prosody-modules
f0ffa8cf3ce6
mod_external_services/mod_external_services.lua

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mod_external_services/mod_external_services.lua @ 4665:f0ffa8cf3ce6

mod_external_services: Validate required attributes on credentials requests
author Kim Alvefur <zash@zash.se>
date Sun, 29 Aug 2021 23:26:19 +0200
parent 4075:4841cf3fded5
child 4666:dbc7ba3cc27c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4075
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1
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2 local dt = require "util.datetime";
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3 local base64 = require "util.encodings".base64;
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4 local hashes = require "util.hashes";
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5 local st = require "util.stanza";
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6 local jid = require "util.jid";
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7 local array = require "util.array";
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8
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9 local default_host = module:get_option_string("external_service_host", module.host);
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10 local default_port = module:get_option_number("external_service_port");
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11 local default_secret = module:get_option_string("external_service_secret");
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12 local default_ttl = module:get_option_number("external_service_ttl", 86400);
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13
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14 local configured_services = module:get_option_array("external_services", {});
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15
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16 local access = module:get_option_set("external_service_access", {});
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17
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18 -- https://tools.ietf.org/html/draft-uberti-behave-turn-rest-00
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19 local function behave_turn_rest_credentials(srv, item, secret)
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20 local ttl = default_ttl;
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21 if type(item.ttl) == "number" then
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22 ttl = item.ttl;
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23 end
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24 local expires = srv.expires or os.time() + ttl;
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25 local username;
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26 if type(item.username) == "string" then
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27 username = string.format("%d:%s", expires, item.username);
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28 else
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29 username = string.format("%d", expires);
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30 end
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31 srv.username = username;
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32 srv.password = base64.encode(hashes.hmac_sha1(secret, srv.username));
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33 end
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34
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35 local algorithms = {
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36 turn = behave_turn_rest_credentials;
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37 }
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38
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39 -- filter config into well-defined service records
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40 local function prepare(item)
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41 if type(item) ~= "table" then
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42 module:log("error", "Service definition is not a table: %q", item);
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43 return nil;
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44 end
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45
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46 local srv = {
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47 type = nil;
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48 transport = nil;
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49 host = default_host;
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50 port = default_port;
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51 username = nil;
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52 password = nil;
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53 restricted = nil;
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54 expires = nil;
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55 };
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56
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57 if type(item.type) == "string" then
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58 srv.type = item.type;
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59 else
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60 module:log("error", "Service missing mandatory 'type' field: %q", item);
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61 return nil;
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62 end
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63 if type(item.transport) == "string" then
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64 srv.transport = item.transport;
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65 end
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66 if type(item.host) == "string" then
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67 srv.host = item.host;
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68 end
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69 if type(item.port) == "number" then
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70 srv.port = item.port;
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71 end
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72 if type(item.username) == "string" then
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73 srv.username = item.username;
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74 end
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75 if type(item.password) == "string" then
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76 srv.password = item.password;
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77 srv.restricted = true;
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78 end
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79 if item.restricted == true then
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80 srv.restricted = true;
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81 end
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82 if type(item.expires) == "number" then
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83 srv.expires = item.expires;
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84 elseif type(item.ttl) == "number" then
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85 srv.expires = os.time() + item.ttl;
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86 end
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87 if (item.secret == true and default_secret) or type(item.secret) == "string" then
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88 local secret_cb = item.credentials_cb or algorithms[item.algorithm] or algorithms[srv.type];
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89 local secret = item.secret;
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90 if secret == true then
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91 secret = default_secret;
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92 end
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93 if secret_cb then
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94 secret_cb(srv, item, secret);
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95 srv.restricted = true;
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96 end
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97 end
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98 return srv;
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99 end
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100
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101 function module.load()
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102 -- Trigger errors on startup
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103 local services = configured_services / prepare;
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104 if #services == 0 then
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105 module:log("warn", "No services configured or all had errors");
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106 end
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107 end
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108
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109 -- Ensure only valid items are added in events
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110 local services_mt = {
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111 __index = getmetatable(array()).__index;
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112 __newindex = function (self, i, v)
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113 rawset(self, i, assert(prepare(v), "Invalid service entry added"));
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114 end;
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115 }
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116
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117 local function handle_services(event)
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118 local origin, stanza = event.origin, event.stanza;
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119 local action = stanza.tags[1];
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120
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121 local user_bare = jid.bare(stanza.attr.from);
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122 local user_host = jid.host(user_bare);
