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- (djm) OpenBSD CVS Sync 

- jmc@cvs.openbsd.org 2006/02/01 09:06:50
     [sshd.8]
     - merge sections on protocols 1 and 2 into a single section
     - remove configuration file section
     ok markus
This commit is contained in:
Damien Miller 2006-02-01 22:05:25 +11:00
parent e682cb0780
commit 8bbdf90f33
2 changed files with 41 additions and 46 deletions
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8
ChangeLog
View File

@ -2,6 +2,12 @@
- (djm) [regress/test-exec.sh] Try 'logname' as well as 'whoami' to
determine the user's login name - needed for regress tests on Solaris
10 and OpenSolaris
- (djm) OpenBSD CVS Sync
- jmc@cvs.openbsd.org 2006/02/01 09:06:50
[sshd.8]
- merge sections on protocols 1 and 2 into a single section
- remove configuration file section
ok markus
20060131
- (djm) OpenBSD CVS Sync
@ -3803,4 +3809,4 @@
- (djm) Trim deprecated options from INSTALL. Mention UsePAM
- (djm) Fix quote handling in sftp; Patch from admorten AT umich.edu
$Id: ChangeLog,v 1.4113 2006/02/01 00:21:01 djm Exp $
$Id: ChangeLog,v 1.4114 2006/02/01 11:05:25 djm Exp $

79
sshd.8
View File

@ -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: sshd.8,v 1.213 2006/01/25 09:07:22 jmc Exp $
.\" $OpenBSD: sshd.8,v 1.214 2006/02/01 09:06:50 jmc Exp $
.Dd September 25, 1999
.Dt SSHD 8
.Os
@ -227,20 +227,26 @@ USER@HOST pattern in
or
.Cm DenyUsers .
.El
.Sh AUTHENTICATION
The OpenSSH SSH daemon supports SSH protocols 1 and 2.
Both protocols are supported by default,
though this can be changed via the
.Cm Protocol
option in
.Xr sshd_config 5 .
Protocol 2 supports both RSA and DSA keys;
protocol 1 only supports RSA keys.
For both protocols,
each host has a host-specific key,
normally 2048 bits,
used to identify the host.
.Pp
This implementation of
.Nm
supports both SSH protocol version 1 and 2 simultaneously.
.Nm
works as follows:
.Sh SSH PROTOCOL VERSION 1
Each host has a host-specific RSA key
(normally 2048 bits) used to identify the host.
Additionally, when
the daemon starts, it generates a server RSA key (normally 768 bits).
Forward security for protocol 1 is provided through
an additional server key,
normally 768 bits,
generated when the server starts.
This key is normally regenerated every hour if it has been used, and
is never stored on disk.
.Pp
Whenever a client connects, the daemon responds with its public
host and server keys.
The client compares the
@ -258,12 +264,23 @@ being used by default.
The client selects the encryption algorithm
to use from those offered by the server.
.Pp
Next, the server and the client enter an authentication dialog.
For protocol 2,
forward security is provided through a Diffie-Hellman key agreement.
This key agreement results in a shared session key.
The rest of the session is encrypted using a symmetric cipher, currently
128-bit AES, Blowfish, 3DES, CAST128, Arcfour, 192-bit AES, or 256-bit AES.
The client selects the encryption algorithm
to use from those offered by the server.
Additionally, session integrity is provided
through a cryptographic message authentication code
(hmac-sha1 or hmac-md5).
.Pp
Finally, the server and the client enter an authentication dialog.
The client tries to authenticate itself using
.Em rhosts
authentication combined with RSA host
authentication, RSA challenge-response authentication, or password
based authentication.
host-based authentication,
public key authentication,
challenge-response authentication,
or password authentication.
.Pp
Regardless of the authentication type, the account is checked to
ensure that it is accessible. An account is not accessible if it is
@ -301,25 +318,6 @@ are disabled (thus completely disabling
and
.Xr rsh
into the machine).
.Sh SSH PROTOCOL VERSION 2
Version 2 works similarly:
Each host has a host-specific key (RSA or DSA) used to identify the host.
However, when the daemon starts, it does not generate a server key.
Forward security is provided through a Diffie-Hellman key agreement.
This key agreement results in a shared session key.
.Pp
The rest of the session is encrypted using a symmetric cipher, currently
128-bit AES, Blowfish, 3DES, CAST128, Arcfour, 192-bit AES, or 256-bit AES.
The client selects the encryption algorithm
to use from those offered by the server.
Additionally, session integrity is provided
through a cryptographic message authentication code
(hmac-sha1 or hmac-md5).
.Pp
Protocol version 2 provides a public key based
user (PubkeyAuthentication) or
client host (HostbasedAuthentication) authentication method,
conventional password authentication and challenge response based methods.
.Sh COMMAND EXECUTION AND DATA FORWARDING
If the client successfully authenticates itself, a dialog for
preparing the session is entered.
@ -337,15 +335,6 @@ command on the server side, and the user terminal in the client side.
When the user program terminates and all forwarded X11 and other
connections have been closed, the server sends command exit status to
the client, and both sides exit.
.Sh CONFIGURATION FILE
.Nm
reads configuration data from
.Pa /etc/ssh/sshd_config
(or the file specified with
.Fl f
on the command line).
The file format and configuration options are described in
.Xr sshd_config 5 .
.Sh LOGIN PROCESS
When a user successfully logs in,
.Nm