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This patch removes the raw hidapi implementation of the status command
and all utility methods that are no longer needed. With this patch, all
device communication is performed using libnitrokey.
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This patch removes the raw hidapi implementations of the Enable
Encrypted Volume and Disable Encrypted Volume commands and replaces them
with the methods enable_encrypted_volume and disable_encrypted_volume of
the Storage struct provided by the nitrokey trait.
To provide some context to the error messages, the errors are wrapped
using the map_err method of the Result enum and the get_error function
that combines a nitrokey error code and a string into a nitrocli error.
It would be more idiomatic to define a conversion from a nitrokey error
to a nitrocli error, but then we would lose information about the
context of the error.
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In preparation for the switch to using Rust 2018, this change enables
the rust_2018_compatibility lint. Along with that enablement we fix the
warnings emitted by it, which evolve around the module system changes
Rust has gone through and that require us to prefix initial uses of
crate local modules with "crate".
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The clippy tool has a couple of suggestions on how to improve the code.
This change applies them to the project's code base.
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In the past the Nitrokey Storage device reported wrong CRC values for
certain commands, e.g., the closing of an encrypted volume. This problem
was tracked by issue 32: Nitrokey/nitrokey-storage-firmware#32
Firmware version 0.47 includes a fix for the problem. With this change
we remove the workaround for the incorrect CRC from nitrocli. By doing
so, we require the Nitrokey Storage to be running firmware 0.47 or
higher to be properly usable.
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The nitrokey-storage-firmware package defines an array of four byte
values to hold information about the firmware version. libnitrokey uses
a similar definition but overlays it with some more semantically
meaningful information by putting it into a union:
union {
uint8_t VersionInfo_au8[4];
struct {
uint8_t __unused;
uint8_t major;
uint8_t __unused2;
uint8_t minor;
} versionInfo;
};
In order to derive the firmware version representation for nitrocli we
used the same major/minor version definition as libnitrokey. This
definition, however, is wrong or at least not in line with how the
firmware is versioned officially.
This change reworks the way we interpret the version information
reported by the Nitrokey Storage device. Like the firmware, we treat the
first byte as the major version and the second one as the minor version.
The remaining two bytes seem to represent the build number and an
internal version according to usage of those fields in
nitrokey-storage-firmware but we ignore both to keep the reported string
similar to that of the nitrokey-app.
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When a wrong password is entered when attempting to open the encrypted
volume the nitrokey will report that in the form of an error. In such a
case we should retry the operation after asking the user for the
corrected password.
This change implements this logic. Note that because we use gpg-agent
for the PIN inquiry and because it caches passwords by default we must
make sure to clear the cache before retrying.
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The nitrokey supports a status command that instructs it to report
details about itself. This data includes general useful information such
as the current version of the firmware being installed along with more
contextual bits such as the number of remaining retries for the user
and admin PINs or whether the different volumes (unencrypted, encrypted,
hidden) are writable.
This change introduces the 'status' command line option that can be used
to retrieve this information from the nitrokey and to display it.
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The nitrokey embeds a wrong CRC code into the response for certain
commands. When closing the encrypted volume, for example, the CRC code
never matches the actual report data. This problem is tracked by issue
32: https://github.com/Nitrokey/nitrokey-storage-firmware/issues/32
To work around this problem for now we unfortunately have to ignore the
result of the CRC check. This change adjusts the code to do that.
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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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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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