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1 -- Prosody IM |
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2 -- Copyright (C) 2008-2010 Matthew Wild |
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3 -- Copyright (C) 2008-2010 Waqas Hussain |
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4 -- |
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5 -- This project is MIT/X11 licensed. Please see the |
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6 -- COPYING file in the source package for more information. |
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7 -- |
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8 |
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9 module:set_global(); |
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10 |
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11 local prosody = prosody; |
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12 local hosts = prosody.hosts; |
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13 local core_process_stanza = prosody.core_process_stanza; |
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14 |
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15 local tostring, type = tostring, type; |
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16 local t_insert = table.insert; |
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17 local traceback = debug.traceback; |
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18 |
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19 local add_task = require "util.timer".add_task; |
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20 local st = require "util.stanza"; |
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21 local initialize_filters = require "util.filters".initialize; |
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22 local nameprep = require "util.encodings".stringprep.nameprep; |
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23 local new_xmpp_stream = require "util.xmppstream".new; |
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24 local s2s_new_incoming = require "core.s2smanager".new_incoming; |
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25 local s2s_new_outgoing = require "core.s2smanager".new_outgoing; |
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26 local s2s_destroy_session = require "core.s2smanager".destroy_session; |
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27 local uuid_gen = require "util.uuid".generate; |
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28 local fire_global_event = prosody.events.fire_event; |
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29 local runner = require "util.async".runner; |
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30 local connect = require "net.connect".connect; |
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31 local service = require "net.resolvers.service"; |
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32 local errors = require "util.error"; |
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33 local set = require "util.set"; |
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34 |
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35 local connect_timeout = module:get_option_number("s2s_timeout", 90); |
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36 local stream_close_timeout = module:get_option_number("s2s_close_timeout", 5); |
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37 local opt_keepalives = module:get_option_boolean("s2s_tcp_keepalives", module:get_option_boolean("tcp_keepalives", true)); |
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38 local secure_auth = module:get_option_boolean("s2s_secure_auth", false); -- One day... |
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39 local secure_domains, insecure_domains = |
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40 module:get_option_set("s2s_secure_domains", {})._items, module:get_option_set("s2s_insecure_domains", {})._items; |
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41 local require_encryption = module:get_option_boolean("s2s_require_encryption", false); |
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42 local stanza_size_limit = module:get_option_number("s2s_stanza_size_limit"); -- TODO come up with a sensible default (util.xmppstream defaults to 10M) |
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43 |
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44 local measure_connections = module:measure("connections", "amount"); |
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45 local measure_ipv6 = module:measure("ipv6", "amount"); |
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46 |
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47 local sessions = module:shared("sessions"); |
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48 |
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49 local runner_callbacks = {}; |
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50 |
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51 local listener = {}; |
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52 |
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53 local log = module._log; |
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54 |
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55 local s2s_service_options = { |
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56 default_port = 5269; |
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57 use_ipv4 = module:get_option_boolean("use_ipv4", true); |
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58 use_ipv6 = module:get_option_boolean("use_ipv6", true); |
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59 }; |
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60 |
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61 module:hook("stats-update", function () |
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62 local count = 0; |
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63 local ipv6 = 0; |
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64 for _, session in pairs(sessions) do |
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65 count = count + 1; |
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66 if session.ip and session.ip:match(":") then |
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67 ipv6 = ipv6 + 1; |
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68 end |
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69 end |
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70 measure_connections(count); |
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71 measure_ipv6(ipv6); |
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72 end); |
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73 |
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74 --- Handle stanzas to remote domains |
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75 |
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76 local bouncy_stanzas = { message = true, presence = true, iq = true }; |
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77 local function bounce_sendq(session, reason) |
