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#Set the terraform required version
terraform {
required_version = "~> 1.0"
# Configure the Azure Provider
required_providers {
# It is recommended to pin to a given version of the Provider
azurerm = {
source = "hashicorp/azurerm"
version = "~> 3.0.0"
}
local = {
version = "~> 1.4"
}
}
}
# Configure the Azure Provider
provider "azurerm" {
# It is recommended to pin to a given version of the Provider
features {
resource_group {
prevent_deletion_if_contains_resources = false
}
}
}
# Make client_id, tenant_id, subscription_id and object_id variables
data "azurerm_client_config" "current" {}
variable "prefix" {
type = string
}
variable "location" {
type = string
description = "Azure region where to create resources."
default = "West US 2"
}
variable "sp_client_id" {
type = string
description = "The Client ID for the service principal to use when setting up the Logic App connector to Event Grid"
}
variable "sp_client_secret" {
type = string
description = "The Client Secret for the service principal to use when setting up the Logic App connector to Event Grid"
}
resource "azurerm_resource_group" "rg" {
name = "${var.prefix}-serverless-sample"
location = var.location
tags = {
sample = "serverless-keyvault-secret-rotation-handling"
}
}
##################################################################################
# AppInsights
##################################################################################
resource "azurerm_log_analytics_workspace" "loganalyticsai1" {
name = "${var.prefix}-serverless-law-ai-first"
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
sku = "PerGB2018"
retention_in_days = 30
tags = {
sample = "serverless-keyvault-secret-rotation-handling"
}
}
resource "azurerm_application_insights" "logging" {
name = "${var.prefix}-serverless-ai-first"
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
workspace_id = azurerm_log_analytics_workspace.loganalyticsai1.id
application_type = "web"
tags = {
sample = "serverless-keyvault-secret-rotation-handling"
}
}
resource "azurerm_log_analytics_workspace" "loganalyticsai2" {
name = "${var.prefix}-serverless-law-ai-second"
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
sku = "PerGB2018"
retention_in_days = 30
tags = {
sample = "serverless-keyvault-secret-rotation-handling"
}
}
resource "azurerm_application_insights" "logging2" {
name = "${var.prefix}-serverless-ai-second"
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
workspace_id = azurerm_log_analytics_workspace.loganalyticsai2.id
application_type = "web"
tags = {
sample = "serverless-keyvault-secret-rotation-handling"
}
}
##################################################################################
# Function App
##################################################################################
resource "azurerm_storage_account" "fxnstor" {
name = lower("${var.prefix}stor")
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
account_tier = "Standard"
account_replication_type = "LRS"
account_kind = "StorageV2"
tags = {
sample = "serverless-keyvault-secret-rotation-handling"
}
}
resource "azurerm_service_plan" "fxnapp" {
name = "${var.prefix}-serverless-serviceplan"
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
sku_name = "Y1"
os_type = "Windows"
tags = {
sample = "serverless-keyvault-secret-rotation-handling"
}
}
resource "azurerm_windows_function_app" "fxn" {
name = "${var.prefix}-serverless-functionapp"
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
service_plan_id = azurerm_service_plan.fxnapp.id
storage_account_name = azurerm_storage_account.fxnstor.name
storage_account_access_key = azurerm_storage_account.fxnstor.primary_access_key
functions_extension_version = "~4"
