我们目前在Sping Boot 应用程序中实现了相互身份验证，需要在Azure中部署它。Azure的负载平衡器在请求头字段“X-ARR-ClientCert”中重定向客户端证书（Base64编码），Spring无法在那里找到它。=>身份验证失败
Microsoft文档展示了如何在.NET应用程序中处理此问题：https://learn.microsoft.com/en-gb/azure/app-service-web/app-service-web-configure-tls-mutual-auth
我试着从OncePerRequestFilter的头中提取证书，并将其设置为请求如下：

public class AzureCertificateFilter extends OncePerRequestFilter {
    private static final Logger LOG = LoggerFactory.getLogger(AzureCertifacteFilter.class);
    private static final String AZURE_CLIENT_CERTIFICATE_HEADER = "X-ARR-ClientCert";
    private static final String JAVAX_SERVLET_REQUEST_X509_CERTIFICATE = "javax.servlet.request.X509Certificate";
    private static final String BEGIN_CERT = "-----BEGIN CERTIFICATE-----\n";
    private static final String END_CERT = "\n-----END CERTIFICATE-----";
    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        X509Certificate x509Certificate = extractClientCertificate(httpServletRequest);
        // azure redirects the certificate in a header field
        if (x509Certificate == null && StringUtils.isNotBlank(httpServletRequest.getHeader(AZURE_CLIENT_CERTIFICATE_HEADER))) {
            String x509CertHeader = BEGIN_CERT + httpServletRequest.getHeader(AZURE_CLIENT_CERTIFICATE_HEADER) + END_CERT;
            try (ByteArrayInputStream certificateStream = new ByteArrayInputStream(x509CertHeader.getBytes())) {
                X509Certificate certificate = (X509Certificate) CertificateFactory.getInstance("X.509").generateCertificate(certificateStream);
                httpServletRequest.setAttribute(JAVAX_SERVLET_REQUEST_X509_CERTIFICATE, certificate);
            } catch (CertificateException e) {
                LOG.error("X.509 certificate could not be created out of the header field {}. Exception: {}", AZURE_CLIENT_CERTIFICATE_HEADER, e.getMessage());
            }
        }
        filterChain.doFilter(httpServletRequest, httpServletResponse);
    }
    private X509Certificate extractClientCertificate(HttpServletRequest request) {
        X509Certificate[] certs = (X509Certificate[]) request.getAttribute(JAVAX_SERVLET_REQUEST_X509_CERTIFICATE);
        if (certs != null && certs.length > 0) {
            LOG.debug("X.509 client authentication certificate:" + certs[0]);
            return certs[0];
        }
        LOG.debug("No client certificate found in request.");
        return null;
    }
}

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但这在Spring filter链中会失败，但有以下例外：

sun.security.x509.X509CertImpl cannot be cast to [Ljava.security.cert.X509Certificate; /oaa/v1/spaces

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配置如下所示：

@Override
public void configure(HttpSecurity http) throws Exception {
    http.authorizeRequests()
        .antMatchers("**/docs/restapi/**").permitAll()
        .anyRequest().authenticated()
        .and()
        .httpBasic()
        .disable()
        .addFilterBefore(new AzureCertificateFilter(), X509AuthenticationFilter.class)
        .x509()
        .subjectPrincipalRegex("CN=(.*?)(?:,|$)")
        .userDetailsService(userDetailsService());
}

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