Prafulla Suresh

In this project, you will deploy a fully functional Hadoop cluster, ready to analyze log data in just a few minutes. You will start by launching an Amazon EMR.

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I decided to test it out myself. The $_SERVER['SCRIPT_NAME'] variable serves up the path to the requested file, even if it's an index file, and without get parameters or anything else. The PHP documentation states this contains the path of the file, but it seems to be relative to the document root, just like PHP_SELF, but without the security vulnerability.

Here is the code I used to test this: https://gist.github.com/dimo414/5484870

The output when requesting example.com/?foo=bar:

__FILE__:               /var/www/index.php"PHP_SELF:               /index.php"SCRIPT_NAME:            /index.php"REQUEST_URI:            /?foo=bar"parse_url(REQUEST_URI): /"""__FILE__:               /var/www/pathtest.php"PHP_SELF:               /index.php"SCRIPT_NAME:            /index.php"REQUEST_URI:            /?foo=bar"parse_url(REQUEST_URI): /

And the output when requesting example.com/index.php/XSS:

__FILE__:               /var/www/index.php"PHP_SELF:               /index.php/XSS # note the XSS exploit (this is bold in browser)"SCRIPT_NAME:            /index.php     # No exploit here"REQUEST_URI:            /index.php/%3Cstrong%3EXSS%3C/strong%3E"parse_url(REQUEST_URI): /index.php/%3Cstrong%3EXSS%3C/strong%3E"""__FILE__:               /var/www/pathtest.php"PHP_SELF:               /index.php/XSS"SCRIPT_NAME:            /index.php"REQUEST_URI:            /index.php/%3Cstrong%3EXSS%3C/strong%3E"parse_url(REQUEST_URI): /index.php/%3Cstrong%3EXSS%3C/strong%3E

As you can see, $_SERVER['SCRIPT_NAME'] always gives back the file that originally handled the request, i.e. the file in the URL, without any XSS risks.

You might do better to do your matrix manipulations in another language and call that code from PHP. The PHP community isn't typically concerned with matrix computation, so I imagine it will be challenging to find what you want. But there are plenty of math libraries in other languages. For example, you might try Python (SciPy), though I don't know how hard it is to mix PHP and Python. I don't know PHP, but most languages have a way to call C, and from C you could call the Gnu Scientific Library, for example.

By the way, there's hardly ever a reason to invert a matrix. Most problems that appear to require matrix inversion actually require solving linear systems. The latter is more stable. Also, some libraries may not have a matrix inversion routine per se because they assume people will use a factorization routine (e.g. Cholesky) and repeated solve systems of equations.

smtplib doesn't automatically include a From: header, so you have to put one in yourself:

message = 'From: me@example.com"Subject: [PGS]: Results""BlaBlaBla'

(In fact, smtplib doesn't include any headers automatically, but just sends the text that you give it as a raw message)

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