使用nginx进行双向认证，可以实现吊销客户端证书。
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在k8s中用ingress配置tls可以实现客户端认证，但吊销功能是不正常的，反复测试未能实现（k8s1.14.8版本）
1 nginx实现Https双向认证
双向认证可自主实现，与机构签发的服务器server证书无关，即只需要自己创建ca和client证书即可。
如果没有机构签发的证书，也可以用自建的ca签发自己本地的server证书，然后再签发client，实现本地环境的双向认证，常用于测试中。
1.1 准备nginx环境
安装nginx
yum -y install gcc gcc-c++ make libtool zlib zlib-devel openssl openssl-devel pcre pcre-devel
rpm -ivh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm
yum install nginx -y
nginx -v
systemctl start nginx
1.2 配置nginx
修改nginx配置文件，已规划好证书路径名称等
vi /etc/nginx/conf.d/443.conf
其中ca.crl是吊销文件，在执行吊销后再启用该配置
server {
listen 443 ssl;
server_name www.younihao.com;
ssl_certificate /etc/nginx/ca/server/server.crt;
ssl_certificate_key /etc/nginx/ca/server/server.key;
ssl_client_certificate /etc/nginx/ca/private/ca.crt;
ssl_session_timeout 5m;
ssl_verify_client on;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
ssl_prefer_server_ciphers on;
# ssl_crl /etc/nginx/ca/private/ca.crl;
charset utf-8;
access_log logs/host.access.log main;
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
location = /favicon.ico {
log_not_found off;
access_log off;
expires 90d;
}
location / {
root /usr/share/nginx/html;
index index.html index.htm;
}
}
1.3 创建自签CA，server，client证书
1.3.1 创建证书目录
cd /etc/nginx/
mkdir ca
cd ca/
mkdir newcerts private conf server users
1.3.2 创建openssl配置文件
vi /etc/nginx/ca/conf/openssl.conf
[ ca ]
default_ca = myserver
[ myserver ]
dir = /etc/nginx/ca
database = /etc/nginx/ca/index.txt
new_certs_dir = /etc/nginx/ca/newcerts
certificate = /etc/nginx/ca/private/ca.crt
serial = /etc/nginx/ca/serial
private_key = /etc/nginx/ca/private/ca.key
RANDFILE = /etc/nginx/ca/private/.rand
default_days = 3650
default_crl_days = 3650
default_md = sha256
unique_subject = no
policy = policy_any
[ policy_any ]
countryName = match
stateOrProvinceName = match
organizationName = match
localityName = optional
commonName = supplied
emailAddress = optional
1.3.3 生成ca，server，client证书
生成ca
openssl genrsa -out /etc/nginx/ca/private/ca.key
openssl req -new -key /etc/nginx/ca/private/ca.key -out private/ca.csr
openssl x509 -req -days 3650 -in /etc/nginx/ca/private/ca.csr -signkey /etc/nginx/ca/private/ca.key -out /etc/nginx/ca/private/ca.crt
设置起始序列号
echo FACE > /etc/nginx/ca/serial
创建CA键库
touch /etc/nginx/ca/index.txt
创建一个证书撤销列表
openssl ca -gencrl -out /etc/nginx/ca/private/ca.crl -crldays 3670 -config "/etc/nginx/ca/conf/openssl.conf"
生成自签server证书
openssl genrsa -out /etc/nginx/ca/server/server.key 2048
openssl req -new -key /etc/nginx/ca/server/server.key -out /etc/nginx/ca/server/server.csr
openssl ca -in /etc/nginx/ca/server/server.csr -cert /etc/nginx/ca/private/ca.crt -keyfile /etc/nginx/ca/private/ca.key -out /etc/nginx/ca/server/server.crt -config "/etc/nginx/ca/conf/openssl.conf"
生成client证书
openssl genrsa -out /etc/nginx/ca/users/client.key 2048
openssl req -new -key /etc/nginx/ca/users/client.key -out /etc/nginx/ca/users/client.csr
openssl ca -in /etc/nginx/ca/users/client.csr -cert /etc/nginx/ca/private/ca.crt -keyfile /etc/nginx/ca/private/ca.key -out /etc/nginx/ca/users/client.crt -config "/etc/nginx/ca/conf/openssl.conf"上面req在创建证书请求文件的时候，需要输入一系列的参数可参看下图
其中Common Name项，server证书请求时需要填域名，ca与client不做要求；其他项保持一致。
1.3.4 将客户端证书转换成PKCS12文件
生成该文件时候需要设置一个密码，浏览器添加该证书时候会用到。
