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Preparing the upload folder

From: Uploading Files Securely with PHP

Video: Preparing the upload folder

When creating the upload folder or directory on your remote server, If you're on a Windows server, check with the Server Administrator.

Preparing the upload folder

When creating the upload folder or directory on your remote server, there are a couple of considerations you need to bear in mind. First, you need to set the right permissions. The web server needs to be able to write to the folder. Most PHP sites are hosted on Linux servers. From the security viewpoint, permissions should be as restrictive as possible. Start by trying seven, five, five. Seven gives the owner read, write and execute permissions.

Setting the other two values to five prevents anyone else from writing to the folder. But they can read files and access sub folders. In most cases this should be sufficient. However if that doesn't work, try seven, seven, five. This gives the group read, write and execute permissions, but prevents global users from writing. If you're on a Windows server, check with the Server Administrator. The other important consideration is where you put the folder. If you put it inside the server root, uploaded files will be immediately accessible to anyone.

If the upload form is password protected and you can trust everyone who will be uploading files, that's probably okay. But you're on much safer ground, if you store uploaded files outside the server route. If the files are going to be displayed on your site, it gives you chance to inspect them to make sure they don't contain malicious or obscene content. In this course, we'll be testing upload scripts locally. To keep things simple, I'll be creating the upload folder inside the testing site root.

But you can choose wherever you like. If you're using Linux in your local testing environment, chmod the upload folder to 755 or 775. On Windows, just create the upload folder, you don't need to set any special permissions. However, on Mac OS 10 you need to give read and write permissions on the upload folder. For the benefit of Mac users, let me quickly show you how to do that. Windows and Linux users can skip the rest of this video.

I'm using MAMP on my Mac, So that site is in Applications>MAMP>htdocs>uploads. Now, I need to create a folder for the upload files. Create a new folder, if necessary insert your Mac administrative password. And then rename the folder, I'm going to call it uploaded, wants my password again. And then once you've created the folder press Cmd+I to bring up a get info pane.

If necessary, expand sharing and permissions at the bottom and then click the padlock icon to make some changes. Again, you need to put in your password and then change everyone. Change the privilege to read and write, then you can click the padlock icon. To prevent further changes being made and close the Get Info panel. And that's it. You're now ready to complete the basic upload script.

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This video is part of

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Uploading Files Securely with PHP

33 video lessons · 2244 viewers

David Powers
Author

 
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  1. 4m 49s
    1. Welcome
      57s
    2. What you should know before watching this course
      2m 0s
    3. Using the exercise files
      1m 52s
  2. 33m 2s
    1. How PHP handles file uploads
      6m 16s
    2. Examining the $_FILES array
      5m 8s
    3. Setting the maximum file size
      5m 36s
    4. Preparing the upload folder
      3m 18s
    5. Moving the file to its destination
      6m 51s
    6. Limitations on file uploads
      5m 53s
  3. 47m 3s
    1. Planning the class's features
      3m 15s
    2. Creating and using a namespaced class
      5m 25s
    3. Creating the class constructor
      7m 26s
    4. Getting a reference to the uploaded file
      5m 9s
    5. Checking the error level
      5m 7s
    6. Displaying errors and other messages
      4m 51s
    7. Setting and checking the maximum file size
      7m 19s
    8. Strengthening the setMaxSize() method
      8m 31s
  4. 35m 30s
    1. Restricting acceptable MIME types
      5m 27s
    2. Removing spaces from file names
      5m 21s
    3. Restricting acceptable file-name extensions
      6m 10s
    4. Neutralizing potentially dangerous uploads
      5m 54s
    5. Renaming files with duplicate names
      7m 58s
    6. Moving the file to its destination
      4m 40s
  5. 10m 25s
    1. Understanding how the $_FILES array handles multiple files
      4m 42s
    2. Adapting the class to handle both single and multiple uploads
      5m 43s
  6. 38m 15s
    1. Overview of the UploadFile class
      5m 9s
    2. Setting up to use the class
      4m 11s
    3. Using the class
      8m 12s
    4. Reporting errors with multiple uploads
      4m 0s
    5. Displaying the server limits
      4m 51s
    6. Alerting the user about exceeding the server limits
      6m 14s
    7. Changing the class's defaults
      5m 38s
  7. 1m 38s
    1. Goodbye
      1m 38s

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