AWS Vault: Complete Guide to Secure Credential Management

Introduction to AWS Vault

What is AWS Vault?

AWS Vault is an open-source tool for securely storing and accessing AWS credentials in development environments. It encrypts your long-term IAM credentials (Access Key and Secret Key) and generates short-term temporary credentials that can be safely exposed to your shell and applications.

Advantages Compared to Other Approaches

1. Enhanced Security Over Plain Text Storage – Traditional approaches store AWS credentials in plain text in ~/.aws/credentials or .env files – AWS Vault encrypts credentials using your operating system’s secure keystore (macOS Keychain, Windows Credential Manager, or Linux Secret Service) – Even if your filesystem is compromised, credentials remain encrypted

2. Temporary Credentials – AWS Vault uses AWS STS (Security Token Service) to generate temporary credentials that expire (default: 60 minutes) – If temporary credentials are stolen or leaked, the window of vulnerability is significantly reduced – Reduces risk from malicious dependencies or supply chain attacks

3. MFA Support – Built-in support for multi-factor authentication – Can enforce MFA requirements for role assumption – Adds an extra layer of security for sensitive operations

4. Prevents Accidental Credential Exposure – Significantly reduces the risk of committing credentials to version control (GitHub, Bitbucket, etc.) – Credentials never exist in plain text in your project files – Environment variables are injected only when needed

5. Multiple Backend Options – macOS Keychain – Windows Credential Manager – Secret Service (Gnome Keyring, KWallet) – KWallet – Pass – Passage (new in maintained fork) – Encrypted file – 1Password Connect (new in maintained fork) – 1Password Service Accounts (new in maintained fork) – 1Password Desktop App (new in maintained fork)

6. Seamless Integration – Works transparently with AWS CLI and SDKs – No code changes required in your applications – Aware of AWS CLI configuration in ~/.aws/config

7. Local Metadata Server – Can start a local EC2 metadata server for automatic credential rotation – Applications using AWS SDKs automatically refresh credentials – Mimics the EC2 instance metadata experience

Is AWS Vault Suitable for Production or Only Development?

AWS Vault is PRIMARILY designed for development environments. Here’s why:

Development/Local Use ✅ – Perfect for developer machines – Ideal for local testing and development – Great for workstations and laptops – Suitable for interactive environments

Production Use ❌ (Not Recommended)

AWS Vault is NOT suitable for production for several reasons:

1. Interactive Authentication Required
2. OS keychains typically require password prompts
3. Not suitable for automated/headless environments

4. Cannot run in containerized production workloads

5. Designed for Human Users

6. Expects interactive shell sessions

7. Not optimized for service-to-service authentication

8. Better Alternatives for Production

9. EC2 Instance Profiles/IAM Roles: For EC2 instances
10. ECS Task Roles: For containerized workloads
11. EKS Service Accounts (IRSA): For Kubernetes pods
12. AWS Secrets Manager: For application secrets
13. AWS Systems Manager Parameter Store: For configuration
14. Dedicated Secrets Management: Tools like Doppler, HashiCorp Vault

Limitations of AWS Vault

1. Scope Limitations – AWS Only: Doesn’t help with credentials for other cloud providers (Azure, GCP) – IAM Credentials Only: Doesn’t manage database credentials, API keys, or other secrets – Development Focus: Not designed for staging/production environments

2. Manual Credential Management – No Automatic Rotation: Leaves rotation of long-lived credentials to developers – No Lifecycle Management: Doesn’t handle credential creation, expiry policies – Manual Initial Setup: Developers must manually add credentials

3. Access Control and Auditing – Limited Access Control: Relies on OS-level permissions and AWS IAM – Complex IAM Setup: AWS IAM best practices involve 15+ items to configure correctly – Auditing Complexity: Using AWS CloudTrail for audit logging adds complexity and cost

4. Multiple Secrets Types – Most applications need various secrets beyond AWS credentials – Requires additional tools for comprehensive secrets management

5. Single Cloud Provider – Modern applications often use multiple cloud providers – Need separate solutions for non-AWS credentials

6. Developer Responsibility – Security depends on developers following best practices – Each developer must properly configure and maintain their setup – No centralized control for enterprise environments

2. Step-by-Step Guide to Using AWS Vault

Prerequisites

Before starting, ensure you have: – An AWS account with IAM user credentials – Administrative privileges on your local machine – Basic familiarity with command-line interfaces

Installation Guide

macOS Installation

Option 1: Homebrew (Recommended)

brew install aws-vault

Option 2: MacPorts

sudo port install aws-vault

Verify Installation:

aws-vault --version

Note: Homebrew will install from the maintained ByteNess fork when using the official formula.

Windows Installation

Option 1: Chocolatey

choco install aws-vault

Note: The Chocolatey package is maintained by Gusztáv Varga and uses the ByteNess fork.

