一般项目绝大数都是部署于某一个网络,要吗在内网,要不在外网,部署在内网的目前很多都通过VPN进行内网的访问。但对于一些项目是部署在内网,然后通过网络路由映射方式进行外网的访问,一般情况如果是通过自己开发的登陆此问题不需要进行任何改动,而当您使用了通用的CAS统一认证服务时,由于WEB应用工程中 web.xml配置的CAS地址是固定的,而不是一个动态的地址,当将WEB应用服务器例如TOMCAT端口映射外网后,在访问应用时会自动根据在web.xml文件中去配置对应的CAS地址,而此时的地址只能是内网使用,外网自然无法找到,则无法登陆,而由于项目的本身需要,必须要同时内外网都能访问,而应用已使用了CAS再来变更带来一些不便,同时CAS统一认证方面安全性还是较为有优势的,根据这一情况,前期进行了大量的咨询,都没能找得很好的解决办法,对于公司内部也无人能够解决,后通过百度搜索到了大量信息,并进行了测试,发现很多都无法满足自己的需要,后在无意中发现CNBlogs的一位作者名为BetterFuture的在自己博文中对CAS内外网功能的一个介绍,但由于没有进行全部的解说和一些代码的问题,并未能成功解决,后联系上了作者,并在其指导下完成自己的项目内网外功能,在此本人根据自己项目的情况进行了一次总结,以便于帮助更多的人;本案例以CAS-Client-3.2.1为例进行说明,对应的服务端为对应CAS-Server-4.0上,其不同版本源码虽有所改变,但此方法仍适用。
1)在org.jasig.cas.client.util下继续新增工具类PropertiesUtil代码如下:
package org.jasig.cas.client.util;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
public class PropertiesUtil {
public static Map readProperties(String path) {
Map map = new HashMap<>();
try {
Properties props = new Properties();
props.load(new FileInputStream(path));
Enumeration> enum1 = props.propertyNames();
while(enum1.hasMoreElements()) {
String strKey = (String) enum1.nextElement();
String strValue = props.getProperty(strKey);
map.put(strKey, strValue);
}
} catch (IOException e) {
e.printStackTrace();
}
return map;
}
}
2)在org.jasig.cas.client.util下继续新增工具类HttpConnectionUtil 代码如下:
package org.jasig.cas.client.util;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;
public class HttpConnectionCustom{
/**
* 测试网络是否能连接通畅
*/
public static boolean isConnection(String serviceURL) {
try {
URL url = new URL(serviceURL);
HttpURLConnection connection =(HttpURLConnection) url.openConnection();
connection.setConnectTimeout(2000);//2s超时
connection.setReadTimeout(2000);
int state = connection.getResponseCode();
if(state == 200) {
return true;
}else {
return false;
}
}catch (Exception e) {
return false;
}
}
/**
* 测试ip是否有效
* @param ipSection
* @param ip
* @return
*/
public static boolean ipIsValid(String ipSection, String ip){
if(ipSection == null){
throw new NullPointerException("IP段不能为空!");
}
if(ip ==null) {
throw new NullPointerException("IP不能为空!");
}
ipSection = ipSection.trim();
ip = ip.trim();
final String REGX_IP = "((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)\\.){3}(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)";
final String REGX_IPB = REGX_IP + "\\-" + REGX_IP;
if(!ipSection.matches(REGX_IPB) || !ip.matches(REGX_IP)){return false;}
int idx = ipSection.indexOf('-');
String[] sips = ipSection.substring(0, idx).split("\\.");
String[] sipe = ipSection.substring(idx+1).split("\\.");
String[] sipt = ip.split("\\.");
long ips = 0L, ipe = 0L, ipt = 0L;
for (int i = 0; i < 4; ++i) {
ips = ips << 8 | Integer.parseInt(sips[i]);
ipe = ipe << 8 | Integer.parseInt(sipe[i]);
ipt = ipt << 8 | Integer.parseInt(sipt[i]);
}
if(ips > ipe){
long t = ips;ips = ipe;ipe = t;
}
return ips <= ipt && ipt <= ipe;
}
/**
* 获取配置文件信息
*
* @return
*/
public static Map getServiceUrlMap() {
return PropertiesUtil.readProperties(HttpConnectionCustom.class.getResource("/").getPath() + "cas-service.properties");