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78 local sendq = session.sendq; |
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79 if not sendq then return; end |
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80 session.log("info", "Sending error replies for %d queued stanzas because of failed outgoing connection to %s", #sendq, session.to_host); |
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81 local dummy = { |
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82 type = "s2sin"; |
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83 send = function () |
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84 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", traceback()); |
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85 end; |
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86 dummy = true; |
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87 close = function () |
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88 (session.log or log)("error", "Attempting to close the dummy origin of s2s error replies, please report this! Traceback: %s", traceback()); |
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89 end; |
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90 }; |
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91 -- FIXME Allow for more specific error conditions |
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92 -- TODO use util.error ? |
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93 local error_type = "cancel"; |
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94 local condition = "remote-server-not-found"; |
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95 local reason_text; |
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96 if session.had_stream then -- set when a stream is opened by the remote |
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97 error_type, condition = "wait", "remote-server-timeout"; |
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98 end |
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99 if errors.is_err(reason) then |
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100 error_type, condition, reason_text = reason.type, reason.condition, reason.text; |
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101 elseif type(reason) == "string" then |
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102 reason_text = reason; |
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103 end |
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104 for i, data in ipairs(sendq) do |
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105 local reply = data[2]; |
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106 if reply and not(reply.attr.xmlns) and bouncy_stanzas[reply.name] then |
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107 reply.attr.type = "error"; |
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108 reply:tag("error", {type = error_type, by = session.from_host}) |
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109 :tag(condition, {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up(); |
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110 if reason_text then |
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111 reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}) |
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112 :text("Server-to-server connection failed: "..reason_text):up(); |
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113 end |
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114 core_process_stanza(dummy, reply); |
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115 end |
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116 sendq[i] = nil; |
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117 end |
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118 session.sendq = nil; |
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119 end |
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120 |
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121 -- Handles stanzas to existing s2s sessions |
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122 function route_to_existing_session(event) |
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123 local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza; |
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124 if not hosts[from_host] then |
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125 log("warn", "Attempt to send stanza from %s - a host we don't serve", from_host); |
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126 return false; |
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127 end |
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128 if hosts[to_host] then |
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129 log("warn", "Attempt to route stanza to a remote %s - a host we do serve?!", from_host); |
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130 return false; |
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131 end |
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132 local host = hosts[from_host].s2sout[to_host]; |
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133 if not host then return end |
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134 |
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135 -- We have a connection to this host already |
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136 if host.type == "s2sout_unauthed" and (stanza.name ~= "db:verify" or not host.dialback_key) then |
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137 (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host); |
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138 |
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139 -- Queue stanza until we are able to send it |
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140 local queued_item = { |
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141 tostring(stanza), |
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142 stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza); |
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143 }; |
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144 if host.sendq then |
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145 t_insert(host.sendq, queued_item); |
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146 else |
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147 -- luacheck: ignore 122 |
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148 host.sendq = { queued_item }; |
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149 end |
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150 host.log("debug", "stanza [%s] queued ", stanza.name); |
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151 return true; |
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152 elseif host.type == "local" or host.type == "component" then |
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153 log("error", "Trying to send a stanza to ourselves??") |
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154 log("error", "Traceback: %s", traceback()); |
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155 log("error", "Stanza: %s", stanza); |
