Citrix Virtual Apps and Desktops

Connection to AWS

Create and manage connections and resources describes the wizards that create a connection. The following information covers details specific to AWS cloud environments.

Note:

Before creating a connection to AWS, you need to first finish setting up your AWS account as a resource location. See AWS cloud environments.

Create a connection

When you create a connection from Web Studio:

  • You must provide the API key and secret key values. You can export the key file containing those values from AWS and then import them. You must also provide the region, availability zone, VPC name, subnet addresses, domain name, security group names, and credentials.
  • The credentials file for the root AWS account (retrieved from the AWS console) is not formatted the same as credentials files downloaded for standard AWS users. Therefore, Citrix Virtual Apps and Desktops management cannot use the file to populate the API key and secret key fields. Ensure that you are using AWS Identity Access Management (IAM) credentials files.

Note:

After you create a connection, attempts to update the API key and secret key might fail. To resolve the issue, check your proxy server or firewall restrictions and ensure that the following address is contactable: https://*.amazonaws.com.

Host connection default values

When you create host connections in AWS cloud environments, the following default values are displayed:

Option Absolute Percentage
Simultaneous actions (all types) 125 100
Maximum new actions per minute 125  

MCS supports 100 maximum concurrent provisioning operations by default.

Service endpoint URL

Standard zone service endpoint URL

When you use MCS, a new AWS connection is added with an API key and an API secret. With this information, along with the authenticated account, MCS queries AWS for the supported zones using the AWS DescribeRegions EC2 API call. The query is made using a generic EC2 Service Endpoint URL https://ec2.amazonaws.com/. Use MCS to select the zone for the connection from the list of supported zones. The preferred AWS service endpoint URL is automatically selected for the zone. However, after you create the service endpoint URL, you can no longer set or modify the URL.

Non-standard service endpoint URL

There can be situations where you might not need the automatically chosen AWS Service Endpoint URL for the connection. For such cases, you can use Citrix Cloud SDK and PowerShell to create a connection with a non-standard service endpoint URL. For example, to create a connection using the service endpoint URL https://ec2.cn-north-1.amazonaws.com.cn:

  1. Set up the AWS hosted Cloud Connector and ensure that it has connectivity.
  2. Run the following PowerShell commands to see the list of Cloud Connectors.

     PS C:\> asnp citrix.*
     PS C:\> Get-XDAuthentication
     PS C:\> Get-ConfigEdgeServer
    <!--NeedCopy-->
    
  3. Find the ZoneUid from the newly created Cloud Connector and enter it into the following PowerShell commands. Replace the italicized items with the respective values.

    PS C:\> $hyp= New-Item -Path xdhyp:\Connections -ZoneUidZoneUid-Name“My New Connection”-ConnectionType "AWS" -HypervisorAddress @("https://ec2.cn-north-1.amazonaws.com.cn") -UserName“APIkey” -Password“API Secret” -Persist PS C:\> New-BrokerHypervisorConnection -HypHypervisorConnectionUid $hyp. HypervisorConnectionUid

  4. Refresh the Configuration > Hosting tab to verify that the EC2 connection has been created.
  5. Add a resource location using the new connection.

Define IAM permissions

Use the information in this section to define IAM permissions for Citrix Virtual Apps and Desktops on AWS. Amazon’s IAM service permits accounts having multiple users, which can be further organized into groups. These users can possess different permissions to control their ability to perform operations associated with the account. For more information about IAM permissions, see IAM JSON policy reference.

To apply IAM permissions policy to a new group of users:

  1. Log in to the AWS management console and select the IAM service from the drop-down list.
  2. Select Create a New Group of Users.
  3. Type a name for the new user group and select Continue.
  4. On the Permissions page, choose Custom Policy. Select Select.
  5. Type a name for the Permissions policy.
  6. In the Policy Document section, enter relevant permissions.

After entering the policy information, selectContinue to complete the group of users. Users in the group are granted permissions to perform only those actions that are required for Citrix Virtual Apps and Desktops.

