Mercurial > prosody-modules
annotate mod_net_proxy/mod_net_proxy.lua @ 5588:59acf7f540c1
mod_http_oauth2: Mention support for RFC 9207
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 07 Jul 2023 19:45:48 +0200 |
parents | 9d65eb3fcb15 |
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1 -- mod_net_proxy.lua |
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2 -- Copyright (C) 2018 Pascal Mathis <mail@pascalmathis.com> |
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3 -- |
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4 -- Implementation of PROXY protocol versions 1 and 2 |
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5 -- Specifications: https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt |
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6 |
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7 module:set_global(); |
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8 |
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9 -- Imports |
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10 local softreq = require "util.dependencies".softreq; |
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11 local bit = assert(softreq "bit" or softreq "bit32" or softreq "util.bitcompat", "No bit module found. See https://prosody.im/doc/depends#bitop"); |
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12 local hex = require "util.hex"; |
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13 local ip = require "util.ip"; |
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14 local net = require "util.net"; |
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15 local set = require "util.set"; |
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16 local portmanager = require "core.portmanager"; |
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17 |
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18 -- Backwards Compatibility |
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19 local function net_ntop_bc(input) |
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20 if input:len() == 4 then |
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21 return string.format("%d.%d.%d.%d", input:byte(1, 4)); |
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22 elseif input:len() == 16 then |
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23 local octets = { nil, nil, nil, nil, nil, nil, nil, nil }; |
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24 |
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25 -- Convert received bytes into IPv6 address and skip leading zeroes for each group |
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26 for index = 1, 8 do |
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27 local high, low = input:byte(index * 2 - 1, index * 2); |
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28 octets[index] = string.format("%x", high * 256 + low); |
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29 end |
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30 local address = table.concat(octets, ":", 1, 8); |
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31 |
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32 -- Search for the longest sequence of zeroes |
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33 local token; |
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34 local length = (address:match("^0:[0:]+()") or 1) - 1; |
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35 for s in address:gmatch(":0:[0:]+") do |
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36 if length < #s then |
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37 length, token = #s, s; |
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38 end |
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39 end |
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40 |
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41 -- Return the shortened IPv6 address |
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42 return address:gsub(token or "^0:[0:]+", "::", 1); |
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43 end |
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44 end |
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45 |
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46 local net_ntop = net.ntop or net_ntop_bc |
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47 |
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48 -- Utility Functions |
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49 local function _table_invert(input) |
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50 local output = {}; |
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51 for key, value in pairs(input) do |
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52 output[value] = key; |
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53 end |
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54 return output; |
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55 end |
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56 |
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57 -- Constants |
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58 local ADDR_FAMILY = { UNSPEC = 0x0, INET = 0x1, INET6 = 0x2, UNIX = 0x3 }; |
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59 local ADDR_FAMILY_STR = _table_invert(ADDR_FAMILY); |
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60 local TRANSPORT = { UNSPEC = 0x0, STREAM = 0x1, DGRAM = 0x2 }; |
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61 local TRANSPORT_STR = _table_invert(TRANSPORT); |
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62 |
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63 local PROTO_MAX_HEADER_LENGTH = 256; |
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64 local PROTO_HANDLERS = { |
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65 PROXYv1 = { signature = hex.from("50524F5859"), callback = nil }, |
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66 PROXYv2 = { signature = hex.from("0D0A0D0A000D0A515549540A"), callback = nil } |
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67 }; |
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68 local PROTO_HANDLER_STATUS = { SUCCESS = 0, POSTPONE = 1, FAILURE = 2 }; |
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69 |
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70 -- Configuration Variables |
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71 local config_mappings = module:get_option("proxy_port_mappings", {}); |
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72 local config_ports = module:get_option_set("proxy_ports", {}); |
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73 local config_trusted_proxies = module:get_option_set("proxy_trusted_proxies", {"127.0.0.1", "::1"}); |
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74 |
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75 -- Persistent In-Memory Storage |
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76 local sessions = {}; |
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77 local mappings = {}; |
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78 local trusted_networks = set.new(); |
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79 |
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80 -- Proxy Data Methods |
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81 local proxy_data_mt = {}; proxy_data_mt.__index = proxy_data_mt; |
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82 |
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83 function proxy_data_mt:describe() |
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84 return string.format("proto=%s/%s src=%s:%d dst=%s:%d", |
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85 self:addr_family_str(), self:transport_str(), self:src_addr(), self:src_port(), self:dst_addr(), self:dst_port()); |
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86 end |
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87 |
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88 function proxy_data_mt:addr_family_str() |
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89 return ADDR_FAMILY_STR[self._addr_family] or ADDR_FAMILY_STR[ADDR_FAMILY.UNSPEC]; |
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90 end |
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91 |
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92 function proxy_data_mt:transport_str() |
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93 return TRANSPORT_STR[self._transport] or TRANSPORT_STR[TRANSPORT.UNSPEC]; |
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94 end |
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95 |
