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# acl-2.0 - simple Access Control List
#
# Copyright (c) 2000,2002,2003 Masatoshi SEKI
#
# acl.rb is copyrighted free software by Masatoshi SEKI.
# You can redistribute it and/or modify it under the same terms as Ruby.
require 'ipaddr'
class ACL
VERSION=["2.0.0"]
class ACLEntry
def initialize(str)
if str == '*' or str == 'all'
@pat = [:all]
elsif str.include?('*')
@pat = [:name, dot_pat(str)]
else
begin
@pat = [:ip, IPAddr.new(str)]
rescue ArgumentError
@pat = [:name, dot_pat(str)]
end
end
end
private
def dot_pat_str(str)
list = str.split('.').collect { |s|
(s == '*') ? '.+' : s
}
list.join("\\.")
end
private
def dot_pat(str)
exp = "^" + dot_pat_str(str) + "$"
Regexp.new(exp)
end
public
def match(addr)
case @pat[0]
when :all
true
when :ip
begin
ipaddr = IPAddr.new(addr[3])
ipaddr = ipaddr.ipv4_mapped if @pat[1].ipv6? && ipaddr.ipv4?
rescue ArgumentError
return false
end
(@pat[1].include?(ipaddr)) ? true : false
when :name
(@pat[1] =~ addr[2]) ? true : false
else
false
end
end
end
class ACLList
def initialize
@list = []
end
public
def match(addr)
@list.each do |e|
return true if e.match(addr)
end
false
end
public
def add(str)
@list.push(ACLEntry.new(str))
end
end
DENY_ALLOW = 0
ALLOW_DENY = 1
def initialize(list=nil, order = DENY_ALLOW)
@order = order
@deny = ACLList.new
@allow = ACLList.new
install_list(list) if list
end
public
def allow_socket?(soc)
allow_addr?(soc.peeraddr)
end
public
def allow_addr?(addr)
case @order
when DENY_ALLOW
return true if @allow.match(addr)
return false if @deny.match(addr)
return true
when ALLOW_DENY
return false if @deny.match(addr)
return true if @allow.match(addr)
return false
else
false
end
end
public
def install_list(list)
i = 0
while i < list.size
permission, domain = list.slice(i,2)
case permission.downcase
when 'allow'
@allow.add(domain)
when 'deny'
@deny.add(domain)
else
raise "Invalid ACL entry #{list.to_s}"
end
i += 2
end
end
end
if __FILE__ == $0
# example
list = %w(deny all
allow 192.168.1.1
allow ::ffff:192.168.1.2
allow 192.168.1.3
)
addr = ["AF_INET", 10, "lc630", "192.168.1.3"]
acl = ACL.new
p acl.allow_addr?(addr)
acl = ACL.new(list, ACL::DENY_ALLOW)
p acl.allow_addr?(addr)
end