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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Rich Felker‏ @RichFelker Apr 2
      Replying to @vavrusam @Cloudflare and

      No, still trying to figure out why they're doing this. But the wildcard HINFO is visible w/o an any query.

      1 reply 0 retweets 0 likes
    2. Rich Felker‏ @RichFelker Apr 2
      Replying to @RichFelker @vavrusam and

      For example, host -t 13 http://foo.cloudflare.com  http://ns3.cloudflare.com 

      1 reply 0 retweets 0 likes
    3. Marek Vavrusa‏ @vavrusam Apr 2
      Replying to @RichFelker @Cloudflare and

      That's not an injection, it returns a NODATA answer.

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker Apr 2
      Replying to @vavrusam @Cloudflare and

      For type HINFO it's not NODATA, it's an empty (1-byte nul) HINFO RR.

      2 replies 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker Apr 2
      Replying to @RichFelker @vavrusam and

      The presence of the wildcard HINFO is why requests for other RR types yield NODATA rather than NxDomain.

      1 reply 0 retweets 0 likes
    6. Marek Vavrusa‏ @vavrusam Apr 2
      Replying to @RichFelker @Cloudflare and

      No, NODATA means that the name maybe exists, but the requested type for that name does not. It doesn't say anything about a wildcard. You can add DO=1 in the query and read the covered types (or proof of wildcard expansion) from the NSEC record.

      1 reply 0 retweets 0 likes
    7. Rich Felker‏ @RichFelker Apr 2
      Replying to @vavrusam @Cloudflare and

      The underlying problem is that @Cloudflare is returning NODATA for subdomains that don't exist (that the customer didn't intend to exist) rather than NxDomain.

      1 reply 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker Apr 2
      Replying to @RichFelker @vavrusam and

      I thought I'd diagnosed synthesized wildcard RRs as the mechanism but it seems they may just be an artifact of any-deprecation & my misreading.

      1 reply 0 retweets 0 likes
    9. Filippo Valsorda‏Verified account @FiloSottile Apr 3
      Replying to @RichFelker @vavrusam and

      My bad. But really, DNSSEC’s bad, and it was an intentional trade-off: https://tools.ietf.org/html/draft-valsorda-dnsop-black-lies-00 …

      1 reply 1 retweet 1 like
    10. Rich Felker‏ @RichFelker Apr 3
      Replying to @FiloSottile @vavrusam and

      Does Cloudflare have any proposal for how their results should be interpreted/how clients should distinguish between nonexistent domains and domains that just lack a specific record type?

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker Apr 3
      Replying to @RichFelker @FiloSottile and

      Making this distinction is necessary for search domain functionality to work in a consistent manner (i.e. getting data for the same search path component independent of RR type requested).

      11:10 AM - 3 Apr 2018
      • 1 Like
      • Andrew Ayer
      2 replies 0 retweets 1 like
        1. New conversation
        2. Marek Vavrusa‏ @vavrusam Apr 9
          Replying to @RichFelker @FiloSottile and

          This should be now fixed, can you check on any affected zone? cc @odintsov_pavel

          1 reply 0 retweets 2 likes
        3. Rich Felker‏ @RichFelker Apr 9
          Replying to @vavrusam @FiloSottile and

          Tried http://foo.cloudflare.com , seems fixed when querying http://ns3.cloudflare.com  directly, but not yet propagated everywhere. Thanks!

          1 reply 0 retweets 1 like
        4. Pavel Odintsov‏ @odintsov_pavel Apr 9
          Replying to @RichFelker @vavrusam and

          Awesome! We finished deployment for NODATA/NXDOMAIN fix few hours ago and it should be everywhere now.

          0 replies 1 retweet 2 likes
        5. End of conversation
        1. New conversation
        2. Marek Vavrusa‏ @vavrusam Apr 3
          Replying to @RichFelker @FiloSottile and

          The proposal is to return NXDOMAIN when it's appropriate. For most cases it doesn't matter (the data either exists or not), but in some cases (like search path expansion), the distinction indeed matters. It should go out in the next release or two.

          1 reply 1 retweet 5 likes
        3. Marek Vavrusa‏ @vavrusam Apr 3
          Replying to @vavrusam @RichFelker and

          Right now you can ask for an NSEC in signed zones to check. If it covers only itself and a signature, the name doesn't really exist.

          0 replies 0 retweets 0 likes
        4. End of conversation

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