内测之家-安全机制-署名（二）
内测之家-安全机制-署名（一）简要的先容了署名的大致情况本章先容的是署名的实现细节
HTTP请求参与署名（需要被保护，防止被篡改的信息）的信息布局：
public class HttpSignatureRawData {
/**
* 方式
*/
private String method;
/**
* 路径加请求参数
*/
private String uri;
/**
* url QueryString参数
*/
private MultiValueMap<String, String> parameters;
/**
* headers
*/
private MultiValueMap<String, String> headers;
/**
* 数据体
*/
private byte[] body;
/**
* 密钥
*/
private String secret;
public void setHeaders(MultiValueMap<String, String> headers, List<String> includeTags){
if (includeTags != null && includeTags.size() > 0) {
if (headers != null && headers.size() > 0) {
MultiValueMap<String, String> includeHeaders = new LinkedMultiValueMap<>();
includeTags.forEach(key -> {
final List<String> values = headers.get(key);
includeHeaders.put(key, values);
});
this.headers = includeHeaders;
}
}
}
public void setParameters(MultiValueMap<String, String> params, List<String> excludeTags) {
if (params != null && params.size() > 0){
if (excludeTags != null && excludeTags.size() > 0){
excludeTags.forEach(params::remove);
}
}
this.parameters = params;
}
public void setParameters(Map<String, String[]> params, List<String> excludeTags){
if (params == null || params.size() ==0 ){
return;
}
MultiValueMap<String,String> parameters = new LinkedMultiValueMap(8) {};
params.forEach((item,value) ->{
parameters.put(item, Arrays.asList(value));
});
// 设置排除 参与签名的参数（query）
Optional.ofNullable(excludeTags).ifPresent(value->{
parameters.remove(value);
});
this.parameters = parameters;
}
}method: 请求方式（GET、POST、PUT等）
URI：只包罗PATH
parameters: 为 QueryString 的 Key=Value 包罗的信息是需要参与署名的查询参数
headers: 为请求头的Key:Value 包罗的信息是需要参与署名的请求头
body: 请求体
secret: APPKey 对应的密钥， 该信息只参与署名或验签、不会进行传输
构建【署名内容】实现如下:
public class DefaultHttpSignatureContentBuilder implements HttpSignatureContentBuilder {
//换行符
private static String LF = "\n";
//回车换行
private static String CRLF = "\r\n";
private static String COLON = ":";
/** HTTP HEADER是否转换成小写（部分WEB容器中接受到的所有HEADER的KEY都是小写）**/
private static final boolean HTTP_HEADER_TO_LOWER_CASE = true;
private HttpSignatureElement httpSignatureElement;
public DefaultHttpSignatureContentBuilder(HttpSignatureElement httpSignatureElement) {
this.httpSignatureElement = httpSignatureElement;
}
@Override
public String getResult(HttpSignatureRawData rawData) {
if (rawData != null) {
StringBuilder builder = new StringBuilder();
this.buildMethod(builder, rawData.getMethod());
this.buildUri(builder, rawData.getUri());
this.buildParameters(builder, rawData.getParameters());
this.buildHeaders(builder, rawData.getHeaders());
this.buildBody(builder, rawData.getBody());
this.buildSecret(builder, rawData.getSecret());
return builder.toString();
}
return null;
}
public HttpSignatureContentBuilder buildUri(StringBuilder builder, String uri) {
appendItem(builder, uri, this.httpSignatureElement.getUriTag());
return this;
}
public HttpSignatureContentBuilder buildMethod(StringBuilder builder, String method) {
appendItem(builder, method, this.httpSignatureElement.getMethodTag());
return this;
}
public HttpSignatureContentBuilder buildHeaders(StringBuilder builder, MultiValueMap<String, String> headers) {
/** 【有】参与加签的请求头 **/
List<String> includeHeaders = httpSignatureElement.getIncludeHeaderTags();
if (includeHeaders != null && headers != null && headers.size() > 0) {
LinkedMultiValueMap candidateHeaders = new LinkedMultiValueMap<>(8);
for (String includeHeader : includeHeaders) {
final List<String> values = headers.get(includeHeader);
if (values != null){
/** 因为http请求头不区分大小写 ,统一转为小写 **/
candidateHeaders.put(HTTP_HEADER_TO_LOWER_CASE ? includeHeader.toLowerCase() : includeHeader, values);
}
}
/**
* 形式如下: HeaderKey1.toLowerCase() 因为http请求头不区分大小写
* String headers = HeaderKey1.toLowerCase() + ":" + HeaderValue1 +"\n"+
*HeaderKey2.toLowerCase() + ":" + HeaderValue2 +"\n"+
*... +
* HeaderKeyN.toLowerCase() + ":" + HeaderValueN + "\n"
*/
String headerString = LinkStringMultiValueKit.instance.createLinkString(candidateHeaders, LF, COLON, this.httpSignatureElement.getHeadersTag()).toString();
appendItem(builder, headerString, this.httpSignatureElement.getHeadersTag());
