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-rw-r--r--util/sasl.lua58
1 files changed, 53 insertions, 5 deletions
diff --git a/util/sasl.lua b/util/sasl.lua
index afb3861b..5845f34a 100644
--- a/util/sasl.lua
+++ b/util/sasl.lua
@@ -19,7 +19,7 @@ local setmetatable = setmetatable;
local assert = assert;
local require = require;
-module "sasl"
+local _ENV = nil;
--[[
Authentication Backend Prototypes:
@@ -27,19 +27,38 @@ Authentication Backend Prototypes:
state = false : disabled
state = true : enabled
state = nil : non-existant
+
+Channel Binding:
+
+To enable support of channel binding in some mechanisms you need to provide appropriate callbacks in a table
+at profile.cb.
+
+Example:
+ profile.cb["tls-unique"] = function(self)
+ return self.user
+ end
+
]]
local method = {};
method.__index = method;
local mechanisms = {};
local backend_mechanism = {};
+local mechanism_channelbindings = {};
-- register a new SASL mechanims
-function registerMechanism(name, backends, f)
+local function registerMechanism(name, backends, f, cb_backends)
assert(type(name) == "string", "Parameter name MUST be a string.");
assert(type(backends) == "string" or type(backends) == "table", "Parameter backends MUST be either a string or a table.");
assert(type(f) == "function", "Parameter f MUST be a function.");
+ if cb_backends then assert(type(cb_backends) == "table"); end
mechanisms[name] = f
+ if cb_backends then
+ mechanism_channelbindings[name] = {};
+ for _, cb_name in ipairs(cb_backends) do
+ mechanism_channelbindings[name][cb_name] = true;
+ end
+ end
for _, backend_name in ipairs(backends) do
if backend_mechanism[backend_name] == nil then backend_mechanism[backend_name] = {}; end
t_insert(backend_mechanism[backend_name], name);
@@ -47,7 +66,7 @@ function registerMechanism(name, backends, f)
end
-- create a new SASL object which can be used to authenticate clients
-function new(realm, profile)
+local function new(realm, profile)
local mechanisms = profile.mechanisms;
if not mechanisms then
mechanisms = {};
@@ -63,6 +82,15 @@ function new(realm, profile)
return setmetatable({ profile = profile, realm = realm, mechs = mechanisms }, method);
end
+-- add a channel binding handler
+function method:add_cb_handler(name, f)
+ if type(self.profile.cb) ~= "table" then
+ self.profile.cb = {};
+ end
+ self.profile.cb[name] = f;
+ return self;
+end
+
-- get a fresh clone with the same realm and profile
function method:clean_clone()
return new(self.realm, self.profile)
@@ -70,7 +98,23 @@ end
-- get a list of possible SASL mechanims to use
function method:mechanisms()
- return self.mechs;
+ local current_mechs = {};
+ for mech, _ in pairs(self.mechs) do
+ if mechanism_channelbindings[mech] then
+ if self.profile.cb then
+ local ok = false;
+ for cb_name, _ in pairs(self.profile.cb) do
+ if mechanism_channelbindings[mech][cb_name] then
+ ok = true;
+ end
+ end
+ if ok == true then current_mechs[mech] = true; end
+ end
+ else
+ current_mechs[mech] = true;
+ end
+ end
+ return current_mechs;
end
-- select a mechanism to use
@@ -92,5 +136,9 @@ require "util.sasl.plain" .init(registerMechanism);
require "util.sasl.digest-md5".init(registerMechanism);
require "util.sasl.anonymous" .init(registerMechanism);
require "util.sasl.scram" .init(registerMechanism);
+require "util.sasl.external" .init(registerMechanism);
-return _M;
+return {
+ registerMechanism = registerMechanism;
+ new = new;
+};