解決PKIX(PKIX path building failed) 問題 unable to find valid certification path to requested target，certification

解決PKIX(PKIX path building failed) 問題 unable to find valid certification path to requested target，certification

最近在寫java的一個服務，需要給遠程服務器發送post請求，認證方式為Basic Authentication，在請求過程中出現了 

PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target的錯誤，於是開始搜索並得到解決，

下面總結一下解決過程：

我們要做的就是將所要訪問的URL的安全認證證書導入到客戶端中，以下就是獲取安全證書的一種方法：

1.首先新建一個java類，命名為 InstallCert.java,將下面內容保存到文件中

/*
 * Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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");
	    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);
	}
    }

}

2.我是將文件放到D盤根目錄，打開cmd命令開始編譯此java文件

   首先在cmd中進入到java的安裝目錄，然後用 javac 來編譯文件

文件編譯完成後會在 同一個目錄下成兩個類（InstallCert.class，InstallCert$SavingTrustManager.class）

3. 用命令執行 InstallCert.class ，命令方式為：java InstallCert hostname  (hostname為請求服務器的地址)  比如：java InstallCert www.cebbank.com

接下來會看到如下的打印信息

java InstallCert www.cebbank.com
Loading KeyStore /usr/java/jdk1.6.0_31/jre/lib/security/cacerts...
Opening connection to www.cebbank.com:443...
Starting SSL handshake...

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: 
sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:174)
  at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1731)
  at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:241)
  at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:235)
  at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1206)
  at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:136)
  at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:593)
  at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:529)
  at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:925)
  at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1170)
  at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1197)
  at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1181)
  at InstallCert.main(InstallCert.java:102)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: 
sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:323)
  at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:217)
  at sun.security.validator.Validator.validate(Validator.java:218)
  at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:126)
  at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:209)
  at InstallCert$SavingTrustManager.checkServerTrusted(InstallCert.java:198)
  at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1198)
  ... 8 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:174)
  at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:238)
  at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:318)
  ... 14 more

Server sent 1 certificate(s):

 1 Subject CN=www.cebbank.com, OU=Terms of use at www.verisign.com/rpa (c)05, OU=CEB, O="China Everbright Bank Co., Ltd", L=Beijing
   Issuer  CN=VeriSign Class 3 Extended Validation SSL CA, OU=Terms of use at https://www.verisign.com/rpa (c)06, OU=VeriSign Trust Network
   sha1    5b d2 85 6e b3 a4 2b 07 a2 13 47 b3 be 3e 1f c9 d3 ce 46 57 
   md5     05 d8 ae ee f1 d9 51 63 6d 2f 11 e0 ac d0 e7 d7 

Enter certificate to add to trusted keystore or 'q' to quit: [1]

　　然後輸入 1 並回車，會看到類似下面的打印信息

[
[
  Version: V3
  Subject: CN=service.uvpan.com
  Signature Algorithm: SHA256withRSA, OID = 1.2.840.113549.1.1.11

  Key:  Sun RSA public key, 2048 bits
  modulus: 231788198608876119472114482789500949944227474346827557770462853229741747853549763950620726235232342519069911673680471226497
634308961543332172169137368578604955021528942246111911815409088185549136660837904968530263770617490825071029281708805581287573146382156
988547125413531430759608525852511318423406844445234168173367907113071152809771040697029566469752955209390398103399068938288619962718137
3674868501753185286836657606758066747142393165835640040523017880256030555956691753813436498142943955042622976588004799964700139167420116
5072543279163545224784152093458502039083825500983120089499582892294317486244911305201899
  public exponent: 65537
  Validity: [From: Wed Jun 22 15:36:32 CST 2016,
               To: Fri Jun 22 15:36:32 CST 2018]
  Issuer: CN=WoSign CA Free SSL Certificate G2, O=WoSign CA Limited, C=CN
  SerialNumber: [    4c4a82ba 115c1eed fd6861f6 e8e6c15d]

Certificate Extensions: 9
[1]: ObjectId: 1.3.6.1.5.5.7.1.1 Criticality=false
AuthorityInfoAccess [
  [
   accessMethod: ocsp
   accessLocation: URIName: http://ocsp1.wosign.com/ca6/server1/free
,
   accessMethod: caIssuers
   accessLocation: URIName: http://aia1.wosign.com/ca6.server1.free.cer
]
]

[2]: ObjectId: 2.5.29.35 Criticality=false
AuthorityKeyIdentifier [
KeyIdentifier [
0000: D2 A7 16 20 7C AF D9 95   9E EB 43 0A 19 F2 E0 B9  ... ......C.....
0010: 74 0E A8 C7                                        t...
]
]

