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Diff for /src/usr.bin/ssh/ssh.1 between version 1.106 and 1.107

version 1.106, 2001/04/22 13:32:27 version 1.107, 2001/04/22 23:58:36
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 This form of authentication alone is normally not  This form of authentication alone is normally not
 allowed by the server because it is not secure.  allowed by the server because it is not secure.
 .Pp  .Pp
 The second (and primary) authentication method is the  The second authentication method is the
 .Pa rhosts  .Pa rhosts
 or  or
 .Pa hosts.equiv  .Pa hosts.equiv
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 .Ss SSH protocol version 2  .Ss SSH protocol version 2
 .Pp  .Pp
 When a user connects using the protocol version 2  When a user connects using the protocol version 2
 different authentication methods are available:  different authentication methods are available.
 At first, the client attempts to authenticate using the public key method.  Using the default values for
 If this method fails password authentication is tried.  .Cm PreferredAuthentications ,
   the client will try to authenticate first using the public key method;
   if this method fails password authentication is attempted,
   and finally if this method fails keyboard-interactive authentication
   is attempted.
   If this method fails password authentication is
   tried.
 .Pp  .Pp
 The public key method is similar to RSA authentication described  The public key method is similar to RSA authentication described
 in the previous section except that the DSA or RSA algorithm is used  in the previous section and allows the RSA or DSA algorithm to be used:
 instead.  
 The client uses his private key,  The client uses his private key,
 .Pa $HOME/.ssh/id_dsa  .Pa $HOME/.ssh/id_dsa
 or  or
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 .Pp  .Pp
 If public key authentication fails or is not available a password  If public key authentication fails or is not available a password
 can be sent encrypted to the remote host for proving the user's identity.  can be sent encrypted to the remote host for proving the user's identity.
 This protocol 2 implementation does not yet support Kerberos or  
 S/Key authentication.  
 .Pp  .Pp
   Additionally,
   .Nm
   supports hostbased or challenge response authentication.
   .Pp
 Protocol 2 provides additional mechanisms for confidentiality  Protocol 2 provides additional mechanisms for confidentiality
 (the traffic is encrypted using 3DES, Blowfish, CAST128 or Arcfour)  (the traffic is encrypted using 3DES, Blowfish, CAST128 or Arcfour)
 and integrity (hmac-md5, hmac-sha1).  and integrity (hmac-md5, hmac-sha1).
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 List forwarded connections  List forwarded connections
 .It Cm ~&  .It Cm ~&
 Background ssh at logout when waiting for forwarded connection / X11 sessions  Background ssh at logout when waiting for forwarded connection / X11 sessions
 to terminate (this does not currently work for SSH protocol version 2)  to terminate (protocol version 1 only)
 .It Cm ~?  .It Cm ~?
 Display a list of escape characters  Display a list of escape characters
 .It Cm ~R  .It Cm ~R
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 Port forwardings can also be specified in the configuration file.  Port forwardings can also be specified in the configuration file.
 Privileged ports can be forwarded only when  Privileged ports can be forwarded only when
 logging in as root on the remote machine.  logging in as root on the remote machine.
   IPv6 addresses can be specified with an alternative syntax:
   .Ar port/host/hostport
 .It Fl 1  .It Fl 1
 Forces  Forces
 .Nm  .Nm
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 .Dq yes  .Dq yes
 or  or
 .Dq no .  .Dq no .
   This option applies to protocol version 1 only.
 .It Cm BatchMode  .It Cm BatchMode
 If set to  If set to
 .Dq yes ,  .Dq yes ,
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 .Pp  .Pp
 .Bd -literal  .Bd -literal
   ``aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,    ``aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,
     aes192-cbc,aes256-cbc,rijndael128-cbc,rijndael192-cbc,      aes192-cbc,aes256-cbc''
     rijndael256-cbc,rijndael-cbc@lysator.liu.se''  
 .Ed  .Ed
 .It Cm Compression  .It Cm Compression
 Specifies whether to use compression.  Specifies whether to use compression.
