X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/7c36e880d977ad8311b7711393fc0fa620aaa451..040d6b1f7000ee8e36f8d0a21ea82a5f88acb7a5:/ssh.1

diff --git a/ssh.1 b/ssh.1
index 857c58e0..568b5314 100644
--- a/ssh.1
+++ b/ssh.1
@@ -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: ssh.1,v 1.272 2008/02/09 12:15:43 mcbride Exp $
+.\" $OpenBSD: ssh.1,v 1.280 2008/11/09 12:34:47 tobias Exp $
 .Dd $Mdocdate$
 .Dt SSH 1
 .Os
@@ -43,7 +43,7 @@
 .Nd OpenSSH SSH client (remote login program)
 .Sh SYNOPSIS
 .Nm ssh
-.Op Fl 1246AaCfgKkMNnqsTtVvXxY
+.Op Fl 1246AaCfgKkMNnqsTtVvXxYy
 .Op Fl b Ar bind_address
 .Op Fl c Ar cipher_spec
 .Oo Fl D\ \&
@@ -290,6 +290,15 @@ This implies
 The recommended way to start X11 programs at a remote site is with
 something like
 .Ic ssh -f host xterm .
+.Pp
+If the
+.Cm ExitOnForwardFailure
+configuration option is set to
+.Dq yes ,
+then a client started with
+.Fl f
+will wait for all remote port forwards to be successfully established
+before placing itself in the background.
 .It Fl g
 Allows remote hosts to connect to local forwarded ports.
 .It Fl I Ar smartcard_device
@@ -498,6 +507,7 @@ For full details of the options listed below, and their possible values, see
 .It User
 .It UserKnownHostsFile
 .It VerifyHostKeyDNS
+.It VisualHostKey
 .It XAuthLocation
 .El
 .It Fl p Ar port
@@ -540,7 +550,7 @@ using an alternative syntax:
 .Pp
 By default, the listening socket on the server will be bound to the loopback
 interface only.
-This may be overriden by specifying a
+This may be overridden by specifying a
 .Ar bind_address .
 An empty
 .Ar bind_address ,
@@ -648,6 +658,11 @@ Disables X11 forwarding.
 Enables trusted X11 forwarding.
 Trusted X11 forwardings are not subjected to the X11 SECURITY extension
 controls.
+.It Fl y
+Send log information using the
+.Xr syslog 3
+system module.
+By default this information is sent to stderr.
 .El
 .Pp
 .Nm
@@ -883,9 +898,10 @@ Send a BREAK to the remote system
 .It Cm ~C
 Open command line.
 Currently this allows the addition of port forwardings using the
-.Fl L
-and
+.Fl L ,
 .Fl R
+and
+.Fl D
 options (see above).
 It also allows the cancellation of existing remote port-forwardings
 using
@@ -1027,9 +1043,31 @@ Fingerprints can be determined using
 .Pp
 .Dl $ ssh-keygen -l -f /etc/ssh/ssh_host_rsa_key
 .Pp
-If the fingerprint is already known,
-it can be matched and verified,
-and the key can be accepted.
+If the fingerprint is already known, it can be matched
+and the key can be accepted or rejected.
+Because of the difficulty of comparing host keys
+just by looking at hex strings,
+there is also support to compare host keys visually,
+using
+.Em random art .
+By setting the
+.Cm VisualHostKey
+option to
+.Dq yes ,
+a small ASCII graphic gets displayed on every login to a server, no matter
+if the session itself is interactive or not.
+By learning the pattern a known server produces, a user can easily
+find out that the host key has changed when a completely different pattern
+is displayed.
+Because these patterns are not unambiguous however, a pattern that looks
+similar to the pattern remembered only gives a good probability that the
+host key is the same, not guaranteed proof.
+.Pp
+To get a listing of the fingerprints along with their random art for
+all known hosts, the following command line can be used:
+.Pp
+.Dl $ ssh-keygen -lv -f ~/.ssh/known_hosts
+.Pp
 If the fingerprint is unknown,
 an alternative method of verification is available:
 SSH fingerprints verified by DNS.
@@ -1433,6 +1471,13 @@ manual page for more information.
 .%T "The Secure Shell (SSH) Public Key File Format"
 .%D 2006
 .Re
+.Rs
+.%T "Hash Visualization: a New Technique to improve Real-World Security"
+.%A A. Perrig
+.%A D. Song
+.%D 1999
+.%O "International Workshop on Cryptographic Techniques and E-Commerce (CrypTEC '99)"
+.Re
 .Sh AUTHORS
 OpenSSH is a derivative of the original and free
 ssh 1.2.12 release by Tatu Ylonen.