-
Notifications
You must be signed in to change notification settings - Fork 145
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Implement Apple attestation statement format
- Loading branch information
Showing
11 changed files
with
789 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
126 changes: 126 additions & 0 deletions
126
...uthn-server-core/src/main/java/com/yubico/webauthn/AppleAttestationStatementVerifier.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| // Copyright (c) 2018, Yubico AB | ||
| // All rights reserved. | ||
| // | ||
| // Redistribution and use in source and binary forms, with or without | ||
| // modification, are permitted provided that the following conditions are met: | ||
| // | ||
| // 1. Redistributions of source code must retain the above copyright notice, this | ||
| // list of conditions and the following disclaimer. | ||
| // | ||
| // 2. Redistributions in binary form must reproduce the above copyright notice, | ||
| // this list of conditions and the following disclaimer in the documentation | ||
| // and/or other materials provided with the distribution. | ||
| // | ||
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | ||
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | ||
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | ||
| // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
|
|
||
| package com.yubico.webauthn; | ||
|
|
||
| import com.yubico.internal.util.ExceptionUtil; | ||
| import com.yubico.webauthn.data.AttestationObject; | ||
| import com.yubico.webauthn.data.AttestationType; | ||
| import com.yubico.webauthn.data.ByteArray; | ||
| import java.security.PublicKey; | ||
| import java.security.cert.CertificateException; | ||
| import java.security.cert.X509Certificate; | ||
| import java.util.Optional; | ||
| import lombok.extern.slf4j.Slf4j; | ||
|
|
||
| @Slf4j | ||
| final class AppleAttestationStatementVerifier | ||
| implements AttestationStatementVerifier, X5cAttestationStatementVerifier { | ||
|
|
||
| private static final String NONCE_EXTENSION_OID = "1.2.840.113635.100.8.2"; | ||
|
|
||
| @Override | ||
| public AttestationType getAttestationType(AttestationObject attestation) { | ||
| return AttestationType.ANONYMIZATION_CA; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean verifyAttestationSignature( | ||
| AttestationObject attestationObject, ByteArray clientDataJsonHash) { | ||
| final Optional<X509Certificate> attestationCert; | ||
| try { | ||
| attestationCert = getX5cAttestationCertificate(attestationObject); | ||
| } catch (CertificateException e) { | ||
| throw ExceptionUtil.wrapAndLog( | ||
| log, | ||
| String.format( | ||
| "Failed to parse X.509 certificate from attestation object: %s", attestationObject), | ||
| e); | ||
| } | ||
|
|
||
| return attestationCert | ||
| .map( | ||
| attestationCertificate -> { | ||
| final ByteArray nonceToHash = | ||
| attestationObject.getAuthenticatorData().getBytes().concat(clientDataJsonHash); | ||
|
|
||
| final ByteArray nonce = Crypto.sha256(nonceToHash); | ||
|
|
||
| byte[] nonceExtension = attestationCertificate.getExtensionValue(NONCE_EXTENSION_OID); | ||
| if (nonceExtension == null) { | ||
| throw new IllegalArgumentException( | ||
| "Apple anonymous attestation certificate must contain extension OID: " | ||
| + NONCE_EXTENSION_OID); | ||
| } | ||
|
|
||
| // X.509 extension values is a DER octet string: 0x0426 | ||
| // Then the extension contains a 1-element sequence: 0x3024 | ||
| // The element has context-specific tag "[1]": 0xa122 | ||
| // Then the sequence contains a 32-byte octet string: 0x0420 | ||
| final ByteArray expectedExtensionValue = | ||
| new ByteArray( | ||
| new byte[] { | ||
| 0x04, 0x26, 0x30, 0x24, (-128) + (0xa1 - 128), 0x22, 0x04, 0x20 | ||
| }) | ||
| .concat(nonce); | ||
|
|
||
| if (!expectedExtensionValue.equals(new ByteArray(nonceExtension))) { | ||
| throw new IllegalArgumentException( | ||
| String.format( | ||
| "Apple anonymous attestation certificate extension %s must equal nonceToHash. Expected: %s, was: %s", | ||
| NONCE_EXTENSION_OID, | ||
| expectedExtensionValue, | ||
| new ByteArray(nonceExtension))); | ||
| } | ||
|
|
||
| final PublicKey credentialPublicKey; | ||
| try { | ||
| credentialPublicKey = | ||
| WebAuthnCodecs.importCosePublicKey( | ||
| attestationObject | ||
| .getAuthenticatorData() | ||
| .getAttestedCredentialData() | ||
| .get() | ||
| .getCredentialPublicKey()); | ||
| } catch (Exception e) { | ||
| throw ExceptionUtil.wrapAndLog(log, "Failed to import credential public key", e); | ||
| } | ||
|
|
||
| final PublicKey certPublicKey = attestationCertificate.getPublicKey(); | ||
|
|
||
| if (!credentialPublicKey.equals(certPublicKey)) { | ||
| throw new IllegalArgumentException( | ||
| String.format( | ||
| "Apple anonymous attestation certificate subject public key must equal credential public key. Expected: %s, was: %s", | ||
| credentialPublicKey, certPublicKey)); | ||
| } | ||
|
|
||
| return true; | ||
| }) | ||
| .orElseThrow( | ||
| () -> | ||
| new IllegalArgumentException( | ||
| "Failed to parse attestation certificate from \"apple\" attestation statement.")); | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.