使用openssl 工具进行双向认证测试

1，双向认证测试（需要根证书，客户证书，服务器证书以及各自的私钥）（验证通信双方的身份）

openssl s_server -accept 8090 -key certs/server.key -cert certs/server-cert.pem -CAfile certs/root-cacert.pem -Verify 1

openssl s_client -connect localhost:8090 -key certs/client.key -cert certs/client-cert.pem -CAfile certs/root-cacert.pem -showcerts
Verify return code: 0 (ok)

2，单项认证测试（验证客户身份）

openssl s_server -accept 8090 -key certs/server.key -cert certs/server-cert.pem
openssl s_client -connect localhost:8090 -CAfile certs/root-cacert.pem -showcerts
Verify return code: 0 (ok)

3，如何生成上面的证书呢（自签名证书为例）

CA证书

openssl genrsa -out certs/root-ca.key 2048
openssl req -new -x509 -days 365 -config ./openssl.cnf -key certs/root-ca.key -out certs/root-cacert.pem -subj "/C=CN/ST=shenzhen/O=EMQ/CN=RootCA"

服务器证书

openssl genrsa -out certs/server.key 2048
openssl req -new -days 365 -key certs/server.key -out certs/server-cert.csr -subj "/C=CN/ST=shenzhen/O=EMQ/CN=Server"
openssl ca -extensions v3_req -days 365 -in certs/server-cert.csr -out certs/server-cert.pem -cert certs/root-cacert.pem -keyfile certs/root-ca.key

客户端证书

openssl genrsa -out certs/client.key 2048
openssl req -new -days 365 -key certs/client.key -out certs/client-cert.csr -subj "/C=CN/ST=shenzhen/O=EMQ/CN=Client"
openssl ca -extensions v3_req -days 365 -in certs/client-cert.csr -out certs/client-cert.pem -cert certs/root-cacert.pem -keyfile certs/root-ca.key

使用根证书验证下服务器证书是否可信的

openssl verify -CAfile certs/root-cacert.pem certs/server-cert.pem

注意证书里CN=Server，身份认证过程中应用程序可能会校验这个字段的，一般这个字段为网站的域名。