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annotate mod_net_proxy/README.markdown @ 5668:ecfd7aece33b

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mod_measure_modules: Report module statuses via OpenMetrics Someone in the chat asked about a health check endpoint, which reminded me of mod_http_status, which provides access to module statuses with full details. After that, this idea came about, which seems natural. As noted in the README, it could be used to monitor that critical modules are in fact loaded correctly. As more modules use the status API, the more useful this module and mod_http_status becomes.
author Kim Alvefur <zash@zash.se>
date Fri, 06 Oct 2023 18:34:39 +0200
parents 9d65eb3fcb15
children
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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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27
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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 0.12 Works
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177 0.11 Works
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178 0.10 Works
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179 ----- -----