Adding policies to an existing parameter

Assigning parameter policies in Parameter Store

Parameter policies help you manage a growing set of parameters by allowing you to assign specific criteria to a parameter such as an expiration date or time to live. Parameter policies are especially helpful in forcing you to update or delete passwords and configuration data stored in Parameter Store, a capability of Amazon Systems Manager. Parameter Store offers the following types of policies: Expiration, ExpirationNotification, and NoChangeNotification.

Note

To implement password rotation lifecycles, use Amazon Secrets Manager. You can rotate, manage, and retrieve database credentials, API keys, and other secrets throughout their lifecycle using Secrets Manager. For more information, see What is Amazon Secrets Manager? in the Amazon Secrets Manager User Guide.

Parameter Store enforces parameter policies by using asynchronous, periodic scans. After you create a policy, you don't need to perform additional actions to enforce the policy. Parameter Store independently performs the action defined by the policy according to the criteria you specified.

Note

Parameter policies are available for parameters that use the advanced parameters tier. For more information, see Managing parameter tiers.

A parameter policy is a JSON array, as shown in the following table. You can assign a policy when you create a new advanced parameter, or you can apply a policy by updating a parameter. Parameter Store supports the following types of parameter policies.

Policy Details Examples

Policy	Details	Examples
Expiration	This policy deletes the parameter. You can specify a specific date and time by using either the `ISO_INSTANT` format or the `ISO_OFFSET_DATE_TIME` format. To change when you want the parameter to be deleted, update the policy. Updating a parameter doesn't affect the expiration date or time of the policy attached to it. When the expiration date and time is reached, Parameter Store deletes the parameter. Note This example uses the `ISO_INSTANT` format. You can also specify a date and time by using the `ISO_OFFSET_DATE_TIME` format. Here is an example: `2019-11-01T22:13:48.87+10:30:00` .	`{ "Type": "Expiration", "Version": "1.0", "Attributes": { "Timestamp": "2018-12-02T21:34:33.000Z" } }`
ExpirationNotification	This policy initiates an event in Amazon EventBridge (EventBridge) that notifies you about the expiration. By using this policy, you can receive notifications before the expiration time is reached, in units of days or hours.	`{ "Type": "ExpirationNotification", "Version": "1.0", "Attributes": { "Before": "15", "Unit": "Days" } }`
NoChangeNotification	This policy initiates an event in EventBridge if a parameter has not been modified for a specified period of time. This policy type is useful when, for example, a password needs to be changed within a period of time. This policy determines when to send a notification by reading the `LastModifiedTime` attribute of the parameter. If you change or edit a parameter, the system resets the notification time period based on the new value of `LastModifiedTime`.	`{ "Type": "NoChangeNotification", "Version": "1.0", "Attributes": { "After": "20", "Unit": "Days" } }`

Expiration

This policy deletes the parameter. You can specify a specific date and time by using either the ISO_INSTANT format or the ISO_OFFSET_DATE_TIME format. To change when you want the parameter to be deleted, update the policy. Updating a parameter doesn't affect the expiration date or time of the policy attached to it. When the expiration date and time is reached, Parameter Store deletes the parameter.

Note

This example uses the ISO_INSTANT format. You can also specify a date and time by using the ISO_OFFSET_DATE_TIME format. Here is an example: 2019-11-01T22:13:48.87+10:30:00 .


{
    "Type": "Expiration",
    "Version": "1.0",
    "Attributes": {
        "Timestamp": "2018-12-02T21:34:33.000Z"
    }
}

ExpirationNotification

This policy initiates an event in Amazon EventBridge (EventBridge) that notifies you about the expiration. By using this policy, you can receive notifications before the expiration time is reached, in units of days or hours.


{
    "Type": "ExpirationNotification",
    "Version": "1.0",
    "Attributes": {
        "Before": "15",
        "Unit": "Days"
    }
}

NoChangeNotification

This policy initiates an event in EventBridge if a parameter has not been modified for a specified period of time. This policy type is useful when, for example, a password needs to be changed within a period of time.

