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So in this system is your software handling the username/password, or is the form provided by the Matrix server? Since the form asks for your homeserver, it se

So in this system is your software handling the username/password, or is the form provided by the Matrix server? Since the form asks for your homeserver, it seems like I'd be typing my password into a form controlled by you, which seems like a bad thing to train people to do? EDIT: Also, "requires no backend to function" - but if I want to use this to give users access to their data in my backend, how can I do that securely? Do I get some sort of token from their Matrix homeserver that my backend can use to ensure that the client is authenticated as the user they claim to be? Or do I need to pass the username and password to my backend so that my backend can authenticate them with their homeserver? Don't get me wrong: I love the idea and it's a cool project & great proof-of-concept. I think the current implementation is not secure enough for me to trust. It's possible that I'm mistaken and it actually is secure! But in that case I'd want to see some substantiated argument in the README, explaining how it works & why it's trustworthy.

ushakov 5y ago
yes, the form sends a POST request to your matrix server matrix indeed does have it's own login UI, which you can embed in other applications (but it is quirky)
ushakov 5y ago
> Do I get some sort of token from their Matrix homeserver correct after you sign in, you will get a token, which you can then use to authenticate against matrix home server
heftig 5y ago
The website does get your credentials. To be fair, this is how password login with any of the web clients works as well. Which makes it hazardous to use clients not hosted by the homeserver or a trusted third party. However, if the homeserver is using OIDC, the user credentials are handled entirely by the external OIDC provider and the client doesn't get them. But then you should be using OIDC directly and not "Sign in with Matrix."
- driminicus 5y ago
  We are actually working on fixing the password sending issue, see for instance https://github.com/matrix-org/matrix-doc/pull/3262 https://github.com/matrix-org/matrix-doc/pull/3262 Of course, untrusted clients can do all kinds of evil things after having authenticated. (And also clients still need the plaintext password at least client-side no matter what we do)
  - detaro 5y ago
    > (And also clients still need the plaintext password at least client-side no matter what we do) Are matrix devs seriously not aware of what OAuth is and does? That is ... concerning.
    - driminicus 5y ago
      Matrix does actually support OAuth (in fact, the mozilla.org matrix server can only be logged in to through OAuth)

ushakov 5y ago

yes, the form sends a POST request to your matrix server matrix indeed does have it's own login UI, which you can embed in other applications (but it is quirky)

ushakov 5y ago

> Do I get some sort of token from their Matrix homeserver correct after you sign in, you will get a token, which you can then use to authenticate against matrix home server

heftig 5y ago

The website does get your credentials. To be fair, this is how password login with any of the web clients works as well. Which makes it hazardous to use clients not hosted by the homeserver or a trusted third party. However, if the homeserver is using OIDC, the user credentials are handled entirely by the external OIDC provider and the client doesn't get them. But then you should be using OIDC directly and not "Sign in with Matrix."

driminicus 5y ago
We are actually working on fixing the password sending issue, see for instance https://github.com/matrix-org/matrix-doc/pull/3262 https://github.com/matrix-org/matrix-doc/pull/3262 Of course, untrusted clients can do all kinds of evil things after having authenticated. (And also clients still need the plaintext password at least client-side no matter what we do)
- detaro 5y ago
  > (And also clients still need the plaintext password at least client-side no matter what we do) Are matrix devs seriously not aware of what OAuth is and does? That is ... concerning.
  - driminicus 5y ago
    Matrix does actually support OAuth (in fact, the mozilla.org matrix server can only be logged in to through OAuth)