GNU bug report logs - #25611
26.0.50; dired-do-compress unpacks .tgz files

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Package: emacs; Reported by: Mike Kupfer <mkupfer@HIDDEN>; dated Fri, 3 Feb 2017 03:51:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Subject: Re: bug#25611: 26.0.50; dired-do-compress unpacks .tgz files
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Comments from rms:

http://lists.gnu.org/r/emacs-devel/2018-11/msg00268.html

    It does not literally make sense to "decompress" an archive.  Any kind
    of archive.  That stretches the meaning of "decompress".

    Such stretching might be ok, if it led to no confusion or conflict.
    However, what we see is that it does lead to confusion.  So Z should
    not unpack archives -- not even zip archives.

    Instead, we should have a different letter for unpacking archives.
    I suggest moving dired-do-find-regexp to F
    ad defining A to unpacking an archive.




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Subject: Re: bug#25611: 26.0.50; dired-do-compress unpacks .tgz files
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Mike Kupfer wrote:

> If we do keep the extraction functionality, the docstring for
> dired-do-compress definitely needs updating.

Sorry, that should have been "docstring and prompt".

mike




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Subject: Re: bug#25611: 26.0.50; dired-do-compress unpacks .tgz files
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Glenn Morris wrote:

> [...] I do not expect a command that
> "compresses or uncompresses files" to extract a tar file. These should
> be separate steps/commands IMO. Exactly as you said in your initial
> report.

That would be my preference, too.  I'm just not sure how much of that
preference comes from mental inertia. :-) That's why my later emails
focused on the data loss and security angles.

If we do keep the extraction functionality, the docstring for
dired-do-compress definitely needs updating.

cheers,
mike




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Mike Kupfer wrote:

> It occurs to me that this could be considered a security vulnerability.

I'm not sure I agree, but regardless I do not expect a command that
"compresses or uncompresses files" to extract a tar file. These should
be separate steps/commands IMO. Exactly as you said in your initial
report.




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Hi Oleh,

Oleh Krehel wrote:

> > It occurs to me that this could be considered a security vulnerability.
> > If the .tgz file is (unintentionally) unpacked in $HOME and contains a
> > .ssh/authorized_keys, that could give an attacker access to the victim's
> > account.
> 
> The file is uncompressed into a directory with the same name. So the
> file would have to be ~/.ssh.tar.gz. If a user presses "Z" on that
> file, it's pretty clear what will happen, same as with "C" on e.g. an
> `authorized_keys' file somewhere.

That might be the intended usage, but my testing[1] shows that there's
no enforcement.  I created by hand a Desktop.tgz by doing

    tar cf Desktop.tar Desktop .ssh/known_hosts

and then compressing Desktop.tar.  (I don't use an authorized_keys file
on the system that I ran the test on.)  I moved Desktop.tgz to a temp
directory and then pressed "Z" on it.  It unpacked Desktop okay, but it
also created .ssh/known_hosts.

I also tried editing one of the files in <temp_dir>/Desktop and redoing
"Z" on Desktop.tgz.  That silently overwrote my change.

So I think two changes are needed: one to eliminate the security risk,
the second to protect against accidental data loss.

The security risk would be closed by ensuring that foo.<suffix> only
unpacks into "foo".  This could be done by checking the table of
contents of the tar file and erroring out if anything is amiss.  Another
approach would be to invoke tar as "tar xf ... foo".  The first approach
gives better feedback to the user if there is something amiss with the
tar file, but it'll take more code.  (GNU tar, at least, protects
against things like foo/../.ssh/mumble; I don't know about other
variants of tar.)

To protect against accidental data loss, I recommend erroring out if
"foo" already exists, or asking the user for confirmation before
proceeding.

regards,
mike

[1] Emacs master, changeset 18c47695 from 21 February, running on Debian
stable.




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From: Oleh Krehel <ohwoeowho@HIDDEN>
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Subject: Re: bug#25611: 26.0.50; dired-do-compress unpacks .tgz files
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Hi Mike,

> It occurs to me that this could be considered a security vulnerability.
> If the .tgz file is (unintentionally) unpacked in $HOME and contains a
> .ssh/authorized_keys, that could give an attacker access to the victim's
> account.

