157 lines
4.9 KiB
Markdown
157 lines
4.9 KiB
Markdown
# AWS Host Plugin for HashiCorp Boundary
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This repo contains a Host-type plugin for [HashiCorp
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Boundary](https://www.boundaryproject.io/) allowing dynamically sourcing hosts
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from Amazon EC2.
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Host sets created with this plugin define filters which select and group like
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instances within AWS; these host sets can in turn be added to targets within
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Boundary as host sources.
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At creation or update of a host catalog of this type, configuration of the
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plugin is performed via the attribute/secret values passed to the create or
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update calls actions. These values are input as JSON objects; the expected types
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are indicated below with the valid fields.
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The plugin fetches hosts through the
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[DescribeInstances](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeInstances.html)
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call.
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## Credential Rotation
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Although credentials are stored encrypted within Boundary, by default this
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plugin will attempt to rotate credentials when they are supplied through the
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`secrets` object on a create or update call to the host catalog resource. The
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given credentials will be used to create a new credential, and then the given
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credential will be revoked. In this way, after rotation, only Boundary knows the
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client secret in use by this plugin.
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## Getting Started
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Refer to [Attributes and Secrets](#attributes-and-secrets) for more detail on
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configuration options for host catalogs and sets.
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To create a host catalog (using default scope created by `boundary dev`):
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```
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boundary host-catalogs create plugin \
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-scope-id p_1234567890 \
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-name "Example Plugin-Based Host Catalog" \
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-description "Description for plugin-based host catalog" \
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-plugin-name aws \
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-attr region=REGION \
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-secret access_key_id='KEY' \
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-secret secret_access_key='SECRET'
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```
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To create a host set, filtering the host set based on tag keys `foo` or `bar`
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(either tag can be present), ensuring that any targets set to this host set only
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connect to external addresses in the `54.0.0.0/8` class A subnet:
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```
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boundary host-sets create plugin \
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-host-catalog-id HOST_CATALOG_ID \
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-name "Example Plugin-Based Host Set" \
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-description "Description for plugin-based host set" \
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-attr filters=tag-key=foo,bar \
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-preferred-endpoint "cidr:54.0.0.0/8"
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```
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As above, but instances must have both tags (both `foo` and `bar` *must* be
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present):
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```
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boundary host-sets create plugin \
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-host-catalog-id HOST_CATALOG_ID \
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-name "Example Plugin-Based Host Set" \
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-description "Description for plugin-based host set" \
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-attr filters=tag-key=foo \
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-attr filters=tag-key=bar \
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-preferred-endpoint "cidr:54.0.0.0/8"
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```
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As above, but matching on tag key named "development" with value "prod" or "dev"
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and launch date:
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```
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boundary host-sets create plugin \
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-host-catalog-id HOST_CATALOG_ID \
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-name "Example Plugin-Based Host Set" \
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-description "Description for plugin-based host set" \
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-attr filters=tag:development=prod,dev \
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-attr filters=launch-time=2022-01-04T* \
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-preferred-endpoint "cidr:54.0.0.0/8"
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```
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## Required IAM Privileges
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The following IAM privileges, at the very least, are required to be attached to
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a configured IAM user for this provider:
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* `ec2:DescribeInstances`, configured to `*` (`DescribeInstances` cannot be
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scoped to a resource ARN). Example policy:
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```
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{
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"Version": "2012-10-17",
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"Statement": [
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{
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"Action": [
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"ec2:DescribeInstances"
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],
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"Effect": "Allow",
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"Resource": "*"
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}
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]
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}
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```
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* `iam:GetUser`, `iam:CreateAccessKey`, and `iam:DeleteAccessKey`, configured to
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the IAM user to allow credential rotation. Example policy:
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```
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{
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"Version": "2012-10-17",
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"Statement": [
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{
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"Action": [
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"iam:DeleteAccessKey",
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"iam:GetUser",
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"iam:CreateAccessKey"
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],
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"Effect": "Allow",
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"Resource": "arn:aws:iam::123456789012:user/JohnDoe"
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}
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]
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}
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```
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## Attributes and Secrets
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### Host Catalog
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The following `attributes` are valid on an AWS host catalog resource:
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- `disable_credential_rotation` (bool): If `true`, credential rotation will not
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be performed. See the [Credential Rotation](#credential-rotation) section
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above.
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- `region` (string): The region to configure the host catalog for. All host sets
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in this catalog will be configured for this region.
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The following `secrets` are valid on an AWS host catalog resource:
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- `access_key_id` (string): The access key ID for the IAM user to use with this
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host catalog.
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- `secret_access_key` (string): The secret access key for the IAM user to use
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with this host catalog.
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### Host Set
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The following attributes are valid on an AWS host Set resource:
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- `filters` (array of strings): An array of string filters in the format
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`key=val1,val2`. The key corresponds to a filter option, and the value(s) are
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a comma-separated list. For a list of filter options, check out
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[describe-instances in the AWS CLI
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reference](https://docs.aws.amazon.com/cli/latest/reference/ec2/describe-instances.html).
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