system: remove DES password encoding

DES is long dead, it is insecure as hell, and virtually all known
crypt(3) implementations now all support at least md5.

Besides, the character-space of DES-encoded passwords are a sub-set
of the character-space for a clear-text password, so we can't easily
differentiate between the two. Since we're going to change the root
password prompt to support setting encoded passwords (as well as
clear-text passwords), we can't keep DES or we'd be unable to decide
whether we'd need to encode the password or not.

Remove DES encoding altogether (and add a legacy entry). The default is
still md5, and thus there's no backward-compatibility 'select' to add.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Lorenzo Catucci <lorenzo@sancho.ccd.uniroma2.it>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

diff --git a/Config.in.legacy b/Config.in.legacy
index 445cab749cfa102c97d2bb06598ea594333626f3..0fc794f75803e0a7e413c0329dc691920f6e41b9 100644 (file)
--- a/Config.in.legacy
+++ b/Config.in.legacy
@@ -101,6 +101,13 @@ endif
 ###############################################################################
 comment "Legacy options removed in 2015.05"
 
+config BR2_TARGET_GENERIC_PASSWD_DES
+       bool "Encoding passwords with DES has been removed"
+       select BR2_LEGACY
+       help
+         Paswords can now only be encoded with either of md5, sha256 or sha512.
+         The default is md5, which is stronger that DES (but still pretty weak).
+
 config BR2_PACKAGE_GTK2_THEME_HICOLOR
        bool "hicolor (default theme) is a duplicate"
        select BR2_LEGACY

diff --git a/system/Config.in b/system/Config.in
index 935f7a11fad114105ceabdfc13fa45299f984a5b..431524d10363059960c63ec7c96d6a45d2a13f5c 100644 (file)
--- a/system/Config.in
+++ b/system/Config.in
@@ -27,14 +27,6 @@ choice
 
          Note: this is used at build-time, and *not* at runtime.
 
-config BR2_TARGET_GENERIC_PASSWD_DES
-       bool "des"
-       help
-         Use standard 56-bit DES-based crypt(3) to encode passwords.
-
-         Old, wildly available, but also the weakest, very susceptible to
-         brute-force attacks.
-
 config BR2_TARGET_GENERIC_PASSWD_MD5
        bool "md5"
        help
@@ -67,7 +59,6 @@ endchoice # Passwd encoding
 
 config BR2_TARGET_GENERIC_PASSWD_METHOD
        string
-       default "des"       if BR2_TARGET_GENERIC_PASSWD_DES
        default "md5"       if BR2_TARGET_GENERIC_PASSWD_MD5
        default "sha-256"   if BR2_TARGET_GENERIC_PASSWD_SHA256
        default "sha-512"   if BR2_TARGET_GENERIC_PASSWD_SHA512