Important:

Use the policy text provided in the example earlier to list the actions that Citrix Virtual Apps and Desktops uses to perform actions within an AWS account without restricting those actions to specific resources. Citrix recommends that you use the example for testing purposes. For production environments, you might choose to add further restrictions on resources.

Set IAM permissions

Set the permissions in the IAM section of the AWS Management Console:

  1. In the Summary panel, select the Permissions tab.
  2. Select Add permissions.

Identity and Access Management (IAM)

In the Add Permissions to screen, grant permissions:

Grant permissions for IAM policies

Use the following as an example in the JSON tab:

JSON example

Tip:

The noted JSON example might not include all the permissions for your environment. See How to Define Identity Access Management Permissions Running Citrix Virtual Apps and Desktops on AWS for more information.

Required AWS permissions

This section contains the complete list of AWS permissions.

Note:

The iam:PassRole permission is needed only for role_based_auth.

Creating a host connection

A new host connection is added using the information from AWS.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "ec2:DescribeAvailabilityZones",
                "ec2:DescribeImages",
                "ec2:DescribeInstances",
                "ec2:DescribeInstanceTypes",
                "ec2:DescribeSecurityGroups",
                "ec2:DescribeSubnets",
                "ec2:DescribeVpcs"
            ],
            "Effect": "Allow",
            "Resource": "*"
        }
    ]
}
<!--NeedCopy-->

Power management of VMs

Machine instances are powered on or off.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "ec2:AttachVolume",
                "ec2:CreateVolume",
                "ec2:DeleteVolume",
                "ec2:DescribeInstances",
                "ec2:DescribeVolumes",
                "ec2:DetachVolume",
                "ec2:StartInstances",
                "ec2:StopInstances"
            ],
            "Effect": "Allow",
            "Resource": "*"
        }
    ]
}
<!--NeedCopy-->

Creating, updating, or deleting VMs

A machine catalog is created, updated, or deleted with VMs provisioned as AWS instances.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "ec2:AttachVolume",
                "ec2:AssociateIamInstanceProfile",
                "ec2:AuthorizeSecurityGroupEgress",
                "ec2:AuthorizeSecurityGroupIngress",
                "ec2:CreateImage",
                "ec2:CreateLaunchTemplate",
                "ec2:CreateSecurityGroup",
                "ec2:CreateTags",
                "ec2:CreateVolume",
                "ec2:DeleteVolume",
                "ec2:DescribeAccountAttributes",
                "ec2:DescribeAvailabilityZones",
                "ec2:DescribeIamInstanceProfileAssociations",
                "ec2:DescribeImages",
                "ec2:DescribeInstances",
                "ec2:DescribeInstanceTypes",
                "ec2:DescribeLaunchTemplates",
                "ec2:DescribeLaunchTemplateVersions",
                "ec2:DescribeNetworkInterfaces",
                "ec2:DescribeRegions",
                "ec2:DescribeSecurityGroups",
                "ec2:DescribeSnapshots",
                "ec2:DescribeSubnets",
                "ec2:DescribeTags",
                "ec2:DescribeVolumes",
                "ec2:DescribeVpcs",
                "ec2:DetachVolume",
                "ec2:DisassociateIamInstanceProfile",
                "ec2:RunInstances",
                "ec2:StartInstances",
                "ec2:StopInstances",
                "ec2:TerminateInstances"
            ],
            "Effect": "Allow",
            "Resource": "*"
        },
        {
            "Action": [
                "ec2:AuthorizeSecurityGroupEgress",
                "ec2:AuthorizeSecurityGroupIngress",
                "ec2:CreateSecurityGroup",
                "ec2:DeleteSecurityGroup",
                "ec2:RevokeSecurityGroupEgress",
                "ec2:RevokeSecurityGroupIngress"
            ],
            "Effect": "Allow",
            "Resource": "*"
        },
        {
            "Action": [
                "s3:CreateBucket",
                "s3:DeleteBucket",
                "s3:PutBucketAcl",
                "s3:PutBucketTagging",
                "s3:PutObject",
                "s3:GetObject",
                "s3:DeleteObject",
                "s3:PutObjectTagging"
            ],
            "Effect": "Allow",
            "Resource": "arn:aws:s3:::citrix*"
        },
        {
            "Action": [
                "ebs:StartSnapshot",
                "ebs:GetSnapshotBlock",
                "ebs:PutSnapshotBlock",
                "ebs:CompleteSnapshot",
                "ebs:ListSnapshotBlocks",
                "ebs:ListChangedBlocks",
                "ec2:CreateSnapshot"
            ],
            "Effect": "Allow",
            "Resource": "*"
        }
    ]
}
<!--NeedCopy-->

