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|
# acl-1.0 - simple Access Control List
#
# $Date: 2000/12/25 18:24:44 $
# Copyright (c) 2000 Masatoshi SEKI
#
# acl.rb is copyrighted free software by Masatoshi SEKI.
# You can redistribute it and/or modify it under the same term as Ruby.
class ACL
VERSION=["1.0.1", "$Id: acl.rb,v 1.8 2000/12/25 18:24:44 mas Exp $"]
class ACLEntry
def initialize(str)
if str == '*' or str == 'all'
@pat = [:all]
elsif str =~ /^[0-9*]+\.[0-9*]+\.[0-9*]+\.[0-9*]+$/
@pat = [:ip, dot_pat_ip(str)]
elsif str =~ /^(([0-9a-f:]+)|(\*)):([0-9*]+\.[0-9*]+\.[0-9*]+\.[0-9*]+)$/
ipv6hexpart = $1
ipv4address = $4
@pat = [:ip, dot_pat_ipv6(ipv6hexpart, ipv4address)]
else
@pat = [:name, dot_pat(str)]
end
end
private
def dot_pat_str(str)
list = str.split('.').collect { |s|
(s == '*') ? '.+' : s
}
list.join("\\.")
end
private
def dot_pat(str)
exp = "^" + dot_pat_str(str) + "$"
Regexp.new(exp)
end
private
def dot_pat_ip(str)
exp = "^([0-9a-fA-F:]+:)?" + dot_pat_str(str) + "$"
Regexp.new(exp)
end
private
def dot_pat_ipv6(hexpart, addr)
hexpart = "[0-9a-fA-F:]+" if hexpart == '*'
exp = hexpart + ":" + dot_pat_str(addr) + "$"
Regexp.new(exp)
end
public
def match(addr)
case @pat[0]
when :all
true
when :ip
(@pat[1] =~ addr[3]) ? 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)
for i in (0..(list.size/2-1))
case list[i*2].downcase
when 'allow'
@allow.add(list[i*2+1])
when 'deny'
@deny.add(list[i*2+1])
else
raise "Invalid ACL entry #{list.to_s}"
end
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
|
