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Just take the string as bytes and hash it ffs
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this post was submitted on 26 Aug 2024
461 points (95.5% liked)
Mildly Infuriating
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There’s a special place in hell for those who set an upper limit in password lengths.
I sort of get it. You don't want to allow the entire work of Shakespeare in the text field, even if your database can handle it.
16 characters is too low. I'd say a good upper limit would be 100, maybe 255 if you're feeling generous.
The problem is that you (hopefully) hash the passwords, so they all end up with the same length.
At minimum you need to limit the request size to avoid DOS attacks and such. But obviously that would be a much larger limit than anyone would use for a password.
Also rate of the requests. A normal user isn't sending a 1 MiB password every second
What's a sensible limit. 128 bytes? Maybe 64?
I'd say 128 is understandable, but something like 256 or higher should be the limit. 64, however, is already bellow my default in bitwarden
The eBay password limit is 256 characters.
They made the mistake of mentioning this when I went to change my password.
Guess how many characters my eBay password has?
-1?
Damn signed bytes!
Just paste it in here and I count the characters for you.
69
You don't store the original text. You store the hash of it. If you SHA512 it, anything that's ever given in the password field will always be 64Bytes.
The only "legit" reason to restrict input to 16 character is if you're using an encryption mechanism that just doesn't support more characters as an input. However, if that's the case, that's a site I wouldn't want to use to begin with if at all possible.
The resulting hash will always be the same size, but you don't want to have an unlimited upper bound otherwise I'm using a 25GB blueray rip as my password and your service is going to have to calculate the hash of that whenever I login.
Sensible upper bounds are a must to provide a reliable service not open to DDOS exploits.
Even 255 bytes with 10 million entries is only ~2.6GB of data you need to store, and if you have 10 million users the probably $1 a month extra that would cost is perfectly fine.
I suppose there may be a performance impact too since you have to read more data to check the hash, but servers are so fast now it doesn't seem like that would be significant unless your backend was poorly made.
Yeah but what if I have one user with 9.9 million accounts? That bastard
Account georg
Oh and also, "change this every four weeks please."
Okay then. NEW PASSWORD: pa$$word_Aug24
Invalid password, maximum 13 characters.
pa$$word0824
Only a maximum of 3 digits allowed
Yep. Having to have requirements that doesn't flow with people very well and requiring constant updates, people WILL find shortcuts. In the office, I've seen sheets of paper with the password written down, I've seen sticky notes, I've seen people put them in notepad/word so they could just copy paste.
This is made worse, because you have to go out of your way for a password manager, which means you need to know what that is. And you need a good one because there has been (and I'm going to generalize here) problems with some password managers in the past. And for work, they have to allow a password manager for that to even be an option. Which you then end up with this security theater.
coughLastPasscough
“Problems”. What an delightfully understated term to use.
the password cannot contains the same sequences of characters as the old password.
and i have seen this requirement in a service that requires changing it every month for some reasons.
and this is to manage a government digital identity that allows to log it in all governments websites.
Reasonable upper limits are OK. But FFS, the limit should be enough to have a passphrase with 4 or 5 words in it.
Usually 256 bit hash is used. 256 bits is 32 bytes or 32 characters. Of course you are losing some entropy because character set is limited, but 32 characters is beyond reasonable anyway.
The eff passphrase generator has about 2.5 bits of entropy per character (without word separators). Eff recommends 6 word passphrases, and with an avg word length of 7, that's (only) 79.45 bits of entropy that won't even fit in the 32 characters. If there wasn't a password length limit it would be possible to saturate the hash entropy with a 20+ word & 102+ char passphrase.
I'd be totally fine woth 32 characters! But I've come across too many websites with unreasonably short (20 characters or less) limits.
Just opened a PayPal account and their limit is 20. Plus the only 2fa option is sms 🙃.
I just double checked and I have TOTP enabled for my PayPal account so it should be an option.
I just found this support article of theirs and it says it can only be enabled through their website and not through the app (why?!) so you might be running into that?
https://www.paypal.com/uk/cshelp/article/what-is-2-step-verification-and-how-do-i-turn-it-on-or-off-help167
Probably people would struggle to scan the QR Code with their smartphone. I think most apps can scan it from a image but obviously this would be unsafe, especially when people sync their screenshot to the cloud.
I can 100% confirm totp exist for PayPal, because I'm using it.
That last part definitely isn't true.
"Your password needs to be less than 65k characters long" >:(
Darn, can't use the entire Bee Movie on Blu-Ray as my password then.
Basically guaranteed to be a clear text offender