converting password hashes

[Jan Martin Mikkelsen]

> On 29 Oct 2019, at 13:13, Wojciech Puchar <wojtek at puchar.net> wrote:
> 
> i want to convert accouts from one system where there was mail-only accounts using dovecot/postfix based system and SQL tables to my system, where accounts are real unix accounts - that do mail and other things.
> 
> I don't know all people's plaintext passwords, and i don't need to and want to, but i want new accounts to work with the same passwords
> 
> in SQL tables there are entries like this:
> 
> $1$aab7638c$Cn7BA/oU4mzr0QltXzV7Z0
> 
> and these works by simple cut and paste to /etc/master.passwd file
> 
> 
> but there are entries like:
> 
> {PLAIN-MD5}c575f55800a549930b9063b43af04f47
> 
> that doesn't
> 
> 
> is there a way to make it work without contacting over hundred people and telling them what new password they have?

If it is just MD5 with no salt, I suspect substituting “$1$$” for the “{PLAIN_MD5}” would be sufficient.


Regards,

Jan M.