Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 1 | .\" $OpenBSD: ssh-keysign.8,v 1.14 2013/12/07 11:58:46 naddy Exp $ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 2 | .\" |
| 3 | .\" Copyright (c) 2002 Markus Friedl. All rights reserved. |
| 4 | .\" |
| 5 | .\" Redistribution and use in source and binary forms, with or without |
| 6 | .\" modification, are permitted provided that the following conditions |
| 7 | .\" are met: |
| 8 | .\" 1. Redistributions of source code must retain the above copyright |
| 9 | .\" notice, this list of conditions and the following disclaimer. |
| 10 | .\" 2. Redistributions in binary form must reproduce the above copyright |
| 11 | .\" notice, this list of conditions and the following disclaimer in the |
| 12 | .\" documentation and/or other materials provided with the distribution. |
| 13 | .\" |
| 14 | .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 15 | .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 16 | .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 17 | .\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 18 | .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 19 | .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 20 | .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 25 | .Dd $Mdocdate: December 7 2013 $ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 26 | .Dt SSH-KEYSIGN 8 |
| 27 | .Os |
| 28 | .Sh NAME |
| 29 | .Nm ssh-keysign |
| 30 | .Nd ssh helper program for host-based authentication |
| 31 | .Sh SYNOPSIS |
| 32 | .Nm |
| 33 | .Sh DESCRIPTION |
| 34 | .Nm |
| 35 | is used by |
| 36 | .Xr ssh 1 |
| 37 | to access the local host keys and generate the digital signature |
| 38 | required during host-based authentication with SSH protocol version 2. |
| 39 | .Pp |
| 40 | .Nm |
| 41 | is disabled by default and can only be enabled in the |
| 42 | global client configuration file |
| 43 | .Pa /etc/ssh/ssh_config |
| 44 | by setting |
| 45 | .Cm EnableSSHKeysign |
| 46 | to |
| 47 | .Dq yes . |
| 48 | .Pp |
| 49 | .Nm |
| 50 | is not intended to be invoked by the user, but from |
| 51 | .Xr ssh 1 . |
| 52 | See |
| 53 | .Xr ssh 1 |
| 54 | and |
| 55 | .Xr sshd 8 |
| 56 | for more information about host-based authentication. |
| 57 | .Sh FILES |
| 58 | .Bl -tag -width Ds -compact |
| 59 | .It Pa /etc/ssh/ssh_config |
| 60 | Controls whether |
| 61 | .Nm |
| 62 | is enabled. |
| 63 | .Pp |
| 64 | .It Pa /etc/ssh/ssh_host_dsa_key |
| 65 | .It Pa /etc/ssh/ssh_host_ecdsa_key |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 66 | .It Pa /etc/ssh/ssh_host_ed25519_key |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 67 | .It Pa /etc/ssh/ssh_host_rsa_key |
| 68 | These files contain the private parts of the host keys used to |
| 69 | generate the digital signature. |
| 70 | They should be owned by root, readable only by root, and not |
| 71 | accessible to others. |
| 72 | Since they are readable only by root, |
| 73 | .Nm |
| 74 | must be set-uid root if host-based authentication is used. |
| 75 | .Pp |
| 76 | .It Pa /etc/ssh/ssh_host_dsa_key-cert.pub |
| 77 | .It Pa /etc/ssh/ssh_host_ecdsa_key-cert.pub |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 78 | .It Pa /etc/ssh/ssh_host_ed25519_key-cert.pub |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 79 | .It Pa /etc/ssh/ssh_host_rsa_key-cert.pub |
| 80 | If these files exist they are assumed to contain public certificate |
| 81 | information corresponding with the private keys above. |
| 82 | .El |
| 83 | .Sh SEE ALSO |
| 84 | .Xr ssh 1 , |
| 85 | .Xr ssh-keygen 1 , |
| 86 | .Xr ssh_config 5 , |
| 87 | .Xr sshd 8 |
| 88 | .Sh HISTORY |
| 89 | .Nm |
| 90 | first appeared in |
| 91 | .Ox 3.2 . |
| 92 | .Sh AUTHORS |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 93 | .An Markus Friedl Aq Mt markus@openbsd.org |