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# 证书策略示例
<a name="certificate-policy-examples"></a>

对于在注册 AWS IoT Core 表中注册的设备，以下策略授予 AWS IoT Core 使用与事物名称匹配的客户端 ID 进行连接的权限，以及向名称等于该设备用于进行自我身份验证`certificateId`的证书的主题发布的权限：

****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "iot:Publish"
            ],
            "Resource": ["arn:aws:iot:us-east-1:123456789012:topic/${iot:CertificateId}"]
        },
        {
            "Effect": "Allow",
            "Action": [
                "iot:Connect"
            ],
            "Resource": ["arn:aws:iot:us-east-1:123456789012:client/${iot:Connection.Thing.ThingName}"]
        }
    ]
}
```

对于未在注册 AWS IoT Core 表中注册的设备，以下策略授予使用客户端 IDs、`client1``client2`、`client3`和 AWS IoT Core 进行连接的权限，以及发布到名称等于设备用于进行自我身份验证`certificateId`的证书的主题的权限：

****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "iot:Publish"
            ],
            "Resource": ["arn:aws:iot:us-east-1:123456789012:topic/${iot:CertificateId}"]
        },
        {
            "Effect": "Allow",
            "Action": [
                "iot:Connect"
            ],
            "Resource": [
                "arn:aws:iot:us-east-1:123456789012:client/client1",
                "arn:aws:iot:us-east-1:123456789012:client/client2",
                "arn:aws:iot:us-east-1:123456789012:client/client3"
            ]
        }
    ]
}
```

对于在注册 AWS IoT Core 表中注册的设备，以下策略授予 AWS IoT Core 使用与事物名称匹配的客户端 ID 进行连接的权限，以及向名称等于该设备进行身份验证的证书主题`CommonName`字段的主题发布权限：

****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "iot:Publish"
            ],
            "Resource": ["arn:aws:iot:us-east-1:123456789012:topic/${iot:Certificate.Subject.CommonName}"]
        },
        {
            "Effect": "Allow",
            "Action": [
                "iot:Connect"
            ],
            "Resource": ["arn:aws:iot:us-east-1:123456789012:client/${iot:Connection.Thing.ThingName}"]
        }
    ]
}
```

**注意**  
在此示例中，证书的使用者公用名用作主题标识符，并假设使用者公用名对于每个已注册的证书都是唯一的。如果证书在多个设备之间共享，则共享此证书的所有设备的使用者公用名将相同，因而允许从多个设备向同一主题发布权限（不推荐）。

对于未在注册 AWS IoT Core 表中注册的设备，以下策略授予 AWS IoT Core 与客户端 IDs、`client1``client2`、`client3`和进行连接的权限，以及向名称等于该设备用于进行身份验证的证书主题`CommonName`字段的主题发布的权限：

****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "iot:Publish"
            ],
            "Resource": ["arn:aws:iot:us-east-1:123456789012:topic/${iot:Certificate.Subject.CommonName}"]
        },
        {
            "Effect": "Allow",
            "Action": [
                "iot:Connect"
            ],
            "Resource": [
                "arn:aws:iot:us-east-1:123456789012:client/client1",
                "arn:aws:iot:us-east-1:123456789012:client/client2",
                "arn:aws:iot:us-east-1:123456789012:client/client3"
            ]
        }
    ]
}
```

**注意**  
在此示例中，证书的使用者公用名用作主题标识符，并假设使用者公用名对于每个已注册的证书都是唯一的。如果证书在多个设备之间共享，则共享此证书的所有设备的使用者公用名将相同，因而允许从多个设备向同一主题发布权限（不推荐）。

对于在注册 AWS IoT Core 表中注册的设备，以下策略授予使用 AWS IoT Core 与事物名称匹配的客户端 ID 进行连接的权限，以及在用于对设备进行身份验证的证书的`Subject.CommonName.2`字段设置为`admin/`时向名称前缀为的主题发布权限：`Administrator`

****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "iot:Connect"
            ],
            "Resource": ["arn:aws:iot:us-east-1:123456789012:client/${iot:Connection.Thing.ThingName}"]
        },
        {
            "Effect": "Allow",
            "Action": [
                "iot:Publish"
            ],
            "Resource": ["arn:aws:iot:us-east-1:123456789012:topic/admin/*"],
            "Condition": {
                "StringEquals": {
                    "iot:Certificate.Subject.CommonName.2": "Administrator"
            }
        }
        }
    ]
}
```

对于未在注册 AWS IoT Core 表中注册的设备，当用于对设备进行身份验证的证书的`Subject.CommonName.2`字段设置为`admin/`时 IDs `client1`，以下策略授予 AWS IoT Core 与客户端`client2`、`client3`和发布到名称前缀为的主题的权限：`Administrator`

****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "iot:Connect"
            ],
            "Resource": [
                "arn:aws:iot:us-east-1:123456789012:client/client1",
                "arn:aws:iot:us-east-1:123456789012:client/client2",
                "arn:aws:iot:us-east-1:123456789012:client/client3"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "iot:Publish"
            ],
            "Resource": ["arn:aws:iot:us-east-1:123456789012:topic/admin/*"],
            "Condition": {
                "StringEquals": {
                    "iot:Certificate.Subject.CommonName.2": "Administrator"
            }
        }
        }
    ]
}
```

对于在注册 AWS IoT Core 表中注册的设备，以下策略允许设备使用其事物名称发布特定主题，该主题包括用于对设备进行身份验证的证书`ThingName`何时将其任何一个`Subject.CommonName`字段设置为`Administrator`：`admin/`

****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "iot:Connect"
            ],
            "Resource": ["arn:aws:iot:us-east-1:123456789012:client/${iot:Connection.Thing.ThingName}"]
        },
        {
            "Effect": "Allow",
            "Action": [
                "iot:Publish"
            ],
            "Resource": ["arn:aws:iot:us-east-1:123456789012:topic/admin/${iot:Connection.Thing.ThingName}"],
            "Condition": {
                "ForAnyValue:StringEquals": {
                    "iot:Certificate.Subject.CommonName.List": "Administrator"
            }
        }
        }
    ]
}
```

对于未在注册 AWS IoT Core 表中注册的设备，以下策略授予在用于对 AWS IoT Core 设备进行身份验证的证书的任意一个`Subject.CommonName`字段设置为`admin`时连接到客户端 IDs `client1``client2`、`client3`和向主题发布的权限`Administrator`：

****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "iot:Connect"
            ],
            "Resource": [
                "arn:aws:iot:us-east-1:123456789012:client/client1",
                "arn:aws:iot:us-east-1:123456789012:client/client2",
                "arn:aws:iot:us-east-1:123456789012:client/client3"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "iot:Publish"
            ],
            "Resource": ["arn:aws:iot:us-east-1:123456789012:topic/admin"],
            "Condition": {
                "ForAnyValue:StringEquals": {
                    "iot:Certificate.Subject.CommonName.List": "Administrator"
            }
        }
        }
    ]
}
```