Wednesday, March 9, 2005

OpenSSH 4.0 released

OpenSSH 4.0 and the portable version 4.0p1 have been released today.

Here are the changes since 3.9 as reported in the announcement email, I've just edited and formatted them as when copying from the email they don't display very well.

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* ssh(1) now allows the optional specification of an address to bind to in port forwarding connections (local, remote and dynamic). Please refer to the documentation for the -L and -R options in the ssh(1) manual page and the LocalForward and RemoteForward options in the ssh_config(5) manpage. (Bugzilla #413)

* To control remote bindings while retaining backwards compatibility, sshd(8)'s GatewayPorts option has been extended. To allow client specified bind addresses for remote (-R) port forwardings, the server must be
configured with "GatewayPorts clientspecified".

* ssh(1) and ssh-keyscan(1) now support hashing of host names and addresses added to known_hosts files, controlled by the ssh(1) HashKnownHosts configuration directive. This option improves user privacy by hiding which hosts have been visited. At present this option is off by default, but may be turned on once it receives sufficient testing to confirm stability.

* Added options for managing keys in known_hosts files to ssh-keygen (1), including the ability to search for hosts by name, delete hosts by name and convert a known_hosts file over to one with hashed names. These are particularly useful for managing known_hosts files with hashed names that are stored in the file.

* Improve account and password expiry support in sshd(8). Ther server will now warn in advance,
for both account and password expiry.

* sshd(8) will now log the source of connections denied by AllowUsers, DenyUsers, AllowGroups and DenyGroups.
See Bugzilla #909.

* Added the AddressFamily option to sshd(8) to allow global control over IPv4/IPv6 usage. See Bugzilla #989.

* Improved sftp(1) client, including fixes for the ``ls'' command and command history and editing support using libedit.

* Improved the handling of bad data in authorized_keys files, eliminating fatal errors on corrupt or very large keys.
See Bugzilla #884.

* Improved connection multiplexing support in ssh(1). Several bugs have been fixed and a new "command mode" has been added to allow the control of a running multiplexing master connection, including checking that it is up,
determining its PID and asking it to exit.

* Have scp(1) and sftp(1) wait for the spawned ssh to exit before they exit themselves. This prevents ssh from being unable to restore terminal modes (not normally a problem on OpenBSD but common with OpenSSH portable on POSIX platforms).
See Bugzilla #950.

* Portable OpenSSH:

- Add *EXPERIMENTAL* BSM audit support for Solaris systems
See Bugzilla #125.

- Enable IPv6 on AIX where possible (see README.platform for details), working around a misfeature of AIX's getnameinfo.
See Bugzilla #835.

- Teach sshd(8) to write failed login records to btmp for unsuccessful login attempts. Currently this is only for password, keyboard-interactive and challenge/response authentication methods and only on Linux and HP-UX.

- sshd(8) now sends output from failing PAM session modules to the user before exiting,
similar to the way /etc/nologin is handled.

- Store credentials from gssapi-with-mic authentication early enough to be available to
PAM session modules when privsep=yes.

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There are lots of changes and improvements so worth upgrading the current OpenSSH server running on your systems, if you use OpenSSH of course.

Post ID: 687, posted by jase at 04:01 PM
Permalink | TrackBack ID: 660, (4) | Category: Security | Google Search
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