58 return nil;
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59 end
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60 end
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61
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62 function provider.set_password(username, password)
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63 return nil, "Changing passwords not supported";
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64 end
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65
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66 function provider.user_exists(username)
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67 return true;
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68 end
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69
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70 function provider.create_user(username, password)
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71 return nil, "User creation not supported";
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72 end
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73
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74 function provider.delete_user(username)
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75 return nil , "User deletion not supported";
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76 end
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77
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78 function provider.get_sasl_handler()
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79 local supported_mechanisms = {};
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80 supported_mechanisms["OAUTHBEARER"] = true;
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81
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82 return new_sasl(host, {
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83 oauthbearer = function(sasl, username, password, realm)
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84 return provider.test_password(sasl, username, password, realm);
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85 end,
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86 mechanisms = supported_mechanisms
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87 });
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88 end
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89
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90 module:provides("auth", provider);