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|
#!/usr/bin/env ruby
require "bundler/inline"
gemfile do
source "https://rubygems.org"
gem "base64", "~> 0.1"
gem "erb", "~> 4.0"
gem "net-hippie", "~> 1.0"
gem "rack", "~> 3.0"
gem "rack-session", "~> 2.0"
gem "rackup", "~> 2.0"
gem "saml-kit", "~> 1.0"
gem "webrick", "~> 1.0"
end
$scheme = ENV.fetch("SCHEME", "http")
$port = ENV.fetch("PORT", 8283).to_i
$host = ENV.fetch("HOST", "localhost:#{$port}")
$idp_host = ENV.fetch("IDP_HOST", "localhost:8282")
Net::Hippie.logger = Logger.new($stdout, level: :debug)
class OnDemandRegistry < Saml::Kit::DefaultRegistry
def metadata_for(entity_id)
found = super(entity_id)
return found if found
register_url(entity_id, verify_ssl: false)
super(entity_id)
end
end
Saml::Kit.configure do |x|
x.entity_id = "#{$scheme}://#{$host}/saml/metadata.xml"
x.registry = OnDemandRegistry.new
x.logger = Logger.new("/dev/stderr")
end
module OAuth
class Client
attr_reader :client_id, :client_secret, :http
def initialize(client_id, client_secret)
@client_id = client_id
@client_secret = client_secret
@http = Net::Hippie::Client.new(headers: ::Net::Hippie::Client::DEFAULT_HEADERS.merge({
'Authorization' => Net::Hippie.basic_auth(client_id, client_secret),
}))
end
def authorize_uri
"http://#{$idp_host}/oauth/authorize?client_id=#{client_id}&state=example&redirect_uri=#{$scheme}://#{$host}/oauth/callback&response_type=code&response_mode=query&scope=openid"
end
def with_http
http.with_retry do |client|
yield client
end
end
def exchange(grant_type:, code:)
with_http do |client|
client.post("http://#{$idp_host}/oauth/token", body: {
grant_type: grant_type,
code: code,
code_verifier: "not_implemented"
})
end
end
end
end
class UI
attr_reader :oauth_client
def initialize(oauth_client)
@oauth_client = oauth_client
end
def call(env)
path = env['PATH_INFO']
case env['REQUEST_METHOD']
when 'GET'
case path
when "/oauth/callback"
return oauth_callback(Rack::Request.new(env))
when "/oidc/new"
return redirect_to(oauth_client.authorize_uri)
when "/saml/metadata.xml"
return metadata
when "/saml/new"
return saml_post_to_idp(Rack::Request.new(env))
else
return redirect_to("/saml/new")
end
when 'POST'
case path
when "/saml/assertions"
return saml_assertions(Rack::Request.new(env))
else
return not_found
end
end
not_found
end
private
def metadata
xml = Saml::Kit::Metadata.build_xml do |builder|
builder.embed_signature = false
builder.contact_email = 'ui@example.com'
builder.organization_name = "Acme, Inc"
builder.organization_url = "https://example.com"
builder.build_service_provider do |x|
x.name_id_formats = [Saml::Kit::Namespaces::EMAIL_ADDRESS]
x.add_assertion_consumer_service("#{$scheme}://#{$host}/saml/assertions", binding: :http_post)
end
end
[200, { 'Content-Type' => "application/samlmetadata+xml" }, [xml]]
end
def not_found
[404, { 'X-Backend-Server' => 'UI' }, []]
end
def redirect_to(location)
if location.start_with?("http")
[302, { 'Location' => location }, []]
else
[302, { 'Location' => "http://ui.example.com:8080#{location}" }, []]
end
end
def oauth_callback(request)
response = oauth_client.exchange(grant_type: "authorization_code", code: request.params['code'])
[response.code, response.header, [response.body]]
end
def saml_post_to_idp(request)
idp = Saml::Kit.registry.metadata_for("http://#{$idp_host}/saml/metadata.xml")
relay_state = Base64.strict_encode64(JSON.generate(redirect_to: '/dashboard'))
@saml_builder = nil
uri, saml_params = idp.login_request_for(binding: :http_post, relay_state: relay_state) do |builder|
@saml_builder = builder
end
template = <<~ERB
<!doctype html>
<html>
<head><title></title></head>
<body style="background-color: pink;">
<h2>Sending SAML Request (SP -> IdP)</h2>
<textarea readonly="readonly" disabled="disabled" cols=225 rows=6><%=- @saml_builder.to_xml(pretty: true) -%></textarea>
<form id="idp-form" action="<%= uri %>" method="post">
<%- saml_params.each do |(key, value)| -%>
<input type="hidden" name="<%= key %>" value="<%= value %>" />
<%- end -%>
<input id="submit-button" type="submit" value="Submit" />
</form>
</body>
</html>
ERB
html = ERB.new(template, trim_mode: '-').result(binding)
[200, { 'Content-Type' => "text/html" }, [html]]
end
def saml_assertions(request)
sp = Saml::Kit.registry.metadata_for("#{$scheme}://#{$host}/saml/metadata.xml")
saml_binding = sp.assertion_consumer_service_for(binding: :http_post)
saml_response = saml_binding.deserialize(request.params)
raise saml_response.errors unless saml_response.valid?
request.session[:access_token] = saml_response.attributes[:access_token]
template = <<~ERB
<!doctype html>
<html>
<head><title></title></head>
<body style="background-color: pink;">
<h2>Received SAML Response</h2>
<textarea readonly="readonly" disabled="disabled" cols=220 rows=40><%=- saml_response.to_xml(pretty: true) -%></textarea>
</body>
</html>
ERB
erb = ERB.new(template, trim_mode: '-')
html = erb.result(binding)
[200, { 'Content-Type' => "text/html" }, [html]]
end
end
if __FILE__ == $0
app = Rack::Builder.new do
use Rack::CommonLogger
use Rack::Reloader
use Rack::Session::Cookie, { domain: $host.split(":", 2)[0], path: "/", secret: SecureRandom.hex(64) }
run UI.new(::OAuth::Client.new('client_id', 'client_secret'))
end.to_app
Rackup::Server.start(app: app, Port: $port)
end
|
