plugins/mod_auth_internal_hashed.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 Waqas Hussain
   4 -- Copyright (C) 2010 Jeff Mitchell
   5 --
   6 -- This project is MIT/X11 licensed. Please see the
   7 -- COPYING file in the source package for more information.
   8 --
   9
  10 local datamanager = require "util.datamanager";
  11 local log = require "util.logger".init("usermanager");
  12 local type = type;
  13 local error = error;
  14 local ipairs = ipairs;
  15 local hashes = require "util.hashes";
  16 local jid_bare = require "util.jid".bare;
  17 local saltedPasswordSHA1 = require "util.sasl.scram".saltedPasswordSHA1;
  18 local config = require "core.configmanager";
  19 local usermanager = require "core.usermanager";
  20 local generate_uuid = require "util.uuid".generate;
  21 local new_sasl = require "util.sasl".new;
  22 local nodeprep = require "util.encodings".stringprep.nodeprep;
  23 local hosts = hosts;
  24
  25 local prosody = _G.prosody;
  26
  27 local is_cyrus = usermanager.is_cyrus;
  28
  29 -- Default; can be set per-user
  30 local iteration_count = 4096;
  31
  32 function new_hashpass_provider(host)
  33         local provider = { name = "internal_hashed" };
  34         log("debug", "initializing hashpass authentication provider for host '%s'", host);
  35
  36         function provider.test_password(username, password)
  37                 if is_cyrus(host) then return nil, "Legacy auth not supported with Cyrus SASL."; end
  38                 local credentials = datamanager.load(username, host, "accounts") or {};
  39
  40                 if credentials.password ~= nil and string.len(credentials.password) ~= 0 then
  41                         if credentials.password ~= password then
  42                                 return nil, "Auth failed. Provided password is incorrect.";
  43                         end
  44
  45                         if provider.set_password(username, credentials.password) == nil then
  46                                 return nil, "Auth failed. Could not set hashed password from plaintext.";
  47                         else
  48                                 return true;
  49                         end
  50                 end
  51
  52                 if credentials.iteration_count == nil or credentials.salt == nil or string.len(credentials.salt) == 0 then
  53                         return nil, "Auth failed. Stored salt and iteration count information is not complete.";
  54                 end
  55
  56                 local valid, binpass = saltedPasswordSHA1(password, credentials.salt, credentials.iteration_count);
  57                 local hexpass = binpass:gsub(".", function (c) return ("%02x"):format(c:byte()); end);
  58
  59                 if valid and hexpass == credentials.hashpass then
  60                         return true;
  61                 else
  62                         return nil, "Auth failed. Invalid username, password, or password hash information.";
  63                 end
  64         end
  65
  66         function provider.set_password(username, password)
  67                 if is_cyrus(host) then return nil, "Passwords unavailable for Cyrus SASL."; end
  68                 local account = datamanager.load(username, host, "accounts");
  69                 if account then
  70                         if account.iteration_count == nil then
  71                                 account.iteration_count = iteration_count;
  72                         end
  73
  74                         if account.salt == nil then
  75                                 account.salt = generate_uuid();
  76                         end
  77
  78                         local valid, binpass = saltedPasswordSHA1(password, account.salt, account.iteration_count);
  79                         local hexpass = binpass:gsub(".", function (c) return ("%02x"):format(c:byte()); end);
  80                         account.hashpass = hexpass;
  81
  82                         account.password = nil;
  83                         return datamanager.store(username, host, "accounts", account);
  84                 end
  85                 return nil, "Account not available.";
  86         end
  87
  88         function provider.user_exists(username)
  89                 if is_cyrus(host) then return true; end
  90                 local account = datamanager.load(username, host, "accounts");
  91                 if not account then
  92                         log("debug", "account not found for username '%s' at host '%s'", username, module.host);
  93                         return nil, "Auth failed. Invalid username";
  94                 end
  95                 if (account.hashpass == nil or string.len(account.hashpass) == 0) and (account.password == nil or string.len(account.password) == 0) then
  96                         log("debug", "account password not set or zero-length for username '%s' at host '%s'", username, module.host);
  97                         return nil, "Auth failed. Password invalid.";
  98                 end
  99                 return true;
 100         end
 101
 102         function provider.create_user(username, password)
 103                 if is_cyrus(host) then return nil, "Account creation/modification not available with Cyrus SASL."; end
 104                 local salt = generate_uuid();
 105                 local valid, binpass = saltedPasswordSHA1(password, salt, iteration_count);
 106                 local hexpass = binpass:gsub(".", function (c) return ("%02x"):format(c:byte()); end);
 107                 return datamanager.store(username, host, "accounts", {hashpass = hexpass, salt = salt, iteration_count = iteration_count});
 108         end
 109
 110         function provider.get_sasl_handler()
 111                 local realm = module:get_option("sasl_realm") or module.host;
 112                 local testpass_authentication_profile = {
 113                         plain_test = function(username, password, realm)
 114                                 local prepped_username = nodeprep(username);
 115                                 if not prepped_username then
 116                                         log("debug", "NODEprep failed on username: %s", username);
 117                                         return "", nil;
 118                                 end
 119                                 return usermanager.test_password(prepped_username, password, realm), true;
 120                         end,
 121                         scram_sha_1 = function(username, realm)
 122                                 local credentials = datamanager.load(username, host, "accounts") or {};
 123                                 if credentials.password then
 124                                         usermanager.set_password(username, credentials.password);
 125                                         credentials = datamanager.load(username, host, "accounts") or {};
 126                                 end
 127                                 local salted_password, iteration_count, salt = credentials.hashpass, credentials.iteration_count, credentials.salt;
 128                                 salted_password = salted_password and salted_password:gsub("..", function(x) return string.char(tonumber(x, 16)); end);
 129                                 return salted_password, iteration_count, salt, true;
 130                         end
 131                 };
 132                 return new_sasl(realm, testpass_authentication_profile);
 133         end
 134
 135         function provider.is_admin(jid)
 136                 local admins = config.get(host, "core", "admins");
 137                 if admins ~= config.get("*", "core", "admins") and type(admins) == "table" then
 138                         jid = jid_bare(jid);
 139                         for _,admin in ipairs(admins) do
 140                                 if admin == jid then return true; end
 141                         end
 142                 elseif admins then
 143                         log("error", "Option 'admins' for host '%s' is not a table", host);
 144                 end
 145                 return is_admin(jid); -- Test whether it's a global admin instead
 146         end
 147         return provider;
 148 end
 149
 150 module:add_item("auth-provider", new_hashpass_provider(module.host));
 151