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156 return false; |
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157 else |
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158 if host.sends2s(stanza) then |
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159 return true; |
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160 end |
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161 end |
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162 end |
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163 |
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164 -- Create a new outgoing session for a stanza |
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165 function route_to_new_session(event) |
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166 local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza; |
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167 log("debug", "opening a new outgoing connection for this stanza"); |
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168 local host_session = s2s_new_outgoing(from_host, to_host); |
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169 host_session.version = 1; |
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170 |
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171 -- Store in buffer |
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172 host_session.bounce_sendq = bounce_sendq; |
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173 host_session.sendq = { {tostring(stanza), stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)} }; |
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174 log("debug", "stanza [%s] queued until connection complete", stanza.name); |
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175 connect(service.new(to_host, "xmpp-server", "tcp", s2s_service_options), listener, nil, { session = host_session }); |
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176 return true; |
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177 end |
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178 |
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179 local function keepalive(event) |
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180 return event.session.sends2s(' '); |
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181 end |
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182 |
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183 module:hook("s2s-read-timeout", keepalive, -1); |
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184 |
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185 function module.add_host(module) |
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186 if module:get_option_boolean("disallow_s2s", false) then |
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187 module:log("warn", "The 'disallow_s2s' config option is deprecated, please see https://prosody.im/doc/s2s#disabling"); |
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188 return nil, "This host has disallow_s2s set"; |
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189 end |
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190 module:hook("route/remote", route_to_existing_session, -1); |
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191 module:hook("route/remote", route_to_new_session, -10); |
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192 module:hook("s2s-authenticated", make_authenticated, -1); |
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193 module:hook("s2s-read-timeout", keepalive, -1); |
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194 module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza) -- luacheck: ignore 212/stanza |
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195 if session.type == "s2sout" then |
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196 -- Stream is authenticated and we are seem to be done with feature negotiation, |
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197 -- so the stream is ready for stanzas. RFC 6120 Section 4.3 |
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198 mark_connected(session); |
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199 return true; |
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200 elseif require_encryption and not session.secure then |
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201 session.log("warn", "Encrypted server-to-server communication is required but was not offered by %s", session.to_host); |
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202 session:close({ |
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203 condition = "policy-violation", |
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204 text = "Encrypted server-to-server communication is required but was not offered", |
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205 }, nil, "Could not establish encrypted connection to remote server"); |
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206 return true; |
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207 elseif not session.dialback_verifying then |
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208 session.log("warn", "No SASL EXTERNAL offer and Dialback doesn't seem to be enabled, giving up"); |
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209 session:close({ |
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210 condition = "unsupported-feature", |
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211 text = "No viable authentication method offered", |
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212 }, nil, "No viable authentication method offered by remote server"); |
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213 return true; |
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214 end |
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215 end, -1); |
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216 end |
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217 |
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218 -- Stream is authorised, and ready for normal stanzas |
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219 function mark_connected(session) |
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220 |
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221 local sendq = session.sendq; |
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222 |
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223 local from, to = session.from_host, session.to_host; |
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224 |
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225 session.log("info", "%s s2s connection %s->%s complete", session.direction:gsub("^.", string.upper), from, to); |
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226 |
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227 local event_data = { session = session }; |
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228 if session.type == "s2sout" then |
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229 fire_global_event("s2sout-established", event_data); |
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230 hosts[from].events.fire_event("s2sout-established", event_data); |