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 The default level is 6, which is good for most applications.  The default level is 6, which is good for most applications.
 The meaning of the values is the same as in  The meaning of the values is the same as in
 .Xr gzip 1 .  .Xr gzip 1 .
   Note that this option applies to protocol version 1 only.
 .It Cm ConnectionAttempts  .It Cm ConnectionAttempts
 Specifies the number of tries (one per second) to make before falling  Specifies the number of tries (one per second) to make before falling
 back to rsh or exiting.  back to rsh or exiting.
 The argument must be an integer.  The argument must be an integer.
 This may be useful in scripts if the connection sometimes fails.  This may be useful in scripts if the connection sometimes fails.
 The default is 4.  The default is 4.
 .It Cm PubkeyAuthentication  
 Specifies whether to try public key authentication.  
 The argument to this keyword must be  
 .Dq yes  
 or  
 .Dq no .  
 The default is  
 .Dq yes .  
 Note that this option applies to protocol version 2 only.  
 .It Cm EscapeChar  .It Cm EscapeChar
 Sets the escape character (default:  Sets the escape character (default:
 .Ql ~ ) .  .Ql ~ ) .
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 Specifies a file to use for the protocol version 2 global  Specifies a file to use for the protocol version 2 global
 host key database instead of  host key database instead of
 .Pa /etc/ssh_known_hosts2 .  .Pa /etc/ssh_known_hosts2 .
 .It Cm HostKeyAlias  .It Cm HostbasedAuthentication
 Specifies an alias that should be used instead of the  Specifies whether to try rhosts based authentication with public key
 real host name when looking up or saving the host key  authentication.
 in the known_hosts files.  The argument must be
 This option is useful for tunneling ssh connections  .Dq yes
 or if you have multiple servers running on a single host.  or
   .Dq no .
   The default is
   .Dq yes .
   This option applies to protocol version 2 only and
   is similar to
   .Cm RhostsRSAAuthentication .
 .It Cm HostKeyAlgorithms  .It Cm HostKeyAlgorithms
 Specfies the protocol version 2 host key algorithms  Specfies the protocol version 2 host key algorithms
 that the client wants to use in order of preference.  that the client wants to use in order of preference.
 The default for this option is:  The default for this option is:
 .Dq ssh-rsa,ssh-dss  .Dq ssh-rsa,ssh-dss
   .It Cm HostKeyAlias
   Specifies an alias that should be used instead of the
   real host name when looking up or saving the host key
   in the host key database files.
   This option is useful for tunneling ssh connections
   or if you have multiple servers running on a single host.
 .It Cm HostName  .It Cm HostName
 Specifies the real host name to log into.  Specifies the real host name to log into.
 This can be used to specify nicknames or abbreviations for hosts.  This can be used to specify nicknames or abbreviations for hosts.
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 .Cm HostName  .Cm HostName
 specifications).  specifications).
 .It Cm IdentityFile  .It Cm IdentityFile
 Specifies the file from which the user's RSA authentication identity  Specifies the file from which the user's RSA or DSA authentication identity
 is read (default  is read (default
 .Pa $HOME/.ssh/identity  .Pa $HOME/.ssh/identity
 in the user's home directory).  in the user's home directory).
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 .Dq no .  .Dq no .
 The default is  The default is
 .Dq yes .  .Dq yes .
 Note that this option applies to both protocol version 1 and 2.  
 .It Cm Port  .It Cm Port
 Specifies the port number to connect on the remote host.  Specifies the port number to connect on the remote host.
 Default is 22.  Default is 22.
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 .Cm CheckHostIP  .Cm CheckHostIP
 is not available for connects with a proxy command.  is not available for connects with a proxy command.
 .Pp  .Pp
   .It Cm PubkeyAuthentication
   Specifies whether to try public key authentication.
   The argument to this keyword must be
   .Dq yes
   or
   .Dq no .
   The default is
   .Dq yes .
   This option applies to protocol version 2 only.
