aboutsummaryrefslogtreecommitdiffstats
path: root/util/sasl
diff options
context:
space:
mode:
Diffstat (limited to 'util/sasl')
-rw-r--r--util/sasl/anonymous.lua36
-rw-r--r--util/sasl/digest-md5.lua243
-rw-r--r--util/sasl/plain.lua82
-rw-r--r--util/sasl/scram.lua222
4 files changed, 583 insertions, 0 deletions
diff --git a/util/sasl/anonymous.lua b/util/sasl/anonymous.lua
new file mode 100644
index 00000000..7b5a5081
--- /dev/null
+++ b/util/sasl/anonymous.lua
@@ -0,0 +1,36 @@
+-- sasl.lua v0.4
+-- Copyright (C) 2008-2010 Tobias Markmann
+--
+-- All rights reserved.
+--
+-- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+--
+-- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+-- * 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.
+-- * 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.
+--
+-- 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.
+
+local s_match = string.match;
+
+local log = require "util.logger".init("sasl");
+local generate_uuid = require "util.uuid".generate;
+
+module "anonymous"
+
+--=========================
+--SASL ANONYMOUS according to RFC 4505
+local function anonymous(self, message)
+ local username;
+ repeat
+ username = generate_uuid();
+ until self.profile.anonymous(username, self.realm);
+ self["username"] = username;
+ return "success"
+end
+
+function init(registerMechanism)
+ registerMechanism("ANONYMOUS", {"anonymous"}, anonymous);
+end
+
+return _M; \ No newline at end of file
diff --git a/util/sasl/digest-md5.lua b/util/sasl/digest-md5.lua
new file mode 100644
index 00000000..2837148e
--- /dev/null
+++ b/util/sasl/digest-md5.lua
@@ -0,0 +1,243 @@
+-- sasl.lua v0.4
+-- Copyright (C) 2008-2010 Tobias Markmann
+--
+-- All rights reserved.
+--
+-- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+--
+-- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+-- * 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.
+-- * 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.
+--
+-- 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.
+
+local tostring = tostring;
+local type = type;
+
+local s_gmatch = string.gmatch;
+local s_match = string.match;
+local t_concat = table.concat;
+local t_insert = table.insert;
+local to_byte, to_char = string.byte, string.char;
+
+local md5 = require "util.hashes".md5;
+local log = require "util.logger".init("sasl");
+local generate_uuid = require "util.uuid".generate;
+
+module "digest-md5"
+
+--=========================
+--SASL DIGEST-MD5 according to RFC 2831
+
+--[[
+Supported Authentication Backends
+
+digest_md5:
+ function(username, domain, realm, encoding) -- domain and realm are usually the same; for some broken
+ -- implementations it's not
+ return digesthash, state;
+ end
+
+digest_md5_test:
+ function(username, domain, realm, encoding, digesthash)
+ return true or false, state;
+ end
+]]
+
+local function digest(self, message)
+ --TODO complete support for authzid
+
+ local function serialize(message)
+ local data = ""
+
+ -- testing all possible values
+ if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
+ if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
+ if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
+ if message["charset"] then data = data..[[charset=]]..message.charset.."," end
+ if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
+ if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
+ data = data:gsub(",$", "")
+ return data
+ end
+
+ local function utf8tolatin1ifpossible(passwd)
+ local i = 1;
+ while i <= #passwd do
+ local passwd_i = to_byte(passwd:sub(i, i));
+ if passwd_i > 0x7F then
+ if passwd_i < 0xC0 or passwd_i > 0xC3 then
+ return passwd;
+ end
+ i = i + 1;
+ passwd_i = to_byte(passwd:sub(i, i));
+ if passwd_i < 0x80 or passwd_i > 0xBF then
+ return passwd;
+ end
+ end
+ i = i + 1;
+ end
+
+ local p = {};
+ local j = 0;
+ i = 1;
+ while (i <= #passwd) do
+ local passwd_i = to_byte(passwd:sub(i, i));
+ if passwd_i > 0x7F then
+ i = i + 1;
+ local passwd_i_1 = to_byte(passwd:sub(i, i));
+ t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever
+ else
+ t_insert(p, to_char(passwd_i));
+ end
+ i = i + 1;
+ end
+ return t_concat(p);
+ end
+ local function latin1toutf8(str)
+ local p = {};
+ for ch in s_gmatch(str, ".") do
+ ch = to_byte(ch);
+ if (ch < 0x80) then
+ t_insert(p, to_char(ch));
+ elseif (ch < 0xC0) then
+ t_insert(p, to_char(0xC2, ch));
+ else
+ t_insert(p, to_char(0xC3, ch - 64));
+ end
+ end
+ return t_concat(p);
+ end
+ local function parse(data)
+ local message = {}
+ -- COMPAT: %z in the pattern to work around jwchat bug (sends "charset=utf-8\0")
