u2f | U2F Authentication for Node.js | Runtime Evironment library
kandi X-RAY | u2f Summary
kandi X-RAY | u2f Summary
U2F Authentication for Node.js
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Top functions reviewed by kandi - BETA
- Check registration token for registration
- Verify signature verification response
- Convert a raw PEM encoded XML to PEM .
- Convert a sequence of a sequence .
- Creates an U2 U2 request .
- Verifies that the given ECDSA signature is valid .
- Hash data .
- Convert a Buffer to Base64 string .
u2f Key Features
u2f Examples and Code Snippets
Lines of Code : 27
License : No License
Copyvar u2fc = require('u2f-client');
// High-level API
// registerRequest and signRequest, as well as returned values are specified in U2F documentation
u2fc.register(registerRequest, cb) // Register U2F device, requires user presence
u2fc.sign(sign var u2f = require('node-u2flib-server'); Community Discussions
Trending Discussions on u2f
QUESTION
I'm following the FIDO U2F instructions on https://developers.yubico.com/SSH/ on macOS Monterey with openSSH 8.6 and run into the following issue:
...ANSWER
Answered 2022-Feb-06 at 01:52Use Homebrew's OpenSSH
QUESTION
I am currently working my way into libfido2 and trying to figure out how to use wrapped private keys with it.
Yubico says in the FAQs that with YubiKey 5 unlimited key pairs can be used for FIDO U2F; however, for FIDO2 only space for 25 resident keys is promised.
Does "FIDO2" mean that resident keys are used and that FIDO2 cannot be used with (external) wrapped private keys?
If this is the case, does libfido2 offer any possibility to work with FIDO U2F and wrapped keys instead?
If so, how does libfido2 need to be configured to do this? How can I provide the library with the appropriate protected private key. At least in "fido2-assert" I don't see a way to do this when I want to create an assertion on the client.
(The function accepts four specific parameters description here, and the only one that I understand could bring the private key is the "credential id". But the name makes me doubt if my request is possible with this parameter).
I am grateful for any answer!
EDIT: In the meantime I found this link to some Solo Keys developer pages describing how it works on Solo Keys. It seems the private key is calculated on the fly - in this case credential id would work as seed for the calculation)
...ANSWER
Answered 2022-Jan-23 at 18:00FIDO2 encompasses both WebAuthn (browser API) and CTAP2 (USB/Bluetooth/NFC APIs for externally connected authenticators). CTAP2 supports both client-side and server-side credentials, and specifies how backwards compatibility with U2F/CTAP1 authenticators works. Since you're working with libfido2, the CTAP documentation might be useful to understand what it does under the hood.
Client-side discoverable credentials (previously known as resident keys) are used for usernameless flows where no Credential IDs are specified during authentication. These keys are generated randomly and require storage space. Server-side credentials (non-resident keys) are represented as Credential IDs. What type of key is created is requested during the registration process but both FIDO2 standards default to server-side credentials if not specified. U2F only supported server-side credentials.
For external authenticators with limited storage space, server-side credentials are typically wrapped private keys encrypted by a single 'master' key stored in the authenticator. Since the entire state is stored outside of the authenticator this allows for practically infinite keys to be generated even with limited storage space. But it does mean that the Credential ID generated during registration must be stored on the server, and in order to generate an assertion it must be offered back to the authenticator later for authentication. In WebAuthn these Credential ID(s) are typically presented after the user is identified (e.g. via username and password) in the allowCredentials argument, CTAP2 calls this allowList.
With the terminology now (hopefully) clarified, yes libfido2 supports both types of credentials according to the assert example:
Asks for a FIDO2 assertion corresponding to [cred_id], which may be omitted for resident keys. The obtained assertion is verified using .
QUESTION
With the eminent demise of the u2f api, I'm trying to move to WebAuthn APIs using the AppId extension to support security keys previously registered with U2F. As best I can tell from reading the docs I think I am doing it correctly, however, when attempting to authenticate I am prompted by my browser to tap my key, and my key is blinking, but upon tapping it I get the error "You're using a security key that's not registered with this website". In comparing the existing u2f authentication request I'm using the same appid and key handle.
