[Cyberduck-trac] [Cyberduck] #7573: Separate dialog for keyboard-interactive prompts
trac at trac.cyberduck.io
Thu Nov 28 19:04:46 UTC 2013
#7573: Separate dialog for keyboard-interactive prompts
Reporter: samukallio | Owner: dkocher
Type: enhancement | Status: new
Priority: low | Milestone:
Component: sftp | Version: 4.4
Severity: normal | Resolution:
Keywords: | Architecture:
Comment (by samukallio):
The most straightforward solution would be to bring up a dialog for each
prompt in turn, containing the prompt message and a single input field for
the answer. The input field would be a regular text field or a password
field depending on the "echo" flag for that prompt. I've attached a
screenshot showing how this is implemented in WinSCP. Here, "#AC login:"
is the prompt message and the field is a regular text field (echo on).
Generally speaking, it's not possible for a client application to know for
sure the meaning of any prompt, because the challenge-response
authentication method can't convey any metadata about them. Still, if the
server is simply doing normal password authentication using challenge-
response, sending a simple "Password:" prompt, it's probably safe to
assume that is the password. Currently, Cyberduck assumes that the first
prompt is always the password prompt regardless of the message or value of
the echo flag.
Here is how I would implement this:
- If this is the first prompt, echo=off and the message is "Password:",
assume it's asking for the user's password. Supply the value from the
standard user/password dialog (or automatically, if the user chose
remember password). If that is all the server wants, then the user doesn't
have to deal with the challenge/response prompt dialog.
- If this is the first prompt, but the prompt it something else, then
don't assume anything and just present the user with the
challenge/response dialog. Don't record the answer anywhere (as in
"remember password"), since it's not really possible to say if this is a
one-time value (e.g. google authenticator code) or not.
- For all the rest of the prompts, present the challenge/response dialog.
Note that if a "Password:" prompt comes in after the first prompt, it
might not correspond the password for the SSH user. This is the case for
the service depicted in the screenshot, where it first asks the user for
his e-mail address, and then for a password corresponding to that e-mail
address (not the SSH user).
Ticket URL: <https://trac.cyberduck.io/ticket/7573#comment:2>
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