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util/sasl.lua @ 2873:108ed17f1dd9
util.sasl.plain: Allow empty authzid (thanks bjc).
| author | Waqas Hussain <waqas20@gmail.com> |
|---|---|
| date | Tue, 01 Dec 2009 22:32:37 +0500 |
| parent | 2088:5a9dc066a388 |
| child | 2923:b7049746bd29 |
| rev | line source |
|---|---|
| 896 | 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 |
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15 local md5 = require "util.hashes".md5; |
| 38 | 16 local log = require "util.logger".init("sasl"); |
| 17 local tostring = tostring; | |
| 18 local st = require "util.stanza"; | |
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19 local generate_uuid = require "util.uuid".generate; |
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20 local t_insert, t_concat = table.insert, table.concat; |
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21 local to_byte, to_char = string.byte, string.char; |
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22 local to_unicode = require "util.encodings".idna.to_unicode; |
| 38 | 23 local s_match = string.match; |
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24 local gmatch = string.gmatch |
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25 local string = string |
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26 local math = require "math" |
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27 local type = type |
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28 local error = error |
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29 local print = print |
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30 |
| 38 | 31 module "sasl" |
| 32 | |
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33 -- Credentials handler: |
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34 -- Arguments: ("PLAIN", user, host, password) |
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35 -- Returns: true (success) | false (fail) | nil (user unknown) |
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36 local function new_plain(realm, credentials_handler) |
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37 local object = { mechanism = "PLAIN", realm = realm, credentials_handler = credentials_handler} |
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38 function object.feed(self, message) |
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39 if message == "" or message == nil then return "failure", "malformed-request" end |
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40 local response = message |
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41 local authorization = s_match(response, "([^%z]*)") |
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42 local authentication = s_match(response, "%z([^%z]+)%z") |
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43 local password = s_match(response, "%z[^%z]+%z([^%z]+)") |
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44 |
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45 if authentication == nil or password == nil then return "failure", "malformed-request" end |
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46 self.username = authentication |
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47 local auth_success = self.credentials_handler("PLAIN", self.username, self.realm, password) |
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48 |
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49 if auth_success then |
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50 return "success" |
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51 elseif auth_success == nil then |
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52 return "failure", "account-disabled" |
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53 else |
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54 return "failure", "not-authorized" |
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55 end |
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56 end |
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57 return object |
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58 end |
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59 |
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60 -- credentials_handler: |
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61 -- Arguments: (mechanism, node, domain, realm, decoder) |
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62 -- Returns: Password encoding, (plaintext) password |
| 1158 | 63 -- implementing RFC 2831 |
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64 local function new_digest_md5(realm, credentials_handler) |
| 1158 | 65 --TODO complete support for authzid |
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66 |
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67 local function serialize(message) |
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68 local data = "" |
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69 |
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70 if type(message) ~= "table" then error("serialize needs an argument of type table.") end |
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71 |
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72 -- testing all possible values |
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73 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end |
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74 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end |
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75 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end |
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76 if message["charset"] then data = data..[[charset=]]..message.charset.."," end |
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77 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end |
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78 if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end |
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79 data = data:gsub(",$", "") |
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80 return data |
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81 end |
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82 |
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83 local function utf8tolatin1ifpossible(passwd) |
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84 local i = 1; |
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85 while i <= #passwd do |
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86 local passwd_i = to_byte(passwd:sub(i, i)); |
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87 if passwd_i > 0x7F then |
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88 if passwd_i < 0xC0 or passwd_i > 0xC3 then |
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89 return passwd; |
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90 end |
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91 i = i + 1; |
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92 passwd_i = to_byte(passwd:sub(i, i)); |
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93 if passwd_i < 0x80 or passwd_i > 0xBF then |
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94 return passwd; |
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95 end |
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96 end |
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97 i = i + 1; |
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98 end |
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99 |
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100 local p = {}; |
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101 local j = 0; |
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102 i = 1; |
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103 while (i <= #passwd) do |
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104 local passwd_i = to_byte(passwd:sub(i, i)); |
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105 if passwd_i > 0x7F then |
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106 i = i + 1; |
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107 local passwd_i_1 = to_byte(passwd:sub(i, i)); |
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108 t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever |
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109 else |
