prosody-modules
05685fd07395
mod_auth_external/mod_auth_external.lua

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mod_auth_external/mod_auth_external.lua @ 1160:05685fd07395

mod_auth_external: Re-organise initialization a bit (superficial)
author Matthew Wild <mwild1@gmail.com>
date Wed, 14 Aug 2013 02:27:04 +0100
parent 1159:c56a1d449cad
child 1161:b9e4d935867c
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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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13 local usermanager = require "core.usermanager";
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14 local new_sasl = require "util.sasl".new;
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15 local server = require "net.server";
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16 local have_async, async = pcall(require, "util.async");
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17
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18 local log = module._log;
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19 local host = module.host;
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21 local script_type = module:get_option_string("external_auth_protocol", "generic");
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22 assert(script_type == "ejabberd" or script_type == "generic", "Config error: external_auth_protocol must be 'ejabberd' or 'generic'");
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23 local command = module:get_option_string("external_auth_command", "");
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24 local read_timeout = module:get_option_number("external_auth_timeout", 5);
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25 assert(not host:find(":"), "Invalid hostname");
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27 local blocking = module:get_option_boolean("external_auth_blocking", not(have_async and server.event and lpty.getfd));
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29 if not blocking then
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30 log("debug", "External auth in non-blocking mode, yay!")
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31 waiter, guard = async.waiter, async.guarder();
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32 end
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34 local ptys = { lpty.new({ throw_errors = false, no_local_echo = true, use_path = false }) };
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35
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36 function send_query(text)
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37 local pty = ptys[1];
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39 local finished_with_pty
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40 if not blocking then
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41 finished_with_pty = guard(pty); -- Prevent others from crossing this line while we're busy
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42 end
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43 if not pty:hasproc() then
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44 local status, ret = pty:exitstatus();
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45 if status and (status ~= "exit" or ret ~= 0) then
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46 log("warn", "Auth process exited unexpectedly with %s %d, restarting", status, ret or 0);
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47 return nil;
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48 end
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49 local ok, err = pty:startproc(command);
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50 if not ok then
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51 log("error", "Failed to start auth process '%s': %s", command, err);
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52 return nil;
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53 end
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54 log("debug", "Started auth process");
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55 end
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56
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57 pty:send(text);
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58 if blocking then
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59 return pty:read(read_timeout);
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60 else
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61 local response;
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62 local wait, done = waiter();
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63 server.addevent(pty:getfd(), server.event.EV_READ, function ()
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64 response = pty:read();
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65 done();
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66 return -1;
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67 end);
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68 wait();
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69 finished_with_pty();
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70 return response;
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71 end
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72 end
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73
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74 function do_query(kind, username, password)
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75 if not username then return nil, "not-acceptable"; end
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76
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77 local query = (password and "%s:%s:%s:%s" or "%s:%s:%s"):format(kind, username, host, password);
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78 local len = #query
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79 if len > 1000 then return nil, "policy-violation"; end
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80
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81 if script_type == "ejabberd" then
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82 local lo = len % 256;
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83 local hi = (len - lo) / 256;
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84 query = string.char(hi, lo)..query;
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85 end
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86 if script_type == "generic" then
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87 query = query..'\n';
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88 end
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89
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90 local response, err = send_query(query);
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91 if not response then
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92 log("warn", "Error while waiting for result from auth process: %s", err or "unknown error");
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93 elseif (script_type == "ejabberd" and response == "\0\2\0\0") or
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94 (script_type == "generic" and response:gsub("\r?\n$", "") == "0") then
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95 return nil, "not-authorized";
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96 elseif (script_type == "ejabberd" and response == "\0\2\0\1") or
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97 (script_type == "generic" and response:gsub("\r?\n$", "") == "1") then
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98 return true;
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99 else
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100 log("warn", "Unable to interpret data from auth process, %s", (response:match("^error:") and response) or ("["..#response.." bytes]"));
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101 return nil, "internal-server-error";
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102 end
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103 end
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104
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105 local host = module.host;
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106 local provider = {};
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107
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108 function provider.test_password(username, password)
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109 return do_query("auth", username, password);
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110 end
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111
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112 function provider.set_password(username, password)
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113 return do_query("setpass", username, password);
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114 end
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115
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116 function provider.user_exists(username)
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117 return do_query("isuser", username);
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118 end
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119
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120 function provider.create_user(username, password) return nil, "Account creation/modification not available."; end
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121
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122 function provider.get_sasl_handler()
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123 local testpass_authentication_profile = {
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124 plain_test = function(sasl, username, password, realm)
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125 return usermanager.test_password(username, realm, password), true;
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126 end,
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127 };
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128 return new_sasl(host, testpass_authentication_profile);
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129 end
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130
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131 module:provides("auth", provider);