Re: open_basedir?

On 07.05.2019 at 12:11, Nikita Popov wrote: > The open_basedir ini setting has two significant problems: > > 1. It is a major performance hit, because it disables the realpath cache.. > > 2. Many people think it is a security feature and use it as such. However, > open_basedir is in reality a "best effort" mechanism, with known > workarounds and more regularly being found. Especially when it comes to > interactions with 3rd party libraries, enforcing open_basedir is simply > impossible. > > What open_basedir tries to do must be implemented on the operating system > level to work reliably (and of course such mechanisms exist, such as jails, > chroot and friends). > > I wonder if it is feasible to drop this ini setting? Enforcing this doesn't > really seem like any of PHP's business. If not, I think we need to at least > > a) make it clear in the documentation that this is *not* a security option > and only exists to prevent "accidents" and > b) update the security policy (https://wiki.php.net/security) to state that > open_basedir bypasses are not security issues. I believe this has been part > of Debian's security policy for some time already. Apparently, there has been no resolution for this issue so far. While I don't really care about the open_basdedir directive per se, I fully agree that we should not advertize it as security feature, and to clearly state this in the PHP manual, as well as in our security policy. Christoph