Class: SimplyGenius::Atmos::Providers::Aws::AuthManager

Inherits:
Object
  • Object
show all
Includes:
FileUtils, GemLogger::LoggerSupport, UI
Defined in:
lib/simplygenius/atmos/providers/aws/auth_manager.rb

Instance Method Summary collapse

Methods included from UI

#agree, #ask, #choose, color_enabled, color_enabled=, #display, #error, #notify, #say, #warn

Constructor Details

#initialize(provider) ⇒ AuthManager

Returns a new instance of AuthManager.



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# File 'lib/simplygenius/atmos/providers/aws/auth_manager.rb', line 19

def initialize(provider)
  @provider = provider
end

Instance Method Details

#authenticate(system_env, **opts, &block) ⇒ Object 



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# File 'lib/simplygenius/atmos/providers/aws/auth_manager.rb', line 23

def authenticate(system_env, **opts, &block)

  profile = system_env['AWS_PROFILE']
  key = system_env['AWS_ACCESS_KEY_ID']
  secret = system_env['AWS_SECRET_ACCESS_KEY']
  # dont warn if default profile
  no_creds = ::Aws::SharedCredentials.new.credentials.nil? rescue true

  if profile.blank? && (key.blank? || secret.blank?) && no_creds
    logger.warn("No AWS credentials are active in the environment nor shared credential store")
    logger.warn("Run 'aws configure' to add some to the shared credential store")
  end
  if profile.present? && key.present?
    logger.warn("Ignoring AWS_PROFILE because AWS_ACCESS_KEY_ID is set in the environment")
  end

  if Atmos.config["auth.bypass"]
    logger.warn("Bypassing atmos aws authentication")
    return block.call(Hash[system_env])
  end

  # Handle bootstrapping a new env account.  Newly created organization
  # accounts only have the default role that can only be assumed by an
  # iam user, so use that as the target for assume_role, and the root
  # check below will ensure iam user
  assume_role_name = nil
  if opts[:bootstrap] && Atmos.config.atmos_env != 'ops'
    # TODO: do this hack better
    assume_role_name = Atmos.config["auth.bootstrap_assume_role_name"]
    @session_duration = 3600
  else
    assume_role_name = opts[:role] || Atmos.config["auth.assume_role_name"]
  end
   = Atmos.config.[Atmos.config.atmos_env].to_s
  role_arn = "arn:aws:iam::#{}:role/#{assume_role_name}"

  user_name = nil
  begin
    sts = ::Aws::STS::Client.new
    resp = sts.get_caller_identity
    arn_pieces = resp.arn.split(":")
    user_name = arn_pieces.last.split("/").last

    # root credentials can't assume role, but they should have full
    # access for the current account, so proceed (e.g. for bootstrap).
    if arn_pieces.last == "root"

      # We check the account of the caller to prevent root user of ops
      # account from bootstrapping an env account, but still allow a
      # root user of the env account itself to be able to bootstrap
      # (i.e. to allow not organizational accounts to bootstrap using
      # their root user)
      if arn_pieces[-2] != 
        logger.error <<~EOF
          Account doesn't match credentials.  Bootstrapping a new
          account should be done as an iam user from the ops account or
          using credentials for a root user of the env account.
        EOF
        exit(1)
      end

      # Should only use root credentials for  bootstrap, and thus we
      # won't have role requirement for mfa, etc, even if root account
      # uses mfa for login.  Thus skip all the other stuff, to
      # encourage/force use of non-root accounts for normal use
      logger.warn("Using aws root credentials - should only be neccessary for bootstrap")
      return block.call(Hash[system_env])
    end

  rescue ::Aws::STS::Errors::ServiceError => e
    logger.error "Could not discover aws credentials"
    exit(1)
  end

  auth_needed = true
  cache_key = "#{user_name}-#{assume_role_name}"
  credentials = read_auth_cache[cache_key]

  if credentials.present?
    logger.debug("Session cache present, checking expiration...")
    expiration = Time.parse(credentials['expiration'])
    session_renew_interval = (session_duration / 4).to_i

    if Time.now > expiration
      logger.debug "Session cache is expired, performing normal auth"
      auth_needed = true
    elsif Time.now > (expiration - session_renew_interval)
      begin
        # TODO: investigate making all info a warn so we don't pollute stdout for shell scripts
        logger.info "Session approaching expiration, renewing..."
        credentials = assume_role(role_arn, credentials: credentials, user_name: user_name)
        write_auth_cache(cache_key => credentials)
        auth_needed = false
      rescue => e
        logger.info "Failed to renew credentials using session cache, reason: #{e.message}"
        auth_needed = true
      end
    else
      logger.debug "Session cache is current, skipping auth"
      auth_needed = false
    end
  end

  if auth_needed
    begin
      logger.info "No active session cache, authenticating..."

      credentials = assume_role(role_arn, user_name: user_name)
      write_auth_cache(cache_key => credentials)

    rescue ::Aws::STS::Errors::AccessDenied => e
      if e.message !~ /explicit deny/
        logger.debug "Access Denied, reason: #{e.message}"
      end

      logger.info "Normal auth failed, checking for mfa"

      iam = ::Aws::IAM::Client.new
      response = iam.list_mfa_devices(user_name: user_name)
      mfa_serial = response.mfa_devices.first.try(:serial_number)
      token = nil
      if mfa_serial.present?

        token = Otp.instance.generate(user_name)
        if token.nil?
          token = ask("Enter token to retry with mfa: ")
        else
          logger.info "Used integrated atmos mfa to generate token"
        end

        if token.blank?
          logger.error "A MFA token must be supplied"
          exit(1)
        end

      else
        logger.error "MFA is not setup for your account, retry after doing so"
        exit(1)
      end

      credentials = assume_role(role_arn, serial_number: mfa_serial, token_code: token, user_name: user_name)
      write_auth_cache(cache_key => credentials)

    end
  end

  process_env = {}
  process_env['AWS_ACCESS_KEY_ID'] = credentials['access_key_id']
  process_env['AWS_SECRET_ACCESS_KEY'] = credentials['secret_access_key']
  process_env['AWS_SESSION_TOKEN'] = credentials['session_token']
  logger.debug("Calling authentication target with env: #{process_env.inspect}")
  block.call(Hash[system_env].merge(process_env))
end