I tried it on Xenial, but now I get the following error whatever I do
with LDAP:
SASL/EXTERNAL authentication started
ldap_sasl_interactive_bind_s: Unknown authentication method (-6)
additional info: SASL(-4): no mechanism available:
But, apart from that, trusty is a "long term support" release, and
supposed to get security fixes until April 2019
** Changed in: openldap (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1591681
Title:
Impossible to configure GnuTLS' %SERVER_PRECEDENCE setting in slapd
Status in openldap package in Ubuntu:
Confirmed
Bug description:
While securing our boxes, I noticed that testssl was flagging the
absence of server cipher order:
./testssl.sh localhost:636
Has server cipher order? nope (NOT ok)
While trying to set it using the following command, slapd just
crashed:
dapmodify -Y EXTERNAL -H ldapi:/// <<'EOF'
dn: cn=config
changetype: modify
replace: olcTLSCipherSuite
olcTLSCipherSuite:
SECURE:-VERS-SSL3.0:-3DES-CBC:-ARCFOUR-128:%SERVER_PRECEDENCE
-
EOF
Without the %SERVER_PRECEDENCE, it works.
According to https://gnutls.org/manual/html_node/Priority-Strings.html
and http://blog.lighttpd.net/articles/2013/06/01/mitigating-beast-
with-gnutls/ this is indeed the proper setting to add server cipher
order.
Same issue happens with %FALLBACK_SCSV ("Downgrade attack prevention
NOT supported"). There seems to be no setting to fix "Secure Client-
Initiated Renegotiation".
However, adding %SAFE_RENEGOTIATION (although not fixing anything) at
least doesn't crash slapd
1) root@xl:~# lsb_release -rd
Description: Ubuntu 14.04.4 LTS
Release: 14.04
2) root@xl:~# apt-cache policy slapd
slapd:
Installed: 2.4.31-1+nmu2ubuntu8.2
Candidate: 2.4.31-1+nmu2ubuntu8.2
Version table:
*** 2.4.31-1+nmu2ubuntu8.2 0
500 http://be.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64
Packages
100 /var/lib/dpkg/status
2.4.31-1+nmu2ubuntu8 0
500 http://be.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
3) What I expected to happen:
There should be a a way to enforce server cipher order in slapd, as
well as protect against Client-Initiated Renegotiation and prevent
downgrade attacks
4) What happened instead
When trying to enable these settings that would make slapd more
secure, it crashes (and after restart, the requested settings are
still not enabled)
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