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231 |
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232 if session.incoming then |
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233 session.send = function(stanza) |
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234 return hosts[from].events.fire_event("route/remote", { from_host = from, to_host = to, stanza = stanza }); |
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235 end; |
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236 end |
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237 |
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238 else |
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239 if session.outgoing and not hosts[to].s2sout[from] then |
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240 session.log("debug", "Setting up to handle route from %s to %s", to, from); |
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241 hosts[to].s2sout[from] = session; -- luacheck: ignore 122 |
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242 end |
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243 local host_session = hosts[to]; |
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244 session.send = function(stanza) |
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245 return host_session.events.fire_event("route/remote", { from_host = to, to_host = from, stanza = stanza }); |
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246 end; |
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247 |
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248 fire_global_event("s2sin-established", event_data); |
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249 hosts[to].events.fire_event("s2sin-established", event_data); |
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250 end |
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251 |
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252 if session.direction == "outgoing" then |
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253 if sendq then |
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254 session.log("debug", "sending %d queued stanzas across new outgoing connection to %s", #sendq, session.to_host); |
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255 local send = session.sends2s; |
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256 for i, data in ipairs(sendq) do |
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257 send(data[1]); |
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258 sendq[i] = nil; |
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259 end |
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260 session.sendq = nil; |
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261 end |
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262 end |
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263 end |
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264 |
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265 function make_authenticated(event) |
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266 local session, host = event.session, event.host; |
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267 if not session.secure then |
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268 if require_encryption or (secure_auth and not(insecure_domains[host])) or secure_domains[host] then |
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269 session:close({ |
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270 condition = "policy-violation", |
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271 text = "Encrypted server-to-server communication is required but was not " |
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272 ..((session.direction == "outgoing" and "offered") or "used") |
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273 }, nil, "Could not establish encrypted connection to remote server"); |
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274 end |
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275 end |
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276 if hosts[host] then |
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277 session:close({ condition = "undefined-condition", text = "Attempt to authenticate as a host we serve" }); |
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278 end |
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279 if session.type == "s2sout_unauthed" then |
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280 session.type = "s2sout"; |
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281 elseif session.type == "s2sin_unauthed" then |
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282 session.type = "s2sin"; |
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283 elseif session.type ~= "s2sin" and session.type ~= "s2sout" then |
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284 return false; |
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285 end |
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286 |
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287 if session.incoming and host then |
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288 if not session.hosts[host] then session.hosts[host] = {}; end |
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289 session.hosts[host].authed = true; |
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290 end |
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291 session.log("debug", "connection %s->%s is now authenticated for %s", session.from_host, session.to_host, host); |
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292 |
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293 if (session.type == "s2sout" and session.external_auth ~= "succeeded") or session.type == "s2sin" then |
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294 -- Stream either used dialback for authentication or is an incoming stream. |
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295 mark_connected(session); |
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296 end |
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297 |
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298 return true; |
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299 end |
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300 |
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301 --- Helper to check that a session peer's certificate is valid |
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302 function check_cert_status(session) |
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303 local host = session.direction == "outgoing" and session.to_host or session.from_host |
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304 local conn = session.conn:socket() |
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305 local cert |
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306 if conn.getpeercertificate then |
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307 cert = conn:getpeercertificate() |
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308 end |
