|
HTML rendering created 2023-12-22 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|
|
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | COMMANDS | CONFIG FILE | ENVIRONMENT | EXTENSIONS | FILES | EXAMPLES | COLOPHON |
|
|
|
NITROCLI(1) General Commands Manual NITROCLI(1)
nitrocli - access Nitrokey devices
nitrocli command [arguments]
nitrocli provides access to Nitrokey devices. It supports the
Nitrokey Pro, the Nitrokey Storage, and the Librem Key. It can
be used to access the encrypted volume, the one-time password
generator, and the password safe.
Device selection
Per default, nitrocli connects to any attached Nitrokey device.
You can use the --model, --serial-number and --usb-path options
to select the device to connect to. nitrocli fails if more than
one attached Nitrokey device matches this filter or if multiple
Nitrokey devices are attached and none of the filter options is
set. Use the list command to list all attached devices with
their USB path, model, and serial number (if available).
-m, --model librem|pro|storage
Restrict connections to the given device model, see the
Device selection section.
--serial-number serial-number
Restrict connections to the given serial number, see the
Device selection section. serial-number must be a hex
string with an optional 0x prefix. This option can be set
multiple times to allow any of the given serial numbers.
Nitrokey Storage devices never match this restriction as
they do not expose their serial number in the USB device
descriptor.
--usb-path usb-path
Restrict connections to the given USB path, see the Device
selection section.
--no-cache
If this option is set, nitrocli will not cache any
inquired secrets using gpg-agent(1) but ask for them each
time they are needed. Note that this option does not
cause any cached secrets to be cleared. If a secret is
already in the cache it will be ignored, but left
otherwise untouched. Use the pin clear command to clear
secrets from the cache.
-v, --verbose
Enable additional logging and control its verbosity.
Logging enabled through this option will appear on the
standard error stream. This option can be supplied
multiple times. A single occurrence will show additional
warnings. Commands sent to the device will be shown when
supplied three times and full device communication is
available with four occurrences. Supplying this option
five times enables the highest verbosity.
-V, --version
Print the nitrocli version and exit.
General
nitrocli list [-n|--no-connect]
List all attached Nitrokey devices. This command prints a
list of the USB path, the model and the serial number of
all attached Nitrokey devices. To access the serial
number of a Nitrokey Storage device, nitrocli has to
connect to it. To omit the serial number of Nitrokey
Storage devices instead of connecting to them, set the
--no-connect option.
nitrocli status
Print the status of the connected Nitrokey device,
including the stick serial number, the firmware version,
and the PIN retry count. If the device is a Nitrokey
Storage, also print storage related information including
the SD card serial number, the SD card usage during this
power cycle, the encryption status, and the status of the
volumes.
nitrocli lock
Lock the Nitrokey. This command locks the password safe
(see the Password safe section). On the Nitrokey Storage,
it will also close any active encrypted or hidden volumes
(see the Storage section).
nitrocli reset [--only-aes-key]
Perform a factory reset on the Nitrokey. This command
performs a factory reset on the OpenPGP smart card, clears
the flash storage and builds a new AES key. The user PIN
is reset to 123456, the admin PIN to 12345678.
If the --only-aes-key option is set, the command does not
perform a full factory reset but only creates a new AES
key. The AES key is for example used to encrypt the
password safe.
This command requires the admin PIN. To avoid accidental
calls of this command, the user has to enter the PIN even
if it has been cached.
Storage
The Nitrokey Storage comes with a storage area. This area is
comprised of an unencrypted region and an encrypted one of fixed
sizes, each made available to the user in the form of block
devices. The encrypted region can optionally further be overlayed
with up to four hidden volumes. Because of this overlay (which is
required to achieve plausible deniability of the existence of
hidden volumes), the burden of ensuring that data on the
encrypted volume does not overlap with data on one of the hidden
volumes is on the user.
nitrocli unencrypted set mode
Change the read-write mode of the volume. mode is the
type of the mode to change to: read-write to make the
volume readable and writable or read-only to make it only
readable. This command requires the admin PIN.
