BFD-3723: Determine SAMHSA authorization based on certificate identity #2486
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| Original file line number | Diff line number | Diff line change |
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| package gov.cms.bfd.server.war; | ||
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| import static gov.cms.bfd.server.war.SpringConfiguration.SSM_PATH_SAMHSA_ALLOWED_CERTIFICATE_ALIASES_JSON; | ||
| import static gov.cms.bfd.server.war.commons.CommonTransformerUtils.SHOULD_FILTER_SAMHSA; | ||
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| import com.fasterxml.jackson.core.JsonProcessingException; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import gov.cms.bfd.server.war.commons.ClientCertificateUtils; | ||
| import jakarta.servlet.FilterChain; | ||
| import jakarta.servlet.ServletException; | ||
| import jakarta.servlet.http.HttpServletRequest; | ||
| import jakarta.servlet.http.HttpServletResponse; | ||
| import java.io.IOException; | ||
| import java.math.BigInteger; | ||
| import java.security.KeyStore; | ||
| import java.security.KeyStoreException; | ||
| import java.security.cert.X509Certificate; | ||
| import java.util.Arrays; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
| import java.util.stream.Collectors; | ||
| import org.jetbrains.annotations.NotNull; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
| import org.springframework.beans.factory.annotation.Qualifier; | ||
| import org.springframework.beans.factory.annotation.Value; | ||
| import org.springframework.stereotype.Component; | ||
| import org.springframework.web.filter.OncePerRequestFilter; | ||
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| /*** | ||
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|
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| * Filter class to add metadata to the request that says whether clients can see SAMHSA data or not. | ||
| */ | ||
| @Component("AllowSamhsaFilterBean") | ||
| public class AllowSamhsaFilter extends OncePerRequestFilter { | ||
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| /** The logger. */ | ||
| private static final Logger LOGGER = LoggerFactory.getLogger(AllowSamhsaFilter.class); | ||
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| /** List of allowed certificate serial numbers. */ | ||
| private final List<BigInteger> samhsaAllowedSerialNumbers; | ||
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| /** | ||
| * Creates a new {@link AllowSamhsaFilter}. | ||
| * | ||
| * @param samhsaAllowedCertificateAliasesJson list of certificate aliases to identify clients that | ||
| * are allowed to see SAMHSA data | ||
| * @param keyStore server key store | ||
| */ | ||
| public AllowSamhsaFilter( | ||
| @Value("${" + SSM_PATH_SAMHSA_ALLOWED_CERTIFICATE_ALIASES_JSON + "}") | ||
| String samhsaAllowedCertificateAliasesJson, | ||
| @Qualifier("serverTrustStore") KeyStore keyStore) | ||
| throws JsonProcessingException { | ||
| super(); | ||
| ObjectMapper mapper = new ObjectMapper(); | ||
| String[] samhsaAllowedCertAliases = | ||
| mapper.readValue(samhsaAllowedCertificateAliasesJson, String[].class); | ||
| this.samhsaAllowedSerialNumbers = | ||
| Arrays.stream(samhsaAllowedCertAliases) | ||
| .map(allowedCert -> getCertSerialNumber(keyStore, allowedCert)) | ||
| .filter(Objects::nonNull) | ||
| .collect(Collectors.toList()); | ||
| } | ||
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| /** | ||
| * Gets the serial number from the certificate alias. | ||
| * | ||
| * @param keyStore server key store | ||
| * @param allowedCertAlias certificate alias | ||
| * @return serial number | ||
| */ | ||
| private static BigInteger getCertSerialNumber(KeyStore keyStore, String allowedCertAlias) { | ||
| try { | ||
| X509Certificate cert = ((X509Certificate) keyStore.getCertificate(allowedCertAlias)); | ||
| if (cert == null) { | ||
| LOGGER.error( | ||
| "Certificate {} was configured to allow SAMHSA, but was not found", allowedCertAlias); | ||
| return null; | ||
| } | ||
| return cert.getSerialNumber(); | ||
| } catch (KeyStoreException e) { | ||
| LOGGER.error("Error loading keystore", e); | ||
