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|
#!/usr/bin/env ruby
# Start the server by running:
#
# $ ruby -rwebrick main.rb
require "bundler/inline"
gemfile do
source "https://rubygems.org"
gem "rack", "~> 2.2"
gem "saml-kit", "~> 1.3"
end
require "erb"
require "rack"
class Configuration
def initialize
@config = YAML.safe_load(IO.read("idp.yml"))
end
def [](key)
@config.fetch(key.to_s)
end
end
class User
def name_id_for(name_id_format)
$config[:email]
end
def assertion_attributes_for(request)
{
Username: $config[:email],
MemberOf: $config[:email]
}
end
end
class OnDemandRegistry < Saml::Kit::DefaultRegistry
REGEX = /\/sso\/saml\/samlconf-(?<uuid>[A-Za-z0-9]+)\/metadata/
def metadata_for(entity_id)
found = super(entity_id)
return found if found
uri = URI.parse(entity_id)
if uri.host.include?("terraform.io") || uri.host.include?("ngrok.io")
metadata = Saml::Kit::Metadata.build do |builder|
builder.entity_id = entity_id
builder.build_service_provider do |x|
match = uri.path.match(REGEX)
x.add_assertion_consumer_service("https://#{uri.host}/sso/saml/samlconf-#{match[:uuid]}/acs", binding: :http_post)
end
end
register(metadata)
else
register_url(entity_id, verify_ssl: Rails.env.production?)
end
super(entity_id)
end
end
$config = Configuration.new
Saml::Kit.configure do |x|
x.entity_id = "https://#{$config[:host]}/metadata.xml"
x.registry = OnDemandRegistry.new
x.logger = Logger.new("/dev/stderr")
x.add_key_pair($config[:cert], $config[:insecure_key], use: :signing)
end
class IdentityProvider
def initialize
@storage = {}
end
# Download IDP Metadata
#
# GET /metadata.xml
# Response
#
# Status: 200 OK
# {xml data}
def metadata
xml = Saml::Kit::Metadata.build_xml do |builder|
builder.embed_signature = false
builder.contact_email = 'hi@example.com'
builder.organization_name = "Acme, Inc"
builder.organization_url = "https://example.com"
builder.build_identity_provider do |x|
x.add_single_sign_on_service("https://#{$config[:host]}/sso", binding: :http_post)
x.name_id_formats = [Saml::Kit::Namespaces::EMAIL_ADDRESS]
x.attributes << :MemberOf
x.attributes << :Username
end
end
[200, { 'Content-Type' => "application/samlmetadata+xml" }, [xml]]
end
def post_back(request)
location = "#{$config[:host]}/sso"
params = saml_params_from(request)
saml = if request.post?
Saml::Kit::Bindings::HttpPost
.new(location: location)
.deserialize(params)
else
Saml::Kit::Bindings::HttpRedirect
.new(location: location)
.deserialize(params)
end
url, saml_params = saml.response_for(User.new, binding: :http_post, relay_state: params[:RelayState])
template = <<~ERB
<!doctype html>
<html>
<head><title></title></head>
<body>
<form action="<%= url %>" method="post">
<%- saml_params.each do |(key, value)| -%>
<input type="hidden" name="<%= key %>" value="<%= value %>" />
<%- end -%>
</form>
<script>
document.querySelector('form').submit();
</script>
</body>
</html>
ERB
erb = ERB.new(template, nil, trim_mode: '-')
html = erb.result(binding)
[200, {}, [html]]
end
def call(env)
path = env['PATH_INFO']
case env['REQUEST_METHOD']
when 'GET'
case path
when "/metadata.xml"
return metadata
when "/sso"
return post_back(Rack::Request.new(env))
end
when 'POST'
return post_back(Rack::Request.new(env))
end
not_found
end
private
def not_found
[404, {}, []]
end
def saml_params_from(request)
if request.post?
{
"SAMLRequest" => request.params["SAMLRequest"],
"RelayState" => request.params["RelayState"],
}
else
query_string = request.query_string
on = query_string.include?("&") ? "&" : "&"
result = Hash[query_string.split(on).map { |x| x.split("=", 2) }]
result = result.symbolize_keys
result
end
end
end
if __FILE__ == $0
app = Rack::Builder.new do
use Rack::Reloader
run IdentityProvider.new
end.to_app
Rack::Server.start(app: app, Port: 8282)
end
|
