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annotate mod_auth_oauth_external/mod_auth_oauth_external.lua @ 5502:fd4d89a5b8db

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mod_http_oauth2: Add provisions for dynamically adding simple scopes This lets additional modules define what scopes they might add to the userinfo endpoint, or other things.
author Kim Alvefur <zash@zash.se>
date Thu, 01 Jun 2023 18:16:13 +0200
parents 4e79f344ae2f
children 0207fd248480
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 local scope = module:get_option_string("oauth_external_scope", "openid");
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21
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22 --[[ More or less required endpoints
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23 digraph "oauth endpoints" {
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24 issuer -> discovery -> { registration validation }
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25 registration -> { client_id client_secret }
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26 { client_id client_secret validation } -> required
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27 }
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28 --]]
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29
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30 local host = module.host;
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31 local provider = {};
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32
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33 local function not_implemented()
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34 return nil, "method not implemented"
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35 end
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36
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37 -- With proper OAuth 2, most of these should be handled at the atuhorization
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38 -- server, no there.
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39 provider.test_password = not_implemented;
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40 provider.get_password = not_implemented;
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41 provider.set_password = not_implemented;
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42 provider.create_user = not_implemented;
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43 provider.delete_user = not_implemented;
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44
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45 function provider.user_exists(_username)
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46 -- Can this even be done in a generic way in OAuth 2?
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47 -- OIDC and WebFinger perhaps?
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48 return true;
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49 end
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50
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51 function provider.users()
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52 -- TODO this could be done by recording known users locally
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53 return function ()
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54 module:log("debug", "User iteration not supported");
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55 return nil;
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56 end
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57 end
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58
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59 function provider.get_sasl_handler()
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60 local profile = {};
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61 profile.http_client = http.default; -- TODO configurable
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62 local extra = { oidc_discovery_url = oidc_discovery_url };
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63 if token_endpoint and allow_plain then
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64 local map_username = function (username, _realm) return username; end; --jid.join; -- TODO configurable
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65 function profile:plain_test(username, password, realm)
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66 username = jid.unescape(username); -- COMPAT Mastodon
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67 local tok, err = async.wait_for(self.profile.http_client:request(token_endpoint, {
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68 headers = { ["Content-Type"] = "application/x-www-form-urlencoded; charset=utf-8"; ["Accept"] = "application/json" };
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69 body = http.formencode({
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70 grant_type = "password";
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71 client_id = client_id;
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72 client_secret = client_secret;
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73 username = map_username(username, realm);
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74 password = password;
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75 scope = scope;
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76 });
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77 }))
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78 if err or not (tok.code >= 200 and tok.code < 300) then
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79 return false, nil;
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80 end
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81 local token_resp = json.decode(tok.body);
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82 if not token_resp or string.lower(token_resp.token_type or "") ~= "bearer" then
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83 return false, nil;
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84 end
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85 if not validation_endpoint then
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86 -- We're not going to get more info, only the username
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87 self.username = jid.escape(username);
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88 self.token_info = token_resp;
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89 return true, true;
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90 end
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91 local ret, err = async.wait_for(self.profile.http_client:request(validation_endpoint,
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92 { headers = { ["Authorization"] = "Bearer " .. token_resp.access_token; ["Accept"] = "application/json" } }));
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93 if err then
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94 return false, nil;
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95 end
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96 if not (ret.code >= 200 and ret.code < 300) then
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97 return false, nil;
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98 end
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99 local response = json.decode(ret.body);
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100 if type(response) ~= "table" then
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101 return false, nil, nil;
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102 elseif type(response[username_field]) ~= "string" then
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103 return false, nil, nil;
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104 end
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105 self.username = jid.escape(response[username_field]);
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106 self.token_info = response;
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107 return true, true;
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108 end
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109 end
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110 if validation_endpoint then
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111 function profile:oauthbearer(token)
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112 if token == "" then
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113 return false, nil, extra;
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114 end
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115
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116 local ret, err = async.wait_for(self.profile.http_client:request(validation_endpoint, {
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117 headers = { ["Authorization"] = "Bearer " .. token; ["Accept"] = "application/json" };
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118 }));
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119 if err then
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120 return false, nil, extra;
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121 end
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122 local response = ret and json.decode(ret.body);
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123 if not (ret.code >= 200 and ret.code < 300) then
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124 return false, nil, response or extra;
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125 end
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126 if type(response) ~= "table" or type(response[username_field]) ~= "string" then
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127 return false, nil, nil;
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128 end
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129
5443
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130 return jid.escape(response[username_field]), true, response;
5344
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parents:
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131 end
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parents:
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132 end
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133 return sasl.new(host, profile);
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134 end
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parents:
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135
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parents:
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136 module:provides("auth", provider);