local char = string.char;
local byte = string.byte;
-module "sasl.scram"
+local _ENV = nil;
--=========================
--SASL SCRAM-SHA-1 according to RFC 5802
return hashname:lower():gsub("-", "_");
end
-function getAuthenticationDatabaseSHA1(password, salt, iteration_count)
+local function getAuthenticationDatabaseSHA1(password, salt, iteration_count)
if type(password) ~= "string" or type(salt) ~= "string" or type(iteration_count) ~= "number" then
return false, "inappropriate argument types"
end
end
local function scram_gen(hash_name, H_f, HMAC_f)
+ local profile_name = "scram_" .. hashprep(hash_name);
local function scram_hash(self, message)
local support_channel_binding = false;
if self.profile.cb then support_channel_binding = true; end
local client_first_message = message;
-- TODO: fail if authzid is provided, since we don't support them yet
- local gs2_header, gs2_cbind_flag, gs2_cbind_name, authzid, client_first_message_bare, name, clientnonce
+ local gs2_header, gs2_cbind_flag, gs2_cbind_name, authzid, client_first_message_bare, username, clientnonce
= s_match(client_first_message, "^(([pny])=?([^,]*),([^,]*),)(m?=?[^,]*,?n=([^,]*),r=([^,]*),?.*)$");
if not gs2_cbind_flag then
gs2_cbind_name = nil;
end
- name = validate_username(name, self.profile.nodeprep);
- if not name then
+ username = validate_username(username, self.profile.nodeprep);
+ if not username then
log("debug", "Username violates either SASLprep or contains forbidden character sequences.")
return "failure", "malformed-request", "Invalid username.";
end
-- retreive credentials
local stored_key, server_key, salt, iteration_count;
if self.profile.plain then
- local password, state = self.profile.plain(self, name, self.realm)
- if state == nil then return "failure", "not-authorized"
- elseif state == false then return "failure", "account-disabled" end
+ local password, status = self.profile.plain(self, username, self.realm)
+ if status == nil then return "failure", "not-authorized"
+ elseif status == false then return "failure", "account-disabled" end
password = saslprep(password);
if not password then
log("error", "Generating authentication database failed. Reason: %s", stored_key);
return "failure", "temporary-auth-failure";
end
- elseif self.profile["scram_"..hashprep(hash_name)] then
- local state;
- stored_key, server_key, iteration_count, salt, state = self.profile["scram_"..hashprep(hash_name)](self, name, self.realm);
+ elseif self.profile[profile_name] then
+ local status;
+ stored_key, server_key, iteration_count, salt, status = self.profile[profile_name](self, username, self.realm);
if state == nil then return "failure", "not-authorized"
elseif state == false then return "failure", "account-disabled" end
end
self.state = {
gs2_header = gs2_header;
gs2_cbind_name = gs2_cbind_name;
- name = name;
+ username = username;
nonce = nonce;
server_key = server_key;
if StoredKey == H_f(ClientKey) then
local server_final_message = "v="..base64.encode(ServerSignature);
- self["username"] = state.name;
+ self["username"] = state.username;
return "success", server_final_message;
else
return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated.";
return scram_hash;
end
-function init(registerMechanism)
+local 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));
registerSCRAMMechanism("SHA-1", sha1, hmac_sha1);
end
-return _M;
+return {
+ getAuthenticationDatabaseSHA1 = getAuthenticationDatabaseSHA1;
+ init = init;
+}