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name aws-verified-access-ztna description Configure AWS Verified Access to provide VPN-less zero trust network access to internal applications using identity and device posture verification with Cedar policy language. domain cybersecurity subdomain zero-trust-architecture tags ["zero-trust","aws","verified-access","ztna","cedar-policy","vpn-less","identity-verification","device-posture","aws-ram"] version 1.0 author mahipal license Apache-2.0 nist_csf ["PR.AA-01","PR.AA-05","PR.IR-01","GV.PO-01"]
Configuring AWS Verified Access for ZTNA
Overview
AWS Verified Access is a Zero Trust Network Access (ZTNA) service that provides secure, VPN-less access to corporate applications hosted in AWS. It evaluates each access request in real-time against granular conditional access policies written in the Cedar policy language, ensuring access is granted per-application only when specific security requirements such as user identity and device security posture are met and maintained. Verified Access integrates with AWS IAM Identity Center, third-party identity providers (Okta, CrowdStrike, JumpCloud, Jamf), and device management solutions. For multi-account deployments, AWS Resource Access Manager (RAM) enables sharing Verified Access groups across organizational units.
When to Use
When deploying or configuring configuring aws verified access for ztna capabilities in your environment
When establishing security controls aligned to compliance requirements
When building or improving security architecture for this domain
When conducting security assessments that require this implementation
Prerequisites
AWS account with appropriate IAM permissions
Identity provider (AWS IAM Identity Center, Okta, or OIDC-compatible)
Device trust provider (CrowdStrike, Jamf, JumpCloud, or AWS Verified Access native)
Internal Application Load Balancer (ALB) or network interface endpoint
Understanding of Cedar policy language
VPC with application workloads to protect
Architecture
End User (Browser)
|
| HTTPS
v
+------+--------+
| Verified |
| Access |
| Endpoint |
| (Public DNS) |
+------+--------+
|
+------+--------+
| Verified | <-- Cedar Access Policies
| Access | <-- Identity Provider Signals
| Instance | <-- Device Trust Signals
| (Policy |
| Evaluation) |
+------+--------+
|
+------+--------+
| Verified |
| Access Group |
| (App Group) |
+------+--------+
|
+------+--------+
| Internal ALB |
| or ENI Target |
+------+--------+
|
+------+--------+
| Application |
| (Private VPC) |
+--------------+
Core Components
Verified Access Instance
The regional entity that evaluates access requests against policies.
aws ec2 create-verified-access-instance \
--description "Production Zero Trust Instance" \
--tag-specifications 'ResourceType=verified-access-instance,Tags=[{Key=Environment,Value=production}]'
Trust Providers
Identity Trust Provider (AWS IAM Identity Center)
aws ec2 create-verified-access-trust-provider \
--trust-provider-type user \
--user-trust-provider-type iam-identity-center \
--policy-reference-name "idc" \
--description "IAM Identity Center trust provider" \
--tag-specifications 'ResourceType=verified-access-trust-provider,Tags=[{Key=Type,Value=identity}]'
Identity Trust Provider (OIDC - Okta) aws ec2 create-verified-access-trust-provider \
--trust-provider-type user \
--user-trust-provider-type oidc \
--oidc-options '{
"Issuer": "https://company.okta.com/oauth2/default",
"AuthorizationEndpoint": "https://company.okta.com/oauth2/default/v1/authorize",
"TokenEndpoint": "https://company.okta.com/oauth2/default/v1/token",
"UserInfoEndpoint": "https://company.okta.com/oauth2/default/v1/userinfo",
"ClientId": "0oa1234567890",
"ClientSecret": "client-secret-here",
"Scope": "openid profile groups"
}' \
--policy-reference-name "okta" \
--description "Okta OIDC trust provider"
Device Trust Provider (CrowdStrike) aws ec2 create-verified-access-trust-provider \
--trust-provider-type device \
--device-trust-provider-type crowdstrike \
--device-options '{
"TenantId": "crowdstrike-tenant-id",
"PublicSigningKeyUrl": "https://api.crowdstrike.com/zero-trust/v2/certificates"
}' \
--policy-reference-name "crowdstrike" \
