Linux使用CFSSL自签TLS证书

⒈安装CFSSL

wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64

　　①生成证书

　　②利用Json生成证书

　　③查看证书信息的工具

⒉修改权限

chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64

⒊移动文件

mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo

⒋验证指令

cfssl --help

　　①print-defaults　　输出生成证书的模板

*生成一个配置模板

cfssl print-defaults config > config.json

　　默认生成的模板文件如下：

 {
     "signing": {　　//签名
         "default": {
             "expiry": "168h"　　//默认过期时间
         },
         "profiles": {
             "www": {
                 "expiry": "8760h",
                 "usages": [
                     "signing",
                     "key encipherment",
                     "server auth"
                 ]
             },
             "client": {
                 "expiry": "8760h",
                 "usages": [
                     "signing",
                     "key encipherment",
                     "client auth"
                 ]
             }
         }
     }
 }

*生成证书信息文件

cfssl print-defaults csr > csr.json

默认生成的模板文件如下：

 {
     "CN": "example.net",　　//标识具体的域
     "hosts": [　　//使用该证书的域名
         "example.net",
         "www.example.net"
     ],
     "key": {　　//加密方式，一般RSA 2048
         "algo": "ecdsa",
         "size": 256
     },
     "names": [　　//证书包含的信息，例如国家、地区等
         {
             "C": "US",
             "L": "CA",
             "ST": "San Francisco"
         }
     ]
 }

⒌生成配置模板及证书信息

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

 cat > ca-csr.json <<EOF
 {
     "CN":"kubernetes",
     "key":{
         "algo":"rsa",
         "size":
     },
     "names":[
         {
             "C":"CN",
             "L":"Hebei",
             "ST":"Zhangjiakou",
             "O":"k8s",
             "OU":"System"
         }
     ]
 }
 EOF

⒍使用证书信息文件生成证书

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

⒎生成服务端的配置模板及证书信息

 cat > server-csr.json << EOF
 {
     "CN":"kubernetes",
     "hosts":[
         "127.0.0.1",
         "192.168.0.211",
         "192.168.0.212",
         "192.168.0.213",
         "10.10.10.1",
         "kubernetes",
         "kubernetes.default",
         "kubernetes.default.svc",
         "kubernetes.default.svc.cluster",
         "kubernetes.default.svc.cluste.local"
     ],
     "key":{
         "algo":"rsa",
         "size":
     },
     "names":[
         {
             "C":"CN",
             "L":"Hebei",
             "ST":"Zhangjiakou",
             "O":"k8s",
             "OU":"System"
         }
     ]
 }
 EOF

⒏使用证书信息生成证书

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

⒐集群管理员通过该证书访问集群

 cat > admin-csr.json <<EOF
 {
     "CN":"admin",
     "hosts":[],
     "key":{
         "algo":"rsa",
         "size":
     },
     "names":[
         {
             "C":"CN",
             "L":"Hebei",
             "ST":"Zhangjiakou",
             "O":"system:masters",
             "OU":"System"
         }
     ]
 }
 EOF

⒑生成证书

 cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

⒒

 cat > kube-proxy-csr.json <<EOF
 {
     "CN":"system:kube-proxy",
     "hosts":[],
     "key":{
         "algo":"rsa",
         "size":
     },
     "names":[
         {
             "C":"CN",
             "L":"Hebei",
             "ST":"Zhangjiakou",
             "O":"k8s",
             "OU":"System"
         }
     ]
 }
 EOF

⒓生成证书

 cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

⒔只保留证书文件，删除多余的文件

 ls |grep -v pem |xargs -i rm {}