Option 2: Scoop

scoop install aws-vault

Option 3: Direct Download Download the latest release from https://github.com/ByteNess/aws-vault/releases

Verify Installation:

aws-vault --version

Linux Installation

Option 1: Homebrew on Linux

brew install aws-vault

Option 2: Direct Download (Ubuntu/Debian)

# Download the binary from the maintained fork
sudo curl -L -o /usr/local/bin/aws-vault \
  https://github.com/ByteNess/aws-vault/releases/latest/download/aws-vault-linux-amd64
# Make it executable
sudo chmod 755 /usr/local/bin/aws-vault
# Verify installation
aws-vault --version

Option 3: NixOS

# Currently available on unstable channel
nix-env -iA nixos.aws-vault

Note: Package managers may still point to the old 99designs repository. Check your version after installation and download from ByteNess if needed.

Getting Your AWS IAM Credentials

Step 1: Access AWS Console 1. Log into the AWS Management Console 2. Click on your username in the top-right corner 3. Select Security Credentials

Step 2: Create Access Key 1. Scroll to the Access Keys section 2. Click Create Access Key 3. Select use case (choose “Other” for local development) 4. Click Next 5. Add a description tag (e.g., “aws-vault-dev-machine”) 6. Click Create Access Key

Step 3: Save Credentials Securely – Copy both the Access Key ID and Secret Access Key – Store them temporarily in a secure location (you’ll add them to AWS Vault next) – Warning: This is the only time you’ll see the secret key. If lost, you’ll need to create a new one.

Configuring AWS Vault

macOS Configuration

Step 1: Configure Backend (Default: Keychain) macOS uses Keychain by default. No additional configuration needed.

Step 2: Add Your First Profile

aws-vault add myprofile

New in v7.3+: The maintained fork now prompts for MFA device ARN:

Enter Access Key ID: AKIAIOSFODNN7EXAMPLE
Enter Secret Access Key: ****************************************
Enter MFA Device ARN (If MFA is not enabled, leave this blank): arn:aws:iam::123456789012:mfa/username
Added credentials to profile "myprofile" in vault

Step 3: Configure AWS Region

aws configure set region us-east-1 --profile myprofile

Step 4: Test Configuration

aws-vault exec myprofile -- aws sts get-caller-identity

Expected Output:

{
    "UserId": "AIDAI23HXK2XEXAMPLE",
    "Account": "123456789012",
    "Arn": "arn:aws:iam::123456789012:user/username"
}

Optional: Code Signing (for development) If you compile AWS Vault yourself, sign it to avoid Keychain prompts:

1. Open Keychain Access
2. Go to Certificate Assistant > Create Certificate
3. Choose Code Signing as certificate type
4. Sign the binary:

go build .
codesign --sign "Certificate Name" ./aws-vault

Windows Configuration

Step 1: Configure Backend (Default: Credential Manager) Windows uses Credential Manager by default. No additional configuration needed.

Step 2: Add Your First Profile

aws-vault add myprofile

Enter credentials when prompted.

Step 3: Configure AWS Region

aws configure set region us-east-1 --profile myprofile

Step 4: Test Configuration

aws-vault exec myprofile -- aws sts get-caller-identity

Troubleshooting Windows: If you encounter issues: – Ensure you have the latest version from ByteNess fork – Check that Windows Credential Manager service is running – Run PowerShell or Command Prompt as Administrator if needed

Linux Configuration

Step 1: Choose and Configure Backend

Linux doesn’t have a default keychain, so you need to configure a backend.

Option A: File Backend (Simplest)

# Temporary (current session only)
export AWS_VAULT_BACKEND=file
# Permanent (add to ~/.bashrc or ~/.bash_profile)
echo 'export AWS_VAULT_BACKEND=file' >> ~/.bashrc
source ~/.bashrc

Option B: Secret Service (GNOME Keyring/KWallet)

# Install required packages
# For Ubuntu/Debian:
sudo apt-get install gnome-keyring libsecret-1-0
# For Fedora:
sudo dnf install gnome-keyring libsecret
# Configure backend
export AWS_VAULT_BACKEND=secret-service

Option C: Pass (Password Store)

# Install Pass
sudo apt-get install pass  # Ubuntu/Debian
sudo dnf install pass       # Fedora
# Initialize Pass
gpg --gen-key  # If you don't have a GPG key
pass init your-gpg-key-id
# Configure backend
export AWS_VAULT_BACKEND=pass

Option D: Passage (New in Maintained Fork)

# Install Passage first
# Then configure:
export AWS_VAULT_BACKEND=passage

Option E: 1Password (New in Maintained Fork)

# Option 1: 1Password Connect
export AWS_VAULT_BACKEND=1password
# Option 2: 1Password Service Accounts
export AWS_VAULT_BACKEND=1password-sa
# Option 3: 1Password Desktop App
export AWS_VAULT_BACKEND=1password-desktop

Step 2: Add Your First Profile

aws-vault add myprofile

Enter your credentials when prompted.