| return null; | ||
| } | ||
| } | ||
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| /** {@inheritDoc} */ | ||
| @Override | ||
| protected void doFilterInternal( | ||
| @NotNull HttpServletRequest request, | ||
| @NotNull HttpServletResponse response, | ||
| @NotNull FilterChain chain) | ||
| throws ServletException, IOException { | ||
| BigInteger serialNumber = ClientCertificateUtils.getClientSslSerialNumber(request); | ||
| // Set the attribute on the request so the transformers can check for this property | ||
| request.setAttribute( | ||
| SHOULD_FILTER_SAMHSA, | ||
| serialNumber == null || !samhsaAllowedSerialNumbers.contains(serialNumber)); | ||
| chain.doFilter(request, response); | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| package gov.cms.bfd.server.war.commons; | ||
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| import jakarta.servlet.http.HttpServletRequest; | ||
| import java.math.BigInteger; | ||
| import java.security.cert.X509Certificate; | ||
| import javax.security.auth.x500.X500Principal; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| /*** | ||
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| * Utilities for parsing metadata from client certificates. | ||
| */ | ||
| public class ClientCertificateUtils { | ||
|
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| /** The logger for this filter. */ | ||
| private static final Logger LOGGER = LoggerFactory.getLogger(ClientCertificateUtils.class); | ||
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| /** | ||
| * Gets the {@link X500Principal#getName()} for the client certificate if available. | ||
| * | ||
| * @param request the {@link HttpServletRequest} to get the client principal DN (if any) for | ||
| * @return the {@link X500Principal#getName()} for the client certificate, or <code>null</code> if | ||
| * that's not available | ||
| */ | ||
| public static String getClientSslPrincipalDistinguishedName(HttpServletRequest request) { | ||
| /* | ||
| * Note: Now that Wildfly/JBoss is properly configured with a security realm, | ||
| * this method is equivalent to calling `request.getRemoteUser()`. | ||
| */ | ||
| X509Certificate clientCert = getClientCertificate(request); | ||
| if (clientCert == null || clientCert.getSubjectX500Principal() == null) { | ||
| LOGGER.debug("No client SSL principal available: {}", clientCert); | ||
| return null; | ||
| } | ||
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| return clientCert.getSubjectX500Principal().getName(); | ||
| } | ||
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| /** | ||
| * Gets the serial number for the client certificate if available. | ||
| * | ||
| * @param request the {@link HttpServletRequest} containing the certificate | ||
| * @return the serial number | ||
| */ | ||
| public static BigInteger getClientSslSerialNumber(HttpServletRequest request) { | ||
| X509Certificate clientCert = getClientCertificate(request); | ||
| if (clientCert == null) { | ||
| LOGGER.debug("No client cert available"); | ||
| return null; | ||
| } | ||
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| return clientCert.getSerialNumber(); | ||
| } | ||
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| /** | ||
| * Gets the {@link X509Certificate} for the {@link HttpServletRequest}'s client SSL certificate if | ||
| * available. | ||
| * | ||
| * @param request the {@link HttpServletRequest} to get the client SSL certificate for | ||
| * @return the {@link X509Certificate} for the {@link HttpServletRequest}'s client SSL | ||
| * certificate, or <code>null</code> if that's not available | ||
| */ | ||
| private static X509Certificate getClientCertificate(HttpServletRequest request) { | ||
| X509Certificate[] certs = | ||
| (X509Certificate[]) request.getAttribute("jakarta.servlet.request.X509Certificate"); | ||
| if (certs == null || certs.length == 0) { | ||
| LOGGER.debug("No client certificate found for request."); | ||
| return null; | ||
| } | ||
| return certs[certs.length - 1]; | ||
| } | ||
| } | ||
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Shellcheck was blowing up when trying to parse the certificate formats