--description "CrowdStrike device trust provider"
Attach Trust Providers to Instance
aws ec2 attach-verified-access-trust-provider \
--verified-access-instance-id vai-0123456789abcdef \
--verified-access-trust-provider-id vatp-0123456789abcdef
aws ec2 attach-verified-access-trust-provider \
--verified-access-instance-id vai-0123456789abcdef \
--verified-access-trust-provider-id vatp-device123456
Verified Access Groups
aws ec2 create-verified-access-group \
--verified-access-instance-id vai-0123456789abcdef \
--description "Production Web Applications" \
--policy-document 'permit(principal, action, resource)
when {
context.okta.groups.contains("production-access") &&
context.crowdstrike.assessment.overall > 50
};' \
--tag-specifications 'ResourceType=verified-access-group,Tags=[{Key=Tier,Value=web}]'
Verified Access Endpoints
aws ec2 create-verified-access-endpoint \
--verified-access-group-id vag-0123456789abcdef \
--endpoint-type load-balancer \
--attachment-type vpc \
--domain-certificate-arn arn:aws:acm:us-east-1:123456789012:certificate/xxxx \
--application-domain app.internal.company.com \
--endpoint-domain-prefix myapp \
--load-balancer-options '{
"LoadBalancerArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/internal-alb/xxxx",
"Port": 443,
"Protocol": "https",
"SubnetIds": ["subnet-abc123", "subnet-def456"]
}' \
--security-group-ids sg-0123456789abcdef \
--description "Internal HR Application"
Cedar Policy Language
Policy Basics // Allow access for users in the engineering group with compliant devices
permit(principal, action, resource)
when {
context.okta.groups.contains("engineering") &&
context.crowdstrike.assessment.overall > 70 &&
context.crowdstrike.assessment.sensor_config.status == "active"
};
// Deny access from unmanaged devices
forbid(principal, action, resource)
when {
!context.crowdstrike.assessment.sensor_config.status == "active"
};
Advanced Policy Examples // Time-based access - only during business hours (UTC)
permit(principal, action, resource)
when {
context.okta.groups.contains("contractors") &&
context.http_request.http_method == "GET" &&
context.crowdstrike.assessment.overall > 80
};
// Restrict admin access to specific user group with high device trust
permit(principal, action, resource)
when {
context.idc.groups.contains("admins") &&
context.crowdstrike.assessment.overall > 90 &&
context.crowdstrike.assessment.os_version.startswith("Windows 11") ||
context.crowdstrike.assessment.os_version.startswith("macOS 14")
};
// Allow read-only access for lower trust levels
permit(principal, action, resource)
when {
context.okta.groups.contains("read-only") &&
context.crowdstrike.assessment.overall > 30 &&
context.http_request.http_method == "GET"
};
Group-Level vs Endpoint-Level Policies // Group-level policy (applies to all endpoints in the group)
// Set on the Verified Access Group
permit(principal, action, resource)
when {
context.okta.groups.contains("employees") &&
context.crowdstrike.assessment.overall > 50
};
// Endpoint-level policy (additional restrictions for specific app)
// Set on the Verified Access Endpoint
permit(principal, action, resource)
when {
context.okta.groups.contains("hr-team") &&
context.okta.email.endsWith("@company.com")
};
Terraform Configuration terraform {
required_providers {
aws = {
source = "hashicorp/aws"
version = "~> 5.0"
}
}
}
# Verified Access Instance
resource "aws_verifiedaccess_instance" "main" {
description = "Production Zero Trust Access"
tags = {
Environment = "production"
}
}
# Identity Trust Provider (OIDC)
resource "aws_verifiedaccess_trust_provider" "okta" {
policy_reference_name = "okta"
trust_provider_type = "user"
user_trust_provider_type = "oidc"
description = "Okta identity provider"
oidc_options {
authorization_endpoint = "https://company.okta.com/oauth2/default/v1/authorize"
client_id = var.okta_client_id
client_secret = var.okta_client_secret
issuer = "https://company.okta.com/oauth2/default"
scope = "openid profile groups"
token_endpoint = "https://company.okta.com/oauth2/default/v1/token"
user_info_endpoint = "https://company.okta.com/oauth2/default/v1/userinfo"
}
}
