Amazon Step Functions - Amazon Step Functions
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Amazon Step Functions

For a state machine that calls StartExecution for a single nested workflow execution, use an IAM policy that limits permissions to that state machine. 

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "states:StartExecution"
            ],
            "Resource": [
                "arn:aws-cn:states:[[region]]:[[accountId]]:stateMachine:[[stateMachineName]]"
            ]
        }
    ]
}

For more information, see the following:

Synchronous
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "states:StartExecution"
            ],
            "Resource": [
                "arn:aws-cn:states:[[region]]:[[accountId]]:stateMachine:[[stateMachineName]]"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "states:DescribeExecution",
                "states:StopExecution"
            ],
            "Resource": [
               "arn:aws-cn:states:[[region]]:[[accountId]]:execution:[[stateMachineName]]:*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "events:PutTargets",
                "events:PutRule",
                "events:DescribeRule"
            ],
            "Resource": [
               "arn:aws-cn:events:[[region]]:[[accountId]]:rule/StepFunctionsGetEventsForStepFunctionsExecutionRule"
            ]
        }
    ]
}
Asynchronous
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "states:StartExecution"
            ],
            "Resource": [
                "arn:aws-cn:states:[[region]]:[[accountId]]:stateMachine:[[stateMachineName]]"
            ]
        }
    ]
}

For more information about nested workflow executions, see Start Workflow Executions from a Task State.