281 lines
10 KiB
Java
281 lines
10 KiB
Java
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package com.senmesh.sfile.client;
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import cn.hutool.core.io.IoUtil;
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import com.senmesh.common.exception.BusinessException;
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import com.senmesh.common.util.JsonUtils;
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import com.senmesh.sfile.config.MeshSafeProperties;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.commons.codec.digest.DigestUtils;
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import org.apache.commons.lang3.StringUtils;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Component;
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import javax.crypto.Mac;
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import javax.crypto.spec.SecretKeySpec;
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import java.io.ByteArrayOutputStream;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.nio.charset.StandardCharsets;
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import java.util.LinkedHashMap;
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import java.util.Map;
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import java.util.UUID;
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/**
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* MeshSafe 文件安全检测客户端
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* <p>
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* 对接 MeshSafe /api/v1 接口，认证规范见 MeshSafe《对外接口文档》：
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* 请求需携带 HMAC-SHA256 签名（密钥经 HKDF-SHA256 派生），响应需验签，
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* 验签失败的检测结论一律拒绝使用。
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*/
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@Slf4j
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@Component
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public class MeshSafeClient {
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private static final String PATH_SCANS = "/api/v1/scans";
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private static final String INFO_REQUEST_SIGNING = "meshsafe/api/v1/request-signing";
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private static final String INFO_RESPONSE_SIGNING = "meshsafe/api/v1/response-signing";
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private static final String HEADER_CLIENT_ID = "X-MS-Client-Id";
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private static final String HEADER_TIMESTAMP = "X-MS-Timestamp";
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private static final String HEADER_NONCE = "X-MS-Nonce";
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private static final String HEADER_BODY_SHA256 = "X-MS-Body-SHA256";
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private static final String HEADER_SIGNATURE = "X-MS-Signature";
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private static final String HEADER_RESPONSE_TIMESTAMP = "X-MS-Response-Timestamp";
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private static final String HEADER_RESPONSE_SIGNATURE = "X-MS-Response-Signature";
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private static final String MULTIPART_BOUNDARY_PREFIX = "----MeshSafeBoundary";
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@Autowired
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private MeshSafeProperties meshSafeProperties;
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/**
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* 提交文件检测（同步模式直接返回结论，异步模式返回受理结果需轮询）
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*
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* @param fileName 文件名
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* @param fileBytes 文件字节
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* @return 检测结果
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*/
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public MeshSafeScanResult scan(String fileName, byte[] fileBytes) {
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String boundary = MULTIPART_BOUNDARY_PREFIX + UUID.randomUUID().toString().replace("-", "");
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byte[] body = buildMultipartBody(boundary, fileName, fileBytes);
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String contentType = "multipart/form-data; boundary=" + boundary;
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Map<String, String> headers = signHeaders("POST", PATH_SCANS, body);
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headers.put("Content-Type", contentType);
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String responseBody = execute("POST", PATH_SCANS, headers, body);
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return parseScanResult(responseBody);
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}
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/**
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* 查询检测任务结果
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*
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* @param taskId MeshSafe 任务ID
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* @return 检测结果
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*/
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public MeshSafeScanResult getScan(String taskId) {
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String path = PATH_SCANS + "/" + taskId;
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Map<String, String> headers = signHeaders("GET", path, new byte[0]);
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String responseBody = execute("GET", path, headers, null);
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return parseScanResult(responseBody);
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}
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/**
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* 回写人工复核结论到 MeshSafe
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*
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* @param taskId MeshSafe 任务ID
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* @param decision 复核结论：pass / reject
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* @param comment 复核说明
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*/
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public void review(String taskId, String decision, String comment) {
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String path = PATH_SCANS + "/" + taskId + "/review";
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Map<String, Object> bodyMap = new LinkedHashMap<>();
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bodyMap.put("decision", decision);
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bodyMap.put("comment", comment);
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byte[] body = JsonUtils.toJsonString(bodyMap).getBytes(StandardCharsets.UTF_8);