Example U2F sign request:
...ANSWER
Answered 2021-Nov-16 at 17:53Everything about the options you pass to navigator.credentials.get() looks correct, including how you're specifying the "appid" extension. I believe the issue is that you're double-encoding your U2F credential's credential ID. Try passing the original "keyHandle" in the options instead (you can use it as-is because it's already compatible with base64url encoding):
QUESTION
What is the difference between a key handle and a credential id for WebAuthN?
I see mention of the two here in the spec which states that allowCredentials MAY contain a mixture of both WebAuthn credential IDs and U2F key handles but I don't fully understand the difference.
ANSWER
Answered 2021-Sep-22 at 01:37So there is a practical short answer and deep technical long answer.
So short answer: CredentialID in U2F is called keyHandle. So CredID == KeyHandle.
Long answer:
The CredID identifies a unique private/public keypair in the authenticator.
The question is: How do you store tens and hundreds of keypairs while having very constraint and limited secure cryptographic storage? Well, you do not. During registration, the device generates the private/public keypair using some seed. It then adds some additional informations, like RPID hash, and then wraps(encrypts) this data with the device secret, that is randomly generated on each reset.
The wrapped(encrypted) keypair is called KeyHandle. For the devices that have basically unlimited memory, like your phone, you most likely just create a randomly generated credential identifier, which called KeyID.
So. CredID is a standardised name for the unique credential identifier. It can be either a KeyHandle(wrapped user's privated key) or KeyID(randomly generated credid).
Should you care about it? No. I just have nothing else to do at 4am cause I have insomnia.
QUESTION
I have a CakePHP application running on Cake PHP 3.8.13, CakeDC Users 8.5.1 and PHP 7.4. I am attempting to use a custom controller so that I can adjust the behaviour of the LoginTrait and PasswordChangeTrait.
I have been following the documentation in https://github.com/CakeDC/users/blob/master/Docs/Documentation/Configuration.md#using-the-users-email-to-login
However my custom UsersController is not being used.
I have added the following lines to /config/bootstrap.php
...ANSWER
Answered 2020-Oct-12 at 07:59It appears that customising the controller does not overwrite the current route it only overwrites based on the custom controller name, i.e. instead of /login it is /myusers/login
QUESTION
I've read in multiple places that since U2F doesn’t have a concept of a user it can be used as one of the factors for login (in MFA) but not ideal for passwordless whereas webauthn has the concept of users which could help with passwordless. My question is what is that extra that webauthn adds to allow this? Yes, we do pass user information when we create the credentials but in the end we're returned a credential id (which seems to be very similar to the keyhandle) and is used to associate the user (on the server). For what i understand, webauthn def has the advantage of working with different authenticators (not just U2F keys) but apart from that what exactly does webauthn add to make passwordless easier.
CTAP describes how the browser and operating system establish communications with a compliant authentication device over USB, NFC or BLE communication mediums. Could we say CTAP is an application layer protocol (like FTP?)
When i use the finger print feature on my android phone to verify using webauthn, is the browser communicating with the OS (which in turn pops up the authenticator) using CTAP2? Where does ufc, nfc, ble, internal come up here?
Here is a diagram for browser support for webauthn. In chrome/android, what does it mean to have stable support for WebAuthnAPI but In development support for CTAP2? Does it mean some authenticators wont be supported?
ANSWER
Answered 2020-Jun-25 at 12:29The spec specifically refers to it as an application layer protocol in the abstract:
The implementation from browser to browser and OS to OS will differ. Windows 10 now offers a native API which sits over the top of Windows Hello and standardises interactions with authenticator devices. Prior to this browsers on Windows had their own implementations and their own UIs. A given CTAP2 implementation would include support for 1 or more of the transports defined in the spec, each having a binding specific to the needs of that transport. The spec is worth a read.
Lack of CTAP2 support in the examples given above would mean that while you could use a backwards compatible FIDO2/CTAP2 compliant device you'd miss out on the added features of FIDO2 - primarily resident keys and thus the ability to have passwordless logins.
