Class: OmniAuth::Strategies::Swedbank

Inherits:
Object
  • Object
show all
Includes:
ActionDispatch::ContentSecurityPolicy::Request, OmniAuth::Strategy
Defined in:
lib/omniauth/strategies/swedbank.rb

Constant Summary collapse

V008_AUTH_SERVICE = 
'4002'
V008_RESPONSE_SERVICE = 
'3003'
V009_AUTH_SERVICE = 
'4012'
V009_RESPONSE_SERVICE = 
'3013'
SUPPORTED_VERSIONS = 
%w[008 009].freeze

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.render_nonce? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/omniauth/strategies/swedbank.rb', line 14

def self.render_nonce?
   defined?(ActionDispatch::ContentSecurityPolicy::Request) != nil
end

Instance Method Details

#auth_service ⇒ Object 



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# File 'lib/omniauth/strategies/swedbank.rb', line 43

def auth_service
  version_009? ? V009_AUTH_SERVICE : V008_AUTH_SERVICE
end

#callback_phase ⇒ Object 



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# File 'lib/omniauth/strategies/swedbank.rb', line 127

def callback_phase
  if invalid_version?
    return fail!(:unsupported_version_err,
      ArgumentError.new("Unsupported banklink version '#{options.version}'. Supported: #{SUPPORTED_VERSIONS.join(', ')}"))
  end

  begin
    pub_key = OpenSSL::X509::Certificate.new(options.public_key).public_key
  rescue => e
    return fail!(:public_key_load_err, e)
  end

  if request.params['VK_SERVICE'] != response_service
    return fail!(:unsupported_response_service_err)
  end

  if request.params['VK_VERSION'] != options.version
    return fail!(:unsupported_response_version_err)
  end

  if request.params['VK_ENCODING'] != 'UTF-8'
    return fail!(:unsupported_response_encoding_err)
  end

  sig_str = if version_009?
    [
      request.params['VK_SERVICE'],
      request.params['VK_VERSION'],
      request.params['VK_DATETIME'],
      request.params['VK_SND_ID'],
      request.params['VK_REC_ID'],
      request.params['VK_NONCE'],
      request.params['VK_USER_NAME'],
      request.params['VK_USER_ID'],
      request.params['VK_COUNTRY'],
      request.params['VK_OTHER'],
      request.params['VK_TOKEN'],
      request.params['VK_RID']
    ].map{|v| prepend_length(v)}.join
  else
    [
      request.params['VK_SERVICE'],
      request.params['VK_VERSION'],
      request.params['VK_SND_ID'],
      request.params['VK_REC_ID'],
      request.params['VK_NONCE'],
      request.params['VK_INFO']
    ].map{|v| prepend_length(v)}.join
  end

  raw_signature = Base64.decode64(request.params['VK_MAC'])

  if !pub_key.verify(digest, raw_signature, sig_str)
    return fail!(:invalid_response_signature_err)
  end

  super
end

#datetime ⇒ Object 



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# File 'lib/omniauth/strategies/swedbank.rb', line 60

def datetime
  @datetime ||= Time.now.strftime('%Y-%m-%dT%H:%M:%S%z')
end

#digest ⇒ Object 



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# File 'lib/omniauth/strategies/swedbank.rb', line 51

def digest
  version_009? ? OpenSSL::Digest::SHA512.new : OpenSSL::Digest::SHA1.new
end

#invalid_version? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/omniauth/strategies/swedbank.rb', line 39

def invalid_version?
  !SUPPORTED_VERSIONS.include?(options.version)
end

#prepend_length(value) ⇒ Object 



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# File 'lib/omniauth/strategies/swedbank.rb', line 68

def prepend_length(value)
  # prepend length to string in 0xx format
  [ value.to_s.length.to_s.rjust(3, '0'), value.dup.to_s.force_encoding('ascii')].join
end