# Device Trust Provider (CrowdStrike)
resource "aws_verifiedaccess_trust_provider" "crowdstrike" {
policy_reference_name = "crowdstrike"
trust_provider_type = "device"
device_trust_provider_type = "crowdstrike"
description = "CrowdStrike device trust"
device_options {
tenant_id = var.crowdstrike_tenant_id
}
}
# Attach providers to instance
resource "aws_verifiedaccess_instance_trust_provider_attachment" "okta" {
verifiedaccess_instance_id = aws_verifiedaccess_instance.main.id
verifiedaccess_trust_provider_id = aws_verifiedaccess_trust_provider.okta.id
}
resource "aws_verifiedaccess_instance_trust_provider_attachment" "crowdstrike" {
verifiedaccess_instance_id = aws_verifiedaccess_instance.main.id
verifiedaccess_trust_provider_id = aws_verifiedaccess_trust_provider.crowdstrike.id
}
# Verified Access Group
resource "aws_verifiedaccess_group" "web_apps" {
verifiedaccess_instance_id = aws_verifiedaccess_instance.main.id
description = "Production Web Applications"
policy_document = <<-CEDAR
permit(principal, action, resource)
when {
context.okta.groups.contains("production-access") &&
context.crowdstrike.assessment.overall > 50
};
CEDAR
tags = {
Tier = "web"
}
}
# Verified Access Endpoint
resource "aws_verifiedaccess_endpoint" "internal_app" {
verified_access_group_id = aws_verifiedaccess_group.web_apps.id
endpoint_type = "load-balancer"
attachment_type = "vpc"
domain_certificate_arn = aws_acm_certificate.app.arn
application_domain = "app.internal.company.com"
endpoint_domain_prefix = "myapp"
description = "Internal Application"
load_balancer_options {
load_balancer_arn = aws_lb.internal.arn
port = 443
protocol = "https"
subnet_ids = var.private_subnet_ids
}
security_group_ids = [aws_security_group.verified_access.id]
policy_document = <<-CEDAR
permit(principal, action, resource)
when {
context.okta.groups.contains("app-users")
};
CEDAR
}
# Logging configuration
resource "aws_verifiedaccess_instance_logging_configuration" "main" {
verifiedaccess_instance_id = aws_verifiedaccess_instance.main.id
access_logs {
cloudwatch_logs {
enabled = true
log_group = aws_cloudwatch_log_group.verified_access.name
}
s3 {
enabled = true
bucket_name = aws_s3_bucket.access_logs.id
prefix = "verified-access/"
}
}
}
resource "aws_cloudwatch_log_group" "verified_access" {
name = "/aws/verified-access/production"
retention_in_days = 90
}
Multi-Account Deployment with AWS RAM # Share Verified Access Group across accounts via RAM
resource "aws_ram_resource_share" "verified_access" {
name = "verified-access-share"
allow_external_principals = false
}
resource "aws_ram_resource_association" "group_share" {
resource_arn = aws_verifiedaccess_group.web_apps.verified_access_group_arn
resource_share_arn = aws_ram_resource_share.verified_access.arn
}
resource "aws_ram_principal_association" "workload_ou" {
principal = "arn:aws:organizations::123456789012:ou/o-xxxx/ou-xxxx-xxxxxxxx"
resource_share_arn = aws_ram_resource_share.verified_access.arn
}
Monitoring and Logging
aws logs filter-log-events \
--log-group-name /aws/verified-access/production \
--filter-pattern '{ $.status_code = "403" }' \
--start-time $(date -d '1 hour ago' +%s000)
aws cloudwatch put-metric-alarm \
--alarm-name "VerifiedAccess-HighDenialRate" \
--metric-name "AccessDenied" \
--namespace "AWS/VerifiedAccess" \
--statistic Sum \
--period 300 \
--threshold 100 \
--comparison-operator GreaterThanThreshold \
--evaluation-periods 2 \
--alarm-actions arn:aws:sns:us-east-1:123456789012:security-alerts
Security Best Practices
Layer policies : Use group-level policies for broad controls and endpoint-level for app-specific restrictionsRequire device trust : Always include device posture checks in Cedar policiesEnable access logging : Send to both CloudWatch and S3 for real-time monitoring and long-term retentionUse RAM for multi-account : Share groups across OUs instead of duplicating configurationRotate OIDC secrets : Automate client secret rotation via Secrets ManagerTest policies in non-production : Validate Cedar policies before production deploymentSet high device trust thresholds : Require overall score above 70 for production accessMonitor for policy drift : Use AWS Config rules to detect unauthorized changes
References 