}
return this;
}
public HttpSignatureContentBuilder buildParameters(StringBuilder builder, MultiValueMap<String, String> parameters) {
if (parameters != null && parameters.size() > 0){
MultiValueMap<String, String> candidateParameters = parameters;
/** 【不】参与加签的 queryString **/
List<String> excludeQueryItems = httpSignatureElement.getExcludeParameterTags();
if (excludeQueryItems != null && excludeQueryItems.size() > 0){
candidateParameters = new LinkedMultiValueMap<>(parameters);
for (String excludeQueryItem : excludeQueryItems) {
parameters.remove(excludeQueryItem);
}
}
String parameterString = LinkStringMultiValueKit.instance.createDefaultLinkString(candidateParameters, this.httpSignatureElement.getParametersTag()).toString();
appendItem(builder, parameterString, this.httpSignatureElement.getParametersTag());
}
return this;
}
public HttpSignatureContentBuilder buildBody(StringBuilder builder, byte[] body) {
if (body != null) {
String bodyString = new String(body);
appendItem(builder, bodyString, this.httpSignatureElement.getBodyTag());
}
return this;
}
public HttpSignatureContentBuilder buildSecret(StringBuilder builder, String secret) {
appendItem(builder, secret, this.httpSignatureElement.getAppSecretTag());
return this;
}
protected void appendItem(StringBuilder builder, String itemValue, String tag) {
if (itemValue != null && !itemValue.isEmpty()) {
builder.append(tag);
builder.append(COLON);
builder.append(itemValue);
builder.append(CRLF);
}
}
}
署名的对象定义：
@Data
public class SignatureEntity {
/**
* 应用的AK
*/
@NotBlank
protected String appKey;
/**
* 版本
*/
@NotBlank
protected String version;
/**
* 签名 不参与加签
*/
@NotBlank
protected String signature;
/**
* unix时间(国际时间 有区域的 毫秒级)
*/
@NotNull
protected Long timestamp;
/**
* 唯一值n
* 长度不能超过256个字符
* 请求唯一标识， appKey+nonce 不能重复，与时间戳结合使用才能起到防重放作用。
*/
@NotBlank
@Size(max = 256)
protected String nonce;
/**
*bizContent 是由 DefaultApiHttpServletSignatureContentDirector->buildRequest 构建而成的
**/
@NotBlank
protected String bizContent;
}
验签过程：
public boolean verify(Map<String, String> mapParam, HttpSignatureElement httpSignatureElement, IAppSignatureConfig signatureConfig){
SignatureResponseCodeEnum.SIGNATURE_CONFIG_NOT_EXIST.assertNotNull(signatureConfig);
String timeStampString= mapParam.get(httpSignatureElement.getTimestampTag());
long timeStamp = 0;
if (StringUtils.isNotBlank(timeStampString)){
timeStamp = Long.valueOf(timeStampString);
}
String signature = mapParam.get(httpSignatureElement.getSignatureTag());
String nonce = mapParam.get(httpSignatureElement.getNonceTag());
String contentString = mapParam.get(httpSignatureElement.getBizContentTag());
/**
* 纯粹的 时间戳有效性判断，对于过期的，可快速的过滤，从而提高性能
* 性能损耗（小）
* 第一步：再验证timestamp是否过期，证明请求是在最近60s被发出的
**/
boolean bAccess = this.isExpired(timeStamp, getValidityPeriod());
SignatureResponseCodeEnum.SIGNATURE_VERIFY_TIMESTAMP_ERROR.assertIsFalse(bAccess);
//////////////////////////////////////////////////////////////////////////
/** 获取LinkString **/
/** 对方的公钥验 **/
String peerVerifyKey = signatureConfig.fetchVerifyKeyString();
/** 配置的签名算法类型 **/
String signType = signatureConfig.fetchAlgorithm();
/** 根据签名类型，获取签名服务 **/
SignValidateInterface service = HttpServletSignatureUtils.fetchSignValidateService(signType);
SignatureResponseCodeEnum.SIGNATURE_TYPE_NOT_SERVICE_SUPPORT.assertNotNull(service);
/**
* 通过算法进行校验，
* 性能损耗（中）
* 第二步：先验证sign签名是否合理，证明请求参数没有被中途篡改
**/
bAccess = service.verify(contentString, CHARSET, signature, peerVerifyKey, signType);
if (!bAccess){
logger.error("signedContent:"+ contentString);
}
SignatureResponseCodeEnum.SIGNATURE_VERIFY_ERROR.assertIsTrue(bAccess);
/**
* 放在第三步， 可以有效的减少 通讯 如（redis 或 zookeeper等 缓存服务）
* 如 【一直重入提交相同的数据】
* 性能损耗（高）
* 第三步：最后验证nonce是否已经有了，证明这个请求不是VALIDITY_PERIOD秒内的重放请求
* **/
String appKey = mapParam.get(httpSignatureElement.getAppKeyTag());
String nonceKey = buildNonceKey(appKey, nonce);
bAccess = this.verifyNonce(nonceKey, getValidityPeriod()+PERIOD_OFFSET);
SignatureResponseCodeEnum.SIGNATURE_VERIFY_NONCE_ERROR.assertIsTrue(bAccess);
return true;
}
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