prosody-modules
50ee38e95e75
mod_auth_external/mod_auth_external.lua

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mod_auth_external/mod_auth_external.lua @ 1086:50ee38e95e75

Don't store password in temporary file, pipe instead
author Mikael Nordfeldth <mmn@hethane.se>
date Mon, 24 Jun 2013 14:29:03 +0200
parent 902:490cb9161c81
child 1154:61f95bf51b35
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 --
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2 -- NOTE: currently this uses lpc; when waqas fixes process, it can go back to that
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3 --
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4 -- Prosody IM
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5 -- Copyright (C) 2010 Waqas Hussain
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6 -- Copyright (C) 2010 Jeff Mitchell
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7 -- Copyright (C) 2013 Mikael Nordfeldth
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8 --
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9 -- This project is MIT/X11 licensed. Please see the
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10 -- COPYING file in the source package for more information.
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11 --
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14 --local process = require "process";
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15 local lpc; pcall(function() lpc = require "lpc"; end);
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16
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17 local config = require "core.configmanager";
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18 local log = module._log;
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19 local host = module.host;
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20 local script_type = config.get(host, "core", "external_auth_protocol") or "generic";
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21 assert(script_type == "ejabberd" or script_type == "generic");
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22 local command = config.get(host, "core", "external_auth_command") or "";
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23 assert(type(command) == "string");
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24 assert(not host:find(":"));
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25 local usermanager = require "core.usermanager";
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26 local jid_bare = require "util.jid".bare;
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27 local new_sasl = require "util.sasl".new;
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28
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29 local function send_query(text)
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30 local tmpname = os.tmpname();
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31 local p = io.popen(command.." > "..tmpname, "w"); -- dump result to file
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32 p:write(text); -- push colon-separated args through pipe to above command
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33 p:close();
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34 local tmpfile = io.open(tmpname, "r"); -- open file to read auth result
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35 local result;
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36 if script_type == "ejabberd" then
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37 result = tmpfile:read(4);
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38 elseif script_type == "generic" then
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39 result = tmpfile:read();
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40 end
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41 tmpfile:close();
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42 os.remove(tmpname); -- clean up after us
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43 return result;
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44 end
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45
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46 if lpc then
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47 --local proc;
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48 local pid;
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49 local readfile;
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50 local writefile;
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51
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52 function send_query(text)
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53 if pid and lpc.wait(pid,1) ~= nil then
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54 log("debug","error, process died, force reopen");
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55 pid=nil;
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56 end
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57 if not pid then
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58 log("debug", "Opening process " .. command);
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59 -- proc = process.popen(command);
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60 pid, writefile, readfile = lpc.run(command);
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61 end
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62 -- if not proc then
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63 if not pid then
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64 log("debug", "Process failed to open");
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65 return nil;
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66 end
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67 -- proc:write(text);
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68 -- proc:flush();
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69
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70 writefile:write(text);
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71 writefile:flush();
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72 if script_type == "ejabberd" then
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73 -- return proc:read(4); -- FIXME do properly
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74 return readfile:read(4); -- FIXME do properly
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75 elseif script_type == "generic" then
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76 -- return proc:read(1);
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77 return readfile:read();
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78 end
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79 end
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80 end
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81
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82 function do_query(kind, username, password)
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83 if not username then return nil, "not-acceptable"; end
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84
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85 local query = (password and "%s:%s:%s:%s" or "%s:%s:%s"):format(kind, username, host, password);
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86 local len = #query
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87 if len > 1000 then return nil, "policy-violation"; end
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88
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89 if script_type == "ejabberd" then
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90 local lo = len % 256;
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91 local hi = (len - lo) / 256;
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92 query = string.char(hi, lo)..query;
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93 end
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94 if script_type == "generic" then
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95 query = query..'\n';
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96 end
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97
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98 local response = send_query(query);
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99 if (script_type == "ejabberd" and response == "\0\2\0\0") or
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100 (script_type == "generic" and response == "0") then
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101 return nil, "not-authorized";
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102 elseif (script_type == "ejabberd" and response == "\0\2\0\1") or
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103 (script_type == "generic" and response == "1") then
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104 return true;
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105 else
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106 log("debug", "Nonsense back");
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107 --proc:close();
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108 --proc = nil;
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109 return nil, "internal-server-error";
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110 end
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111 end
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112
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113 local host = module.host;
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114 local provider = {};
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115
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116 function provider.test_password(username, password)
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117 return do_query("auth", username, password);
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118 end
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119
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120 function provider.set_password(username, password)
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121 return do_query("setpass", username, password);
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122 end
152
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123
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124 function provider.user_exists(username)
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125 return do_query("isuser", username);
152
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126 end
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127
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128 function provider.create_user(username, password) return nil, "Account creation/modification not available."; end
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129
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130 function provider.get_sasl_handler()
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131 local testpass_authentication_profile = {
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132 plain_test = function(sasl, username, password, realm)
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133 return usermanager.test_password(username, realm, password), true;
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134 end,
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135 };
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136 return new_sasl(host, testpass_authentication_profile);
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137 end
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138
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139 function provider.is_admin(jid)
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140 local admins = config.get(host, "core", "admins");
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141 if admins ~= config.get("*", "core", "admins") then
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142 if type(admins) == "table" then
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143 jid = jid_bare(jid);
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144 for _,admin in ipairs(admins) do
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145 if admin == jid then return true; end
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146 end
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147 elseif admins then
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148 log("error", "Option 'admins' for host '%s' is not a table", host);
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149 end
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150 end
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151 return usermanager.is_admin(jid); -- Test whether it's a global admin instead
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152 end
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153
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154 module:provides("auth", provider);