 .It Cm RemoteForward  .It Cm RemoteForward
 Specifies that a TCP/IP port on the remote machine be forwarded over  Specifies that a TCP/IP port on the remote machine be forwarded over
 the secure channel to given host:port from the local machine.  the secure channel to given host:port from the local machine.
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 authentication time on slow connections when rhosts authentication is  authentication time on slow connections when rhosts authentication is
 not used.  not used.
 Most servers do not permit RhostsAuthentication because it  Most servers do not permit RhostsAuthentication because it
 is not secure (see RhostsRSAAuthentication).  is not secure (see
   .Cm RhostsRSAAuthentication ).
 The argument to this keyword must be  The argument to this keyword must be
 .Dq yes  .Dq yes
 or  or
 .Dq no .  .Dq no .
 The default is  The default is
 .Dq yes .  .Dq yes .
   This option applies to protocol version 1 only.
 .It Cm RhostsRSAAuthentication  .It Cm RhostsRSAAuthentication
 Specifies whether to try rhosts based authentication with RSA host  Specifies whether to try rhosts based authentication with RSA host
 authentication.  authentication.
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 .Dq no .  .Dq no .
 The default is  The default is
 .Dq yes .  .Dq yes .
   This option applies to protocol version 1 only.
 .It Cm RSAAuthentication  .It Cm RSAAuthentication
 Specifies whether to try RSA authentication.  Specifies whether to try RSA authentication.
 The argument to this keyword must be  The argument to this keyword must be
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 .Dq no .  .Dq no .
 The default is  The default is
 .Dq no .  .Dq no .
 Note that setting this option to  Note that you need to set this option to
 .Dq no  .Dq yes
 turns off  if you want to use
 .Cm RhostsAuthentication  .Cm RhostsAuthentication
 and  and
 .Cm RhostsRSAAuthentication  .Cm RhostsRSAAuthentication
 for older servers.  with older servers.
 .It Cm User  .It Cm User
 Specifies the user to log in as.  Specifies the user to log in as.
 This can be useful if you have a different user name on different machines.  This can be useful if you have a different user name on different machines.
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 .Nm  .Nm
 uses this special value to forward X11 connections over the secure  uses this special value to forward X11 connections over the secure
 channel.  channel.
 The user should normally not set DISPLAY explicitly, as that  The user should normally not set
   .Ev DISPLAY
   explicitly, as that
 will render the X11 connection insecure (and will require the user to  will render the X11 connection insecure (and will require the user to
 manually copy any required authorization cookies).  manually copy any required authorization cookies).
 .It Ev HOME  .It Ev HOME
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 This file is not highly sensitive, but the recommended  This file is not highly sensitive, but the recommended
 permissions are read/write for the user, and not accessible by others.  permissions are read/write for the user, and not accessible by others.
 .It Pa $HOME/.ssh/authorized_keys2  .It Pa $HOME/.ssh/authorized_keys2
 Lists the public keys (DSA/RSA) that can be used for logging in as this user.  Lists the public keys (RSA/DSA) that can be used for logging in as this user.
 This file is not highly sensitive, but the recommended  This file is not highly sensitive, but the recommended
 permissions are read/write for the user, and not accessible by others.  permissions are read/write for the user, and not accessible by others.
 .It Pa /etc/ssh_known_hosts, /etc/ssh_known_hosts2  .It Pa /etc/ssh_known_hosts, /etc/ssh_known_hosts2
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 .Pa /etc/ssh_known_hosts  .Pa /etc/ssh_known_hosts
 contains RSA and  contains RSA and
 .Pa /etc/ssh_known_hosts2  .Pa /etc/ssh_known_hosts2
 contains DSA or RSA keys for protocol version 2.  contains RSA or DSA keys for protocol version 2.
 These files should be prepared by the  These files should be prepared by the
 system administrator to contain the public host keys of all machines in the  system administrator to contain the public host keys of all machines in the
 organization.  organization.
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  Added in v.1.107