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annotate mod_auth_external/mod_auth_external.lua @ 1159:c56a1d449cad

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mod_auth_external: Add non-blocking mode (requires trunk, libevent and lpty 1.0.1). Our first complete non-blocking auth module!
author Matthew Wild <mwild1@gmail.com>
date Tue, 13 Aug 2013 23:37:31 +0100
parents ae1767b54964
children 05685fd07395
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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 local server = require "net.server";
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24 local have_async, async = pcall(require, "util.async");
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26 local blocking = module:get_option_boolean("external_auth_blocking", not(have_async and server.event and lpty.getfd));
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28 if not blocking then
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29 log("debug", "External auth in non-blocking mode, yay!")
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30 waiter, guard = async.waiter, async.guarder();
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31 end
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33 local ptys = { lpty.new({ throw_errors = false, no_local_echo = true, use_path = false }) };
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34
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35 function send_query(text)
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36 local pty = ptys[1];
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38 local finished_with_pty
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39 if not blocking then
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40 finished_with_pty = guard(pty); -- Prevent others from crossing this line while we're busy
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41 end
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42 if not pty:hasproc() then
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43 local status, ret = pty:exitstatus();
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44 if status and (status ~= "exit" or ret ~= 0) then
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45 log("warn", "Auth process exited unexpectedly with %s %d, restarting", status, ret or 0);
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46 return nil;
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47 end
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48 local ok, err = pty:startproc(command);
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49 if not ok then
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50 log("error", "Failed to start auth process '%s': %s", command, err);
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51 return nil;
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52 end
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53 log("debug", "Started auth process");
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54 end
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55
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56 pty:send(text);
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57 if blocking then
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58 return pty:read(read_timeout);
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59 else
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60 local response;
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61 local wait, done = waiter();
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62 server.addevent(pty:getfd(), server.event.EV_READ, function ()
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63 response = pty:read();
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64 done();
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65 return -1;
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66 end);
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67 wait();
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68 finished_with_pty();
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69 return response;
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70 end
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71 end
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72
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73 function do_query(kind, username, password)
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74 if not username then return nil, "not-acceptable"; end
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75
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76 local query = (password and "%s:%s:%s:%s" or "%s:%s:%s"):format(kind, username, host, password);
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77 local len = #query
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78 if len > 1000 then return nil, "policy-violation"; end
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79
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80 if script_type == "ejabberd" then
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81 local lo = len % 256;
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82 local hi = (len - lo) / 256;
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83 query = string.char(hi, lo)..query;
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84 end
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85 if script_type == "generic" then
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86 query = query..'\n';
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87 end
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88
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89 local response, err = send_query(query);
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90 if not response then
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91 log("warn", "Error while waiting for result from auth process: %s", err or "unknown error");
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92 elseif (script_type == "ejabberd" and response == "\0\2\0\0") or
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93 (script_type == "generic" and response:gsub("\r?\n$", "") == "0") then
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94 return nil, "not-authorized";
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95 elseif (script_type == "ejabberd" and response == "\0\2\0\1") or
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96 (script_type == "generic" and response:gsub("\r?\n$", "") == "1") then
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97 return true;
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98 else
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99 log("warn", "Unable to interpret data from auth process, %s", (response:match("^error:") and response) or ("["..#response.." bytes]"));
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100 return nil, "internal-server-error";
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101 end
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102 end
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103
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104 local host = module.host;
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105 local provider = {};
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106
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107 function provider.test_password(username, password)
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108 return do_query("auth", username, password);
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109 end
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110
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111 function provider.set_password(username, password)
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112 return do_query("setpass", username, password);
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113 end
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114
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115 function provider.user_exists(username)
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116 return do_query("isuser", username);
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117 end
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118
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119 function provider.create_user(username, password) return nil, "Account creation/modification not available."; end
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120
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121 function provider.get_sasl_handler()
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122 local testpass_authentication_profile = {
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123 plain_test = function(sasl, username, password, realm)
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124 return usermanager.test_password(username, realm, password), true;
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125 end,
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126 };
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127 return new_sasl(host, testpass_authentication_profile);
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128 end
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129
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130 module:provides("auth", provider);