prosody
898554323338
plugins/mod_auth_ldap.lua

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plugins/mod_auth_ldap.lua @ 12314:898554323338

util.poll: Restructure to make adding additional system APIs easier
author Kim Alvefur <zash@zash.se>
date Wed, 23 Feb 2022 20:30:22 +0100
parent 11837:a37bf4497280
child 12642:9061f9621330
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
11837
a37bf4497280 mod_auth_ldap: Import from prosody-modules rev f52452911187
Kim Alvefur <zash@zash.se>
parents:
diff changeset
1 -- mod_auth_ldap
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2
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3 local jid_split = require "util.jid".split;
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4 local new_sasl = require "util.sasl".new;
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5 local lualdap = require "lualdap";
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6
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7 local function ldap_filter_escape(s)
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8 return (s:gsub("[*()\\%z]", function(c) return ("\\%02x"):format(c:byte()) end));
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9 end
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10
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11 -- Config options
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12 local ldap_server = module:get_option_string("ldap_server", "localhost");
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13 local ldap_rootdn = module:get_option_string("ldap_rootdn", "");
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14 local ldap_password = module:get_option_string("ldap_password", "");
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Kim Alvefur <zash@zash.se>
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15 local ldap_tls = module:get_option_boolean("ldap_tls");
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Kim Alvefur <zash@zash.se>
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16 local ldap_scope = module:get_option_string("ldap_scope", "subtree");
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Kim Alvefur <zash@zash.se>
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17 local ldap_filter = module:get_option_string("ldap_filter", "(uid=$user)"):gsub("%%s", "$user", 1);
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Kim Alvefur <zash@zash.se>
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18 local ldap_base = assert(module:get_option_string("ldap_base"), "ldap_base is a required option for ldap");
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19 local ldap_mode = module:get_option_string("ldap_mode", "bind");
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20 local ldap_admins = module:get_option_string("ldap_admin_filter",
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21 module:get_option_string("ldap_admins")); -- COMPAT with mistake in documentation
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22 local host = ldap_filter_escape(module:get_option_string("realm", module.host));
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23
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24 -- Initiate connection
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25 local ld = nil;
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26 module.unload = function() if ld then pcall(ld, ld.close); end end
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27
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28 function ldap_do_once(method, ...)
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29 if ld == nil then
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30 local err;
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31 ld, err = lualdap.open_simple(ldap_server, ldap_rootdn, ldap_password, ldap_tls);
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32 if not ld then return nil, err, "reconnect"; end
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33 end
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34
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35 -- luacheck: ignore 411/success
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36 local success, iterator, invariant, initial = pcall(ld[method], ld, ...);
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37 if not success then ld = nil; return nil, iterator, "search"; end
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38
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39 local success, dn, attr = pcall(iterator, invariant, initial);
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40 if not success then ld = nil; return success, dn, "iter"; end
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41
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42 return dn, attr, "return";
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43 end
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44
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45 function ldap_do(method, retry_count, ...)
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46 local dn, attr, where;
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47 for _=1,1+retry_count do
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48 dn, attr, where = ldap_do_once(method, ...);
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49 if dn or not(attr) then break; end -- nothing or something found
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50 module:log("warn", "LDAP: %s %s (in %s)", tostring(dn), tostring(attr), where);
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51 -- otherwise retry
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52 end
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53 if not dn and attr then
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54 module:log("error", "LDAP: %s", tostring(attr));
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55 end
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56 return dn, attr;
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57 end
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58
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59 function get_user(username)
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60 module:log("debug", "get_user(%q)", username);
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61 return ldap_do("search", 2, {
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62 base = ldap_base;
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63 scope = ldap_scope;
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64 sizelimit = 1;
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65 filter = ldap_filter:gsub("%$(%a+)", {
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66 user = ldap_filter_escape(username);
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67 host = host;
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68 });
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69 });
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70 end
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71
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72 local provider = {};
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73
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74 function provider.create_user(username, password) -- luacheck: ignore 212
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75 return nil, "Account creation not available with LDAP.";
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76 end
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77
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78 function provider.user_exists(username)
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79 return not not get_user(username);
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80 end
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81
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82 function provider.set_password(username, password)
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83 local dn, attr = get_user(username);
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84 if not dn then return nil, attr end
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85 if attr.userPassword == password then return true end
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86 return ldap_do("modify", 2, dn, { '=', userPassword = password });
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87 end
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88
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89 if ldap_mode == "getpasswd" then
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90 function provider.get_password(username)
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91 local dn, attr = get_user(username);
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92 if dn and attr then
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93 return attr.userPassword;
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94 end
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95 end
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96
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97 function provider.test_password(username, password)
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98 return provider.get_password(username) == password;
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99 end
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100
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101 function provider.get_sasl_handler()
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102 return new_sasl(module.host, {
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103 plain = function(sasl, username) -- luacheck: ignore 212/sasl
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104 local password = provider.get_password(username);
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105 if not password then return "", nil; end
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106 return password, true;
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107 end
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108 });
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109 end
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110 elseif ldap_mode == "bind" then
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111 local function test_password(userdn, password)
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112 local ok, err = lualdap.open_simple(ldap_server, userdn, password, ldap_tls);
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113 if not ok then
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114 module:log("debug", "ldap open_simple error: %s", err);
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115 end
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116 return not not ok;
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117 end
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118
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119 function provider.test_password(username, password)
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120 local dn = get_user(username);
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121 if not dn then return end
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122 return test_password(dn, password)
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123 end
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124
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125 function provider.get_sasl_handler()
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126 return new_sasl(module.host, {
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127 plain_test = function(sasl, username, password) -- luacheck: ignore 212/sasl
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128 return provider.test_password(username, password), true;
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129 end
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130 });
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131 end
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132 else
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133 module:log("error", "Unsupported ldap_mode %s", tostring(ldap_mode));
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134 end
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135
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136 if ldap_admins then
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137 function provider.is_admin(jid)
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138 local username, user_host = jid_split(jid);
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139 if user_host ~= module.host then
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140 return false;
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141 end
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142 return ldap_do("search", 2, {
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143 base = ldap_base;
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144 scope = ldap_scope;
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145 sizelimit = 1;
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146 filter = ldap_admins:gsub("%$(%a+)", {
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147 user = ldap_filter_escape(username);
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148 host = host;
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149 });
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150 });
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151 end
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152 end
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153
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154 module:provides("auth", provider);