~As far as I know, bucket names are public via certificate transparency logs.~ There are tools for collecting those names. Besides you'd leak the subdomain to (typically) unencrypted DNS when you do a lookup and maybe via SNI.

Edit: crossout incorrect info

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BCM43 2 hours ago | parent | next [-]

I'm pretty sure buckets use star certs and thus the individual bucket names won't be in the transparency logs.

	▲	8organicbits 2 hours ago \| parent [-]
		Ah you're right, they are always wildcard certs. I think I was mis-remembering https://news.ycombinator.com/item?id=15826906, which guesses names based on CT logs. In either case, the subdomain you use in DNS requests are not private. Attackers can collect those from passive DNS logs or in other ways.

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embedding-shape 2 hours ago | parent | prev [-]

> Besides you'd leak the subdomain to (typically) unencrypted DNS when you do a lookup and maybe via SNI.

"Leak" is maybe a bit over-exaggerated, although if someone MitM'd you they definitely be able to see it. But "leak" makes it seem like it's broadcasted somehow, which obviously it isn't.

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8organicbits an hour ago | parent [-]

No man-in-the-middle is needed, DNS queries are often collected into large datasets which can be analyzed by threat hunters or attackers. Check out passive DNS https://www.spamhaus.com/resource-center/what-is-passive-dns...

You'd need to check the privacy policy of your DNS provider to know if they share the data with anyone else. I've commonly seen source IP address consider as PII, but not the content of the query. Cloudflare's DNS, for example, shares queries with APNIC for research purposes. https://developers.cloudflare.com/1.1.1.1/privacy/public-dns... Other providers share much more broadly.

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embedding-shape an hour ago | parent [-]

> No man-in-the-middle is needed [...] Check out passive DNS

How does one execute this "passive DNS" without quite literally being on the receiving end, or at least sitting in-between the sending and receiving end? You're quite literally describing what I'm saying, which makes it less of a "leak" and more like "others might collect your data, even your ISP", which I'd say would be accurate than "your DNS leaks".

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8organicbits an hour ago | parent [-]

There's a lot of online documentation about passive DNS. Here's one example

> Passive DNS is a historical database of how domains have resolved to IP addresses over time, collected from recursive DNS servers around the world. It has been an industry-standard tool for more than a decade.

> Spamhaus’ Passive DNS cluster handles more than 200 million DNS records per hour and stores hundreds of billions of records per month, providing you with access to a vast lake of threat intelligence data.

https://www.spamhaus.com/resource-center/what-is-passive-dns...

	▲	embedding-shape 25 minutes ago \| parent [-]
		> collected from recursive DNS servers around the world Yes, of course, because those DNS servers are literally receiving the queries, eg "receiving the data". Again, there is nothing "leaking" here, that's like saying you leak what HTTP path you're requesting to a server, when you're sending a HTTP request to that server. Of course, that's how the protocol works!