Manage GCP Identity-Aware Proxy Tunnel Destination Group IAM Policies

The gcp:iap/tunnelDestGroupIamPolicy:TunnelDestGroupIamPolicy resource, part of the Pulumi GCP provider, manages IAM policies for Identity-Aware Proxy tunnel destination groups, controlling who can access specific tunnel endpoints. This guide focuses on four capabilities: authoritative policy replacement, role-based binding management, non-authoritative member grants, and time-based IAM Conditions.

These resources reference existing tunnel destination groups and operate at different levels of control. TunnelDestGroupIamPolicy replaces the entire policy, TunnelDestGroupIamBinding manages all members for one role, and TunnelDestGroupIamMember adds individual members. The examples are intentionally small. Choose the resource that matches your management model and combine it with your own tunnel groups.

Replace the entire IAM policy for a tunnel group

When you need complete control over access, TunnelDestGroupIamPolicy replaces the entire IAM policy with your specified bindings.

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

const admin = gcp.organizations.getIAMPolicy({
    bindings: [{
        role: "roles/iap.tunnelResourceAccessor",
        members: ["user:jane@example.com"],
    }],
});
const policy = new gcp.iap.TunnelDestGroupIamPolicy("policy", {
    project: destGroup.project,
    region: destGroup.region,
    destGroup: destGroup.groupName,
    policyData: admin.then(admin => admin.policyData),
});

import pulumi
import pulumi_gcp as gcp

admin = gcp.organizations.get_iam_policy(bindings=[{
    "role": "roles/iap.tunnelResourceAccessor",
    "members": ["user:jane@example.com"],
}])
policy = gcp.iap.TunnelDestGroupIamPolicy("policy",
    project=dest_group["project"],
    region=dest_group["region"],
    dest_group=dest_group["groupName"],
    policy_data=admin.policy_data)

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/iap"
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/organizations"
	"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		admin, err := organizations.LookupIAMPolicy(ctx, &organizations.LookupIAMPolicyArgs{
			Bindings: []organizations.GetIAMPolicyBinding{
				{
					Role: "roles/iap.tunnelResourceAccessor",
					Members: []string{
						"user:jane@example.com",
					},
				},
			},
		}, nil)
		if err != nil {
			return err
		}
		_, err = iap.NewTunnelDestGroupIamPolicy(ctx, "policy", &iap.TunnelDestGroupIamPolicyArgs{
			Project:    pulumi.Any(destGroup.Project),
			Region:     pulumi.Any(destGroup.Region),
			DestGroup:  pulumi.Any(destGroup.GroupName),
			PolicyData: pulumi.String(admin.PolicyData),
		})
		if err != nil {
			return err
		}
		return nil
	})
}

using System.Collections.Generic;
using System.Linq;
using Pulumi;
using Gcp = Pulumi.Gcp;

return await Deployment.RunAsync(() => 
{
    var admin = Gcp.Organizations.GetIAMPolicy.Invoke(new()
    {
        Bindings = new[]
        {
            new Gcp.Organizations.Inputs.GetIAMPolicyBindingInputArgs
            {
                Role = "roles/iap.tunnelResourceAccessor",
                Members = new[]
                {
                    "user:jane@example.com",
                },
            },
        },
    });

    var policy = new Gcp.Iap.TunnelDestGroupIamPolicy("policy", new()
    {
        Project = destGroup.Project,
        Region = destGroup.Region,
        DestGroup = destGroup.GroupName,
        PolicyData = admin.Apply(getIAMPolicyResult => getIAMPolicyResult.PolicyData),
    });