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96 function proxy_data_mt:version() |
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97 return self._version; |
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98 end |
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99 |
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100 function proxy_data_mt:addr_family() |
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101 return self._addr_family; |
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102 end |
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103 |
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104 function proxy_data_mt:transport() |
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105 return self._transport; |
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106 end |
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107 |
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108 function proxy_data_mt:src_addr() |
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109 return self._src_addr; |
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110 end |
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111 |
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112 function proxy_data_mt:src_port() |
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113 return self._src_port; |
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114 end |
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115 |
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116 function proxy_data_mt:dst_addr() |
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117 return self._dst_addr; |
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118 end |
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119 |
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120 function proxy_data_mt:dst_port() |
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121 return self._dst_port; |
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122 end |
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123 |
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124 -- Protocol Handler Functions |
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125 PROTO_HANDLERS["PROXYv1"].callback = function(conn, session) |
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126 local addr_family_mappings = { TCP4 = ADDR_FAMILY.INET, TCP6 = ADDR_FAMILY.INET6 }; |
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127 |
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128 -- Postpone processing if CRLF (PROXYv1 header terminator) does not exist within buffer |
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129 if session.buffer:find("\r\n") == nil then |
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130 return PROTO_HANDLER_STATUS.POSTPONE, nil; |
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131 end |
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132 |
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133 -- Declare header pattern and match current buffer against pattern |
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134 local header_pattern = "^PROXY (%S+) (%S+) (%S+) (%d+) (%d+)\r\n"; |
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135 local addr_family, src_addr, dst_addr, src_port, dst_port = session.buffer:match(header_pattern); |
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136 src_port, dst_port = tonumber(src_port), tonumber(dst_port); |
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137 |
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138 -- Ensure that header was successfully parsed and contains a valid address family |
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139 if addr_family == nil or src_addr == nil or dst_addr == nil or src_port == nil or dst_port == nil then |
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140 module:log("warn", "Received unparseable PROXYv1 header from %s", conn:ip()); |
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141 return PROTO_HANDLER_STATUS.FAILURE, nil; |
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142 end |
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143 if addr_family_mappings[addr_family] == nil then |
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144 module:log("warn", "Received invalid PROXYv1 address family from %s: %s", conn:ip(), addr_family); |
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145 return PROTO_HANDLER_STATUS.FAILURE, nil; |
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146 end |
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147 |
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148 -- Ensure that received source and destination ports are within 1 and 65535 (0xFFFF) |
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149 if src_port <= 0 or src_port >= 0xFFFF then |
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150 module:log("warn", "Received invalid PROXYv1 source port from %s: %d", conn:ip(), src_port); |
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151 return PROTO_HANDLER_STATUS.FAILURE, nil; |
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152 end |
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153 if dst_port <= 0 or dst_port >= 0xFFFF then |
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154 module:log("warn", "Received invalid PROXYv1 destination port from %s: %d", conn:ip(), dst_port); |
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155 return PROTO_HANDLER_STATUS.FAILURE, nil; |
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156 end |
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157 |
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158 -- Ensure that received source and destination address can be parsed |
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159 local _, err = ip.new_ip(src_addr); |
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160 if err ~= nil then |
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161 module:log("warn", "Received unparseable PROXYv1 source address from %s: %s", conn:ip(), src_addr); |
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2963
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162 return PROTO_HANDLER_STATUS.FAILURE, nil; |
2930
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163 end |
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164 _, err = ip.new_ip(dst_addr); |
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165 if err ~= nil then |
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166 module:log("warn", "Received unparseable PROXYv1 destination address from %s: %s", conn:ip(), dst_addr); |
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167 return PROTO_HANDLER_STATUS.FAILURE, nil; |
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168 end |
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169 |
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170 -- Strip parsed header from session buffer and build proxy data |
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171 session.buffer = session.buffer:gsub(header_pattern, ""); |
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172 |
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173 local proxy_data = { |
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174 _version = 1, |
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175 _addr_family = addr_family, _transport = TRANSPORT.STREAM, |
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176 _src_addr = src_addr, _src_port = src_port, |
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177 _dst_addr = dst_addr, _dst_port = dst_port |
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178 }; |
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179 setmetatable(proxy_data, proxy_data_mt); |
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180 |
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181 -- Return successful response with gathered proxy data |
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182 return PROTO_HANDLER_STATUS.SUCCESS, proxy_data; |
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183 end |
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184 |
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185 PROTO_HANDLERS["PROXYv2"].callback = function(conn, session) |
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186 -- Postpone processing if less than 16 bytes are available |
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187 if #session.buffer < 16 then |
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188 return PROTO_HANDLER_STATUS.POSTPONE, nil; |
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189 end |
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|
