openssl 签发证书相关命令

原创

mb636d9e4ce84d1 2022-11-11 09:43:07 博主文章分类：安全 ©著作权

文章标签 openssl 格式转换 pem jks 签发证书 文章分类 前端开发

©著作权归作者所有：来自51CTO博客作者mb636d9e4ce84d1的原创作品，请联系作者获取转载授权，否则将追究法律责任

文章目录

生成私钥作为根证书私钥
生成csr文件
生成ca证书
签发服务器/客户端证书
证书格式转换
查看证书内容
jks证书转pem
对加密的私钥进行解密
验证证书和私钥有效性

生成私钥作为根证书私钥

[root@localhost certs]# openssl genrsa -out ca.key 2048
Generating RSA private key, 2048 bit long modulus
...............+++
...................+++
e is 65537 (0x10001)
[root@localhost certs]# ll
total 12
-rw-r--r--. 1 root root 1261 Apr 17 21:03 cert.pem
-rw-r--r--. 1 root root 1704 Apr 17 21:03 key.pem
-rw-r--r--. 1 root root 1675 Apr 17 22:36 ca.key

生成csr文件

[root@localhost certs]# openssl req -new -key ca.key -out ca.csr
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [XX]:cn
State or Province Name (full name) []:bj
Locality Name (eg, city) [Default City]:bj
Organization Name (eg, company) [Default Company Ltd]:pcitc
Organizational Unit Name (eg, section) []:pcitc
Common Name (eg, your name or your server's hostname) []:192.168.195.10
Email Address []:

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:
You have new mail in /var/spool/mail/root
[root@localhost certs]# ll
total 16
-rw-r--r--. 1 root root 1261 Apr 17 21:03 cert.pem
-rw-r--r--. 1 root root 1704 Apr 17 21:03 key.pem
-rw-r--r--. 1 root root  993 Apr 17 22:42 ca.csr
-rw-r--r--. 1 root root 1675 Apr 17 22:36 ca.key

生成ca证书

[root@localhost certs]# openssl x509 -req -in ca.csr -signkey ca.key -days 3650 -out ca.pem
Signature ok
subject=/C=cn/ST=bj/L=bj/O=pcitc/OU=pcitc/CN=192.168.195.10
Getting Private key
[root@localhost certs]# ll
total 20
-rw-r--r--. 1 root root  993 Apr 17 22:42 ca.csr
-rw-r--r--. 1 root root 1675 Apr 17 22:36 ca.key
-rw-r--r--. 1 root root 1184 Apr 17 22:44 ca.pem
-rw-r--r--. 1 root root 1261 Apr 17 21:03 cert.pem
-rw-r--r--. 1 root root 1704 Apr 17 21:03 key.pem

签发服务器/客户端证书

重复上述步骤生成服务器/客户端的key 和 csr文件

[root@localhost certs]# openssl genrsa -out server.key 2048
Generating RSA private key, 2048 bit long modulus
.................................+++
.....................................+++
e is 65537 (0x10001)
[root@localhost certs]# openssl req -new -key server.key -out server.csr
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [XX]:cn
State or Province Name (full name) []:bj
Locality Name (eg, city) [Default City]:bj
Organization Name (eg, company) [Default Company Ltd]:pcitc
Organizational Unit Name (eg, section) []:pictc
Common Name (eg, your name or your server's hostname) []:192.168.195.10
Email Address []:

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:
[root@localhost certs]# ll
total 28
-rw-r--r--. 1 root root  993 Apr 17 22:42 ca.csr
-rw-r--r--. 1 root root 1675 Apr 17 22:36 ca.key
-rw-r--r--. 1 root root 1184 Apr 17 22:44 ca.pem
-rw-r--r--. 1 root root 1261 Apr 17 21:03 cert.pem
-rw-r--r--. 1 root root 1704 Apr 17 21:03 key.pem
-rw-r--r--. 1 root root  993 Apr 17 22:47 server.csr
-rw-r--r--. 1 root root 1675 Apr 17 22:46 server.key

签发服务器/客户端证书

root@localhost certs]# openssl ca -in server.csr -cert ca.pem -keyfile ca.key -out server.pem
......
[root@localhost certs]# ll
total 36
-rw-r--r--. 1 root root  993 Apr 17 22:42 ca.csr
-rw-r--r--. 1 root root 1675 Apr 17 22:36 ca.key
-rw-r--r--. 1 root root 1184 Apr 17 22:44 ca.pem
-rw-r--r--. 1 root root 1261 Apr 17 21:03 cert.pem
-rw-r--r--. 1 root root 1704 Apr 17 21:03 key.pem
-rw-r--r--. 1 root root  993 Apr 17 22:47 server.csr
-rw-r--r--. 1 root root 1675 Apr 17 22:46 server.key
-rw-r--r--. 1 root root 4597 Apr 17 22:59 server.pem
You have new mail in /var/spool/mail/root

如果遇到/etc/pki/CA/index.txt 不存在执行 touch /etc/pki/CA/index.txt
如果遇到 /etc/pki/CA/serial 不存在错误执行：echo 00 > /etc/pki/CA/serial

证书格式转换

openssl x509 -in example_cert.pem -out cert.der -outform DER
openssl x509 -in cert.der -inform DER -out cert.pem -outform PEM
证书转换为pks12格式
openssl pkcs12 -export -clcerts -in /root/ca/users/client.crt -inkey /root/ca/users/client.key -out /root/ca/users/client.p12

openssl pkcs12 -export -clcerts -in client.pem -inkey client.key -out client.p12
Enter Export Password:
Verifying - Enter Export Password:
[root@localhost certs]# ll

查看证书内容

openssl x509 -text -in example_cert.pem -noout
openssl req -inexample_csr.pem noout -text

[root@localhost certs]# openssl  x509 -text -in server.pem -noout
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 0 (0x0)
    Signature Algorithm: sha256WithRSAEncryption
        Issuer: C=cn, ST=bj, L=bj, O=pcitc, OU=pcitc, CN=192.168.195.10
        Validity
            Not Before: Apr 17 14:59:30 2022 GMT
            Not After : Apr 17 14:59:30 2023 GMT
        Subject: C=cn, ST=bj, O=pcitc, OU=pictc, CN=192.168.195.10
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)

jks证书转pem

jks 是java证书转换格式需要借助java的keytool，具体步骤如下

– keytool将jks转化为pkcs12格式，期间需要输入jks密码并设置pkcs12密码

keytool -importkeystore -srckeystore server.keystore.jks -destkeystore server.keystore.p12 -srcstoretype jks -deststoretype pkcs12

–通过openssl将pkcs12转为pem

openssl pkcs12 -nodes -in server.keystore.p12 -out server.keystore.pem

server.keystore.pem 中包含了私钥和证书

对加密的私钥进行解密

采用如下命令会对已加密的key值进行解密，某些应用必须配置解密后的明文私钥。解密过程中需要输入加密用的密钥

openssl rsa -in kfpt.key -out kfpt.key.insec

验证证书和私钥有效性

通过如下命令使用指定的证书和私钥在服务器上启动一个tls服务
再通过openssl s_client 去连接该服务，如果公钥私钥正常那么服务端能够打印出客户端发送的消息

openssl s_server -msg -verify -tls1_2 -state -cert kfpt.crt -key kfpt.key -accept 18444
openssl s_client -msg -verify -tls1_2  -state -showcerts -cert kfpt.crt -key kfpt.key -connect localhost:18444