site_config {}
identity {
type = "SystemAssigned"
}
lifecycle {
ignore_changes = [
app_settings
]
}
tags = {
sample = "serverless-keyvault-secret-rotation-handling"
}
}
##################################################################################
# Key Vault
##################################################################################
resource "azurerm_key_vault" "shared_key_vault" {
name = "${var.prefix}-serverless-kv"
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
tenant_id = data.azurerm_client_config.current.tenant_id
sku_name = "standard"
# access policy for creator
access_policy {
object_id = data.azurerm_client_config.current.object_id
tenant_id = data.azurerm_client_config.current.tenant_id
key_permissions = [
"Get",
"List",
"Create",
"Delete"
]
secret_permissions = [
"Get",
"List",
"Set",
"Delete",
"Purge"
]
}
# access policy for azure function
access_policy {
object_id = azurerm_windows_function_app.fxn.identity[0].principal_id
tenant_id = data.azurerm_client_config.current.tenant_id
secret_permissions = [
"Get"
]
}
tags = {
sample = "serverless-keyvault-secret-rotation-handling"
}
}
#############################
# Secrets
#############################
resource "azurerm_key_vault_secret" "logging_app_insights_key" {
name = "appinsights-instrumentationkey"
value = azurerm_application_insights.logging.instrumentation_key
key_vault_id = azurerm_key_vault.shared_key_vault.id
tags = {
sample = "serverless-keyvault-secret-rotation-handling"
}
}
##################################################################################
# Logic App
##################################################################################
resource "azurerm_log_analytics_workspace" "loganalytics" {
name = "${var.prefix}-serverless-law-logicapp"
resource_group_name = azurerm_resource_group.rg.name
location = azurerm_resource_group.rg.location
sku = "PerGB2018"
retention_in_days = 30
tags = {
sample = "serverless-keyvault-secret-rotation-handling"
}
}
locals {
parameters_body = {
logicapp_keyvaulthandler_name = {
value = "${var.prefix}-serverless-la"
},
vaults_rollingvault_externalid = {
value = azurerm_key_vault.shared_key_vault.id
},
vaults_rollingvault_name = {
value = azurerm_key_vault.shared_key_vault.name
},
subscriptionId = {
value = data.azurerm_client_config.current.subscription_id
},
diagnosticSettings_name = {
value = azurerm_log_analytics_workspace.loganalytics.name
},
log_analytics_workspace_id = {
value = azurerm_log_analytics_workspace.loganalytics.id
},
fxn_id = {
value = azurerm_windows_function_app.fxn.id
},
keysToWatch = {
value = [azurerm_key_vault_secret.logging_app_insights_key.name]
},
client_id = {
value = var.sp_client_id
},
client_secret = {
value = var.sp_client_secret
}
}
}
resource "azurerm_resource_group_template_deployment" "logicapp" {
name = "${var.prefix}-serverless-la-deployment"
resource_group_name = azurerm_resource_group.rg.name
deployment_mode = "Incremental"
parameters_content = jsonencode(local.parameters_body)
template_content = <<LOGICAPP
{
"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"logicapp_keyvaulthandler_name": {
"type": "String"
},
"vaults_rollingvault_externalid": {
"type": "String"
},
"vaults_rollingvault_name": {
"type": "String"
},
"subscriptionId": {
"type": "String"
},
"location": {
"defaultValue": "[resourceGroup().location]",
"type": "String"
},
"diagnosticSettings_name": {
"type": "String"
},
"log_analytics_workspace_id": {
"type": "String"
},
"connections_azureeventgrid_name": {
"defaultValue": "azureeventgrid",
"type": "String"
},
"fxn_id": {
"type": "String"
},
"keysToWatch": {
"type": "array"
},
"client_id": {
"type": "string"
},
"client_secret": {
"type": "string"
}
},
"variables": {},
