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The send a report, wait for some time, and receive a response pattern is
used in many places already and more are to come. In fact, no send
should ever happen without the wait for a response.
To that end, this change introduces a new 'transmit' function that
performs the exactly this task: send a report and return the response to
it.
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It is possible that sending or receiving a feature report fails. Such
failures can have multiple reasons, including transient problems. In the
case of such a transient failure we should retry the operation.
This change accomplishes this feat by retrying a send in case of a
failure up to a maximum of three times, with a small wait in between. It
also introduces the logic or receiving a response (which is not yet
evaluated fully).
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By just sending a command to the nitrokey alone we have no idea of what
actually happened on the side of the nitrokey. A command could simply be
invalid in the current context or the stick could be busy or in a
failure state.
In order to determine the success of an operation, this change adds the
logic to retrieve the response from the nitrokey as well.
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Commands to the nitrokey all must follow a similar pattern in that they
all require to have a constructor (i.e., a new() method) and need to
implement the AsRef trait for byte slices.
For we require more commands in the future, this change introduces
macros that simplify creation of command objects.
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With this change we assemble a HID feature report and send it to the
nitrokey device. Feature reports are the objects used for sending
commands to the nitrokey. We create two different reports for
opening and closing of the encrypted volume.
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The 'hid' crate got a couple of bug fixes, at least one of which we
require in order to retrieve HID feature reports correctly.
This patch imports the new state and bumps up the library version used.
Import subrepo hid/:hid at 52b47d78c17b876194e4b4a1c0c8ae8adfb3d39c
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We do not want to roll our own infrastructure for entering a password
(or PIN) securely, as there are existing providers of such
functionality. gpg-agent, which uses pinentry for this very purpose, is
such a program and we can safely assume to be present because we use it
with the smartcard part of the nitrokey.
This change introduces a new module, pinentry.rs, that provides the
means to invoke gpg-agent to ask the user for a PIN and to parse the
result. Using gpg-agent like this has two advantages that other
solutions do not necessarily provide: first, because we use gpg-agent
anyway it's pinentry configuration is as the user desires it and, hence,
the integration appears seamless. And second, the agent caches
pass phrases which alleviates the need for repeated entry should the
credential be required again.
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This change uses the 'hid' crate to discover and open the Nitrokey
Storage device. 'hid' is a wrapper around libhidapi (its libusb back-end
in particular).
Being a command line application some sort of parameter handling needs
to happen. The approach we take is very simple for now to minimize the
number of dependencies: we just compare the first argument against the
expected ones and raise an error if no match was found. Because we only
have positional arguments right now this is all we need.
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ec441b2751dcbbcd053800b6901672c999651584
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a493b0d7c93df68c94d1bad2a1f419389e52c0f5
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This change adds the basic scaffolding for the nitrocli application. The
scaffolding was created using the following command:
$ cargo new --bin nitrocli
The application aims at providing a command line interface for the
Nitrokey Storage device.
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