Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
It depends entirely on the application. We don't know what "unsafe" is without knowing the context. If you're talking about shell meta-characters, it depends on which shell you're using (and which shell the user will be using), and should be relatively moot if you use the multiple-argument form of calls like system and exec, which wouldn't do any shell expansion anyway. If you're talking about unsafe text in HTML, we have things like HTML::Entities.

Basically, identify what you're going to be doing with the data, and then figure out how you're going to ensure that this untrusted data is safe.

And no matter how you approach it, don't think of your algorithm as being built to remove bad things. Build it to permit safe things. If this means doing a tr/a-zA-Z0-9_-//cd, then that's what you have to do.

In reply to Re: Untainting safely. (b0iler proofing?) by Fastolfe
in thread Untainting safely. (b0iler proofing?) by BrowserUk

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others cooling their heels in the Monastery: (3)
As of 2024-04-24 22:09 GMT
Find Nodes?
    Voting Booth?

    No recent polls found