add a SessionType directive to ssh_config, allowing the configuration

file to offer equivalent control to the -N (no session) and -s
(subsystem) command-line flags.

Part of GHPR#231 by Volker Diels-Grabsch with some minor tweaks;
feedback and ok dtucker@

1 files changed, 17 insertions, 2 deletions

diff --git a/usr.bin/ssh/ssh_config.5 b/usr.bin/ssh/ssh_config.5
index a34d2a0d1d9..179a65f3e94 100644
--- a/usr.bin/ssh/ssh_config.5
+++ b/usr.bin/ssh/ssh_config.5
@@ -33,8 +33,8 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $OpenBSD: ssh_config.5,v 1.355 2021/07/02 05:11:21 dtucker Exp $
-.Dd $Mdocdate: July 2 2021 $
+.\" $OpenBSD: ssh_config.5,v 1.356 2021/07/13 23:48:36 djm Exp $
+.Dd $Mdocdate: July 13 2021 $
 .Dt SSH_CONFIG 5
 .Os
 .Sh NAME
@@ -1264,6 +1264,21 @@ The argument to this keyword must be
 or
 .Cm no
 (the default).
+.It Cm SessionType
+May be used to either request invocation of a subsystem on the remote system,
+or to prevent the execution of a remote command at all.
+The latter is useful for just forwarding ports.
+The argument to this keyword must be
+.Cm none
+(same as the
+.Fl N
+option),
+.Cm subsystem
+(same as the
+.Fl s
+option) or
+.Cm default
+(shell or command execution).
 .It Cm NumberOfPasswordPrompts
 Specifies the number of password prompts before giving up.
 The argument to this keyword must be an integer.