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| author | Evgeniy Khramtsov <ekhramtsov@process-one.net> | 2010-10-24 17:17:30 +1000 |
|---|---|---|
| committer | Evgeniy Khramtsov <ekhramtsov@process-one.net> | 2010-10-24 17:17:30 +1000 |
| commit | 641dc7d6954dd777170ae1c68470cb2729a256af (patch) | |
| tree | 186b044d82299981e4f71f4026c3fd69c0e12e65 /src/ejabberd_auth.erl | |
| parent | * Rename option captcha to captcha_protected for consistency. (diff) | |
Add password entropy check (EJAB-1326)
Diffstat (limited to 'src/ejabberd_auth.erl')
| -rw-r--r-- | src/ejabberd_auth.erl | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/src/ejabberd_auth.erl b/src/ejabberd_auth.erl index 30ef9768..613ec1e3 100644 --- a/src/ejabberd_auth.erl +++ b/src/ejabberd_auth.erl @@ -49,7 +49,8 @@ is_user_exists_in_other_modules/3, remove_user/2, remove_user/3, - plain_password_required/1 + plain_password_required/1, + entropy/1 ]). -export([auth_modules/1]). @@ -318,6 +319,29 @@ remove_user(User, Server, Password) -> end, R. +%% @spec (IOList) -> non_negative_float() +%% @doc Calculate informational entropy. +entropy(IOList) -> + case binary_to_list(iolist_to_binary(IOList)) of + "" -> + 0.0; + S -> + Set = lists:foldl( + fun(C, [Digit, Printable, LowLetter, HiLetter, Other]) -> + if C >= $a, C =< $z -> + [Digit, Printable, 26, HiLetter, Other]; + C >= $0, C =< $9 -> + [9, Printable, LowLetter, HiLetter, Other]; + C >= $A, C =< $Z -> + [Digit, Printable, LowLetter, 26, Other]; + C >= 16#21, C =< 16#7e -> + [Digit, 33, LowLetter, HiLetter, Other]; + true -> + [Digit, Printable, LowLetter, HiLetter, 128] + end + end, [0, 0, 0, 0, 0], S), + length(S) * math:log(lists:sum(Set))/math:log(2) + end. %%%---------------------------------------------------------------------- %%% Internal functions |