On Tue, Sep 18, 2018 at 10:06:49AM +0300, Reio Remma wrote:
> Hello!
>
> I'm curious as to what determines the password scheme used by OpenSMTPD on a
> Linux system (CentOS 7 in my case). When setting up the system I ended up
> with using SHA512, because it seems to be what works both in OpenSMTPD and
> Dovecot, but would really like to use Blowfish instead. Dovecot seems to
> work with it, but is there any way I can make OpenSMTPD also agree with it?
>
> Thanks,
> Reio
>
that's an easy one:
OpenSMTPD uses the crypt() function provided by your system and does not
care about the password scheme used as this is a system-specific detail.
On modern systems the crypt() function encodes the algorithm, rounds and
salt as a prefix to the encrypted password, as shown below:
$2b$09$fEv/zNZ/5hELpDH3Vq93AuygRLnySIcNXH78rq9WxPPbZJxmcdk5m
| | | |
| | | |__ encrypted password
| | |__ begining of salt
| |__ beginning of rounds
|__ beginning of cipher
But this encoding is only valid for my operating system, yours will have
a different one and the only thing you need to care about is if password
was generated using the same crypt() function that will be used validate
it.
I suggest your read the crypt(3) and passwd(1) man pages of your system.
--
Gilles Chehade
https://www.poolp.org @poolpOrg
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