builtin/game/auth.lua

   1 -- Minetest: builtin/auth.lua
   2
   3 --
   4 -- Builtin authentication handler
   5 --
   6
   7 -- Make the auth object private, deny access to mods
   8 local core_auth = core.auth
   9 core.auth = nil
  10
  11 core.builtin_auth_handler = {
  12         get_auth = function(name)
  13                 assert(type(name) == "string")
  14                 local auth_entry = core_auth.read(name)
  15                 -- If no such auth found, return nil
  16                 if not auth_entry then
  17                         return nil
  18                 end
  19                 -- Figure out what privileges the player should have.
  20                 -- Take a copy of the privilege table
  21                 local privileges = {}
  22                 for priv, _ in pairs(auth_entry.privileges) do
  23                         privileges[priv] = true
  24                 end
  25                 -- If singleplayer, give all privileges except those marked as give_to_singleplayer = false
  26                 if core.is_singleplayer() then
  27                         for priv, def in pairs(core.registered_privileges) do
  28                                 if def.give_to_singleplayer then
  29                                         privileges[priv] = true
  30                                 end
  31                         end
  32                 -- For the admin, give everything
  33                 elseif name == core.settings:get("name") then
  34                         for priv, def in pairs(core.registered_privileges) do
  35                                 if def.give_to_admin then
  36                                         privileges[priv] = true
  37                                 end
  38                         end
  39                 end
  40                 -- All done
  41                 return {
  42                         password = auth_entry.password,
  43                         privileges = privileges,
  44                         -- Is set to nil if unknown
  45                         last_login = auth_entry.last_login,
  46                 }
  47         end,
  48         create_auth = function(name, password)
  49                 assert(type(name) == "string")
  50                 assert(type(password) == "string")
  51                 core.log('info', "Built-in authentication handler adding player '"..name.."'")
  52                 return core_auth.create({
  53                         name = name,
  54                         password = password,
  55                         privileges = core.string_to_privs(core.settings:get("default_privs")),
  56                         last_login = os.time(),
  57                 })
  58         end,
  59         delete_auth = function(name)
  60                 assert(type(name) == "string")
  61                 local auth_entry = core_auth.read(name)
  62                 if not auth_entry then
  63                         return false
  64                 end
  65                 core.log('info', "Built-in authentication handler deleting player '"..name.."'")
  66                 return core_auth.delete(name)
  67         end,
  68         set_password = function(name, password)
  69                 assert(type(name) == "string")
  70                 assert(type(password) == "string")
  71                 local auth_entry = core_auth.read(name)
  72                 if not auth_entry then
  73                         core.builtin_auth_handler.create_auth(name, password)
  74                 else
  75                         core.log('info', "Built-in authentication handler setting password of player '"..name.."'")
  76                         auth_entry.password = password
  77                         core_auth.save(auth_entry)
  78                 end
  79                 return true
  80         end,
  81         set_privileges = function(name, privileges)
  82                 assert(type(name) == "string")
  83                 assert(type(privileges) == "table")
  84                 local auth_entry = core_auth.read(name)
  85                 if not auth_entry then
  86                         auth_entry = core.builtin_auth_handler.create_auth(name,
  87                                 core.get_password_hash(name,
  88                                         core.settings:get("default_password")))
  89                 end
  90
  91                 -- Run grant callbacks
  92                 for priv, _ in pairs(privileges) do
  93                         if not auth_entry.privileges[priv] then
  94                                 core.run_priv_callbacks(name, priv, nil, "grant")
  95                         end
  96                 end
  97
  98                 -- Run revoke callbacks
  99                 for priv, _ in pairs(auth_entry.privileges) do
 100                         if not privileges[priv] then
 101                                 core.run_priv_callbacks(name, priv, nil, "revoke")
 102                         end
 103                 end
 104
 105                 auth_entry.privileges = privileges
 106                 core_auth.save(auth_entry)
 107                 core.notify_authentication_modified(name)
 108         end,
 109         reload = function()
 110                 core_auth.reload()
 111                 return true
 112         end,
 113         record_login = function(name)
 114                 assert(type(name) == "string")
 115                 local auth_entry = core_auth.read(name)
 116                 assert(auth_entry)
 117                 auth_entry.last_login = os.time()
 118                 core_auth.save(auth_entry)
 119         end,
 120         iterate = function()
 121                 local names = {}
 122                 local nameslist = core_auth.list_names()
 123                 for k,v in pairs(nameslist) do
 124                         names[v] = true
 125                 end
 126                 return pairs(names)
 127         end,
 128 }
 129
 130 core.register_on_prejoinplayer(function(name, ip)
 131         if core.registered_auth_handler ~= nil then
 132                 return -- Don't do anything if custom auth handler registered
 133         end
 134         local auth_entry = core_auth.read(name)
 135         if auth_entry ~= nil then
 136                 return
 137         end
 138
 139         local name_lower = name:lower()
 140         for k in core.builtin_auth_handler.iterate() do
 141                 if k:lower() == name_lower then
 142                         return string.format("\nCannot create new player called '%s'. "..
 143                                         "Another account called '%s' is already registered. "..
 144                                         "Please check the spelling if it's your account "..
 145                                         "or use a different nickname.", name, k)
 146                 end
 147         end
 148 end)
 149
 150 --
 151 -- Authentication API
 152 --
 153
 154 function core.register_authentication_handler(handler)
 155         if core.registered_auth_handler then
 156                 error("Add-on authentication handler already registered by "..core.registered_auth_handler_modname)
 157         end
 158         core.registered_auth_handler = handler
 159         core.registered_auth_handler_modname = core.get_current_modname()
 160         handler.mod_origin = core.registered_auth_handler_modname
 161 end
 162
 163 function core.get_auth_handler()
 164         return core.registered_auth_handler or core.builtin_auth_handler
 165 end
 166
 167 local function auth_pass(name)
 168         return function(...)
 169                 local auth_handler = core.get_auth_handler()
 170                 if auth_handler[name] then
 171                         return auth_handler[name](...)
 172                 end
 173                 return false
 174         end
 175 end
 176
 177 core.set_player_password = auth_pass("set_password")
 178 core.set_player_privs    = auth_pass("set_privileges")
 179 core.remove_player_auth  = auth_pass("delete_auth")
 180 core.auth_reload         = auth_pass("reload")
 181
 182 local record_login = auth_pass("record_login")
 183 core.register_on_joinplayer(function(player)
 184         record_login(player:get_player_name())
 185 end)