使用restful请求https身份不通过, unable to find valid certification path to requested target,使用java生成签名证书

在用spring的RestOperations(顶层类),RestTemplate发送restful请求https(ssl)时候 身份验证失败

因为我们是请求的https格式,服务器端是要求你有签名证书的

第一种解决方法,使用InstallCert.java文件生成

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import java.io.*;
import java.net.URL;

import java.security.*;
import java.security.cert.*;

import javax.net.ssl.*;

public class InstallCert {

public static void main(String[] args) throws Exception {
String host;
int port;
char[] passphrase;
if ((args.length == 1) || (args.length == 2)) {
String[] c = args[0].split(":");
host = c[0];
port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);
String p = (args.length == 1) ? "changeit" : args[1];
passphrase = p.toCharArray();
} else {
System.out.println("Usage: java InstallCert <host>[:port] [passphrase]");
return;
}

File file = new File("jssecacerts");
if (file.isFile() == false) {
char SEP = File.separatorChar;
File dir = new File(System.getProperty("java.home") + SEP
+ "lib" + SEP + "security");
System.out.println(dir);
file = new File(dir, "jssecacerts");
if (file.isFile() == false) {
file = new File(dir, "cacerts");
}
}
System.out.println("Loading KeyStore " + file + "...");
InputStream in = new FileInputStream(file);
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
ks.load(in, passphrase);
in.close();

SSLContext context = SSLContext.getInstance("TLS");
TrustManagerFactory tmf =
TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
tmf.init(ks);
X509TrustManager defaultTrustManager = (X509TrustManager)tmf.getTrustManagers()[0];
SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
context.init(null, new TrustManager[] {tm}, null);
SSLSocketFactory factory = context.getSocketFactory();

System.out.println("Opening connection to " + host + ":" + port + "...");
SSLSocket socket = (SSLSocket)factory.createSocket(host, port);
socket.setSoTimeout(10000);
try {
System.out.println("Starting SSL handshake...");
socket.startHandshake();
socket.close();
System.out.println();
System.out.println("No errors, certificate is already trusted");
} catch (SSLException e) {
System.out.println();
e.printStackTrace(System.out);
}

X509Certificate[] chain = tm.chain;
if (chain == null) {
System.out.println("Could not obtain server certificate chain");
return;
}

BufferedReader reader =
new BufferedReader(new InputStreamReader(System.in));

System.out.println();
System.out.println("Server sent " + chain.length + " certificate(s):");
System.out.println();
MessageDigest sha1 = MessageDigest.getInstance("SHA1");
MessageDigest md5 = MessageDigest.getInstance("MD5");
for (int i = 0; i < chain.length; i++) {
X509Certificate cert = chain[i];
System.out.println
(" " + (i + 1) + " Subject " + cert.getSubjectDN());
System.out.println("   Issuer  " + cert.getIssuerDN());
sha1.update(cert.getEncoded());
System.out.println("   sha1    " + toHexString(sha1.digest()));
md5.update(cert.getEncoded());
System.out.println("   md5     " + toHexString(md5.digest()));
System.out.println();
}

System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");
String line = reader.readLine().trim();
int k;
try {
k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;
} catch (NumberFormatException e) {
System.out.println("KeyStore not changed");
return;
}

X509Certificate cert = chain[k];
String alias = host + "-" + (k + 1);
ks.setCertificateEntry(alias, cert);

OutputStream out = new FileOutputStream("jssecacerts");
ks.store(out, passphrase);
out.close();

System.out.println();
System.out.println(cert);
System.out.println();
System.out.println
("Added certificate to keystore 'jssecacerts' using alias '"
+ alias + "'");
}

private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();

private static String toHexString(byte[] bytes) {
StringBuilder sb = new StringBuilder(bytes.length * 3);
for (int b : bytes) {
b &= 0xff;
sb.append(HEXDIGITS[b >> 4]);
sb.append(HEXDIGITS[b & 15]);
sb.append(' ');
}
return sb.toString();
}

private static class SavingTrustManager implements X509TrustManager {

private final X509TrustManager tm;
private X509Certificate[] chain;

SavingTrustManager(X509TrustManager tm) {
this.tm = tm;
}

public X509Certificate[] getAcceptedIssuers() {
throw new UnsupportedOperationException();
}

public void checkClientTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
throw new UnsupportedOperationException();
}

public void checkServerTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
this.chain = chain;
tm.checkServerTrusted(chain, authType);
}
}

}

保存成InstallCert.java,编译InstallCert,运行

java InstallCert host:port

例子

java InstallCert www.baidu.com

默认会去从443端口下证书,如果不成功需要我们自己制定

java InstallCert 域名:端口

出现 Enter certificate to add to trusted keystore or ‘q’ to quit: [1]输入

1

会生成一个jssecacerts这就是你所谓的证书了,生成后需要注意几个参数会打印出来 Subject和 Issuer还有Added certificate to keystore ‘jssecacerts’ using alias ‘alias(名称) ‘最重要

第二种解决方法

keytool -genkeypair -alias "server" -keyalg "RSA" -keystore "jssecacerts.keystore"

他需要你填写一系列的东西

功能：

创建一个别名为server的证书，该证书存放在名为test.keystore的密钥库中，若jssecacerts.keystore密钥库不存在则创建。

参数说明：

genkeypair：生成一对非对称密钥;

-alias：指定密钥对的别名，该别名是公开的;

-keyalg：指定加密算法，本例中的采用通用的RAS加密算法;

-keystore:密钥库的路径及名称，不指定的话，默认在操作系统的用户目录下生成一个”.keystore”的文件

密钥库的密码至少必须6个字符，可以是纯数字或者字母或者数字和字母的组合等等,自己指定

“名字与姓氏”应该是输入域名，而不是我们的个人姓名，其他的可以不填

这里填写的就是subject打印的

经过以上的两种方法其中的一种我们生成了秘钥

接下来对证书的操作

keytool -list -keystore jssecacerts

查看密钥库里面的证, 不出意外的话会有很多证书指纹

keytool -list -keystore jssecacerts | grep /i ***alias(名称)***

查找我们自己的

keytool -export -alias ***alias(名称)***  -file Server.crt -keystore jssecacerts

会在当前目录生成Server.crt

导入到java的认证文件夹下

keytool -import -file Server.cer -keystore "%JAVA_HOME%\jre\lib\security\cacerts" -alias server

使用如下命令可以看到结果：

keytool -list -keystore "%JAVA_HOME%\jre\lib\security\cacerts" | grep  Server

到这里签名证书制作完成了就可以使用restful请求https服务了,