#request_phase ⇒ Object 



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# File 'lib/omniauth/strategies/swedbank.rb', line 186

def request_phase
  if invalid_version?
    return fail!(:unsupported_version_err,
      ArgumentError.new("Unsupported banklink version '#{options.version}'. Supported: #{SUPPORTED_VERSIONS.join(', ')}"))
  end

  begin
    priv_key = OpenSSL::PKey::RSA.new(options.private_key)
  rescue => e
    return fail!(:private_key_load_err, e)
  end

  unless version_009?
    warn "[DEPRECATION] omniauth-swedbank: Swedbank banklink v008 will be shut down on 2026-06-02. " \
         "Please migrate to v009 by setting `version: '009'` in your provider config. " \
         "See https://www.swedbank.lv/static/business/banklink/LV_Authentication_008_vs_009_instruction.pdf"
  end

  set_locale_from_query_param

  form = OmniAuth::Form.new(:title => I18n.t('omniauth.swedbank.please_wait'), :url => options.site)

  params = {
    'VK_SERVICE' => auth_service,
    'VK_VERSION' => options.version,
    'VK_SND_ID' => options.snd_id,
    'VK_REC_ID' => options.rec_id,
    'VK_NONCE' => stamp,
    'VK_RETURN' => callback_url,
    'VK_MAC' => signature(priv_key),
    'VK_LANG' => resolve_bank_ui_language,
    'VK_ENCODING' => 'UTF-8'
  }

  if version_009?
    params['VK_DATETIME'] = datetime
    params['VK_RID'] = rid
  end

  params.each do |name, val|
    form.html "<input type=\"hidden\" name=\"#{name}\" value=\"#{escape(val)}\" />"
  end

  form.button I18n.t('omniauth.swedbank.click_here_if_not_redirected')

  nonce_attribute = nil
  if self.class.render_nonce?
    nonce_attribute = " nonce='#{escape(content_security_policy_nonce)}'"
  end
  form.instance_variable_set('@html',
    form.to_html.gsub('</form>', "</form><script type=\"text/javascript\"#{nonce_attribute}>document.forms[0].submit();</script>"))
  form.to_response
end

#response_service ⇒ Object 



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# File 'lib/omniauth/strategies/swedbank.rb', line 47

def response_service
  version_009? ? V009_RESPONSE_SERVICE : V008_RESPONSE_SERVICE
end

#rid ⇒ Object 



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# File 'lib/omniauth/strategies/swedbank.rb', line 64

def rid
  ''
end

#signature(priv_key) ⇒ Object 



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# File 'lib/omniauth/strategies/swedbank.rb', line 98

def signature(priv_key)
  Base64.encode64(priv_key.sign(digest, signature_input))
end

#signature_input ⇒ Object 



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# File 'lib/omniauth/strategies/swedbank.rb', line 73

def signature_input
  fields = if version_009?
    [
      auth_service,       # VK_SERVICE
      options.version,    # VK_VERSION
      options.snd_id,     # VK_SND_ID
      options.rec_id,     # VK_REC_ID
      stamp,              # VK_NONCE
      callback_url,       # VK_RETURN
      datetime,           # VK_DATETIME
      rid                 # VK_RID
    ]
  else
    [
      auth_service,       # VK_SERVICE
      options.version,    # VK_VERSION
      options.snd_id,     # VK_SND_ID
      options.rec_id,     # VK_REC_ID
      stamp,              # VK_NONCE
      callback_url        # VK_RETURN
    ]
  end
  fields.map{|v| prepend_length(v)}.join
end

#stamp ⇒ Object 



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# File 'lib/omniauth/strategies/swedbank.rb', line 55

def stamp
  return @stamp if @stamp
  @stamp = Time.now.strftime('%Y%m%d%H%M%S') + SecureRandom.random_number(999999).to_s.rjust(6, '0')
end

#version_009? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/omniauth/strategies/swedbank.rb', line 35

def version_009?
  options.version == '009'
end