prosody
638f627e707f
plugins/mod_auth_ldap.lua

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plugins/mod_auth_ldap.lua @ 13134:638f627e707f

util.datamanager: Add O(1) list indexing with on-disk index Index file contains offsets and lengths of each item() which allows seeking directly to each item and reading it without parsing the entire file. Also allows tricks like binary search, assuming items have some defined order. We take advantage of the 1-based indexing in tables to store a magic header in the 0 position, so that table index 1 ends up at file index 1.
author Kim Alvefur <zash@zash.se>
date Tue, 11 May 2021 02:09:56 +0200
parent 12977:74b9e05af71e
child 13224:71c28b36923f
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1 -- mod_auth_ldap
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2
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3 local new_sasl = require "prosody.util.sasl".new;
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4 local lualdap = require "lualdap";
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5
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6 local function ldap_filter_escape(s)
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7 return (s:gsub("[*()\\%z]", function(c) return ("\\%02x"):format(c:byte()) end));
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8 end
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9
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10 -- Config options
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11 local ldap_server = module:get_option_string("ldap_server", "localhost");
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12 local ldap_rootdn = module:get_option_string("ldap_rootdn", "");
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13 local ldap_password = module:get_option_string("ldap_password", "");
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14 local ldap_tls = module:get_option_boolean("ldap_tls");
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15 local ldap_scope = module:get_option_string("ldap_scope", "subtree");
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16 local ldap_filter = module:get_option_string("ldap_filter", "(uid=$user)"):gsub("%%s", "$user", 1);
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17 local ldap_base = assert(module:get_option_string("ldap_base"), "ldap_base is a required option for ldap");
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18 local ldap_mode = module:get_option_string("ldap_mode", "bind");
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19 local ldap_admins = module:get_option_string("ldap_admin_filter",
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20 module:get_option_string("ldap_admins")); -- COMPAT with mistake in documentation
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21 local host = ldap_filter_escape(module:get_option_string("realm", module.host));
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22
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23 if ldap_admins then
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24 module:log("error", "The 'ldap_admin_filter' option has been deprecated, "..
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25 "and will be ignored. Equivalent functionality may be added in "..
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26 "the future if there is demand."
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27 );
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28 end
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29
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30 -- Initiate connection
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31 local ld = nil;
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32 module.unload = function() if ld then pcall(ld, ld.close); end end
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33
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34 function ldap_do_once(method, ...)
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35 if ld == nil then
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36 local err;
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37 ld, err = lualdap.open_simple(ldap_server, ldap_rootdn, ldap_password, ldap_tls);
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38 if not ld then return nil, err, "reconnect"; end
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39 end
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40
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41 -- luacheck: ignore 411/success
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42 local success, iterator, invariant, initial = pcall(ld[method], ld, ...);
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43 if not success then ld = nil; return nil, iterator, "search"; end
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44
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45 local success, dn, attr = pcall(iterator, invariant, initial);
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46 if not success then ld = nil; return success, dn, "iter"; end
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47
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48 return dn, attr, "return";
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49 end
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50
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51 function ldap_do(method, retry_count, ...)
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52 local dn, attr, where;
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53 for _=1,1+retry_count do
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54 dn, attr, where = ldap_do_once(method, ...);
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55 if dn or not(attr) then break; end -- nothing or something found
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56 module:log("warn", "LDAP: %s %s (in %s)", tostring(dn), tostring(attr), where);
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57 -- otherwise retry
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58 end
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59 if not dn and attr then
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60 module:log("error", "LDAP: %s", tostring(attr));
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61 end
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62 return dn, attr;
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63 end
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64
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65 function get_user(username)
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66 module:log("debug", "get_user(%q)", username);
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67 return ldap_do("search", 2, {
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68 base = ldap_base;
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69 scope = ldap_scope;
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70 sizelimit = 1;
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71 filter = ldap_filter:gsub("%$(%a+)", {
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72 user = ldap_filter_escape(username);
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73 host = host;
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74 });
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75 });
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76 end
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77
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78 local provider = {};
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79
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80 function provider.create_user(username, password) -- luacheck: ignore 212
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81 return nil, "Account creation not available with LDAP.";
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82 end
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83
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84 function provider.user_exists(username)
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85 return not not get_user(username);
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86 end
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87
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88 function provider.set_password(username, password)
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89 local dn, attr = get_user(username);
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90 if not dn then return nil, attr end
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91 if attr.userPassword == password then return true end
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92 return ldap_do("modify", 2, dn, { '=', userPassword = password });
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93 end
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94
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95 if ldap_mode == "getpasswd" then
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96 function provider.get_password(username)
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97 local dn, attr = get_user(username);
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98 if dn and attr then
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99 return attr.userPassword;
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100 end
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101 end
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102
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103 function provider.test_password(username, password)
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104 return provider.get_password(username) == password;
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105 end
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106
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107 function provider.get_sasl_handler()
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108 return new_sasl(module.host, {
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109 plain = function(sasl, username) -- luacheck: ignore 212/sasl
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110 local password = provider.get_password(username);
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111 if not password then return "", nil; end
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112 return password, true;
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113 end
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114 });
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115 end
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116 elseif ldap_mode == "bind" then
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117 local function test_password(userdn, password)
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118 local ok, err = lualdap.open_simple(ldap_server, userdn, password, ldap_tls);
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119 if not ok then
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120 module:log("debug", "ldap open_simple error: %s", err);
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121 end
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122 return not not ok;
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123 end
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124
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125 function provider.test_password(username, password)
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126 local dn = get_user(username);
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127 if not dn then return end
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128 return test_password(dn, password)
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129 end
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130
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131 function provider.get_sasl_handler()
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132 return new_sasl(module.host, {
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133 plain_test = function(sasl, username, password) -- luacheck: ignore 212/sasl
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134 return provider.test_password(username, password), true;
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135 end
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136 });
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137 end
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138 else
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139 module:log("error", "Unsupported ldap_mode %s", tostring(ldap_mode));
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140 end
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141
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142 module:provides("auth", provider);