04f5怎么样2017？我来告诉你答案JDK版本低导致对Let’s Encrypt证书不信任的问题

例外信息：

javax . net . pkix path building failed : unable to find valid certification path to requested target原因：

此问题通常发生在以下情况下：

Java调用的第三方服务使用Let's Encrypt颁发的证书，JVM不信任Let's Encrypt证书。这是因为本地JDK版本太低，Let's Encrypt证书不在JVM的信任列表中。

解决方法：

方法1(推荐):

本地JDK升级(Java 7=7 u111 and Java 8=8u 101)

方法2:

在代码级别忽略证书(不建议使用，可临时使用以防止安全风险)

方法3:

使用工具类在本地JVM上安装证书，如下所示：

创建In文件，如下所示：

import Java . io . buffered reader；

import Java . io . file；

import Java . io . fileinputstream；

import Java . io . fileoutputstream；

import Java . io . input stream；

import Java . io . inputstreamreader；

import Java . io . output stream；

Import Java。

Import Java。

Import Java。

Import Java。

Import javax.net

Import javax.net

Import javax.net

Import javax.net

Import javax.net

import javax . net . factory；

Import javax.net

Public class InstallCert {

public static void main(string[]args)throws exception {

字串主机；

Int port

char[]pass phrase；

if==1)| | |==2){

String[] c=args[0]。split(' : ')；

主机=c[0]；

Port====1)？443 3360 in(c[1])；

字串p====1)？变更it ' : args[1]；

pass phrase=p . to chararray()；

} else {

sy(' usage : Java install cert host[: port][pass phrase]')；

Return

}

File File=new File(' jss ecacerts ')；

If ()==false) {

Char SEP=File.separatorChar

filedir=new file(' Java . home ')sep ' lib ' sep ' security ')；

File=new File(dir，' js secacerts ')；

If ()==false) {

File=new File(dir，' cacerts ')；

}

}

Sy('Loading KeyStore' file ' . '))；

inputstream in=new file inputstream(文件)；

KeyStore ks=KeyS()；

Ks.load(in，pass phrase)；

in . close()；

SSLCont

ext context = SSLCon("TLS"); TrustManagerFactory tmf = Tru()); (ks); X509TrustManager defaultTrustManager = (X509TrustManager) ()[0]; SavingTrustManager tm = new SavingTrustManager(defaultTrustManager); con(null, new TrustManager[] { tm }, null); SSLSocketFactory factory = con(); Sy("Opening connection to " + host + ":" + port + "..."); SSLSocket socket = (SSLSocket) (host, port); (10000); try { Sy("Starting SSL handshake..."); (); (); Sy(); Sy("No errors, certificate is already trusted"); } catch (SSLException e) { Sy(); e.printStackTrace); } X509Certificate[] chain = ; if (chain == null) { Sy("Could not obtain server certificate chain"); return; } BufferedReader reader = new BufferedReader(new InputStreamReader)); Sy(); Sy("Server sent " + c + " certificate(s):"); Sy(); MessageDigest sha1 = Me("SHA1"); MessageDigest md5 = Me("MD5"); for (int i = 0; i < c; i++) { X509Certificate cert = chain[i]; Sy(" " + (i + 1) + " Subject " + cert.getSubjectDN()); Sy(" Issuer " + cert.getIssuerDN()); ()); Sy(" sha1 " + toHexString())); md5.update()); Sy(" md5 " + toHexString())); Sy(); } Sy("Enter certificate to add to trusted keystore or 'q' to quit: [1]"); String line = reader.readLine().trim(); int k; try { k = () == 0) ? 0 : In(line) - 1; } catch (NumberFormatException e) { Sy("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(); Sy(); Sy(cert); Sy(); Sy("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 * 3); for (int b : bytes) { b &= 0xff; (HEXDIGITS[b >> 4]); (HEXDIGITS[b & 15]); (' '); } return (); } private static class SavingTrustManager implements X509TrustManager { private final X509TrustManager tm; private X509Certificate[] chain; SavingTrustManager(X509TrustManager tm) { = tm; } @Override public X509Certificate[] getAcceptedIssuers() { return new X509Certificate[0]; //throw new UnsupportedOperationException(); } public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException { throw new UnsupportedOperationException(); } public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException { = chain; (chain, authType); } } }

