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-rw-r--r--util/sasl/scram.lua44
1 files changed, 41 insertions, 3 deletions
diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua
index b7507f3e..9362cca7 100644
--- a/util/sasl/scram.lua
+++ b/util/sasl/scram.lua
@@ -17,6 +17,7 @@ local base64 = require "util.encodings".base64;
local xor = require "bit".bxor
local hmac_sha1 = require "util.hmac".sha1;
local sha1 = require "util.hashes".sha1;
+local generate_uuid = require "util.uuid".generate;
module "plain"
@@ -71,15 +72,52 @@ local function scram_sha_1(self, message)
if not self.state.name then
-- we are processing client_first_message
- self.state["name"] = string.match(client_first_message, "n=(.+),r=")
- self.state["clientnonce"] = string.match(client_first_message, "r=([^,]+)")
+ local client_first_message = message;
+ self.state["name"] = client_first_message:match("n=(.+),r=")
+ self.state["clientnonce"] = client_first_message:match("r=([^,]+)")
self.state.name = validate_username(self.state.name);
- if not self.state.name then
+ if not self.state.name or not self.state.clientnonce then
return "failure", "malformed-request";
end
+ self.state["servernonce"] = generate_uuid();
+ self.state["salt"] = generate_uuid();
+
+ local server_first_message = "r="..self.state.clientnonce..self.state.servernonce..",s="..base64.encode(self.state.salt)..",i="..default_i;
+ return "challenge", server_first_message
else
-- we are processing client_final_message
+ local client_final_message = message;
+
+ self.state["proof"] = client_final_message:match("p=(.+)");
+ self.state["nonce"] = client_final_message:match("r=(.+),p=");
+ self.state["channelbinding"] = client_final_message:match("c=(.+),r=");
+ if not self.state.proof or not self.state.nonce or not self.state.channelbinding then
+ return "failure", "malformed-request";
+ end
+
+ local password;
+ if self.profile.plain then
+ 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
+ end
+
+ local SaltedPassword = Hi(hmac_sha1, password, self.state.salt, default_i)
+ local ClientKey = hmac_sha1(SaltedPassword, "Client Key")
+ local ServerKey = hmac_sha1(SaltedPassword, "Server Key")
+ local StoredKey = sha1(ClientKey)
+ local AuthMessage = "n=" .. s_match(client_first_message,"n=(.+)") .. "," .. server_first_message .. "," .. s_match(client_final_message, "(.+),p=.+")
+ local ClientSignature = hmac_sha1(StoredKey, AuthMessage)
+ local ClientProof = binaryXOR(ClientKey, ClientSignature)
+ local ServerSignature = hmac_sha1(ServerKey, AuthMessage)
+
+ if base64.encode(ClientProof) == self.state.proof then
+ local server_final_message = "v="..base64.encode(ServerSignature);
+ 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