prosody-modules
3fb5f173f213
mod_auth_external/mod_auth_external.lua

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mod_auth_external/mod_auth_external.lua @ 2834:3fb5f173f213

mod_auth_external: Make sure processes are killed when Prosody shuts down This is needed because modules aren't unloaded during shutdown. The global server-cleanup event seems appropriate to use here.
author Kim Alvefur <zash@zash.se>
date Sat, 18 Nov 2017 01:01:59 +0100
parent 2830:92f6f82397c9
child 3388:c458f940b011
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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",
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28 "Config error: external_auth_protocol must be 'ejabberd' or 'generic'");
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29 assert(not host:find(":"), "Invalid hostname");
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32 if not blocking then
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33 log("debug", "External auth in non-blocking mode, yay!")
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34 waiter, guard = async.waiter, async.guarder();
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35 elseif auth_processes > 1 then
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36 log("warn", "external_auth_processes is greater than 1, but we are in blocking mode - reducing to 1");
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37 auth_processes = 1;
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38 end
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39
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40 local ptys = {};
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42 local pty_options = { throw_errors = false, no_local_echo = true, use_path = false };
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43 for i = 1, auth_processes do
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44 ptys[i] = lpty.new(pty_options);
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45 end
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46
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47 function module.unload()
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48 for i = 1, auth_processes do
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49 ptys[i]:endproc();
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50 end
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51 end
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53 module:hook_global("server-cleanup", module.unload);
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55 local curr_process = 0;
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56 function send_query(text)
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57 curr_process = (curr_process%auth_processes)+1;
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58 local pty = ptys[curr_process];
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60 local finished_with_pty
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61 if not blocking then
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62 finished_with_pty = guard(pty); -- Prevent others from crossing this line while we're busy
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63 end
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64 if not pty:hasproc() then
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65 local status, ret = pty:exitstatus();
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66 if status and (status ~= "exit" or ret ~= 0) then
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67 log("warn", "Auth process exited unexpectedly with %s %d, restarting", status, ret or 0);
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68 return nil;
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69 end
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70 local ok, err = pty:startproc(command);
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71 if not ok then
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72 log("error", "Failed to start auth process '%s': %s", command, err);
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73 return nil;
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74 end
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75 log("debug", "Started auth process");
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76 end
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77
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78 pty:send(text);
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79 if blocking then
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80 return pty:read(read_timeout);
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81 else
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82 local response;
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83 local wait, done = waiter();
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84 server.addevent(pty:getfd(), server.event.EV_READ, function ()
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85 response = pty:read();
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86 done();
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87 return -1;
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88 end);
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89 wait();
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90 finished_with_pty();
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91 return response;
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92 end
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93 end
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94
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95 function do_query(kind, username, password)
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96 if not username then return nil, "not-acceptable"; end
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97
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98 local query = (password and "%s:%s:%s:%s" or "%s:%s:%s"):format(kind, username, host, password);
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99 local len = #query
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100 if len > 1000 then return nil, "policy-violation"; end
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101
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102 if script_type == "ejabberd" then
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103 local lo = len % 256;
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104 local hi = (len - lo) / 256;
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105 query = string.char(hi, lo)..query;
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106 elseif script_type == "generic" then
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107 query = query..'\n';
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108 end
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109
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110 local response, err = send_query(query);
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111 if not response then
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112 log("warn", "Error while waiting for result from auth process: %s", err or "unknown error");
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113 elseif (script_type == "ejabberd" and response == "\0\2\0\0") or
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114 (script_type == "generic" and response:gsub("\r?\n$", "") == "0") then
158
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115 return nil, "not-authorized";
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116 elseif (script_type == "ejabberd" and response == "\0\2\0\1") or
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117 (script_type == "generic" and response:gsub("\r?\n$", "") == "1") then
158
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118 return true;
152
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119 else
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120 log("warn", "Unable to interpret data from auth process, %s",
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121 (response:match("^error:") and response) or ("["..#response.." bytes]"));
152
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122 return nil, "internal-server-error";
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123 end
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124 end
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125
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126 local provider = {};
152
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127
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128 function provider.test_password(username, password)
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129 return do_query("auth", username, password);
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130 end
152
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131
816
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132 function provider.set_password(username, password)
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133 return do_query("setpass", username, password);
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134 end
152
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135
816
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diff changeset
136 function provider.user_exists(username)
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137 return do_query("isuser", username);
152
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138 end
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parents:
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139
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parents: 2828
diff changeset
140 function provider.create_user(username, password) -- luacheck: ignore 212
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141 return nil, "Account creation/modification not available.";
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parents: 2828
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142 end
816
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143
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144 function provider.get_sasl_handler()
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145 local testpass_authentication_profile = {
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diff changeset
146 plain_test = function(sasl, username, password, realm)
902
490cb9161c81 mod_auth_{external,internal_yubikey,ldap,ldap2,sql}: No need to nodeprep in SASL handler.
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diff changeset
147 return usermanager.test_password(username, realm, password), true;
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148 end,
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149 };
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150 return new_sasl(host, testpass_authentication_profile);
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151 end
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152
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153 module:provides("auth", provider);