});

package generated_program;

import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.gcp.organizations.OrganizationsFunctions;
import com.pulumi.gcp.organizations.inputs.GetIAMPolicyArgs;
import com.pulumi.gcp.iap.TunnelDestGroupIamPolicy;
import com.pulumi.gcp.iap.TunnelDestGroupIamPolicyArgs;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;

public class App {
    public static void main(String[] args) {
        Pulumi.run(App::stack);
    }

    public static void stack(Context ctx) {
        final var admin = OrganizationsFunctions.getIAMPolicy(GetIAMPolicyArgs.builder()
            .bindings(GetIAMPolicyBindingArgs.builder()
                .role("roles/iap.tunnelResourceAccessor")
                .members("user:jane@example.com")
                .build())
            .build());

        var policy = new TunnelDestGroupIamPolicy("policy", TunnelDestGroupIamPolicyArgs.builder()
            .project(destGroup.project())
            .region(destGroup.region())
            .destGroup(destGroup.groupName())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:iap:TunnelDestGroupIamPolicy
    properties:
      project: ${destGroup.project}
      region: ${destGroup.region}
      destGroup: ${destGroup.groupName}
      policyData: ${admin.policyData}
variables:
  admin:
    fn::invoke:
      function: gcp:organizations:getIAMPolicy
      arguments:
        bindings:
          - role: roles/iap.tunnelResourceAccessor
            members:
              - user:jane@example.com

The getIAMPolicy data source constructs the policy document with role-to-members mappings. The TunnelDestGroupIamPolicy resource applies this policy to the tunnel group identified by project, region, and destGroup. This approach is authoritative: it removes any bindings not included in policyData.

Grant a role to multiple members at once

TunnelDestGroupIamBinding manages all members for a single role while preserving other roles in the policy.

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

const binding = new gcp.iap.TunnelDestGroupIamBinding("binding", {
    project: destGroup.project,
    region: destGroup.region,
    destGroup: destGroup.groupName,
    role: "roles/iap.tunnelResourceAccessor",
    members: ["user:jane@example.com"],
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.iap.TunnelDestGroupIamBinding("binding",
    project=dest_group["project"],
    region=dest_group["region"],
    dest_group=dest_group["groupName"],
    role="roles/iap.tunnelResourceAccessor",
    members=["user:jane@example.com"])

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/iap"
	"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := iap.NewTunnelDestGroupIamBinding(ctx, "binding", &iap.TunnelDestGroupIamBindingArgs{
			Project:   pulumi.Any(destGroup.Project),
			Region:    pulumi.Any(destGroup.Region),
			DestGroup: pulumi.Any(destGroup.GroupName),
			Role:      pulumi.String("roles/iap.tunnelResourceAccessor"),
			Members: pulumi.StringArray{
				pulumi.String("user:jane@example.com"),
			},
		})
		if err != nil {
			return err
		}
		return nil
	})
}

using System.Collections.Generic;
using System.Linq;
using Pulumi;
using Gcp = Pulumi.Gcp;

return await Deployment.RunAsync(() => 
{
    var binding = new Gcp.Iap.TunnelDestGroupIamBinding("binding", new()
    {
        Project = destGroup.Project,
        Region = destGroup.Region,
        DestGroup = destGroup.GroupName,
        Role = "roles/iap.tunnelResourceAccessor",
        Members = new[]
        {
            "user:jane@example.com",
        },
    });

});

package generated_program;

import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.gcp.iap.TunnelDestGroupIamBinding;
import com.pulumi.gcp.iap.TunnelDestGroupIamBindingArgs;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;

public class App {
    public static void main(String[] args) {
        Pulumi.run(App::stack);
    }

    public static void stack(Context ctx) {
        var binding = new TunnelDestGroupIamBinding("binding", TunnelDestGroupIamBindingArgs.builder()
            .project(destGroup.project())
            .region(destGroup.region())
            .destGroup(destGroup.groupName())
            .role("roles/iap.tunnelResourceAccessor")
            .members("user:jane@example.com")
            .build());

    }
}

resources:
  binding:
    type: gcp:iap:TunnelDestGroupIamBinding
    properties:
      project: ${destGroup.project}
      region: ${destGroup.region}
      destGroup: ${destGroup.groupName}
      role: roles/iap.tunnelResourceAccessor
      members:
        - user:jane@example.com

The role property specifies which IAM role to manage. The members array lists all identities that should have this role. Other roles in the tunnel group’s policy remain unchanged, but this resource owns the complete member list for roles/iap.tunnelResourceAccessor.

