drop support for old external-keyx and gssapi methods

[gssapi-openssh.git] / openssh / sshd_config.5

diff --git a/openssh/sshd_config.5 b/openssh/sshd_config.5
index dfd07b713ee22c6066c9506ee6dab2d94d9dbe73..5a214bfd0f8d257ed738a0bb663ede1f86021795 100644 (file)
--- a/openssh/sshd_config.5
+++ b/openssh/sshd_config.5
@@ -34,8 +34,8 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
 .\" (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 1.102 2009/02/22 23:59:25 djm Exp $
-.Dd $Mdocdate: February 22 2009 $
+.\" $OpenBSD: sshd_config.5,v 1.106 2009/04/21 15:13:17 stevesk Exp $
+.Dd $Mdocdate: April 21 2009 $

 .Dt SSHD_CONFIG 5
 .Os
 .Sh NAME
 .Dt SSHD_CONFIG 5
 .Os
 .Sh NAME


@@ -176,10 +176,9 @@ then no banner is displayed.
 This option is only available for protocol version 2.
 By default, no banner is displayed.
 .It Cm ChallengeResponseAuthentication
 This option is only available for protocol version 2.
 By default, no banner is displayed.
 .It Cm ChallengeResponseAuthentication

-Specifies whether challenge-response authentication is allowed.
-All authentication styles from
-.Xr login.conf 5
-are supported.
+Specifies whether challenge-response authentication is allowed (e.g. via
+PAM or though authentication styles supported in
+.Xr login.conf 5 )

 The default is
 .Dq yes .
 .It Cm ChrootDirectory
 The default is
 .Dq yes .
 .It Cm ChrootDirectory


@@ -188,6 +187,9 @@ Specifies a path to
 to after authentication.
 This path, and all its components, must be root-owned directories that are
 not writable by any other user or group.
 to after authentication.
 This path, and all its components, must be root-owned directories that are
 not writable by any other user or group.

+After the chroot,
+.Xr sshd 8
+changes the working directory to the user's home directory.

 .Pp
 The path may contain the following tokens that are expanded at runtime once
 the connecting user has been authenticated: %% is replaced by a literal '%',
 .Pp
 The path may contain the following tokens that are expanded at runtime once
 the connecting user has been authenticated: %% is replaced by a literal '%',


@@ -197,7 +199,7 @@ the connecting user has been authenticated: %% is replaced by a literal '%',
 The
 .Cm ChrootDirectory
 must contain the necessary files and directories to support the
 The
 .Cm ChrootDirectory
 must contain the necessary files and directories to support the

-users' session.
+user's session.

 For an interactive session this requires at least a shell, typically
 .Xr sh 1 ,
 and basic
 For an interactive session this requires at least a shell, typically
 .Xr sh 1 ,
 and basic


@@ -215,8 +217,11 @@ devices.
 For file transfer sessions using
 .Dq sftp ,
 no additional configuration of the environment is necessary if the
 For file transfer sessions using
 .Dq sftp ,
 no additional configuration of the environment is necessary if the

-in-process sftp server is used (see
-.Cm Subsystem
+in-process sftp server is used,
+though sessions which use logging do require
+.Pa /dev/log
+inside the chroot directory (see
+.Xr sftp-server 8

 for details).
 .Pp
 The default is not to
 for details).
 .Pp
 The default is not to


@@ -372,7 +377,17 @@ The default is
 .It Cm GSSAPIAuthentication
 Specifies whether user authentication based on GSSAPI is allowed.
 The default is
 .It Cm GSSAPIAuthentication
 Specifies whether user authentication based on GSSAPI is allowed.
 The default is

-.Dq no .
+.Dq yes .
+Note that this option applies to protocol version 2 only.
+.It Cm GSSAPIDelegateCredentials
+Specifies whether delegated credentials are stored in the user's environment.
+The default is
+.Dq yes .
+.It Cm GSSAPIKeyExchange
+Specifies whether key exchange based on GSSAPI is allowed. GSSAPI key exchange 
+doesn't rely on ssh keys to verify host identity.
+The default is
+.Dq yes .

 Note that this option applies to protocol version 2 only.
 .It Cm GSSAPICleanupCredentials
 Specifies whether to automatically destroy the user's credentials cache
 Note that this option applies to protocol version 2 only.
 .It Cm GSSAPICleanupCredentials
 Specifies whether to automatically destroy the user's credentials cache


@@ -380,6 +395,44 @@ on logout.
 The default is
 .Dq yes .
 Note that this option applies to protocol version 2 only.
 The default is
 .Dq yes .
 Note that this option applies to protocol version 2 only.

+.It Cm GSSAPICredentialsPath
+If specified, the delegated GSSAPI credential is stored in the
+given path, overwriting any existing credentials.  
+Paths can be specified with syntax similar to the AuthorizedKeysFile 
+option (i.e., accepting %h and %u tokens).  
+When using this option,
+setting 'GssapiCleanupCredentials no' is recommended,
+so logging out of one session
+doesn't remove the credentials in use by another session of
+the same user.
+Currently only implemented for the GSI mechanism.
+.It Cm GSIAllowLimitedProxy
+Specifies whether to accept limited proxy credentials for
+authentication.
+The default is
+.Dq no .
+.It Cm GSSAPIStrictAcceptorCheck
+Determines whether to be strict about the identity of the GSSAPI acceptor 
+a client authenticates against. If
+.Dq yes
+then the client must authenticate against the
+.Pa host
+service on the current hostname. If 
+.Dq no
+then the client may authenticate against any service key stored in the 
+machine's default store. This facility is provided to assist with operation 
+on multi homed machines. 
+The default is
+.Dq yes .
+Note that this option applies only to protocol version 2 GSSAPI connections,
+and setting it to 
+.Dq no
+may only work with recent Kerberos GSSAPI libraries.
+.It Cm GSSAPIStoreCredentialsOnRekey
+Controls whether the user's GSSAPI credentials should be updated following a 
+successful connection rekeying. This option can be used to accepted renewed 
+or updated credentials from a compatible client. The default is
+.Dq no .

 .It Cm HostbasedAuthentication
 Specifies whether rhosts or /etc/hosts.equiv authentication together
 with successful public key client host authentication is allowed
 .It Cm HostbasedAuthentication
 Specifies whether rhosts or /etc/hosts.equiv authentication together
 with successful public key client host authentication is allowed


@@ -923,6 +976,12 @@ is enabled, you will not be able to run
 as a non-root user.
 The default is
 .Dq no .
 as a non-root user.
 The default is
 .Dq no .

+.It Cm PermitPAMUserChange
+If set to
+.Dq yes
+this will enable PAM authentication to change the name of the user being
+authenticated.  The default is
+.Dq no .

 .It Cm UsePrivilegeSeparation
 Specifies whether
 .Xr sshd 8
 .It Cm UsePrivilegeSeparation
 Specifies whether
 .Xr sshd 8