使用SSL安全链接Mysql数据库

2021-10-14 21:41:32

一、使用SSL安全连接

To use SSL connections between the MySQL server and client programs, your system must support either OpenSSL or yaSSL and your version of MySQL must be built with SSL support.

To make it easier to use secure connections, MySQL is bundled with yaSSL as of MySQL 5.0.10. (MySQL and yaSSL employ the same licensing model, whereas OpenSSL uses an Apache-style license.) yaSSL support initially was available only for a few platforms, but now it is available on all platforms supported by MySQL AB.

To get secure connections to work with MySQL and SSL, you must do the following:

If you are not using a binary (precompiled) version of MySQL that has been built with SSL support, and you are going to use OpenSSL rather than the bundled yaSSL library, install OpenSSL if it has not already been installed. We have tested MySQL with OpenSSL 0.9.6. To obtain OpenSSL, visit http://www.openssl.org.
If you are not using a binary (precompiled) version of MySQL that has been built with SSL support, configure a MySQL source distribution to use SSL. When you configure MySQL, invoke the configure script with the appropriate option to select the SSL library that you want to use.

For yaSSL:
```
shell> ./configure --with-yassl 
```
For OpenSSL:
```
shell> ./configure --with-openssl 
```
Before MySQL 5.0, it was also neccessary to use --with-vio, but that option is no longer required.

Note that yaSSL support on Unix platforms requires that either /dev/urandom or /dev/random be available to retrieve true random numbers. For additional information (especially regarding yaSSL on Solaris versions prior to 2.8 and HP-UX)
Make sure that you have upgraded your grant tables to include the SSL-related columns in the mysql.user table. This is necessary if your grant tables date from a version of MySQL older than 4.0.
To check whether a server binary is compiled with SSL support, invoke it with the --ssl option. An error will occur if the server does not support SSL:
```
shell> mysqld --ssl --help
060525 14:18:52 [ERROR] mysqld: unknown option '--ssl'
```
To check whether a running mysqld server supports SSL, examine the value of the have_openssl system variable:
```
mysql> SHOW VARIABLES LIKE 'have_openssl';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| have_openssl  | YES   |
+---------------+-------+
```
If the value is YES, the server supports SSL connections. If the value is DISABLED, the server supports SSL connections but was not started with the appropriate --ssl-xxx options (described later in this section). If the value is YES, the server supports SSL connections.

To start the MySQL server so that it allows clients to connect via SSL, use the options that identify the key and certificate files the server needs when establishing a secure connection:

shell> mysqld --ssl-ca=cacert.pem /
--ssl-cert=server-cert.pem /
--ssl-key=server-key.pem

一般情况下mysql服务器会随开机自启动，如果需要支持ssl，则修要修改配置文件/etc/mysql/my.cnf，
设置ssl-ca,ssl-cert,ssl-key. 然后/etc/init.d/mysql restart

--ssl-ca identifies the Certificate Authority (CA) certificate.
--ssl-cert identifies the server public key. This can be sent to the client and authenticated against the CA certificate that it has.
--ssl-key identifies the server private key.

To establish a secure connection to a MySQL server with SSL support, the options that a client must specify depend on the SSL requirements of the user account that the client uses.

If the account has no special SSL requirements or was created using a GRANT statement that includes the REQUIRE SSL option, a client can connect securely by using just the --ssl-ca option:

shell> mysql --ssl-ca=cacert.pem

To require that a client certificate also be specified, create the account using the REQUIRE X509 option. Then the client must also specify the proper client key and certificate files or the server will reject the connection:

shell> mysql --ssl-ca=cacert.pem /
--ssl-cert=client-cert.pem /
--ssl-key=client-key.pem

In other words, the options are similar to those used for the server. Note that the Certificate Authority certificate has to be the same.

A client can determine whether the current connection with the server uses SSL by checking the value of the Ssl_cipher status variable. The value of Ssl_cipher is non-empty if SSL is used, and empty otherwise. For example:

mysql> SHOW STATUS LIKE 'Ssl_cipher';
+---------------+--------------------+
| Variable_name | Value              |
+---------------+--------------------+
| Ssl_cipher    | DHE-RSA-AES256-SHA |
+---------------+--------------------+

For the mysql client, you can use the STATUS or /s command and check the SSL line:

mysql> /s
...
SSL:                    Not in use
...

Or:

mysql> /s
...
SSL:                    Cipher in use is DHE-RSA-AES256-SHA
...

To establish a secure connection from within an application program, use the mysql_ssl_set() C API function to set the appropriate certificate options before calling mysql_real_connect().