}
}
3)在org.jasig.cas.client.util下继续新增工具类CustomConfigUtil,代码为:
package org.jasig.cas.client.util;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
public class CustomConfigUtil {
/**
* @Description 获取属性文件中的属性信息
* @return
*/
public static Map getCustomConfig( final ServletContext servletContext,final HttpServletRequest request) {
Map map = new HashMap<>();
Map map2 = HttpConnectionCustom.getServiceUrlMap();
//读取配置文件
Map segmentMap = PropertiesUtil.readProperties(CustomConfigUtil.class.getResource("/").getPath() + "segment.properties");
boolean falg = false;
//获取外网请求nginx客户端的IP
String IP = request.getHeader("X-Forwarded-For");
if(IP==null) {
//获取nginx负载均衡后的IP
IP = request.getRemoteAddr();
};
for (String key : segmentMap.keySet()) {
//判断是否属于某个网段
falg = HttpConnectionCustom.ipIsValid(segmentMap.get(key),IP);
if(falg){
break;
}
}
// 判断请求是从外网访问还是从内网访问
if (falg) {
//client客户端地址
map.put("client", map2.get("cas.inClient"));
//cas服务器地址
map.put("casServerTicketUrl", map2.get("cas.inCasServer"));
//cas服务器地址
map.put("casServerTicket", map2.get("cas.inCasServerTicket"));
} else {
//client客户端地址
map.put("client", map2.get("cas.outClient"));
//cas服务器地址
map.put("casServerTicketUrl", map2.get("cas.outCasServer"));
//cas服务器地址
map.put("casServerTicket", map2.get("cas.outCasServerTicket"));
}
return map;
}
}
4)、完成上述源代码的增加工具类后,开始修改CAS中的源代码了,首先修改AuthenticationFilte ,添加静态属性:
public static final String CONST_CAS_GATEWAY = "_const_cas_gateway_";
然后找到方法:doFilter 方法内容修改为:
public final void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest)servletRequest;
HttpServletResponse response = (HttpServletResponse)servletResponse;
HttpSession session = request.getSession(false);
Assertion assertion = session != null ? (Assertion)session.getAttribute("_const_cas_assertion_") : null;
if (assertion != null) {
filterChain.doFilter(request, response);
return;
}
//ignoreUrl跳出filter
String requestUrl = request.getRequestURI().toString();
this.log.info("requestUrl==========="+requestUrl);
PathMatcher matcher = new AntPathMatcher();
if(ignoreUrlArray != null){
for(String ignoreUrl : ignoreUrlArray){
boolean flag = matcher.match(requestUrl,ignoreUrl);
if(!flag){
flag = requestUrl.indexOf(ignoreUrl)>0;
}
if(flag){
this.log.info("ignoreUrl========= " + ignoreUrl + "====== pass sso authentication");
filterChain.doFilter(request, response);
return;
}
}
}
String serviceUrl = constructServiceUrl(request, response,"auth");
String ticket = CommonUtils.safeGetParameter(request, getArtifactParameterName());
boolean wasGatewayed = this.gatewayStorage.hasGatewayedAlready(request, serviceUrl);
if ((CommonUtils.isNotBlank(ticket)) || (wasGatewayed)) {
filterChain.doFilter(request, response);
return;
}
this.log.debug("no ticket and no assertion found");
String modifiedServiceUrl;
if (this.gateway) {
this.log.debug("setting gateway attribute in session");
modifiedServiceUrl = this.gatewayStorage.storeGatewayInformation(request, serviceUrl);