190 |
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191 -- Parse first 16 bytes of protocol header |
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192 local version = bit.rshift(bit.band(session.buffer:byte(13), 0xF0), 4); |
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193 local command = bit.band(session.buffer:byte(13), 0x0F); |
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194 local addr_family = bit.rshift(bit.band(session.buffer:byte(14), 0xF0), 4); |
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195 local transport = bit.band(session.buffer:byte(14), 0x0F); |
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196 local length = bit.bor(session.buffer:byte(16), bit.lshift(session.buffer:byte(15), 8)); |
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197 |
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198 -- Postpone processing if less than 16+<length> bytes are available |
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199 if #session.buffer < 16 + length then |
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200 return PROTO_HANDLER_STATUS.POSTPONE, nil; |
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201 end |
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|
202 |
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203 -- Ensure that version number is correct |
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|
204 if version ~= 0x2 then |
2962
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2961
diff
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|
205 module:log("warn", "Received unsupported PROXYv2 version from %s: %d", conn:ip(), version); |
2930
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206 return PROTO_HANDLER_STATUS.FAILURE, nil; |
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207 end |
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|
208 |
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|
209 local payload = session.buffer:sub(17); |
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210 if command == 0x0 then |
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211 -- Gather source/destination addresses and ports from local socket |
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|
212 local src_addr, src_port = conn:socket():getpeername(); |
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213 local dst_addr, dst_port = conn:socket():getsockname(); |
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|
214 |
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215 -- Build proxy data based on real connection information |
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216 local proxy_data = { |
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217 _version = version, |
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218 _addr_family = addr_family, _transport = transport, |
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219 _src_addr = src_addr, _src_port = src_port, |
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220 _dst_addr = dst_addr, _dst_port = dst_port |
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221 }; |
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222 setmetatable(proxy_data, proxy_data_mt); |
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223 |
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224 -- Return successful response with gathered proxy data |
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225 return PROTO_HANDLER_STATUS.SUCCESS, proxy_data; |
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226 elseif command == 0x1 then |
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227 local offset = 1; |
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228 local src_addr, src_port, dst_addr, dst_port; |
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229 |
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230 -- Verify transport protocol is either STREAM or DGRAM |
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231 if transport ~= TRANSPORT.STREAM and transport ~= TRANSPORT.DGRAM then |
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232 module:log("warn", "Received unsupported PROXYv2 transport from %s: 0x%02X", conn:ip(), transport); |
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233 return PROTO_HANDLER_STATUS.FAILURE, nil; |
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234 end |
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235 |
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236 -- Parse source and destination addresses |
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237 if addr_family == ADDR_FAMILY.INET then |
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238 src_addr = net_ntop(payload:sub(offset, offset + 3)); offset = offset + 4; |
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239 dst_addr = net_ntop(payload:sub(offset, offset + 3)); offset = offset + 4; |
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240 elseif addr_family == ADDR_FAMILY.INET6 then |
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241 src_addr = net_ntop(payload:sub(offset, offset + 15)); offset = offset + 16; |
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242 dst_addr = net_ntop(payload:sub(offset, offset + 15)); offset = offset + 16; |
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243 elseif addr_family == ADDR_FAMILY.UNIX then |
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244 src_addr = payload:sub(offset, offset + 107); offset = offset + 108; |
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245 dst_addr = payload:sub(offset, offset + 107); offset = offset + 108; |
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246 end |
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247 |
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248 -- Parse source and destination ports |
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249 if addr_family == ADDR_FAMILY.INET or addr_family == ADDR_FAMILY.INET6 then |
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250 src_port = bit.bor(payload:byte(offset + 1), bit.lshift(payload:byte(offset), 8)); offset = offset + 2; |
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251 -- luacheck: ignore 311 |
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252 dst_port = bit.bor(payload:byte(offset + 1), bit.lshift(payload:byte(offset), 8)); offset = offset + 2; |
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253 end |
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254 |
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255 -- Strip parsed header from session buffer and build proxy data |
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256 session.buffer = session.buffer:sub(17 + length); |
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257 |
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258 local proxy_data = { |
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259 _version = version, |
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260 _addr_family = addr_family, _transport = transport, |
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261 _src_addr = src_addr, _src_port = src_port, |
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262 _dst_addr = dst_addr, _dst_port = dst_port |
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263 }; |
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264 setmetatable(proxy_data, proxy_data_mt); |
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265 |
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266 -- Return successful response with gathered proxy data |
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267 return PROTO_HANDLER_STATUS.SUCCESS, proxy_data; |
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268 else |
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269 module:log("warn", "Received unsupported PROXYv2 command from %s: 0x%02X", conn:ip(), command); |
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270 return PROTO_HANDLER_STATUS.FAILURE, nil; |
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271 end |
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272 end |
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273 |
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274 -- Wrap an existing connection with the provided proxy data. This will override several methods of the 'conn' object to |
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275 -- return the proxied source instead of the source which initiated the TCP connection. Afterwards, the listener of the |
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276 -- connection gets set according to the globally defined port<>service mappings and the methods 'onconnect' and |
