DNS CAA

DNS Certification Authority Authorization

DNS 憑證頒發機構授權，簡稱：CAA

一種網際網路安全政策機制，允許域名持有人指定可以為其域簽發憑證的憑證頒發機構。

該政策憑藉一個新的域名系統資源記錄「CAA」來實現。

DNS 設定

• 禁用憑證 - 單一位址

@	IN	CAA	0 issue ";"

• 禁用憑證 - Wildcard

@	IN	CAA	0 issuewild ";"

• Let's Encrypt 免費憑證

@	IN	CAA	0 issue "letsencrypt.org"

• Gandi SSL 憑證 - 單一位址

@	IN	CAA	0 issue "sectigo.com"

• Gandi SSL 憑證 - Wildcard

@	IN	CAA	0 issuewild "sectigo.com"

• IODEF - E-Mail

@	IN	CAA	0 iodef "mailto:iodef@donnet.email"

• IODEF - API

@	IN	CAA	0 iodef "http://api.opensoft.cc/iodef/report.aspx"

Windows DNS 設定

Windows DNS 沒有支援 CAA

• 禁用憑證 - 單一位址

@	IN	TYPE257	\# 8 000569737375653B

• 禁用憑證 - Wildcard

@	IN	TYPE257	\# 12 0009697373756577696C643B

• Let's Encrypt 免費憑證

@	IN	TYPE257	\# 22 000569737375656C657473656E63727970742E6F7267

• Gandi SSL 憑證 - 單一位址

@	IN	TYPE257	\# 18 000569737375657365637469676F2E636F6D

• Gandi SSL 憑證 - Wildcard 多重域名

@	IN	TYPE257	\# 22 0009697373756577696C647365637469676F2E636F6D

• IODEF - E-Mail

@	IN	TYPE257	\# 32 0005696F6465666D61696C746F3A696F64656640646F6E6E65742E656D61696C

• IODEF - API

@	IN	TYPE257	\# 47 0005696F646566687474703A2F2F6170692E6F70656E736F66742E63632F696F6465662F7265706F72742E61737078