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| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2014-01-16 19:47:35 +0100 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2014-01-16 19:47:35 +0100 |
| commit | df00ab1096868b3cffe563c48de5572f78b50392 (patch) | |
| tree | e58f6e5dbc25e06f96b3b59bc8349b7cf75e7677 | |
| parent | b826537cb4aa2358027ffcb1dd6a87274734e962 (diff) | |
| download | cgit-df00ab1096868b3cffe563c48de5572f78b50392.tar.gz cgit-df00ab1096868b3cffe563c48de5572f78b50392.tar.xz | |
auth: lua string comparisons are time invariant
By default, strings are compared by hash, so we can remove this comment.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
| -rw-r--r-- | filters/simple-authentication.lua | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/filters/simple-authentication.lua b/filters/simple-authentication.lua index 5935d08..5c4f074 100644 --- a/filters/simple-authentication.lua +++ b/filters/simple-authentication.lua @@ -45,7 +45,7 @@ function authenticate_post() redirect_to(redirect) - -- TODO: Implement time invariant string comparison function to mitigate timing attack. + -- Lua hashes strings, so these comparisons are time invariant. if password == nil or password ~= post["password"] then set_cookie("cgitauth", "") else @@ -222,7 +222,7 @@ function validate_value(cookie) return nil end - -- TODO: implement time invariant comparison to prevent against timing attack. + -- Lua hashes strings, so these comparisons are time invariant. if hmac ~= crypto.hmac.digest("sha1", value .. "|" .. tostring(expiration) .. "|" .. salt, secret) then return nil end |