Note that this command requires firmware version 0.51 or
higher. Earlier versions are not supported.
nitrocli encrypted open
Open the encrypted volume on the Nitrokey Storage. The
user PIN that is required to open the volume is queried
using pinentry(1) and cached by gpg-agent(1).
nitrocli encrypted close
Close the encrypted volume on the Nitrokey Storage.
nitrocli hidden create slot start end
Create a new hidden volume inside the encrypted volume.
slot must indicate one of the four available slots. start
and end represent, respectively, the start and end
position of the hidden volume inside the encrypted volume,
as a percentage of the encrypted volume's size. This
command requires a password which is later used to look up
the hidden volume to open. Unlike a PIN, this password is
not cached by gpg-agent(1).
As a guide line for creating new hidden volumes, the
status command provides a range of the SD card that has
not been written to during this power cycle.
nitrocli hidden open
Open a hidden volume. The volume to open is determined
based on the password entered, which must have a minimum
of six characters. Only one hidden volume can be active at
any point in time and previously opened volumes will be
automatically closed. Similarly, the encrypted volume will
be closed if it was open.
nitrocli hidden close
Close a hidden volume.
nitrocli fill [-a|--attach
Fills the SD card with random data, overwriting all
existing data. This operation takes about one hour to
finish for a 16 GiB SD card. It cannot be canceled, even
if the nitrocli process is terminated before it finishes.
This command requires the admin PIN. To avoid accidental
calls of this command, the user has to enter the PIN even
if it has been cached.
If the --attach option is set, this command will not start
a new fill operation. Instead it checks whether a fill
operation is currently running on the device and shows its
progress.
One-time passwords
The Nitrokey Pro, the Nitrokey Storage, and the Librem Key
support the generation of one-time passwords using the HOTP
algorithm according to RFC 4226 or the TOTP algorithm according
to RFC 6238. The required data – a name and the secret – is
stored in slots. Currently, the Nitrokey devices provide three
HOTP slots and 15 TOTP slots. The slots are numbered per
algorithm starting at zero.
The TOTP algorithm is a modified version of the HOTP algorithm
that also uses the current time. Therefore, the Nitrokey clock
must be synchronized with the clock of the application that
requests the one-time password.
nitrocli otp get slot [-a|--algorithm algorithm] [-t|--time time]
Generate a one-time password. slot is the number of the
slot to generate the password from. algorithm is the OTP
algorithm to use. Possible values are hotp for the HOTP
algorithm according to RFC 4226 and totp for the TOTP
algorithm according to RFC 6238 (default). Per default,
this commands sets the Nitrokey's time to the system time
if the TOTP algorithm is selected. If --time is set, it
is set to time instead, which must be a Unix timestamp
(i.e., the number of seconds since 1970-01-01 00:00:00
UTC). This command might require the user PIN (see the
Configuration section).
nitrocli otp set slot name secret|- [-a|--algorithm algorithm]
[-d|--digits digits] [-c|--counter counter] [-t|--time-window
time-window] [-f|--format ascii|base32|hex]
Configure a one-time password slot. slot is the number of
the slot to configure. name is the name of the slot (may
not be empty). secret is the secret value to store in
that slot. If secret is set to -, the secret is read from
the standard input.
The --format option specifies the format of the secret.
If it is set to ascii, each character of the given secret
is interpreted as the ASCII code of one byte. If it is
set to base32, the secret is interpreted as a base32
string according to RFC 4648. If it is set to hex, every
two characters are interpreted as the hexadecimal value of
one byte. The default value is base32.
algorithm is the OTP algorithm to use. Possible values
are hotp for the HOTP algorithm according to RFC 4226 and
totp for the TOTP algorithm according to RFC 6238
(default). digits is the number of digits the one-time
password should have. Allowed values are 6 and 8
(default: 6). counter is the initial counter if the HOTP
algorithm is used (default: 0). time-window is the time
window used with TOTP in seconds (default: 30).
nitrocli otp clear slot [-a|--algorithm algorithm]
Delete the name and the secret stored in a one-time
password slot. slot is the number of the slot to clear.
algorithm is the OTP algorithm to use. Possible values
are hotp for the HOTP algorithm according to RFC 4226 and
totp for the TOTP algorithm according to RFC 6238
(default).
nitrocli otp status [-a|--all]
List all OTP slots. If --all is not set, empty slots are
ignored.
