prosody-modules
a7d0d129df6f
mod_auth_external/mod_auth_external.lua

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mod_auth_external/mod_auth_external.lua @ 1157:a7d0d129df6f

mod_auth_external: Log full response from pty if it appears to be an error message
author Matthew Wild <mwild1@gmail.com>
date Tue, 13 Aug 2013 21:37:05 +0100
parent 1156:3c82984ffa51
child 1158:ae1767b54964
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1 --
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2 -- Prosody IM
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3 -- Copyright (C) 2010 Waqas Hussain
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4 -- Copyright (C) 2010 Jeff Mitchell
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5 -- Copyright (C) 2013 Mikael Nordfeldth
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6 -- Copyright (C) 2013 Matthew Wild, finally came to fix it all
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7 --
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8 -- This project is MIT/X11 licensed. Please see the
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9 -- COPYING file in the source package for more information.
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10 --
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11
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12 local lpty = assert(require "lpty", "mod_auth_external requires lpty: https://code.google.com/p/prosody-modules/wiki/mod_auth_external#Installation");
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14 local log = module._log;
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15 local host = module.host;
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16 local script_type = module:get_option_string("external_auth_protocol", "generic");
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17 assert(script_type == "ejabberd" or script_type == "generic", "Config error: external_auth_protocol must be 'ejabberd' or 'generic'");
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18 local command = module:get_option_string("external_auth_command", "");
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19 local read_timeout = module:get_option_number("external_auth_timeout", 5);
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20 assert(not host:find(":"), "Invalid hostname");
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21 local usermanager = require "core.usermanager";
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22 local new_sasl = require "util.sasl".new;
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23
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24 local pty = lpty.new({ throw_errors = false, no_local_echo = true, use_path = false });
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26 function send_query(text)
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27 if not pty:hasproc() then
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28 local status, ret = pty:exitstatus();
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29 if status and (status ~= "exit" or ret ~= 0) then
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30 log("warn", "Auth process exited unexpectedly with %s %d, restarting", status, ret or 0);
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31 return nil;
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32 end
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33 local ok, err = pty:startproc(command);
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34 if not ok then
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35 log("error", "Failed to start auth process '%s': %s", command, err);
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36 return nil;
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37 end
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38 log("debug", "Started auth process");
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39 end
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41 pty:send(text);
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42 return pty:read(read_timeout);
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43 end
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44
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45 function do_query(kind, username, password)
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46 if not username then return nil, "not-acceptable"; end
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47
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48 local query = (password and "%s:%s:%s:%s" or "%s:%s:%s"):format(kind, username, host, password);
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49 local len = #query
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50 if len > 1000 then return nil, "policy-violation"; end
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51
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52 if script_type == "ejabberd" then
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53 local lo = len % 256;
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54 local hi = (len - lo) / 256;
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55 query = string.char(hi, lo)..query;
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56 end
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57 if script_type == "generic" then
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58 query = query..'\n';
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59 end
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60
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61 local response = send_query(query);
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62 if (script_type == "ejabberd" and response == "\0\2\0\0") or
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63 (script_type == "generic" and response:gsub("\r?\n$", "") == "0") then
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64 return nil, "not-authorized";
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65 elseif (script_type == "ejabberd" and response == "\0\2\0\1") or
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66 (script_type == "generic" and response:gsub("\r?\n$", "") == "1") then
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67 return true;
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68 else
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69 if response then
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70 log("warn", "Unable to interpret data from auth process, %s", (response:match("^error:") and response) or ("["..#response.." bytes]"));
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71 else
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72 log("warn", "Error while waiting for result from auth process: %s", response or "unknown error");
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73 end
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74 return nil, "internal-server-error";
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75 end
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76 end
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77
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78 local host = module.host;
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79 local provider = {};
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81 function provider.test_password(username, password)
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82 return do_query("auth", username, password);
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83 end
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84
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85 function provider.set_password(username, password)
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86 return do_query("setpass", username, password);
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87 end
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88
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89 function provider.user_exists(username)
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90 return do_query("isuser", username);
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91 end
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92
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93 function provider.create_user(username, password) return nil, "Account creation/modification not available."; end
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94
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95 function provider.get_sasl_handler()
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96 local testpass_authentication_profile = {
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97 plain_test = function(sasl, username, password, realm)
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98 return usermanager.test_password(username, realm, password), true;
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99 end,
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100 };
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101 return new_sasl(host, testpass_authentication_profile);
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102 end
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103
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104 module:provides("auth", provider);