Note:

The EC2 section related to security groups is only needed if an isolation security group must be created for the preparation VM during catalog creation. Once this is done, these permissions are not required.

Direct disk upload and download

Direct disk upload eliminates the volume worker requirement for machine catalog provisioning, and instead uses public APIs provided by AWS. This functionality reduces the cost associated with extra storage accounts and the complexity for maintaining volume worker operations.

Note:

The support for volume worker is deprecated.

Following permissions must be added to the policy:

  • ebs:StartSnapshot
  • ebs:GetSnapshotBlock
  • ebs:PutSnapshotBlock
  • ebs:CompleteSnapshot
  • ebs:ListSnapshotBlocks
  • ebs:ListChangedBlocks
  • ec2:CreateSnapshot
  • ec2:DescribeLaunchTemplates

Important:

  • You can add a VM to existing machine catalogs without any volume worker operation such as volume worker AMI, and volume worker VM.
  • If you delete an existing catalog that used volume worker before, all artifacts including volume worker related are deleted.

EBS encryption of created volumes

EBS can auto-encrypt newly created volumes if the AMI is encrypted, or EBS is configured to encrypt all new volumes. However, to implement the functionality, the following permissions must be included in the IAM policy.

{
     "Version": "2012-10-17",
     "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                 "kms:CreateGrant",
                 "kms:Decrypt",
                 "kms:DescribeKey",
                 "kms:GenerateDataKeyWithoutPlainText",
                 "kms:ReEncryptTo",
                 "kms:ReEncryptFrom"
            ],
            "Resource": "*"
        }
    ]
}
<!--NeedCopy-->

Note:

The permissions can be limited to specific keys by including a Resource and Condition block at the discretion of the user. For example, KMS Permissions with Condition:

{
     "Version": "2012-10-17",
     "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                 "kms:CreateGrant",
                 "kms:Decrypt",
                 "kms:DescribeKey",
                 "kms:GenerateDataKeyWithoutPlainText",
                 "kms:ReEncryptTo",
                 "kms:ReEncryptFrom"
            ],
            "Resource": [
                "arn:aws:kms:us-east-2:123456789012:key/abcd1234-a123-456d-a12b-a123b4cd56ef"
            ],
            "Condition": {
                "Bool": {
                    "kms:GrantIsForAWSResource": true
                }
            }
        }
    ]
}
<!--NeedCopy-->

The following key policy statement is the entire default key policy for KMS keys that is required to allow the account to use IAM policies to delegate permission for all actions (kms:*) on the KMS key.

{
"Sid": "Enable IAM policies",
"Effect": "Allow",
"Principal": {
"AWS": "arn:aws:iam::111122223333:root"
},
"Action": "kms:",
"Resource": ""
}
<!--NeedCopy-->

For more information, see AWS Key Management Service official documentation.

IAM role-based authentication

The following permissions are added to support role-based authentication.

{
     "Version": "2012-10-17",
     "Statement": [
        {
            "Effect": "Allow",
            "Action": "iam:PassRole",
            "Resource": "arn:aws:iam::*:role/*"
        }
    ]
}
<!--NeedCopy-->

Minimal IAM permissions policy

The following JSON can be used for all currently supported features. You can create host connections, create, update, or delete VMs, and do power management using this policy. The policy can be applied to the users as explained in Define IAM permissions sections or you can also use role-based authentication using role_based_auth security key and secret key.