The file is uncompressed into a directory with the same name. So the
file would have to be ~/.ssh.tar.gz. If a user presses "Z" on that
file, it's pretty clear what will happen, same as with "C" on e.g. an
`authorized_keys' file somewhere.

regards,
Oleh




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bug#25611; Package emacs. Full text available.

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Subject: Re: bug#25611: 26.0.50; dired-do-compress unpacks .tgz files
In-Reply-To: Your message of "Fri, 03 Feb 2017 12:42:18 -0500."
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Glenn Morris wrote:

> Looks like this was added in https://debbugs.gnu.org/20384#11 ?
> I've cc'd the author of that change.

Thanks.

It occurs to me that this could be considered a security vulnerability.
If the .tgz file is (unintentionally) unpacked in $HOME and contains a
.ssh/authorized_keys, that could give an attacker access to the victim's
account.

mike




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To: Mike Kupfer <mkupfer@HIDDEN>
Subject: Re: bug#25611: 26.0.50; dired-do-compress unpacks .tgz files
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Mike Kupfer wrote:

> Suppose I have a .tar file, I move point to that file in a dired buffer,
> and I press "Z".  My file gets converted to a .tgz file.  Okay so far.
>
> If I then press "Z" again, I expect to get the original .tar file back.
> Instead, the contents of the .tar file are extracted, and the .tgz file
> is left where it was.


Looks like this was added in https://debbugs.gnu.org/20384#11 ?
I've cc'd the author of that change.


> First problem: no .tar file.
>
> Second problem: this violates the principle of Least Surprise.  The
> prompt just talked about (de)compressing the file, it didn't say
> anything about unpacking it.  (Not to mention this is a departure from
> earlier behavior of "Z", and it's different behavior than what you'd get
> with a plain old text file.)
>
> Corollary to second problem: this can overwrite the user's existing
> files, causing the user to lose data.
>
> I can see the utility of the new behavior, but I think it should either
> be non-default behavior or bound to a different character in dired.  (I
> suppose you could just fix the prompt, but you'd lose the invertibility
> of the old "Z" behavior, which seems like a step backward.)




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Suppose I have a .tar file, I move point to that file in a dired buffer,
and I press "Z".  My file gets converted to a .tgz file.  Okay so far.

If I then press "Z" again, I expect to get the original .tar file back.
Instead, the contents of the .tar file are extracted, and the .tgz file
is left where it was.

First problem: no .tar file.

Second problem: this violates the principle of Least Surprise.  The
prompt just talked about (de)compressing the file, it didn't say
anything about unpacking it.  (Not to mention this is a departure from
earlier behavior of "Z", and it's different behavior than what you'd get
with a plain old text file.)

Corollary to second problem: this can overwrite the user's existing
files, causing the user to lose data.

I can see the utility of the new behavior, but I think it should either
be non-default behavior or bound to a different character in dired.  (I
suppose you could just fix the prompt, but you'd lose the invertibility
of the old "Z" behavior, which seems like a step backward.)

In GNU Emacs 26.0.50.6 (x86_64-unknown-linux-gnu, X toolkit, Xaw scroll bars)
 of 2017-02-02 built on alto
Repository revision: 7cb7a582f44db94292709d35f4f5474f891f03b0
Windowing system distributor 'The X.Org Foundation', version 11.0.11604000
System Description:	Debian GNU/Linux 8.7 (jessie)

Recent messages:
(Shell command succeeded with no output)
Deleting...done
Move: 1 of 1
Move: 1 file
Directory has changed on disk; type g to update Dired
Quit
Type C-x 1 to delete the help window.
tar: This does not look like a tar archive
tar: office-mail-20161212.tar: Not found in archive
tar: Exiting with failure status due to previous errors

Configured using:
 'configure --prefix=/usr/new'

Configured features:
XPM JPEG TIFF GIF PNG SOUND NOTIFY GNUTLS LIBXML2 FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS LUCID X11

Important settings:
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Major mode: Dired by name

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Memory information:
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Acknowledgement sent to Mike Kupfer <mkupfer@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#25611; Package emacs. Full text available.
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