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annotate mod_auth_oauth_external/mod_auth_oauth_external.lua @ 5345:3390bb2f9f6c

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mod_auth_oauth_external: Support PLAIN via resource owner password grant Might not be supported by the backend but PLAIN is the lowest common denominator, so not having it would lock out a lot of clients.
author Kim Alvefur <zash@zash.se>
date Thu, 16 Mar 2023 12:45:52 +0100
parents 0a6d2b79a8bf
children d9bc8712a745
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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 json = require "util.json";
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4 local sasl = require "util.sasl";
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5
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6 -- TODO -- local issuer_identity = module:get_option_string("oauth_external_issuer");
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7 local oidc_discovery_url = module:get_option_string("oauth_external_discovery_url")
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8 local validation_endpoint = module:get_option_string("oauth_external_validation_endpoint");
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9 local token_endpoint = module:get_option_string("oauth_external_token_endpoint");
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10
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11 local username_field = module:get_option_string("oauth_external_username_field", "preferred_username");
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12 local allow_plain = module:get_option_boolean("oauth_external_resource_owner_password", true);
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13
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14 -- XXX Hold up, does whatever done here even need any of these things? Are we
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15 -- the OAuth client? Is the XMPP client the OAuth client? What are we???
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16 local client_id = module:get_option_string("oauth_external_client_id");
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17 -- TODO -- local client_secret = module:get_option_string("oauth_external_client_secret");
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18
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19 --[[ More or less required endpoints
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20 digraph "oauth endpoints" {
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21 issuer -> discovery -> { registration validation }
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22 registration -> { client_id client_secret }
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23 { client_id client_secret validation } -> required
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24 }
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25 --]]
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26
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27 local host = module.host;
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28 local provider = {};
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29
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30 function provider.get_sasl_handler()
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31 local profile = {};
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32 profile.http_client = http.default; -- TODO configurable
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33 local extra = { oidc_discovery_url = oidc_discovery_url };
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34 if token_endpoint and allow_plain then
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35 local map_username = function (username, _realm) return username; end; --jid.join; -- TODO configurable
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36 function profile:plain_test(username, password, realm)
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37 local tok, err = async.wait_for(self.profile.http_client:request(token_endpoint, {
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38 headers = { ["Content-Type"] = "application/x-www-form-urlencoded; charset=utf-8"; ["Accept"] = "application/json" };
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39 body = http.formencode({
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40 grant_type = "password";
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41 client_id = client_id;
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42 username = map_username(username, realm);
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43 password = password;
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44 scope = "openid";
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45 });
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46 }))
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47 if err or not (tok.code >= 200 and tok.code < 300) then
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48 return false, nil;
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49 end
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50 local token_resp = json.decode(tok.body);
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51 if not token_resp or string.lower(token_resp.token_type or "") ~= "bearer" then
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52 return false, nil;
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53 end
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54 local ret, err = async.wait_for(self.profile.http_client:request(validation_endpoint,
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55 { headers = { ["Authorization"] = "Bearer " .. token_resp.access_token; ["Accept"] = "application/json" } }));
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56 if err then
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57 return false, nil;
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58 end
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59 if not (ret.code >= 200 and ret.code < 300) then
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60 return false, nil;
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61 end
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62 local response = json.decode(ret.body);
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63 if type(response) ~= "table" or (response[username_field]) ~= username then
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64 return false, nil, nil;
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65 end
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66 if response.jid then
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67 self.username, self.realm, self.resource = jid.prepped_split(response.jid, true);
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68 end
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69 self.role = response.role;
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70 self.token_info = response;
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71 return true, true;
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72 end
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73 end
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74 function profile:oauthbearer(token)
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75 if token == "" then
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76 return false, nil, extra;
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77 end
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78
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79 local ret, err = async.wait_for(self.profile.http_client:request(validation_endpoint,
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80 { headers = { ["Authorization"] = "Bearer " .. token; ["Accept"] = "application/json" } }));
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81 if err then
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82 return false, nil, extra;
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83 end
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84 local response = ret and json.decode(ret.body);
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85 if not (ret.code >= 200 and ret.code < 300) then
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86 return false, nil, response or extra;
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87 end
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88 if type(response) ~= "table" or type(response[username_field]) ~= "string" then
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89 return false, nil, nil;
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90 end
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91
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92 return response[username_field], true, response;
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93 end
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94 return sasl.new(host, profile);
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95 end
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96
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97 module:provides("auth", provider);