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Bluetooth: Enforce key size of 16 bytes on FIPS level

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According to the spec Ver 5.2, Vol 3, Part C, Sec 5.2.2.8:
Device in security mode 4 level 4 shall enforce:
128-bit equivalent strength for link and encryption keys required
using FIPS approved algorithms (E0 not allowed, SAFER+ not allowed,
and P-192 not allowed; encryption key not shortened)

This patch rejects connection with key size below 16 for FIPS
level services.

Signed-off-by: Archie Pusaka <apusaka@chromium.org>
Reviewed-by: Alain Michaud <alainm@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Archie Pusaka 2020-11-11 14:32:20 +08:00 committed by Marcel Holtmann
parent 0d484db60f
commit 288c06973d
1 changed files with 7 additions and 1 deletions
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8
net/bluetooth/l2cap_core.c
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@ -1515,8 +1515,14 @@ static bool l2cap_check_enc_key_size(struct hci_conn *hcon)
* that have no key size requirements. Ensure that the link is * that have no key size requirements. Ensure that the link is
* actually encrypted before enforcing a key size. * actually encrypted before enforcing a key size.
*/ */
int min_key_size = hcon->hdev->min_enc_key_size;
/* On FIPS security level, key size must be 16 bytes */
if (hcon->sec_level == BT_SECURITY_FIPS)
min_key_size = 16;
return (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags) || return (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags) ||
hcon->enc_key_size >= hcon->hdev->min_enc_key_size); hcon->enc_key_size >= min_key_size);
} }
static void l2cap_do_start(struct l2cap_chan *chan) static void l2cap_do_start(struct l2cap_chan *chan)