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authorTobias Markmann <tm@ayena.de>2010-05-22 19:04:53 +0200
committerTobias Markmann <tm@ayena.de>2010-05-22 19:04:53 +0200
commit229d07afa05408750fbc8314bd4e51243b9daf4d (patch)
tree037512832c1b14be9f834303808da69e9a4b1f16 /util/sasl/scram.lua
parent47c7c633170ae0d947a7f22e720f1868fec63332 (diff)
downloadprosody-229d07afa05408750fbc8314bd4e51243b9daf4d.tar.gz
prosody-229d07afa05408750fbc8314bd4e51243b9daf4d.zip
util.sasl.scram: Providing an API function to generate a salted password for the SCRAM-SHA-1 mechanism.
Diffstat (limited to 'util/sasl/scram.lua')
-rw-r--r--util/sasl/scram.lua21
1 files changed, 20 insertions, 1 deletions
diff --git a/util/sasl/scram.lua b/util/sasl/scram.lua
index 13b9932f..39daf397 100644
--- a/util/sasl/scram.lua
+++ b/util/sasl/scram.lua
@@ -92,6 +92,18 @@ local function validate_username(username)
return username;
end
+function saltedPasswordSHA1(password, salt, iteration_count)
+ local salted_password
+ if type(password) ~= "string" and type(salt) ~= "string" and type(iteration_count) ~= "number" then
+ return false, "inappropriate argument types"
+ end
+ if iteration_count < 4096 then
+ log("warning", "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
@@ -133,9 +145,16 @@ local function scram_gen(hash_name, H_f, HMAC_f)
log("debug", "Password violates SASLprep.");
return "failure", "not-authorized", "Invalid password."
end
+
self.state.salt = generate_uuid();
self.state.iteration_count = default_i;
- self.state.salted_password = Hi(HMAC_f, password, self.state.salt, 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_"..hash_name] then
local salted_password, iteration_count, salt, state = self.profile["scram-"..hash_name](self.state.name, self.realm);
if state == nil then return "failure", "not-authorized"