119 lines
4.4 KiB
Plaintext
119 lines
4.4 KiB
Plaintext
---
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layout: docs
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page_title: AWS KMS - Seals - Configuration
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sidebar_title: AWS KMS
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description: |-
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The AWS KMS seal configures Vault to use AWS KMS as the seal wrapping
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mechanism.
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---
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# `awskms` Seal
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The AWS KMS seal configures Vault to use AWS KMS as the seal wrapping mechanism.
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The AWS KMS seal is activated by one of the following:
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- The presence of a `seal "awskms"` block in Vault's configuration file
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- The presence of the environment variable `VAULT_SEAL_TYPE` set to `awskms`. If
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enabling via environment variable, all other required values specific to AWS
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KMS (i.e. `VAULT_AWSKMS_SEAL_KEY_ID`) must be also supplied, as well as all
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other AWS-related environment variables that lends to successful
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authentication (i.e. `AWS_ACCESS_KEY_ID`, etc.).
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## `awskms` Example
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This example shows configuring AWS KMS seal through the Vault configuration file
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by providing all the required values:
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```hcl
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seal "awskms" {
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region = "us-east-1"
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access_key = "AKIAIOSFODNN7EXAMPLE"
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secret_key = "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY"
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kms_key_id = "19ec80b0-dfdd-4d97-8164-c6examplekey"
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endpoint = "https://vpce-0e1bb1852241f8cc6-pzi0do8n.kms.us-east-1.vpce.amazonaws.com"
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}
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```
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## `awskms` Parameters
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These parameters apply to the `seal` stanza in the Vault configuration file:
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- `region` `(string: "us-east-1")`: The AWS region where the encryption key
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lives. If not provided, may be populated from the `AWS_REGION` or
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`AWS_DEFAULT_REGION` environment variables, from your `~/.aws/config` file,
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or from instance metadata.
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- `access_key` `(string: <required>)`: The AWS access key ID to use. May also be
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specified by the `AWS_ACCESS_KEY_ID` environment variable or as part of the
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AWS profile from the AWS CLI or instance profile.
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- `session_token` `(string: "")`: Specifies the AWS session token. This can
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also be provided via the environment variable `AWS_SESSION_TOKEN`.
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- `secret_key` `(string: <required>)`: The AWS secret access key to use. May
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also be specified by the `AWS_SECRET_ACCESS_KEY` environment variable or as
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part of the AWS profile from the AWS CLI or instance profile.
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- `kms_key_id` `(string: <required>)`: The AWS KMS key ID to use for encryption
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and decryption. May also be specified by the `VAULT_AWSKMS_SEAL_KEY_ID`
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environment variable.
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- `endpoint` `(string: "")`: The KMS API endpoint to be used to make AWS KMS
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requests. May also be specified by the `AWS_KMS_ENDPOINT` environment
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variable. This is useful, for example, when connecting to KMS over a [VPC
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Endpoint](https://docs.aws.amazon.com/kms/latest/developerguide/kms-vpc-endpoint.html).
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If not set, Vault will use the default API endpoint for your region.
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## Authentication
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Authentication-related values must be provided, either as environment
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variables or as configuration parameters.
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~> **Note:** Although the configuration file allows you to pass in
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`AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` as part of the seal's parameters, it
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is _strongly_ recommended to set these values via environment variables.
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AWS authentication values:
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- `AWS_REGION` or `AWS_DEFAULT_REGION`
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- `AWS_ACCESS_KEY_ID`
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- `AWS_SECRET_ACCESS_KEY`
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Note: The client uses the official AWS SDK and will use the specified
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credentials, environment credentials, shared file credentials, or IAM role/ECS
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task credentials in that order, if the above AWS specific values are not
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provided.
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Vault needs the following permissions on the KMS key:
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- `kms:Encrypt`
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- `kms:Decrypt`
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- `kms:DescribeKey`
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These can be granted via IAM permissions on the principal that Vault uses, on
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the KMS key policy for the KMS key, or via KMS Grants on the key.
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## `awskms` Environment Variables
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Alternatively, the AWS KMS seal can be activated by providing the following
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environment variables.
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Vault Seal specific values:
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- `VAULT_SEAL_TYPE`
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- `VAULT_AWSKMS_SEAL_KEY_ID`
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## Key Rotation
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This seal supports rotating the master keys defined in AWS KMS
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[doc](https://docs.aws.amazon.com/kms/latest/developerguide/rotate-keys.html). Both automatic
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rotation and manual rotation is supported for KMS since the key information is stored with the
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encrypted data. Old keys must not be disabled or deleted and are used to decrypt older data.
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Any new or updated data will be encrypted with the current key defined in the seal configuration
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or set to current under a key alias.
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## Learn
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Refer to the [Auto-unseal using AWS KMS](https://learn.hashicorp.com/vault/operations/ops-autounseal-aws-kms)
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guide for a step-by-step tutorial.
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