编译此文件：

javac In

执行安装证书：

java InstallCert www.domain.com

记录如下：

# java InstallCert www.domain.com Loading KeyStore /data/a... Opening connection to www.domain.com:443... Starting SSL handshake... javax.net.: : PKIX path building failed: : unable to find valid certification path to requested target at (Alerts.java:192) at (SSLSocketImpl.java:1949) at (Handshaker.java:302) at (Handshaker.java:296) at (ClientHandshaker.java:1509) at (ClientHandshaker.java:216) at (Handshaker.java:979) at (Handshaker.java:914) at (SSLSocketImpl.java:1062) at (SSLSocketImpl.java:1375) at (SSLSocketImpl.java:1403) at (SSLSocketImpl.java:1387) at In(In:71) Caused by: : PKIX path building failed: : unable to find valid certification path to requested target at (PKIXValidator.java:387) at (PKIXValidator.java:292) at (Validator.java:260) at sun.security.Impl.validate(X509TrustManagerImpl.java:324) at sun.security.Impl.checkTrusted(X509TrustManagerImpl.java:229) at sun.security.Impl.checkServerTrusted(X509TrustManagerImpl.java:105) at InstallCert$SavingTru(In:169) at (SSLContextImpl.java:922) at (ClientHandshaker.java:1491) ... 8 more Caused by: : unable to find valid certification path to requested target at (SunCertPathBuilder.java:141) at (SunCertPathBuilder.java:126) at java.(CertPathBuilder.java:280) at (PKIXValidator.java:382) ... 16 more Server sent 2 certificate(s): 1 Subject CN=www.domain.com Issuer CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US sha1 0a be b4 66 34 61 0c 12 a6 ce 41 23 fa a6 ac 07 4e 0d 01 c5 md5 03 62 53 b6 64 eb e2 c1 94 b1 78 ca 7f ca ba 09 2 Subject CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US Issuer CN=DST Root CA X3, O=Digital Signature Trust Co. sha1 e6 a3 b4 5b 06 2d 50 9b 33 82 28 2d 19 6e fe 97 d5 95 6c cb md5 b1 54 09 27 4f 54 ad 8f 02 3d 3b 85 a5 ec ec 5d Enter certificate to add to trusted keystore or 'q' to quit: [1] [ [ Version: V3 Subject: CN=www.domain.com Signature Algorithm: SHA256withRSA, OID = 1.2.840.113549.1.1.11 Key: Sun RSA public key, 2048 bits modulus: 200730052437287038905886259434398485612135504230346105985393693968678697470073533497726894253716749732354669284352356364482324659070272475265105200516344733385807184770917288823070595268127830274256454298387634509973843867204687586347008482089644786706086466198569419055785142073582810635466008668388439780072550163434088278103668404935770378699165880663307524095122347914948370933864789699327953377063904205745312095190881629648838587040233849837899247906940630765663557239 