test: Look for possible sshd-session paths (if it's there at all) in mbuto's profile

Some distributions already have OpenSSH 9.8, which introduces split
sshd/sshd-session binaries, and there we need to copy the binary from
the host, which can be /usr/libexec/openssh/sshd-session (Fedora
Rawhide), /usr/lib/ssh/sshd-session (Arch Linux),
/usr/lib/openssh/sshd-session (Debian), and possibly other paths.

Add at least those three, and, if we don't find sshd-session, assume
we don't need it: it could very well be an older version of OpenSSH,
as reported by David for Fedora 40, or perhaps another daemon (would
Dropbear even work? I'm not sure).

Reported-by: David Gibson <david@gibson.dropbear.id.au>
Fixes: d6817b3930be ("test/passt.mbuto: Install sshd-session OpenSSH's split process")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Tested-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 9 insertions, 2 deletions

diff --git a/test/passt.mbuto b/test/passt.mbuto
index 61865e8..138d365 100755
--- a/test/passt.mbuto
+++ b/test/passt.mbuto
@@ -13,8 +13,15 @@
 PROGS="${PROGS:-ash,dash,bash ip mount ls insmod mkdir ln cat chmod lsmod
        modprobe find grep mknod mv rm umount jq iperf3 dhclient hostname
        sed tr chown sipcalc cut socat dd strace ping tail killall sleep sysctl
-       nproc tcp_rr tcp_crr udp_rr which tee seq bc sshd ssh-keygen cmp
-       /usr/lib/openssh/sshd-session}"
+       nproc tcp_rr tcp_crr udp_rr which tee seq bc sshd ssh-keygen cmp}"
+
+# OpenSSH 9.8 introduced split binaries, with sshd being the daemon, and
+# sshd-session the per-session program. We need the latter as well, and the path
+# depends on the distribution. It doesn't exist on older versions.
+for bin in /usr/lib/openssh/sshd-session /usr/lib/ssh/sshd-session \
+	   /usr/libexec/openssh/sshd-session; do
+	command -v "${bin}" >/dev/null && PROGS="${PROGS} ${bin}"
+done
 
 KMODS="${KMODS:- virtio_net virtio_pci vmw_vsock_virtio_transport}"