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Should you allow username to use Apostrophe (aka quotes ) (programming.dev)

submitted 9 months ago by Rick_C137@programming.dev to c/webdev@programming.dev

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Hi,

For websites I've always restricted username to use Apostrophe ' and " and some times even space . If a website necessitate special character then I prefer to create an additional DB field ~DisplayName.

It's easier to forbid the use of Apostrophe, otherwise you will have to escape also your search query to match what has been recorded in the DB.

On the topic I've this https://security.stackexchange.com/questions/202902/is-single-quote-filtering-nonsense

But if you have better documentation feel free to share :)

Thanks

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[–] nous@programming.dev 25 points 9 months ago* (last edited 9 months ago) (3 children)

Any field in a DB can be vulnerable to SQL injection. Filtering out characters is a terrible way to mitigate that attack, you should be using prepared queries where it does not matter what chars you have in your username or password. You should never form a query with string concatenation.

You may want to limit chars in a username to ones allowed in URLs (or even ones that don't need escaping) if you ever want it to appear in a URL though. Or any other places the user name might be used, but a entry in a DB should not matter.

[–] peter 3 points 9 months ago (1 children)

Another good reason to filter characters is based on what people expect. You don't want people to be making accounts like OfficialSiteSupport'

[–] damium@programming.dev 2 points 9 months ago

There are a lot of edge case characters around visually indistinguishable names. If that is a concern usernames should use a restricted known character sets instead of trying to block specific characters. You likely should also treat lookalike characters as equivalents when checking for username overlap.

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