prosody-modules
b3e7886fea6a
mod_auth_oauth_external/mod_auth_oauth_external.lua

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mod_auth_oauth_external/mod_auth_oauth_external.lua @ 5435:b3e7886fea6a

mod_auth_oauth_external: Add setting for client_secret Whether this is needed may vary by OAuth provider. Mastodon for example requires it.
author Kim Alvefur <zash@zash.se>
date Mon, 08 May 2023 20:12:43 +0200
parent 5434:92ad8f03f225
child 5436:e7d99bacd0e8
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1 local http = require "net.http";
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2 local async = require "util.async";
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3 local jid = require "util.jid";
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4 local json = require "util.json";
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5 local sasl = require "util.sasl";
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6
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7 local issuer_identity = module:get_option_string("oauth_external_issuer");
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8 local oidc_discovery_url = module:get_option_string("oauth_external_discovery_url",
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9 issuer_identity and issuer_identity .. "/.well-known/oauth-authorization-server" or nil);
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10 local validation_endpoint = module:get_option_string("oauth_external_validation_endpoint");
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11 local token_endpoint = module:get_option_string("oauth_external_token_endpoint");
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12
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13 local username_field = module:get_option_string("oauth_external_username_field", "preferred_username");
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14 local allow_plain = module:get_option_boolean("oauth_external_resource_owner_password", true);
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15
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16 -- XXX Hold up, does whatever done here even need any of these things? Are we
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17 -- the OAuth client? Is the XMPP client the OAuth client? What are we???
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18 local client_id = module:get_option_string("oauth_external_client_id");
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19 local client_secret = module:get_option_string("oauth_external_client_secret");
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20
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21 --[[ More or less required endpoints
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22 digraph "oauth endpoints" {
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23 issuer -> discovery -> { registration validation }
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24 registration -> { client_id client_secret }
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25 { client_id client_secret validation } -> required
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26 }
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27 --]]
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28
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29 local host = module.host;
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30 local provider = {};
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31
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32 function provider.get_sasl_handler()
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33 local profile = {};
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34 profile.http_client = http.default; -- TODO configurable
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35 local extra = { oidc_discovery_url = oidc_discovery_url };
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36 if token_endpoint and allow_plain then
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37 local map_username = function (username, _realm) return username; end; --jid.join; -- TODO configurable
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38 function profile:plain_test(username, password, realm)
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39 local tok, err = async.wait_for(self.profile.http_client:request(token_endpoint, {
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40 headers = { ["Content-Type"] = "application/x-www-form-urlencoded; charset=utf-8"; ["Accept"] = "application/json" };
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41 body = http.formencode({
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42 grant_type = "password";
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43 client_id = client_id;
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44 client_secret = client_secret;
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45 username = map_username(username, realm);
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46 password = password;
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47 scope = "openid";
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48 });
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49 }))
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50 if err or not (tok.code >= 200 and tok.code < 300) then
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51 return false, nil;
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52 end
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53 local token_resp = json.decode(tok.body);
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54 if not token_resp or string.lower(token_resp.token_type or "") ~= "bearer" then
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55 return false, nil;
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56 end
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57 if not validation_endpoint then
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58 -- We're not going to get more info, only the username
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59 self.username = jid.escape(username);
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60 self.token_info = token_resp;
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61 return true, true;
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62 end
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63 local ret, err = async.wait_for(self.profile.http_client:request(validation_endpoint,
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64 { headers = { ["Authorization"] = "Bearer " .. token_resp.access_token; ["Accept"] = "application/json" } }));
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65 if err then
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66 return false, nil;
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67 end
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68 if not (ret.code >= 200 and ret.code < 300) then
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69 return false, nil;
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70 end
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71 local response = json.decode(ret.body);
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72 if type(response) ~= "table" or (response[username_field]) ~= username then
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73 return false, nil, nil;
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74 end
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75 if response.jid then
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76 self.username, self.realm, self.resource = jid.prepped_split(response.jid, true);
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77 end
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78 self.role = response.role;
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79 self.token_info = response;
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80 return true, true;
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81 end
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82 end
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83 if validation_endpoint then
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84 function profile:oauthbearer(token)
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85 if token == "" then
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86 return false, nil, extra;
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87 end
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88
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89 local ret, err = async.wait_for(self.profile.http_client:request(validation_endpoint, {
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90 headers = { ["Authorization"] = "Bearer " .. token; ["Accept"] = "application/json" };
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91 }));
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92 if err then
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93 return false, nil, extra;
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94 end
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95 local response = ret and json.decode(ret.body);
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96 if not (ret.code >= 200 and ret.code < 300) then
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97 return false, nil, response or extra;
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98 end
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99 if type(response) ~= "table" or type(response[username_field]) ~= "string" then
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100 return false, nil, nil;
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101 end
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102
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103 return response[username_field], true, response;
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104 end
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105 end
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106 return sasl.new(host, profile);
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107 end
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108
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109 module:provides("auth", provider);