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* [PATCH 1/2] peer: add wg_peer_reset_keys
@ 2019-01-25  1:53 Derrick Pallas
  2019-01-25  1:53 ` [PATCH 2/2] netdev: reset peer keys when changing private key Derrick Pallas
  0 siblings, 1 reply; 2+ messages in thread
From: Derrick Pallas @ 2019-01-25  1:53 UTC (permalink / raw)
  To: wireguard

This function will clear the key state for the peer and reset its handshake
timer.  This is useful, for instance, if it is known that the current key
material is bad.  Currently, this happens when the private key is changed.

Signed-off-by: Derrick Pallas <derrick@pallas.us>
---
 src/peer.c | 14 ++++++++++++++
 src/peer.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/src/peer.c b/src/peer.c
index 020a97b..49af31f 100644
--- a/src/peer.c
+++ b/src/peer.c
@@ -87,6 +87,20 @@ struct wg_peer *wg_peer_get_maybe_zero(struct wg_peer *peer)
 	return peer;
 }
 
+void wg_peer_reset_keys(struct wg_peer *peer)
+{
+	if (unlikely(!peer))
+		return;
+	lockdep_assert_held(&peer->device->device_update_lock);
+
+	wg_noise_handshake_clear(&peer->handshake);
+	wg_noise_keypairs_clear(&peer->keypairs);
+	wg_cookie_checker_precompute_peer_keys(peer);
+	atomic64_set(&peer->last_sent_handshake,
+		ktime_get_boot_fast_ns() -
+			(u64)(REKEY_TIMEOUT + 1) * NSEC_PER_SEC);
+}
+
 /* We have a separate "remove" function make sure that all active places where
  * a peer is currently operating will eventually come to an end and not pass
  * their reference onto another context.
diff --git a/src/peer.h b/src/peer.h
index 2e04262..3800e6f 100644
--- a/src/peer.h
+++ b/src/peer.h
@@ -78,5 +78,6 @@ static inline struct wg_peer *wg_peer_get(struct wg_peer *peer)
 void wg_peer_put(struct wg_peer *peer);
 void wg_peer_remove(struct wg_peer *peer);
 void wg_peer_remove_all(struct wg_device *wg);
+void wg_peer_reset_keys(struct wg_peer *peer);
 
 #endif /* _WG_PEER_H */
-- 
2.19.2

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^ permalink raw reply	[flat|nested] 2+ messages in thread

* [PATCH 2/2] netdev: reset peer keys when changing private key
  2019-01-25  1:53 [PATCH 1/2] peer: add wg_peer_reset_keys Derrick Pallas
@ 2019-01-25  1:53 ` Derrick Pallas
  0 siblings, 0 replies; 2+ messages in thread
From: Derrick Pallas @ 2019-01-25  1:53 UTC (permalink / raw)
  To: wireguard

Without this change, it can take until the handshake timeout period to
reestablish with the peer.  After this change, the handshake occurs as soon
as possible and the link is reestablished much more quickly.

Signed-off-by: Derrick Pallas <derrick@pallas.us>
---
 src/netlink.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/netlink.c b/src/netlink.c
index 3458c81..f6b10ad 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -539,6 +539,8 @@ static int wg_set_device(struct sk_buff *skb, struct genl_info *info)
 					 peer_list) {
 			if (!wg_noise_precompute_static_static(peer))
 				wg_peer_remove(peer);
+			else
+				wg_peer_reset_keys(peer);
 		}
 		wg_cookie_checker_precompute_device_keys(&wg->cookie_checker);
 		up_write(&wg->static_identity.lock);
-- 
2.19.2

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WireGuard@lists.zx2c4.com
https://lists.zx2c4.com/mailman/listinfo/wireguard

^ permalink raw reply	[flat|nested] 2+ messages in thread

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