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110 t_insert(p, to_char(passwd_i)); |
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111 end |
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112 i = i + 1; |
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113 end |
|
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114 return t_concat(p); |
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115 end |
|
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116 local function latin1toutf8(str) |
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117 local p = {}; |
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118 for ch in gmatch(str, ".") do |
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119 ch = to_byte(ch); |
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120 if (ch < 0x80) then |
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121 t_insert(p, to_char(ch)); |
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122 elseif (ch < 0xC0) then |
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123 t_insert(p, to_char(0xC2, ch)); |
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124 else |
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125 t_insert(p, to_char(0xC3, ch - 64)); |
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126 end |
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127 end |
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128 return t_concat(p); |
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129 end |
|
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130 local function parse(data) |
|
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131 local message = {} |
|
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132 -- COMPAT: %z in the pattern to work around jwchat bug (sends "charset=utf-8\0") |
|
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133 for k, v in gmatch(data, [[([%w%-]+)="?([^",%z]*)"?,?]]) do -- FIXME The hacky regex makes me shudder |
| 1160 | 134 message[k] = v; |
|
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135 end |
| 1160 | 136 return message; |
|
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137 end |
|
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138 |
|
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139 local object = { mechanism = "DIGEST-MD5", realm = realm, credentials_handler = credentials_handler}; |
|
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140 |
| 1160 | 141 object.nonce = generate_uuid(); |
| 142 object.step = 0; | |
| 143 object.nonce_count = {}; | |
|
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144 |
|
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145 function object.feed(self, message) |
| 1160 | 146 self.step = self.step + 1; |
|
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147 if (self.step == 1) then |
|
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148 local challenge = serialize({ nonce = object.nonce, |
|
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149 qop = "auth", |
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150 charset = "utf-8", |
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151 algorithm = "md5-sess", |
|
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152 realm = self.realm}); |
| 1160 | 153 return "challenge", challenge; |
|
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154 elseif (self.step == 2) then |
| 1160 | 155 local response = parse(message); |
|
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156 -- check for replay attack |
|
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157 if response["nc"] then |
|
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158 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end |
|
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159 end |
|
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160 |
|
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161 -- check for username, it's REQUIRED by RFC 2831 |
|
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162 if not response["username"] then |
| 1160 | 163 return "failure", "malformed-request"; |
|
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164 end |
| 1160 | 165 self["username"] = response["username"]; |
|
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166 |
|
294
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167 -- check for nonce, ... |
|
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168 if not response["nonce"] then |
| 1160 | 169 return "failure", "malformed-request"; |
|
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170 else |
|
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171 -- check if it's the right nonce |
|
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172 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end |
|
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173 end |
|
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|
174 |
|
297
15b375870b40
Providing some human readable error messages and some fixes.
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294
diff
changeset
|
175 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end |
|
294
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|
176 if not response["qop"] then response["qop"] = "auth" end |
|
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177 |
|
702
d344860fdada
sasl: Set realm to be the current realm when the client didn't send a realm, or sent an empty one
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diff
changeset
|
178 if response["realm"] == nil or response["realm"] == "" then |
|
1376
13587cf24435
Adjust PLAIN and DIGEST-MD5 mechanisms to new password_handler API.
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1374
diff
changeset
|
179 response["realm"] = ""; |
|
702
d344860fdada
sasl: Set realm to be the current realm when the client didn't send a realm, or sent an empty one
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diff
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|
180 elseif response["realm"] ~= self.realm then |
|
602
a977227aa9e6
Return error when the given realm value does not match the sent realm value. Prevents impersonation of an account on one virtual host, but a user with the same username on another host.
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diff
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|
181 return "failure", "not-authorized", "Incorrect realm value"; |
|
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Return error when the given realm value does not match the sent realm value. Prevents impersonation of an account on one virtual host, but a user with the same username on another host.
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diff
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|
182 end |
|
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183 |
|
599
30655c5cc531
Latin1 support for SASL DIGEST-MD5 (second, and possibly final commit)
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diff
changeset
|
184 local decoder; |
|
508
4fd60ae97535
Converting latin encoded responsed to utf-8 when needed.
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parents:
507
diff
changeset
|
185 if response["charset"] == nil then |
|
599
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Latin1 support for SASL DIGEST-MD5 (second, and possibly final commit)
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diff
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|
186 decoder = utf8tolatin1ifpossible; |
|
508
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diff
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|
187 elseif response["charset"] ~= "utf-8" then |
| 1160 | 188 return "failure", "incorrect-encoding", "The client's response uses "..response["charset"].." for encoding with isn't supported by sasl.lua. Supported encodings are latin or utf-8."; |
|
508
4fd60ae97535
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507
diff
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|
189 end |
|
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|
190 |
| 1160 | 191 local domain = ""; |
| 192 local protocol = ""; | |
|
294
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diff
changeset
|
193 if response["digest-uri"] then |
| 1160 | 194 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$"); |
|
402
50f1c09541cd
Checking some variables for nil so no errors occur that'll break the server.