+ for k, v in s_gmatch(data, [[([%w%-]+)="?([^",%z]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
+ message[k] = v;
+ end
+ return message;
+ end
+
+ if not self.nonce then
+ self.nonce = generate_uuid();
+ self.step = 0;
+ self.nonce_count = {};
+ end
+
+ self.step = self.step + 1;
+ if (self.step == 1) then
+ local challenge = serialize({ nonce = self.nonce,
+ qop = "auth",
+ charset = "utf-8",
+ algorithm = "md5-sess",
+ realm = self.realm});
+ return "challenge", challenge;
+ elseif (self.step == 2) then
+ local response = parse(message);
+ -- check for replay attack
+ if response["nc"] then
+ if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
+ end
+
+ -- check for username, it's REQUIRED by RFC 2831
+ if not response["username"] then
+ return "failure", "malformed-request";
+ end
+ self["username"] = response["username"];
+
+ -- check for nonce, ...
+ if not response["nonce"] then
+ return "failure", "malformed-request";
+ else
+ -- check if it's the right nonce
+ if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
+ end
+
+ if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
+ if not response["qop"] then response["qop"] = "auth" end
+
+ if response["realm"] == nil or response["realm"] == "" then
+ response["realm"] = "";
+ elseif response["realm"] ~= self.realm then
+ return "failure", "not-authorized", "Incorrect realm value";
+ end
+
+ local decoder;
+ if response["charset"] == nil then
+ decoder = utf8tolatin1ifpossible;
+ elseif response["charset"] ~= "utf-8" then
+ 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.";
+ end
+
+ local domain = "";
+ local protocol = "";
+ if response["digest-uri"] then
+ protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$");
+ if protocol == nil or domain == nil then return "failure", "malformed-request" end
+ else
+ return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
+ end
+
+ --TODO maybe realm support
+ self.username = response["username"];
+ local Y, state;
+ if self.profile.plain then
+ local password, state = self.profile.plain(response["username"], self.realm)
+ if state == nil then return "failure", "not-authorized"
+ elseif state == false then return "failure", "account-disabled" end
+ Y = md5(response["username"]..":"..response["realm"]..":"..password);
+ elseif self.profile["digest-md5"] then
+ Y, state = self.profile["digest-md5"](response["username"], self.realm, response["realm"], response["charset"])
+ if state == nil then return "failure", "not-authorized"
+ elseif state == false then return "failure", "account-disabled" end
+ elseif self.profile["digest-md5-test"] then
+ -- TODO
+ end
+ --local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder);
+ --if Y == nil then return "failure", "not-authorized"
+ --elseif Y == false then return "failure", "account-disabled" end
+ local A1 = "";
+ if response.authzid then
+ if response.authzid == self.username or response.authzid == self.username.."@"..self.realm then
+ -- COMPAT
+ log("warn", "Client is violating RFC 3920 (section 6.1, point 7).");
+ A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid;
+ else
+ return "failure", "invalid-authzid";
+ end
+ else
+ A1 = Y..":"..response["nonce"]..":"..response["cnonce"];
+ end
+ local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
+
+ local HA1 = md5(A1, true);
+ local HA2 = md5(A2, true);
+
+ local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2;
+ local response_value = md5(KD, true);
+
+ if response_value == response["response"] then
+ -- calculate rspauth
+ A2 = ":"..protocol.."/"..domain;
+
+ HA1 = md5(A1, true);
+ HA2 = md5(A2, true);
+
+ KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
+ local rspauth = md5(KD, true);
+ self.authenticated = true;
+ --TODO: considering sending the rspauth in a success node for saving one roundtrip; allowed according to http://tools.ietf.org/html/draft-saintandre-rfc3920bis-09#section-7.3.6
+ return "challenge", serialize({rspauth = rspauth});
+ else
+ return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
+ end
+ elseif self.step == 3 then
+ if self.authenticated ~= nil then return "success"
+ else return "failure", "malformed-request" end
+ end
+end
+
+function init(registerMechanism)
+ registerMechanism("DIGEST-MD5", {"plain"}, digest);
+end
+
+return _M; \ No newline at end of file
diff --git a/util/sasl/plain.lua b/util/sasl/plain.lua
new file mode 100644
index 00000000..39821182
--- /dev/null
+++ b/util/sasl/plain.lua
@@ -0,0 +1,82 @@
+-- sasl.lua v0.4
+-- Copyright (C) 2008-2010 Tobias Markmann
+--
+-- All rights reserved.
