implementing-zero-trust-with-hashicorp-boundary

name	implementing-zero-trust-with-hashicorp-boundary
description	Implement HashiCorp Boundary for identity-aware zero trust infrastructure access management with dynamic credential brokering, session recording, and Vault integration.
domain	cybersecurity
subdomain	zero-trust-architecture
tags	["zero-trust","hashicorp","boundary","privileged-access","vault","identity-aware-proxy","session-recording","just-in-time-access"]
version	1.0
author	mahipal
license	Apache-2.0
nist_csf	["PR.AA-01","PR.AA-05","PR.IR-01","GV.PO-01"]

Implementing Zero Trust with HashiCorp Boundary

Overview

HashiCorp Boundary is an identity-aware proxy that provides secure, zero trust access to infrastructure resources without traditional VPNs or direct network access. Boundary operates on a default-deny model -- users start with no access and must be explicitly granted permissions for specific resources. When integrated with HashiCorp Vault, Boundary can dynamically broker credentials, ensuring users never see or manage underlying secrets. This eliminates credential sprawl and enables just-in-time access with automatic credential revocation when sessions end. Boundary supports session recording for audit compliance, OIDC/LDAP authentication, and manages access through a hierarchical scope model of organizations and projects.

When to Use

• When deploying or configuring implementing zero trust with hashicorp boundary 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

Common Misconfigurations & Verification

Boundary only enforces zero trust if the target host cannot be reached except through a worker. Check for these:

• Target reachable directly. If users can SSH/RDP/connect to the host's real IP (10.0.x.x) over the network, Boundary's credential brokering and session recording are optional - lock host firewalls/security groups so only Boundary workers reach the target port.
• Wildcard grants. A role with ids=*;type=target;actions=authorize-session hands every user every target, defeating default-deny least privilege.
• Static long-lived credentials instead of Vault brokering, so secrets persist after the session and never rotate.
• Session recording enabled on the target but storage_bucket_id missing or unwritable, so nothing is actually captured.
• Static AEAD keys in the controller HCL rather than Vault Transit KMS.

How to confirm: from a user host, attempt to connect to the target's real IP/port directly (bypassing boundary connect) and confirm it is refused. Authorize a session as a low-privilege managed group and verify it can reach only its scoped target, not others. Start a session, then confirm a recording actually lands in the storage bucket and that brokered Vault credentials are revoked when the session ends.

Prerequisites

• HashiCorp Boundary server (self-hosted or HCP Boundary)
• HashiCorp Vault (for credential brokering)