On Tue, 07 Oct 2014, Murty, Ajeet (US - Arlington) wrote:
Hi Martin and Nathan,

Thank you for providing that info.
Unfortunately, my IPA server is running on CentOS, and the latest IPA version 
available through YUM is - 'ipa-server.i686 3.0.0-37.el6'.
The latest version of 389-DS through YUM is - '389-ds-base.i686 
1.2.11.15-34.el6_5 '.

Nessus scan had detected this null cipher -
   TLSv1
     NULL-SHA                     Kx=RSA         Au=RSA      Enc=None           
      Mac=SHA1

I found 2 'dse.ldif' files on disk -
       /etc/dirsrv/slapd-PKI-IPA/dse.ldif
       /etc/dirsrv/slapd-EXAMPLE-COM/dse.ldif

In each of them, I found this -
nsSSL3Ciphers: -rsa_null_md5,+rsa_rc4_128_md5,+rsa_rc4_40_md5,+rsa_rc2_40_md5,
+rsa_des_sha,+rsa_fips_des_sha,+rsa_3des_sha,+rsa_fips_3des_sha,+fortezza,+fo
rtezza_rc4_128_sha,+fortezza_null,+tls_rsa_export1024_with_rc4_56_sha,+tls_rs
a_export1024_with_des_cbc_sha


So to disable null cipher, I removed 'rsa_null_md5' from that list -
nsSSL3Ciphers: +rsa_rc4_128_md5,+rsa_rc4_40_md5,+rsa_rc2_40_md5,
+rsa_des_sha,+rsa_fips_des_sha,+rsa_3des_sha,+rsa_fips_3des_sha,+fortezza,+fo
rtezza_rc4_128_sha,+fortezza_null,+tls_rsa_export1024_with_rc4_56_sha,+tls_rs
a_export1024_with_des_cbc_sha

I restarted the entire IPA stack, and ran the scan again, I am still seeing 
that Null Cipher.

Any ideas on how to resolve this?
I can see also fortezza_null in the above list, maybe you are getting
into that one?


-----Original Message-----
From: Martin Kosek [mailto:mko...@redhat.com]
Sent: Tuesday, September 23, 2014 11:15 AM
To: Nathan Kinder; freeipa-users@redhat.com; Murty, Ajeet (US - Arlington)
Subject: Re: [Freeipa-users] weak and null ciphers detected on ldap ports

On 09/22/2014 10:07 PM, Nathan Kinder wrote:


On 09/22/2014 05:03 AM, Murty, Ajeet (US - Arlington) wrote:
Security scan of FreeIPA server ports uncovered weak, medium and null
ciphers on port 389 and 636. We are running 'ipa-server-3.0.0-37.el6.i686'.

How can I disable/remove these ciphers in my existing setup?

This has recently been worked on in this 389-ds-base ticket:

  https://fedorahosted.org/389/ticket/47838

As mentioned in the initial description of that ticket, you can
configure the allowed ciphers in the "cn=config" entry in 389-ds-base.
You can edit this over LDAP, or by stopping 389-ds-base and editing
/etc/dirsrv/slapd-<REALM>/dse.ldif.

Thanks,
-NGK

You can also check the FreeIPA counterpart:

https://fedorahosted.org/freeipa/ticket/4395

This issue is fixed in FreeIPA 4.0.3 (available in Copr build and Fedora 21+),
we would very much welcome if you can verify that this setup works for you!

Thanks,
Martin

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/ Alexander Bokovoy

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