} else {
modifiedServiceUrl = serviceUrl;
}
if (this.log.isDebugEnabled()) {
this.log.debug("Constructed service url: " + modifiedServiceUrl);
}
Map config = CustomConfigUtil.getCustomConfig(request.getServletContext(),request);
String casServerLoginUrls = config.get("casServerTicketUrl");
String urlToRedirectTo = CommonUtils.constructRedirectUrl(casServerLoginUrls, getServiceParameterName(), modifiedServiceUrl, this.renew, this.gateway);
if (this.log.isDebugEnabled()) {
this.log.debug("redirecting to \"" + urlToRedirectTo + "\"");
}
response.sendRedirect(urlToRedirectTo);
}
5)、由于修改了constructServiceUrl这个方法,增加了一个参数,由原来该方法只有两个参数 现在修改为3个,需要找到该方法的类AbstractCasFilter(源代码的第 113或114行中的constructServiceUrl方法)进行修改重载该方法:
protected final String constructServiceUrl(final HttpServletRequest request, final HttpServletResponse response,final String type) {
Map config = CustomConfigUtil.getCustomConfig(request.getServletContext(),request);
if("auth".equals(type)){
this.serverName = config.get("client").toString();
this.service = config.get("client").toString();
}else if("validation".equals(type)){
this.serverName = config.get("casServerTicket").toString();
this.service = config.get("client").toString();
}
return CommonUtils.constructServiceUrl(request, response, this.service, this.serverName, this.artifactParameterName, this.encodeServiceUrl);
}
6)、由于该方法在其他几处也有调用,故而需要对其他调用的地方进行一一修改,但其他调用处最后Type的参数都统一修改成“validation”,“auth”仅上述AuthenticationFilte方法中的doFilter中使用,具体涉及到的类分别为:AbstractTicketValidationFilter中doFilter方法第169和184行constructServiceUrl方法的调用,增加“validation”参数即可,同时测试类CasFilterTests中也需要进行修改,参数同样为“validation”,具体代码如下:
constructServiceUrl(request, response,"validation")
到此已完成了CAS-Client-core源代码的修改.
7)、完成上述源代码的增加与修改后,进行编译打成cas-client-core- 3.2.1.jar包,分别放置于cas工程以及调用cas的其他WEB应用工程中,同时需要在调用cas的WEB应用工程中增加两个配置文件,分别为: cas-service.properties与segment.properties。
7.1、cas-service.properties配置文件内容如下:
#cas服务端的内网和外网
cas.inCasServer=http://10.206.20.52:8982/cas
cas.outCasServer=http://218.6.169.98:18982/cas
#调用cas的其他WEB应用的内网和外网
cas.inClient=http://10.206.20.52:8982/tickets
cas.outClient=http://218.6.169.98:18982/tickets
#cas服务端的内网和外网(casTicket)
cas.inCasServerTicket=http://10.206.20.52:8982/cas
cas.outCasServerTicket=http://218.6.169.98:18982/cas
2、segment.properties配置文件内容如下:
#网段
segment_1 =10.0.0.0-10.255.255.255
segment_2 =172.16.0.0-172.31.255.255
segment_3 =192.168.0.0-192.168.255.255
segment_4 =172.10.0.0-172.31.255.255
注:此处网段只需要配置内网的限制IP,也就是出现在此配置文件中的内网IP才可以访问,外网无须配置;另WEB.xml配置的cas服务地址将不再有效,处于失效状态,而是通过这两个配置文件进行读取,但web.xml配置的信息依然需要保留。
犹豫nginx重定向问题,容易把url端口号省略,故在nginx.conf配置中,需要重定向配置,内容如下:
location / {
port_in_redirect on;
#外网
proxy_redirect http://183.129.XXX.XXX/ http://183.129.XXX.XXX:1280/;
#内网
proxy_redirect http://192.168.1.XXX/ http://192.168.1.XXX:80/;
proxy_pass http://myserver;
proxy_next_upstream http_404 non_idempotent http_500 error timeout http_502;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
index index.html index.htm;
root html;
}