This policy determines when to send a notification by reading the LastModifiedTime attribute of the parameter. If you change or edit a parameter, the system resets the notification time period based on the new value of LastModifiedTime.


{
    "Type": "NoChangeNotification",
    "Version": "1.0",
    "Attributes": {
        "After": "20",
        "Unit": "Days"
    }
}

You can assign multiple policies to a parameter. For example, you can assign Expiration and ExpirationNotification policies so that the system initiates an EventBridge event to notify you about the impending deletion of a parameter. You can assign a maximum of ten (10) policies to a parameter.

The following example shows the request syntax for a PutParameter API request that assigns four policies to a new SecureString parameter named ProdDB3.


{
    "Name": "ProdDB3",
    "Description": "Parameter with policies",
    "Value": "P@ssW*rd21",
    "Type": "SecureString",
    "Overwrite": "True",
    "Policies": [
        {
            "Type": "Expiration",
            "Version": "1.0",
            "Attributes": {
                "Timestamp": "2018-12-02T21:34:33.000Z"
            }
        },
        {
            "Type": "ExpirationNotification",
            "Version": "1.0",
            "Attributes": {
                "Before": "30",
                "Unit": "Days"
            }
        },
        {
            "Type": "ExpirationNotification",
            "Version": "1.0",
            "Attributes": {
                "Before": "15",
                "Unit": "Days"
            }
        },
        {
            "Type": "NoChangeNotification",
            "Version": "1.0",
            "Attributes": {
                "After": "20",
                "Unit": "Days"
            }
        }
    ]
}

Adding policies to an existing parameter

This section includes information about how to add policies to an existing parameter by using the Amazon Systems Manager console, the Amazon Command Line Interface (Amazon CLI), and Amazon Tools for Windows PowerShell . For information about how to create a new parameter that includes policies, see Creating Parameter Store parameters in Systems Manager.

Topics

Adding policies to an existing parameter using the console
Adding policies to an existing parameter using the Amazon CLI
Adding policies to an existing parameter (Tools for Windows PowerShell)

Adding policies to an existing parameter using the console

Use the following procedure to add policies to an existing parameter by using the Systems Manager console.

To add policies to an existing parameter

Open the Amazon Systems Manager console at https://console.amazonaws.cn/systems-manager/.
In the navigation pane, choose Parameter Store.
Choose the option next to the parameter that you want to update to include policies, and then choose Edit.
Choose Advanced.
(Optional) In the Parameter policies section, choose Enabled. You can specify an expiration date and one or more notification policies for this parameter.
Choose Save changes.

Important

Parameter Store preserves policies on a parameter until you either overwrite the policies with new policies or remove the policies.
To remove all policies from an existing parameter, edit the parameter and apply an empty policy by using brackets and curly braces, as follows: [{}]
If you add a new policy to a parameter that already has policies, then Systems Manager overwrites the policies attached to the parameter. The existing policies are deleted. If you want to add a new policy to a parameter that already has one or more policies, copy and paste the original policies, type the new policy, and then save your changes.

Adding policies to an existing parameter using the Amazon CLI

Use the following procedure to add policies to an existing parameter by using the Amazon CLI.

To add policies to an existing parameter

Install and configure the Amazon Command Line Interface (Amazon CLI), if you haven't already.

For information, see Installing or updating the latest version of the Amazon CLI.

Run the following command to add policies to an existing parameter. Replace each example resource placeholder with your own information.

Here is an example that includes an expiration policy that deletes the parameter after 15 days. The example also includes a notification policy that generates an EventBridge event five (5) days before the parameter is deleted. Last, it includes a NoChangeNotification policy if no changes are made to this parameter after 60 days. The example uses an obfuscated name (3l3vat3131) for a password and an Amazon Key Management Service Amazon KMS key. For more information about Amazon KMS keys, see Amazon Key Management Service Concepts in the Amazon Key Management Service Developer Guide.

