The ssh client appends empty `reserved` fields to the destination constraint extension [0]. This was found when working on our Rust-based library for writing SSH agents [1] which includes tests for messages captured using the OpenSSH client. This patch adjusts the documentation of the agent protocol to include the reserved fields. I have not found out the reasoning for this reserved value in commit 5e950d7657 and as such I didn't expand the documentation to include further context but I think it would be a good idea to add it. [0]: https://github.com/openssh/openssh-portable/blob/88351eca17dcc55189991ba60e50819b6d4193c1/authfd.c#L469 [1]: https://github.com/wiktor-k/ssh-agent-lib/blob/2605fba8497075d35daedc1f78522f3e2c17bf8d/src/proto/extension.rs#L71 Co-authored-by: Arthur Gautier <arthur.gautier@xxxxxxxxxx> Signed-off-by: Wiktor Kwapisiewicz <wiktor@xxxxxxxxxxxx> --- PROTOCOL.agent | 3 +++ 1 file changed, 3 insertions(+) diff --git a/PROTOCOL.agent b/PROTOCOL.agent index 7637882f1..3412cf5b8 100644 --- a/PROTOCOL.agent +++ b/PROTOCOL.agent @@ -49,10 +49,13 @@ Where a constraint consists of: string from_username (must be empty) string from_hostname + string reserved keyspec[] from_hostkeys string to_username string to_hostname + string reserved keyspec[] to_hostkeys + string reserved And a keyspec consists of: -- 2.44.0 _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
