implementing-hashicorp-vault-dynamic-secrets

Implements HashiCorp Vault dynamic secrets engines for database credentials, AWS IAM keys, and PKI certificates with automatic generation, lease management, and credential rotation to eliminate static secrets in application configurations. Activates for requests involving Vault secrets engine configuration, dynamic database credentials, ephemeral cloud credentials, or automated secret rotation.

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name	implementing-hashicorp-vault-dynamic-secrets
description	Implements HashiCorp Vault dynamic secrets engines for database credentials, AWS IAM keys, and PKI certificates with automatic generation, lease management, and credential rotation to eliminate static secrets in application configurations. Activates for requests involving Vault secrets engine configuration, dynamic database credentials, ephemeral cloud credentials, or automated secret rotation.
domain	cybersecurity
subdomain	identity-access-management
tags	["HashiCorp-Vault","dynamic-secrets","secrets-management","database-credentials","AWS-secrets","PKI"]
version	1.0
author	mahipal
license	Apache-2.0

Implementing HashiCorp Vault Dynamic Secrets

When to Use

Applications use static database credentials stored in configuration files or environment variables
AWS IAM access keys are long-lived and shared across services
Need to eliminate credential sprawl by generating short-lived, per-request secrets
Compliance requirements mandate credential rotation (PCI-DSS Requirement 8, NIST 800-53 IA-5)
Implementing zero-trust secret management where credentials are never stored at rest
Migrating from manual credential management to automated secrets lifecycle

Do not use for storing static secrets that cannot be dynamically generated (use Vault's KV secrets engine instead); dynamic secrets are for credentials that can be programmatically created and revoked on target systems.

Prerequisites

HashiCorp Vault 1.15+ (Community or Enterprise edition)
Vault server initialized and unsealed with auto-unseal configured (AWS KMS, Azure Key Vault, or Transit)
Target database systems with admin credentials for Vault to create/revoke dynamic accounts
AWS IAM account with permissions to create/delete IAM users and access keys
Network connectivity from Vault to all target systems
Vault policies and authentication methods configured for consuming applications

Workflow

Step 1: Deploy and Configure Vault Server

Initialize Vault with production-grade configuration:

# vault-config.hcl - Production Vault server configuration
storage "raft" {
  path    = "/opt/vault/data"
  node_id = "vault-1"

  retry_join {
    leader_api_addr = "https://vault-2.corp.local:8200"
  }
  retry_join {
    leader_api_addr = "https://vault-3.corp.local:8200"
  }
}

listener "tcp" {
  address       = "0.0.0.0:8200"
  tls_cert_file = "/opt/vault/tls/vault-cert.pem"
  tls_key_file  = "/opt/vault/tls/vault-key.pem"
}

seal "awskms" {
  region     = "us-east-1"
  kms_key_id = "alias/vault-unseal-key"
}

api_addr      = "https://vault-1.corp.local:8200"
cluster_addr  = "https://vault-1.corp.local:8201"

telemetry {
  prometheus_retention_time = "24h"
  disable_hostname          = true
}

ui = true

# Initialize Vault cluster
vault operator init -key-shares=5 -key-threshold=3

# Enable audit logging
vault audit enable file file_path=/var/log/vault/audit.log

# Enable AppRole authentication for applications
vault auth enable approle

# Create policy for database secret consumers
vault policy write db-consumer - <<


vault write auth/approle/role/webapp \
    token_policies= \
    token_ttl=1h \
    token_max_ttl=4h \
    secret_id_ttl=720h \
    secret_id_num_uses=0

# Enable the database secrets engine
vault secrets enable database

# Configure PostgreSQL connection
vault write database/config/production-postgres \
    plugin_name=postgresql-database-plugin \
    allowed_roles="app-readonly,app-readwrite,app-admin" \
    connection_url="postgresql://{{username}}:{{password}}@db-primary.corp.local:5432/appdb?sslmode=verify-full" \
    username="vault_admin" \
    password="$VAULT_DB_PASSWORD" \
    password_authentication="scram-sha-256"

# Rotate the root credentials so Vault manages them exclusively
vault write -force database/rotate-root/production-postgres

