Re: MD5 for password hashes

[Rich Megginson <rmeggins@xxxxxxxxxx>]

Sam Tran wrote:

On 7/7/05, Sam Tran <stlist@xxxxxxxxx> wrote:
  

On 7/7/05, Rich Megginson <rmeggins@xxxxxxxxxx> wrote:
    

 Sam Tran wrote:
 On 7/7/05, Rich Megginson <rmeggins@xxxxxxxxxx> wrote:


 Sam Tran wrote:



 Hi all,

I compiled FDS from the latest sources.

I migrated a user entry from OpenLDAP to FDS as a test. For that user
entry I tried different password hash schemes for the userPassword
attribute and checked if it was successfully migrated to FDS. Here are
the results:



 Did you run this script first -
http://www.directory.fedora.redhat.com/download/openLDAP2Fedora.pl
- to
migrate the data that used MD5 passwords?



 {CRYPT} --> OK
(MD5} --> FAILED
{SMD5} --> FAILED
{MD5CRYPT} --> OK
{SHA} --> OK
{SSHA} --> OK

I thought that FDS supported MD5 password hash. Did I miss something?



 Not sure. I would have expected {MD5} to work but not {MD5CRYPT}. See
above.



 Thanks in advance.

Sam


 You should not need to run this script to do the migration. This
script just Base64 decodes the userPassword attribute and puts it in
the form {HASH}xxxxxxxx. FDS apparently understands the Base64 encoded
version of the password.

For SHA, SSHA, CRYPT and MD5CRYPT I didn't use this script and the
migration was successful. For MD5 I tried without and with the script:
it was unsuccessful in both cases.

 This is really bizarre, because MD5CRYPT should not work at all - it is not
supported by FDS.  The only thing I can think is that it is interpreting the
value as clear text.

 How did you verify that the migration was successful?

 Sam

      

I simply did a ldapsearch with a binddn:
./ldapsearch -h localhost -b "dc=example,dc=com" -D
"uid=joesmith,ou=people,dc=example,dc=com" -w - "objectclass=*"
    

I create a new user in FDS with a password I generated using this python module:
http://www.sabren.net/code/python/crypt/index.php3

The hash is MD5CRYPT. And it worked.

Try for yourself.

Don't forget to prepend {CRYPT} to the generated password.
  

Ah hah.  That's why it works.  But in FDS, {CRYPT} is not the same as MD5 crypt - FDS crypt uses the old unix crypt that used to be the standard for Solaris /etc/passwd and /etc/shadow (and other OSes).

dirving, any clues as to why {MD5} doesn't work?

Sam
  

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