Syntax Properties Return values Examples

AWS::Events::EventBusPolicy

Running PutPermission permits the specified Amazon account or Amazon organization to put events to the specified event bus. Amazon EventBridge (CloudWatch Events) rules in your account are triggered by these events arriving to an event bus in your account.

For another account to send events to your account, that external account must have an EventBridge rule with your account's event bus as a target.

To enable multiple Amazon accounts to put events to your event bus, run PutPermission once for each of these accounts. Or, if all the accounts are members of the same Amazon organization, you can run PutPermission once specifying Principal as "*" and specifying the Amazon organization ID in Condition, to grant permissions to all accounts in that organization.

If you grant permissions using an organization, then accounts in that organization must specify a RoleArn with proper permissions when they use PutTarget to add your account's event bus as a target. For more information, see Sending and Receiving Events Between Amazon Accounts in the Amazon EventBridge User Guide.

The permission policy on the event bus cannot exceed 10 KB in size.

Syntax

To declare this entity in your Amazon CloudFormation template, use the following syntax:

JSON


{
  "Type" : "AWS::Events::EventBusPolicy",
  "Properties" : {
      "Action" : String,
      "Condition" : Condition,
      "EventBusName" : String,
      "Principal" : String,
      "Statement" : Json,
      "StatementId" : String
    }
}

YAML


Type: AWS::Events::EventBusPolicy
Properties: 
  Action: String
  Condition: 
    Condition
  EventBusName: String
  Principal: String
  Statement: Json
  StatementId: String

Properties

Action

The action that you are enabling the other account to perform.

Required: No

Type: String

Minimum: 1

Maximum: 64

Pattern: events:[a-zA-Z]+

Update requires: No interruption

Condition

This parameter enables you to limit the permission to accounts that fulfill a certain condition, such as being a member of a certain Amazon organization. For more information about Amazon Organizations, see What Is Amazon Organizations in the Amazon Organizations User Guide.

If you specify Condition with an Amazon organization ID, and specify "*" as the value for Principal, you grant permission to all the accounts in the named organization.

The Condition is a JSON string which must contain Type, Key, and Value fields.

Required: No

Type: Condition

Update requires: No interruption

EventBusName

The name of the event bus associated with the rule. If you omit this, the default event bus is used.

Required: No

Type: String

Minimum: 1

Maximum: 256

Pattern: [\.\-_A-Za-z0-9]+

Update requires: Replacement

Principal

The 12-digit Amazon account ID that you are permitting to put events to your default event bus. Specify "*" to permit any account to put events to your default event bus.

If you specify "*" without specifying Condition, avoid creating rules that may match undesirable events. To create more secure rules, make sure that the event pattern for each rule contains an account field with a specific account ID from which to receive events. Rules with an account field do not match any events sent from other accounts.

Required: No

Type: String

Minimum: 1

Maximum: 12

Pattern: (\d{12}|\*)

Update requires: No interruption

Statement

A JSON string that describes the permission policy statement. You can include a Policy parameter in the request instead of using the StatementId, Action, Principal, or Condition parameters.

Required: No

Type: Json

Update requires: No interruption

StatementId

An identifier string for the external account that you are granting permissions to. If you later want to revoke the permission for this external account, specify this StatementId when you run RemovePermission.

Note

Each StatementId must be unique.

Required: Yes

Type: String

Minimum: 1

Maximum: 64

Pattern: [a-zA-Z0-9-_]+

Update requires: Replacement

Return values

Ref

When you pass the logical ID of this resource to the intrinsic Reffunction, Refreturns the event bus policy ID, such as EventBusPolicy-1aBCdeFGh2J3.

For more information about using the Reffunction, see Ref.

Examples

Grant Permission to One Account

The following example grants permission to one Amazon account with an account ID of 111122223333.

