Re: [dispatch] Proposal for scantxt; scanning opt-in/out, identification, verification, notification, and reporting

John R Levine <johnl@taugh.com> Sun, 04 December 2022 20:41 UTC

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Date: Sun, 04 Dec 2022 15:41:13 -0500
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From: John R Levine <johnl@taugh.com>
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Subject: Re: [dispatch] Proposal for scantxt; scanning opt-in/out, identification, verification, notification, and reporting
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Anyway, I think we've hammered on this topic enough.  Let's see if there 
is interest from people who might want to implement something.

On Sun, 4 Dec 2022, John R Levine wrote:

>> I consider allowing/identifying via IP to be quite dated, prone to spoofing 
>> and network attacks (BGP hijacking) and requires effort to maintain and 
>> make people aware of the source IPs (and I'd argue IPv6 adoption makes it 
>> harder).
>> Adding a token of some sort makes the source IP agnostic ...
>
> If you're going to do that, please explain how you plan to add a token to 
> SMTP, FTP, Telnet, SSH, SMB, and the RPC that NFS uses, and persuade people 
> to update their dusty servers to look for the token.  If you're just scanning 
> http and https, we have robots.txt for that.
>
>> That said, I do suggest a standard way to indirectly identify via IP:
>> Source IP -> PTR "_scanner.*" (where this also has the "scanner" TXT 
>> record) -> A/AAAA of Source IP
>
> Even with a static IP, getting PTR records installed is hard, getting PTR 
> records that don't mirror A records is harder, and the amount of rDNS that is 
> DNSSEC signed to make it spoof resistant rounds to zero.  This continues to 
> be very unrealistic.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly