aws-adfs

The project provides command line tool - aws-adfs to ease AWS cli authentication against ADFS (multi factor authentication with active directory).

aws-adfs command line tool

• allows you to re-login to STS without entering credentials for an extended period of time, without having to store the user's actual credentials. It also lets an organization control the period in which a user can re-login to STS without entering credentials, by altering the ADFS session lifetime.

• supports automation tools like ansible by providing security token in AWS_SESSION_TOKEN/AWS_SECURITY_TOKEN environment variables.

• supports using Security Support Provider Interface (SSPI) on Windows OS.

MFA integration

aws-adfs integrates with:

• duo security MFA provider with support for:
  • Duo mobile application push (verified by code or not) using the Duo Push authentication method.
  • Phone call using the Phone Call authentication method.
  • OTP 6 digit codes generated by Duo Mobile application, and hardware tokens (e.g. RSA or Yubikey) using the Passcode authentication method.
  • FIDO U2F (CTAP1) / FIDO2 (CTAP2) hardware authenticators using the WebAuthn Security Key authentication method.
• Symantec VIP MFA provider
• RSA SecurID MFA provider
• Azure AD MFA with support for:
  • Microsoft Authenticator app
  • OTP 6 digit codes
  • SMS codes
  • Phone call
• Silverfort MFA provider
• Thales/SafeNet Trusted Access MFA provider
  • OTP 6 digit codes generated by MobilePASS+ Authenticator app

Setup Dependencies

• build-essential (provides C/C++ compilers)
• python3 >= 3.7 <4.0
• python3-dev
• libkrb5-dev
• libxml2-dev

Installation

• user local installation with pipx

  pipx install aws-adfs
  

• user local installation with pip

  pip3 install --user aws-adfs
  

  Please note, that you need to add $HOME/.local/bin to your PATH

• system wide installation

  sudo pip3 install aws-adfs
  

• virtualenvs

  virtualenv aws-adfs
  source aws-adfs/bin/activate
  pip install aws-adfs
  ...
  ...
  deactivate
  

• Windows 10

  • Install latest supported Visual C++ downloads from Microsoft for Visual Studio 2015, 2017 and 2019:
    • https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads
    • https://aka.ms/vs/16/release/vc_redist.x64.exe
  • Install Python 3.7 from Microsoft Store:
    • https://www.microsoft.com/en-us/p/python-37/9nj46sx7x90p
  • Start PowerShell as Administrator
  • Go to C:\Program Files:

    C:
    cd 'C:\Program Files\'
    

  • Create virtual env:

    python3 -m venv aws-adfs
    

  • Install aws-adfs:

    & 'C:\Program Files\aws-adfs\Scripts\pip' install aws-adfs
    

  • Run it:

    & 'C:\Program Files\aws-adfs\Scripts\aws-adfs' login --adfs-host=your-adfs-hostname
    

Examples of usage

aws-adfs

• login to your adfs host with disabled ssl verification on aws cli profile: adfs

  aws-adfs login --adfs-host=your-adfs-hostname --no-ssl-verification
  

  and verification

  aws --profile=adfs s3 ls
  

• login to your adfs host with disabled ssl verification on specified aws cli profile: specified-profile

  aws-adfs login --profile=specified-profile --adfs-host=your-adfs-hostname --no-ssl-verification
  

  and verification

  aws --profile=specified-profile s3 ls
  

• login to your adfs host and fetch roles for AWS GovCloud (US)

  aws-adfs login --adfs-host=your-adfs-hostname --provider-id urn:amazon:webservices:govcloud --region us-gov-west-1
  

  and verification

  aws s3 ls
  

• login to your adfs host within ansible playbook

  ---
  - name: "Auth sts aws"
    command: "aws-adfs login --adfs-host sts.example.com --env --stdout --role-arn arn:aws:iam::000123456789:role/ADMIN"
    register: sts_result
    environment:
      - username: "{{ ansible_user }}@example.com"
      - password: "{{ ansible_ssh_pass }}"
  
  - name: "Set sts facts"
    set_fact:
      sts: "{{ sts_result.stdout | from_json }}"
  
  - name: "List s3 Buckets"
    aws_s3_bucket_facts:
      aws_access_key: "{{ sts.AccessKeyId }}"
      aws_secret_key: "{{ sts.SecretAccessKey }}"
      security_token: "{{ sts.SessionToken }}"
      region: "us-east-1"
    register: buckets
  
  - name: "Print Buckets"
    debug:
      var: buckets
  

• login to your adfs host by passing username and password credentials via a file

  aws-adfs login --adfs-host=your-adfs-hostname --authfile=/path/and/file/name
  

  Auth file should be in format of

  [profile_name]
  username = your_username
  password = your_password
  

• .aws/config profile for automatically refreshing credentials

  [profile example-role-ue1]
  credential_process=aws-adfs login --region=us-east-1 --role-arn=arn:aws:iam::1234567891234:role/example-role --adfs-host=adfs.example.com --stdout
  

  Warning: see AWS documentation about security considerations to take when sourcing credentials with an external process.

• help, help, help?

  $ aws-adfs --help
  Usage: aws-adfs [OPTIONS] COMMAND [ARGS]...
  
  Options:
    --version      Show current tool version
    -v, --verbose  Enables debug information on stdout. By default log level is
                   set on ERROR
    --help         Show this message and exit.
  
  Commands:
    list   lists available profiles
    login  Authenticates an user with active directory credentials
    reset  removes stored profile
  

  $ aws-adfs list --help
  Usage: aws-adfs list [OPTIONS]
  
    lists available profiles
  
  Options:
    --help  Show this message and exit.
  

  $ aws-adfs login --help
  Usage: aws-adfs login [OPTIONS]
  
    Authenticates an user with active directory credentials
  
  Options:
    --profile TEXT                  AWS cli profile that will be authenticated.
                                    After successful authentication just use:
                                    aws --profile <authenticated profile>
                                    <service> ...
    --region TEXT                   The default AWS region that this script will
                                    connect to for all API calls
    --ssl-verification / --no-ssl-verification
                                    SSL certificate verification: Whether or not
                                    strict certificate verification is done,
                                    False should only be used for dev/test
    --adfs-ca-bundle TEXT           Override CA bundle for SSL certificate
                                    verification for ADFS server only.
    --adfs-host TEXT                For the first time for a profile it has to
                                    be provided, next time for the same profile
                                    it will be loaded from the stored
                                    configuration
    --output-format [json|text|table]
                                    Output format used by aws cli
    --provider-id TEXT              Provider ID, e.g urn:amazon:webservices
                                    (optional)
    --s3-signature-version [s3v4]   s3 signature version: Identifies the version
                                    of AWS Signature to support for
                                    authenticated requests. Valid values: s3v4
    --username-password-command TEXT
                                    Read username and password from the output
                                    of a shell command (expected JSON format:
                                    `{"username": "myusername", "password":
                                    "mypassword"}`)
    --mfa-token-command TEXT        Read MFA token for Symantec or RSA
                                    authenticators from the output of a shell
                                    command (expected JSON format:
                                    `{"mfa_token": "123654"}`)
    --env                           Read username, password and optionally an
                                    MFA token from environment variables
                                    (username, password and mfa_token).
    --stdin                         Read username, password from standard input
                                    separated by a newline.
    --authfile TEXT                 Read username, password from a local file
                                    (optional)
    --stdout                        Print aws_session_token in json on stdout.
    --printenv                      Output commands to set AWS_ACCESS_KEY_ID,
                                    AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN,
                                    AWS_DEFAULT_REGION environmental variables
                                    instead of saving them to the aws
                                    configuration file.
    --print-console-signin-url      Output a URL that lets users who sign in to
                                    your organization's network securely access
                                    the AWS Management Console.
    --console-role-arn TEXT         Role to assume for use in conjunction with
                                    --print-console-signin-url
    --console-external-id TEXT      External ID to pass in assume role for use
                                    in conjunction with --print-console-signin-
                                    url
    --role-arn TEXT                 Predefined role arn to selects, e.g. aws-
                                    adfs login --role-arn arn:aws:iam::123456789
                                    012:role/YourSpecialRole
    --session-duration INTEGER      Define the amount of seconds you want to
                                    establish your STS session, e.g. aws-adfs
                                    login --session-duration 3600
    --no-session-cache              Do not use AWS session cache in
                                    ~/.aws/adfs_cache/ directory.
    --assertfile TEXT               Use SAML assertion response from a local
                                    file
    --sspi / --no-sspi              Whether or not to use Kerberos SSO
                                    authentication via SSPI (Windows only,
                                    defaults to True).
    --duo-factor TEXT               Use a specific Duo factor, overriding the
                                    default one configured server side. Known
                                    Duo factors that can be used with aws-adfs
                                    are "Duo Push", "Passcode", "Phone Call" and
                                    "WebAuthn Security Key".
    --duo-device TEXT               Use a specific Duo device, overriding the
                                    default one configured server side. Depends
                                    heavily on the Duo factor used. Known Duo
                                    devices that can be used with aws-adfs are
                                    "phone1" for "Duo Push" and "Phone Call"
                                    factors. For "Passcode" and "WebAuthn
                                    Security Key" factors, it is always "None".
    --enforce-role-arn              Only allow the role passed in by --role-arn.
    --aad-verification-code TEXT    Verification code for Azure AD multi-factor
                                    authentication.
    --help                          Show this message and exit.
  

  $ aws-adfs reset --help
  Usage: aws-adfs reset [OPTIONS]
  
    removes stored profile
  
  Options:
    --profile TEXT  AWS cli profile that will be removed
    --help          Show this message and exit.
  

Known issues

• duo-security

  Error: Cannot begin authentication process. The error response: {"message": "Unknown authentication method.", "stat": "FAIL"}

  Please setup preferred auth method in duo-security settings (settings' -> 'My Settings & Devices').

• USB FIDO2 does not work in Windows Subsystem for Linux (WSL)

  OSError: [Errno 2] No such file or directory: '/sys/class/hidraw'

  USB devices are not accessible in WSL, please install and run aws-adfs on the Windows 10 host and then access the credentials in WSL from the filesystem. Example:

  export AWS_CONFIG_FILE=/mnt/c/Users/username/.aws/config
  export AWS_SHARED_CREDENTIALS_FILE=/mnt/c/Users/username/.aws/credentials
  

• FIDO2 devices are not detected on Windows 10 build 1903 or newer

  Running aws-adfs as Administrator is required since Windows 10 build 1903 to access FIDO2 devices, cf. Yubico/python-fido2#55)

• in cases of trouble with lxml please install

  sudo apt-get install python3-dev libxml2-dev libxslt1-dev zlib1g-dev
  

• in cases of trouble with pykerberos please install

  sudo apt-get install python3-dev libkrb5-dev
  

• in cases of trouble with OSX Sierra (obsolete OpenSSL), upgrade OpenSSL. Example:

  brew upgrade openssl
  

  AND add explicit directive to .bash_profile:

  export PATH=$(brew --prefix openssl)/bin:$PATH
  

• only python >= 3.7 to <4.0 are supported:

  • python 2.6 is not supported
  • python 2.7 is not supported
  • python 3.2 is not supported
  • python 3.3 is not supported
  • python 3.4 is not supported
  • python 3.5 is not supported
  • python 3.6 is not supported

Development

• update dependencies:

poetry update

• run unit tests:

poetry run pytest

• release:

export CHANGELOG_GITHUB_TOKEN=$(gopass show -o pins/Github/github-changelog-generator)
./scripts/release.sh patch # or minor, major, prepatch, preminor, premajor, prerelease, or a valid semver string

Changelog

See the CHANGELOG.md file, which is generated using github-changelog-generator.