From fdb50b8256f1038d5bc4f906b41605cacc769bf4 Mon Sep 17 00:00:00 2001 From: Dimitri Staessens Date: Sun, 14 Jun 2026 16:16:03 +0200 Subject: irmd: Deliver flow re-keying MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Re-key each encrypted flow's batch root periodically so a long-lived flow never exhausts or over-uses a single root. The IRMd re-runs the OAP exchange with the peer IRMd over the flow-update relay. The per-flow re-keying state is tracked in the registry (reg_flow). A re-key delivers one root seed from the OAP exchange. keyrot immediately HKDF-expands it into 128 node keys (KR_NODES_SZ = 128 × 32 B) and wipes the root. Then each of the 128 node keys is itself a root → HKDF-expanded into 64 (2^KEY_NODE_BITS) leaf keys, forked per direction; each leaf key is the actual AEAD key, good for 2^20 packets (the low counter bits are its nonce/seq). If the number of keys runs low, a re-key will be triggered (KEY_REKEY_WATERMARK). The rekey is signalled out of band to the application. The rbuff ACL is generalized into a flags word, so an RB_REKEY bit rides alongside the access RB_RD/RB_WR and FLOWDOWN/FLOWPEER bits. The RD and WR bits are revised ditching the fcntl historical weirdness. The seed is pulled via flow_read/flow_write, installed with crypt_rekey(). TX holds the old epoch until the peer is observed on the new one (or a grace deadline elapses), promoted from both the read and write paths so a recv-mostly flow still advances. Also fix the FLOW_ACCEPT and FLOW_ALLOC handlers, which on a key-buffer allocation failure returned from inside the cleanup-push region: that leaked the reply message and skipped both the stack-key scrub and the cleanup pop. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders --- cmake/config/irmd.cmake | 2 ++ 1 file changed, 2 insertions(+) (limited to 'cmake/config') diff --git a/cmake/config/irmd.cmake b/cmake/config/irmd.cmake index b6b2dc40..79e24bae 100644 --- a/cmake/config/irmd.cmake +++ b/cmake/config/irmd.cmake @@ -22,6 +22,8 @@ set(OAP_REPLAY_TIMER 20 CACHE STRING "OAP replay protection window (s)") set(OAP_REPLAY_MAX 4096 CACHE STRING "Maximum entries in the OAP replay cache (bounds memory/CPU under flood)") +set(OAP_REKEY_TIMER 120 CACHE STRING + "Tier-2 re-key interval (s); bounds key age / PCS healing, 0 disables") set(OAP_CLIENT_AUTH_DEFAULT TRUE CACHE BOOL "Client requires the server to authenticate by default") set(DEBUG_PROTO_OAP FALSE CACHE BOOL -- cgit v1.2.3