As a follow up to an earlier question that attracted a whole zero answers, I'm wondering about the possibilities of allowing a web server (apache) to write to its own document root (Linux), in order to dynamically create meta-redirect files.
Of course, this sounds incredibly dangerous, and I'm wary of going the whole hog and granting the web-server user full write-access to its own docroot. Is there a more appropriate way of achieving this?
What's usually done is to allow writes only to subdirectories, hopefully located in a noexec mounted partition.
That said, it seems to me that you should just create a set of RewriteMap directives to do your dynamic redirection, there's no need to write files in the document root to accomplish that.
I answered similarly in the other question, just for completeness.
This is incredibly dangerous if you are trying to achieve what your previous question was getting at.
If you are going to go this route, you'll want a ton of testing to prevent people from forcing webserver instructions into htaccess files.
Use mod-rewrite, mapping to a program that you write to do the rewrites based on database records or some other mechanism.
Instructions here:
http://httpd.apache.org/docs/1.3/mod/mod_rewrite.html
Look for: "External Rewriting Program" on the page
Edit (from Vinko in the comments, 2.2 docs)
http://httpd.apache.org/docs/2.2/mod/mod_rewrite.html#rewritemap