# Create read-only role (TTL: 1 hour, max 24 hours)
vault write database/roles/app-readonly \
    db_name=production-postgres \
    creation_statements="CREATE ROLE \"{{name}}\" WITH LOGIN PASSWORD '{{password}}' VALID UNTIL '{{expiration}}'; \
        GRANT SELECT ON ALL TABLES IN SCHEMA public TO \"{{name}}\"; \
        ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO \"{{name}}\";" \
    revocation_statements="REVOKE ALL PRIVILEGES ON ALL TABLES IN SCHEMA public FROM \"{{name}}\"; \
        DROP ROLE IF EXISTS \"{{name}}\";" \
    default_ttl="1h" \
    max_ttl="24h"

# Create read-write role (TTL: 30 minutes, max 8 hours)
vault write database/roles/app-readwrite \
    db_name=production-postgres \
    creation_statements="CREATE ROLE \"{{name}}\" WITH LOGIN PASSWORD '{{password}}' VALID UNTIL '{{expiration}}'; \
        GRANT SELECT, INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA public TO \"{{name}}\"; \
        ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT, INSERT, UPDATE, DELETE ON TABLES TO \"{{name}}\";" \
    revocation_statements="REVOKE ALL PRIVILEGES ON ALL TABLES IN SCHEMA public FROM \"{{name}}\"; \
        DROP ROLE IF EXISTS \"{{name}}\";" \
    default_ttl="30m" \
    max_ttl="8h"

# Configure MySQL connection
vault write database/config/production-mysql \
    plugin_name=mysql-database-plugin \
    allowed_roles="mysql-readonly,mysql-readwrite" \
    connection_url="{{username}}:{{password}}@tcp(mysql-primary.corp.local:3306)/" \
    username="vault_admin" \
    password="$VAULT_MYSQL_PASSWORD"

vault write database/roles/mysql-readonly \
    db_name=production-mysql \
    creation_statements="CREATE USER '{{name}}'@'%' IDENTIFIED BY '{{password}}'; \
        GRANT SELECT ON appdb.* TO '{{name}}'@'%';" \
    revocation_statements="DROP USER IF EXISTS '{{name}}'@'%';" \
    default_ttl="1h" \
    max_ttl="24h"

# Test dynamic credential generation
echo "Testing PostgreSQL dynamic credentials:"
vault read database/creds/app-readonly
# Returns: username=v-approle-app-read-xxxxx, password=<random>, lease_id=database/creds/app-readonly/xxxxx

# Enable the AWS secrets engine
vault secrets enable aws

# Configure the AWS secrets engine with root credentials
vault write aws/config/root \
    access_key="$AWS_ACCESS_KEY_ID" \
    secret_key="$AWS_SECRET_ACCESS_KEY" \
    region="us-east-1"

# Configure lease settings
vault write aws/config/lease \
    lease="30m" \
    lease_max="1h"

# Create IAM User role for S3 read-only access
vault write aws/roles/s3-readonly \
    credential_type=iam_user \
    policy_document=-<<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:ListBucket",
        "s3:GetBucketLocation"
      ],
      "Resource": [
        "arn:aws:s3:::app-data-bucket",
        "arn:aws:s3:::app-data-bucket/*"
      ]
    }
  ]
}
EOF

# Create Assumed Role for EC2 management (preferred over IAM users)
vault write aws/roles/ec2-admin \
    credential_type=assumed_role \
    role_arns="arn:aws:iam::123456789012:role/VaultEC2AdminRole" \
    default_sts_ttl="30m" \
    max_sts_ttl="1h"

# Create Federation Token role for cross-account access
vault write aws/roles/cross-account-readonly \
    credential_type=federation_token \
    policy_document=-<<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "sts:AssumeRole"
      ],
      "Resource": "arn:aws:iam::987654321098:role/CrossAccountReadOnly"
    }
  ]
}
EOF

# Test AWS dynamic credentials
echo "Testing AWS STS credentials:"
vault read aws/creds/ec2-admin
# Returns: access_key, secret_key, security_token with 30-minute TTL

# Enable PKI secrets engine for root CA
vault secrets enable -path=pki pki
vault secrets tune -max-lease-ttl=87600h pki

# Generate root CA certificate
vault write pki/root/generate/internal \
    common_name="Corp Internal Root CA" \
    ttl=87600h \
    key_type=ec \
    key_bits=384

# Enable PKI for intermediate CA
vault secrets enable -path=pki_int pki
vault secrets tune -max-lease-ttl=43800h pki_int

# Generate intermediate CA CSR
vault write pki_int/intermediate/generate/internal \
    common_name="Corp Intermediate CA" \
    key_type=ec \
    key_bits=256

