应用网关应用服务访问限制

Question

我已经使用 terraform 在 Azure 中实现了一个应用程序网关。

我的 terraform 代码构建了一个通风口、应用程序网关、子网、应用程序服务和应用程序服务计划。

一切正常，我可以使用应用程序网关 public ip 访问应用程序服务。唯一的问题是我也可以从它自己的端点访问应用服务，我想限制这种访问只能通过我的应用程序网关，所以如果有人试图直接访问应用服务，它应该得到一个 403 错误。

经过一些研究，我设法从终端 >> 应用服务 >> 网络实现了这一点

但我想使用 terraform 自动执行此过程。这是我被困住的地方。

因为我找到的唯一来源是指 "azurerm_app_service_slot_virtual_network_swift_connection"，但该资源需要一个我不想要或不需要的应用服务槽。

我想知道，如何对应用服务实施网络访问限制？

这是我的代码以及我如何构建我的基础设施：

networking.tf

locals {
  cidr_block = "<cidr>"
  subnets = {
    frontend = cidrsubnet(local.cidr_block, 8, 0)
  }
}
#########################################
# RESOURCE GROUP
#########################################
resource "azurerm_resource_group" "example" {
  name     = "rg-hri-prd-app-gateway"
  location = "West US"
}

#########################################
# VIRTUAL NETWORK
#########################################
resource "azurerm_virtual_network" "example" {
  name                = "hri-prd-vnet"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location
  address_space       = [local.cidr_block]
}

#########################################
# SUBNETS
#########################################

resource "azurerm_subnet" "example" {
  count                = length(keys(local.subnets))
  name                 = keys(local.subnets)[count.index]
  resource_group_name  = azurerm_resource_group.example.name
  virtual_network_name = azurerm_virtual_network.example.name
  address_prefixes     = [local.subnets[keys(local.subnets)[count.index]]]
  service_endpoints = ["Microsoft.Web"]
  delegation {
    name = "my-access-delegation"
    service_delegation {
      name    = "Microsoft.Web/serverFarms"
      actions = ["Microsoft.Network/virtualNetworks/subnets/action"]
    }
  }
}

resource "azurerm_app_service_virtual_network_swift_connection" "appservice-subnet" {
  count = length(azurerm_app_service.example)
  app_service_id = azurerm_app_service.example[count.index].id
  subnet_id = azurerm_subnet.example[count.index].id
}

app.tf

locals {
  app_services = [
    {
      kind = "Linux"
      sku = {
        tier = "Standard"
        size = "S1"
      }
    }
  ]
}
#########################################
# APP SERVICE PLAN
#########################################
resource "azurerm_app_service_plan" "example" {
  count               = length(local.app_services)
  name                = "${lower(local.app_services[count.index].kind)}-asp"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  kind                = local.app_services[count.index].kind
  reserved            = true

  sku {
    tier = local.app_services[count.index].sku.tier
    size = local.app_services[count.index].sku.size
  }
}

#########################################
# APP SERVICE PLAN
#########################################

resource "azurerm_app_service" "example" {
  count               = length(local.app_services)
  name                = "${lower(local.app_services[count.index].kind)}-appservice"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  app_service_plan_id = azurerm_app_service_plan.example[count.index].id

}

gateway.tf

locals {
  backend_probe_name = "${azurerm_virtual_network.example.name}-health"
  http_setting_name  = "${azurerm_virtual_network.example.name}-htst"
  public_ip_name     = "${azurerm_virtual_network.example.name}-public"
}


#########################################
# AZURE PUBLIC IP
#########################################

resource "azurerm_public_ip" "example" {
  name                = local.public_ip_name
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location
  allocation_method   = "Dynamic"
}

