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module OpenTox
require "rexml/document"
#Module for policy-processing
# @see also http://www.opentox.org/dev/apis/api-1.2/AA for opentox API specs
# Class Policies corresponds to <policies> container of an xml-policy-fle
class Policies
#Hash for policy objects see {Policy Policy}
attr_accessor :policies, :name
def initialize()
@policies = {}
end
#create new policy instance with name
# @param [String]name of the policy
def new_policy(name)
@policies[name] = Policy.new(name)
end
#drop a specific policy in a policies instance
# @param [String]name of the policy
# @return [Boolean]
def drop_policy(name)
return true if @policies.delete(name)
end
#drop all policies in a policies instance
def drop_policies
@policies.each do |name, policy|
drop_policy(name)
end
return true
end
# @return [Array] set of arrays affected by policies
def uris
@policies.collect{ |k,v| v.uri }.flatten.uniq
end
#list all policy names in a policies instance
# @return [Array]
def names
out = []
@policies.each do |name, policy|
out << name
end
return out
end
# Loads a default policy template in a policies instance
# @param [String]user username in LDAP string of user policy: 'uid=<user>,ou=people,dc=opentox,dc=org'
# @param [String]uri URI
# @param [String]group groupname in LDAP string of group policy: 'cn=<group>,ou=groups,dc=opentox,dc=org'
def load_default_policy(user, uri, group="member")
template = case user
when "guest", "anonymous" then "default_guest_policy"
else "default_policy"
end
xml = File.read(File.join(File.dirname(__FILE__), "templates/#{template}.xml"))
self.load_xml(xml)
datestring = Time.now.strftime("%Y-%m-%d-%H-%M-%S-x") + rand(1000).to_s
@policies["policy_user"].name = "policy_user_#{user}_#{datestring}"
@policies["policy_user"].rule.uri = uri
@policies["policy_user"].rule.name = "rule_user_#{user}_#{datestring}"
@policies["policy_user"].subject.name = "subject_user_#{user}_#{datestring}"
@policies["policy_user"].subject.value = "uid=#{user},ou=people,dc=opentox,dc=org"
@policies["policy_user"].subject_group = "subjects_user_#{user}_#{datestring}"
@policies["policy_group"].name = "policy_group_#{group}_#{datestring}"
@policies["policy_group"].rule.uri = uri
@policies["policy_group"].rule.name = "rule_group_#{group}_#{datestring}"
@policies["policy_group"].subject.name = "subject_group_#{group}_#{datestring}"
@policies["policy_group"].subject.value = "cn=#{group},ou=groups,dc=opentox,dc=org"
@policies["policy_group"].subject_group = "subjects_#{group}_#{datestring}"
return true
end
#loads a xml template
def load_xml(xml)
rexml = REXML::Document.new(xml)
rexml.elements.each("Policies/Policy") do |pol| #Policies
policy_name = pol.attributes["name"]
new_policy(policy_name)
#@policies[policy_name] = Policy.new(policy_name)
rexml.elements.each("Policies/Policy[@name='#{policy_name}']/Rule") do |r| #Rules
rule_name = r.attributes["name"]
uri = rexml.elements["Policies/Policy[@name='#{policy_name}']/Rule[@name='#{rule_name}']/ResourceName"].attributes["name"]
@policies[policy_name].rule.name = rule_name
@policies[policy_name].uri = uri
rexml.elements.each("Policies/Policy[@name='#{policy_name}']/Rule[@name='#{rule_name}']/AttributeValuePair") do |attribute_pairs|
action=nil; value=nil;
attribute_pairs.each_element do |elem|
action = elem.attributes["name"] if elem.attributes["name"]
value = elem.text if elem.text
end
if action and value
case action
when "GET"
@policies[policy_name].rule.get = value
when "POST"
@policies[policy_name].rule.post = value
when "PUT"
@policies[policy_name].rule.put = value
when "DELETE"
@policies[policy_name].rule.delete = value
end
end
end
end
rexml.elements.each("Policies/Policy[@name='#{policy_name}']/Subjects") do |subjects| #Subjects
@policies[policy_name].subject_group = subjects.attributes["name"]
rexml.elements.each("Policies/Policy[@name='#{policy_name}']/Subjects[@name='#{@policies[policy_name].subject_group}']/Subject") do |s| #Subject
subject_name = s.attributes["name"]
subject_type = s.attributes["type"]
subject_value = rexml.elements["Policies/Policy[@name='#{policy_name}']/Subjects[@name='#{@policies[policy_name].subject_group}']/Subject[@name='#{subject_name}']/AttributeValuePair/Value"].text
if subject_name and subject_type and subject_value
@policies[policy_name].subject.name = subject_name
@policies[policy_name].type = subject_type
@policies[policy_name].value = subject_value
end
end
end
end
end
#generates xml from policies instance
def to_xml
doc = REXML::Document.new()
doc << REXML::DocType.new("Policies", "PUBLIC \"-//Sun Java System Access Manager7.1 2006Q3\n Admin CLI DTD//EN\" \"jar://com/sun/identity/policy/policyAdmin.dtd\"")
doc.add_element(REXML::Element.new("Policies"))
@policies.each do |name, pol|
policy = REXML::Element.new("Policy")
policy.attributes["name"] = pol.name
policy.attributes["referralPolicy"] = false
policy.attributes["active"] = true
rule = @policies[name].rule
