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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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Although the version information for all the local dependencies can be
inferred from various locations, cargo requires an explicit mentioning
of the version of each dependency for the 'package' command to be
successful.
This change adds explicit versions.
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The 'libc' create got a couple of updates. This change imports the new
code and bumps the version to use.
Import subrepo libc/:libc at 7db3fd570dfb41a38fb17116e93679307178103a
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The 'gcc' create got a couple of updates. This change imports the new
code and bumps the version to use.
Import subrepo gcc/:gcc at 6b41873be3172415efcadbff1187a3ff42428943
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When closing the encrypted volume we could potentially cause the volume
to be in an inconsistent state if writes to it were cached by the
operating system.
To mitigate this case this patch causes an invocation to the sync(2)
system call to flush outstanding writes to disk.
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Until now we treated any response but "ok" and "idle" to the encrypted
volume opening command as an error and reported it. However, the opening
process is a potentially long running and it is very likely that the
nitrokey reports a couple of "busy" messages.
This change implements the logic to wait until the nitrokey either
reports an error or a successful open.
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We currently unconditionally use gpg-agent to enter the PIN to use when
opening the encrypted volume. The agent has the advantage of caching the
password for us so that subsequent invocations against the same cache
entry can be served without user interaction.
For various reasons, however, it can be desirable to have the ability to
remove this entry from the cache. This change introduces a new command
'clear' that achieves precisely this task.
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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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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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