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4499 posts

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#257464 4-Oct-2019 14:32
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Kia ora team, just a general question for the developer types out there.


We have a little custom calendar 'app' we use to manage our civil teams who aren't, obviously, office-bound with easy PC access. It's HTML (with bootstrap for styling/responsiveness) with a PHP & MySQL back-end. The whole thing is behind a log-in.


I'm knocking together a basic web form they can use for near miss reporting so they can just jump on their phones and fill this out. I'd like to include a file upload field so they can take a photo and upload if required. I just wanted to sound off what I plan on doing and see if it's the "right" thing to do....


- User submit forms
- PHP to check file type, and if it's actually an image (apparently getimagesize() can be used to do that?)
- If file OK, rename with a unique ID (to avoid conflicting file names) and dump in to a folder in the web directory
- Create a DB entry (probably just do a separate table for them i guess?) with the UID/filename, and other appropriate info to index against the correct 'near miss report'


From there a "manager" will just get a notification a new report has been submitted, and they can jump on to a view a list of the reports and export a PDF of the report if required - hence the need to store the image.


Does that all sound OK? Anything else I should verify before letting the file to be uploaded to the script?


This isn't a "mission critical" type application. It runs on a VM that gets backed up daily, so I'm not overly concerned with security, but also don't want the pain of having to rebuild it just because of some dodgy file upload.

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  #2329652 4-Oct-2019 14:45
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You should make sure its not possible to execute PHP and other script languages in the folder you store the images.


I would also make sure that its not easy to go through the images, thats to say that you don´t store them as imageID.jpg (thats to say, image01.jpg, image02.jpg etc). If its easy to increase the number and find the attachments that might be a problem in that the images would be easily available for people that shouldn´t see them.




This discussion on Stackoverflow seems a good one on the topic.

BDFL - Memuneh
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  #2329667 4-Oct-2019 15:34
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4499 posts

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  #2329686 4-Oct-2019 16:49
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That Stackoverflow link is excellent!


Looks like I had the right idea. Didn't think about using htaccess to stop PHP running in that folder - great plan. Now also understand how getimagesize can work too.

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