this post was submitted on 22 Aug 2023
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Self-hosted captcha for matrix-synapse registrations? (mander.xyz)
submitted 1 year ago by [email protected] to c/[email protected]
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I have a self-hosted matrix-synapse server up and running on a Debian linux server, but before I open it up I want to at least get a captcha service in place to reduce spamming. The only module I've seen to handle this function appears to require setting up a Google recaptcha though, however I would prefer to keep all of this entirely self-contained for the privacy of my users. Can anyone recommend a module that allows for a local captcha option? For that matter, can anyone also recommend a captcha system that is pretty straightforward to set up (which is compatible with matrix-synapse) and uses basic preinstalled code bases like perl or python?

And while I'm here, I would also like to provide the option of registering with an email address, but I'm having trouble finding any clear how-to pages on this. Seems like that function might be built directly in to matrix-synapse but I'm just not finding anything helpful. Any suggestions?

I'm fairly new to matrix in general, but I have an initial setup running with the homeserver, Element web page, and an IRC bridge, so if I can just nail down the validation part of registrations I'll have what I think is a good starting point to launch from.

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[–] [email protected] 1 points 1 year ago (1 children)

You need to register an account on their demo page (this account gets automatically deleted after a while). And then you can create deployments, that can be embedded into other forms

[–] [email protected] 1 points 1 year ago (1 children)

I'm lost... Based on their link I expected a "demo" page, you know, something that actually shows an example of the captcha that this code is supposed to provide? I didn't even see a description of what kind of input their captcha requests from the users. It seems like I have to do a full installation just to learn something they could have provided in a single picture.

[–] [email protected] 2 points 1 year ago (1 children)

they will have to generate proof-of-work (a bunch of math that will takes time to compute) and submit it to mCaptcha.

The user doesn't have to do anything, your computer has to do the work

[–] [email protected] 1 points 1 year ago

Ooooohhhh! Well now, suddenly this sounds a lot more interesting! Thanks for that breakdown, because I completely missed the point of this one.