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277 -- 'onincoming' are being called manually with the current session buffer. |
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278 local function wrap_proxy_connection(conn, session, proxy_data) |
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279 -- Override and add functions of 'conn' object when source information has been collected |
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280 conn.proxyip, conn.proxyport = conn.ip, conn.port; |
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281 if proxy_data:src_addr() ~= nil and proxy_data:src_port() ~= nil then |
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282 conn.ip = function() |
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283 return proxy_data:src_addr(); |
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284 end |
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285 conn.port = function() |
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286 return proxy_data:src_port(); |
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287 end |
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288 conn.clientport = conn.port; |
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289 end |
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290 |
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291 -- Attempt to find service by processing port<>service mappings |
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292 local mapping = mappings[tonumber(conn:serverport())]; |
2930
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293 if mapping == nil then |
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294 conn:close(); |
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295 module:log("warn", "Connection %s@%s terminated: Could not find mapping for port %d", |
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296 conn:ip(), conn:proxyip(), conn:serverport()); |
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297 return; |
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298 end |
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299 |
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300 if mapping.service == nil then |
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301 local service = portmanager.get_service(mapping.service_name); |
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302 |
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303 if service ~= nil then |
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304 mapping.service = service; |
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305 else |
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|
306 conn:close(); |
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307 module:log("warn", "Connection %s@%s terminated: Could not process mapping for unknown service %s", |
2930
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308 conn:ip(), conn:proxyip(), mapping.service_name); |
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309 return; |
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310 end |
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311 end |
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312 |
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313 -- Pass connection to actual service listener and simulate onconnect/onincoming callbacks |
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314 local service_listener = mapping.service.listener; |
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315 |
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316 module:log("info", "Passing proxied connection %s:%d to service %s", conn:ip(), conn:port(), mapping.service_name); |
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317 conn:setlistener(service_listener); |
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318 if service_listener.onconnect then |
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319 service_listener.onconnect(conn); |
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320 end |
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321 return service_listener.onincoming(conn, session.buffer); |
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322 end |
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323 |
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324 local function is_trusted_proxy(conn) |
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325 -- If no trusted proxies were configured, trust any incoming connection |
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326 -- While this may seem insecure, the module defaults to only trusting 127.0.0.1 and ::1 |
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327 if trusted_networks:empty() then |
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328 return true; |
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329 end |
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330 |
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331 -- Iterate through all trusted proxies and check for match against connected IP address |
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332 local conn_ip = ip.new_ip(conn:ip()); |
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333 for trusted_network in trusted_networks:items() do |
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334 if ip.match(trusted_network.ip, conn_ip, trusted_network.cidr) then |
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335 return true; |
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336 end |
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337 end |
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338 |
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339 -- Connection does not match any trusted proxy |
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340 return false; |
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341 end |
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342 |
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343 -- Network Listener Methods |
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344 local listener = {}; |
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345 |
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346 function listener.onconnect(conn) |
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347 -- Silently drop connections with an IP address of <nil>, which can happen when the socket was closed before the |
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348 -- responsible net.server backend was able to grab the IP address of the connecting client. |
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349 if conn:ip() == nil then |
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350 conn:close(); |
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351 return; |
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352 end |
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353 |
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354 -- Check if connection is coming from a trusted proxy |
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355 if not is_trusted_proxy(conn) then |
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356 conn:close(); |
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357 module:log("warn", "Dropped connection from untrusted proxy: %s", conn:ip()); |
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358 return; |
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359 end |
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360 |
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361 -- Initialize session variables |
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362 sessions[conn] = { |
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363 handler = nil; |
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364 buffer = nil; |
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365 }; |
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366 end |
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367 |
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368 function listener.onincoming(conn, data) |
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369 -- Abort processing if no data has been received |
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370 if not data then |
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371 return; |
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372 end |
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373 |
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374 -- Lookup session for connection and append received data to buffer |
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375 local session = sessions[conn]; |
