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…nections Previous configuration would use the address and port provided in connection query params to proxy to the correct server. This was subject to manipulation, however, as someone could put whatever values they wanted in there. This would generally only result in getting back something else, but it could be used by a malicious actor to have someone follow an otherwise-genuine engine link that would redirect to a malicious link via the address param. Now, the nginx server-snippet uses a fork of lua-rest-mysql to look up the instance via the instanceID passed as part of the websocket. If it's a valid instance, then it will get the ipAddress from the instance record and proxy to that; otherwise it will terminate the connection attempt. Users cannot make that request proxy to any link they want to any more. This required making an initContainer on the nginx server that installs the and mounts the forked lua-resty-mysql plugin, as it is not included in the core ingress-nginx image. The SQL server connection values must be configured as environment variables here, and a new main-snippet makes them available for nginx to read, as normally nginx does not have access to any ENV_VARs. Resolves IR-5570
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