Class: Onelogin::Saml::Metadata

Inherits:
Object
  • Object
show all
Includes:
Coding, REXML
Defined in:
lib/onelogin/ruby-saml/metadata.rb

Constant Summary collapse

HTTP_POST =

a few symbols for SAML class names

"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
HTTP_GET = 
"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect"

Instance Method Summary collapse

Methods included from Coding

#decode, #deflate, #encode, #escape, #inflate, #unescape

Constructor Details

#initialize(settings = nil) ⇒ Metadata

Returns a new instance of Metadata.



20
21
22
23
24
 
# File 'lib/onelogin/ruby-saml/metadata.rb', line 20

def initialize(settings=nil)
  if settings
    @settings = settings
  end
end

Instance Method Details

#binding_select(service) ⇒ Object

get the IdP metadata, and select the appropriate SSO binding that we can support. Currently this is HTTP-Redirect and HTTP-POST but more could be added in the future



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
 
# File 'lib/onelogin/ruby-saml/metadata.rb', line 130

def binding_select(service)
  # first check if we're still using the old hard coded method for 
  # backwards compatability
  if service == "SingleSignOnService" && @settings.idp_metadata == nil && @settings.idp_sso_target_url != nil
      return @settings.idp_sso_target_url
  end
  if service == "SingleLogoutService" && @settings.idp_metadata == nil && @settings.idp_slo_target_url != nil
      return  @settings.idp_slo_target_url
  end
  
  meta_doc = get_idp_metadata
  
  return nil unless meta_doc
  # first try POST
  sso_element = REXML::XPath.first(meta_doc, "/md:EntityDescriptor/md:IDPSSODescriptor/md:#{service}[@Binding='#{HTTP_POST}']")
  if !sso_element.nil? 
    @URL = sso_element.attributes["Location"]
    #Logging.debug "binding_select: POST to #{@URL}"
    return @URL
  end
  
  # next try GET
  sso_element = REXML::XPath.first(meta_doc, "/md:EntityDescriptor/md:IDPSSODescriptor/md:#{service}[@Binding='#{HTTP_GET}']")
  if !sso_element.nil? 
    @URL = sso_element.attributes["Location"]
    Logging.debug "binding_select: GET from #{@URL}"
    return @URL
  end
  # other types we might want to add in the future:  SOAP, Artifact
end

#build_message(options = {}) ⇒ Object

Construct a SAML message using information in the IdP metadata.

:type can be either “SAMLRequest” or “SAMLResponse” :service refers to the Binding method,

either "SingleLogoutService" or "SingleSignOnService"

:message is the SAML message itself (XML)

I’ve provided easy to use wrapper functions above



121
122
123
124
125
 
# File 'lib/onelogin/ruby-saml/metadata.rb', line 121

def build_message( options = {} )
  opt = { :type => nil, :service => nil, :message => nil, :extra_parameters => nil }.merge(options)
  url = binding_select( opt[:service] )
  return message_get( opt[:type], url, opt[:message], opt[:extra_parameters] )
end

#create_slo_request(message, extra_parameters = {}) ⇒ Object 



104
105
106
107
108
 
# File 'lib/onelogin/ruby-saml/metadata.rb', line 104

def create_slo_request(message, extra_parameters = {} )
  build_message( :type => "SAMLRequest", 
      :service => "SingleLogoutService", 
      :message => message, :extra_parameters => extra_parameters)
end

#create_slo_response(message, extra_parameters = {}) ⇒ Object 



109
110
111
112
113
 
# File 'lib/onelogin/ruby-saml/metadata.rb', line 109

def create_slo_response(message, extra_parameters = {} )
  build_message( :type => "SAMLResponse", 
      :service => "SingleLogoutService", 
      :message => message, :extra_parameters => extra_parameters)     
end

