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f4341cac3ae1
util/sasl_cyrus.lua

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util/sasl_cyrus.lua @ 3106:f4341cac3ae1

util.sasl.scram: Fixing issue #177.
author Tobias Markmann <tm@ayena.de>
date Sat, 22 May 2010 20:51:01 +0200
parent 3063:ca149818083d
child 3157:174f3cfe86ff
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- sasl.lua v0.4
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2 -- Copyright (C) 2008-2009 Tobias Markmann
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3 --
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4 -- All rights reserved.
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5 --
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6 -- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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7 --
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8 -- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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9 -- * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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10 -- * Neither the name of Tobias Markmann nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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11 --
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12 -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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13
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14 local cyrussasl = require "cyrussasl";
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15 local log = require "util.logger".init("sasl_cyrus");
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16 local array = require "util.array";
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17
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18 local tostring = tostring;
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19 local pairs, ipairs = pairs, ipairs;
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20 local t_insert, t_concat = table.insert, table.concat;
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21 local s_match = string.match;
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22 local setmetatable = setmetatable
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24 local keys = keys;
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26 local print = print
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27 local pcall = pcall
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28 local s_match, s_gmatch = string.match, string.gmatch
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29
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30 module "sasl_cyrus"
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31
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32 local method = {};
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33 method.__index = method;
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34 local initialized = false;
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35
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36 local function init(service_name)
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37 if not initialized then
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38 local st, errmsg = pcall(cyrussasl.server_init, service_name);
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39 if st then
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40 initialized = true;
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41 else
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42 log("error", "Failed to initialize Cyrus SASL: %s", errmsg);
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43 end
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44 end
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45 end
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46
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47 -- create a new SASL object which can be used to authenticate clients
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48 function new(realm, service_name, app_name)
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49 local sasl_i = {};
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50
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51 init(app_name or service_name);
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52
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53 sasl_i.realm = realm;
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54 sasl_i.service_name = service_name;
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55
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56 local st, ret = pcall(cyrussasl.server_new, service_name, nil, realm, nil, nil)
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57 if st then
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58 sasl_i.cyrus = ret;
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59 else
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60 log("error", "Creating SASL server connection failed: %s", ret);
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61 return nil;
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62 end
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63
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64 if cyrussasl.set_canon_cb then
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65 local c14n_cb = function (user)
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66 local node = s_match(user, "^([^@]+)");
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67 log("debug", "Canonicalizing username %s to %s", user, node)
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68 return node
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69 end
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70 cyrussasl.set_canon_cb(sasl_i.cyrus, c14n_cb);
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71 end
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72
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73 cyrussasl.setssf(sasl_i.cyrus, 0, 0xffffffff)
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74 local s = setmetatable(sasl_i, method);
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75 return s;
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76 end
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77
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78 -- get a fresh clone with the same realm, profiles and forbidden mechanisms
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79 function method:clean_clone()
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80 return new(self.realm, self.service_name)
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81 end
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82
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83 -- set the forbidden mechanisms
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84 function method:forbidden( restrict )
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85 log("warn", "Called method:forbidden. NOT IMPLEMENTED.")
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86 return {}
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87 end
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88
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89 -- get a list of possible SASL mechanims to use
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90 function method:mechanisms()
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91 local mechanisms = {}
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92 local cyrus_mechs = cyrussasl.listmech(self.cyrus, nil, "", " ", "")
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93 for w in s_gmatch(cyrus_mechs, "[^ ]+") do
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94 mechanisms[w] = true;
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95 end
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96 self.mechs = mechanisms
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97 return array.collect(keys(mechanisms));
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98 end
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99
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100 -- select a mechanism to use
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101 function method:select(mechanism)
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102 self.mechanism = mechanism;
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103 if not self.mechs then self:mechanisms(); end
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104 return self.mechs[mechanism];
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105 end
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106
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107 -- feed new messages to process into the library
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108 function method:process(message)
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109 local err;
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110 local data;
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111
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112 if self.mechanism then
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113 err, data = cyrussasl.server_start(self.cyrus, self.mechanism, message or "")
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114 else
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115 err, data = cyrussasl.server_step(self.cyrus, message or "")
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116 end
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117
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118 self.username = cyrussasl.get_username(self.cyrus)
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119
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120 if (err == 0) then -- SASL_OK
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121 return "success", data
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122 elseif (err == 1) then -- SASL_CONTINUE
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123 return "challenge", data
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124 elseif (err == -4) then -- SASL_NOMECH
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125 log("debug", "SASL mechanism not available from remote end")
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126 return "failure", "invalid-mechanism", "SASL mechanism not available"
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127 elseif (err == -13) then -- SASL_BADAUTH
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128 return "failure", "not-authorized", cyrussasl.get_message( self.cyrus )
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129 else
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130 log("debug", "Got SASL error condition %d", err)
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131 return "failure", "undefined-condition", cyrussasl.get_message( self.cyrus )
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132 end
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133 end
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134
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135 return _M;