sshd.8 (42f71286cde4107ce6327244cc3c6442c5dc66a6) sshd.8 (fe5fd0173b1983e53ba8dbafb3229b37444e7986)
1.\" -*- nroff -*-
2.\"
3.\" sshd.8.in
4.\"
5.\" Author: Tatu Ylonen <ylo@cs.hut.fi>
6.\"
7.\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8.\" All rights reserved
9.\"
10.\" Created: Sat Apr 22 21:55:14 1995 ylo
11.\"
1.\" -*- nroff -*-
2.\"
3.\" sshd.8.in
4.\"
5.\" Author: Tatu Ylonen <ylo@cs.hut.fi>
6.\"
7.\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8.\" All rights reserved
9.\"
10.\" Created: Sat Apr 22 21:55:14 1995 ylo
11.\"
12.\" $Id: sshd.8,v 1.33 2000/02/21 14:19:09 deraadt Exp $
12.\" $Id: sshd.8,v 1.34 2000/02/24 18:22:16 markus Exp $
13.\" $FreeBSD$
14.\"
15.Dd September 25, 1999
16.Dt SSHD 8
17.Os
18.Sh NAME
19.Nm sshd
20.Nd secure shell daemon

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279the user name.
280.It Cm HostKey
281Specifies the file containing the private host key (default
282.Pa /etc/ssh_host_key ) .
283Note that
284.Nm
285does not start if this file is group/world-accessible.
286.It Cm IgnoreRhosts
13.\" $FreeBSD$
14.\"
15.Dd September 25, 1999
16.Dt SSHD 8
17.Os
18.Sh NAME
19.Nm sshd
20.Nd secure shell daemon

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279the user name.
280.It Cm HostKey
281Specifies the file containing the private host key (default
282.Pa /etc/ssh_host_key ) .
283Note that
284.Nm
285does not start if this file is group/world-accessible.
286.It Cm IgnoreRhosts
287Specifies that rhosts and shosts files will not be used in
288authentication.
287Specifies that
288.Pa .rhosts
289and
290.Pa .shosts
291files will not be used in authentication.
289.Pa /etc/hosts.equiv
290and
291.Pa /etc/shosts.equiv
292are still used. The default is
292.Pa /etc/hosts.equiv
293and
294.Pa /etc/shosts.equiv
295are still used. The default is
293.Dq no .
296.Dq yes .
294.It Cm IgnoreUserKnownHosts
295Specifies whether
296.Nm
297should ignore the user's
298.Pa $HOME/.ssh/known_hosts
299during
300.Cm RhostsRSAAuthentication .
301The default is

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373.It Cm PasswordAuthentication
374Specifies whether password authentication is allowed.
375The default is
376.Dq yes .
377.It Cm PermitEmptyPasswords
378When password authentication is allowed, it specifies whether the
379server allows login to accounts with empty password strings. The default
380is
297.It Cm IgnoreUserKnownHosts
298Specifies whether
299.Nm
300should ignore the user's
301.Pa $HOME/.ssh/known_hosts
302during
303.Cm RhostsRSAAuthentication .
304The default is

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376.It Cm PasswordAuthentication
377Specifies whether password authentication is allowed.
378The default is
379.Dq yes .
380.It Cm PermitEmptyPasswords
381When password authentication is allowed, it specifies whether the
382server allows login to accounts with empty password strings. The default
383is
381.Dq yes .
384.Dq no .
382.It Cm PermitRootLogin
383Specifies whether the root can log in using
384.Xr ssh 1 .
385The argument must be
386.Dq yes ,
387.Dq without-password
388or
389.Dq no .

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424should be used
425instead, because it performs RSA-based host authentication in addition
426to normal rhosts or /etc/hosts.equiv authentication.
427The default is
428.Dq no .
429.It Cm RhostsRSAAuthentication
430Specifies whether rhosts or /etc/hosts.equiv authentication together
431with successful RSA host authentication is allowed. The default is
385.It Cm PermitRootLogin
386Specifies whether the root can log in using
387.Xr ssh 1 .
388The argument must be
389.Dq yes ,
390.Dq without-password
391or
392.Dq no .

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427should be used
428instead, because it performs RSA-based host authentication in addition
429to normal rhosts or /etc/hosts.equiv authentication.
430The default is
431.Dq no .
432.It Cm RhostsRSAAuthentication
433Specifies whether rhosts or /etc/hosts.equiv authentication together
434with successful RSA host authentication is allowed. The default is
432.Dq yes .
435.Dq no .
433.It Cm RSAAuthentication
434Specifies whether pure RSA authentication is allowed. The default is
435.Dq yes .
436.It Cm ServerKeyBits
437Defines the number of bits in the server key. The minimum value is
438512, and the default is 768.
439.It Cm SkeyAuthentication
440Specifies whether

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463is used. The default is
464.Dq no .
465.It Cm X11DisplayOffset
466Specifies the first display number available for
467.Nm sshd Ns 's
468X11 forwarding. This prevents
469.Nm
470from interfering with real X11 servers.
436.It Cm RSAAuthentication
437Specifies whether pure RSA authentication is allowed. The default is
438.Dq yes .
439.It Cm ServerKeyBits
440Defines the number of bits in the server key. The minimum value is
441512, and the default is 768.
442.It Cm SkeyAuthentication
443Specifies whether

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466is used. The default is
467.Dq no .
468.It Cm X11DisplayOffset
469Specifies the first display number available for
470.Nm sshd Ns 's
471X11 forwarding. This prevents
472.Nm
473from interfering with real X11 servers.
474The default is 10.
471.It Cm X11Forwarding
472Specifies whether X11 forwarding is permitted. The default is
473.Dq yes .
474Note that disabling X11 forwarding does not improve security in any
475way, as users can always install their own forwarders.
476.El
477.Sh LOGIN PROCESS
478When a user successfully logs in,

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475.It Cm X11Forwarding
476Specifies whether X11 forwarding is permitted. The default is
477.Dq yes .
478Note that disabling X11 forwarding does not improve security in any
479way, as users can always install their own forwarders.
480.El
481.Sh LOGIN PROCESS
482When a user successfully logs in,

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