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Map<String, String> headers = signHeaders("POST", path, body);
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headers.put("Content-Type", "application/json");
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execute("POST", path, headers, body);
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}
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/**
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* 发送请求并验签
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* 使用JDK原生HttpURLConnection保证multipart字节与签名计算完全一致
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* (hutool检测到multipart Content-Type时会重建表单体导致body被覆盖)
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*/
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private String execute(String method, String path, Map<String, String> headers, byte[] body) {
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String url = StringUtils.removeEnd(meshSafeProperties.getBaseUrl(), "/") + path;
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byte[] bodyBytes = body == null ? new byte[0] : body;
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try {
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HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
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conn.setRequestMethod(method);
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conn.setConnectTimeout(meshSafeProperties.getTimeoutSeconds() * 1000);
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conn.setReadTimeout(meshSafeProperties.getTimeoutSeconds() * 1000);
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conn.setDoOutput(true);
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for (Map.Entry<String, String> entry : headers.entrySet()) {
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conn.setRequestProperty(entry.getKey(), entry.getValue());
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}
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try (OutputStream os = conn.getOutputStream()) {
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os.write(bodyBytes);
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}
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int status = conn.getResponseCode();
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byte[] responseBytes;
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try (InputStream is = status >= 400 ? conn.getErrorStream() : conn.getInputStream()) {
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responseBytes = IoUtil.readBytes(is);
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}
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String responseTimestamp = conn.getHeaderField(HEADER_RESPONSE_TIMESTAMP);
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String responseSignature = conn.getHeaderField(HEADER_RESPONSE_SIGNATURE);
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verifyResponseSignature(responseTimestamp, responseSignature, responseBytes);
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String responseBody = new String(responseBytes, StandardCharsets.UTF_8);
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if (status < 200 || status >= 300) {
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log.error("MeshSafe请求失败, method: {}, path: {}, status: {}, response: {}",
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method, path, status, responseBody);
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throw new BusinessException("MeshSafe服务返回异常: HTTP " + status);
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}
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return responseBody;
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} catch (BusinessException e) {
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throw e;
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} catch (Exception e) {
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log.error("MeshSafe请求异常, method: {}, path: {}", method, path, e);
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throw new BusinessException("MeshSafe服务请求失败: " + e.getMessage(), e);
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}
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}
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/**
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* 校验响应签名，验签失败拒绝使用该结论
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*/
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private void verifyResponseSignature(String timestamp, String signature, byte[] responseBytes) {
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if (StringUtils.isBlank(timestamp) || StringUtils.isBlank(signature)) {
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throw new BusinessException("MeshSafe响应缺少签名头，拒绝使用该检测结论");
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}
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byte[] responseKey = deriveKey(INFO_RESPONSE_SIGNING);
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String payload = DigestUtils.sha256Hex(responseBytes) + timestamp;
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String expected = hmacHex(responseKey, payload);
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if (!expected.equalsIgnoreCase(signature)) {
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throw new BusinessException("MeshSafe响应签名校验失败，拒绝使用该检测结论");
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}
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}
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private MeshSafeScanResult parseScanResult(String responseBody) {
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MeshSafeScanResult result = JsonUtils.toObject(responseBody, MeshSafeScanResult.class);
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if (result == null || StringUtils.isBlank(result.getTaskId())) {
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throw new BusinessException("MeshSafe响应解析失败: " + responseBody);
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}
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result.setRawJson(responseBody);
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return result;
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}
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/**
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* 构造请求签名头
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* 待签名串: METHOD \n PATH \n CANONICAL_QUERY \n BODY_SHA256 \n TIMESTAMP \n NONCE \n CLIENT_ID
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*/
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private Map<String, String> signHeaders(String method, String path, byte[] body) {
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String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
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String nonce = UUID.randomUUID().toString().replace("-", "");