public exponent: 65537 Validity: [From: Thu May 03 09:57:46 CST 2018, To: Wed Aug 01 09:57:46 CST 2018] Issuer: CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US SerialNumber: [ 0490ded4 91a4b26f d82aaa5a bd06ffa4 4804] Certificate Extensions: 9 [1]: ObjectId: 1.3.6.1.4.1.11129.2.4.2 Criticality=false Extension unknown: DER encoded OCTET string = 0000: 04 81 F5 04 81 F2 00 F0 00 76 00 55 81 D4 C2 16 .........v.U.... 0010: 90 36 01 4A EA 0B 9B 57 3C 53 F0 C0 E4 38 78 70 .6.J...W<S...8xp 0020: 25 08 17 2F A3 AA 1D 07 13 D3 0C 00 00 01 63 23 %../..........c# 0030: EF 2B C9 00 00 04 03 00 47 30 45 02 21 00 E3 52 .+......G0E.!..R 0040: 37 05 FF 9F F1 16 CE 6F A4 86 77 DF 3D 4D 82 CF 7......o..w.=M.. 0050: 92 2D BC 04 2F 1C B0 DC 4E FF 90 C1 D1 7E 02 20 .-../...N...... 0060: 27 E7 AF 9E 09 14 32 D0 52 BD B9 1F FD B4 8B 1C '.....2.R....... 0070: DF A2 FD 6C FE B2 E6 9B 3A 45 47 78 6B 37 AE A3 ...l....:EGxk7.. 0080: 00 76 00 29 3C 51 96 54 C8 39 65 BA AA 50 FC 58 .v.)<Q.T.9e..P.X 0090: 07 D4 B7 6F BF 58 7A 29 72 DC A4 C3 0C F4 E5 45 ...o.Xz)r......E 00A0: 47 F4 78 00 00 01 63 23 EF 2B A4 00 00 04 03 00 G.x...c#.+...... 00B0: 47 30 45 02 20 0A 09 D1 3F 17 B2 D5 21 F9 D8 9D G0E. ...?...!... 00C0: D1 15 73 4F 81 DC 4C 0A CB 1F F6 34 47 B8 F3 8F ..sO..L....4G... 00D0: 21 2D 8B 25 01 02 21 00 FD 99 44 63 9C 65 54 A4 !-.%..!...Dc.eT. 00E0: 74 FC FB F6 D1 60 66 25 60 DF C0 97 59 9B 08 6C t....`f%`...Y..l 00F0: DE 13 58 7F 6B 5A 23 E8 ..X.kZ#. [2]: ObjectId: 1.3.6.1.5.5.7.1.1 Criticality=false AuthorityInfoAccess [ [ accessMethod: ocsp accessLocation: URIName: , accessMethod: caIssuers accessLocation: URIName: ] ] [3]: ObjectId: 2.5.29.35 Criticality=false AuthorityKeyIdentifier [ KeyIdentifier [ 0000: A8 4A 6A 63 04 7D DD BA E6 D1 39 B7 A6 45 65 EF .Jjc......9..Ee. 0010: F3 A8 EC A1 .... ] ] [4]: ObjectId: 2.5.29.19 Criticality=true BasicConstraints:[ CA:false PathLen: undefined ] [5]: ObjectId: 2.5.29.32 Criticality=false CertificatePolicies [ [CertificatePolicyId: [2.23.140.1.2.1] [] ] [CertificatePolicyId: [1.3.6.1.4.1.44947.1.1.1] [PolicyQualifierInfo: [ qualifierID: 1.3.6.1.5.5.7.2.1 qualifier: 0000: 16 1A 68 74 74 70 3A 2F 2F 63 70 73 2E 6C 65 74 .. 