======Openssl======
本範例以Centos6為基礎。
======建立根憑證======
  - 建立私鑰SSL key<code 1>#cd /etc/pki/tls/certs/</code><code 1>#openssl genrsa -des3 -out rootca.key 1024
輸入兩次密碼
</code>
  - 建立憑證申請書SSL CSR<code 1>#openssl req -new rootca.key -out root.csr
輸入一次密碼

ou are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [XX]:TW    #國碼
State or Province Name (full name) []:Taiwan R.O.C #完整州,地區名稱
Locality Name (eg, city) [Default City]:Taichung  #城市名
Organization Name (eg, company) [Default Company Ltd]:Qoop #公司名稱
Organizational Unit Name (eg, section) []:Salse  #組織單位
Common Name (eg, your name or your server's hostname) []:rpm32.Qoop.com #完整主機名稱
Email Address []:root@Qoop.com #聯絡的Mail

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []: #按Enter即可
An optional company name []: #按Enter即可
</code>
  - 建立RootCA自己簽發給自己 SSL crt<code 1>#openssl x509 -req -signkey rootca.key -in rootca.csr -out rootca.crt
Signature ok
subject=/C=TW/ST=Taiwan R.O.C/L=Taichung/O=Qoop/OU=Salse/CN=rpm32.Qoop.com/emailAddress=root@Qoop.com
Getting Private key
Enter pass phrase for rootca.key:  # 輸入第一步驟的密碼
</code>
======為伺服器建立專用的憑證======
  - SSL key: <code 1>#openssl genrsa -out server.key 1024
</code>
  - SSL CSR:<code 1>#openssl req -new -key server.key -out server.csr
與第二大項步驟一樣
~略~
Country Name (2 letter code) [XX]:TW
State or Province Name (full name) []:Taiwan R.O.C
Locality Name (eg, city) [Default City]:
~略~
</code>
  - SSL crt:<code 1>#openssl x509 -req -CAcreateserial -CAkey rootca.key -CA rootca.crt -in server.csr -out server.crt

Enter pass phrase for rootca.key: #輸入rootca.key的私鑰密碼
</code>
======參考資料======
  - [[http://benjr.tw/node/108|Benjr_CA]]
  - [[http://www.weithenn.org/cgi-bin/wiki.pl?OpenLDAP-Postfix_With_SMTP_SSL_TLS_%E8%A8%AD%E5%AE%9A#Heading4|OpenLDAP-Postfix With SMTP SSL TLS 設定]]
  - [[http://www.ichiayi.com/wiki/tech/openssl_caserver?s[]=ssl|OpenSSL 簽發憑證方式]]
  - [[http://security.nknu.edu.tw/textbook/|網路安全與實務理論-PGP/GnuPG-楊中皇]]