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String bodySha256 = DigestUtils.sha256Hex(body);
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String payload = String.join("\n",
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method.toUpperCase(), path, "", bodySha256, timestamp, nonce,
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meshSafeProperties.getClientId());
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String signature = hmacHex(deriveKey(INFO_REQUEST_SIGNING), payload);
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Map<String, String> headers = new LinkedHashMap<>();
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headers.put(HEADER_CLIENT_ID, meshSafeProperties.getClientId());
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headers.put(HEADER_TIMESTAMP, timestamp);
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headers.put(HEADER_NONCE, nonce);
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headers.put(HEADER_BODY_SHA256, bodySha256);
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headers.put(HEADER_SIGNATURE, signature);
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return headers;
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}
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/**
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* HKDF-SHA256 密钥派生(RFC 5869, extract + expand 两步)
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*/
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private byte[] deriveKey(String info) {
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try {
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byte[] ikm = meshSafeProperties.getSecret().getBytes(StandardCharsets.UTF_8);
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byte[] salt = meshSafeProperties.getClientId().getBytes(StandardCharsets.UTF_8);
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Mac mac = Mac.getInstance("HmacSHA256");
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mac.init(new SecretKeySpec(salt, "HmacSHA256"));
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byte[] prk = mac.doFinal(ikm);
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byte[] okm = new byte[32];
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byte[] block = new byte[0];
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int offset = 0;
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byte counter = 1;
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while (offset < okm.length) {
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mac.init(new SecretKeySpec(prk, "HmacSHA256"));
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mac.update(block);
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mac.update(info.getBytes(StandardCharsets.UTF_8));
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mac.update(new byte[]{counter});
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block = mac.doFinal();
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int n = Math.min(block.length, okm.length - offset);
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System.arraycopy(block, 0, okm, offset, n);
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offset += n;
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counter++;
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}
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return okm;
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} catch (Exception e) {
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throw new BusinessException("MeshSafe签名密钥派生失败", e);
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}
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}
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private String hmacHex(byte[] key, String message) {
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try {
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Mac mac = Mac.getInstance("HmacSHA256");
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mac.init(new SecretKeySpec(key, "HmacSHA256"));
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return hex(mac.doFinal(message.getBytes(StandardCharsets.UTF_8)));
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} catch (Exception e) {
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throw new BusinessException("MeshSafe签名计算失败", e);
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}
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}
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private String hex(byte[] bytes) {
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StringBuilder sb = new StringBuilder(bytes.length * 2);
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for (byte b : bytes) {
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sb.append(String.format("%02x", b));
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}
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return sb.toString();
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}
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/**
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* 手工构造 multipart 请求体(签名需基于最终字节计算,不能用HTTP库自动构造)
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*/
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private byte[] buildMultipartBody(String boundary, String fileName, byte[] fileBytes) {
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try {
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ByteArrayOutputStream bos = new ByteArrayOutputStream();
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String channel = StringUtils.defaultIfBlank(meshSafeProperties.getChannel(), "default");
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bos.write(("--" + boundary + "\r\n"
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+ "Content-Disposition: form-data; name=\"channel\"\r\n\r\n"
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+ channel + "\r\n").getBytes(StandardCharsets.UTF_8));
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String safeName = fileName.replace("\"", "");
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bos.write(("--" + boundary + "\r\n"
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+ "Content-Disposition: form-data; name=\"file\"; filename=\"" + safeName + "\"\r\n"
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+ "Content-Type: application/octet-stream\r\n\r\n").getBytes(StandardCharsets.UTF_8));
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bos.write(fileBytes);
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bos.write(("\r\n--" + boundary + "--\r\n").getBytes(StandardCharsets.UTF_8));
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return bos.toByteArray();
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} catch (Exception e) {
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throw new BusinessException("构造MeshSafe检测请求失败", e);
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}
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}
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}
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