+--
+-- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+--
+-- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+-- * 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.
+-- * 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.
+--
+-- 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.
+
+local s_match = string.match;
+local saslprep = require "util.encodings".stringprep.saslprep;
+local log = require "util.logger".init("sasl");
+
+module "plain"
+
+-- ================================
+-- SASL PLAIN according to RFC 4616
+
+--[[
+Supported Authentication Backends
+
+plain:
+ function(username, realm)
+ return password, state;
+ end
+
+plain_test:
+ function(username, realm, password)
+ return true or false, state;
+ end
+]]
+
+local function plain(self, message)
+ if not message then
+ return "failure", "malformed-request";
+ end
+
+ local authorization, authentication, password = s_match(message, "^([^%z]*)%z([^%z]+)%z([^%z]+)");
+
+ if not authorization then
+ return "failure", "malformed-request";
+ end
+
+ -- SASLprep password and authentication
+ authentication = saslprep(authentication);
+ password = saslprep(password);
+
+ if (not password) or (password == "") or (not authentication) or (authentication == "") then
+ log("debug", "Username or password violates SASLprep.");
+ return "failure", "malformed-request", "Invalid username or password.";
+ end
+
+ local correct, state = false, false;
+ if self.profile.plain then
+ local correct_password;
+ correct_password, state = self.profile.plain(authentication, self.realm);
+ if correct_password == password then correct = true; else correct = false; end
+ elseif self.profile.plain_test then
+ correct, state = self.profile.plain_test(authentication, self.realm, password);
+ end
+
+ self.username = authentication
+ if not state then
+ return "failure", "account-disabled";
+ end
+
+ if correct then
+ return "success";
+ else
+ return "failure", "not-authorized", "Unable to authorize you with the authentication credentials you've sent.";
+ end
+end
+
+function init(registerMechanism)
+ registerMechanism("PLAIN", {"plain", "plain_test"}, plain);
+end
+
+return _M;
diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua
new file mode 100644
index 00000000..1340423c
--- /dev/null
+++ b/util/sasl/scram.lua
@@ -0,0 +1,222 @@
+-- sasl.lua v0.4
+-- Copyright (C) 2008-2010 Tobias Markmann
+--
+-- All rights reserved.
+--
+-- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+--
+-- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+-- * 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.
+-- * 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.
+--
+-- 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.
