实验：CentOS下构建私有CA

一、建立一CA颁发主机（机构）
1、生成私钥；2、自签证书

[root@www1 ~]# (umask 077;openssl genrsa -out /etc/pki/CA/private/cakey.pem 4096)
Generating RSA private key, 4096 bit long modulus
..............................++
....++
e is 65537 (0x10001)

[root@www1 ~]# openssl req -new -x509 -key /etc/pki/CA/private/cakey.pem -out
/etc/pki/CA/cacert.pem -days 360

Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:~~GuangXi~~
Locality Name (eg, city) [Default City]:GuiLin
Organization Name (eg, company) [Default Company Ltd]:~~jinglin~~
Organizational Unit Name (eg, section) []:IT
Common Name (eg, your name or your server's hostname) []:~~ca.jinglin.com~~
Email Address []:~~[email protected]~~ #可留空
[root@www1 ~]# ls /etc/pki/CA/
cacert.pem certs crl newcerts private
[root@www1 ~]# touch /etc/pki/CA/{serial,index.txt} #为CA提供所需的目录及文件
[root@www1 ~]# echo 01 > /etc/pki/CA/serial

二、向CA主机请求签署证书
1、生成私钥；2、生成证书签署请求，3、将请求（通过可靠方式）发送给CA主机；4、CA主机签署证书

[root@localhost httpd]# mkdir ssl #以httpd为例，创建一目录，
[root@localhost httpd]# cd ssl/
[root@localhost ssl]# (umask 077; openssl genrsa -out httpd.key 2048)
Generating RSA private key, 2048 bit long modulus
.+++
...............+++
e is 65537 (0x10001)

[root@localhost ssl]# openssl req -new -key httpd.key -out httpd.csr -days 365

Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:~~GuangXi~~
Locality Name (eg, city) [Default City]:~~GuiLin~~
Organization Name (eg, company) [Default Company Ltd]~~:jinglin~~
Organizational Unit Name (eg, section) []:IT
Common Name (eg, your name or your server's hostname) []:~~www.jinglin.com~~
Email Address []:~~[email protected]~~

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:~~123456~~
An optional company name []:~~123456~~
[root@localhost ssl]# scp httpd.csr [email protected]:/tmp/

[root@www1 ~]# openssl ca -in /tmp/httpd.csr -out /etc/pki/CA/certs/httpd.crt -days 365
[root@www1 ~]# cd /etc/pki/CA/
[root@www1 CA]# cat index.txt
V 190802095707Z 01 unknown /C=CN/ST=GuangXi/O=jinglin/OU=ca.jinglin.com/CN=www.jinglin.org/[email protected]
[root@www1 CA]# scp certs/httpd.crt [email protected]:/etc/httpd/ssl/ #签完后发回，然后删除两台主机上的httpd.csr

[root@localhost ssl]# openssl x509 -in httpd.crt -noout -serial -subject #查看证书信息
serial=01
subject= /C=CN/ST=GuangXi/O=jinglin/OU=ca.jinglin.com/CN=www.jinglin.org/[email protected]

私有CA构建完成