[PATCH net-next] handshake: Require admin permission for DONE command

[Chuck Lever <cel@kernel.org>]

From: Chuck Lever <chuck.lever@oracle.com>

ACCEPT and DONE are the two downcalls of the handshake genl
family, both intended for use by the trusted handshake agent
(tlshd). ACCEPT already requires GENL_ADMIN_PERM; DONE has
no privilege check at all.

The fd-lookup in handshake_nl_done_doit() only confirms that
some pending handshake request exists for the supplied sockfd;
it does not authenticate the sender. An unprivileged process
that guesses or observes a valid sockfd can therefore submit
a DONE with HANDSHAKE_A_DONE_STATUS == 0, leaving the kernel
consumer to proceed as if the handshake succeeded. A non-zero
status on a forged DONE tears down a legitimate in-flight
handshake before tlshd can report its real result.

Fixes: 3b3009ea8abb ("net/handshake: Create a NETLINK service for handling handshake requests")
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 Documentation/netlink/specs/handshake.yaml | 1 +
 net/handshake/genl.c                       | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/netlink/specs/handshake.yaml b/Documentation/netlink/specs/handshake.yaml
index 95c3fade7a8d..24f5a0ac5920 100644
--- a/Documentation/netlink/specs/handshake.yaml
+++ b/Documentation/netlink/specs/handshake.yaml
@@ -117,6 +117,7 @@ operations:
       name: done
       doc: Handler reports handshake completion
       attribute-set: done
+      flags: [admin-perm]
       do:
         request:
           attributes:
diff --git a/net/handshake/genl.c b/net/handshake/genl.c
index 870612609491..791c45671cd6 100644
--- a/net/handshake/genl.c
+++ b/net/handshake/genl.c
@@ -37,7 +37,7 @@ static const struct genl_split_ops handshake_nl_ops[] = {
 		.doit		= handshake_nl_done_doit,
 		.policy		= handshake_done_nl_policy,
 		.maxattr	= HANDSHAKE_A_DONE_REMOTE_AUTH,
-		.flags		= GENL_CMD_CAP_DO,
+		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
 	},
 };
 
-- 
2.54.0