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Lua script to render an unmodified X-Forwarded-For header #1

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Lua script to render an unmodified X-Forwarded-For header #1

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3 changes: 2 additions & 1 deletion inner-proxy/conf/conf.d/default.conf
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,8 @@ server {
}

location /app {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Bad-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-For $realip_add_x_forwarded_for;
proxy_set_header X-Real-IP $remote_addr;
proxy_pass http://backend;
}
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11 changes: 11 additions & 0 deletions inner-proxy/conf/lua/realip-x-forwarded-for.lua
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
local _M = {}

function _M.run()
if (ngx.var.http_x_forwarded_for == "" or ngx.var.http_x_forwarded_for == nil) then
ngx.var.realip_add_x_forwarded_for = ngx.var.realip_remote_addr
else
ngx.var.realip_add_x_forwarded_for = ngx.var.http_x_forwarded_for .. ", " .. ngx.var.realip_remote_addr
end
end

return _M
5 changes: 5 additions & 0 deletions inner-proxy/conf/nginx.conf
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,11 @@ http {
set_real_ip_from 10.20.30.2/32;
real_ip_header X-Forwarded-For;

map $request $realip_add_x_forwarded_for { default ""; }
access_by_lua_block {
require("realip-x-forwarded-for").run()
}

# Include the rest of the configuration
include /etc/nginx/conf.d/*.conf;
}