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-rw-r--r--util/sasl/external.lua25
-rw-r--r--util/sasl/scram.lua28
2 files changed, 39 insertions, 14 deletions
diff --git a/util/sasl/external.lua b/util/sasl/external.lua
new file mode 100644
index 00000000..4c5c4343
--- /dev/null
+++ b/util/sasl/external.lua
@@ -0,0 +1,25 @@
+local saslprep = require "util.encodings".stringprep.saslprep;
+
+module "sasl.external"
+
+local function external(self, message)
+ message = saslprep(message);
+ local state
+ self.username, state = self.profile.external(message);
+
+ if state == false then
+ return "failure", "account-disabled";
+ elseif state == nil then
+ return "failure", "not-authorized";
+ elseif state == "expired" then
+ return "false", "credentials-expired";
+ end
+
+ return "success";
+end
+
+function init(registerMechanism)
+ registerMechanism("EXTERNAL", {"external"}, external);
+end
+
+return _M;
diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua
index cf2f0ede..31c078a0 100644
--- a/util/sasl/scram.lua
+++ b/util/sasl/scram.lua
@@ -73,11 +73,11 @@ local function validate_username(username, _nodeprep)
return false
end
end
-
+
-- replace =2C with , and =3D with =
username = username:gsub("=2C", ",");
username = username:gsub("=3D", "=");
-
+
-- apply SASLprep
username = saslprep(username);
@@ -108,12 +108,12 @@ 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"]
@@ -127,21 +127,21 @@ local function scram_gen(hash_name, H_f, HMAC_f)
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, self.profile.nodeprep);
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, 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.");
@@ -161,22 +161,22 @@ local function scram_gen(hash_name, H_f, HMAC_f)
local stored_key, server_key, iteration_count, salt, state = self.profile["scram_"..hashprep(hash_name)](self, self.state.name, self.realm);
if state == nil then return "failure", "not-authorized"
elseif state == false then return "failure", "account-disabled" end
-
+
self.state.stored_key = stored_key;
self.state.server_key = server_key;
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
@@ -184,10 +184,10 @@ local function scram_gen(hash_name, H_f, HMAC_f)
if self.state.nonce ~= self.state.clientnonce..self.state.servernonce then
return "failure", "malformed-request", "Wrong nonce in client-final-message.";
end
-
+
local ServerKey = self.state.server_key;
local StoredKey = self.state.stored_key;
-
+
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 ClientKey = binaryXOR(ClientSignature, base64.decode(self.state.proof))