Storing keys and certificates in Azure - Mini Project: Build & Apply

Storing keys and certificates

📖 Scenario: You are setting up a secure cloud environment in Microsoft Azure. You need to store sensitive information like keys and certificates safely so that your applications can use them without exposing secrets.

🎯 Goal: Create an Azure Key Vault resource, add a key and a certificate to it, and configure access policies to allow an application to use them securely.

📋 What You'll Learn

Create an Azure Key Vault named exactly MySecureVault

Add a key named MyEncryptionKey with RSA type

Add a certificate named MySSLCertificate with a self-signed issuer

Set an access policy to allow an application with object ID 11111111-2222-3333-4444-555555555555 to get keys and certificates

💡 Why This Matters

🌍 Real World

Storing keys and certificates securely in Azure Key Vault is essential for protecting sensitive data and enabling secure application authentication and encryption.

💼 Career

Cloud engineers and security specialists often create and manage Key Vaults to safeguard secrets and control access in enterprise cloud environments.

1

Create the Azure Key Vault resource

Write an Azure Resource Manager (ARM) template snippet to create a Key Vault resource named MySecureVault in the eastus location with SKU family A and SKU name standard.

Azure

# Your code here

Hint

Use the resource type Microsoft.KeyVault/vaults and set the name to MySecureVault.

2

Add a key and a certificate to the Key Vault

Add two child resources inside the resources array of MySecureVault: a key named MyEncryptionKey of type RSA, and a certificate named MySSLCertificate with a self-signed issuer.

Azure

{
  "type": "Microsoft.KeyVault/vaults",
  "apiVersion": "2022-07-01",
  "name": "MySecureVault",
  "location": "eastus",
  "properties": {
    "sku": {
      "family": "A",
      "name": "standard"
    },
    "tenantId": "00000000-0000-0000-0000-000000000000",
    "accessPolicies": []
  },
  "resources": [
    # Add key and certificate resources here
  ]
}

Hint

Use child resources with type set to keys and certificates inside the resources array.

3

Add an access policy for the application

Add an access policy inside the accessPolicies array of the Key Vault properties. The policy should allow the application with object ID 11111111-2222-3333-4444-555555555555 to have get permissions on keys and certificates.

Azure

{
  "type": "Microsoft.KeyVault/vaults",
  "apiVersion": "2022-07-01",
  "name": "MySecureVault",
  "location": "eastus",
  "properties": {
    "sku": {
      "family": "A",
      "name": "standard"
    },
    "tenantId": "00000000-0000-0000-0000-000000000000",
    "accessPolicies": [
      # Add access policy here
    ]
  },
  "resources": [
    {
      "type": "keys",
      "apiVersion": "2022-07-01",
      "name": "MyEncryptionKey",
      "properties": {
        "kty": "RSA"
      }
    },
    {
      "type": "certificates",
      "apiVersion": "2022-07-01",
      "name": "MySSLCertificate",
      "properties": {
        "issuerParameters": {
          "name": "Self"
        },
        "x509CertificateProperties": {
          "subject": "CN=MySSLCertificate"
        }
      }
    }
  ]
}

Hint

Access policies go inside the properties.accessPolicies array. Use the exact objectId and set permissions for keys and certificates to get.

4

Complete the ARM template with all parts combined

Combine all previous parts into one ARM template JSON object that creates the Key Vault MySecureVault with the key MyEncryptionKey, the certificate MySSLCertificate, and the access policy for the application with object ID 11111111-2222-3333-4444-555555555555.

Azure

{
  # Paste the full ARM template JSON here
  # Your code here
}

Hint

Make sure all parts from previous steps are combined correctly in one JSON ARM template object.

Practice

1. What is the main purpose of storing keys and certificates in Azure Key Vault?

easy

A. To monitor network traffic in Azure

B. To increase the speed of Azure virtual machines

C. To create backups of Azure databases automatically

D. To securely store and manage sensitive information like keys and certificates

Solution

1. Step 1: Understand the role of Azure Key Vault

   Azure Key Vault is designed to keep sensitive data like keys and certificates safe and controlled.

2. Step 2: Identify the correct purpose

   The options describing VM speed, database backups, and network monitoring relate to other Azure services or functions.

