XXT version 2 - Trash talking challege version ;-)

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---1062731517-1887128600-1030535739=:215259
Content-Type: TEXT/PLAIN; charset=US-ASCII

        A big thanks to all who participated in The Trash Talker Challenge
and helped me to make xxt a _much_ better piece of work. How many other
hacks like this can claim such a wide review *grin* ? My original
intention was to "call out" a few people who I thought were talent-less
loudmouths.  However, the people who contacted me about bugs or problems
both in private and on the list were very tactful and talented. Anyway I
wish to thank:

Rain Forest Puppy, Zen Parse (have fun with my 50 bucks!), Steven M.
Christey, Hank Leininger, Daniel Hartmeier, and anyone I forgot who
provided me with feedback, bugfixes, or pointed out errors in the original
release of xxt v1.

Attached is version 2.0 of xxt which has the following features and
changes over 1.0:

o Tried to mitigate race condition in -g by wiping the environment var as
  soon as it's copied. You'll be warned if you try to use -g but it will
  still work as before.

o Checked for NULL pointer when copying the environment variable data.

o Added use of O_EXCL for opening the output file.

o Fixed problem whereby the hash of the key was being reduced to 64bits
  since I was using a char array that was being populated with ascii hex
  values rather than just binary

o Moved the argv trashing loop up so that it happens before any file I/O
  thus a little more quickly. This only effects users who pass the
  keyphrase via the CLI option -k.

o Fixed an issue whereby someone may create a malicious xxt crypted file
  with a bad filesize header. Now I check to make sure the filesize jives
  with the stored header value.

o Checked for access to read & write to file in case someone is dumb
  enough to make this setuid root, also drop any permissions given to
  xxt via a SUID bit (probably superceeding the former).

o Added the -f functionality to use a whole file as the key. The file is
  hashed to a 128 bit key. This is the most secure option for providing a
  key and I would encourage it over -k or -g.

aliver

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