cas根据请求参数跳过验证

接上一篇 https://birdzhang.xyz/2018/05/15/Java%E6%94%B9%E5%86%99HttpServletRequest%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0/ ,这里说一下cas的坑(这里的cas是3.5版本)

虽然cas有CAS Authentication Filter,但是这个只是根据请求的uri过滤的,那么这里就出现了一个奇怪的bug

即使我在excludePaths里面添加了/test1/,但是当请求地址为/test1/123?ticket=123的时候,还是会去cas服务器验证!!!

我们来看代码:

CAS Authentication Filter 代码
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package com.birdzhang.demo.check;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.jasig.cas.client.authentication.DefaultGatewayResolverImpl;
import org.jasig.cas.client.authentication.GatewayResolver;
import org.jasig.cas.client.util.AbstractCasFilter;
import org.jasig.cas.client.util.CommonUtils;
import org.jasig.cas.client.validation.Assertion;

public class AuthenticationFilter extends AbstractCasFilter{


/**
* The URL to the CAS Server login.
*/
private String casServerLoginUrl;

/**
* Whether to send the renew request or not.
*/
private boolean renew = false;

/**
* Whether to send the gateway request or not.
*/
private boolean gateway = false;
/**
* 添加属性,这里用来存放不过滤地址正则表达式,可以根据自己需求定制---1
*/
private String excludePaths;

private GatewayResolver gatewayStorage = new DefaultGatewayResolverImpl();

protected void initInternal(final FilterConfig filterConfig) throws ServletException {
if (!isIgnoreInitConfiguration()) {
super.initInternal(filterConfig);
setCasServerLoginUrl(getPropertyFromInitParams(filterConfig, "casServerLoginUrl", null));
//log.trace("Loaded CasServerLoginUrl parameter: " + this.casServerLoginUrl);
setRenew(parseBoolean(getPropertyFromInitParams(filterConfig, "renew", "false")));
//log.trace("Loaded renew parameter: " + this.renew);
setGateway(parseBoolean(getPropertyFromInitParams(filterConfig, "gateway", "false")));
//log.trace("Loaded gateway parameter: " + this.gateway);

final String gatewayStorageClass = getPropertyFromInitParams(filterConfig, "gatewayStorageClass", null);

if (gatewayStorageClass != null) {
try {
this.gatewayStorage = (GatewayResolver) Class.forName(gatewayStorageClass).newInstance();
} catch (final Exception e) {
//log.error(e,e);
throw new ServletException(e);
}
}
//自定义添加代码,用来读取web配置文件中excludes属性值 ---2
excludePaths = getPropertyFromInitParams(filterConfig, "excludePaths", null);//filterConfig.getInitParameter("excludePaths");
excludePaths = excludePaths.trim();
}
}

public void init() {
super.init();
CommonUtils.assertNotNull(this.casServerLoginUrl, "casServerLoginUrl cannot be null.");
}
//url判断逻辑,这里大家可以根据自己需要来制订规则
private boolean isExclude(String uri){
boolean isInWhiteList = false;
if(excludePaths!=null&& uri!=null){
isInWhiteList = uri.matches(excludePaths);
}
return isInWhiteList;
}


public final void doFilter(final ServletRequest servletRequest, final ServletResponse servletResponse, final FilterChain filterChain) throws IOException, ServletException {
final HttpServletRequest request = (HttpServletRequest) servletRequest;
final HttpServletResponse response = (HttpServletResponse) servletResponse;
final HttpSession session = request.getSession(false);
final Assertion assertion = session != null ? (Assertion) session.getAttribute(CONST_CAS_ASSERTION) : null;
// 该判断是自定义的对符合条件的url进行通过处理 ---3
if(isExclude(request.getRequestURI())){
filterChain.doFilter(request, response);
return;
}

if (assertion != null) {
filterChain.doFilter(request, response);
return;
}

final String serviceUrl = constructServiceUrl(request, response);
final String ticket = CommonUtils.safeGetParameter(request,getArtifactParameterName());
final boolean wasGatewayed = this.gatewayStorage.hasGatewayedAlready(request, serviceUrl);

if (CommonUtils.isNotBlank(ticket) || wasGatewayed) {
filterChain.doFilter(request, response);
return;
}

final String modifiedServiceUrl;

//log.debug("no ticket and no assertion found");
if (this.gateway) {
//log.debug("setting gateway attribute in session");
modifiedServiceUrl = this.gatewayStorage.storeGatewayInformation(request, serviceUrl);
} else {
modifiedServiceUrl = serviceUrl;
}

/* if (log.isDebugEnabled()) {
log.debug("Constructed service url: " + modifiedServiceUrl);
}*/

final String urlToRedirectTo = CommonUtils.constructRedirectUrl(this.casServerLoginUrl, getServiceParameterName(), modifiedServiceUrl, this.renew, this.gateway);

