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mod_rest: Add mapping for XEP-0215: External Service Discovery Enough to query and retrieve services.
author Kim Alvefur <zash@zash.se>
date Tue, 26 Oct 2021 17:52:15 +0200
parents cd36b16f6b35
children 9d65eb3fcb15
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1 ---
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2 labels:
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3 - 'Stage-Alpha'
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4 summary: 'Implementation of PROXY protocol versions 1 and 2'
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5 ...
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6
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7 Introduction
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8 ============
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9
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10 This module implements the PROXY protocol in versions 1 and 2, which fulfills
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11 the following usecase as described within the official protocol specifications:
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12
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13 > Relaying TCP connections through proxies generally involves a loss of the
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14 > original TCP connection parameters such as source and destination addresses,
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15 > ports, and so on.
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16 >
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17 > The PROXY protocol's goal is to fill the server's internal structures with the
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18 > information collected by the proxy that the server would have been able to get
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19 > by itself if the client was connecting directly to the server instead of via a
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20 > proxy.
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21
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22 You can find more information about the PROXY protocol on
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23 [the official website](https://www.haproxy.com/blog/haproxy/proxy-protocol/)
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24 or within
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25 [the official protocol specifications.](https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt)
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28 Usage
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29 =====
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30
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31 Copy the plugin into your prosody's modules directory. And add it
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32 between your enabled modules into the global section (modules\_enabled).
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33
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34 As the PROXY protocol specifications do not allow guessing if the PROXY protocol
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35 shall be used or not, you need to configure separate ports for all the services
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36 that should be exposed with PROXY protocol support:
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37
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38 ```lua
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39 --[[
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40 Maps TCP ports to a specific Prosody network service. Further information about
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41 available service names can be found further down below in the module documentation.
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42 ]]--
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43 proxy_port_mappings = {
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44 [15222] = "c2s",
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45 [15269] = "s2s"
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46 }
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47
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48 --[[
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49 Specifies a list of trusted hosts or networks which may use the PROXY protocol
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50 If not specified, it will default to: 127.0.0.1, ::1 (local connections only)
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51 An empty table ({}) can be configured to allow connections from any source.
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52 Please read the module documentation about potential security impact.
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53 ]]--
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54 proxy_trusted_proxies = {
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55 "192.168.10.1",
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56 "172.16.0.0/16"
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57 }
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58
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59 --[[
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60 While you can manually override the ports this module is listening on with
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61 the "proxy_ports" directive, it is highly recommended to not set it and instead
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62 only configure the appropriate mappings with "proxy_port_mappings", which will
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63 automatically start listening on all mapped ports.
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64
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65 Example: proxy_ports = { 15222, 15269 }
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66 ]]--
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67 ```
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68
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69 The above example configuration, which needs to be placed in the global section,
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70 would listen on both tcp/15222 and tcp/15269. All incoming connections have to
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71 originate from trusted hosts/networks (configured by _proxy_trusted_proxies_) and
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72 must be initiated by a PROXYv1 or PROXYv2 sender. After processing the PROXY
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73 protocol, those connections will get mapped to the configured service name.
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74
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75 Please note that each port handled by _mod_net_proxy_ must be mapped to another
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76 service name by adding an item to _proxy_port_mappings_, otherwise a warning will
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77 be printed during module initialization and all incoming connections to unmapped ports
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78 will be dropped after processing the PROXY protocol requests.
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79
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80 The service name can be found by analyzing the source of the module, as it is the
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81 same name as specified within the _name_ attribute when calling
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82 `module:provides("net", ...)` to initialize a network listener. The following table
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83 shows the names for the most commonly used Prosody modules:
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84
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85 ------------- --------------------------
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86 **Module** **Service Name**
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87 c2s c2s (Plain/StartTLS)
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88 s2s s2s (Plain/StartTLS)
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89 proxy65 proxy65 (Plain)
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90 http http (Plain)
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91 net_multiplex multiplex (Plain/StartTLS)
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92 ------------- --------------------------
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93
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94 This module should work with all services that are providing ports which either
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95 offer plaintext or StartTLS-based encryption. Please note that instead of using
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96 this module for HTTP-based services (BOSH/WebSocket) it might be worth resorting
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97 to use proxy which is able to process HTTP and insert a _X-Forwarded-For_ header
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98 instead.
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99
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100
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101 Example
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102 =======
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103
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104 This example provides you with a Prosody server that accepts regular connections on
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105 tcp/5222 (C2S) and tcp/5269 (S2S) while also offering dedicated PROXY protocol ports
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106 for both modules, configured as tcp/15222 (C2S) and tcp/15269 (S2S):
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107
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108 ```lua
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109 c2s_ports = {5222}
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110 s2s_ports = {5269}
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111 proxy_port_mappings = {
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112 [15222] = "c2s",
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113 [15269] = "s2s"
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114 }
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115 ```
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116
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117 After adjusting the global configuration of your Prosody server accordingly, you can
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118 configure your desired sender accordingly. Below is an example for a working HAProxy
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119 configuration which will listen on the default XMPP ports (5222+5269) and connect to
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120 your XMPP backend running on 192.168.10.10 using the PROXYv2 protocol:
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121
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122 ```
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123 defaults d-xmpp
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124 log global
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125 mode tcp
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126 option redispatch
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127 option tcplog
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128 option tcpka
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129 option clitcpka
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130 option srvtcpka
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131
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132 timeout connect 5s
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133 timeout client 24h
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134 timeout server 60m
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135
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136 frontend f-xmpp
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137 bind :::5222,:::5269 v4v6
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138 use_backend b-xmpp-c2s if { dst_port eq 5222 }
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139 use_backend b-xmpp-s2s if { dst_port eq 5269 }
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140
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141 backend b-xmpp-c2s
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142 balance roundrobin
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143 option independent-streams
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144 server mycoolprosodybox 192.168.10.10:15222 send-proxy-v2
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145
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146 backend b-xmpp-s2s
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147 balance roundrobin
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148 option independent-streams
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149 server mycoolprosodybox 192.168.10.10:15269 send-proxy-v2
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150 ```
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151
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152
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153 Limitations
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154 ===========
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155
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156 It is currently not possible to use this module for offering PROXY protocol support
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157 on SSL/TLS ports, which will automatically initiate a SSL handshake. This might be
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158 possible in the future, but it currently does not look like this could easily be
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159 implemented due to the current handling of such connections.
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160
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161
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162 Important Notes
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163 ===============
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164
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165 Please do not expose any ports offering PROXY protocol to the internet - while regular
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166 clients will be unable to use them anyways, it is outright dangerous and allows anyone
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167 to spoof the actual IP address. It is highly recommended to only allow PROXY
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168 connections from trusted sources, e.g. your loadbalancer.
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169
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170
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171 Compatibility
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172 =============
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173
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174 ----- -----
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175 trunk Works
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176 0.10 Works
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177 ----- -----