Configuration
Nitrokey devices have four configuration settings: the Num Lock,
Caps Lock and Scroll Lock keys can be mapped to an HOTP slot, and
OTP generation can be set to require the user PIN.
nitrocli config get
Print the current Nitrokey configuration.
nitrocli config set [[-n|--num-lock slot] | [-N|--no-num-lock]]
[[-c|--caps-lock slot] | [-C|--no-caps-lock]] [[-s|--scroll-lock
slot] | [-S|--no-scroll-lock]] [[-o|--otp-pin] |
[-O|--no-otp-pin]]
Update the Nitrokey configuration. This command requires
the admin PIN.
With the --num-lock, --caps-lock and --scroll-lock
options, the respective bindings can be set. slot is the
number of the HOTP slot to bind the key to. If --no-num-
lock, --no-caps-lock or --no-scroll-lock is set, the
respective binding is disabled. The two corresponding
options are mutually exclusive.
If --otp-pin is set, the user PIN will be required to
generate one-time passwords using the otp get command. If
--no-otp-pin is set, OTP generation can be performed
without PIN. These two options are mutually exclusive.
Password safe
The Nitrokey Pro, the Nitrokey Storage, and the Librem Key
provide a password safe (PWS) with 16 slots. In each of these
slots you can store a name, a login, and a password. The PWS is
not encrypted, but it is protected with the user PIN by the
firmware. Once the PWS is unlocked by one of the commands listed
below, it can be accessed without authentication. You can use
the lock command to lock the password safe.
nitrocli pws get slot [-n|--name] [-l|--login] [-p|--password]
[-q|--quiet]
Print the content of one PWS slot. slot is the number of
the slot. Per default, this command prints the name, the
login and the password (in that order). If one or more of
the options --name, --login, and --password are set, only
the selected fields are printed. The order of the fields
never changes.
The fields are printed together with a label. Use the
--quiet option to suppress the labels and to only output
the values stored in the PWS slot.
nitrocli pws add [-s|--slot slot] name login password|-
Add a new PWS slot. If the --slot option is set, this
command writes the data to the given slot and fails if the
slot is already programmed. If the --slot option is not
set, this command locates the first free PWS slot and sets
its content to the given values. It fails if all PWS
slots are programmed.
If password is set to -, the password is read from the
standard input.
nitrocli pws update slot [-n|--name name] [-l|--login login]
[-p|--password password|-]
Update the content of a programmed PWS slot. slot is the
number of the slot to write. This command only sets the
data given with the --name, --login, and --password
options and does not overwrite the other fields of the
slot.
If password is set to -, the password is read from the
standard input.
nitrocli pws clear slot
Delete the data stored in a PWS slot. slot is the number
of the slot clear.
nitrocli pws status [-a|--all]
List all PWS slots. If --all is not set, empty slots are
ignored.
PINs
Nitrokey devices have two PINs: the user PIN and the admin PIN.
The user PIN must have at least six, the admin PIN at least eight
characters. The user PIN is required for commands such as otp get
(depending on the configuration) and for all pws commands. The
admin PIN is usually required to change the device configuration.
Each PIN has a retry counter that is decreased with every wrong
PIN entry and reset if the PIN was entered correctly. The
initial retry counter is three. If the retry counter for the
user PIN is zero, you can use the pin unblock command to unblock
and reset the user PIN. If the retry counter for the admin PIN
is zero, you have to perform a factory reset using the reset
command or gpg(1). Use the status command to check the retry
counters.
nitrocli pin clear
Clear the PINs cached by the other commands. Note that
cached PINs are associated with the device they belong to
and the clear command will only clear the PIN for the
currently used device, not all others.
nitrocli pin set type
Change a PIN. type is the type of the PIN that will be
changed: admin to change the admin PIN or user to change
the user PIN. This command only works if the retry
counter for the PIN type is at least one. (Use the status
command to check the retry counters.)
nitrocli pin unblock
Unblock and reset the user PIN. This command requires the
admin PIN. The admin PIN cannot be unblocked. This
operation is equivalent to the unblock PIN option provided
by gpg(1) (using the --change-pin option).