0010: 73 65 6E 63 72 79 70 74 2E 6F 72 67 ], PolicyQualifierInfo: [ qualifierID: 1.3.6.1.5.5.7.2.2 qualifier: 0000: 30 81 9E 0C 81 9B 54 68 69 73 20 43 65 72 74 69 0.....This Certi 0010: 66 69 63 61 74 65 20 6D 61 79 20 6F 6E 6C 79 20 ficate may only 0020: 62 65 20 72 65 6C 69 65 64 20 75 70 6F 6E 20 62 be relied upon b 0030: 79 20 52 65 6C 79 69 6E 67 20 50 61 72 74 69 65 y Relying Partie 0040: 73 20 61 6E 64 20 6F 6E 6C 79 20 69 6E 20 61 63 s and only in ac 0050: 63 6F 72 64 61 6E 63 65 20 77 69 74 68 20 74 68 cordance with th 0060: 65 20 43 65 72 74 69 66 69 63 61 74 65 20 50 6F e Certificate Po 0070: 6C 69 63 79 20 66 6F 75 6E 64 20 61 74 20 68 74 licy found at ht 0080: 74 70 73 3A 2F 2F 6C 65 74 73 65 6E 63 72 79 70 tps://letsencryp 0090: 74 2E 6F 72 67 2F 72 65 70 6F 73 69 74 6F 72 79 t.org/repository 00A0: 2F / ]] ] ] [6]: ObjectId: 2.5.29.37 Criticality=false ExtendedKeyUsages [ serverAuth clientAuth ] [7]: ObjectId: 2.5.29.15 Criticality=true KeyUsage [ DigitalSignature Key_Encipherment ] [8]: ObjectId: 2.5.29.17 Criticality=false SubjectAlternativeName [ DNSName: www.domain.com ] [9]: ObjectId: 2.5.29.14 Criticality=false SubjectKeyIdentifier [ KeyIdentifier [ 0000: 4D 27 88 53 F8 2B E5 57 E3 93 A2 39 0C D0 8A D8 M'.S.+.W...9.... 0010: E5 BC 84 A4 .... ] ] ] Algorithm: [SHA256withRSA] Signature: 0000: 5D 16 29 6D C4 E8 76 AC 32 CF 44 AE E4 27 3B 44 ].)m..v.2.D..';D 0010: CC A7 9A DF 95 1A AC 73 AF 2B 89 51 14 32 2C 5D .......s.+.Q.2,] 0020: 7C 04 9E 29 47 AA AD C4 CF 9E EF DB B3 7B A9 09 ...)G........... 0030: 28 8B 85 60 C1 4B 67 31 D5 4C 7A C6 54 64 C9 90 (..`.Kg1.Lz.Td.. 0040: 7C 31 7A A4 CA 59 CD 9B 0B 78 0C C0 00 A4 F6 EF .1z..Y...x...... 0050: 99 AF 60 F7 98 3C DB F0 8E 08 38 7F 8B 7F C0 9A ..`..<....8..... 0060: 18 0B 2C D5 CD 01 08 EB 2C EA AA 69 21 C7 99 6E ..,.....,..i!..n 0070: 24 4E 13 41 94 28 7A C2 D2 43 E9 20 22 C2 35 C9 $N.A.(z..C. ".5. 0080: 9D 05 51 25 DB 4D D5 19 58 3B D7 1D 8E DB F2 2E ..Q%.M..X;...... 0090: 78 73 63 35 9C B2 51 88 00 00 61 1F DB 79 87 EA xsc5..Q...a..y.. 00A0: AF 60 9F F7 03 CA B7 63 F4 95 C2 D1 8F D0 1E 2F .`.....c......./ 00B0: 21 65 D0 CF EF 7A B9 F7 B7 2A BF F2 04 BE 78 F4 !e...z...*....x. 00C0: 6F EA 29 89 00 15 E0 8F 72 77 79 8A 9C 6E 2E 98 o.).....rwy..n.. 00D0: C9 EE BF 71 18 AB 90 7A 65 C8 FD 03 1C 7C 0B 32 ...q...ze......2 00E0: DD 00 06 D4 67 61 AF BF 83 3F F3 D8 9D EE 3B 2E ....ga...?....;. 00F0: E4 94 BB AD 9B 48 47 F3 C2 CE C2 36 8C ED 74 3E .....HG....6..t> ] Added certificate to keystore 'jssecacerts' using alias 'www.domain.com-1'

成功执行后在运行的目录下会生成一个叫 jssecacerts 的文件，将这个文件拷贝到jdk的安装目录：

mv jssecacerts $JAVA_HOME/jre/lib/security/

最后重启tomcat。