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Re: [Findutils-patches] xattr and capability support

From: Dale R. Worley
Subject: Re: [Findutils-patches] xattr and capability support
Date: Sat, 8 Nov 2014 19:48:10 -0500

> From: KillBoy PowerHed <address@hidden>

> Hi Dale .. extended attributes are basically key/value pairs, all
> the xattr code does currently is a simple regex match against the
> names of any extended attributes that may be present for the
> file. Capabilities are also stored as extended attributes so the
> '-cap' test isspecifically to perform a regex match against the
> value of the security.capability extended attribute if it's present.

> My initial use case was to find files that had SUID/SGID capabilities set.
> It actually didn't take long to write the PoC utilities but I'm
> happy to accept any suggestions ..

If I understand you correctly, "-xattr regex" is true if the file has
an extended attribute whose name is matched by "regex".

- Is the matching case sensitive?  (Is there any reason for it to be

- Is the nature of the regex controlled by -regextype (as is -regex)?

- If the current file name is a symbolic link, does -xattr test the
  symbolic link itself, or the file it points to?  (It's possible that
  symbolic links can never have extended attributes, in which case
  looking at the file that is pointed to would always make sense.)  Is
  this behavior affected by the -L option?  Or do we need a "-lxattr"

- Is there any way to test whether a particular attribute has a
  particular value, or matches a regex?  Is there any need for this?
  If there is:  It appears to me that the values can be binary
  strings; what do we have to do to allow comparison values to be
  specified (especially given that 0 bytes cannot appear in command
  arguments).  If the values can be binary strings, is there a need to
  provide a mask-and-test operation?

If I understand you correctly, "-cap" is true if there is an attribute
with the name "security.capability".  The third and fourth questions
in the above list apply to that.


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