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RE: OpenLDAP Need to be compliant with RFC 2830 (with regards to Server Identity Check) (ITS#1490)
This has been fixed since September 2, release 2.0.13. The current release
is 2.0.18. You should update your distribution.
-- Howard Chu
Chief Architect, Symas Corp. Director, Highland Sun
Symas: Premier OpenSource Development and Support
> -----Original Message-----
> From: owner-openldap-bugs@OpenLDAP.org
> [mailto:owner-openldap-bugs@OpenLDAP.org]On Behalf Of
> Sent: Tuesday, December 11, 2001 6:49 PM
> To: openldap-its@OpenLDAP.org
> Subject: OpenLDAP Need to be compliant with RFC 2830 (with regards to
> Server Identity Check) (ITS#1490)
> Full_Name: Kyle Johnson
> Version: 2.0.11
> OS: RedHat Linux 7.1
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (126.96.36.199)
> We have an enterprise LDAP directory to which connections will
> only be allowed
> via a secure connection (i.e. SSL). The server has a signed
> certificate from
> Verisgn, but we are unable to establish a secure connection. It
> appears that
> OpenLDAP is expecting (demanding really) that the CNAME in the
> DNS match the
> certificate. However, that is in direct violation of RFC 2830,
> which states:
> 3.6. Server Identity Check
> The client MUST check its understanding of the server's hostname
> against the server's identity as presented in the server's
> Certificate message, in order to prevent man-in-the-middle attacks.
> Matching is performed according to these rules:
> - The client MUST use the server hostname it used to open the LDAP
> connection as the value to compare against the server name as
> expressed in the server's certificate. The client MUST NOT use the
> server's canonical DNS name or any other derived form of name.
> - If a subjectAltName extension of type dNSName is present in the
> certificate, it SHOULD be used as the source of the server's
> - Matching is case-insensitive.
> - The "*" wildcard character is allowed. If present, it applies only
> to the left-most name component.
> Note the first rule. That is where the problem is.