Github user alopresto commented on a diff in the pull request: https://github.com/apache/nifi/pull/695#discussion_r72741115 --- Diff: nifi-toolkit/nifi-toolkit-tls/src/main/java/org/apache/nifi/toolkit/tls/service/TlsCertificateSigningRequestPerformer.java --- @@ -0,0 +1,144 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.nifi.toolkit.tls.service; + +import com.fasterxml.jackson.databind.ObjectMapper; +import org.apache.commons.io.IOUtils; +import org.apache.commons.io.input.BoundedInputStream; +import org.apache.http.HttpHost; +import org.apache.http.client.methods.CloseableHttpResponse; +import org.apache.http.client.methods.HttpPost; +import org.apache.http.conn.ssl.TrustSelfSignedStrategy; +import org.apache.http.entity.ByteArrayEntity; +import org.apache.http.impl.client.CloseableHttpClient; +import org.apache.http.impl.client.HttpClientBuilder; +import org.apache.http.ssl.SSLContextBuilder; +import org.apache.nifi.toolkit.tls.configuration.TlsClientConfig; +import org.apache.nifi.toolkit.tls.util.TlsHelper; +import org.bouncycastle.pkcs.jcajce.JcaPKCS10CertificationRequest; +import org.eclipse.jetty.server.Response; + +import java.io.IOException; +import java.nio.charset.StandardCharsets; +import java.security.KeyPair; +import java.security.NoSuchAlgorithmException; +import java.security.cert.X509Certificate; +import java.util.ArrayList; +import java.util.List; +import java.util.function.Supplier; + +public class TlsCertificateSigningRequestPerformer { + public static final String RECEIVED_RESPONSE_CODE = "Received response code "; + public static final String EXPECTED_ONE_CERTIFICATE = "Expected one certificate"; + public static final String EXPECTED_RESPONSE_TO_CONTAIN_HMAC = "Expected response to contain hmac"; + public static final String UNEXPECTED_HMAC_RECEIVED_POSSIBLE_MAN_IN_THE_MIDDLE = "Unexpected hmac received, possible man in the middle"; + public static final String EXPECTED_RESPONSE_TO_CONTAIN_CERTIFICATE = "Expected response to contain certificate"; + private final Supplier<HttpClientBuilder> httpClientBuilderSupplier; + private final String caHostname; + private final String dn; + private final String token; + private final int port; + private final TlsHelper tlsHelper; + + public TlsCertificateSigningRequestPerformer(TlsClientConfig tlsClientConfig) throws NoSuchAlgorithmException { + this(HttpClientBuilder::create, tlsClientConfig.getCaHostname(), tlsClientConfig.getDn(), tlsClientConfig.getToken(), tlsClientConfig.getPort(), tlsClientConfig.createTlsHelper()); + } + + public TlsCertificateSigningRequestPerformer(Supplier<HttpClientBuilder> httpClientBuilderSupplier, TlsClientConfig tlsClientConfig) throws NoSuchAlgorithmException { + this(httpClientBuilderSupplier, tlsClientConfig.getCaHostname(), tlsClientConfig.getDn(), tlsClientConfig.getToken(), tlsClientConfig.getPort(), tlsClientConfig.createTlsHelper()); + } + + public TlsCertificateSigningRequestPerformer(Supplier<HttpClientBuilder> httpClientBuilderSupplier, String caHostname, String dn, String token, int port, TlsHelper tlsHelper) { + this.httpClientBuilderSupplier = httpClientBuilderSupplier; + this.caHostname = caHostname; + this.dn = dn; + this.token = token; + this.port = port; + this.tlsHelper = tlsHelper; + } + + public static String getDn(String hostname) { + return "CN=" + hostname + ",OU=NIFI"; + } + + /** + * Submits a CSR to the Certificate authority, checks the resulting hmac, and returns the chain if everything succeeds + * + * @param objectMapper for serialization + * @param keyPair the keypair to generate the csr for + * @throws IOException if there is a problem during the process + * @returnd the resulting certificate chain + */ + public X509Certificate[] perform(ObjectMapper objectMapper, KeyPair keyPair) throws IOException { + try { + List<X509Certificate> certificates = new ArrayList<>(); + + HttpClientBuilder httpClientBuilder = httpClientBuilderSupplier.get(); + SSLContextBuilder sslContextBuilder = SSLContextBuilder.create(); + + // We will be validating that we are talking to the correct host once we get the response's hmac of the token and public key of the ca + sslContextBuilder.loadTrustMaterial(null, new TrustSelfSignedStrategy()); + httpClientBuilder.setSSLSocketFactory(new TlsCertificateAuthorityClientSocketFactory(sslContextBuilder.build(), caHostname, certificates)); + + String jsonResponseString; + int responseCode; + try (CloseableHttpClient client = httpClientBuilder.build()) { + JcaPKCS10CertificationRequest request = tlsHelper.generateCertificationRequest(dn, keyPair); + TlsCertificateAuthorityRequest tlsCertificateAuthorityRequest = new TlsCertificateAuthorityRequest(tlsHelper.calculateHMac(token, request.getPublicKey()), + tlsHelper.pemEncodeJcaObject(request)); + + HttpPost httpPost = new HttpPost(); + httpPost.setEntity(new ByteArrayEntity(objectMapper.writeValueAsBytes(tlsCertificateAuthorityRequest))); + + try (CloseableHttpResponse response = client.execute(new HttpHost(caHostname, port, "https"), httpPost)) { + jsonResponseString = IOUtils.toString(new BoundedInputStream(response.getEntity().getContent(), 1024 * 1024), StandardCharsets.UTF_8); + responseCode = response.getStatusLine().getStatusCode(); + } + } + + if (responseCode != Response.SC_OK) { + throw new IOException(RECEIVED_RESPONSE_CODE + responseCode + " with payload " + jsonResponseString); --- End diff -- We should be very careful and evaluate all possible responses from the server to ensure that something sensitive is not accidentally exposed through an exception being printed in a log if there is an error condition.
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