3. Final Answer:

   To securely store and manage sensitive information like keys and certificates -> Option D

4. Quick Check:

   Key Vault = Secure storage [OK]

Hint: Key Vault is for secrets, not speed or backups [OK]

Common Mistakes:

• Confusing Key Vault with backup services
• Thinking Key Vault speeds up VMs
• Assuming Key Vault monitors network

2. Which Azure CLI command correctly creates a new Key Vault named MyVault in the resource group MyGroup located in eastus?

easy

A. az keyvault new --vault-name MyVault --group MyGroup --region eastus

B. az vault create --name MyVault --resource-group MyGroup --location eastus

C. az keyvault create --name MyVault --resource-group MyGroup --location eastus

D. az keyvault create --vault MyVault --resource-group MyGroup --location eastus

Solution

1. Step 1: Recall correct Azure CLI syntax for Key Vault creation

   The correct command uses az keyvault create with parameters --name, --resource-group, and --location.

2. Step 2: Compare options

   az keyvault create --name MyVault --resource-group MyGroup --location eastus matches the correct syntax exactly. The other options use incorrect commands like az keyvault new or az vault create, or wrong parameter names like --vault-name, --group, or --vault.

3. Final Answer:

   az keyvault create --name MyVault --resource-group MyGroup --location eastus -> Option C

4. Quick Check:

   Correct CLI syntax = az keyvault create --name MyVault --resource-group MyGroup --location eastus [OK]

Hint: Use 'az keyvault create' with --name, --resource-group, --location [OK]

Common Mistakes:

• Using 'az keyvault new' instead of 'create'
• Wrong parameter names like --vault or --group
• Confusing 'vault' and 'keyvault' commands

3. Given this Azure CLI command sequence:
az keyvault secret set --vault-name MyVault --name ApiKey --value "12345"
What will be the result when you run az keyvault secret show --vault-name MyVault --name ApiKey?

medium

A. It will display the secret value "12345" along with metadata

B. It will return an error because secrets cannot be retrieved

C. It will show an empty secret value

D. It will delete the secret named ApiKey

Solution

1. Step 1: Understand secret creation and retrieval

   The first command stores a secret named ApiKey with value "12345" in MyVault. The second command retrieves that secret.

2. Step 2: Predict the output of secret show command

   The show command returns the secret's value and metadata. It does not delete or error unless permissions are missing.

3. Final Answer:

   It will display the secret value "12345" along with metadata -> Option A

4. Quick Check:

   Secret show returns stored value [OK]

Hint: Secret show command retrieves stored secret value [OK]

Common Mistakes:

• Thinking secrets cannot be retrieved
• Expecting deletion on show command
• Assuming empty value if not specified

4. You run this command to create a certificate in Azure Key Vault:
az keyvault certificate create --vault-name MyVault --name MyCert --policy @policy.json
But you get an error saying the policy file is invalid. What is the most likely cause?

medium

A. The JSON file policy.json has syntax errors or incorrect structure

B. The vault name MyVault does not exist

C. The certificate name MyCert is already in use

D. The Azure CLI is not installed

Solution

1. Step 1: Analyze the error message about invalid policy file

   The error points to the policy file being invalid, which usually means JSON syntax or structure issues.

2. Step 2: Consider other options

   While vault existence or name conflicts cause errors, the message specifically mentions the policy file. CLI installation issues would prevent any command from running.

3. Final Answer:

   The JSON file policy.json has syntax errors or incorrect structure -> Option A

4. Quick Check:

   Invalid policy file = JSON syntax error [OK]

Hint: Check JSON file syntax if policy error occurs [OK]

Common Mistakes:

• Ignoring JSON syntax errors
• Assuming vault or name issues without checking file
• Not validating JSON before use

5. You want to automate deployment of an Azure Key Vault with a certificate and restrict access so only a specific app can use the certificate. Which combination of steps is best practice?

hard

A. Create Key Vault; disable all access policies; share certificate via email

B. Create Key Vault with access policies granting the app permission; upload certificate; avoid storing secrets in code

C. Create Key Vault; upload certificate; embed certificate value directly in app code

D. Create Key Vault; store certificate value as a secret; give all users access to the vault

Solution

1. Step 1: Securely create Key Vault and upload certificate

   Create the vault and add the certificate properly to keep it safe and managed.

2. Step 2: Set access policies to restrict usage to the specific app and avoid secrets in code

   Grant only the app needed permissions and never put secrets or certificates directly in code to prevent leaks.

3. Final Answer:

   Create Key Vault with access policies granting the app permission; upload certificate; avoid storing secrets in code -> Option B

4. Quick Check:

   Restrict access + no secrets in code = Create Key Vault with access policies granting the app permission; upload certificate; avoid storing secrets in code [OK]

Hint: Use access policies and never embed secrets in code [OK]

Common Mistakes:

• Giving broad access to all users
• Embedding secrets directly in application code
• Disabling access policies and sharing insecurely