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Re: (ITS#6589) Patch - Mozilla NSS - support use of self signed CA certs as server certs
- To: openldap-its@OpenLDAP.org
- Subject: Re: (ITS#6589) Patch - Mozilla NSS - support use of self signed CA certs as server certs
- From: firstname.lastname@example.org
- Date: Wed, 14 Jul 2010 19:05:15 GMT
- Auto-submitted: auto-generated (OpenLDAP-ITS)
Rich Megginson wrote:
> Howard Chu wrote:
>> email@example.com wrote:
>>> Full_Name: Rich Megginson
>>> Version: 2.4.23
>>> OS: Fedora
>>> Submission from: (NULL) (220.127.116.11)
>>> MozNSS doesn't like self-signed CA certs that are also used for
>>> TLS/SSL server certs (such as generated by openssl req -x509)
>>> CERT_VerifyCertificateNow returns SEC_ERROR_UNTRUSTED_ISSUER in that
>>> so, see if the cert and issuer are the same cert, and allow the
>>> use of it (with a warning)
>> If you checked to see if the issuer is already trusted, I guess the
>> patch is OK.
>> But that aside, MozNSS's behavior sounds correct to me, and our
>> documentation says to use explicit CA certs, separate from the server
>> cert. Is it really a good idea to break this validation check?
> Probably not, but openssl seems to allow it. This provides parity with
> the openssl implementation.
> This issue came up when testing openldap with NSS support in Fedora.
> The Fedora package creates a self signed CA cert using openssl req
> -x509. This works with openldap+openssl, but fails with openldap+moznss.
In the OpenSSL case, it only succeeds if the cert is configured as both a CA
cert and a server cert. I.e., the client must have been configured to trust
the cert already. I believe for your patch, it should fail when
CERT_FindCertIssuer() returns NULL. No?
>> Also, where does this check occur in the main sequence of verification
>> - has the BasicConstraints, KeyUsage, and/or NetscapeCertType already
>> been checked successfully?
> Yes. This check occurs in the cert chain processing, which is done last.
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/