Add a single member to a role non-authoritatively

TunnelDestGroupIamMember adds one member to a role without affecting other members or roles.

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

const member = new gcp.iap.TunnelDestGroupIamMember("member", {
    project: destGroup.project,
    region: destGroup.region,
    destGroup: destGroup.groupName,
    role: "roles/iap.tunnelResourceAccessor",
    member: "user:jane@example.com",
});

import pulumi
import pulumi_gcp as gcp

member = gcp.iap.TunnelDestGroupIamMember("member",
    project=dest_group["project"],
    region=dest_group["region"],
    dest_group=dest_group["groupName"],
    role="roles/iap.tunnelResourceAccessor",
    member="user:jane@example.com")

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/iap"
	"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := iap.NewTunnelDestGroupIamMember(ctx, "member", &iap.TunnelDestGroupIamMemberArgs{
			Project:   pulumi.Any(destGroup.Project),
			Region:    pulumi.Any(destGroup.Region),
			DestGroup: pulumi.Any(destGroup.GroupName),
			Role:      pulumi.String("roles/iap.tunnelResourceAccessor"),
			Member:    pulumi.String("user:jane@example.com"),
		})
		if err != nil {
			return err
		}
		return nil
	})
}

using System.Collections.Generic;
using System.Linq;
using Pulumi;
using Gcp = Pulumi.Gcp;

return await Deployment.RunAsync(() => 
{
    var member = new Gcp.Iap.TunnelDestGroupIamMember("member", new()
    {
        Project = destGroup.Project,
        Region = destGroup.Region,
        DestGroup = destGroup.GroupName,
        Role = "roles/iap.tunnelResourceAccessor",
        Member = "user:jane@example.com",
    });

});

package generated_program;

import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.gcp.iap.TunnelDestGroupIamMember;
import com.pulumi.gcp.iap.TunnelDestGroupIamMemberArgs;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;

public class App {
    public static void main(String[] args) {
        Pulumi.run(App::stack);
    }

    public static void stack(Context ctx) {
        var member = new TunnelDestGroupIamMember("member", TunnelDestGroupIamMemberArgs.builder()
            .project(destGroup.project())
            .region(destGroup.region())
            .destGroup(destGroup.groupName())
            .role("roles/iap.tunnelResourceAccessor")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:iap:TunnelDestGroupIamMember
    properties:
      project: ${destGroup.project}
      region: ${destGroup.region}
      destGroup: ${destGroup.groupName}
      role: roles/iap.tunnelResourceAccessor
      member: user:jane@example.com

The member property (singular) specifies one identity to grant access. Unlike TunnelDestGroupIamBinding, this resource doesn’t claim ownership of the full member list. You can use multiple TunnelDestGroupIamMember resources for the same role, or combine them with TunnelDestGroupIamBinding resources for different roles.

Apply time-based access with IAM Conditions

IAM Conditions add temporal or attribute-based constraints to permissions, such as expiring access after a specific date.

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

const admin = gcp.organizations.getIAMPolicy({
    bindings: [{
        role: "roles/iap.tunnelResourceAccessor",
        members: ["user:jane@example.com"],
        condition: {
            title: "expires_after_2019_12_31",
            description: "Expiring at midnight of 2019-12-31",
            expression: "request.time < timestamp(\"2020-01-01T00:00:00Z\")",
        },
    }],
});
const policy = new gcp.iap.TunnelDestGroupIamPolicy("policy", {
    project: destGroup.project,
    region: destGroup.region,
    destGroup: destGroup.groupName,
    policyData: admin.then(admin => admin.policyData),
});

import pulumi
import pulumi_gcp as gcp

admin = gcp.organizations.get_iam_policy(bindings=[{
    "role": "roles/iap.tunnelResourceAccessor",
    "members": ["user:jane@example.com"],
    "condition": {
        "title": "expires_after_2019_12_31",
        "description": "Expiring at midnight of 2019-12-31",
        "expression": "request.time < timestamp(\"2020-01-01T00:00:00Z\")",
    },
}])
policy = gcp.iap.TunnelDestGroupIamPolicy("policy",
    project=dest_group["project"],
    region=dest_group["region"],
    dest_group=dest_group["groupName"],
    policy_data=admin.policy_data)

