package/network/services/hostapd/patches/066-0000-EAP-pwd-Disallow-ECC-groups-with-a-prime-under-256-b.patch

   1 From 92e1b96c26a84e503847bdd22ebadf697c4031ad Mon Sep 17 00:00:00 2001
   2 From: Jouni Malinen <j@w1.fi>
   3 Date: Sat, 13 Apr 2019 17:20:57 +0300
   4 Subject: EAP-pwd: Disallow ECC groups with a prime under 256 bits
   5
   6 Based on the SAE implementation guidance update to not allow ECC groups
   7 with a prime that is under 256 bits, reject groups 25, 26, and 27 in
   8 EAP-pwd.
   9
  10 Signed-off-by: Jouni Malinen <j@w1.fi>
  11 ---
  12  src/eap_common/eap_pwd_common.c | 13 +++++++++++++
  13  1 file changed, 13 insertions(+)
  14
  15 --- a/src/eap_common/eap_pwd_common.c
  16 +++ b/src/eap_common/eap_pwd_common.c
  17 @@ -85,10 +85,23 @@ static int eap_pwd_kdf(const u8 *key, si
  18  }
  19
  20
  21 +static int eap_pwd_suitable_group(u16 num)
  22 +{
  23 +       /* Do not allow ECC groups with prime under 256 bits based on guidance
  24 +        * for the similar design in SAE. */
  25 +       return num == 19 || num == 20 || num == 21 ||
  26 +               num == 28 || num == 29 || num == 30;
  27 +}
  28 +
  29 +
  30  EAP_PWD_group * get_eap_pwd_group(u16 num)
  31  {
  32         EAP_PWD_group *grp;
  33
  34 +       if (!eap_pwd_suitable_group(num)) {
  35 +               wpa_printf(MSG_INFO, "EAP-pwd: unsuitable group %u", num);
  36 +               return NULL;
  37 +       }
  38         grp = os_zalloc(sizeof(EAP_PWD_group));
  39         if (!grp)
  40                 return NULL;