Run the following command to verify the details of the parameter. Replace parameter name with your own information.
Linux & macOS
```
aws ssm describe-parameters  \
    --parameter-filters "Key=Name,Values=parameter name"
```
Windows
```
aws ssm describe-parameters  ^
    --parameter-filters "Key=Name,Values=parameter name"
```

Important

Parameter Store retains policies for a parameter until you either overwrite the policies with new policies or remove the policies.
To remove all policies from an existing parameter, edit the parameter and apply an empty policy of brackets and curly braces. Replace each example resource placeholder with your own information. For example:
Linux & macOS
```
aws ssm put-parameter \
    --name parameter name \
    --type parameter type  \
    --value 'parameter value' \
    --policies "[{}]"
```
Windows
```
aws ssm put-parameter ^
    --name parameter name ^
    --type parameter type  ^
    --value 'parameter value' ^
    --policies "[{}]"
```
If you add a new policy to a parameter that already has policies, then Systems Manager overwrites the policies attached to the parameter. The existing policies are deleted. If you want to add a new policy to a parameter that already has one or more policies, copy and paste the original policies, type the new policy, and then save your changes.

Adding policies to an existing parameter (Tools for Windows PowerShell)

Use the following procedure to add policies to an existing parameter by using Tools for Windows PowerShell. Replace each example resource placeholder with your own information.

To add policies to an existing parameter

Open Tools for Windows PowerShell and run the following command to specify your credentials. You must either have administrator permissions in Amazon Elastic Compute Cloud (Amazon EC2), or you must have been granted the appropriate permission in Amazon Identity and Access Management (IAM).
```
Set-AWSCredentials `
    –AccessKey access-key-name `
    –SecretKey secret-key-name
```
Run the following command to set the Region for your PowerShell session. The example uses the US East (Ohio) Region (us-east-2).
```
Set-DefaultAWSRegion `
    -Region us-east-2
```
Run the following command to add policies to an existing parameter. Replace each example resource placeholder with your own information.
```
Write-SSMParameter `
    -Name "parameter name" `
    -Value "parameter value" `
    -Type "parameter type" `
    -Policies "[{policies-enclosed-in-brackets-and-curly-braces}]" `
    -Overwrite
```
Here is an example that includes an expiration policy that deletes the parameter at midnight (GMT) on May 13, 2020. The example also includes a notification policy that generates an EventBridge event five (5) days before the parameter is deleted. Last, it includes a NoChangeNotification policy if no changes are made to this parameter after 60 days. The example uses an obfuscated name (3l3vat3131) for a password and an Amazon managed key.
```
Write-SSMParameter `
    -Name "/Finance/Payroll/3l3vat3131" `
    -Value "P@sSwW)rd" `
    -Type "SecureString" `
    -Policies "[{\"Type\":\"Expiration\",\"Version\":\"1.0\",\"Attributes\":{\"Timestamp\":\"2018-05-13T00:00:00.000Z\"}},{\"Type\":\"ExpirationNotification\",\"Version\":\"1.0\",\"Attributes\":{\"Before\":\"5\",\"Unit\":\"Days\"}},{\"Type\":\"NoChangeNotification\",\"Version\":\"1.0\",\"Attributes\":{\"After\":\"60\",\"Unit\":\"Days\"}}]" `
    -Overwrite
```
Run the following command to verify the details of the parameter. Replace parameter name with your own information.
```
(Get-SSMParameterValue -Name "parameter name").Parameters
```

Important

Parameter Store preserves policies on a parameter until you either overwrite the policies with new policies or remove the policies.
To remove all policies from an existing parameter, edit the parameter and apply an empty policy of brackets and curly braces. For example:
```
Write-SSMParameter `
    -Name "parameter name" `
    -Value "parameter value" `
    -Type "parameter type" `
    -Policies "[{}]"
```
If you add a new policy to a parameter that already has policies, then Systems Manager overwrites the policies attached to the parameter. The existing policies are deleted. If you want to add a new policy to a parameter that already has one or more policies, copy and paste the original policies, type the new policy, and then save your changes.

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