package/network/services/hostapd/patches/066-0000-SAE-Reject-unsuitable-groups-based-on-REVmd-changes.patch

   1 From db54db11aec763b6fc74715c36e0f9de0d65e206 Mon Sep 17 00:00:00 2001
   2 From: Jouni Malinen <jouni@codeaurora.org>
   3 Date: Mon, 8 Apr 2019 18:01:07 +0300
   4 Subject: SAE: Reject unsuitable groups based on REVmd changes
   5
   6 The rules defining which DH groups are suitable for SAE use were
   7 accepted into IEEE 802.11 REVmd based on this document:
   8 https://mentor.ieee.org/802.11/dcn/19/11-19-0387-02-000m-addressing-some-sae-comments.docx
   9
  10 Enforce those rules in production builds of wpa_supplicant and hostapd.
  11 CONFIG_TESTING_OPTIONS=y builds can still be used to select any o the
  12 implemented groups to maintain testing coverage.
  13
  14 Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
  15 ---
  16  src/common/sae.c | 23 +++++++++++++++++++++++
  17  1 file changed, 23 insertions(+)
  18
  19 --- a/src/common/sae.c
  20 +++ b/src/common/sae.c
  21 @@ -18,10 +18,33 @@
  22  #include "sae.h"
  23
  24
  25 +static int sae_suitable_group(int group)
  26 +{
  27 +#ifdef CONFIG_TESTING_OPTIONS
  28 +       /* Allow all groups for testing purposes in non-production builds. */
  29 +       return 1;
  30 +#else /* CONFIG_TESTING_OPTIONS */
  31 +       /* Enforce REVmd rules on which SAE groups are suitable for production
  32 +        * purposes: FFC groups whose prime is >= 3072 bits and ECC groups
  33 +        * defined over a prime field whose prime is >= 256 bits. Furthermore,
  34 +        * ECC groups defined over a characteristic 2 finite field and ECC
  35 +        * groups with a co-factor greater than 1 are not suitable. */
  36 +       return group == 19 || group == 20 || group == 21 ||
  37 +               group == 28 || group == 29 || group == 30 ||
  38 +               group == 15 || group == 16 || group == 17 || group == 18;
  39 +#endif /* CONFIG_TESTING_OPTIONS */
  40 +}
  41 +
  42 +
  43  int sae_set_group(struct sae_data *sae, int group)
  44  {
  45         struct sae_temporary_data *tmp;
  46
  47 +       if (!sae_suitable_group(group)) {
  48 +               wpa_printf(MSG_DEBUG, "SAE: Reject unsuitable group %d", group);
  49 +               return -1;
  50 +       }
  51 +
  52         sae_clear_data(sae);
  53         tmp = sae->tmp = os_zalloc(sizeof(*tmp));
  54         if (tmp == NULL)