"resources": [
{
"type": "Microsoft.Web/connections",
"apiVersion": "2016-06-01",
"name": "[parameters('connections_azureeventgrid_name')]",
"location": "[parameters('location')]",
"tags": {
"sample": "serverless-keyvault-secret-rotation-handling"
},
"properties": {
"displayName": "Event Grid Connection",
"customParameterValues": {},
"api": {
"id": "[concat('/subscriptions/', parameters('subscriptionId'), '/providers/Microsoft.Web/locations/', parameters('location'), '/managedApis/azureeventgrid')]"
},
"parameterValues": {
"token:TenantId": "[subscription().tenantId]",
"token:clientId": "[parameters('client_id')]",
"token:clientSecret": "[parameters('client_secret')]",
"token:grantType": "client_credentials"
}
}
},
{
"type": "Microsoft.Logic/workflows",
"apiVersion": "2017-07-01",
"name": "[parameters('logicapp_keyvaulthandler_name')]",
"tags": {
"sample": "serverless-keyvault-secret-rotation-handling"
},
"location": "[parameters('location')]",
"dependsOn": [
"[parameters('connections_azureeventgrid_name')]"
],
"identity": {
"type": "SystemAssigned"
},
"properties": {
"state": "Enabled",
"definition": {
"$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"$connections": {
"defaultValue": {},
"type": "Object"
}
},
"triggers": {
"When_a_key_vault_key_is_updated": {
"splitOn": "@triggerBody()",
"type": "ApiConnectionWebhook",
"inputs": {
"body": {
"properties": {
"destination": {
"endpointType": "webhook",
"properties": {
"endpointUrl": "@{listCallbackUrl()}"
}
},
"filter": {
"includedEventTypes": [
"Microsoft.KeyVault.SecretNewVersionCreated"
]
},
"topic": "[parameters('vaults_rollingvault_externalid')]"
}
},
"host": {
"connection": {
"name": "@parameters('$connections')['azureeventgrid']['connectionId']"
}
},
"path": "[concat('/subscriptions/@{encodeURIComponent(''', parameters('subscriptionId'), ''')}/providers/@{encodeURIComponent(''Microsoft.KeyVault.vaults'')}/resource/eventSubscriptions')]",
"queries": {
"x-ms-api-version": "2017-06-15-preview"
}
}
}
},
"actions": {
"Condition": {
"actions": {
"Get_Current_AppSettings": {
"inputs": {
"authentication": {
"type": "ManagedServiceIdentity"
},
"method": "POST",
"uri": "[concat('https://management.azure.com', parameters('fxn_id'), '/config/appsettings/list?api-version=2021-02-01')]"
},
"runAfter": {
"NewSecretVersion": [
"Succeeded"
]
},
"type": "Http"
},
"NewSecretVersion": {
"inputs": "@triggerBody()?['data'].Version",
"runAfter": {},
"type": "Compose"
},
"Parse_AppSettings_Response": {
"inputs": {
"content": "@body('Get_Current_AppSettings')",
"schema": {
"properties": {
"id": {
"type": "string"
},
"location": {
"type": "string"
},
"name": {
"type": "string"
},
"properties": {
"properties": {
"APPINSIGHTS_INSTRUMENTATIONKEY": {
"type": "string"
},
"AzureWebJobsDashboard": {
"type": "string"
},
"AzureWebJobsStorage": {
"type": "string"
},
"FUNCTIONS_EXTENSION_VERSION": {
"type": "string"
},
"WEBSITE_CONTENTAZUREFILECONNECTIONSTRING": {
"type": "string"
},
"WEBSITE_CONTENTSHARE": {
"type": "string"
}
},
"type": "object"
},
"tags": {
"properties": {
"sample": {
"type": "string"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"type": "object"
}
},
"runAfter": {
"Get_Current_AppSettings": [
"Succeeded"
]
},
"type": "ParseJson"
},
"Update_secret_version_app_setting": {
"inputs": {
"authentication": {
"type": "ManagedServiceIdentity"
},
"body": {
"properties": "[concat('@setProperty(body(''Parse_AppSettings_Response'')?[''properties''], ''APPINSIGHTS_INSTRUMENTATIONKEY'', concat(''@Microsoft.KeyVault(SecretUri=https://'', ''',parameters('vaults_rollingvault_name'), ''', ''.vault.azure.net/secrets/appinsights-instrumentationkey/'', outputs(''NewSecretVersion''), '')''))')]"
},
"method": "PUT",