/* if (log.isDebugEnabled()) {
log.debug("redirecting to \"" + urlToRedirectTo + "\"");
}*/

response.sendRedirect(urlToRedirectTo);
}

public final void setRenew(final boolean renew) {
this.renew = renew;
}

public final void setGateway(final boolean gateway) {
this.gateway = gateway;
}

public final void setCasServerLoginUrl(final String casServerLoginUrl) {
this.casServerLoginUrl = casServerLoginUrl;
}

public final void setGatewayStorage(final GatewayResolver gatewayStorage) {
this.gatewayStorage = gatewayStorage;
}
}

可以看到在uri匹配到excludepath之后会走filterChain.doFilter(request, response);,由于我们并没有对filterChain做什么修改,所以最终还是跑到cas那里去了

修改后的代码如下:

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package com.birdzhang.plugin;

/**
* @author debo.zhang
*
*/
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.jasig.cas.client.authentication.DefaultGatewayResolverImpl;
import org.jasig.cas.client.authentication.GatewayResolver;
import org.jasig.cas.client.util.AbstractCasFilter;
import org.jasig.cas.client.util.CommonUtils;
import org.jasig.cas.client.validation.Assertion;

public class AuthenticationFilter extends AbstractCasFilter{


/**
* The URL to the CAS Server login.
*/
private String casServerLoginUrl;

/**
* Whether to send the renew request or not.
*/
private boolean renew = false;

/**
* Whether to send the gateway request or not.
*/
private boolean gateway = false;
/**
* 添加属性,这里用来存放不过滤地址正则表达式,可以根据自己需求定制---1
*/
private String excludePaths;

private GatewayResolver gatewayStorage = new DefaultGatewayResolverImpl();

protected void initInternal(final FilterConfig filterConfig) throws ServletException {
if (!isIgnoreInitConfiguration()) {
super.initInternal(filterConfig);
setCasServerLoginUrl(getPropertyFromInitParams(filterConfig, "casServerLoginUrl", null));
//log.trace("Loaded CasServerLoginUrl parameter: " + this.casServerLoginUrl);
setRenew(parseBoolean(getPropertyFromInitParams(filterConfig, "renew", "false")));
//log.trace("Loaded renew parameter: " + this.renew);
setGateway(parseBoolean(getPropertyFromInitParams(filterConfig, "gateway", "false")));
//log.trace("Loaded gateway parameter: " + this.gateway);

final String gatewayStorageClass = getPropertyFromInitParams(filterConfig, "gatewayStorageClass", null);

if (gatewayStorageClass != null) {
try {
this.gatewayStorage = (GatewayResolver) Class.forName(gatewayStorageClass).newInstance();
} catch (final Exception e) {
//log.error(e,e);
throw new ServletException(e);
}
}
//自定义添加代码,用来读取web配置文件中excludes属性值 ---2
excludePaths = getPropertyFromInitParams(filterConfig, "excludePaths", null);//filterConfig.getInitParameter("excludePaths");
excludePaths = excludePaths.trim();
}
}

public void init() {
super.init();
CommonUtils.assertNotNull(this.casServerLoginUrl, "casServerLoginUrl cannot be null.");
}

//url判断逻辑,这里大家可以根据自己需要来制订规则
private boolean isExclude(String uri){
boolean isInWhiteList = false;
if(excludePaths!=null&& uri!=null){
isInWhiteList = uri.matches(excludePaths);
}
return isInWhiteList;
}



public final void doFilter(final ServletRequest servletRequest, final ServletResponse servletResponse, final FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) servletRequest;
final HttpServletResponse response = (HttpServletResponse) servletResponse;
final HttpSession session = request.getSession(false);

final Assertion assertion = session != null ? (Assertion) session.getAttribute(CONST_CAS_ASSERTION) : null;

//hack for 云桥
Map<String, String[]> paramsMap = request.getParameterMap();

if(null != paramsMap ) {
if(paramsMap.containsKey("ticket") && paramsMap.containsKey("operation")) {
/* String token = Arrays.toString(paramsMap.get("ticket"));
request.removeAttribute("ticket");
request.setAttribute("token", token.substring(1, token.length()-1));
filterChain.doFilter(request, response);
return;*/

/*StringBuffer paramsBuff = new StringBuffer();
for(String param: paramsMap.keySet()) {
String newString = Arrays.toString(paramsMap.get(param));
if(param.equals("ticket")) {
paramsBuff.append("&").append("eticket").append("=").append(newString.substring(1, newString.length()-1));
}else {
paramsBuff.append("&").append(param).append("=").append(newString.substring(1, newString.length()-1));
}
}
String port = request.getServerPort() == 80?"":":"+request.getServerPort();
String scheme = request.getScheme();
String host = request.getServerName();
String redirectUrl = String.format("%s://%s%s%s?%s",
scheme,
host,
port,
request.getRequestURI(),
paramsBuff.toString().substring(1)
);
System.out.println("request url:"+redirectUrl);
response.sendRedirect(redirectUrl);
return;*/

