prosody-modules
06640647d193
mod_auth_oauth_external/mod_auth_oauth_external.lua

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mod_auth_oauth_external/mod_auth_oauth_external.lua @ 5461:06640647d193

mod_http_oauth2: Fix use of arbitrary ports in loopback redirect URIs Per draft-ietf-oauth-v2-1-08#section-8.4.2 > The authorization server MUST allow any port to be specified at the > time of the request for loopback IP redirect URIs, to accommodate > clients that obtain an available ephemeral port from the operating > system at the time of the request. Uncertain if it should normalize the host part, but it also seems harmless to treat IPv6 and IPv4 the same here. One thing is that "localhost" is NOT RECOMMENDED because it can sometimes be pointed to non-loopback interfaces via DNS or hosts file.
author Kim Alvefur <zash@zash.se>
date Wed, 17 May 2023 13:51:30 +0200
parent 5443:4e79f344ae2f
child 5724:0207fd248480
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
0a6d2b79a8bf mod_auth_oauth_external: Authenticate against an OAuth 2 provider
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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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131 end
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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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135
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136 module:provides("auth", provider);