Which technology are you using -
.NET 2.0 features the X509Chain class which does the heavy lifting - but
yeah - Windows hold a list of all trusted CAs - and a check for a trusted CA
compares the issuer with that list.
Another check you are missing is against CRLs (certificate revocation lists)
- you find the loction of the CRL in the CRL distribution point property of
the cert (usually an url or ldap address).
dominick
www.leastprivilege.com
-----Original Message-----
From: Nagareshwar Talekar [mailto:tnagareshwar@gmail.com]
Sent: Montag, 10. Juli 2006 17:59
To: security-basics@securityfocus.com; webappsec@securityfocus.com;
crypto@securityfocus.com
Cc: tnagareshwar@gmail.com
Subject: How to perform SSL certificate validation ?
Hi List,
I am working on implementation of LDAP client where in there is requirement
to validate the server's ssl certificate. This is similar to what browser
does in case of ssl enabled website. After reading few articles over net I
came to know that following checks needs to be done for verfication of ssl
certificate.
1) Check if certificate is not expired.
2) Common name on the certificate matches the DNS name of the server.
3) Checks if the CA is trused.
I don't know how to perform the check for 3rd step. How can we ensure
that CA is trusted? One of my colleague told that I have to store all
trusted
root certificates and then compare incoming certificate with existing
ones..
Is there any better way to check this ...?
Also I was told that certificate validation is done to prevent the
SSL-MITM attack
Is this the only reason or is there any other reason for which the SSL
certificate
validation is done ?
It will be great if you can throw some light in this matter. Any links to
relevant websites will do as well.
Thanks
--
With Regards
Nagareshwar
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