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Dropbox Is Probably Not Stealing Your Files

one.darrenpmeyer.com

51–60 of 105 posts

Re: Dropbox Is Probably Not Stealing Your Files

#51

"This is, by necessity, a system-wide process." This is, by design, a fucking huge defect of the underlying system calls. Give the OS a list of folders to watch. Dropbox should not even get a callback for a file it's not is supposed to watch.

You can constrain filesystem callbacks on Windows, I have no idea why Dropbox doesn't.

Re: Dropbox Is Probably Not Stealing Your Files

#52
post #4

This is a fine post, but all I can think about this situation is "or, you could just reverse the Dropbox client and find out for sure". Speculation about Dropbox stealing files seems premised on the idea that you can't know what the client is doing. But that's not even close to true. People reverse much, much harder targets than Dropbox for fun. If any version of Dropbox published to its user base ever did anything l…

I would be very surprised if a workplace name like Dropbox has never been reverse engineered by a bored hacker on a lazy weekend. Surprised and disappointed.

I used gdb to talk the Dropbox client into opening a repl.

For examples see pyrasite, code.interact, etc.

If you specifically want to know what files Dropbox reads there are easy ways to observe this, like strace.

Re: Dropbox Is Probably Not Stealing Your Files

#53
post #4

This is a fine post, but all I can think about this situation is "or, you could just reverse the Dropbox client and find out for sure". Speculation about Dropbox stealing files seems premised on the idea that you can't know what the client is doing. But that's not even close to true. People reverse much, much harder targets than Dropbox for fun. If any version of Dropbox published to its user base ever did anything l…

What happens here is that Windows Explorer asks Dropbox whether it should display a green or blue icon for a file. It does this for all files, including those outside of the Dropbox folder.

Full analysis here: https://news.ycombinator.com/item?id=9139657

Re: Dropbox Is Probably Not Stealing Your Files

#54
post #39

Read their TOS and compare it to Google Drive's TOS. The insane rights the Google TOS grants to Google are why it costs ~ 1/2 as much. It is also an indicator that Dropbox is less shady. They don't grant themselves rights to do anything with your data outside of the normal things you need them to do to offer the dropbox service for your use. Unlike Google, which could for instance, use your personal photos of your ki…

I think you're misunderstanding the TOS. I do not think Google is subsidizing their storage costs by abusing your private photos.

Re: Dropbox Is Probably Not Stealing Your Files

#55
post #14
post #8

Earlier quoted context omitted.

To calculate the hash, it needs to read the whole file, which this post claims it isn't doing.

Not really, one could get a unique enough hash by reading the first lets say 10,000 bytes of each file, and it would be faster than hashing the whole file edit: here i was bored enough > http://pastebin.com/NJEvnG1d

I wrote something that was hashing audiobook files that was taking forever, so I tried using the first N bytes (likely much more than 10kB), but soon found that for any given audiobook, each chapter's MP3 had a large identical header on the front end - I imagine that it was a cover image embedded in the metadata.

I think in the end I just started taking the data from the end of the file, but if you're going with subsets, it's probably better to use a pseudo-randomly selected subset rather than a sequential subset. It doesn't have to be a different pseudo-random subset for each file, but I imagine there's an ideal noise profile in the sampling (maybe white noise is best).

Re: Dropbox Is Probably Not Stealing Your Files

#56
post #32
post #24

Earlier quoted context omitted.

[deleted]

Dropbox for Linux runs just fine as a user-mode program. Besides, Dropbox does much nastier stuff than look at your files; it bloody hooks into your shell (Finder/Explorer) and manipulates the icons. It could decide to replace an .exe icon with the icon for a Word Document, for example.

Thought they just used icon overlays, much like all other status-icon shell extensions such as version control (TortoiseSVN). Not exactly some low level windows hack, it's a plugin system in Explorer. I probably have five or six such icon overlay extensions on my machine.

Re: Dropbox Is Probably Not Stealing Your Files

#57
post #54
post #39

Read their TOS and compare it to Google Drive's TOS. The insane rights the Google TOS grants to Google are why it costs ~ 1/2 as much. It is also an indicator that Dropbox is less shady. They don't grant themselves rights to do anything with your data outside of the normal things you need them to do to offer the dropbox service for your use. Unlike Google, which could for instance, use your personal photos of your ki…

I think you're misunderstanding the TOS. I do not think Google is subsidizing their storage costs by abusing your private photos.

They might not be doing it (and probably aren't), but they do have the right.

Re: Dropbox Is Probably Not Stealing Your Files

#58

The cycle of security is this: 1. Security experts see a security hole and note that it could only be used by a widely trusted company or government. 2. People note that it's also possible that it's not happening, and claim that the widely trusted company or government would never use the security hole. 3. It is discovered that the widely trusted company or government has been using the security hole.

"Touches files it doesn't have to" is not a security hole.

Re: Dropbox Is Probably Not Stealing Your Files

#59
post #39

Read their TOS and compare it to Google Drive's TOS. The insane rights the Google TOS grants to Google are why it costs ~ 1/2 as much. It is also an indicator that Dropbox is less shady. They don't grant themselves rights to do anything with your data outside of the normal things you need them to do to offer the dropbox service for your use. Unlike Google, which could for instance, use your personal photos of your ki…

We all know that the reason Google is running face recognition and photo recognition software on your all your files is to cross reference it with databases of paedophilia and terrorism !

Re: Dropbox Is Probably Not Stealing Your Files

#60

The cycle of security is this: 1. Security experts see a security hole and note that it could only be used by a widely trusted company or government. 2. People note that it's also possible that it's not happening, and claim that the widely trusted company or government would never use the security hole. 3. It is discovered that the widely trusted company or government has been using the security hole.

"Touches files it doesn't have to" is not a security hole.

"Users install program that touches files the users might not want it to" is a security hole. The unknown is whether Dropbox comes with malware which takes advantage of that security hole.
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