doesn't conflict with openssh.
Changes since 0.50:
0.52 - Wed 12 November 2008
- Add "netcat-alike" option (-B) to dbclient, allowing Dropbear to
tunnel standard input/output to a TCP port-forwarded remote host.
- Add "proxy command" support to dbclient, to allow using a spawned
process for IO rather than a direct TCP connection. eg
dbclient remotehost
is equivalent to
dbclient -J 'nc remotehost 22' remotehost
(the hostname is still provided purely for looking up saved host keys)
- Combine netcat-alike and proxy support to allow "multihop"
connections, with comma-separated host syntax. Allows running
dbclient user1@host1,user2@host2,user3@host3
to end up at host3 via the other two, using SSH TCP forwarding. It's
a bit like onion-routing. All connections are established from the
local machine. The comma-separated syntax can also be used for
scp/rsync, eg
rsync -a -e dbclient m@gateway,m2@host,martello:/home/matt/ ~/backup/
to bounce through a few hosts.
- Add -I "idle timeout" option (contributed by Farrell Aultman)
- Allow restrictions on authorized_keys logins such as restricting
commands to be run etc. This is a subset of those allowed by OpenSSH,
doesn't yet allow restricting source host.
- Use vfork() for scp on uClinux
- Default to PATH=/usr/bin:/bin for shells.
- Report errors if -R forwarding fails
- Add counter mode cipher support, which avoids some security problems
with the standard CBC mode.
- Support zlib@openssh.com delayed compression for client/server. It
can be required for the Dropbear server with the '-Z' option. This
is useful for security as it avoids exposing the server to attacks
on zlib by unauthenticated remote users, though requires client side
support.
- options.h has been split into options.h (user-changable) and
sysoptions.h (less commonly changed)
- Support "dbclient -s sftp" to specify a subsystem
- Fix a bug in replies to channel requests that could be triggered by
recent versions of PuTTY
0.51 - Thu 27 March 2008
- Make a copy of password fields rather erroneously relying on getwpnam()
to be safe to call multiple times
- If $SSH_ASKPASS_ALWAYS environment variable is set (and $SSH_ASKPASS is
as well) always use that program, ignoring isatty() and $DISPLAY
- Wait until a process exits before the server closes a connection, so
that an exit code can be sent. This fixes problems with exit codes not
being returned, which could cause scp to fail.
changes:
-IPv6 support
-client added
-bugfixes
XXX dropbear wants to use /dev/random per default now which makes it
unusable on systems w/o entropy source. I've patched it back to
/dev/urandom. There might be security concerns.
The search for a small Secure Shell server to fit on a laptop with 4
megs ram and no hard disk was fruitless, so Matt Johnston decided to
write his own, and Dropbear is the result. It implements various
features of the SSH 2 protocol, including X11 and Authentication Agent
forwarding. Dropbear is Open Source software, distributed under a
MIT-style license.
Features
* A small memory footprint - Dropbear can compile to a 110kB
statically linked binary with uClibc (and only minimal options
selected).
* Implements X11 forwarding, and authentication-agent forwarding
for OpenSSH clients
* Compatible with OpenSSH ~/.ssh/authorized_keys public key
authentication
* Features can easily be disabled when compiling to save space.
* Preliminary TCP forwarding support (-L style only)
