Update enable-tls-between-clients-and-servers.md

[hecao100]

Modify the method of establishing SSL encrypted communication

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[hecao100]

Modify the method of establishing SSL encrypted communication

[qiancai]

Hi @hecao100, thanks for the contribution. Please click the following link in your PR description to sign the CLA.

[ljun0712]

Suggested change

	TiDB 客户端与服务端间的通信开启 TLS 加密可以分为两种：1、只开启SSL加密通信；2、强制校验客户端证书。
	TiDB 服务端配置开启与客户端之间通信的 TLS 加密传输，可以分为两种类型：1、只开启 TLS 加密传输；2、服务端强制校验客户端证书。
	+ 只开启 TLS 加密传输：可以手动配置参数 `ssl-cert`、`ssl-key`，开启 TLS 加密传输；也可以配置参数 `auto-tls` 自动生成证书以开启 TLS 加密传输。配置参数 `ssl-ca` 可以增加对客户端证书进行校验，但是不是强制的，客户端可以不提供证书，如果提供证书则必须是合法的证书。
	+ 服务端强制校验客户端证书：当服务端配置了参数 `ssl-cert`、`ssl-key` 和 `ssl-ca` 的基础上，打开了系统变量`require_secure_transport` 后，服务端将强制要求客户端提供证书并校验证书合法性。

[ljun0712]

Suggested change

	+ 通过配置系统变量 `require_secure_transport` 要求所有用户必须使用加密连接来连接到 TiDB。开启后会校验客户端证书。此为上文说的强制校验客户端证书。
	+ 通过配置系统变量 [`require_secure_transport`] (/system-variables.md#require_secure_transport-new-in-v610)要求所有用户必须基于某种形式的安全传输机制连接到 TiDB，此时服务端仅允许使用 TLS 的 TCP/IP 连接，或者使用 Unix 套接字的连接。

[ljun0712]

security.require-secure-transport已经失效了，取而代之的是系统变量require_secure_transport，此系统变量的开启需要用户基于安全连接到数据库后，使用SET命令进行开启。
另外：当前章节是概述部分，要补充配置示例，请在 <##配置 TiDB 服务端启用安全连接> 章节进行。

[ljun0712]

Suggested change

	`auto-tls` 支持安全连接，但不提供客户端证书验证。此为上文说的只开启SSL加密通信。
	`auto-tls` 表示在服务端没有配置参数 `ssl-cert` 和 `ssl-key` 时，服务端会自动签发这两个证书，以支持TiDB的安全连接，但不提供 CA 证书进行客户端证书验证。有关证书验证和控制证书生成方式的说明，请参考下面配置 `ssl-cert`、`ssl-key` 和 `ssl-ca` 变量，以及系统变量 `require_secure_transport` 的建议：

[ljun0712]

配置示例，请在本章节的最后添加。对比仅开启加密传输和强制要求校验客户端证书两种方式。添加的示例例如：

• 只开启 TLS 加密传输，在 config 文件或命令行参数中设置：

  ssl-ca = "/path/root.crt"
  ssl-cert = "/path/tidb.crt"
  ssl-key = "/path/tidb.key"
  

• 服务端强制校验客户端证书，在配置了参数 ssl-cert，ssl-key 和 ssl-ca 的基础上，修改系统变量 require_secure_transport：

SET GLOBAL require_secure_transport = ON;

[qiancai]

Hi @hecao100, would you please check the above comments from ljun0712? Thanks.

[rpaik]

Hi @hecao100, could you check the review comments above? We'd like to get this PR merged before February 1, so that you also score points for merged PRs. 😄

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