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309 |
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310 return module:fire_event("s2s-check-certificate", { host = host, session = session, cert = cert }); |
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311 end |
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312 |
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313 --- XMPP stream event handlers |
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314 |
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315 local stream_callbacks = { default_ns = "jabber:server" }; |
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316 |
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317 function stream_callbacks.handlestanza(session, stanza) |
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318 stanza = session.filter("stanzas/in", stanza); |
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319 session.thread:run(stanza); |
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320 end |
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321 |
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322 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams"; |
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323 |
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324 function stream_callbacks.streamopened(session, attr) |
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325 -- run _streamopened in async context |
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326 session.thread:run({ stream = "opened", attr = attr }); |
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327 end |
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328 |
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329 function stream_callbacks._streamopened(session, attr) |
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330 session.version = tonumber(attr.version) or 0; |
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331 session.had_stream = true; -- Had a stream opened at least once |
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332 |
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333 -- TODO: Rename session.secure to session.encrypted |
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334 if session.secure == false then |
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335 session.secure = true; |
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336 session.encrypted = true; |
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337 |
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338 local sock = session.conn:socket(); |
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339 if sock.info then |
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340 local info = sock:info(); |
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341 (session.log or log)("info", "Stream encrypted (%s with %s)", info.protocol, info.cipher); |
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342 session.compressed = info.compression; |
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343 else |
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344 (session.log or log)("info", "Stream encrypted"); |
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345 end |
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346 end |
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347 |
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348 if session.direction == "incoming" then |
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349 -- Send a reply stream header |
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350 |
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351 -- Validate to/from |
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352 local to, from = attr.to, attr.from; |
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353 if to then to = nameprep(attr.to); end |
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354 if from then from = nameprep(attr.from); end |
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355 if not to and attr.to then -- COMPAT: Some servers do not reliably set 'to' (especially on stream restarts) |
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356 session:close({ condition = "improper-addressing", text = "Invalid 'to' address" }); |
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357 return; |
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358 end |
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359 if not from and attr.from then -- COMPAT: Some servers do not reliably set 'from' (especially on stream restarts) |
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360 session:close({ condition = "improper-addressing", text = "Invalid 'from' address" }); |
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361 return; |
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362 end |
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363 |
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364 -- Set session.[from/to]_host if they have not been set already and if |
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365 -- this session isn't already authenticated |
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366 if session.type == "s2sin_unauthed" and from and not session.from_host then |
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367 session.from_host = from; |
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368 elseif from ~= session.from_host then |
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369 session:close({ condition = "improper-addressing", text = "New stream 'from' attribute does not match original" }); |
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370 return; |
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371 end |
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372 if session.type == "s2sin_unauthed" and to and not session.to_host then |
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373 session.to_host = to; |
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374 elseif to ~= session.to_host then |
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375 session:close({ condition = "improper-addressing", text = "New stream 'to' attribute does not match original" }); |
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376 return; |
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377 end |
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378 |
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379 -- For convenience we'll put the sanitised values into these variables |
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380 to, from = session.to_host, session.from_host; |
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381 |
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382 session.streamid = uuid_gen(); |
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383 (session.log or log)("debug", "Incoming s2s received %s", st.stanza("stream:stream", attr):top_tag()); |
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384 if to then |
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385 if not hosts[to] then |
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386 -- Attempting to connect to a host we don't serve |
