Tickets :: Comment on [#2865] Support for switching to a new password scheme

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Comment	>> I'm trying to wrap my head around whether or not this is a bad idea > >> security-wise - it seems dodgy to me. > > > > As you may have guessed, I don't really see a security problem with this > > patch -- it's just a way of finding out what scheme a password is stored > > in, and then comparing the plaintext accordingly. Here's two points that > > your response made me think about and my reasons for why they're not > > security problems. > > In case that an unknown (or no) encryption scheme is found, > > Auth::getCryptedPassword() assumes hex-encoded MD5 as default. In the > > worst case, we may end up comparing two passwords hashed with different > > functions. As finding collisions (i.e. two different inputs that produce > > the same output) is assumed to be infeasible for any (good) hash function, > > and, more generally, finding the pre-image of a hash function (i.e. > > finding the input given only the output) is also thought to be difficult, > > finding any input value for $plaintext for which the MD5-hex hash is the > > same as $encrypted (hashed and encoded with a different scheme) is > > difficult as well. > > The regular expression for finding the scheme is also very simple -- it > > looks for anything within curly brackets and uses it as the scheme name. > > Doing Bad Things(tm) with that is impossible because (a) $encrypted is > > from a trusted source and (b) if the scheme can't be found, the above > > kicks in. > > > > Maybe this behaviour could be turned on by a configuration option, with > > the default set to disabled. > > > >> Also, your patch doesn't take into account _not_ finding the encryption > >> type and never sets $encryption for that case. > > > > Yes. Sorry, that must have slipped my mind, but is trivial to fix. Tell me > > if you want me to do it.
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