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376 session.buffer = session.buffer and session.buffer .. data or data; |
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377 |
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378 -- Attempt to determine protocol handler if not done previously |
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379 if session.handler == nil then |
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380 -- Match current session buffer against all known protocol signatures to determine protocol handler |
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381 for handler_name, handler in pairs(PROTO_HANDLERS) do |
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382 if session.buffer:find("^" .. handler.signature) ~= nil then |
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383 session.handler = handler.callback; |
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384 module:log("debug", "Detected %s connection from %s:%d", handler_name, conn:ip(), conn:port()); |
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385 break; |
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386 end |
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387 end |
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388 |
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389 -- Decide between waiting for a complete header signature or terminating the connection when no handler has been found |
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390 if session.handler == nil then |
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391 -- Terminate connection if buffer size has exceeded tolerable maximum size |
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392 if #session.buffer > PROTO_MAX_HEADER_LENGTH then |
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393 conn:close(); |
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394 module:log("warn", "Connection %s:%d terminated: No valid PROXY header within %d bytes", |
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395 conn:ip(), conn:port(), PROTO_MAX_HEADER_LENGTH); |
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396 end |
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397 |
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398 -- Skip further processing without a valid protocol handler |
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399 module:log("debug", "No valid header signature detected from %s:%d, waiting for more data...", |
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400 conn:ip(), conn:port()); |
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401 return; |
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402 end |
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403 end |
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|
404 |
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|
405 -- Execute proxy protocol handler and process response |
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406 local response, proxy_data = session.handler(conn, session); |
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407 if response == PROTO_HANDLER_STATUS.SUCCESS then |
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408 module:log("info", "Received PROXY header from %s: %s", conn:ip(), proxy_data:describe()); |
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409 return wrap_proxy_connection(conn, session, proxy_data); |
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410 elseif response == PROTO_HANDLER_STATUS.POSTPONE then |
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|
411 module:log("debug", "Postponed parsing of incomplete PROXY header received from %s", conn:ip()); |
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412 return; |
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413 elseif response == PROTO_HANDLER_STATUS.FAILURE then |
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414 conn:close(); |
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|
415 module:log("warn", "Connection %s terminated: Could not process PROXY header from client, " + |
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416 "see previous log messages.", conn:ip()); |
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417 return; |
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|
418 else |
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419 -- This code should be never reached, but is included for completeness |
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420 conn:close(); |
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421 module:log("warn", "Connection terminated: Received invalid protocol handler response with code %d", response); |
2930
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422 return; |
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423 end |
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424 end |
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|
425 |
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|
426 function listener.ondisconnect(conn) |
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|
427 sessions[conn] = nil; |
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428 end |
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|
429 |
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|
430 listener.ondetach = listener.ondisconnect; |
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431 |
2963
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432 -- Parse trusted proxies which can either contain single hosts or networks |
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433 if not config_trusted_proxies:empty() then |
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|
434 for trusted_proxy in config_trusted_proxies:items() do |
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435 local network = {}; |
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436 network.ip, network.cidr = ip.parse_cidr(trusted_proxy); |
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|
437 trusted_networks:add(network); |
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438 end |
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439 else |
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440 module:log("warn", "No trusted proxies configured, all connections will be accepted - this might be dangerous"); |
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441 end |
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442 |
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443 -- Process all configured port mappings and generate a list of mapped ports |
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444 local mapped_ports = {}; |
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445 for port, mapping in pairs(config_mappings) do |
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446 port = tonumber(port); |
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447 table.insert(mapped_ports, port); |
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448 mappings[port] = { |
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449 service_name = mapping, |
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450 service = nil, |
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451 }; |
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452 end |
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453 |
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454 -- Log error message when user manually specifies ports without configuring the necessary port mappings |
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455 if not config_ports:empty() then |
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456 local missing_ports = config_ports - set.new(mapped_ports); |
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457 if not missing_ports:empty() then |
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458 module:log("error", "Missing port<>service mappings for these ports: %s", tostring(missing_ports)); |
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459 end |
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460 end |
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461 |
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462 -- Register the previously declared network listener |
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463 module:provides("net", { |
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464 name = "proxy"; |
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465 listener = listener; |
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466 default_ports = mapped_ports; |
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467 }); |