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123 if not ((access:empty() and origin.type == "c2s") or access:contains(user_bare) or access:contains(user_host)) then
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124 origin.send(st.error_reply(stanza, "auth", "forbidden"));
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125 return true;
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126 end
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127
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128 local reply = st.reply(stanza):tag("services", { xmlns = action.attr.xmlns });
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129 local extras = module:get_host_items("external_service");
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130 local services = ( configured_services + extras ) / prepare;
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131
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132 local requested_type = action.attr.type;
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133 if requested_type then
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134 services:filter(function(item)
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parents:
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135 return item.type == requested_type;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
136 end);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
137 end
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
138
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
139 setmetatable(services, services_mt);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
140
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
141 module:fire_event("external_service/services", {
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
142 origin = origin;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
143 stanza = stanza;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
144 reply = reply;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
145 requested_type = requested_type;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
146 services = services;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
147 });
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
148
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
149 for _, srv in ipairs(services) do
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
150 reply:tag("service", {
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
151 type = srv.type;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
152 transport = srv.transport;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
153 host = srv.host;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
154 port = srv.port and string.format("%d", srv.port) or nil;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
155 username = srv.username;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
156 password = srv.password;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
157 expires = srv.expires and dt.datetime(srv.expires) or nil;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
158 restricted = srv.restricted and "1" or nil;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
159 }):up();
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
160 end
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
161
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
162 origin.send(reply);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
163 return true;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
164 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
165
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
166 local function handle_credentials(event)
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
167 local origin, stanza = event.origin, event.stanza;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
168 local action = stanza.tags[1];
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
169
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
170 if origin.type ~= "c2s" then
4665
f0ffa8cf3ce6 mod_external_services: Validate required attributes on credentials requests
Kim Alvefur <zash@zash.se>
parents: 4075
diff changeset
171 origin.send(st.error_reply(stanza, "auth", "forbidden", "The 'port' and 'type' attributes are required."));
4075
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
172 return true;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
173 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
174
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
175 local reply = st.reply(stanza):tag("credentials", { xmlns = action.attr.xmlns });
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
176 local extras = module:get_host_items("external_service");
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
177 local services = ( configured_services + extras ) / prepare;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
178 services:filter(function (item)
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
179 return item.restricted;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
180 end)
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
181
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
182 local requested_credentials = {};
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
183 for service in action:childtags("service") do
4665
f0ffa8cf3ce6 mod_external_services: Validate required attributes on credentials requests
Kim Alvefur <zash@zash.se>
parents: 4075
diff changeset
184 if not service.attr.type or not service.attr.host then
f0ffa8cf3ce6 mod_external_services: Validate required attributes on credentials requests
Kim Alvefur <zash@zash.se>
parents: 4075
diff changeset
185 origin.send(st.error_reply(stanza, "modify", "bad-request"));
f0ffa8cf3ce6 mod_external_services: Validate required attributes on credentials requests
Kim Alvefur <zash@zash.se>
parents: 4075
diff changeset
186 return true;
f0ffa8cf3ce6 mod_external_services: Validate required attributes on credentials requests
Kim Alvefur <zash@zash.se>
parents: 4075
diff changeset
187 end
f0ffa8cf3ce6 mod_external_services: Validate required attributes on credentials requests
Kim Alvefur <zash@zash.se>
parents: 4075
diff changeset
188
4075
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
189 table.insert(requested_credentials, {
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
190 type = service.attr.type;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
191 host = service.attr.host;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
192 port = tonumber(service.attr.port);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
193 });
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
194 end
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
195
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
196 setmetatable(services, services_mt);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
197 setmetatable(requested_credentials, services_mt);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
198
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
199 module:fire_event("external_service/credentials", {
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
200 origin = origin;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
201 stanza = stanza;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
202 reply = reply;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
203 requested_credentials = requested_credentials;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
204 services = services;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
205 });
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
206
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
207 for req_srv in action:childtags("service") do
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
208 for _, srv in ipairs(services) do
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
209 if srv.type == req_srv.attr.type and srv.host == req_srv.attr.host
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
210 and not req_srv.attr.port or srv.port == tonumber(req_srv.attr.port) then
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
211 reply:tag("service", {
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
212 type = srv.type;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
213 transport = srv.transport;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
214 host = srv.host;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
215 port = srv.port and string.format("%d", srv.port) or nil;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
216 username = srv.username;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
217 password = srv.password;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
218 expires = srv.expires and dt.datetime(srv.expires) or nil;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
219 restricted = srv.restricted and "1" or nil;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
220 }):up();
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
221 end
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
222 end
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
223 end
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
224
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
225 origin.send(reply);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
226 return true;
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
227 end
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
228
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
229 -- XEP-0215 v0.7
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
230 module:add_feature("urn:xmpp:extdisco:2");
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
231 module:hook("iq-get/host/urn:xmpp:extdisco:2:services", handle_services);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
232 module:hook("iq-get/host/urn:xmpp:extdisco:2:credentials", handle_credentials);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
233
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
234 -- COMPAT XEP-0215 v0.6
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
235 -- Those still on the old version gets to deal with undefined attributes until they upgrade.
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
236 module:add_feature("urn:xmpp:extdisco:1");
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
237 module:hook("iq-get/host/urn:xmpp:extdisco:1:services", handle_services);
4841cf3fded5 mod_external_service: Include for users of older versions of Prosody
Kim Alvefur <zash@zash.se>
parents:
diff changeset
238 module:hook("iq-get/host/urn:xmpp:extdisco:1:credentials", handle_credentials);