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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    1. Colm MacCárthaigh‏ @colmmacc 28 Mar 2018
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      Replying to @VDukhovni @mdhardeman

      You're right about expired certificates, but TLS provides actual security too. That's my sense of the cost-benefit trade-off. DNSSEC isn't worth it. CloudFlare could be 100% perfect at operations and still suffer when an ISP screws up DNSSEC on the resolvers. Not so with TLS.

      1 reply 0 retweets 0 likes
    2. Viktor Dukhovni‏ @VDukhovni 28 Mar 2018
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      Replying to @colmmacc @mdhardeman

      Fine with you making your own tradeoffs. However, you state as black and white facts what are really personal prefs. My domain is monitored via proactive alerts well before sig expiry. DANE protects my email. Let's avoid zealous maxims, be right not righteous.

      1 reply 0 retweets 1 like
    3. Colm MacCárthaigh‏ @colmmacc 28 Mar 2018
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      Replying to @VDukhovni @mdhardeman

      But I am right. DNSSEC doesn't actually work and it does cause outages. Don't use it. Get out of here with this righteous nonsense!

      1 reply 0 retweets 0 likes
    4. Viktor Dukhovni‏ @VDukhovni 28 Mar 2018
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      Replying to @colmmacc @mdhardeman

      It works quite well for many users. What you say is hyperbole. It may suit your needs and preferences, but is not a truth to impart to the world.

      1 reply 0 retweets 0 likes
    5. Colm MacCárthaigh‏ @colmmacc 28 Mar 2018
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      Replying to @VDukhovni @mdhardeman

      DNSSEC doesn't actually work. That's not hyperbolic, it really doesn't work. It does cause outages, again, not hyperbole. Please don't mislead users otherwise, it's not responsible. Again: Don't use it.

      1 reply 0 retweets 0 likes
    6. Viktor Dukhovni‏ @VDukhovni 28 Mar 2018
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      Replying to @colmmacc @mdhardeman

      It sure works for me, that's a fact. Ditto for many other domains. It allows me to publish TLSA records in a downgrade-resistant manner to the rest of the world. It clearly does not work for you, but let's not get religious about it.

      1 reply 0 retweets 1 like
    7. Colm MacCárthaigh‏ @colmmacc 28 Mar 2018
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      Replying to @VDukhovni @mdhardeman

      Nope. It doesn't work, that's the truth. Once again: It doesn't protect the weakest link in the chain at all, and where it tries to, it gets the crypto wrong to the point that it's not secure. It also causes outages. None of this is a matter of opinion. There's not two sides.

      2 replies 0 retweets 0 likes
    8. Viktor Dukhovni‏ @VDukhovni 28 Mar 2018
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      Replying to @colmmacc @mdhardeman

      You say that with conviction, but that does not make it any more true. A party that can subvert DNSSEC can subvert DV cert issuance, and can typically just seize the domain. DV certs are strictly weaker. To protect a *domain* you must rely on integrity of domain control

      1 reply 0 retweets 0 likes
    9. Colm MacCárthaigh‏ @colmmacc 28 Mar 2018
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      Replying to @VDukhovni @mdhardeman

      It doesn't make it any less true either! A local attacker on a user's network can subvert DNSSEC trivially, but they can't subvert a DV cert issuance. DV cert mis-issuance due to domain spoofing is basically unheard of, but CT logs are a great improvement that really nails it.

      1 reply 0 retweets 0 likes
    10. Viktor Dukhovni‏ @VDukhovni 28 Mar 2018
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      Replying to @colmmacc @mdhardeman

      You're surely aware that the local attacker cannot break DNSSEC validation performed locally on a machine. Validation at some distant forwarder is a straw-man irrelevance. CT protection is at best after the fact, and solves Google's problem, but does little for most domains

      1 reply 0 retweets 0 likes
      Colm MacCárthaigh‏ @colmmacc 28 Mar 2018
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      Replying to @VDukhovni @mdhardeman

      Come back when local DNSSEC validation is.a thing. It's not a thing. I doubt it will ever be a thing. In the mean time: DNSSEC doesn't work, and does cause outages. Major browsers are turning on mandatory CT for everything. That's strong protection for everyone.

      11:24 PM - 28 Mar 2018
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        2. Viktor Dukhovni‏ @VDukhovni 28 Mar 2018
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          Replying to @colmmacc @mdhardeman

          Local DNSSEC validation is running on every DANE-emabled SMTP server. There are thousands of domains doing it, e.g. on the https://mailinabox.email  personal email appliance. Cisco will shortly roll out DANE support (with local validation) in their ESA product...

          1 reply 0 retweets 0 likes
        3. Colm MacCárthaigh‏ @colmmacc 28 Mar 2018
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          Replying to @VDukhovni @mdhardeman

          ... but that's not where the users are. It can still be trivially spoofed between the mail server and the user, and it can often still be forged with a bit of effort even to the SMTP server.

          1 reply 0 retweets 0 likes
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