#create_sso_request(message, extra_parameters = {}) ⇒ Object 



94
95
96
97
98
 
# File 'lib/onelogin/ruby-saml/metadata.rb', line 94

def create_sso_request(message, extra_parameters = {} )
  build_message( :type => "SAMLRequest", 
      :service => "SingleSignOnService", 
      :message => message, :extra_parameters => extra_parameters)
end

#create_sso_response(message, extra_parameters = {}) ⇒ Object 



99
100
101
102
103
 
# File 'lib/onelogin/ruby-saml/metadata.rb', line 99

def create_sso_response(message, extra_parameters = {} )
  build_message( :type => "SAMLResponse", 
      :service => "SingleSignOnService", 
      :message => message, :extra_parameters => extra_parameters)     
end

#extract_certificate(meta_doc) ⇒ Object 



225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
 
# File 'lib/onelogin/ruby-saml/metadata.rb', line 225

def extract_certificate(meta_doc)

  # pull out the x509 tag
  x509 = REXML::XPath.first(meta_doc, "/md:EntityDescriptor/md:IDPSSODescriptor"+"/md:KeyDescriptor"+"/ds:KeyInfo/ds:X509Data/ds:X509Certificate"
      )
  # If the IdP didn't specify the use attribute
  if x509.nil?
    x509 = REXML::XPath.first(meta_doc, 
          "/EntityDescriptor/IDPSSODescriptor" +
        "/KeyDescriptor" +
        "/ds:KeyInfo/ds:X509Data/ds:X509Certificate"
      )
  end
  @settings.idp_cert = x509.text.gsub(/\n/, "").gsub(/\t/, "")
end

#generate(settings) ⇒ Object 



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
 
# File 'lib/onelogin/ruby-saml/metadata.rb', line 26

def generate(settings)
  meta_doc = REXML::Document.new
  root = meta_doc.add_element "md:EntityDescriptor", { 
      "xmlns:md"        => "urn:oasis:names:tc:SAML:2.0:metadata",
      "xmlns:xml"       => "http://www.w3.org/XML/1998/namespace",
      "cacheDuration"   => "P1M" 
  }
  if settings.issuer != nil
    root.attributes["entityID"] = settings.issuer
  end
  sp_sso = root.add_element "md:SPSSODescriptor", { 
      "protocolSupportEnumeration" => "urn:oasis:names:tc:SAML:2.0:protocol",
      "WantAssertionsSigned"       => "true"

  }
    name_identifier_formats = settings.name_identifier_format
    if name_identifier_formats != nil
      name_id = []
      name_identifier_formats.each_with_index{ |format, index|
        name_id[index] = sp_sso.add_element "md:NameIDFormat"
        name_id[index].text = format
      }
      
    end
    if settings.sp_cert != nil
      keyDescriptor = sp_sso.add_element "md:KeyDescriptor", {
        "use" => "signing"
      }
      keyInfo = keyDescriptor.add_element "ds:KeyInfo", {
        "xmlns:ds" => "http://www.w3.org/2000/09/xmldsig#"
      }
      x509Data = keyInfo.add_element "ds:X509Data"
      x509Certificate = x509Data.add_element "ds:X509Certificate"
      file = ""
      File.foreach(settings.sp_cert){ |line|
                                   file  += line unless (line.include?("RSA PUBLIC KEY") || line.include?("CERTIFICATE")) 
                                 }
      x509Certificate.text = file                            
    end
    if settings.assertion_consumer_service_url != nil
      sp_sso.add_element "md:AssertionConsumerService", {
          # Add this as a setting to create different bindings?
          "Binding" => "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST",
          "Location" => settings.assertion_consumer_service_url,
          "index" => "1"
      }
    end
    if settings.single_logout_service_url != nil
      sp_sso.add_element "md:SingleLogoutService", {
          "Binding" => "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect",
          "Location" => settings.single_logout_service_url
      }
      sp_sso.add_element "md:SingleLogoutService", {
          "Binding" => "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST",
          "Location" => settings.single_logout_service_url
      }
    end
  meta_doc << REXML::XMLDecl.new(version='1.0', encoding='UTF-8')
  ret = ""
  # pretty print the XML so IdP administrators can easily see what the SP supports
  meta_doc.write(ret, 1)