# Sign intermediate CA with root CA
vault write pki/root/sign-intermediate \
    csr=@intermediate.csr \
    format=pem_bundle \
    ttl=43800h

# Configure issuing URLs
vault write pki_int/config/urls \
    issuing_certificates="https://vault.corp.local:8200/v1/pki_int/ca" \
    crl_distribution_points="https://vault.corp.local:8200/v1/pki_int/crl"

# Create role for web server certificates (TTL: 30 days)
vault write pki_int/roles/web-server \
    allowed_domains="corp.local,internal.corp.com" \
    allow_subdomains=true \
    max_ttl=720h \
    key_type=ec \
    key_bits=256 \
    require_cn=true \
    enforce_hostnames=true

# Create role for service mesh certificates (TTL: 24 hours)
vault write pki_int/roles/service-mesh \
    allowed_domains="service.consul" \
    allow_subdomains=true \
    max_ttl=24h \
    key_type=ec \
    key_bits=256 \
    allow_ip_sans=true \
    server_flag=true \
    client_flag=true

# Issue a certificate
vault write pki_int/issue/web-server \
    common_name="api.corp.local" \
    alt_names="api.internal.corp.com" \
    ttl=720h

"""
Application integration with HashiCorp Vault for dynamic database credentials.
Uses the hvac Python client with automatic lease renewal.
"""
import hvac
import threading
import time
import logging

class VaultDynamicCredentialManager:
    def __init__(self, vault_addr, role_id, secret_id):
        self.client = hvac.Client(url=vault_addr)
        self.role_id = role_id
        self.secret_id = secret_id
        self.logger = logging.getLogger("vault_credentials")
        self._current_creds = None
        self._lease_id = None
        self._renewal_thread = None
        self._stop_event = threading.Event()

    def authenticate(self):
        """Authenticate to Vault using AppRole."""
        response = self.client.auth.approle.login(
            role_id=self.role_id,
            secret_id=self.secret_id
        )
        self.client.token = response["auth"]["client_token"]
        self.logger.info("Authenticated to Vault via AppRole")

    def get_database_credentials(self, role="app-readonly"):
        """Request dynamic database credentials from Vault."""
        self.authenticate()

        response = self.client.secrets.database.generate_credentials(
            name=role
        )

        self._current_creds = {
            "username": response["data"]["username"],
            "password": response["data"]["password"],
        }
        self._lease_id = response["lease_id"]
        lease_duration = response["lease_duration"]

        self.logger.info(
            f"Obtained dynamic credentials: user={self._current_creds['username']}, "
            f"lease={self._lease_id}, ttl={lease_duration}s"
        )

        # Start background lease renewal
        self._start_renewal(lease_duration)

        return self._current_creds

    def _start_renewal(self, lease_duration):
        """Start background thread to renew lease before expiration."""
        if self._renewal_thread and self._renewal_thread.is_alive():
            self._stop_event.set()
            self._renewal_thread.join()

        self._stop_event.clear()
        renewal_interval = lease_duration * 0.7  # Renew at 70% of TTL

        def renew_loop():
            while not self._stop_event.wait(renewal_interval):
                try:
                    self.client.sys.renew_lease(
                        lease_id=self._lease_id,
                        increment=lease_duration
                    )
                    self.logger.info(f"Renewed lease: {self._lease_id}")
                except hvac.exceptions.InvalidRequest:
                    self.logger.warning("Lease expired, obtaining new credentials")
                    self.get_database_credentials()
                    break
                except Exception as e:
                    self.logger.error(f"Lease renewal failed: {e}")

        self._renewal_thread = threading.Thread(target=renew_loop, daemon=True)
        self._renewal_thread.start()

    def revoke_credentials(self):
        """Explicitly revoke current dynamic credentials."""
        if self._lease_id:
            self._stop_event.set()
            self.client.sys.revoke_lease(self._lease_id)
            self.logger.info(f"Revoked lease: {self._lease_id}")
            self._current_creds = None
            self._lease_id = None

    def get_aws_credentials(self, role="s3-readonly"):
        """Request dynamic AWS credentials from Vault."""
        self.authenticate()

        response = self.client.secrets.aws.generate_credentials(
            name=role
        )

        return {
            "access_key": response["data"]["access_key"],
            "secret_key": response["data"]["secret_key"],
            "security_token": response["data"].get("security_token"),
            "lease_id": response["lease_id"],
            "ttl": response["lease_duration"]
        }

