cfssl是一个开源的证书管理工具,使用json文件生成证书,相比openssl更方便使用。

下载软件包

wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo

获取默认设置

cfssl print-defaults config > ca-config.json
cfssl print-defaults csr > ca-csr.json

创建CA配置文件

cat > ca-config.json << EOF
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"www": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF

创建CA签名请求

cat > ca-csr.json << EOF
{
"CA": {"expiry": "87600h"},
"CN": "etcd CA",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing"
}
]
}
EOF

生成CA和私钥

cfssl gencert -initca ca-csr.json | cfssljson -bare ca

自签证书请求

cat > server-csr.json << EOF
{
"CN": "etcd",
"hosts": [
"192.168.31.61",
"192.168.31.62",
"192.168.31.63"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing"
}
]
}
EOF

生成证书

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server

检查证书文件过期时间

cat server.pem |openssl x509 -noout -enddate