2020
07-22

CentOS7使用OpenSSL生成自签名SSL证书

下面介绍如何生成自签名SSL证书。前提是系统已经安装好openssl

由于生成自签证书需要用到OpenSSL,请确认系统已经提前安装成功了OpenSSL。

CentOS7使用OpenSSL生成自签名SSL证书

检查OpenSSL

检查是否已经安装openssl

openssl version

一般在CentOS7上,openssl已经默认安装好了。

生成自签名的SSL证书和私钥

[root@mail ~]# cd /etc/pki/tls/certs

生成私钥

[root@mail certs]# make server.key

umask 77 ; \

/usr/bin/openssl genrsa -aes128 2048 > server.key

Generating RSA private key, 2048 bit long modulus

..............................................................+++

.........+++

e is 65537 (0x010001)

Enter pass phrase:    #输入密码

Verifying - Enter pass phrase:  #重复输入密码

下面这个步骤是删除server.key中的密码

[root@mail certs]# openssl rsa -in server.key -out server.key

Enter pass phrase for server.key:  #输入刚才设置的密码

writing RSA key

生成CSR(证书签名请求)

[root@mail certs]# make server.csr

umask 77 ; \

/usr/bin/openssl req -utf8 -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   #国家简称

State or Province Name (full name) []:Beijing   #省

Locality Name (eg, city) [Default City]:Beijing  #城市

Organization Name (eg, company) [Default Company Ltd]:OPS  #公司名

Organizational Unit Name (eg, section) []:OPS   #部门名

Common Name (eg, your name or your server's hostname) []:mail.sky.win

Email Address []:admin@sky.win

Please enter the following 'extra' attributes

to be sent with your certificate request

A challenge password []:  #直接按Enter

An optional company name []:  #直接按Enter

生成自签名证书

[root@mail certs]# openssl x509 -in server.csr -out server.crt -req -signkey server.key -days 3650

Signature ok

subject=C = CN, ST = Beijing, L = Beijing, O = OPS, OU = OPS, CN = mail.sky.win, emailAddress = admin@sky.win

Getting Private key

设置权限

[root@mail certs]# chmod 400 server.*

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