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387 session:close({ |
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388 condition = "host-unknown"; |
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389 text = "This host does not serve "..to |
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390 }); |
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391 return; |
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392 elseif not hosts[to].modules.s2s then |
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393 -- Attempting to connect to a host that disallows s2s |
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394 session:close({ |
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395 condition = "policy-violation"; |
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396 text = "Server-to-server communication is disabled for this host"; |
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397 }); |
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398 return; |
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399 end |
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400 end |
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401 |
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402 if hosts[from] then |
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403 session:close({ condition = "undefined-condition", text = "Attempt to connect from a host we serve" }); |
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404 return; |
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405 end |
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406 |
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407 if session.secure and not session.cert_chain_status then |
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408 if check_cert_status(session) == false then |
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409 return; |
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410 end |
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411 end |
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412 |
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413 session:open_stream(session.to_host, session.from_host) |
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414 session.notopen = nil; |
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415 if session.version >= 1.0 then |
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416 local features = st.stanza("stream:features"); |
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417 |
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418 if to then |
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419 hosts[to].events.fire_event("s2s-stream-features", { origin = session, features = features }); |
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420 else |
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421 (session.log or log)("warn", "No 'to' on stream header from %s means we can't offer any features", from or session.ip or "unknown host"); |
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422 fire_global_event("s2s-stream-features-legacy", { origin = session, features = features }); |
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423 end |
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424 |
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425 if ( session.type == "s2sin" or session.type == "s2sout" ) or features.tags[1] then |
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426 log("debug", "Sending stream features: %s", features); |
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427 session.sends2s(features); |
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428 else |
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429 (session.log or log)("warn", "No stream features to offer, giving up"); |
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430 session:close({ condition = "undefined-condition", text = "No stream features to offer" }); |
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431 end |
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432 end |
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433 elseif session.direction == "outgoing" then |
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434 session.notopen = nil; |
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435 if not attr.id then |
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436 log("warn", "Stream response did not give us a stream id!"); |
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437 session:close({ condition = "undefined-condition", text = "Missing stream ID" }); |
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438 return; |
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439 end |
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440 session.streamid = attr.id; |
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441 |
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442 if session.secure and not session.cert_chain_status then |
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443 if check_cert_status(session) == false then |
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444 return; |
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445 end |
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446 end |
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447 |
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448 -- If server is pre-1.0, don't wait for features, just do dialback |
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449 if session.version < 1.0 then |
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450 if not session.dialback_verifying then |
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451 hosts[session.from_host].events.fire_event("s2sout-authenticate-legacy", { origin = session }); |
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452 else |
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453 mark_connected(session); |
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454 end |
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455 end |
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456 end |
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457 end |
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458 |
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459 function stream_callbacks._streamclosed(session) |
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460 (session.log or log)("debug", "Received </stream:stream>"); |
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461 session:close(false); |
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462 end |
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463 |
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464 function stream_callbacks.streamclosed(session, attr) |
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465 -- run _streamclosed in async context |
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466 session.thread:run({ stream = "closed", attr = attr }); |
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467 end |
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468 |