ETA: This artical is pretty good and has some nice diagrams: https://hybrismart.com/2019/05/23/authentication-with-hardware-security-keys-via-webauthn-in-sap-commerce-cloud/
QUESTION
I'm currently experiencing issues generating a U2F public/private key-pair in the terminal with the following command:
ssh-keygen -t ecdsa-sk -vv
Running this command provides the following error:
...ANSWER
Answered 2020-Jun-23 at 17:09It appears that the issue causing this problem was an admin password placed on U2F functionality before I ever received the Yubikey from my work. You can't generate a U2F ecdsa-sk public/private keypair with an admin password in place.
QUESTION
I'm on my localhost and when i start the server it shows nothing. When i go to localhost:8080/register it should show "asdasd" (as you can see in the code) but it doesnt work. Can you guys help me out? Thank you very much!
...ANSWER
Answered 2020-May-12 at 14:151) for a start your are logging "asdasd" to the console and not responding to the request made at the "/register" endpoint, just modify your code to the one below.
QUESTION
I'm using my yubikey 5 NFC with U2F as well as for OTP codes. I get OTP codes using Yubico Authenticator app which seems to be a little too complicated and I was wondering if there is a way to assign it to short/long touch on my key so I don't need to open that app every time for codes I use often enough?
It seems that the authenticator uses something else than slots to store credentials, is it possible to read them with ykman or some other official command line utility/sdk?
ANSWER
Answered 2020-Apr-18 at 03:03There are two types of 6-digit OTP codes that are part of OATH: HMAC-based (HOTP), which are generated in a fixed sequence, and time-based (TOTP), which update every 30 seconds or so. TOTP are more commonly used.
The Yubikey can generate HOTP codes on touch, in either slot 1 (short touch) or 2 (long touch). You can set this up with ykman otp hotp 1 or ... 2 as the case may be. It expects the secret key in base 32 format.
This can't be done for TOTP, for the simple reason that in order to generate a time-based code, you have to know what time it is, and the Yubikey doesn't have a real-time clock on board (because it doesn't have any power source to keep it running). So it can't generate TOTP codes without assistance from the software application, which feeds it the current time from the system clock.
If you don't like the graphical authenticator app, you can generate HOTP/TOTP codes from the command line by running ykman oath code.
QUESTION
There are many sources that say FIDO2/CTAP2 is backward compatible with U2F:
...all previously certified FIDO U2F Security Keys and YubiKeys will continue to work as a second-factor authentication login experience with web browsers and online services supporting WebAuthn. - Yubico
But after looking at the specifications, I'm having trouble seeing how that actually works in practice. Specifically, it seems like there is a mismatch between FIDO2's relying party identifier and U2F's application identity.
In U2F, the application identity is a URL, like https://example.com. SHA-256 of the application identity is called the application parameter. The application parameter is what is actually sent to the authenticator during registration and authentication.
In FIDO2, the equivalent seems to be the relying party identifier, which is defined to be a domain name, like example.com.
The relying party identifier and the application identity serve the same purpose in both FIDO2/CTAP2 and U2F. However, CTAP2 authenticators get the relying party identifier directly as an UTF8 string, whereas U2F authenticators only get a SHA-256 hash of the application identity (the application parameter).
The FIDO documentation for CTAP describes how CTAP2 maps onto CTAP1/U2F. In it, they simply treat the relying party identifier directly as the application identity:
Let rpIdHash be a byte array of size 32 initialized with SHA-256 hash of rp.id parameter as CTAP1/U2F application parameter (32 bytes)
This seems inconsistent. Let's say I were example.com, and I adopted U2F second-factor authentication early on. My application id would be https://example.com, so my original U2F application parameter would be SHA256("https://example.com"):
ANSWER
Answered 2020-Mar-12 at 16:07WebAuthn supports backward compatibility with U2F via the AppID Extension documented in the W3C WebAuthn spec. The Relying Party (RP) passes the U2F application identity to the browser via this extension.
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