+
+local s_match = string.match;
+local type = type
+local string = string
+local base64 = require "util.encodings".base64;
+local hmac_sha1 = require "util.hmac".sha1;
+local sha1 = require "util.hashes".sha1;
+local generate_uuid = require "util.uuid".generate;
+local saslprep = require "util.encodings".stringprep.saslprep;
+local log = require "util.logger".init("sasl");
+local t_concat = table.concat;
+local char = string.char;
+local byte = string.byte;
+
+module "scram"
+
+--=========================
+--SASL SCRAM-SHA-1 according to draft-ietf-sasl-scram-10
+
+--[[
+Supported Authentication Backends
+
+scram_{MECH}:
+ -- MECH being a standard hash name (like those at IANA's hash registry) with '-' replaced with '_'
+ function(username, realm)
+ return salted_password, iteration_count, salt, state;
+ end
+]]
+
+local default_i = 4096
+
+local function bp( b )
+ local result = ""
+ for i=1, b:len() do
+ result = result.."\\"..b:byte(i)
+ end
+ return result
+end
+
+local xor_map = {0;1;2;3;4;5;6;7;8;9;10;11;12;13;14;15;1;0;3;2;5;4;7;6;9;8;11;10;13;12;15;14;2;3;0;1;6;7;4;5;10;11;8;9;14;15;12;13;3;2;1;0;7;6;5;4;11;10;9;8;15;14;13;12;4;5;6;7;0;1;2;3;12;13;14;15;8;9;10;11;5;4;7;6;1;0;3;2;13;12;15;14;9;8;11;10;6;7;4;5;2;3;0;1;14;15;12;13;10;11;8;9;7;6;5;4;3;2;1;0;15;14;13;12;11;10;9;8;8;9;10;11;12;13;14;15;0;1;2;3;4;5;6;7;9;8;11;10;13;12;15;14;1;0;3;2;5;4;7;6;10;11;8;9;14;15;12;13;2;3;0;1;6;7;4;5;11;10;9;8;15;14;13;12;3;2;1;0;7;6;5;4;12;13;14;15;8;9;10;11;4;5;6;7;0;1;2;3;13;12;15;14;9;8;11;10;5;4;7;6;1;0;3;2;14;15;12;13;10;11;8;9;6;7;4;5;2;3;0;1;15;14;13;12;11;10;9;8;7;6;5;4;3;2;1;0;};
+
+local result = {};
+local function binaryXOR( a, b )
+ for i=1, #a do
+ local x, y = byte(a, i), byte(b, i);
+ local lowx, lowy = x % 16, y % 16;
+ local hix, hiy = (x - lowx) / 16, (y - lowy) / 16;
+ local lowr, hir = xor_map[lowx * 16 + lowy + 1], xor_map[hix * 16 + hiy + 1];
+ local r = hir * 16 + lowr;
+ result[i] = char(r)
+ end
+ return t_concat(result);
+end
+
+-- hash algorithm independent Hi(PBKDF2) implementation
+local function Hi(hmac, str, salt, i)
+ local Ust = hmac(str, salt.."\0\0\0\1");
+ local res = Ust;
+ for n=1,i-1 do
+ local Und = hmac(str, Ust)
+ res = binaryXOR(res, Und)
+ Ust = Und
+ end
+ return res
+end
+
+local function validate_username(username)
+ -- check for forbidden char sequences
+ for eq in username:gmatch("=(.?.?)") do
+ if eq ~= "2D" and eq ~= "3D" then
+ return false
+ end
+ end
+
+ -- replace =2D with , and =3D with =
+ username = username:gsub("=2D", ",");
+ username = username:gsub("=3D", "=");
+
+ -- apply SASLprep
+ username = saslprep(username);
+ return username;
+end
+
+local function hashprep( hashname )
+ local hash = hashname:lower()
+ hash = hash:gsub("-", "_")
+ return hash
+end
+
+function saltedPasswordSHA1(password, salt, iteration_count)
+ local salted_password
+ if type(password) ~= "string" or type(salt) ~= "string" or type(iteration_count) ~= "number" then
+ return false, "inappropriate argument types"
+ end
+ if iteration_count < 4096 then
+ log("warn", "Iteration count < 4096 which is the suggested minimum according to RFC 5802.")
