prosody-modules
61f95bf51b35
mod_auth_external/mod_auth_external.lua

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mod_auth_external/mod_auth_external.lua @ 1154:61f95bf51b35

mod_auth_external: Switch to lpty, remove file-based fallback, improve error messages and handling. Should greatly increase compatibility with scripts.
author Matthew Wild <mwild1@gmail.com>
date Tue, 13 Aug 2013 18:56:50 +0100
parent 1086:50ee38e95e75
child 1155:40f7a8d152eb
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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 jid_bare = require "util.jid".bare;
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23 local new_sasl = require "util.sasl".new;
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24
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25 local pty = lpty.new({ throw_errors = false, no_local_echo = true, use_path = false });
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27 function send_query(text)
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28 if not pty:hasproc() then
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29 local status, ret = pty:exitstatus();
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30 if status and (status ~= "exit" or ret ~= 0) then
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31 log("warn", "Auth process exited unexpectedly with %s %d, restarting", status, ret or 0);
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32 return nil;
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33 end
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34 local ok, err = pty:startproc(command);
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35 if not ok then
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36 log("error", "Failed to start auth process '%s': %s", command, err);
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37 return nil;
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38 end
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39 log("debug", "Started auth process");
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40 end
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41
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42 pty:send(text);
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43 return pty:read(read_timeout);
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44 end
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45
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46 function do_query(kind, username, password)
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47 if not username then return nil, "not-acceptable"; end
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48
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49 local query = (password and "%s:%s:%s:%s" or "%s:%s:%s"):format(kind, username, host, password);
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50 local len = #query
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51 if len > 1000 then return nil, "policy-violation"; end
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52
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53 if script_type == "ejabberd" then
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54 local lo = len % 256;
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55 local hi = (len - lo) / 256;
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56 query = string.char(hi, lo)..query;
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57 end
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58 if script_type == "generic" then
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59 query = query..'\n';
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60 end
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61
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62 local response = send_query(query);
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63 if (script_type == "ejabberd" and response == "\0\2\0\0") or
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64 (script_type == "generic" and response:gsub("\r?\n$", "") == "0") then
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65 return nil, "not-authorized";
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66 elseif (script_type == "ejabberd" and response == "\0\2\0\1") or
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67 (script_type == "generic" and response:gsub("\r?\n$", "") == "1") then
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68 return true;
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69 else
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70 if response then
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71 log("warn", "Unable to interpret data from auth process, %d bytes beginning with: %s", #response, (response:sub(1,4):gsub(".", function (c)
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72 return ("%02X "):format(c:byte());
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73 end)));
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74 else
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75 log("warn", "Error while waiting for result from auth process: %s", response or "unknown error");
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76 end
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77 return nil, "internal-server-error";
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78 end
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79 end
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80
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81 local host = module.host;
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82 local provider = {};
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83
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84 function provider.test_password(username, password)
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85 return do_query("auth", username, password);
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86 end
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87
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88 function provider.set_password(username, password)
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89 return do_query("setpass", username, password);
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90 end
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91
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92 function provider.user_exists(username)
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93 return do_query("isuser", username);
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94 end
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95
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96 function provider.create_user(username, password) return nil, "Account creation/modification not available."; end
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97
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98 function provider.get_sasl_handler()
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99 local testpass_authentication_profile = {
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100 plain_test = function(sasl, username, password, realm)
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101 return usermanager.test_password(username, realm, password), true;
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102 end,
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103 };
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104 return new_sasl(host, testpass_authentication_profile);
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105 end
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106
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107 function provider.is_admin(jid)
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108 local admins = config.get(host, "core", "admins");
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109 if admins ~= config.get("*", "core", "admins") then
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parents: 814
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110 if type(admins) == "table" then
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
Waqas Hussain <waqas20@gmail.com>
parents: 814
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111 jid = jid_bare(jid);
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
Waqas Hussain <waqas20@gmail.com>
parents: 814
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112 for _,admin in ipairs(admins) do
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
Waqas Hussain <waqas20@gmail.com>
parents: 814
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113 if admin == jid then return true; end
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
Waqas Hussain <waqas20@gmail.com>
parents: 814
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114 end
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
Waqas Hussain <waqas20@gmail.com>
parents: 814
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115 elseif admins then
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
Waqas Hussain <waqas20@gmail.com>
parents: 814
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116 log("error", "Option 'admins' for host '%s' is not a table", host);
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
Waqas Hussain <waqas20@gmail.com>
parents: 814
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117 end
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
Waqas Hussain <waqas20@gmail.com>
parents: 814
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118 end
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
Waqas Hussain <waqas20@gmail.com>
parents: 814
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119 return usermanager.is_admin(jid); -- Test whether it's a global admin instead
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
Waqas Hussain <waqas20@gmail.com>
parents: 814
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120 end
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
Waqas Hussain <waqas20@gmail.com>
parents: 814
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121
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Waqas Hussain <waqas20@gmail.com>
parents: 814
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122 module:provides("auth", provider);