二、对数据库帐号设置不同的安全连接类型

There are a number of different possibilities for limiting connection types for a given account:

REQUIRE NONE indicates that the account has no SSL or X509 requirements. This is the default if no SSL-related REQUIRE options are specified. Unencrypted connections are allowed if the username and password are valid. However, encrypted connections can also be used, at the client's option, if the client has the proper certificate and key files. That is, the client need not specify any SSL commmand options, in which case the connection will be unencrypted. To use an encrypted connection, the client must specify either the --ssl-ca option, or all three of the --ssl-ca, --ssl-key, and --ssl-cert options.
The REQUIRE SSL option tells the server to allow only SSL-encrypted connections for the account.
```
GRANT ALL PRIVILEGES ON test.* TO 'root'@'localhost'
  IDENTIFIED BY 'goodsecret' REQUIRE SSL;
```
To connect, the client must specify the --ssl-ca option, and may additionally specify the --ssl-key and --ssl-cert options.
REQUIRE X509 means that the client must have a valid certificate but that the exact certificate, issuer, and subject do not matter. The only requirement is that it should be possible to verify its signature with one of the CA certificates.
```
GRANT ALL PRIVILEGES ON test.* TO 'root'@'localhost'
  IDENTIFIED BY 'goodsecret' REQUIRE X509;
```
To connect, the client must specify the --ssl-ca, --ssl-key, and --ssl-cert options. This is also true for ISSUER and SUBJECT because those REQUIRE options imply X509.
REQUIRE ISSUER 'issuer' places the restriction on connection attempts that the client must present a valid X509 certificate issued by CA 'issuer'. If the client presents a certificate that is valid but has a different issuer, the server rejects the connection. Use of X509 certificates always implies encryption, so the SSL option is unnecessary in this case.
```
GRANT ALL PRIVILEGES ON test.* TO 'root'@'localhost'
  IDENTIFIED BY 'goodsecret'
  REQUIRE ISSUER '/C=FI/ST=Some-State/L=Helsinki/
    O=MySQL Finland AB/CN=Tonu Samuel/Email=tonu@example.com';
```
Note that the 'issuer' value should be entered as a single string.
REQUIRE SUBJECT 'subject' places the restriction on connection attempts that the client must present a valid X509 certificate containing the subject subject. If the client presents a certificate that is valid but has a different subject, the server rejects the connection.
```
GRANT ALL PRIVILEGES ON test.* TO 'root'@'localhost'
  IDENTIFIED BY 'goodsecret'
  REQUIRE SUBJECT '/C=EE/ST=Some-State/L=Tallinn/
    O=MySQL demo client certificate/
    CN=Tonu Samuel/Email=tonu@example.com';
```
Note that the 'subject' value should be entered as a single string.
REQUIRE CIPHER 'cipher' is needed to ensure that ciphers and key lengths of sufficient strength are used. SSL itself can be weak if old algorithms using short encryption keys are used. Using this option, you can ask that a specific cipher method is used to allow a connection.
```
GRANT ALL PRIVILEGES ON test.* TO 'root'@'localhost'
  IDENTIFIED BY 'goodsecret'
  REQUIRE CIPHER 'EDH-RSA-DES-CBC3-SHA';
```

The SUBJECT, ISSUER, and CIPHER options can be combined in the REQUIRE clause like this:

GRANT ALL PRIVILEGES ON test.* TO 'root'@'localhost'
  IDENTIFIED BY 'goodsecret'
  REQUIRE SUBJECT '/C=EE/ST=Some-State/L=Tallinn/
    O=MySQL demo client certificate/
    CN=Tonu Samuel/Email=tonu@example.com'
  AND ISSUER '/C=FI/ST=Some-State/L=Helsinki/
    O=MySQL Finland AB/CN=Tonu Samuel/Email=tonu@example.com'
  AND CIPHER 'EDH-RSA-DES-CBC3-SHA';

The AND keyword is optional between REQUIRE options.

三、为Mysql制作ssl证书

This section demonstrates how to set up SSL certificate and key files for use by MySQL servers and clients. The first example shows a simplified procedure such as you might use from the command line. The second shows a script that contains more detail. Both examples use the openssl command that is part of OpenSSL.

The following example shows a set of commands to create MySQL server and client certificate and key files. You will need to respond to several prompts by the openssl commands. For testing, you can press Enter to all prompts. For production use, you should provide non-empty responses.

# Create clean environment
shell> rm -rf newcerts
shell> mkdir newcerts && cd newcerts

# Create CA certificate
shell> openssl genrsa 2048 > ca-key.pem
shell> openssl req -new -x509 -nodes -days 1000 /
-key ca-key.pem > ca-cert.pem

# Create server certificate
shell> openssl req -newkey rsa:2048 -days 1000 /
-nodes -keyout server-key.pem > server-req.pem
shell> openssl x509 -req -in server-req.pem -days 1000 /
-CA ca-cert.pem -CAkey ca-key.pem -set_serial 01 > server-cert.pem

# Create client certificate
shell> openssl req -newkey rsa:2048 -days 1000 /
-nodes -keyout client-key.pem > client-req.pem
shell> openssl x509 -req -in client-req.pem -days 1000 /
-CA ca-cert.pem -CAkey ca-key.pem -set_serial 01 > client-cert.pem

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