inspec/README.md

# InSpec Azure Resource Pack

This resource pack provides resources for Azure Resources.  It will ship with the required resources to write your own compliance rules:

```
├── README.md - this readme
├── controls - contains example controls
└── libraries - contains Azure resources
```

## Get Started

This profile uses the Azure Ruby SDK and as such requires a Service Principal Name (SPN) to be created in the Azure subscription that is being tested.

This can be done on the command line or from the Azure Portal

- Azure CLI: https://docs.microsoft.com/en-us/azure/azure-resource-manager/resource-group-authenticate-service-principal-cli
- PowerShell: https://docs.microsoft.com/en-us/azure/azure-resource-manager/resource-group-authenticate-service-principal
- Azure Portal: https://docs.microsoft.com/en-us/azure/azure-resource-manager/resource-group-create-service-principal-portal

The information from the SPN can be specified either in a file `~/.azure/credentials`, a different file or as environment variables.

### Credentials File

The simplest way is to create the file `~/.azure/credentials` with the following format.  The profile is configured to look for this file by default do no settings are required.

```
[<SUBSCRIPTION_ID>]
client_id = "<CLIENT_ID>"
client_secret = "<CLIENT_SECRET>"
tenant_id = "<TENANT_ID>"
```

So to run the profile now it is as simple as running:

```bash
inspec exec inspec-azure
```

A different credentials file, with the same format, can be specified as an environment variable `AZURE_CREDS_FILE`:

```bash
AZURE_CREDS_FILE="/path/to/another/file" inspec exec inspec-azure
```

Note that this file format supports multiple subscription_ids.  By default `inspec-azure` will pick the first subscription in the file.  However if another subscription should be used then specify it in the environment variable `AZURE_SUBSCRIPTION_ID`.

```bash
AZURE_SUBSCRIPTION_ID="2fbdbb02-df2e-11e6-bf01-fe55135034f3" inspec exec inspec-azure
```

### Environment variables

It is possible to not have a credentials file at all and specify all of the required information as the following environment variables:

- `AZURE_SUBSCRIPTION_ID`
- `AZURE_CLIENT_ID`
- `AZURE_CLIENT_SECRET`
- `AZURE_TENANT_ID`

For example:

```bash
AZURE_SUBSCRIPTION_ID="2fbdbb02-df2e-11e6-bf01-fe55135034f3" \
AZURE_CLIENT_ID="58dc4f6c-df2e-11e6-bf01-fe55135034f3" \
AZURE_CLIENT_SECRET="Jibr4iwwaaZwBb6W" \
AZURE_TENANT_ID="6ad89b58-df2e-11e6-bf01-fe55135034f3" inspec exec inspec-azure
```

## Use the resources

Since this is an InSpec resource pack, it only defines InSpec resources.  It includes example tests only.  To easily use the Azure InSpec resources in your tests do the following:

### Create a new profile

```bash
inspec init profile my-profile
``` 

### Adapt the `inspec.yml`

```yaml
name: my-profile
title: My own Azure profile
version: 0.1.0
depends:
  - name: azure
    url: https://github.com/chef/inspec-azure/archive/master.tar.gz
```

### Add controls

Since your profile depends on the resource pack, you can use those resources in your own profile:

```ruby
control 'azure-1' do
  impact 1.0
  title 'Checks that the machine was built from the correct image'

  describe azurevm_image(host: 'example-01', resource_group: 'MyResourceGroup') do
    its('sku') { should eq '16.04.0-LTS' }
    its('publisher') { should ieq 'Canonical' }
    its('offer') { should ieq 'UbuntuServer' }
  end
end
```

### Available Resources

- `azure_vm` - This resource reads information about a virtual machine in the specified resource group

| Resource Name | Resources | Description |
|---------------|-----------|-------------|
| azure_vm | publisher | Publisher that provided the image in the marketplace |
| | offer | The offer of the image |
| | sku | The SKU being used |

- `azure_vm_datadisks` - Resource to read the data disks for a machine and check that they are of the correct size etc

| Resource Name | Resources | Description |
|---------------|-----------|-------------|
| azure_vm_datadisks | has_disks? | Boolean test to see if a machine has datadisks |
| | count | Returns the number of data disks attached to the machine |
| | where | Filter that allows for different tests to be performed, see examples below |

When data disks are retrieved from a machine they are given as an array.  The `where` filter will interogate the array according the criteria it is given.  The followin attributes are available in the filter:

 - `disk` - Disk number (0 index based)
 - `caching` - What sort of caching is enabled on the data disk
 - `create_option` - How the disk was created
 - `size` - The size of the disk in GB
 - `lun` - The LUN number
 - `name` - Name of the disk
 - `uri` - Full URI to the disk in Blob storage
 - `storage_account` - The name of the storage account in which the Blob storage exists

**Note:  This does not yet work with Managed Disks**

## Examples

### Test for 1 disk with a size greater than 10gb

```ruby
control 'azure-1' do
  impact 1.0
  title 'Checks that the machine has exactly one data disk and it is over 10gb in size'

  describe azurevm_image(host: 'example-01', resource_group: 'MyResourceGroup') do
    its('has_disks?') { should be true }
    its('count') { should eq 1 }
  end

  describe azurevm_image(host: 'example-01', resource_group: 'MyResourceGroup').where { disk == 0 and size > 10 } do
    its('entries') { should_not be_empty }
  end
end
```

### Using the example controls

There a number of example controls that have been added to this resource.  They are driven by environment variables to make them easier to run.  For example the following would test a machine called `example-01` in the resource group `exmaple-rg`.

```bash
$> AZURE_VM_NAME='example-01' AZURE_RESOURCE_GROUP_NAME='example-rg' bundle exec inspec exec .
```

## License

|  |  |
| ------ | --- |
| **Author:** | Russell Seymour (<russell@chef.io>) |
| **Copyright:** | Copyright (c) 2017 Chef Software Inc. |
| **License:** | Apache License, Version 2.0 |

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.