我正在尝试将 HTTPS 请求从我的 Java EE 程序发送到需要证书身份验证的主机。我有一个正确的密钥库文件,带有导入 CA 的信任库,两者的列表都显示证书在里面。
但我收到以下错误:
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: KeyUsage does not allow digital signatures
at ...
...
Caused by: sun.security.validator.ValidatorException: KeyUsage does not allow digital signatures
at sun.security.validator.EndEntityChecker.checkTLSServer(EndEntityChecker.java:270)
at sun.security.validator.EndEntityChecker.check(EndEntityChecker.java:141)
at sun.security.validator.Validator.validate(Validator.java:264)
at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:326)
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:231)
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:126)
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1319)
... 29 more
查看扩展部分中的证书内容,我看到以下内容:
Extensions:
#1: ObjectId: 2.5.29.14 Criticality=false
SubjectKeyIdentifier [
KeyIdentifier [
0000: 33 87 72 1D 09 2F DF FF 1A A7 D1 C0 E1 CF C5 FA 3.r../..........
0010: A4 19 54 2E ..T.
]
]
#2: ObjectId: 2.16.840.1.113730.1.1 Criticality=false
NetscapeCertType [
SSL client
]
#3: ObjectId: 2.5.29.35 Criticality=false
AuthorityKeyIdentifier [
KeyIdentifier [
0000: 74 9F 43 07 CC 75 FA D3 D0 13 0F 65 36 CC 4A 9A t.C..u.....e6.J.
0010: E0 8E 9C 52 ...R
]
]
#4: ObjectId: 2.5.29.31 Criticality=false
CRLDistributionPoints [
[DistributionPoint:
[URIName: http://test.az:7447/Test%20CA.crl]
]]
#5: ObjectId: 2.5.29.15 Criticality=true
KeyUsage [
DigitalSignature
]
所以我的证书确实包含KeyUsage [ DigitalSignature ]
抛出异常的地方的代码片段如下所示:
private final static int KU_SIGNATURE = 0;
...
private void checkTLSServer(X509Certificate cert, String parameter)
throws CertificateException {
Set<String> exts = getCriticalExtensions(cert);
...
} else if (KU_SERVER_SIGNATURE.contains(parameter)) {
if (checkKeyUsage(cert, KU_SIGNATURE) == false) {
throw new ValidatorException
("KeyUsage does not allow digital signatures",
ValidatorException.T_EE_EXTENSIONS, cert);
}
}
...
}
和checkKeyUsage函数:
private boolean checkKeyUsage(X509Certificate cert, int bit)
throws CertificateException {
boolean[] keyUsage = cert.getKeyUsage();
if (keyUsage == null) {
return true;
}
return (keyUsage.length > bit) && keyUsage[bit];
}
它返回失败(keyUsage.length > bit) && keyUsage[bit];
问题是为什么上面表达式的结果= false?当 bit = 0 并且 cert.getKeyUsage() 必须返回一个布尔数组 [true, false, false, false, false, false, false, false, false]