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--[[ ACF Logon/Logoff authenticator that uses plaintext files
Copyright (c) 2007 Nathan Angelacos
GPL2 license
The password file is in the format:
userid:password:username:role1[,role2...]
]]--
module (..., package.seeall)
local sess = require ("session")
local pvt={}
pvt.parse_authfile = function(filename)
local row = {}
-- open our password file
local f = io.open (filename)
if f then
local m = (f:read("*all") or "" ).. "\n"
f:close()
for l in string.gmatch(m, "(%C*)\n") do
local userid, password, username, roles =
string.match(l, "([^:]*):([^:]*):([^:]*):(.*)")
local r = {}
roles=roles or ""
for x in string.gmatch(roles, "([^,]%w+),?") do
table.insert (r, x )
end
local a = {}
a.userid = userid
a.password = password
a.username = username
a.roles = r
table.insert (row, a)
end
return row
else
return nil
end
end
pvt.get_id = function(userid, authstruct)
if authstruct == nil then return nil end
for x = 1,#authstruct do
if authstruct[x].userid == userid then
return authstruct[x]
end
end
end
--- public methods
-- This function returns true or false, and
-- if false: the reason for failure
authenticate = function ( self, userid, password )
password = password or ""
userid = userid or ""
local t = pvt.parse_authfile(self.conf.confdir .. "/passwd")
if t == false then
return false, "password file is missing"
else
if userid ~= nil then
local id = pvt.get_id (userid, t)
if id == false or id == nil then
return false, "Userid not found"
end
if id.password ~= password then
return false, "Invalid password"
end
else
return false
end
return true
end
end
pvt.permission_to_change = function()
--FIXME: See to that user is allowed to change things
return true
end
pvt.availablefields = function (field)
-- This is a list of fileds in the /passwd file that we are allowed to use.
-- Could be used to check that right variable-name is used.
local availablefileds = {
['userid']=true,
['password']=true,
['username']=true,
['roles']=true,
}
return availablefileds[field]
end
-- This function returns the username and roles
-- or false on an error
get_userinfo = function ( self, userid )
local t = pvt.parse_authfile(self.conf.confdir .. "/passwd")
if t == false then
return nil
else
return pvt.get_id (userid, t)
end
end
get_userinfo_roles = function (self, userid)
local t = pvt.parse_authfile(self.conf.confdir .. "/passwd")
if t == false then
return nil
else
temp = pvt.get_id (userid, t)
return temp.roles
end
end
list_users = function (self)
local output = {}
local t = pvt.parse_authfile(self.conf.confdir .. "/passwd")
if t == false then
return nil
else
for k,v in pairs(t) do
table.insert(output,v.userid)
end
return output
end
end
list_roles = function (self)
local output = {"CREATE","UPDATE","DELETE","READ"}
return output
end
change_settings = function (self, userid,parameter,value)
-- We start by checking if user is allowed to do changes
-- FIXME: This functions is probably not done yet!!!
if not (pvt.permission_to_change) then
return false, "No permission to change!"
end
-- Check if user entered available commands
if not (userid) or not (parameter) or not (pvt.availablefields(parameter)) then
return false, "You need to enter valid userid, parameter and value!"
end
local passwdfilecontent = fs.read_file_as_array(self.conf.confdir .. "/passwd")
local changes
for k,v in pairs(passwdfilecontent) do
if ( string.match(v, "^".. userid .. ":") ) then
changes = {}
-- Get current values
changes.userid, changes.password, changes.username, changes.roles =
string.match(v, "([^:]*):([^:]*):([^:]*):(.*)")
-- Actually change the value (remove all ':')
changes[parameter] = string.gsub(value, ":", "")
-- Update the table with the new values
passwdfilecontent[k] = changes.userid .. ":" .. changes.password .. ":".. changes.username .. ":" .. changes.roles
end
end
--Write changes to file
fs.write_file(self.conf.confdir .. "/passwd", table.concat(passwdfilecontent,"\n"))
return true
end
new_settings = function ( self, userid, username, password, password_confirm, ...)
local errormessage = {}
local roles = { ... }
-- Set errormessages when entering invalid values
if (#userid == 0) then errormessage.userid = "You need to enter a valid userid!" end
if (password ~= password_confirm) then errormessage.password = "You entered wrong password/confirmation" end
if not (password) or (#password == 0) then errormessage.password = "Password cant be blank!" end
-- Return false if some errormessages is set
for k,v in pairs(errormessage) do
return false, errormessage
end
return true, errormessage
end
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