[3]: ObjectId: 2.5.29.19 Criticality=false
BasicConstraints:[
  CA:false
  PathLen: undefined
]

[4]: ObjectId: 2.5.29.31 Criticality=false
CRLDistributionPoints [
  [DistributionPoint:
     [URIName: http://crls1.wosign.com/ca6-server1-free.crl]
]]

[5]: ObjectId: 2.5.29.32 Criticality=false
CertificatePolicies [
  [CertificatePolicyId: [2.23.140.1.2.1]
[]  ]
  [CertificatePolicyId: [1.3.6.1.4.1.36305.1.1.2]
[PolicyQualifierInfo: [
  qualifierID: 1.3.6.1.5.5.7.2.1
  qualifier: 0000: 16 1D 68 74 74 70 3A 2F   2F 77 77 77 2E 77 6F 73  ..http://www.wos
0010: 69 67 6E 2E 63 6F 6D 2F   70 6F 6C 69 63 79 2F     ign.com/policy/

]]  ]
]

[6]: ObjectId: 2.5.29.37 Criticality=false
ExtendedKeyUsages [
  clientAuth
  serverAuth
]

[7]: ObjectId: 2.5.29.15 Criticality=true
KeyUsage [
  DigitalSignature
  Key_Encipherment
]

[8]: ObjectId: 2.5.29.17 Criticality=false
SubjectAlternativeName [
  DNSName: service.uvpan.com
]

[9]: ObjectId: 2.5.29.14 Criticality=false
SubjectKeyIdentifier [
KeyIdentifier [
0000: 41 1E C2 CA C5 C6 DE 3A   19 02 3B 0B EE 3B 22 09  A......:..;..;".
0010: 76 43 C3 56                                        vC.V
]
]

]
  Algorithm: [SHA256withRSA]
  Signature:
0000: 2C AC BE 2D 4A 38 2F 1F   AE 80 38 F3 64 7B 58 BF  ,..-J8/...8.d.X.
0010: B9 91 8C B6 59 09 42 95   9A BE 50 FD 22 A9 13 DA  ....Y.B...P."...
0020: C2 ED 6B 32 88 DB E2 A6   A1 1C 96 A0 02 B7 1D 2E  ..k2............
0030: 93 9C B7 6C BB F3 FB 92   AF F6 3E 71 5A 0B A5 89  ...l......>qZ...
0040: 46 1F 4F 5F 06 6B 0B FF   77 B2 B2 E2 31 CA 09 86  F.O_.k..w...1...
0050: 78 64 A6 2B DA A1 8D EA   93 DF E8 BB CF F3 55 F9  xd.+..........U.
0060: 10 B0 BA 8D D2 04 7A EB   D4 66 12 D6 03 86 65 D8  ......z..f....e.
0070: 2A 55 EB 6A 92 28 98 52   B8 BC A0 8A 66 EF FE E5  *U.j.(.R....f...
0080: 48 1A 01 9B 14 CB D9 66   62 1C 22 D5 5A C1 00 05  H......fb.".Z...
0090: 00 8C 48 63 F2 E8 42 A8   3D 66 38 FC F0 5A B3 36  ..Hc..B.=f8..Z.6
00A0: C9 47 C1 13 2A CC 06 71   AB 28 28 04 66 80 11 FE  .G..*..q.((.f...
00B0: F6 C0 97 45 85 6B B9 EC   6A 7C E8 EF AD 95 F4 EC  ...E.k..j.......
00C0: BF FF 95 39 D0 45 EB CD   29 E0 84 45 7A 29 F0 B0  ...9.E..)..Ez)..
00D0: 9C F8 E2 72 F7 50 8C AF   FE 9D F5 1E 78 A9 06 A9  ...r.P......x...
00E0: F5 7E 6D B7 AF B2 72 D7   C9 5C FD FC 41 95 FA 1D  ..m...r..\..A...
00F0: E8 AC D5 1C 52 86 67 3D   56 56 A5 B9 87 38 86 20  ....R.g=VV...8.

]

Added certificate to keystore 'jssecacerts' using alias 'service.uvpan.com-1'

同時我們會在當前目錄下發現已經生成了一個名為jssecacerts的證書

再將名為jssecacerts的證書拷貝\\%JAVA_HONME%\\jre\\lib\\security\\目錄中

最後重啟下應用的服務，證書就會生效了，就可以正常發送請求了（重啟tomcat就可以了）。。