1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
|
#!/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", git: "github.com:xlgmokha/saml-kit", branch: "main"
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, :authz_host
def initialize(authz_host, client_id, client_secret)
@authz_host = authz_host
@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 [](key)
server_metadata.fetch(key)
end
def authorize_uri(state: SecureRandom.uuid, response_type: "code", response_mode: "query", scope: "openid")
[
self[:authorization_endpoint],
to_query(
client_id: client_id,
state: state,
redirect_uri: redirect_uri,
response_mode: response_mode,
response_type: response_type,
scope: scope,
)
].join("?")
end
def exchange(grant_type, params = {})
with_http do |client|
client.post(self[:token_endpoint], body: body_for(grant_type, params))
end
end
private
def body_for(grant_type, params)
case grant_type
when "authorization_code"
{
grant_type: grant_type,
code: params.fetch(:code),
code_verifier: params.fetch(:code_verifier, "not_implemented"),
}
when "urn:ietf:params:oauth:grant-type:saml2-bearer"
{
grant_type: grant_type,
assertion: params.fetch(:assertion),
}
else
raise NotImplementedError.new(grant_type)
end
end
def to_query(params = {})
params.map do |(key, value)|
[key, value].join("=")
end.join("&")
end
def redirect_uri
"#{$scheme}://#{$host}/oauth/callback"
end
def with_http
http.with_retry do |client|
yield client
end
end
def server_metadata
@server_metadata ||=
with_http do |client|
response = client.get("http://#{authz_host}/.well-known/oauth-authorization-server")
JSON.parse(response.body, symbolize_names: true)
end
end
end
end
module HTTPHelpers
def current_user?(request)
request.session[:access_token]
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' => "#{$scheme}://#{$host}#{location}" }, []]
end
end
def with_layout(bind)
template = <<~ERB
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body style="background-color: pink;">
#{yield}
</body>
</html>
ERB
ERB.new(template, trim_mode: '-').result(bind)
end
end
class UI
include ::HTTPHelpers
attr_reader :oauth_client
def initialize(oauth_client)
@oauth_client = oauth_client
end
def call(env)
request = Rack::Request.new(env)
case request.request_method
when Rack::GET
case request.path
when "/index.html"
html = with_layout(binding) do
<<~ERB
<%- if current_user?(request) -%>
<a href="/groups.html">Groups</a>
<h1>Access Token</h1>
<pre><%= request.session[:access_token] %></pre>
<h1>ID Token</h1>
<pre><%= request.session[:id_token] %></pre>
<form action="/logout" method="post">
<input type="submit" value="Logout" />
</form>
<%- else -%>
<a href="/saml/new">SAML Login</a>
<a href="/oidc/new">OIDC Login</a>
<%- end -%>
ERB
end
return [200, { 'Content-Type' => "text/html" }, [html]]
when "/groups.html"
if current_user?(request)
return get_groups(request)
else
return redirect_to("/oidc/new")
end
when /\A\/groups\/\d+\/projects.html\z/
if current_user?(request)
return get_projects(request)
else
return redirect_to("/oidc/new")
end
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("/index.html")
end
when Rack::POST
case request.path
when "/logout"
request.session.delete(:access_token)
request.session.delete(:id_token)
request.session.delete(:refresh_token)
return redirect_to("/")
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::PERSISTENT]
x.add_assertion_consumer_service("#{$scheme}://#{$host}/saml/assertions", binding: :http_post)
end
end
[200, { 'Content-Type' => "application/samlmetadata+xml" }, [xml]]
end
def oauth_callback(request)
response = oauth_client.exchange("authorization_code", code: request.params['code'])
if response.code == "200"
tokens = JSON.parse(response.body, symbolize_names: true)
request.session[:access_token] = tokens[:access_token]
request.session[:id_token] = tokens[:id_token]
request.session[:refresh_token] = tokens[:access_token]
template = <<~ERB
<!DOCTYPE html>
<html>
<head><title></title></head>
<body style="background-color: pink;">
<pre style="display: none;"><%= response.body %></pre>
<pre><%= JSON.pretty_generate(request.session[:access_token]) %></pre>
<a href="/index.html">Home</a>
<a href="/groups.html">Groups</a>
</body>
</html>
ERB
html = ERB.new(template, trim_mode: '-').result(binding)
[200, { 'Content-Type' => "text/html" }, [html]]
else
