Make QR code for TOTP more specific, informative

[brainwane]

What's the problem this feature will solve?
The QR code (for Duo Mobile, at least) produces an entry with just the username, which is ambiguous to the user.

Describe the solution you'd like
More helpful would be, e.g., test.pypi.org-$username to show which PyPI (and really which site) the account is for, AND which account it is.

Additional context
Submitted at the PyCon North America sprints by signop who is probably @signop; thank you for testing!

cc @steiza

[brainwane]

@di @woodruffw If this is easy, let's try to get it in before we wrap up the OTF milestone?

[signop]

Just confirming over here too that #5809 is the same thing I was after with my request. Thanks all!

[woodruffw]

Hmm, so this is how we're generating the TOTP provisioning URI:

otp.generate_totp_provisioning_uri(
    totp_secret,
    self.request.user.username,
    issuer_name=self.request.registry.settings["site.name"],
)

Which yields a URI like this:

otpauth://totp/Warehouse:foobar?digits=6&secret=TOTP_SECRET_HERE&algorithm=SHA1&issuer=Warehouse&period=30

So, TOTP applications should have enough information to unambiguously identify (Warehouse, username) tuples. For example, this is what I get with Google Authenticator:

Whereas for Duo:

Fixing this is a bit of a double-edged sword: we could change the otpauth username field to something like Warehouse-$username, but that would probably lead to some confusing presentations on TOTP applications that parse the otpauth:// scheme correctly (like Google Authenticator and FreeOTP).

Edit: For reference: https://github.com/google/google-authenticator/wiki/Key-Uri-Format

[woodruffw]

Somewhat related: we can change the issuer name from site.name to warehouse.domain/request.domain to present to the user as "pypi.org" or "test.pypi.org" instead of just "Warehouse". But that doesn't improve things for TOTP applications that don't respect the issuer name/parameter.

[brainwane]

@steiza do I recall correctly that there's an update on the Duo Mobile side that partially addresses this issue?

[steiza]

Oops! Sorry, I'm not sure how I missed this back in May.

I haven't worked on the mobile app, but my understanding is that if the URI contains issuer=PyPI (as https://pypi.org currently does), then it will show up in Duo Mobile with:

• the PyPI logo
• the first line will read "PYPI" (sorry for the capitalization - the first line in the Duo Mobile app is always all uppercase)
• the second line will be the username

If the issuer is set to any other value, like TestPyPI (as http://test.pypi.org did when I last tested it), or Warehouse, then the first line will read "THIRD-PARTY" and there won't be a logo.

This isn't ideal, but it shouldn't be confusing to users of pypi.org. I can definitely see how this would be confusing to users of test.pypi.org.