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    <p>In order to accurately determine what has been uploaded, you don't check for the file extension nor for the mime type sent by <strong>browser</strong>.</p> <p>On *nix environment, you've got the utility for checking the mime type of a given file, usually located in magic.mime file (/usr/share/magic.mime or something similar, depending on your setup).</p> <p>Copy/paste from the magic.mime so you see how it works in a nutshell:</p> <pre><code># Magic data for KMimeMagic (originally for file(1) command) # # Note on adding additional MIME types: # # [RFC2045,RFC2046] specifies that Content Types, Content Subtypes, Character # Sets, Access Types, and conversion values for MIME mail will be assigned and # listed by the IANA. # http://www.iana.org/assignments/media-types/ # # Any unregistered file type should be listed with a preceding x-, as in # application/x-foo (RFC2045 5.1), or a x., as in application/x.foo (RFC4288 # 4.3). Any non x-prefixed type should be registered with IANA and listed at # the above address. Any other behavior is a MIME standards violation! # # It is preferred that when a registered MIME type exists, that # the registered Content-Type and Subtype be used to refer to a file of # that type, so don't use application/x-zip when application/zip is # registered. # # If an active RFC suggests that a MIME registration for a new type is in # progress, make a note of it pointing to that RFC. # # The format is 4-5 columns: # Column #1: byte number to begin checking from, "&gt;" indicates continuation # Column #2: type of data to match # Column #3: contents of data to match # Column #4: MIME type of result # Column #5: MIME encoding of result (optional) </code></pre> <p>I'll link you with a link that'll help you in further implementation in PHP (literally 2 lines of code once you're done).</p> <p>If you can't make it work after all of this, post here in comments and I'll provide full code needed to safely detect what has been uploaded.</p> <p><a href="http://www.php.net/manual/en/book.fileinfo.php" rel="nofollow">Fileinfo</a></p>
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    1. POPHP file upload: mime or extension based verification?
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    1. COso, what's wrong if I won't use this magic? what is attack scenario?
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    2. COand, also please read the latter comment under our friend Chris' answer. that's quite interesting for you
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    3. CO@Col. Shrapnel - I didn't say anything's wrong if you don't use it. I've been using this method for quite some time and I never, ever had issues with receiving wrong mime type if I changed the file extension. If someone wants to go with file ext. / browser reported mime type detection - go ahead, it really won't bother me in the end :) just sharing my experience and methods used.
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