# Usage example
vault_mgr = VaultDynamicCredentialManager(
    vault_addr="https://vault.corp.local:8200",
    role_id="<approle-role-id>",
    secret_id="<approle-secret-id>"
)

db_creds = vault_mgr.get_database_credentials("app-readonly")
# Use db_creds["username"] and db_creds["password"] for database connection

# Monitor active leases
vault list sys/leases/lookup/database/creds/app-readonly
vault list sys/leases/lookup/aws/creds/s3-readonly

# Check lease details
vault write sys/leases/lookup lease_id="database/creds/app-readonly/abcd1234"

# Revoke all leases for a specific path (emergency credential rotation)
vault lease revoke -prefix database/creds/app-readonly

# Vault metrics for monitoring (Prometheus format)
# Key metrics to monitor:
# vault.expire.num_leases - Total active leases
# vault.expire.revoke - Lease revocations per second
# vault.secret.kv.count - Total stored secrets
# vault.runtime.alloc_bytes - Memory allocation

# Configure Vault audit log analysis
cat > vault_audit_monitor.sh << 'SCRIPT'
#!/bin/bash
# Monitor Vault audit logs for suspicious activity

AUDIT_LOG="/var/log/vault/audit.log"

# Count credential requests per hour
echo "=== Dynamic Credential Requests (Last Hour) ==="
jq -r 'select(.type == "response" and .request.path | startswith("database/creds/")) |
    "\(.time) \(.request.path) \(.auth.display_name)"' \
    "$AUDIT_LOG" | tail -100

# Detect unusual credential request patterns
echo ""
echo "=== High-Volume Credential Consumers ==="
jq -r 'select(.type == "request" and .request.path | startswith("database/creds/")) |
    .auth.display_name' \
    "$AUDIT_LOG" | sort | uniq -c | sort -rn | head -10

# Check for failed authentication attempts
echo ""
echo "=== Failed Auth Attempts ==="
jq -r 'select(.type == "response" and .error != null and
    .request.path | startswith("auth/")) |
    "\(.time) \(.request.path) \(.error)"' \
    "$AUDIT_LOG" | tail -20
SCRIPT
chmod +x vault_audit_monitor.sh

Term	Definition
Dynamic Secrets	Credentials generated on-demand by Vault with automatic expiration, ensuring each consumer receives unique short-lived credentials
Lease	Time-bound agreement where Vault guarantees the credential is valid; consumers must renew before expiration or request new credentials
Secrets Engine	Vault plugin that generates, stores, or encrypts data; database, AWS, PKI, and KV are common engines
AppRole	Vault authentication method designed for machine-to-machine authentication using role ID and secret ID pairs
Root Credential Rotation	Process of having Vault take exclusive ownership of the admin credential used to create dynamic secrets, eliminating human knowledge of the root password
Lease Revocation	Immediate invalidation of dynamic credentials, used during incident response to revoke all credentials for compromised paths

HASHICORP VAULT DYNAMIC SECRETS REPORT
=========================================
Vault Version:     1.16.2 Enterprise
Cluster Status:    HA Active (3 nodes)
Seal Type:         AWS KMS (auto-unseal)

SECRETS ENGINES
database/:         PostgreSQL, MySQL (2 connections)
aws/:              IAM User, Assumed Role, Federation Token
pki_int/:          Internal CA (EC P-256)

DYNAMIC CREDENTIAL METRICS (Last 24 Hours)
Total Credentials Generated:    4,287
  Database (PostgreSQL):        2,891
  Database (MySQL):             543
  AWS STS:                      612
  PKI Certificates:             241

ACTIVE LEASES
Total Active:                   387
  database/creds/app-readonly:  198
  database/creds/app-readwrite: 89
  aws/creds/s3-readonly:        67
  pki_int/issue/web-server:     33

LEASE LIFECYCLE
Average TTL:                    45 minutes
Renewals (24h):                 12,847
Revocations (24h):              3,901
Expired (not renewed):          12

SECURITY
Failed Auth Attempts (24h):     3
Root Credential Rotated:        YES (all databases)
Audit Logging:                  ENABLED (file + syslog)
Policy Violations (24h):        7 (permission denied)