Extensions
In addition to the above built-in commands, nitrocli supports
user-provided functionality in the form of extensions. An
extension can be any executable file whose filename starts with
"nitrocli-" and that is discoverable through lookup via the PATH
environment variable. Those executables can be invoked as regular
subcommands (without the need of the prefix; e.g., an extension
with the name "nitrocli-otp-cache" could be invoked as "nitrocli
otp-cache").
More information on how to write extensions can be found in the
Extensions section below.
nitrocli tries to read the configuration file at
${XDG_CONFIG_HOME}/nitrocli/config.toml (or
${HOME}/nitrocli/config.toml if the XDG_CONFIG_HOME environment
variable is not set). It is used to set default values for the
options listed below.
You can also set the environment variable NITROCLI_KEY to
overwrite the configuration for key (see the Environment
section). Note that command-line arguments overwrite both the
configuration file and the environment variables.
The following values can be set in the configuration file:
model Restrict connections to the given device model (string,
default: not set, see --model).
serial_numbers
Restrict connections to the given serial numbers (list of
strings, default: empty, see --serial-number).
usb_path
Restrict connections to the given USB path (string,
default: not set, see --usb-path).
no_cache
If set to true, do not cache any inquired secrets
(boolean, default: false, see --no-cache).
verbosity
Set the log level (integer, default: 0, see --verbose).
The configuration file must use the TOML format, for example:
model = "pro"
serial_numbers = ["0xf00baa", "deadbeef"]
usb_path = "0001:0006:02"
no_cache = false
verbosity = 0
The program honors two sets of environment variables, all
prefixed by "NITROCLI_".
Configuration
The first set controls basic configuration of the program. These
variables mirror the respective command line options and
configuration file settings. They are:
NITROCLI_MODEL
Restrict connections to the given device model (string,
default: not set, see --model).
NITROCLI_SERIAL_NUMBERS
Restrict connections to the given list of serial numbers
(comma-separated list of strings, default: empty, see
--serial-number).
NITROCLI_USB_PATH
Restrict connections to the given USB path (string,
default: not set, see --usb-path).
NITROCLI_NO_CACHE
If set to true, do not cache any inquired secrets
(boolean, default: false, see --no-cache).
NITROCLI_VERBOSITY
Set the log level (integer, default: 0, see --verbose).
Password & PIN entry
The second set can be used to provide password & PIN data to the
program to suppress interactive entry through pinentry(1) for
operations that otherwise would ask for it. The following
variables are recognized:
NITROCLI_ADMIN_PIN
The admin PIN to use.
NITROCLI_USER_PIN
The user PIN to use.
NITROCLI_NEW_ADMIN_PIN
The new admin PIN to set. This variable is only used by
the pin set command for the admin type.
NITROCLI_NEW_USER_PIN
The new user PIN to set. This variable is only used by the
pin set command for the user type.
NITROCLI_PASSWORD
A password used by commands that require one (e.g., hidden
open).
nitrocli supports user-provided extensions that are executable
files whose filename starts with "nitrocli-" and that are
discoverable through lookup via the PATH environment variable.
The program conveys basic configuration information to any
extension being started this way. Specifically, it will set each
environment variable as described in the Configuration subsection
of the Environment section above, if the corresponding nitrocli
program configuration was set. In addition, the following
variables will be set:
NITROCLI_BINARY
The absolute path to the nitrocli binary through which the
extension was invoked. This path may be used to
recursively invoke nitrocli to implement certain
functionality.
NITROCLI_RESOLVED_USB_PATH
The USB path of the device that nitrocli would connect to
based on the --model, --serial-number, and --usb-path
options. If there is no matching Nitrokey device, or if
multiple devices match the options, the environment
variable is not set.
All other variables present in the environment will be passed
through to the extension verbatim.
