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annotate mod_auth_external/mod_auth_external.lua @ 2184:7155ed1fb540

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Backed out changeset f00cbfb812cd, it only half-worked and broke things
author Kim Alvefur <zash@zash.se>
date Sat, 28 May 2016 13:34:43 +0200
parents 199fb0a82c0a
children 45380b77303d
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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://modules.prosody.im/mod_auth_external.html#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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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 local command = module:get_option_string("external_auth_command", "");
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23 local read_timeout = module:get_option_number("external_auth_timeout", 5);
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24 local blocking = module:get_option_boolean("external_auth_blocking", not(have_async and server.event and lpty.getfd));
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25 local auth_processes = module:get_option_number("external_auth_processes", 1);
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27 assert(script_type == "ejabberd" or script_type == "generic", "Config error: external_auth_protocol must be 'ejabberd' or 'generic'");
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28 assert(not host:find(":"), "Invalid hostname");
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31 if not blocking then
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32 log("debug", "External auth in non-blocking mode, yay!")
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33 waiter, guard = async.waiter, async.guarder();
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34 elseif auth_processes > 1 then
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35 log("warn", "external_auth_processes is greater than 1, but we are in blocking mode - reducing to 1");
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36 auth_processes = 1;
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37 end
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39 local ptys = {};
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41 local pty_options = { throw_errors = false, no_local_echo = true, use_path = false };
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42 for i = 1, auth_processes do
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43 ptys[i] = lpty.new(pty_options);
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44 end
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46 local curr_process = 0;
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47 function send_query(text)
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48 curr_process = (curr_process%auth_processes)+1;
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49 local pty = ptys[curr_process];
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51 local finished_with_pty
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52 if not blocking then
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53 finished_with_pty = guard(pty); -- Prevent others from crossing this line while we're busy
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54 end
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55 if not pty:hasproc() then
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56 local status, ret = pty:exitstatus();
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57 if status and (status ~= "exit" or ret ~= 0) then
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58 log("warn", "Auth process exited unexpectedly with %s %d, restarting", status, ret or 0);
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59 return nil;
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60 end
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61 local ok, err = pty:startproc(command);
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62 if not ok then
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63 log("error", "Failed to start auth process '%s': %s", command, err);
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64 return nil;
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65 end
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66 log("debug", "Started auth process");
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67 end
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68
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69 pty:send(text);
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70 if blocking then
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71 return pty:read(read_timeout);
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72 else
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73 local response;
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74 local wait, done = waiter();
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75 server.addevent(pty:getfd(), server.event.EV_READ, function ()
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76 response = pty:read();
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77 done();
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78 return -1;
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79 end);
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80 wait();
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81 finished_with_pty();
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82 return response;
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83 end
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84 end
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85
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86 function do_query(kind, username, password)
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87 if not username then return nil, "not-acceptable"; end
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88
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89 local query = (password and "%s:%s:%s:%s" or "%s:%s:%s"):format(kind, username, host, password);
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90 local len = #query
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91 if len > 1000 then return nil, "policy-violation"; end
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92
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93 if script_type == "ejabberd" then
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94 local lo = len % 256;
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95 local hi = (len - lo) / 256;
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96 query = string.char(hi, lo)..query;
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97 elseif script_type == "generic" then
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98 query = query..'\n';
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99 end
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100
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101 local response, err = send_query(query);
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102 if not response then
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103 log("warn", "Error while waiting for result from auth process: %s", err or "unknown error");
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104 elseif (script_type == "ejabberd" and response == "\0\2\0\0") or
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105 (script_type == "generic" and response:gsub("\r?\n$", "") == "0") then
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106 return nil, "not-authorized";
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107 elseif (script_type == "ejabberd" and response == "\0\2\0\1") or
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108 (script_type == "generic" and response:gsub("\r?\n$", "") == "1") then
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109 return true;
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110 else
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111 log("warn", "Unable to interpret data from auth process, %s", (response:match("^error:") and response) or ("["..#response.." bytes]"));
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112 return nil, "internal-server-error";
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113 end
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114 end
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115
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116 local host = module.host;
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117 local provider = {};
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118
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119 function provider.test_password(username, password)
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120 return do_query("auth", username, password);
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121 end
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122
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123 function provider.set_password(username, password)
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124 return do_query("setpass", username, password);
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125 end
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126
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127 function provider.user_exists(username)
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128 return do_query("isuser", username);
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129 end
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130
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131 function provider.create_user(username, password) return nil, "Account creation/modification not available."; end
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132
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133 function provider.get_sasl_handler()
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134 local testpass_authentication_profile = {
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135 plain_test = function(sasl, username, password, realm)
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490cb9161c81 mod_auth_{external,internal_yubikey,ldap,ldap2,sql}: No need to nodeprep in SASL handler.
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136 return usermanager.test_password(username, realm, password), true;
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137 end,
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138 };
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139 return new_sasl(host, testpass_authentication_profile);
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140 end
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141
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142 module:provides("auth", provider);