  #Logging.debug "Generated metadata:\n#{ret}"

  return ret

end

#get_idp_metadata ⇒ Object

Retrieve the remote IdP metadata from the URL or a cached copy returns a REXML document of the metadata



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
 
# File 'lib/onelogin/ruby-saml/metadata.rb', line 163

def get_idp_metadata
  return false if @settings.idp_metadata.nil?

  # Look up the metdata in cache first
  id = Digest::MD5.hexdigest(@settings.idp_metadata)

  uri = URI.parse(@settings.idp_metadata)
  if uri.scheme == "http"
    response = Net::HTTP.get_response(uri)
    meta_text = response.body
  elsif uri.scheme == "https"
    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = true
    # Most IdPs will probably use self signed certs
    #http.verify_mode = OpenSSL::SSL::VERIFY_PEER
    http.verify_mode = OpenSSL::SSL::VERIFY_NONE
    get = Net::HTTP::Get.new(uri.request_uri)
    response = http.request(get)
    meta_text = response.body
  end
  testo_response = meta_text.sub!(' xmlns:xml="http://www.w3.org/XML/1998/namespace"', '')
  doc = REXML::Document.new(testo_response)
  extract_certificate(doc)
  return doc


  # lookup = @cache.read(id)
  # if lookup != nil
  #   Logging.debug "IdP metadata cached lookup for #{@settings.idp_metadata}"
  #   doc = REXML::Document.new( lookup )
  #   extract_certificate( doc )
  #   return doc
  # end
  
  # Logging.debug "IdP metadata cache miss on #{@settings.idp_metadata}"
  # # cache miss
  # if File.exists?(@settings.idp_metadata)
  #   fp = File.open( @settings.idp_metadata, "r")
  #   meta_text = fp.read
  # else
  #   uri = URI.parse(@settings.idp_metadata)
  #   if uri.scheme == "http"
  #     response = Net::HTTP.get_response(uri)
  #     meta_text = response.body
  #   elsif uri.scheme == "https"
  #     http = Net::HTTP.new(uri.host, uri.port)
  #     http.use_ssl = true
  #     # Most IdPs will probably use self signed certs
  #     #http.verify_mode = OpenSSL::SSL::VERIFY_PEER
  #     http.verify_mode = OpenSSL::SSL::VERIFY_NONE
  #     get = Net::HTTP::Get.new(uri.request_uri)
  #     response = http.request(get)
  #     meta_text = response.body
  #   end
  # end
  # # Add it to the cache
  # @cache.write(id, meta_text, @settings.idp_metadata_ttl )
  # doc = REXML::Document.new( meta_text )
  # extract_certificate(doc)
  # return doc
end

#message_get(type, url, message, extra_parameters = {}) ⇒ Object

construct the parameter list on the URL and return



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
 
# File 'lib/onelogin/ruby-saml/metadata.rb', line 242

def message_get( type, url, message, extra_parameters = {} )

  params = Hash.new
  if extra_parameters
    params.merge!(extra_parameters)
  end
  # compress GET requests to try and stay under that 8KB request limit
  
  #fa il deflate di samlrequest
  params[type] = encode( deflate( message ) )
  
  Logging.debug "#{type}=#{params[type]}"
  
  uri = Addressable::URI.parse(url)
  if uri.query_values == nil
    uri.query_values = params
  else
    # solution to stevenwilkin's parameter merge
    uri.query_values = params.merge(uri.query_values)
  end
  url = uri.to_s
  #url = @URL + "?SAMLRequest=" + @request_params["SAMLRequest"]
  Logging.debug "Sending to URL #{url}"
  return url
end