Set up an Identity Access Manager account for a ServiceNow user in AWS

Create an AWS CloudFormation Identity Access Manager (IAM) user in the management account using the CloudFormation template (CFT) so you can manage multiple AWS accounts with a centralized IAM user.

Avant de commencer

• Role required: AWS admin

• The ServiceNow IAM user account requires specific AWS IAM permissions to perform basic operations. To learn more about the permissions, see About Amazon Web Services API permissions.

Procédure

1. Log in to the AWS Management console and enter CloudFormation in the search bar and then select it.
2. On the CloudFormation console, select Create Stack.

   A stack is a collection of AWS resources that you can manage as a single unit.

3. Copy the CloudFormation template (CFT) code into a file and save the file.

   The file extension should be .yml. For example, CreateServiceNowUser.yml.

   AWSTemplateFormatVersion: '2010-09-09'
   Description: This script is executed in Management Account where the  ServiceNow user is created.
   
   Metadata:
     AWS::CloudFormation::Interface:
       ParameterGroups:
         - Label:
             default: User Credentials
           Parameters:
             - SNUserName
       ParameterLabels:
         SNUserName:
           default: User Name
   
   Parameters:
     SNUserName:
       Type: String
       Description: User name for CW Service Account user
       MinLength: '6'
       MaxLength: '15'
       ConstraintDescription: The username must be between 6 and 15 characters
   
   Resources:
     SnowCWMemberAccountAccessGroup:
       Type: 'AWS::IAM::Group'
       Properties:
         GroupName: SnowCWMemberAccountAccessGroup
   
     SnowCWAccountAccessPolicy:
       Type: 'AWS::IAM::Policy'
       Properties:
         PolicyName: SnowCWAccountAccessPolicy
         PolicyDocument:
           Statement:
             - Sid: ServiceNowCWUserAccess
               Effect: Allow
               Action:
                 - 'organizations:ListRoots'
                 - 'organizations:ListTagsForResource'
                 - 'organizations:DescribeAccount'
                 - 'organizations:CreateAccount'
                 - 'organizations:ListAWSServiceAccessForOrganization'
                 - 'organizations:TagResource'
                 - 'organizations:ListAccounts'
                 - 'organizations:ListRoots'
                 - 'organizations:ListTagsForResource'
                 - 'organizations:DescribeAccount'
                 - 'organizations:CreateAccount'
                 - 'organizations:ListAWSServiceAccessForOrganization'
                 - 'organizations:TagResource'
                 - 'organizations:ListAccounts'
                 - 'organizations:CloseAccount'
                 - 'organizations:DescribeOrganization'
                 - 'organizations:DescribeOrganizationalUnit'
                 - 'organizations:ListParents'
                 - 'organizations:ListOrganizationalUnitsForParent'
                 - 'organizations:MoveAccount'
                 - 'organizations:DescribeCreateAccountStatus'
                 - 'organizations:AttachPolicy'
                 - 'organizations:DescribePolicy'
                 - 'organizations:ListAccounts'
                 - 'budgets:CreateBudgetAction'
                 - 'budgets:ModifyBudget'
                 - 'budgets:ViewBudget'
                 - 'budgets:ListTagsForResource'
                 - 'iam:GetAccountSummary'
                 - 'iam:GetAccountPasswordPolicy'
                 - 'budgets:DescribeBudgetAction'
                 - 'iam:ListAccountAliases'
                 - 'sts:AssumeRole'
                 - 'iam:GetRole'
                 - 'iam:ListAccountAliases'
                 - 'iam:GetAccountPasswordPolicy'
                 - 'organizations:DetachPolicy'
                 - 'iam:GetAccountAuthorizationDetails'              
               Resource: '*'
         Groups:
           - !Ref SnowCWMemberAccountAccessGroup
   
     CreateServicenowUser:
       Type: 'AWS::IAM::User'
       Properties:
         Path: /
         UserName: !Ref SNUserName
     AddSnowUserToSnowCWMemberAccountAccessGroup:
       Type: 'AWS::IAM::UserToGroupAddition'
       Properties:
         GroupName: SnowCWMemberAccountAccessGroup
         Users:
           - !Ref SNUserName
       DependsOn: CreateServicenowUser
   
   Outputs:
     ServiceNowUserARN:
       Description: ARN of ServiceNow user
       Value: !GetAtt 
         - CreateServicenowUser
         - Arn
   
     ServiceNowUser:
       Description: ServiceNow user
       Value: !Ref SNUserName
   

4. On the Create Stack page, select Choose an existing template > Upload a template file > Choose file to choose a template file from your local computer.
5. Select Next to continue and to validate the template.
6. On the Specify stack details page, enter a CloudFormation stack name in the Stack name field.

   The stack name is an identifier that helps you find a particular stack from a list of stacks. A stack name can contain only alphanumeric characters (case-sensitive) and hyphens. It must start with an alphabetic character and can't be longer than 128 characters.

7. In the User Name field, enter a Cloud Account Management service account user name.
8. Select Next to continue.
9. On the Configure stack options page, select the I acknowledge that AWS CloudFormation might create IAM resources with custom names check box and select Next.
10. On the Review and create page, select Submit to launch your stack.
    The IAM account gets created.
11. To add security credentials:
    1. Select Resources.
    2. Select the user name link.
    3. In the Access Keys section, select Create access key.
    4. On the Access key best practices & alternatives page, choose the Third-party service option.

       You plan to use this access key to enable access for a third-party application or service that monitors or manages your AWS resources.

    5. Select the I understand the above recommendation and want to proceed to create an access key check box and select Next.
    6. Select Create access key.
    7. In the Review access keys page, download the access key file and select Done.
       Remarque :

       Share the access key and secret key with the Terraform admin and ServiceNow AI Platform admin.

Que faire ensuite

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