"uri": "[concat('https://management.azure.com', parameters('fxn_id'), '/config/appsettings?api-version=2021-02-01')]"
},
"runAfter": {
"Parse_AppSettings_Response": [
"Succeeded"
]
},
"type": "Http"
}
},
"else": {
"actions": {
"Terminate": {
"inputs": {
"runStatus": "Cancelled"
},
"runAfter": {},
"type": "Terminate"
}
}
},
"expression": {
"and": [
{
"contains": [
"@variables('keysToWatch')",
"@triggerBody()?['subject']"
]
}
]
},
"runAfter": {
"Init_keysToWatch": [
"Succeeded"
]
},
"type": "If"
},
"Init_keysToWatch": {
"inputs": {
"variables": [
{
"name": "keysToWatch",
"type": "array",
"value": "[parameters('keysToWatch')]"
}
]
},
"runAfter": {},
"type": "InitializeVariable"
}
},
"outputs": {}
},
"parameters": {
"$connections": {
"value": {
"azureeventgrid": {
"connectionId": "[resourceId('Microsoft.Web/connections', parameters('connections_azureeventgrid_name'))]",
"connectionName": "azureeventgrid",
"id": "[concat('/subscriptions/', parameters('subscriptionId'), '/providers/Microsoft.Web/locations/', parameters('location'), '/managedApis/azureeventgrid')]"
}
}
}
}
},
"resources": [
{
"type": "providers/diagnosticSettings",
"name": "[concat('Microsoft.Insights/', parameters('diagnosticSettings_name'))]",
"dependsOn": [
"[parameters('logicapp_keyvaulthandler_name')]"
],
"apiVersion": "2017-05-01-preview",
"properties": {
"name": "[parameters('diagnosticSettings_name')]",
"workspaceId": "[parameters('log_analytics_workspace_id')]",
"logs": [
{
"category": "WorkflowRuntime",
"enabled": true,
"retentionPolicy": {
"days": 0,
"enabled": false
}
}
],
"metrics": [
{
"category": "AllMetrics",
"enabled": false,
"retentionPolicy": {
"days": 0,
"enabled": false
}
}
]
}
}
]
}
],
"outputs": {
"logicAppServicePrincipalId": {
"type": "string",
"value": "[reference(concat('Microsoft.Logic/workflows/',parameters('logicapp_keyvaulthandler_name')), '2019-05-01', 'Full').identity.principalId]"
}
}
}
LOGICAPP
}
##################################################################################
# Role Assignment
##################################################################################
resource "azurerm_role_assignment" "laToFunction" {
scope = azurerm_windows_function_app.fxn.id
role_definition_name = "Website Contributor"
principal_id = jsondecode(azurerm_resource_group_template_deployment.logicapp.output_content).logicAppServicePrincipalId.value
}
##################################################################################
# Outputs
##################################################################################
output "AppInsightsKey-First" {
value = azurerm_application_insights.logging.instrumentation_key
sensitive = true
}
output "AppInsightsKey-Second" {
value = azurerm_application_insights.logging2.instrumentation_key
sensitive = true
}
resource "local_file" "app_deployment_script" {
filename = "./deploy_app.sh"
content = <<CONTENT
#!/bin/bash
echo "Setting app insights instrumentation key on function app ..."
az functionapp config appsettings set -n ${azurerm_windows_function_app.fxn.name} -g ${azurerm_resource_group.rg.name} --settings "APPINSIGHTS_INSTRUMENTATIONKEY=""@Microsoft.KeyVault(SecretUri=https://${azurerm_key_vault.shared_key_vault.name}.vault.azure.net/secrets/${azurerm_key_vault_secret.logging_app_insights_key.name}/)""" > /dev/null
az functionapp config set --net-framework-version v6.0 -n ${azurerm_windows_function_app.fxn.name} -g ${azurerm_resource_group.rg.name}
echo "Deploying function code ..."
cd ../src ; func azure functionapp publish ${azurerm_windows_function_app.fxn.name} --csharp > /dev/null ; cd ../terraform
echo "Application Insights keys:"
terraform state pull | jq -r '.outputs | to_entries | .[] | { instance: .key, key: .value.value } '
echo
echo "Done!"
CONTENT
}