Step 3: Configure AWS Region

aws configure set region us-east-1 --profile myprofile

Step 4: Test Configuration

aws-vault exec myprofile -- aws sts get-caller-identity

Advanced Configuration: Roles and MFA

Setting Up AWS IAM Roles with MFA

Step 1: Configure IAM (in AWS Console)

1. Create an IAM user with long-term credentials
2. Set up an MFA device for the user
3. Create IAM roles with appropriate permissions
4. Configure trust relationships to allow role assumption

Step 2: Configure AWS Config File

Edit ~/.aws/config:

[default]
region = us-east-1
# Base profile with MFA
[profile johnsmith]
mfa_serial = arn:aws:iam::111111111111:mfa/johnsmith
# Read-only role (no MFA required for this role)
[profile prod-readonly]
source_profile = johnsmith
role_arn = arn:aws:iam::222222222222:role/ReadOnly
# Admin role (MFA required)
[profile prod-admin]
source_profile = johnsmith
role_arn = arn:aws:iam::222222222222:role/Administrator
mfa_serial = arn:aws:iam::111111111111:mfa/johnsmith
# Role chaining example
[profile dev-role1]
source_profile = johnsmith
role_arn = arn:aws:iam::333333333333:role/Role1
mfa_serial = arn:aws:iam::111111111111:mfa/johnsmith
[profile dev-role2]
source_profile = dev-role1
role_arn = arn:aws:iam::333333333333:role/Role2

Step 3: Add Base Credentials

aws-vault add johnsmith

Step 4: Test MFA-Protected Profile

aws-vault exec prod-admin -- aws s3 ls

You’ll be prompted to enter your MFA token:

Enter token for arn:aws:iam::111111111111:mfa/johnsmith: 123456

Understanding Credential Types

Common Usage Patterns

Pattern 1: Execute Single Command

aws-vault exec myprofile -- aws s3 ls
aws-vault exec myprofile -- terraform apply
aws-vault exec myprofile -- npm start

Pattern 2: Start Interactive Shell

aws-vault exec myprofile
# Now in a subshell with credentials
$ aws s3 ls
$ terraform plan
$ exit  # Exit the subshell when done

Pattern 3: Login to AWS Console (NEW: Auto-logout Feature)

# Basic login
aws-vault login myprofile
# New in v7.3+: Auto-logout before login
aws-vault login myprofile --auto-logout
# or
aws-vault login myprofile -a

This automatically logs out any existing session before logging in with the new profile.

Pattern 4: Use Local Metadata Server

aws-vault exec --server myprofile -- node app.js

This starts a local metadata server that automatically rotates credentials, similar to EC2 instance metadata.

Pattern 5: Export Credentials as Environment Variables

# For use in current shell (not recommended - reduces security)
eval $(aws-vault exec myprofile --json | jq -r 'to_entries[] | "export \(.key)=\(.value)"')

Pattern 6: Specify Custom Session Duration

# Default is 1 hour, max depends on role configuration
aws-vault exec myprofile --duration=2h -- aws s3 ls

Managing AWS Vault

List Profiles and Sessions

# List all profiles
aws-vault list
# Example output:
# Profile                  Credentials              Sessions
# =======                  ===========              ========
# myprofile                myprofile                -
# prod-admin               myprofile                1h23m

Remove Cached Sessions

# Remove specific session
aws-vault remove myprofile --sessions-only
# Remove all sessions
aws-vault remove --sessions-only

Delete Profile

# Remove profile and credentials
aws-vault remove myprofile

Rotate Credentials

# Rotate access keys
aws-vault rotate myprofile

This creates a new access key, updates the profile, and deletes the old key.

Environment Variables Reference

Backend Configuration

export AWS_VAULT_BACKEND=keychain         # macOS Keychain
export AWS_VAULT_BACKEND=wincredential    # Windows Credential Manager
export AWS_VAULT_BACKEND=secret-service   # Linux Secret Service
export AWS_VAULT_BACKEND=kwallet          # KDE Wallet
export AWS_VAULT_BACKEND=pass             # Pass
export AWS_VAULT_BACKEND=passage          # Passage (new)
export AWS_VAULT_BACKEND=file             # Encrypted file
export AWS_VAULT_BACKEND=1password        # 1Password Connect (new)
export AWS_VAULT_BACKEND=1password-sa     # 1Password Service Accounts (new)
export AWS_VAULT_BACKEND=1password-desktop # 1Password Desktop App (new)

File Backend Configuration

export AWS_VAULT_FILE_DIR=~/.awsvault/keys/  # Custom file location
export AWS_VAULT_FILE_PASSPHRASE=mypassword  # Set passphrase (not recommended)