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parents:
401
diff
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|
195 if protocol == nil or domain == nil then return "failure", "malformed-request" end |
|
294
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diff
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|
196 else |
|
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|
197 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message." |
|
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|
198 end |
|
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|
199 |
|
294
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diff
changeset
|
200 --TODO maybe realm support |
| 1160 | 201 self.username = response["username"]; |
|
1656
cf9220a364cd
Fixing a SASL issue by always passing the realm from SASL framework init to the handlers.
Tobias Markmann <tm@ayena.de>
parents:
1585
diff
changeset
|
202 local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder); |
| 405 | 203 if Y == nil then return "failure", "not-authorized" |
|
404
4801dbeccc2a
Some changes to report more correct SASL failures. Support for disabled accounts.
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parents:
402
diff
changeset
|
204 elseif Y == false then return "failure", "account-disabled" end |
|
1159
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Adding minimal support for authorization identities to workaround buggy SASL implementations.
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1158
diff
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|
205 local A1 = ""; |
|
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diff
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|
206 if response.authzid then |
|
2079
5334723fa24d
util.sasl: Allow authzid=username (for compatibility with Smack's non-compliant behavior).
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2078
diff
changeset
|
207 if response.authzid == self.username or response.authzid == self.username.."@"..self.realm then |
| 1374 | 208 -- COMPAT |
|
2080
ca419b92a8c7
util.sasl: Improved a log message.
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2079
diff
changeset
|
209 log("warn", "Client is violating RFC 3920 (section 6.1, point 7)."); |
|
1159
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|
210 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid; |
|
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diff
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|
211 else |
|
2078
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util.sasl: Return proper error when client provides authzid.
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diff
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|
212 return "failure", "invalid-authzid"; |
|
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|
213 end |
|
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|
214 else |
|
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|
215 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]; |
|
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diff
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|
216 end |
|
603
423fd24fff54
Removed the unnecessary idna.to_ascii applied to the DIGEST-MD5 disgest-uri response values, which was causing auth failures with some clients.
Waqas Hussain <waqas20@gmail.com>
parents:
602
diff
changeset
|
217 local A2 = "AUTHENTICATE:"..protocol.."/"..domain; |
|
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218 |
| 1160 | 219 local HA1 = md5(A1, true); |
| 220 local HA2 = md5(A2, true); | |
|
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|
221 |
| 1160 | 222 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2; |
| 223 local response_value = md5(KD, true); | |
|
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|
224 |
|
294
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diff
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|
225 if response_value == response["response"] then |
|
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|
226 -- calculate rspauth |
|
603
423fd24fff54
Removed the unnecessary idna.to_ascii applied to the DIGEST-MD5 disgest-uri response values, which was causing auth failures with some clients.
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602
diff
changeset
|
227 A2 = ":"..protocol.."/"..domain; |
|
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diff
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|
228 |
| 1160 | 229 HA1 = md5(A1, true); |
| 230 HA2 = md5(A2, true); | |
|
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Switch to using a more generic credentials_callback/handler for SASL auth.
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diff
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|
231 |
|
294
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diff
changeset
|
232 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2 |
| 1160 | 233 local rspauth = md5(KD, true); |
| 234 self.authenticated = true; | |
| 235 return "challenge", serialize({rspauth = rspauth}); | |
|
294
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|
236 else |
|
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237 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated." |
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238 end |
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239 elseif self.step == 3 then |
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240 if self.authenticated ~= nil then return "success" |
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241 else return "failure", "malformed-request" end |
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242 end |
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243 end |
| 1160 | 244 return object; |
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245 end |
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246 |
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247 -- Credentials handler: Can be nil. If specified, should take the mechanism as |
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248 -- the only argument, and return true for OK, or false for not-OK (TODO) |
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249 local function new_anonymous(realm, credentials_handler) |
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250 local object = { mechanism = "ANONYMOUS", realm = realm, credentials_handler = credentials_handler} |
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251 function object.feed(self, message) |
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252 return "success" |
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253 end |
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254 object["username"] = generate_uuid() |
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255 return object |
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256 end |
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257 |
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258 |
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259 function new(mechanism, realm, credentials_handler) |
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260 local object |
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261 if mechanism == "PLAIN" then object = new_plain(realm, credentials_handler) |
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262 elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, credentials_handler) |
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263 elseif mechanism == "ANONYMOUS" then object = new_anonymous(realm, credentials_handler) |
| 38 | 264 else |
| 265 log("debug", "Unsupported SASL mechanism: "..tostring(mechanism)); | |
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266 return nil |
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267 end |
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268 return object |
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269 end |
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270 |
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271 return _M; |