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/iap"
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/organizations"
	"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		admin, err := organizations.LookupIAMPolicy(ctx, &organizations.LookupIAMPolicyArgs{
			Bindings: []organizations.GetIAMPolicyBinding{
				{
					Role: "roles/iap.tunnelResourceAccessor",
					Members: []string{
						"user:jane@example.com",
					},
					Condition: {
						Title:       "expires_after_2019_12_31",
						Description: pulumi.StringRef("Expiring at midnight of 2019-12-31"),
						Expression:  "request.time < timestamp(\"2020-01-01T00:00:00Z\")",
					},
				},
			},
		}, nil)
		if err != nil {
			return err
		}
		_, err = iap.NewTunnelDestGroupIamPolicy(ctx, "policy", &iap.TunnelDestGroupIamPolicyArgs{
			Project:    pulumi.Any(destGroup.Project),
			Region:     pulumi.Any(destGroup.Region),
			DestGroup:  pulumi.Any(destGroup.GroupName),
			PolicyData: pulumi.String(admin.PolicyData),
		})
		if err != nil {
			return err
		}
		return nil
	})
}

using System.Collections.Generic;
using System.Linq;
using Pulumi;
using Gcp = Pulumi.Gcp;

return await Deployment.RunAsync(() => 
{
    var admin = Gcp.Organizations.GetIAMPolicy.Invoke(new()
    {
        Bindings = new[]
        {
            new Gcp.Organizations.Inputs.GetIAMPolicyBindingInputArgs
            {
                Role = "roles/iap.tunnelResourceAccessor",
                Members = new[]
                {
                    "user:jane@example.com",
                },
                Condition = new Gcp.Organizations.Inputs.GetIAMPolicyBindingConditionInputArgs
                {
                    Title = "expires_after_2019_12_31",
                    Description = "Expiring at midnight of 2019-12-31",
                    Expression = "request.time < timestamp(\"2020-01-01T00:00:00Z\")",
                },
            },
        },
    });

    var policy = new Gcp.Iap.TunnelDestGroupIamPolicy("policy", new()
    {
        Project = destGroup.Project,
        Region = destGroup.Region,
        DestGroup = destGroup.GroupName,
        PolicyData = admin.Apply(getIAMPolicyResult => getIAMPolicyResult.PolicyData),
    });

});

package generated_program;

import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.gcp.organizations.OrganizationsFunctions;
import com.pulumi.gcp.organizations.inputs.GetIAMPolicyArgs;
import com.pulumi.gcp.iap.TunnelDestGroupIamPolicy;
import com.pulumi.gcp.iap.TunnelDestGroupIamPolicyArgs;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;

public class App {
    public static void main(String[] args) {
        Pulumi.run(App::stack);
    }

    public static void stack(Context ctx) {
        final var admin = OrganizationsFunctions.getIAMPolicy(GetIAMPolicyArgs.builder()
            .bindings(GetIAMPolicyBindingArgs.builder()
                .role("roles/iap.tunnelResourceAccessor")
                .members("user:jane@example.com")
                .condition(GetIAMPolicyBindingConditionArgs.builder()
                    .title("expires_after_2019_12_31")
                    .description("Expiring at midnight of 2019-12-31")
                    .expression("request.time < timestamp(\"2020-01-01T00:00:00Z\")")
                    .build())
                .build())
            .build());