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469 function stream_callbacks.error(session, error, data) |
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470 if error == "no-stream" then |
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471 session.log("debug", "Invalid opening stream header (%s)", (data:gsub("^([^\1]+)\1", "{%1}"))); |
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472 session:close("invalid-namespace"); |
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473 elseif error == "parse-error" then |
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474 session.log("debug", "Server-to-server XML parse error: %s", error); |
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475 session:close("not-well-formed"); |
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476 elseif error == "stream-error" then |
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477 local condition, text = "undefined-condition"; |
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478 for child in data:childtags(nil, xmlns_xmpp_streams) do |
|
479 if child.name ~= "text" then |
|
480 condition = child.name; |
|
481 else |
|
482 text = child:get_text(); |
|
483 end |
|
484 if condition ~= "undefined-condition" and text then |
|
485 break; |
|
486 end |
|
487 end |
|
488 text = condition .. (text and (" ("..text..")") or ""); |
|
489 session.log("info", "Session closed by remote with error: %s", text); |
|
490 session:close(nil, text); |
|
491 end |
|
492 end |
|
493 |
|
494 --- Session methods |
|
495 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'}; |
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496 -- reason: stream error to send to the remote server |
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497 -- remote_reason: stream error received from the remote server |
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498 -- bounce_reason: stanza error to pass to bounce_sendq because stream- and stanza errors are different |
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499 local function session_close(session, reason, remote_reason, bounce_reason) |
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500 local log = session.log or log; |
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501 if session.conn then |
|
502 if session.notopen then |
|
503 if session.direction == "incoming" then |
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504 session:open_stream(session.to_host, session.from_host); |
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505 else |
|
506 session:open_stream(session.from_host, session.to_host); |
|
507 end |
|
508 end |
|
509 if reason then -- nil == no err, initiated by us, false == initiated by remote |
|
510 local stream_error; |
|
511 if type(reason) == "string" then -- assume stream error |
|
512 stream_error = st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }); |
|
513 elseif type(reason) == "table" and not st.is_stanza(reason) then |
|
514 stream_error = st.stanza("stream:error"):tag(reason.condition or "undefined-condition", stream_xmlns_attr):up(); |
|
515 if reason.text then |
|
516 stream_error:tag("text", stream_xmlns_attr):text(reason.text):up(); |
|
517 end |
|
518 if reason.extra then |
|
519 stream_error:add_child(reason.extra); |
|
520 end |
|
521 end |
|
522 if st.is_stanza(stream_error) then |
|
523 -- to and from are never unknown on outgoing connections |
|
524 log("debug", "Disconnecting %s->%s[%s], <stream:error> is: %s", |
|
525 session.from_host or "(unknown host)" or session.ip, session.to_host or "(unknown host)", session.type, reason); |
|
526 session.sends2s(stream_error); |
|
527 end |
|
528 end |
|
529 |
|
530 session.sends2s("</stream:stream>"); |
|
531 function session.sends2s() return false; end |
|
532 |
|
533 -- luacheck: ignore 422/reason |
|
534 -- FIXME reason should be managed in a place common to c2s, s2s, bosh, component etc |
|
535 local reason = remote_reason or (reason and (reason.text or reason.condition)) or reason; |
|
536 session.log("info", "%s s2s stream %s->%s closed: %s", session.direction:gsub("^.", string.upper), |
|
537 session.from_host or "(unknown host)", session.to_host or "(unknown host)", reason or "stream closed"); |
|
538 |
|
539 -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote |
|
540 local conn = session.conn; |
|
541 if reason == nil and not session.notopen and session.incoming then |
|
542 add_task(stream_close_timeout, function () |
|
543 if not session.destroyed then |
|
544 session.log("warn", "Failed to receive a stream close response, closing connection anyway..."); |
|
545 s2s_destroy_session(session, reason, bounce_reason); |
|
546 conn:close(); |
|
547 end |
|
548 end); |
|
549 else |
|
550 s2s_destroy_session(session, reason, bounce_reason); |
|
551 conn:close(); -- Close immediately, as this is an outgoing connection or is not authed |
|
552 end |
|
553 end |
|
554 end |
|
555 |
|
556 function session_stream_attrs(session, from, to, attr) -- luacheck: ignore 212/session |
|
557 if not from or (hosts[from] and hosts[from].modules.dialback) then |
|
558 attr["xmlns:db"] = 'jabber:server:dialback'; |
|
559 end |
|
560 if not from then |
|
561 attr.from = ''; |
|
562 end |
|
563 if not to then |
|
564 attr.to = ''; |
|
565 end |
|
566 end |
|
567 |
|
568 -- Session initialization logic shared by incoming and outgoing |
|
569 local function initialize_session(session) |
|
570 local stream = new_xmpp_stream(session, stream_callbacks, stanza_size_limit); |
|
571 |
|
572 session.thread = runner(function (stanza) |
|
573 if st.is_stanza(stanza) then |
|
574 core_process_stanza(session, stanza); |
|
575 elseif stanza.stream == "opened" then |
|
576 stream_callbacks._streamopened(session, stanza.attr); |
|
577 elseif stanza.stream == "closed" then |
|
578 stream_callbacks._streamclosed(session, stanza.attr); |
|
579 end |
|
580 end, runner_callbacks, session); |
|
581 |
|
582 local log = session.log or log; |
|
583 session.stream = stream; |
|
584 |
|
585 session.notopen = true; |
|
586 |
|
587 function session.reset_stream() |
|
588 session.notopen = true; |
|
589 session.streamid = nil; |
|
590 session.stream:reset(); |
|
591 end |
|
592 |
|
593 session.stream_attrs = session_stream_attrs; |
|
594 |
|
595 local filter = initialize_filters(session); |
|
596 local conn = session.conn; |
|
597 local w = conn.write; |
|
598 |
|
599 function session.sends2s(t) |
|
600 log("debug", "Sending[%s]: %s", session.type, t.top_tag and t:top_tag() or t:match("^[^>]*>?")); |
|
601 if t.name then |
|
602 t = filter("stanzas/out", t); |
|
603 end |
|
604 if t then |
|
605 t = filter("bytes/out", tostring(t)); |
|
606 if t then |
|
607 return w(conn, t); |
|
608 end |
|
609 end |
|
610 end |
|
611 |
|
612 function session.data(data) |
|
613 data = filter("bytes/in", data); |
|
614 if data then |
|
615 local ok, err = stream:feed(data); |
|
616 if ok then return; end |
|
617 log("debug", "Received invalid XML (%s) %d bytes: %q", err, #data, data:sub(1, 300)); |
|
618 if err == "stanza-too-large" then |
|
619 session:close({ condition = "policy-violation", text = "XML stanza is too big" }, nil, "Received invalid XML from remote server"); |
|
620 else |
|