JSON


"SampleEventBusPolicy": {
    "Type": "AWS::Events::EventBusPolicy",
    "Properties": {
        "StatementId": "MyStatement",
        "Statement": {
            "Effect": "Allow",
            "Principal" : {"AWS" : "arn:aws:iam::111122223333:root"},
            "Action": "events:PutEvents",
            "Resource": "arn:aws:events:us-east-1:111122223333:event-bus/default"
        }
    }
}

YAML


SampleEventBusPolicy: 
    Type: AWS::Events::EventBusPolicy
    Properties: 
        StatementId: "MyStatement"
        Statement: 
            Effect: "Allow"
            Principal: 
                AWS: "arn:aws:iam::111122223333:root"
            Action: "events:PutEvents"
            Resource: "arn:aws:events:us-east-1:111122223333:event-bus/default"

Grant Permission to an Organization

The following example grants permission to all Amazon accounts in the organization with an organization ID of o-1234567890.

JSON


"SampleEventBusPolicy": {
    "Type": "AWS::Events::EventBusPolicy",
    "Properties": {
        "StatementId": "MyStatement",
        "Statement": {
            "Effect": "Allow",
            "Principal" : "*",
            "Action": "events:PutEvents",
            "Resource": "arn:aws:events:us-east-1:111122223333:event-bus/default",
            "Condition": {
                "StringEquals": {"aws:PrincipalOrgID": "o-1234567890"}
             }
        }
    }
}

YAML


SampleEventBusPolicy: 
    Type: AWS::Events::EventBusPolicy
    Properties: 
        StatementId: "MyStatement"
        Statement: 
            Effect: "Allow"
            Principal: "*"
            Action: "events:PutEvents"
            Resource: "arn:aws:events:us-east-1:111122223333:event-bus/default"
            Condition:
                StringEquals:
                    "aws:PrincipalOrgID": "o-1234567890"

Deny policy using multiple principals and actions

The following example demonstrates a deny policy statement using multiple principals and actions.

JSON


"SampleDenyEventBusPolicy": {
    "Type": "AWS::Events::EventBusPolicy",
    "Properties": {
        "StatementId": "MyDenyStatement",
        "Statement": {
            "Effect": "Deny",
            "Principal" : 
                {"AWS" : ["arn:aws:iam::111122223333:user/alice", "arn:aws:iam::111122223333:user/bob"]},
            "Action": [
                "events:PutEvents",
                "events:PutRule"
            ],
            "Resource": "arn:aws:events:us-east-1:111122223333:event-bus/default"
        }
    }
}

YAML


SampleDenyEventBusPolicy: 
    Type: AWS::Events::EventBusPolicy
    Properties: 
        StatementId: "MyDenyStatement"
        Statement: 
            Effect: "Deny"
            Principal: 
                AWS: 
                    - "arn:aws:iam::111122223333:user/alice"
                    - "arn:aws:iam::111122223333:user/bob"
            Action: 
                - "events:PutEvents"
                - "events:PutRule"
            Resource: "arn:aws:events:us-east-1:111122223333:event-bus/default"

Grant Permission to an Organization using a custom event bus

The following example grants permission to all Amazon accounts in the organization with an organization ID of o-1234567890 using a custom event bus.

JSON


"SampleCustomEventBus": {
    "Type": "AWS::Events::EventBus",
    "Properties": {
        "Name": "MyCustomEventBus"
     }
},
"SampleCustomEventBusPolicy": {
    "Type": "AWS::Events::EventBusPolicy",
    "Properties": {
        "EventBusName": {
            "Ref": "SampleCustomEventBus"
        },
        "StatementId": "MyCustomEventBusStatement",
        "Statement": {
            "Effect": "Allow",
            "Principal" : "*",
            "Action": "events:PutEvents",
            "Resource": {
                "Fn::GetAtt": [
                    "SampleCustomEventBus",
                    "Arn"
                ]
            },
            "Condition": {
                "StringEquals": {"aws:PrincipalOrgID": "o-1234567890"}
            }
        }
    }
}

YAML


SampleCustomEventBus: 
    Type: AWS::Events::EventBus
    Properties:
        Name: "MyCustomEventBus"

SampleCustomEventBusPolicy: 
    Type: AWS::Events::EventBusPolicy
    Properties: 
        EventBusName:
            Ref: "SampleCustomEventBus"
        StatementId: "MyCustomEventBusStatement"
        Statement:
            Effect: "Allow"
            Principal: "*"
            Action: "events:PutEvents"
            Resource: !GetAtt "SampleCustomEventBus.Arn"
            Condition:
                StringEquals:
                    "aws:PrincipalOrgID": "o-1234567890"

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