openssl pkcs12 -export -clcerts -in /etc/nginx/ca/users/client.crt -inkey /etc/nginx/ca/users/client.key -out /etc/nginx/ca/users/client.p12
1.4 验证测试双向认证
1.4.1 修改好了nginx配置，证书路径名称都准确无误
nginx -t #检查配置语法格式
nginx -s reload ##加载新配置
1.4.2 下载client.p12文件
sz /etc/nginx/ca/users/client.p12
1.4.3 浏览器添加客户端证书
每个浏览器方法不一样，自行百度p12证书文件导入，导入证书后重启浏览器。
浏览器访问https://www.younihao.com 会跳出证书选择页面，选定myclient证书，就可以正常访问啦
没有证书访问会得到400 Bad Request(No required SSL certificate was sent）错误
1.5 吊销客户端证书
1.5.1 查看serial号
openssl x509 -in /etc/nginx/ca/users/client.crt -noout -serial -subject
[root@loaclhost ]# openssl x509 -in /etc/nginx/ca/users/client.crt -noout -serial -subject
serial=FACF ##查到serial号是FACF
subject= /C=cn/ST=henan/O=supercom/L=zhengzhou/CN=myclient
1.5.2 创建crlnumber
echo 01 > crlnumber ##第一次增加这个
1.5.3 ssl增加吊销配置
vi /etc/nginx/ca/conf/openssl.conf ##增加下面配置
crlnumber= /etc/nginx/ca/crlnumber
1.5.4 执行吊销client证书
openssl ca -revoke /etc/nginx/ca/newcerts/FACF.pem -config "/etc/nginx/ca/conf/openssl.conf"
1.5.5 重新乘车crl吊销列表
openssl ca -gencrl -out /etc/nginx/ca/private/ca.crl -config "/etc/nginx/ca/conf/openssl.conf"
查看吊销是否成功
openssl crl -in /etc/nginx/ca/private/ca.crl -noout -text
1.5.6 调整nginx参数
vi /etc/nginx/conf.d/443.conf ##增加启用crl配置
ssl_crl /etc/nginx/ca/private/ca.crl;
nginx -t #验证重启
nginx -s reload
1.5.7 验证吊销结果
登录浏览器再次访问，选择对应证书，依旧被拒绝访问即为成功。
1.6 nginx认证参考
https://blog.csdn.net/rexueqingchun/article/details/82251563
https://help.aliyun.com/document_detail/54508.html?spm=5176.2020520152.0.0.61bb16ddEk6YWC
2 ingress实现Https双向认证（无吊销功能）
2.1这里是ingress示例
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/auth-tls-verify-client: "on"
nginx.ingress.kubernetes.io/auth-tls-secret: "default/ca-secret"
nginx.ingress.kubernetes.io/auth-tls-verify-depth: "1"
nginx.ingress.kubernetes.io/auth-tls-error-page: "http://www.mysite.com/error-cert.html"
nginx.ingress.kubernetes.io/auth-tls-pass-certificate-to-upstream: "true"
name: nginx-test
namespace: default
spec:
rules:
- host: mydomain.com
http:
paths:
- backend:
serviceName: http-svc
servicePort: 80
path: /
tls:
- hosts:
- mydomain.com
secretName: tls-secret
2.2 创建tls-secret和ca-secret
tls-secret可以使用自建的，也可以使用机构签发的服务器证书
kubectl create secret generic tls-secret --from-file=tls.crt=server.crt --from-file=tls.key=server.key
ca-secret到自己的ca目录创建
cd /etc/nginx/ca/private
kubectl create secret generic ca-secret --from-file=ca.crt=ca.crt
然后创建ingress
kubectl create -f ingress.yaml
2.3 添加其他annotations
ingress 跨域问题 需要在ingress中添加配置下面annotations
nginx.ingress.kubernetes.io/cors-allow-headers: >-
DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization
nginx.ingress.kubernetes.io/cors-allow-methods: 'PUT, GET, POST, OPTIONS'
nginx.ingress.kubernetes.io/cors-allow-origin: '*'
nginx.ingress.kubernetes.io/enable-cors: 'true'
ingress 强制443
nginx.ingress.kubernetes.io/ssl-redirect: 'true'
ingress 白名单访问
nginx.ingress.kubernetes.io/whitelist-source-range: '192.168.5.3'
2.4 ingress 可参考
https://kubernetes.github.io/ingress-nginx/examples/auth/client-certs/
https://kubernetes.github.io/ingress-nginx/examples/PREREQUISITES/#client-certificate-authentication
https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/
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文章标题：nginx与ingress配置HTTPS双向认证-创新互联
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