我有两个AWS账户-假设A和B.

在帐户B中，我定义了一个角色，该角色允许从帐户A中访问另一个角​​色。我们称其为角色B

{
  "Version": "2012-10-17",
  "Statement": [
  {
     "Effect": "Allow",
     "Principal": {
         "AWS": "arn:aws:iam::********:role/RoleA"
     },
    "Action": "sts:AssumeRole"
  }]
}

在帐户A中，我定义了一个角色，该角色允许root用户承担角色。让我们称之为角色A

{
  "Version": "2012-10-17",
  "Statement": [
  {
     "Effect": "Allow",
     "Principal": {
         "AWS": "arn:aws:iam::********:root"
     },
    "Action": "sts:AssumeRole"
  }]
}

角色A附加了以下策略

 {
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": "sts:AssumeRole",
            "Resource": "arn:aws:iam::****:role/RoleB",
            "Effect": "Allow"
       }]
 }

作为帐户A的用户，我担任角色A。现在使用此临时凭据，我想承担角色B并访问帐户B拥有的资源。我有以下代码

client = boto3.client('sts')

firewall_role_object = client.assume_role(
    RoleArn=INTERMEDIARY_IAM_ROLE_ARN,
    RoleSessionName=str("default"),
    DurationSeconds=3600)

firewall_credentials = firewall_role_object['Credentials']

firewall_client = boto3.client(
    'sts',
    aws_access_key_id=firewall_credentials['AccessKeyId'],
    aws_secret_access_key=firewall_credentials['SecretAccessKey'],
    aws_session_token=firewall_credentials['SessionToken'], )

optimizely_role_object = firewall_client.assume_role(
    RoleArn=CUSTOMER_IAM_ROLE_ARN,
    RoleSessionName=str("default"),
    DurationSeconds=3600)

print(optimizely_role_object['Credentials'])

该代码适用于我从客户端获得的一组角色，但不适用于我在我有权访问的两个AWS账户之间定义的角色。