[response.code, response.header, [response.body]]
end
end
def get_groups(request)
http = Net::Hippie::Client.new(headers: ::Net::Hippie::Client::DEFAULT_HEADERS.merge({
'Authorization' => Net::Hippie.bearer_auth(request.session[:access_token])
}))
response = http.get("http://api.example.com:8080/groups.json")
if response.code == "200"
groups = JSON.parse(response.body, symbolize_names: true)
html = with_layout(binding) do
<<~ERB
<a href="/index.html">Home</a>
<a href="/groups.html">Groups</a>
<form action="/logout" method="post">
<input type="submit" value="Logout" />
</form>
<table>
<thead>
<tr>
<th>ID</th>
<th>Name</th>
<th>Organization ID</th>
<th>Parent ID</th>
<th> </th>
</tr>
</thead>
<tbody>
<%- groups.each do |group| -%>
<tr>
<td><%= group[:id] %></td>
<td><%= group[:name] %></td>
<td><%= group[:organization_id] %></td>
<td><%= group[:parent_id] %></td>
<td><a href="/groups/<%= group[:id] %>/projects.html">Projects</a></td>
</tr>
<%- end -%>
</tbody>
</table>
ERB
end
[200, { 'Content-Type' => "text/html" }, [html]]
else
[response.code, response.header, [response.body]]
end
end
def get_projects(request)
http = Net::Hippie::Client.new(headers: ::Net::Hippie::Client::DEFAULT_HEADERS.merge({
'Authorization' => Net::Hippie.bearer_auth(request.session[:access_token])
}))
response = http.get("http://api.example.com:8080/projects.json")
if response.code == "200"
projects = JSON.parse(response.body, symbolize_names: true)
html = with_layout(binding) do
<<~ERB
<a href="/index.html">Home</a>
<a href="/groups.html">Groups</a>
<form action="/logout" method="post">
<input type="submit" value="Logout" />
</form>
<table>
<thead>
<tr>
<th>Name</th>
<th>Group ID</th>
</tr>
</thead>
<tbody>
<%- projects.each do |project| -%>
<tr>
<td><%= project[:name] %></td>
<td><%= project[:group_id] %></td>
</tr>
<%- end -%>
</tbody>
</table>
ERB
end
[200, { 'Content-Type' => "text/html" }, [html]]
else
[response.code, response.header, [response.body]]
end
end
def saml_post_to_idp(request)
idp = Saml::Kit.registry.metadata_for("http://#{$idp_host}/saml/metadata.xml")
relay_state = Base64.strict_encode64(JSON.generate(redirect_to: '/dashboard'))
@saml_builder = nil
uri, saml_params = idp.login_request_for(binding: :http_post, relay_state: relay_state) do |builder|
@saml_builder = builder
end
html = with_layout(binding) do
<<~ERB
<h2>Sending SAML Request (SP -> IdP)</h2>
<textarea readonly="readonly" disabled="disabled" cols=225 rows=6><%=- @saml_builder.to_xml(pretty: true) -%></textarea>
<form id="idp-form" action="<%= uri %>" method="post">
<%- saml_params.each do |(key, value)| -%>
<input type="hidden" name="<%= key %>" value="<%= value %>" />
<%- end -%>
<input id="submit-button" type="submit" value="Submit" />
</form>
ERB
end
[200, { 'Content-Type' => "text/html" }, [html]]
end
def saml_assertions(request)
sp = Saml::Kit.registry.metadata_for("#{$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?
assertion = Base64.strict_encode64(saml_response.assertion.to_xml)
response = oauth_client.exchange(
"urn:ietf:params:oauth:grant-type:saml2-bearer",
assertion: assertion,
)
if response.code == "200"
tokens = JSON.parse(response.body, symbolize_names: true)
request.session[:access_token] = tokens[:access_token]
request.session[:refresh_token] = tokens[:access_token]
html = with_layout(binding) do
<<~ERB
<a href="/index.html">Home</a>
<a href="/groups.html">Groups</a>
<h2>Received SAML Response</h2>
<textarea readonly="readonly" disabled="disabled" cols=220 rows=40><%=- saml_response.to_xml(pretty: true) -%></textarea>
<pre id="raw-saml-response" style="display: none;"><%= request.params["SAMLResponse"] %></pre>
<pre id="xml-saml-assertion" style="display: none;"><%= saml_response.assertion.to_xml(pretty: true) %></pre>
<pre id="access-token" style="display: none;"><%= JSON.pretty_generate(request.session[:access_token]) %></pre>
ERB
end
[200, { 'Content-Type' => "text/html" }, [html]]
else
[response.code, response.header, [response.body]]
end
end
end
if __FILE__ == $0
app = Rack::Builder.new do
use Rack::CommonLogger
use Rack::Reloader
use Rack::Session::Cookie, { domain: $host.split(":", 2)[0], path: "/", secret: SecureRandom.hex(64) }
run UI.new(::OAuth::Client.new($idp_host, 'client_id', 'client_secret'))
end.to_app
Rackup::Server.start(app: app, Port: $port)
end
|
