端口范围的 Azure Policy 支持答案

【问题标题】：Azure Policy Support for Port Ranges端口范围的 Azure Policy 支持
【发布时间】：2020-03-17 18:26:55
【问题描述】：

问题 - 所以我想阻止人们创建开放 Internet 访问某些端口（22、3389 等）的 NSG。我可以创建一个策略来阻止特定端口，例如，

{
"allOf": [{
        "field": "Microsoft.Network/networkSecurityGroups/securityRules/access",
        "equals": "Allow"
    },
    {
        "field": "Microsoft.Network/networkSecurityGroups/securityRules/direction",
        "equals": "Inbound"
    },
    {
        "anyOf": [{
                "field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange",
                "equals": "22"
            },
            {
                "field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange",
                "equals": "3389"
            }
        ]
    }
]

如果在安全规则中使用特定端口，这将阻止创建 NSG。但如果有人创建了允许端口范围（例如 3300-3400）的 NSG 规则，则可以绕过它。

想知道策略如何处理端口范围以及在这种情况下最好的方法是什么。

我尝试了 destinationPortRanges[*] 数组，但它不起作用。

{
"not": {
    "field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]",
    "Equals": "22"
}

}

当 destinationPortRanges 指定为“20-25”时，该规则仍允许创建 NSG。

【问题讨论】：

标签： azure azure-policy

【解决方案1】：

查看内置策略“RDP access from the Internet should be blocked”。还有SSH access from the Internet should be blocked。

说实话，读起来很痛苦，但看起来它正好涵盖了你需要的东西。

{
                "anyOf": [
                  {
                    "field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange",
                    "equals": "*"
                  },
                  {
                    "field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange",
                    "equals": "3389"
                  },
                  {
                    "value": "[if(and(not(empty(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange'))), contains(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange'),'-')), and(lessOrEquals(int(first(split(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange'), '-'))),3389),greaterOrEquals(int(last(split(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange'), '-'))),3389)), 'false')]",
                    "equals": "true"
                  },
                  {
                      "count": {
                        "field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]",
                        "where": {
                          "value": "[if(and(not(empty(first(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]')))), contains(first(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]')),'-')), and(lessOrEquals(int(first(split(first(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]')), '-'))),3389),greaterOrEquals(int(last(split(first(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]')), '-'))),3389)) , 'false')]",
                          "equals": "true"
                        }
                      },
                      "greater": 0
                  },
                  {
                    "not": {
                      "field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]",
                      "notEquals": "*"
                    }
                  },
                  {
                    "not": {
                      "field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]",
                      "notEquals": "3389"
                    }
                  }
                ]
              },

【讨论】：