Important:

To use role_based_auth, first configure the desired IAM role on the cloud connector ec2 instance when setting up the cloud connector. Using Web Studio, add the hosting connection and supply the role_based_auth for the authentication key and secret. A hosting connection with these settings then uses role-based authentication.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "ec2:AttachVolume",
                "ec2:AssociateIamInstanceProfile",
                "ec2:AuthorizeSecurityGroupEgress",
                "ec2:AuthorizeSecurityGroupIngress",
                "ec2:CreateImage",
                "ec2:CreateLaunchTemplate",
                "ec2:CreateNetworkInterface",
                "ec2:CreateTags",
                "ec2:CreateVolume",
                "ec2:DeleteLaunchTemplate",
                "ec2:DeleteNetworkInterface",
                "ec2:DeleteSecurityGroup",
                "ec2:DeleteSnapshot",
                "ec2:DeleteTags",
                "ec2:DeleteVolume",
                "ec2:DeregisterImage",
                "ec2:DescribeAccountAttributes",
                "ec2:DescribeAvailabilityZones",
                "ec2:DescribeIamInstanceProfileAssociations",
                "ec2:DescribeImages",
                "ec2:DescribeInstances",
                "ec2:DescribeInstanceTypes",
                "ec2:DescribeLaunchTemplates",
                "ec2:DescribeLaunchTemplateVersions",
                "ec2:DescribeNetworkInterfaces",
                "ec2:DescribeRegions",
                "ec2:DescribeSecurityGroups",
                "ec2:DescribeSnapshots",
                "ec2:DescribeSubnets",
                "ec2:DescribeTags",
                "ec2:DescribeVolumes",
                "ec2:DescribeVpcs",
                "ec2:DetachVolume",
                "ec2:DisassociateIamInstanceProfile",
                "ec2:RebootInstances",
                "ec2:RunInstances",
                "ec2:StartInstances",
                "ec2:StopInstances",
                "ec2:TerminateInstances"
            ],
            "Effect": "Allow",
            "Resource": "*"
        },
        {
            "Action": [
                "ec2:AuthorizeSecurityGroupEgress",
                "ec2:AuthorizeSecurityGroupIngress",
                "ec2:CreateSecurityGroup",
                "ec2:DeleteSecurityGroup",
                "ec2:RevokeSecurityGroupEgress",
                "ec2:RevokeSecurityGroupIngress"
            ],
            "Effect": "Allow",
            "Resource": "*"
        },
        {
            "Action": [
                "s3:CreateBucket",
                "s3:DeleteBucket",
                "s3:DeleteObject",
                "s3:GetObject",
                "s3:PutBucketAcl",
                "s3:PutObject",
                "s3:PutBucketTagging",
                "s3:PutObjectTagging"
            ],
            "Effect": "Allow",
            "Resource": "arn:aws:s3:::citrix*"
        },
        {
            "Action": [
                "ebs:StartSnapshot",
                "ebs:GetSnapshotBlock",
                "ebs:PutSnapshotBlock",
                "ebs:CompleteSnapshot",
                "ebs:ListSnapshotBlocks",
                "ebs:ListChangedBlocks",
                "ec2:CreateSnapshot"
            ],
            "Effect": "Allow",
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": [
                 "kms:CreateGrant",
                 "kms:Decrypt",
                 "kms:DescribeKey",
                 "kms:GenerateDataKeyWithoutPlainText",
                 "kms:GenerateDataKey",
                 "kms:ReEncryptTo",
                 "kms:ReEncryptFrom"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "iam:PassRole",
            "Resource": "arn:aws:iam::*:role/*"
        }
    ]
}
<!--NeedCopy-->

Note:

  • The EC2 section related to SecurityGroups is only needed if an Isolation Security Group must be created for the Preparation VM during catalog creation. Once this is done, these permissions are not required.
  • The KMS section is only required when using EBS volume encryption.
  • The iam:PassRole permission section is needed only for role_based_auth.
  • Specific resource-level permissions can be added instead of full access based on your requirements and environment. Refer to AWS documents Demystifying EC2 Resource-Level Permissions and Access management for AWS resources for more details.

Where to go next

More information

Connection to AWS