Re: [pkix] Please clarify when and where wildcards should be matched in PKIX certificates
Tom Ritter <tom@ritter.vg> Fri, 05 June 2015 12:09 UTC
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From: Tom Ritter <tom@ritter.vg>
Date: Fri, 05 Jun 2015 05:09:26 -0700
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To: Jeffrey Walton <noloader@gmail.com>
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Cc: PKIX <pkix@ietf.org>, Tomoyuki Sahara <sahara@surt.net>
Subject: Re: [pkix] Please clarify when and where wildcards should be matched in PKIX certificates
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On 5 June 2015 at 03:42, Jeffrey Walton <noloader@gmail.com> wrote: > On Fri, Jun 5, 2015 at 5:28 AM, Tomoyuki Sahara <sahara@surt.net> wrote: >> On Fri, Jun 5, 2015 at 4:45 PM, Jeffrey Walton <noloader@gmail.com> wrote: >>> >>> And it may allow match just "*", if that is interpreted as the >>> leftmost label (but not the center label or rightmost label). Stranger >>> things have happened.... >> >> >> A site in Alexa top 10,000 presents such a certificate (but the cerfiticate >> is self-singed so it should be site administrator's mistake). >> >> Fortunately, Mozilla and libressl won't match such wildcards to any domain >> because they checks if presented identifier in server's certificate has at >> least 2 dots ("."). >> >> But the "two-dots" check is far from perfect: >> >> - A number of ccTLDs have more levels (e.g. www.example.co.jp) >> - It prevents new gTLDs from using wildcard certificates like "*.gtld". >> >> It can be more strict with Public Suffix List in theory but I don't think >> it is a good idea in practice. >> >> Any ideas? > > Tough problem in general. > > (1) At the second label (with the leftmost as a wildcard), there are > three top levels to consider. > > (A) Traditional Top Level Domains (call them gTLDs). *.COM, *.NET, *.MIL,etc > (B) Country Top Level Domains (call them ccTLDs). *.UK, *.CN, etc > (C) Vanity Top level Domains (call them vTLDS). *.GOOLGE and friends > > We can remediate (A) because its an exhaustive list. We just say NO. > > We can remediate (B) because its an exhaustive list of about 250, and > we can build a list of the authorities offline. In the absence of a > declared authority or delegate, we just say NO. > > I think (A) and (B) could (and should) be called out in PKIX > validation because validation is within purview of PKIX and the rules > are obvious. > > I don't know how to remediate (C). How do we say, *.GOOGLE is OK if > its certified by Google but not others? When we encounter *.GOOGLE > that claims to be certified by Google, how do we know its authentic? Technically, we don't need to remediate (C), because we're trying to support a use case no one has asked for. Or at least, not seriously. No vanity TLD has come to Mozilla or Chrome or Microsoft and said "Hey, we want to do *.vanity, but it doesn't work!"[0] Just as dotless vanity domains (http://vanity) aren't going to work[1], we can say that TLD wildcards aren't going to work. -tom [0] Right? [1] Right? That's decided, no?
- Re: [pkix] Please clarify when and where wildcard… Jeffrey Walton
- [pkix] Please clarify when and where wildcards sh… Jeffrey Walton
- Re: [pkix] Please clarify when and where wildcard… Tomoyuki Sahara
- Re: [pkix] Please clarify when and where wildcard… Jeffrey Walton
- Re: [pkix] Please clarify when and where wildcard… Tom Ritter
- Re: [pkix] Please clarify when and where wildcard… Mehner, Carl
- Re: [pkix] Please clarify when and where wildcard… Ryan Sleevi
- Re: [pkix] Please clarify when and where wildcard… Ryan Sleevi
- Re: [pkix] Please clarify when and where wildcard… Jeffrey Walton
- Re: [pkix] Please clarify when and where wildcard… Ryan Sleevi
- Re: [pkix] Please clarify when and where wildcard… Jeffrey Walton