Supported with AM 6.5.1 and later versions.

In OAuth2ResourceServerFilter, use the ConfirmationKeyVerifierAccessTokenResolver to verify that certificate-bound OAuth 2.0 bearer tokens presented by clients use the same mTLS-authenticated HTTP connection.

When a client obtains an access_token from AM by using mTLS, AM can optionally use a confirmation key to bind the access_token to a certificate. When the client connects to IG using that certificate, the ConfirmationKeyVerifierAccessTokenResolver verifies that the confirmation key corresponds to the certificate.

This proof-of-possession interaction ensures that only the client in possession of the key corresponding to the certificate can use the access_token to access protected resources.

To use the ConfirmationKeyVerifierAccessTokenResolver, the following configuration is required in AM:

  • OAuth 2.0 clients must be registered using an X.509 certificate, that is self-signed or signed in public key infrastructure (PKI)

  • The AM client authentication method must be self_signed_client_auth or tls_client_auth.

  • AM must be configured to bind a confirmation key to each client certificate.

The ConfirmationKeyVerifierAccessTokenResolver delegates the token resolution to a specified AccessTokenResolver, which retrieves the token information. The ConfirmationKeyVerifierAccessTokenResolver verifies the confirmation keys bound to the access_token, and then acts as follows:

  • If there is no confirmation key, pass the request down the chain.

  • If the confirmation key matches the client certificate, pass the request down the chain.

  • If the confirmation key doesn't match the client certificate, throw an error.

  • If the confirmation key method is not supported by IG, throw an error.

For an example that uses the ConfirmationKeyVerifierAccessTokenResolver, see "Validating Certificate-Bound Access Tokens".

For information about issuing certificate-bound OAuth 2.0 access_tokens, see Certificate-Bound Proof-of-Possession in AM's OAuth 2.0 Guide. For information about authenticating an OAuth 2.0 client using mTLS certificates, see Authenticating Clients Using Mutual TLS in AM's OAuth 2.0 Guide.


Use this resolver with the accessTokenResolver property of "OAuth2ResourceServerFilter".

"accessTokenResolver": {
  "type": "ConfirmationKeyVerifierAccessTokenResolver",
  "config": {
    "delegate": accessTokenResolver reference


"delegate": accessTokenResolver reference, required

The access token resolver to use for resolving access_tokens. Use any access token resolver described in Access Token Resolvers.


For an example that uses the ConfirmationKeyVerifierAccessTokenResolver with the following route, see "Validating Certificate-Bound Access Tokens".

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