621 session:close("not-well-formed", nil, "Received invalid XML from remote server"); |
|
622 end |
|
623 end |
|
624 end |
|
625 |
|
626 session.close = session_close; |
|
627 |
|
628 local handlestanza = stream_callbacks.handlestanza; |
|
629 function session.dispatch_stanza(session, stanza) -- luacheck: ignore 432/session |
|
630 return handlestanza(session, stanza); |
|
631 end |
|
632 |
|
633 module:fire_event("s2s-created", { session = session }); |
|
634 |
|
635 add_task(connect_timeout, function () |
|
636 if session.type == "s2sin" or session.type == "s2sout" then |
|
637 return; -- Ok, we're connected |
|
638 elseif session.type == "s2s_destroyed" then |
|
639 return; -- Session already destroyed |
|
640 end |
|
641 -- Not connected, need to close session and clean up |
|
642 (session.log or log)("debug", "Destroying incomplete session %s->%s due to inactivity", |
|
643 session.from_host or "(unknown)", session.to_host or "(unknown)"); |
|
644 session:close("connection-timeout"); |
|
645 end); |
|
646 end |
|
647 |
|
648 function runner_callbacks:ready() |
|
649 self.data.log("debug", "Runner %s ready (%s)", self.thread, coroutine.status(self.thread)); |
|
650 self.data.conn:resume(); |
|
651 end |
|
652 |
|
653 function runner_callbacks:waiting() |
|
654 self.data.log("debug", "Runner %s waiting (%s)", self.thread, coroutine.status(self.thread)); |
|
655 self.data.conn:pause(); |
|
656 end |
|
657 |
|
658 function runner_callbacks:error(err) |
|
659 (self.data.log or log)("error", "Traceback[s2s]: %s", err); |
|
660 end |
|
661 |
|
662 function listener.onconnect(conn) |
|
663 conn:setoption("keepalive", opt_keepalives); |
|
664 local session = sessions[conn]; |
|
665 if not session then -- New incoming connection |
|
666 session = s2s_new_incoming(conn); |
|
667 sessions[conn] = session; |
|
668 session.log("debug", "Incoming s2s connection"); |
|
669 initialize_session(session); |
|
670 else -- Outgoing session connected |
|
671 session:open_stream(session.from_host, session.to_host); |
|
672 end |
|
673 session.ip = conn:ip(); |
|
674 end |
|
675 |
|
676 function listener.onincoming(conn, data) |
|
677 local session = sessions[conn]; |
|
678 if session then |
|
679 session.data(data); |
|
680 end |
|
681 end |
|
682 |
|
683 function listener.onstatus(conn, status) |
|
684 if status == "ssl-handshake-complete" then |
|
685 local session = sessions[conn]; |
|
686 if session and session.direction == "outgoing" then |
|
687 session.log("debug", "Sending stream header..."); |
|
688 session:open_stream(session.from_host, session.to_host); |
|
689 end |
|
690 end |
|
691 end |
|
692 |
|
693 function listener.ondisconnect(conn, err) |
|
694 local session = sessions[conn]; |
|
695 if session then |
|
696 sessions[conn] = nil; |
|
697 (session.log or log)("debug", "s2s disconnected: %s->%s (%s)", session.from_host, session.to_host, err or "connection closed"); |
|
698 if session.secure == false and err then |
|
699 -- TODO util.error-ify this |
|
700 err = "Error during negotiation of encrypted connection: "..err; |
|
701 end |
|
702 s2s_destroy_session(session, err); |
|
703 end |
|
704 end |
|
705 |
|
706 function listener.onfail(data, err) |
|
707 local session = data and data.session; |
|
708 if session then |
|
709 if err and session.direction == "outgoing" and session.notopen then |
|
710 (session.log or log)("debug", "s2s connection attempt failed: %s", err); |
|
711 end |
|
712 (session.log or log)("debug", "s2s disconnected: %s->%s (%s)", session.from_host, session.to_host, err or "connection closed"); |
|
713 s2s_destroy_session(session, err); |
|
714 end |
|
715 end |
|
716 |
|
717 function listener.onreadtimeout(conn) |
|
718 local session = sessions[conn]; |
|
719 if session then |
|
720 local host = session.host or session.to_host; |
|
721 return (hosts[host] or prosody).events.fire_event("s2s-read-timeout", { session = session }); |
|
722 end |
|
723 end |
|
724 |
|
725 function listener.register_outgoing(conn, session) |
|
726 sessions[conn] = session; |
|
727 initialize_session(session); |
|
728 end |
|
729 |
|
730 function listener.ondetach(conn) |
|
731 sessions[conn] = nil; |
|
732 end |
|
733 |
|
734 function listener.onattach(conn, data) |
|
735 local session = data and data.session; |
|
736 if session then |
|
737 session.conn = conn; |
|
738 sessions[conn] = session; |
|
739 initialize_session(session); |
|
740 end |
|
741 end |
|
742 |
|
743 -- Complete the sentence "Your certificate " with what's wrong |
|
744 local function friendly_cert_error(session) --> string |
|
745 if session.cert_chain_status == "invalid" then |
|
746 if session.cert_chain_errors then |
|
747 local cert_errors = set.new(session.cert_chain_errors[1]); |
|
748 if cert_errors:contains("certificate has expired") then |
|
749 return "has expired"; |
|
750 elseif cert_errors:contains("self signed certificate") then |
|
751 return "is self-signed"; |
|
752 end |
|
753 end |
|
754 return "is not trusted"; -- for some other reason |
|
755 elseif session.cert_identity_status == "invalid" then |
|
756 return "is not valid for this name"; |
|
757 end |
|
758 -- this should normally be unreachable except if no s2s auth module was loaded |
|
759 return "could not be validated"; |
|
760 end |
|
761 |
|
762 function check_auth_policy(event) |
|
763 local host, session = event.host, event.session; |
|
764 local must_secure = secure_auth; |
|
765 |
|
766 if not must_secure and secure_domains[host] then |
|
767 must_secure = true; |
|
768 elseif must_secure and insecure_domains[host] then |
|
769 must_secure = false; |
|
770 end |
|
771 |
|
772 if must_secure and (session.cert_chain_status ~= "valid" or session.cert_identity_status ~= "valid") then |
|
773 local reason = friendly_cert_error(session); |
|
774 session.log("warn", "Forbidding insecure connection to/from %s because its certificate %s", host or session.ip or "(unknown host)", reason); |
|
775 -- XEP-0178 recommends closing outgoing connections without warning |
|
776 -- but does not give a rationale for this. |
|
777 -- In practice most cases are configuration mistakes or forgotten |
|
778 -- certificate renewals. We think it's better to let the other party |
|
779 -- know about the problem so that they can fix it. |
|
780 session:close({ condition = "not-authorized", text = "Your server's certificate "..reason }, |
|
781 nil, "Remote server's certificate "..reason); |
|
782 return false; |
|
783 end |
|
784 end |
|
785 |
|
786 module:hook("s2s-check-certificate", check_auth_policy, -1); |
|
787 |
|
788 module:hook("server-stopping", function(event) |
|
789 local reason = event.reason; |
|
790 for _, session in pairs(sessions) do |
|
791 session:close{ condition = "system-shutdown", text = reason }; |
|
792 end |
|
793 end, -200); |
|
794 |
|
795 |
|
796 |
|
797 module:provides("net", { |
|
798 name = "s2s"; |
|
799 listener = listener; |
|
800 default_port = 5269; |
|
801 encryption = "starttls"; |
|
802 ssl_config = { -- FIXME This is not used atm, see mod_tls |
|
803 verify = { "peer", "client_once", }; |
|
804 }; |
|
805 multiplex = { |
|
806 protocol = "xmpp-server"; |
|
807 pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:server%1.*>"; |
|
808 }; |
|
809 }); |
|
810 |