Azure Policy 对端口范围的支持

Question

问题 - 所以我想阻止人们创建开放某些端口(22、3389 等)的 Internet 访问的 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"
            }
        ]
    }
]

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

想知道政策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"
}

}

当目标端口范围指定为“20-25”时，该规则仍然允许创建 NSG。

Answer 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，但看起来它完全满足了你的需要。

{
                "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"
                    }
                  }
                ]
              },