+ end
+
+ return true, Hi(hmac_sha1, password, salt, iteration_count);
+end
+
+local function scram_gen(hash_name, H_f, HMAC_f)
+ local function scram_hash(self, message)
+ if not self.state then self["state"] = {} end
+
+ if type(message) ~= "string" or #message == 0 then return "failure", "malformed-request" end
+ if not self.state.name then
+ -- we are processing client_first_message
+ local client_first_message = message;
+
+ -- TODO: fail if authzid is provided, since we don't support them yet
+ self.state["client_first_message"] = client_first_message;
+ self.state["gs2_cbind_flag"], self.state["authzid"], self.state["name"], self.state["clientnonce"]
+ = client_first_message:match("^(%a),(.*),n=(.*),r=([^,]*).*");
+
+ -- we don't do any channel binding yet
+ if self.state.gs2_cbind_flag ~= "n" and self.state.gs2_cbind_flag ~= "y" then
+ return "failure", "malformed-request";
+ end
+
+ if not self.state.name or not self.state.clientnonce then
+ return "failure", "malformed-request", "Channel binding isn't support at this time.";
+ end
+
+ self.state.name = validate_username(self.state.name);
+ if not self.state.name then
+ log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
+ return "failure", "malformed-request", "Invalid username.";
+ end
+
+ self.state["servernonce"] = generate_uuid();
+
+ -- retreive credentials
+ if self.profile.plain then
+ local password, state = self.profile.plain(self.state.name, self.realm)
+ if state == nil then return "failure", "not-authorized"
+ elseif state == false then return "failure", "account-disabled" end
+
+ password = saslprep(password);
+ if not password then
+ log("debug", "Password violates SASLprep.");
+ return "failure", "not-authorized", "Invalid password."
+ end
+
+ self.state.salt = generate_uuid();
+ self.state.iteration_count = default_i;
+
+ local succ = false;
+ succ, self.state.salted_password = saltedPasswordSHA1(password, self.state.salt, default_i, self.state.iteration_count);
+ if not succ then
+ log("error", "Generating salted password failed. Reason: %s", self.state.salted_password);
+ return "failure", "temporary-auth-failure";
+ end
+ elseif self.profile["scram_"..hashprep(hash_name)] then
+ local salted_password, iteration_count, salt, state = self.profile["scram_"..hashprep(hash_name)](self.state.name, self.realm);
+ if state == nil then return "failure", "not-authorized"
+ elseif state == false then return "failure", "account-disabled" end
+
+ self.state.salted_password = salted_password;
+ self.state.iteration_count = iteration_count;
+ self.state.salt = salt
+ end
+
+ local server_first_message = "r="..self.state.clientnonce..self.state.servernonce..",s="..base64.encode(self.state.salt)..",i="..self.state.iteration_count;
+ self.state["server_first_message"] = server_first_message;
+ return "challenge", server_first_message
+ else
+ -- we are processing client_final_message
+ local client_final_message = message;
+
+ self.state["channelbinding"], self.state["nonce"], self.state["proof"] = client_final_message:match("^c=(.*),r=(.*),.*p=(.*)");
+
+ if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
+ return "failure", "malformed-request", "Missing an attribute(p, r or c) in SASL message.";
+ end
+
+ if self.state.nonce ~= self.state.clientnonce..self.state.servernonce then
+ return "failure", "malformed-request", "Wrong nonce in client-final-message.";
+ end
+
+ local SaltedPassword = self.state.salted_password;
+ local ClientKey = HMAC_f(SaltedPassword, "Client Key")
+ local ServerKey = HMAC_f(SaltedPassword, "Server Key")
+ local StoredKey = H_f(ClientKey)
+ local AuthMessage = "n=" .. s_match(self.state.client_first_message,"n=(.+)") .. "," .. self.state.server_first_message .. "," .. s_match(client_final_message, "(.+),p=.+")
+ local ClientSignature = HMAC_f(StoredKey, AuthMessage)
+ local ClientProof = binaryXOR(ClientKey, ClientSignature)
+ local ServerSignature = HMAC_f(ServerKey, AuthMessage)
+
+ if base64.encode(ClientProof) == self.state.proof then
+ local server_final_message = "v="..base64.encode(ServerSignature);
+ self["username"] = self.state.name;
+ return "success", server_final_message;
+ else
+ return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
+ end
+ end
+ end
+ return scram_hash;
+end
+
+function init(registerMechanism)
+ local function registerSCRAMMechanism(hash_name, hash, hmac_hash)
+ registerMechanism("SCRAM-"..hash_name, {"plain", "scram_"..(hashprep(hash_name))}, scram_gen(hash_name:lower(), hash, hmac_hash));
+ end
+
+ registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
+end
+
+return _M;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 11:40:27 +0000