Tools, FAQ, Tutorials:
Validate Azure AD v2 id_token Signature
How to validate the id_token signature received from Azure AD v2.0 authentication response?
✍: FYIcenter.com
You can use some existing libraries to perform the Azure AD "id_token" signature
validation using libraries of different programming languages as suggested
in
"Azure Active Directory access tokens" article".
But you can also try to validate the "id_token" signature with your own code logic in these steps:
1. Take out the "kid" value from "Header" component of the "id_token". This will be used to identify the public key Azure AD service used to sign the "id_token". The "kid" value is replacing the "x5t" value. So stop using the "x5t" value.
Header = { "typ": "JWT", "alg": "RS256", "x5t": "nbCwW11w3XkB-xUaXwKRSLjMHGQ", "kid": "nbCwW11w3XkB-xUaXwKRSLjMHGQ"" }
2. Get a copy of the Azure AD metadata document:
GET https://login.microsoftonline.com/common/v2.0/.well-known/openid-configuration
3. Take the "jwks_uri" value from the metadata document as the URL of Azure AD public keys:
{ "authorization_endpoint": "https:\/\/login.microsoftonline.com\/common\/oauth2\/v2.0\/authorize", "token_endpoint": "https:\/\/login.microsoftonline.com\/common\/oauth2\/v2.0\/token", ... "jwks_uri": "https:\/\/login.microsoftonline.com\/common\/discovery\/v2.0\/keys", }
4. Get a copy of Azure AD public keys:
GET https://login.microsoftonline.com/common/discovery/v2.0/keys
5. Take the "x5c" value the "keys" entry with "kid" matching the value your have from the "id_token". The "x5c" value is the X.509 certificate of the public key.
{ "keys": [ { "kty": "RSA", "use": "sig", "kid": "nbCwW11w3XkB-xUaXwKRSLjMHGQ", "x5t": "nbCwW11w3XkB-xUaXwKRSLjMHGQ", "n": "u98KvoUHfs2z2YJyfkJzaGFYM58eD0...", "e": "AQAB", "x5c": [ "MIIDBTCCAe2gAwIBAgIQV68hSN9Drrl..." ] }, { "kty": "RSA", "use": "sig", "kid": "-sxMJMLCIDWMTPvZyJ6tx-CDxw0", "x5t": "-sxMJMLCIDWMTPvZyJ6tx-CDxw0", ... }, ... ] }
6. Validate the "Signature" component of the "id_token" with the public key certificate.
⇒ Azure AD v2 Access Token Request
2023-09-06, 3747🔥, 1💬
Popular Posts:
FYIcenter.com Online Tools: FYIcenter JSON Validator and Formatter FYIcenter JSON to XML Converter F...
How to view API details on the Publisher Dashboard of an Azure API Management Service? You can follo...
How To Avoid the Undefined Index Error in PHP? If you don't want your PHP page to give out errors as...
How To Loop through an Array without Using "foreach" in PHP? PHP offers the following functions to a...
Where Is the Submitted Form Data Stored in PHP? When a user submit a form on your Web server, user e...