Newer versions of the program reserve the right to set additional
environment variables inside the "NITROCLI_" namespace. As such,
extensions are advised to not define custom variables with this
prefix. However, "NITROCLI_EXT_" is provided specifically for
this purpose. To further avoid conflicts between extensions, it
is recommended that this prefix be followed by the extension's
name (uppercased).
Extensions may optionally read or write persistent data of
various forms. Similar to the main program, extensions should
follow the XDG Base Directory Specification as a guideline where
to store such data. More specifically, the following conventions
should be followed:
For configuration data, ${XDG_CONFIG_HOME}/extension/ is the
preferred directory, where extension is the full extension name,
including the "nitrocli-" prefix. The recommended configuration
format is TOML. If only a single configuration file is used,
config.toml is the recommended name.
Similarly, regular data should reside in
${XDG_DATA_HOME}/extension/ and cached data be stored in
${XDG_CACHE_HOME}/extension/.
${XDG_CONFIG_HOME}/nitrocli/config.toml
${HOME}/nitrocli/config.toml
User configuration file, see the Config file section.
Storage
Create a hidden volume in the first available slot, starting at
half the size of the encrypted volume (i.e., 50%) and stretching
all the way to its end (100%):
$ nitrocli hidden create 0 50 100
One-time passwords
Configure a one-time password slot with a hexadecimal secret
representation:
$ nitrocli otp set 0 test-rfc4226
3132333435363738393031323334353637383930 --format hex --algorithm
hotp
$ nitrocli otp set 1 test-foobar 666F6F626172 --format hex
--algorithm hotp
$ nitrocli otp set 0 test-rfc6238
3132333435363738393031323334353637383930 --format hex --algorithm
totp --digits 8
Configure a one-time password slot with an ASCII secret
representation:
$ nitrocli otp set 0 test-rfc4226 12345678901234567890
--format ascii --algorithm hotp
$ nitrocli otp set 1 test-foobar foobar --format ascii
--algorithm hotp
$ nitrocli otp set 0 test-rfc6238 12345678901234567890
--format ascii --algorithm totp --digits 8
Configure a one-time password slot with a base32 secret
representation:
$ nitrocli otp set 0 test-rfc4226
gezdgnbvgy3tqojqgezdgnbvgy3tqojq --algorithm hotp
$ nitrocli otp set 1 test-foobar mzxw6ytboi====== --algorithm
hotp
$ nitrocli otp set 0 test-rfc6238
gezdgnbvgy3tqojqgezdgnbvgy3tqojq --algorithm totp --digits 8
Generate a one-time password:
$ nitrocli otp get 0 --algorithm hotp
755224
$ nitrocli otp get 0 --algorithm totp --time 1234567890
89005924
Clear a one-time password slot:
$ nitrocli otp clear 0 --algorithm hotp
Configuration
Query the configuration:
$ nitrocli config get
Config:
numlock binding: not set
capslock binding: not set
scrollock binding: not set
require user PIN for OTP: true
Change the configuration:
$ nitrocli config set --otp-pin
Password safe
Configure a PWS slot:
$ nitrocli pws add example.org john.doe passw0rd
Added PWS slot 0
Get the data from a slot:
$ nitrocli pws get 0
name: example.org
login: john.doe
password: passw0rd
Copy the password to the clipboard (requires xclip(1)).
$ nitrocli pws get 0 --password --quiet | xclip -in
Query the PWS slots:
$ nitrocli pws status
slot name
0 example.org
This page is part of the nitrocli (a command-line tool for
interacting with Nitrokey devices) project. Information about
the project can be found at
⟨https://github.com/d-e-s-o/nitrocli/tree/master⟩. If you have a
bug report for this manual page, see
⟨https://github.com/d-e-s-o/nitrocli/issues⟩. This page was
obtained from the project's upstream Git repository
⟨https://github.com/d-e-s-o/nitrocli.git⟩ on 2023-12-22. (At
that time, the date of the most recent commit that was found in
the repository was 2023-01-05.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
2021-04-24 NITROCLI(1)
|
HTML rendering created 2023-12-22 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|