        var policy = new TunnelDestGroupIamPolicy("policy", TunnelDestGroupIamPolicyArgs.builder()
            .project(destGroup.project())
            .region(destGroup.region())
            .destGroup(destGroup.groupName())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:iap:TunnelDestGroupIamPolicy
    properties:
      project: ${destGroup.project}
      region: ${destGroup.region}
      destGroup: ${destGroup.groupName}
      policyData: ${admin.policyData}
variables:
  admin:
    fn::invoke:
      function: gcp:organizations:getIAMPolicy
      arguments:
        bindings:
          - role: roles/iap.tunnelResourceAccessor
            members:
              - user:jane@example.com
            condition:
              title: expires_after_2019_12_31
              description: Expiring at midnight of 2019-12-31
              expression: request.time < timestamp("2020-01-01T00:00:00Z")

The condition block adds constraints to the binding. The expression uses CEL (Common Expression Language) to define when the binding applies. Here, request.time checks the current timestamp against a deadline. The title and description provide human-readable context. Conditions work with all three IAM resource types (Policy, Binding, Member).

Beyond these examples

These snippets focus on specific IAM management features: authoritative vs non-authoritative management, role-based and member-based access control, and time-based IAM Conditions. They’re intentionally minimal rather than full access control configurations.

The examples reference pre-existing infrastructure such as IAP tunnel destination groups and GCP projects and regions. They focus on IAM policy configuration rather than provisioning the tunnel groups themselves.

To keep things focused, common IAM patterns are omitted, including:

Attribute-based conditions beyond time (resource tags, request attributes)
Multiple conditions per binding
Service account impersonation patterns
Cross-project IAM delegation

These omissions are intentional: the goal is to illustrate how each IAM resource type is wired, not provide drop-in access control modules. See the IAP TunnelDestGroupIamPolicy resource reference for all available configuration options.

Let's manage GCP Identity-Aware Proxy Tunnel Destination Group IAM Policies

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Frequently Asked Questions

Resource Selection & Conflicts

Which IAM resource type should I use for managing tunnel destination group access?

Choose based on your management style:

gcp.iap.TunnelDestGroupIamPolicy - Authoritative, replaces the entire IAM policy
gcp.iap.TunnelDestGroupIamBinding - Authoritative for a specific role, preserves other roles
gcp.iap.TunnelDestGroupIamMember - Non-authoritative, adds individual members while preserving existing ones

Why am I getting IAM policy conflicts between my resources?

gcp.iap.TunnelDestGroupIamPolicy cannot be used with gcp.iap.TunnelDestGroupIamBinding or gcp.iap.TunnelDestGroupIamMember because they’ll conflict over policy management. Choose either Policy (authoritative) or Binding/Member (granular).

Can I use TunnelDestGroupIamBinding and TunnelDestGroupIamMember together?

Yes, but only if they manage different roles. Using both for the same role will cause conflicts.

Configuration & Requirements

Why must the region match my network resources?

The region parameter must be the same as the network resources in the tunnel destination group to ensure proper resource binding.

How do I generate the policyData for TunnelDestGroupIamPolicy?

Use the gcp.organizations.getIAMPolicy data source to generate policy data, then pass it to the policyData parameter.

Which properties are immutable after creation?

The destGroup, project, and region properties cannot be changed after resource creation.

IAM Conditions

What are the limitations of IAM Conditions for this resource?

IAM Conditions are supported but have known limitations. Review the GCP IAM Conditions documentation before implementing conditional access policies.

How do I add time-based expiration to IAM bindings?

Add a condition block with title, description, and expression. For example, use request.time < timestamp("2020-01-01T00:00:00Z") to expire access at a specific time.

Import & Migration

What identifier formats can I use when importing IAM resources?

You can use multiple formats, from most specific to least:

projects/{{project}}/iap_tunnel/locations/{{region}}/destGroups/{{dest_group}}
{{project}}/{{region}}/{{dest_group}}
{{region}}/{{dest_group}}
{{dest_group}}

Missing values are taken from the provider configuration.

Using a different cloud?

Explore security guides for other cloud providers:

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