prosody-modules
f84ede3e9e3b
mod_auth_external_insecure/mod_auth_external_insecure.lua

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mod_auth_external_insecure/mod_auth_external_insecure.lua @ 3884:f84ede3e9e3b

mod_auth_external->mod_auth_external_insecure: Unmaintained and almost certainly insecure, discourage its use
author Matthew Wild <mwild1@gmail.com>
date Thu, 06 Feb 2020 21:03:17 +0000
parent 3660:mod_auth_external/mod_auth_external.lua@11cd6e034fd3
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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", true); -- non-blocking is very experimental
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25 local auth_processes = module:get_option_number("external_auth_processes", 1);
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26
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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 assert(server.event, "External auth non-blocking mode requires libevent installed and enabled");
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34 log("debug", "External auth in non-blocking mode, yay!")
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35 waiter, guard = async.waiter, async.guarder();
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36 elseif auth_processes > 1 then
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37 log("warn", "external_auth_processes is greater than 1, but we are in blocking mode - reducing to 1");
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38 auth_processes = 1;
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39 end
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41 local ptys = {};
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43 local pty_options = { throw_errors = false, no_local_echo = true, use_path = false };
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44 for i = 1, auth_processes do
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45 ptys[i] = lpty.new(pty_options);
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46 end
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47
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48 function module.unload()
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49 for i = 1, auth_processes do
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50 ptys[i]:endproc();
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51 end
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52 end
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54 module:hook_global("server-cleanup", module.unload);
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56 local curr_process = 0;
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57 function send_query(text)
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58 curr_process = (curr_process%auth_processes)+1;
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59 local pty = ptys[curr_process];
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61 local finished_with_pty
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62 if not blocking then
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63 finished_with_pty = guard(pty); -- Prevent others from crossing this line while we're busy
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64 end
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65 if not pty:hasproc() then
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66 local status, ret = pty:exitstatus();
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67 if status and (status ~= "exit" or ret ~= 0) then
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68 log("warn", "Auth process exited unexpectedly with %s %d, restarting", status, ret or 0);
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69 return nil;
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70 end
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71 local ok, err = pty:startproc(command);
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72 if not ok then
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73 log("error", "Failed to start auth process '%s': %s", command, err);
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74 return nil;
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75 end
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76 log("debug", "Started auth process");
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77 end
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78
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79 pty:send(text);
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80 if blocking then
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81 return pty:read(read_timeout);
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82 else
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83 local response;
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84 local wait, done = waiter();
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85 server.addevent(pty:getfd(), server.event.EV_READ, function ()
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86 response = pty:read();
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87 done();
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88 return -1;
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89 end);
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90 wait();
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91 finished_with_pty();
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92 return response;
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93 end
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94 end
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95
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96 function do_query(kind, username, password)
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97 if not username then return nil, "not-acceptable"; end
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98
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99 local query = (password and "%s:%s:%s:%s" or "%s:%s:%s"):format(kind, username, host, password);
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100 local len = #query
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101 if len > 1000 then return nil, "policy-violation"; end
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102
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103 if script_type == "ejabberd" then
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104 local lo = len % 256;
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105 local hi = (len - lo) / 256;
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106 query = string.char(hi, lo)..query;
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107 elseif script_type == "generic" then
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108 query = query..'\n';
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109 end
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110
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111 local response, err = send_query(query);
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112 if not response then
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113 log("warn", "Error while waiting for result from auth process: %s", err or "unknown error");
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114 elseif (script_type == "ejabberd" and response == "\0\2\0\0") or
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115 (script_type == "generic" and response:gsub("\r?\n$", "") == "0") then
158
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116 return nil, "not-authorized";
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117 elseif (script_type == "ejabberd" and response == "\0\2\0\1") or
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118 (script_type == "generic" and response:gsub("\r?\n$", "") == "1") then
158
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diff changeset
119 return true;
152
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120 else
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Kim Alvefur <zash@zash.se>
parents: 1997
diff changeset
121 log("warn", "Unable to interpret data from auth process, %s",
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parents: 1997
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122 (response:match("^error:") and response) or ("["..#response.." bytes]"));
152
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123 return nil, "internal-server-error";
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124 end
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125 end
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126
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127 local provider = {};
152
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128
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129 function provider.test_password(username, password)
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130 return do_query("auth", username, password);
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131 end
152
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132
816
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133 function provider.set_password(username, password)
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134 return do_query("setpass", username, password);
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diff changeset
135 end
152
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136
816
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
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parents: 814
diff changeset
137 function provider.user_exists(username)
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138 return do_query("isuser", username);
152
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139 end
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parents:
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140
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Kim Alvefur <zash@zash.se>
parents: 2828
diff changeset
141 function provider.create_user(username, password) -- luacheck: ignore 212
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parents: 2828
diff changeset
142 return nil, "Account creation/modification not available.";
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parents: 2828
diff changeset
143 end
816
960007b0901e mod_auth_external, mod_auth_internal_yubikey: Get rid of useless wrapper function around the auth provider.
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diff changeset
144
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diff changeset
145 function provider.get_sasl_handler()
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diff changeset
146 local testpass_authentication_profile = {
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diff changeset
147 plain_test = function(sasl, username, password, realm)
902
490cb9161c81 mod_auth_{external,internal_yubikey,ldap,ldap2,sql}: No need to nodeprep in SASL handler.
Waqas Hussain <waqas20@gmail.com>
parents: 846
diff changeset
148 return usermanager.test_password(username, realm, password), true;
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diff changeset
149 end,
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diff changeset
150 };
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diff changeset
151 return new_sasl(host, testpass_authentication_profile);
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152 end
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153
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diff changeset
154 module:provides("auth", provider);