Storing of salt in freeradius

Mark mark at edgewire.sg
Wed Jan 19 10:05:19 CET 2011


Hi Fajar,

How did you generate that hash? md5sum of "testpass" doesn't return that value for me.

On 19-Jan-2011, at 3:07 PM, Fajar A. Nugraha wrote:

> On Wed, Jan 19, 2011 at 12:39 PM, Mark <mark at edgewire.sg> wrote:
> Hi folks,
> 
> Been trying to look for information on this but haven't been able to find anything, prompting me to turn to the mailing list for help.
> 
> In the event of using salted md5 hashes for passwords, where exactly does one store the salt?
> 
> In the beginning of the password.
>  
> There doesn't seem to be a place within the FR config  to do that. Any advice would be much appreciated.
> 
> 
> No special place needed.
> 
> You're probably confusing MD5-Password and Crypt-Password (which in turn can use MD5 hash). For example, if you use PAP, these three attributes will allow access when user enter password "testpass":
> 
> Cleartext-Password := "testpass"
> MD5-Password := "179ad45c6ce2cb97cf1029e212046e81"
> Crypt-Password := "$1$12345678$duTc/02K9TK/XCYFyofbZ/"
> Crypt-Password := "122U0BPYjrauc"
> 
> MD5-Password does not have any salt.
> Crypt-Password in the first example has the salt "$1$12345678$", with MD5-based hash (crypted passwords have the hash in front of them, which for MD5 starts with $1$ and is 12 characters long)
> Crypt-Password in the second example has the salt "12", with DES-based hash
> 
> See also:
> http://freeradius.org/radiusd/man/rlm_pap.txt
> http://en.wikipedia.org/wiki/Crypt_(Unix)#MD5-based_scheme
> http://id.php.net/manual/en/function.crypt.php
> 
> -- 
> Fajar
> -
> List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html

Kind regards,

Mark

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