#########################################
# APPLICT
#########################################
resource "azurerm_application_gateway" "network" {
  depends_on          = [azurerm_public_ip.example]
  name                = "hri-prd-appgateway"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location

  sku {
    name     = "Standard_Small"
    tier     = "Standard"
    capacity = 2
  }

  gateway_ip_configuration {
    name      = "my-gateway-ip-configuration"
    subnet_id = azurerm_subnet.example.0.id
  }

  dynamic "frontend_port" {
    for_each = azurerm_app_service.example
    content {
      name = "${azurerm_virtual_network.example.name}-${frontend_port.value.name}-feport"
      port = "808${frontend_port.key}"
    }
  }

  frontend_ip_configuration {
    name                 = "${azurerm_virtual_network.example.name}-feip"
    public_ip_address_id = azurerm_public_ip.example.id
  }

  dynamic "backend_address_pool" {
    for_each = azurerm_app_service.example
    content {
      name  = "${azurerm_virtual_network.example.name}-${backend_address_pool.value.name}-beap"
      fqdns = [backend_address_pool.value.default_site_hostname]
    }
  }

  probe {
    name                                      = local.backend_probe_name
    protocol                                  = "Http"
    path                                      = "/"
    interval                                  = 30
    timeout                                   = 120
    unhealthy_threshold                       = 3
    pick_host_name_from_backend_http_settings = true
    match {
      body        = "Welcome"
      status_code = [200, 399]
    }
  }

  backend_http_settings {
    name                                = local.http_setting_name
    probe_name                          = local.backend_probe_name
    cookie_based_affinity               = "Disabled"
    path                                = "/"
    port                                = 80
    protocol                            = "Http"
    request_timeout                     = 120
    pick_host_name_from_backend_address = true
  }

  dynamic "http_listener" {
    for_each = azurerm_app_service.example
    content {
      name                           = "${azurerm_virtual_network.example.name}-${http_listener.value.name}-httplstn"
      frontend_ip_configuration_name = "${azurerm_virtual_network.example.name}-feip"
      frontend_port_name             = "${azurerm_virtual_network.example.name}-${http_listener.value.name}-feport"
      protocol                       = "Http"
    }
  }

  dynamic "request_routing_rule" {
    for_each = azurerm_app_service.example
    content {
      name                       = "${azurerm_virtual_network.example.name}-${request_routing_rule.value.name}-rqrt"
      rule_type                  = "Basic"
      http_listener_name         = "${azurerm_virtual_network.example.name}-${request_routing_rule.value.name}-httplstn"
      backend_address_pool_name  = "${azurerm_virtual_network.example.name}-${request_routing_rule.value.name}-beap"
      backend_http_settings_name = local.http_setting_name
    }
  }
}

如果有人能帮助理解如何使用 terraform 实现这一点，请帮忙。

编辑：

我用 azure_app_service_network_swift_connection 更新了我的网络代码，但是当我运行 terraform 时，我收到以下错误：

Error: creating/updating Application Gateway: (Name "hri-prd-appgateway" / Resource Group "rg-hri-prd-app-gateway"): network.ApplicationGatewaysClient#CreateOrUpdate: Failure sending request: StatusCode=0 -- Original Error: Code="ResourceNotPermittedOnDelegatedSubnet" Message="Resource /subscriptions/<subscription>/resourceGroups/rg-hri-prd-app-gateway/providers/Microsoft.Network/applicationGateways/hri-prd-appgateway cannot be created in or updated to use the subnet /subscriptions/<subscription>/resourceGroups/rg-hri-prd-app-gateway/providers/Microsoft.Network/virtualNetworks/hri-prd-vnet/subnets/frontend since it has delegation(s) [Microsoft.Web/serverFarms: /subscriptions/<subscription>/resourceGroups/rg-hri-prd-app-gateway/providers/Microsoft.Network/virtualNetworks/hri-prd-vnet/subnets/frontend/delegations/my-access-delegation] to external services." Details=[]

  on gateway.tf line 22, in resource "azurerm_application_gateway" "network":
  22: resource "azurerm_application_gateway" "network" {

Answer 1

如果要限制 Web 应用，使其仅接收来自应用程序网关的流量，一种方法是使用 Azure 应用服务静态 IP 限制。使用该方式后，如果根据列表中的规则不允许访问该地址，则服务回复HTTP 403状态码。详细信息请参考here and here

关于terraform如何实现，请参考以下脚本

site_config {
   ...
    always_on                = true

    ip_restriction {
      ip_address  = ""
      priority=
    }

   

# etc.

更多信息请参考here and here

应用网关应用服务访问限制

Application gateway app service access restriction

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