Map<String, String[]> extraParams = new HashMap<String, String[]>();
HttpServletRequest wrappedRequest = new PrettyFacesWrappedRequest(request, extraParams);
request.getRequestDispatcher(request.getRequestURI()).forward(wrappedRequest, response);
return;
}
}


// 该判断是自定义的对符合条件的url进行通过处理
if(isExclude(request.getRequestURI())){
filterChain.doFilter(request, response);
return;
}



if (assertion != null) {
filterChain.doFilter(request, response);
return;
}

final String serviceUrl = constructServiceUrl(request, response);
final String ticket = CommonUtils.safeGetParameter(request,getArtifactParameterName());
final boolean wasGatewayed = this.gatewayStorage.hasGatewayedAlready(request, serviceUrl);

if (CommonUtils.isNotBlank(ticket) || wasGatewayed) {
filterChain.doFilter(request, response);
return;
}

final String modifiedServiceUrl;

//log.debug("no ticket and no assertion found");
if (this.gateway) {
//log.debug("setting gateway attribute in session");
modifiedServiceUrl = this.gatewayStorage.storeGatewayInformation(request, serviceUrl);
} else {
modifiedServiceUrl = serviceUrl;
}

/* if (log.isDebugEnabled()) {
log.debug("Constructed service url: " + modifiedServiceUrl);
}*/

final String urlToRedirectTo = CommonUtils.constructRedirectUrl(this.casServerLoginUrl, getServiceParameterName(), modifiedServiceUrl, this.renew, this.gateway);

/* if (log.isDebugEnabled()) {
log.debug("redirecting to \"" + urlToRedirectTo + "\"");
}*/

response.sendRedirect(urlToRedirectTo);
}

public final void setRenew(final boolean renew) {
this.renew = renew;
}

public final void setGateway(final boolean gateway) {
this.gateway = gateway;
}

public final void setCasServerLoginUrl(final String casServerLoginUrl) {
this.casServerLoginUrl = casServerLoginUrl;
}

public final void setGatewayStorage(final GatewayResolver gatewayStorage) {
this.gatewayStorage = gatewayStorage;
}
}

Java改写HttpServletRequest请求参数

为什么会有这个需求呢? 因为被 casAuthenticationFilter坑了

下一篇再说一下AuthenticationFilter的坑,这里主要说修改请求的参数

代码是从网上找的,找不到具体来源了,直接贴代码吧

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package com.birdzhang.plugin;

import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;


/**
* @author birdzhang
*
*/
public class PrettyFacesWrappedRequest extends HttpServletRequestWrapper
{
private final Map<String, String[]> modifiableParameters;
private Map<String, String[]> allParameters = null;

/**
* Create a new request wrapper that will merge additional parameters into
* the request object without prematurely reading parameters from the
* original request.
*
* @param request
* @param additionalParams
*/
public PrettyFacesWrappedRequest(final HttpServletRequest request,
final Map<String, String[]> additionalParams)
{
super(request);
modifiableParameters = new HashMap<String, String[]>();
modifiableParameters.putAll(additionalParams);
}

@Override
public String getParameter(final String name)
{
String[] strings = getParameterMap().get(name);
if (strings != null)
{
return strings[0];
}
return super.getParameter(name);
}

@Override
public Map<String, String[]> getParameterMap()
{
if (allParameters == null)
{
allParameters = new TreeMap<String, String[]>();
Map<String, String[]> superMap = super.getParameterMap();
// 在这里根据你的需要修改
for (String key : superMap.keySet()) {
if(key.equals("ticket")) {
allParameters.put("token", superMap.get(key));
}else {
allParameters.put(key, superMap.get(key));
}
}
allParameters.putAll(modifiableParameters);
}
//Return an unmodifiable collection because we need to uphold the interface contract.
return Collections.unmodifiableMap(allParameters);
}

@Override
public Enumeration<String> getParameterNames()
{
return Collections.enumeration(getParameterMap().keySet());
}

@Override
public String[] getParameterValues(final String name)
{
return getParameterMap().get(name);
}
}

使用:

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Map<String, String[]> extraParams = new HashMap<String, String[]>();
HttpServletRequest wrappedRequest = new PrettyFacesWrappedRequest(request, extraParams);
request.getRequestDispatcher(request.getRequestURI()).forward(wrappedRequest, response);
return;

完美的将ticket参数替换为token参数