out_rule = REXML::Element.new("Rule")
out_rule.attributes["name"] = rule.name
servicename = REXML::Element.new("ServiceName")
servicename.attributes["name"]="iPlanetAMWebAgentService"
out_rule.add_element(servicename)
rescourcename = REXML::Element.new("ResourceName")
rescourcename.attributes["name"] = rule.uri
out_rule.add_element(rescourcename)
["get","post","delete","put"].each do |act|
if rule.method(act).call
attribute = REXML::Element.new("Attribute")
attribute.attributes["name"] = act.upcase
attributevaluepair = REXML::Element.new("AttributeValuePair")
attributevaluepair.add_element(attribute)
attributevalue = REXML::Element.new("Value")
attributevaluepair.add_element(attributevalue)
attributevalue.add_text REXML::Text.new(rule.method(act).call)
out_rule.add_element(attributevaluepair)
end
end
policy.add_element(out_rule)
subjects = REXML::Element.new("Subjects")
subjects.attributes["name"] = pol.subject_group
subjects.attributes["description"] = ""
subj = @policies[name].subject.name
subject = REXML::Element.new("Subject")
subject.attributes["name"] = pol.subject.name
subject.attributes["type"] = pol.subject.type
subject.attributes["includeType"] = "inclusive"
attributevaluepair = REXML::Element.new("AttributeValuePair")
attribute = REXML::Element.new("Attribute")
attribute.attributes["name"] = "Values"
attributevaluepair.add_element(attribute)
attributevalue = REXML::Element.new("Value")
attributevalue.add_text REXML::Text.new(pol.subject.value)
attributevaluepair.add_element(attributevalue)
subject.add_element(attributevaluepair)
subjects.add_element(subject)
policy.add_element(subjects)
doc.root.add_element(policy)
end
out = ""
doc.write(out, 2)
return out
end
end
#single policy in a {Policies Policies} instance
class Policy
attr_accessor :name, :rule, :subject_group, :subject, :value, :type, :uri, :group, :user
def initialize(name)
@name = name
@rule = Rule.new("#{name}_rule", nil)
@subject_group = "#{name}_subjects"
@subject = Subject.new("#{name}_subject", nil, nil)
end
# Subject type LDAPUsers or LDAPGroups
def type
@subject.type
end
# Set subject type <LDAPUsers, LDAPGroups>
# @param [String],type
def type=(type)
@subject.type = type
end
# returns LDAP Distinguished Name (DN) e.g. uid=username,ou=people,dc=opentox,dc=org or cn=membergroup,ou=groups,dc=opentox,dc=org
def value
@subject.value
end
# sets LDAP Distinguished Name (DN) for policy e.g.
# @param [String],LDAPString
def value=(value)
@subject.value = value
end
# uri affected by policy
# @return uri affected by policy
def uri
@rule.uri
end
# sets uri affected by policy
# @param [String] set URI
def uri=(uri)
@rule.uri = uri
end
# Get the groupname from within the LDAP Distinguished Name (DN)
def group
return false if !value && type != "LDAPGroups"
value.split(",").each{|part| return part.gsub("cn=","") if part.match("cn=")}
end
# Get the username from within the LDAP Distinguished Name (DN)
def user
return false if !value && type != "LDAPUsers"
value.split(",").each{|part| return part.gsub("uid=","") if part.match("uid=")}
end
# helper method sets value and type to opentox LDAP Distinguished Name (DN) of a user
def set_ot_user(username)
self.value = "uid=#{username},ou=people,dc=opentox,dc=org"
self.type = "LDAPUsers"
true
end
def set_ot_group(groupname)
self.value = "cn=#{groupname},ou=groups,dc=opentox,dc=org"
self.type = "LDAPGroups"
true
end
#rule inside a policy
class Rule
attr_accessor :name, :uri, :get, :post, :put, :delete, :read, :readwrite
def initialize(name, uri)
@name = name
@uri = uri
end
#Set Rule attribute for request-method GET
# @param [String]value (allow,deny,nil)
def get=(value)
@get = check_value(value, @get)
end
#Set Rule attribute for request-method POST
# @param [String]value (allow,deny,nil)
def post=(value)
@post = check_value(value, @post)
end
#Set Rule attribute for request-method DELETE
# @param [String]value (allow,deny,nil)
def delete=(value)
@delete = check_value(value, @delete)
end
#Set Rule attribute for request-method PUT
# @param [String]value (allow,deny,nil)
def put=(value)
@put = check_value(value, @put)
end
def read
return true if @get == "allow" && (@put == "deny" || !@put) && (@post == "deny" || !@post)
end
def readwrite
return true if @get == "allow" && @put == "allow" && @post == "allow"
end
def read=(value)
if value
@get = "allow"; @put = nil; @post = nil
else
@get = nil; @put = nil; @post = nil
end
end
def readwrite=(value)
if value
@get = "allow"; @put = "allow"; @post = "allow"
else
@get = nil; @put = nil; @post = nil
end
end
private
#checks if value is allow, deny or nil. returns old value if not valid.
def check_value(new_value, old_value)
return (new_value=="allow" || new_value=="deny" || new_value==nil) ? new_value : old_value
end
end
class Subject
attr_accessor :name, :type, :value
def initialize(name, type, value)
@name = name
@type = type
@value = value
end
end
end
end
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