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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCLIENT-1316) Certificate verification rejects IPv6 addresses which are not String-equal
Date Mon, 04 Feb 2013 12:58:13 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13570146#comment-13570146

Sebb commented on HTTPCLIENT-1316:

I've looked further at the patch, and it uses InetAddress.getByName() to parse the address
if it looks like an IPv6 address.
It then reformats the output of Inet6Address.getHostAddress().

That should be sufficient for purely comparison purposes - there's no need to canonicalize
the string format as per RFC5952.

Obviously, care needs to be taken that the code does not try to do any DNS lookups...
> Certificate verification rejects IPv6 addresses which are not String-equal
> --------------------------------------------------------------------------
>                 Key: HTTPCLIENT-1316
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1316
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpConn
>    Affects Versions: 4.2.3
>            Reporter: James Livingston
>             Fix For: Future
> org.apache.http.conn.ssl.AbstractVerifier.verify() does not correctly handle host name
verification when IPv6 addresses are used, as it simply does a string equality check when
doWildcard is false.
> http://tools.ietf.org/html/rfc5952#section-3.2.5 specifically mentions X.509 certificates
as an example when textual comparison of IPv6 addresses is not correct. Examples of incorrect
behaviour are with:
> * leading zeroes
> * zero compression
> * case insensitivity
> For example if you have a SSL certificate for the IP address 2001:0db8:aaaa:bbbb:cccc:0:0:0001,
the alternative representation of 2001:db8:AAAA:bbbb:cccc::1 should be accepted as a match.

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