diff options
| author | Darren Tucker <dtucker@cvs.openbsd.org> | 2006-07-17 12:06:01 +0000 |
|---|---|---|
| committer | Darren Tucker <dtucker@cvs.openbsd.org> | 2006-07-17 12:06:01 +0000 |
| commit | c9f2cd05915314961b7e5d9c274ec0e8608eac36 (patch) | |
| tree | 7620084451c561af7731e75b4bd67c43d20eec41 /usr.bin/ssh/sshd_config.5 | |
| parent | 48eb65f0a181ca249dc65a57813da6a8b9694839 (diff) | |
Add PermitOpen directive to sshd_config which is equivalent to the
"permitopen" key option. Allows server admin to allow TCP port forwarding
only two specific host/port pairs. Useful when combined with Match.
If permitopen is used in both sshd_config and a key option, both must allow
a given connection before it will be permitted.
Note that users can still use external forwarders such as netcat, so to be
those must be controlled too for the limits to be effective.
Feedback & ok djm@, man page corrections & ok jmc@.
Diffstat (limited to 'usr.bin/ssh/sshd_config.5')
| -rw-r--r-- | usr.bin/ssh/sshd_config.5 | 36 |
1 files changed, 33 insertions, 3 deletions
diff --git a/usr.bin/ssh/sshd_config.5 b/usr.bin/ssh/sshd_config.5 index b0ef53c41c8..2c2623cf5c5 100644 --- a/usr.bin/ssh/sshd_config.5 +++ b/usr.bin/ssh/sshd_config.5 @@ -34,7 +34,7 @@ .\" (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: sshd_config.5,v 1.61 2006/07/12 13:39:55 jmc Exp $ +.\" $OpenBSD: sshd_config.5,v 1.62 2006/07/17 12:06:00 dtucker Exp $ .Dd September 25, 1999 .Dt SSHD_CONFIG 5 .Os @@ -482,9 +482,10 @@ Only a subset of keywords may be used on the lines following a .Cm Match keyword. Available keywords are -.Cm AllowTcpForwarding +.Cm AllowTcpForwarding , +.Cm GatewayPorts , and -.Cm GatewayPorts . +.Cm PermitOpen . .It Cm MaxAuthTries Specifies the maximum number of authentication attempts permitted per connection. @@ -524,6 +525,35 @@ When password authentication is allowed, it specifies whether the server allows login to accounts with empty password strings. The default is .Dq no . +.It Cm PermitOpen +Specifies the destinations to which TCP port forwarding is permitted. +The forwarding specification must be one of the following forms: +.Pp +.Bl -item -offset indent -compact +.It +.Cm PermitOpen +.Sm off +.Ar host : port +.Sm on +.It +.Cm PermitOpen +.Sm off +.Ar IPv4_addr : port +.Sm on +.It +.Cm PermitOpen +.Sm off +.Ar \&[ IPv6_addr \&] : port +.Sm on +.El +.Pp +Multiple instances of +.Cm PermitOpen +are permitted. +An argument of +.Dq any +can be used to remove all restrictions and permit any forwarding requests. +By default all port forward requests are permitted. .It Cm PermitRootLogin Specifies whether root can log in using .Xr ssh 1 . |