[tbb-bugs] #30237 [Applications/Tor Browser]: Tor Browser: Improve TBB UI of hidden service client authorization

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#30237: Tor Browser: Improve TBB UI of hidden service client authorization
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 Reporter:  asn                       |          Owner:  tbb-team
     Type:  defect                    |         Status:  needs_information
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  TorBrowserTeam201905      |  Actual Points:
Parent ID:  #30000                    |         Points:
 Reviewer:                            |        Sponsor:  Sponsor27-must
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Comment (by brade):

 Replying to [comment:13 antonela]:
 >
 > We talked a bit about the notification prompt, and I think it is a
 possible solution. It works per site, and the key icon is straightforward
 to identify for end-users as a password need. The downside of it is how
 confusing it is when the public key is not a password. And, as mentioned
 in [[comment:6]] prompts are usually optional. If a user cancels the
 prompt, will we render an error page? How can we allow users to recover
 from that flow to successfully add a key and access the website? ...

 I agree that the key icon is not necessarily ideal but I assume it would
 be straightforward to use our own icon for onion services.  Is changing
 the icon in the URL bar and the icon in the door hanger sufficient to set
 apart our set of prompts from login manager prompts?

 Yes, if a user cancels the prompt, they will see an error page. They will
 need to reload the page to see the prompt again (I believe there is a "Try
 again" button on the error page).

 > The primary use of the password manager notification is for saving
 passwords. Therefore, are we going to allow users to save their used key?.
 Logins in Firefox has two general settings in Preferences. The first will
 enable users to remember logins for sites, and the second allows users to
 use or not a master password. What happens if users have "Remember logins
 for sites" disabled? What happens if users are using a master password?
 >
 > Mixing private keys and passwords seems a complicated idea.
 >
 > We can still use the notification doorhanger UI, tho. We need to be
 careful about to mimic the password behavior for a different flow. We
 should consider a scenario when the input fails, or the users have
 disabled the prompts at the General Preferences. If we allow users to re-
 use their saved key, we will need a specific section at Preferences to
 manage the saved private keys.

 I'm not sure if we should mix the saving of keys with the saving of
 passwords.  Mark and I were thinking that we could provide a "Remember
 this key" checkbox in the prompt and if checked the key would be stored in
 the user's `torrc` file. Building an interface to managed stored client
 auth keys probably deserves its own ticket; I don't see us getting to that
 during this first round (before the end of June).

 > So, we have four routes for this UI implementation:
 >
 > 1. an HTTP Auth UI + custom errors
 > 2. a notification doorhanger
 > 3. a XHTML page
 > 4. a custom modal
 >
 > Which of them is more comfortable for users to understand what is the
 task there? Which of them can empower users to recover from an error?
 Which of them allow users to re-use their key? From the development
 perspective, which of these options is good enough for managing errors,
 scalable, and doable in the timeframe we have set for this scope?

 Mark and I think that options 1 and 4 will require a lot of work to
 achieve a good looking prompt and that the approach is too modal (we
 really want a prompt that is modal to the tab but not to the entire
 window).

 Option 3 will result in a prompt that is easy for a phishing site to
 spoof.

 We think we can achieve a good experience with option 2. We can prevent
 the notification prompt from disappearing until the user clicks "Cancel"
 or "Done" and we can customize the appearance as needed.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30237#comment:15>
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