有时候你可能发现 SunCertPathBuilderException: unable to find valid certification path to requested target
的错误。
如果这个错误的原因是 JDK 不信任签发该证书的 CA,则可以通过以下方法来解决(此方法同样适用于对自签发证书的信任)。
首先得搞到这个 CA 的证书,下面以 CFCA 中国金融认证中心 为例:
先创建证书的 PEM 文件(不要问文件从哪里获取):
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cat << EOF > cfcaevroot-ca.pem
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
EOF
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如果你安装的是 JDK
执行下列命令把 CA 证书导入进 JDK 的 cacerts:
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keytool -import \
-alias cfcaevroot \
-keystore $JAVA_HOME/jre/lib/security/cacerts \
-storepass changeit \
-noprompt \
-file cfcaevroot-ca.pem
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注意上面 -alias
参数,这个是给证书取个别名;-file
参数,指定的是 CA 证书的路径。
执行下列命令确认证书已经导入(如果没有结果则说明没有导入):
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keytool -list \
-keystore $JAVA_HOME/jre/lib/security/cacerts \
-storepass changeit \
| grep -C1 -i cfcaevroot
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如果你安装的是 JRE
注意 -keystore
参数的区别:
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keytool -import \
-alias cfcaevroot \
-keystore $JAVA_HOME/lib/security/cacerts \
-storepass changeit \
-noprompt \
-file cfcaevroot-ca.pem
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执行下列命令确认证书已经导入(如果没有结果则说明没有导入):
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keytool -list \
-keystore $JAVA_HOME/lib/security/cacerts \
-storepass changeit \
| grep -C1 -i cfcaevroot
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最后重启 Java 程序
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