Prompt Configuration

export AWS_VAULT_PROMPT=terminal     # Prompt for MFA in terminal
export AWS_VAULT_PROMPT=osascript    # macOS GUI prompt
export AWS_VAULT_PROMPT=kdialog      # KDE GUI prompt
export AWS_VAULT_PROMPT=zenity       # GNOME GUI prompt

Server Configuration

export AWS_VAULT_SERVER_DISABLED=true  # Disable metadata server option

Troubleshooting Common Issues

Issue 1: “aws-vault: error: exec: Failed to get credentials”

Solution:

# Clear cached sessions
aws-vault remove --sessions-only
# Try again
aws-vault exec myprofile -- aws sts get-caller-identity

Issue 2: MFA Prompt Not Appearing

Solution:

# Force terminal prompt
export AWS_VAULT_PROMPT=terminal
aws-vault exec myprofile -- aws s3 ls

Issue 3: “NoCredentialProviders” Error

Solution: Check that credentials are properly stored:

aws-vault list

If profile is missing, re-add it:

aws-vault add myprofile

Issue 4: macOS Keychain Access Prompts

Solution: Click “Always Allow” when prompted, or sign the binary (see macOS Configuration section).

Issue 5: Linux Backend Not Working

Solution:

# Check if secret service is running
ps aux | grep gnome-keyring
# If not, use file backend instead
export AWS_VAULT_BACKEND=file
echo 'export AWS_VAULT_BACKEND=file' >> ~/.bashrc

Issue 6: Expired Session Errors

Solution:

# Remove expired sessions
aws-vault remove myprofile --sessions-only
# Re-authenticate
aws-vault exec myprofile -- aws s3 ls

Issue 7: Using Old Abandoned Version

Solution:

# Check your version
aws-vault --version
# If showing v7.2.0 or older (March 2023 or earlier), upgrade to ByteNess fork
# Reinstall from: https://github.com/ByteNess/aws-vault/releases

Best Practices

1. Use the Maintained Fork: Always install from https://github.com/ByteNess/aws-vault for latest updates and security patches
2. Use MFA for Production Roles: Always configure MFA for roles with elevated permissions
3. Minimize Session Duration: Use shorter durations for sensitive operations
4. Regular Credential Rotation: Rotate access keys every 90 days using aws-vault rotate
5. Separate Profiles: Create separate profiles for different environments (dev, staging, prod)
6. Use Roles Over Users: Assume roles rather than using user credentials directly
7. Clear Sessions Regularly: Remove cached sessions when switching contexts
8. Secure Your Keychain: Use a strong password for your OS keychain/credential manager
9. Audit Access: Regularly review AWS CloudTrail logs for your activities
10. Limit Profile Scope: Create profiles with minimal necessary permissions
11. Document Your Setup: Keep notes on profile configurations for team consistency
12. Use Auto-logout: Leverage the --auto-logout flag when switching between console sessions

Security Considerations

1. Physical Security: AWS Vault is only as secure as your machine – use disk encryption
2. OS Updates: Keep your operating system and AWS Vault updated
3. Network Security: Use VPN when accessing AWS from public networks
4. Backup Strategy: Document how to recreate profiles (don’t backup encrypted credentials)
5. Revoke Compromised Keys: Immediately delete and rotate any potentially compromised credentials
6. Monitor Usage: Set up AWS billing alerts and CloudTrail notifications
7. Principle of Least Privilege: Only grant permissions that are absolutely necessary
8. Session Management: Always clear sessions before lending or sharing your device
9. Version Control: Never commit AWS Vault configuration files containing sensitive data
10. Stay Updated: Monitor the ByteNess fork for security updates and new releases

Conclusion

AWS Vault is an excellent tool for securing AWS credentials in development environments, and it’s important to use the actively maintained ByteNess fork rather than the abandoned 99designs version. The maintained fork provides ongoing security updates, bug fixes, and new features like 1Password integration.

Remember: – ✅ Use AWS Vault (ByteNess fork) for: Local development, testing, and personal AWS access – ❌ Don’t use AWS Vault for: Production workloads, CI/CD pipelines, or automated systems

For production environments, use native AWS services like IAM Roles, ECS Task Roles, or dedicated secrets management solutions like AWS Secrets Manager or third-party tools like Doppler or HashiCorp Vault.

By following this guide and best practices, you’ll have a secure, maintainable credential management setup for your development workflow.

Additional Resources: – AWS Vault (ByteNess – Maintained Fork) ⭐ Use this! – AWS Vault (99designs – Abandoned) ⚠️ Do not use – AWS IAM Best Practices – AWS STS Documentation – Doppler Secrets Management – HashiCorp Vault – Alternative: Granted – Another credential management tool