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_MTN
debian
libtomcrypt
libtommath
Android.mk
CHANGES
CleanSpec.mk
INSTALL
LICENSE
MODULE_LICENSE_BSD_LIKE
MULTI
Makefile.in
NOTICE
README
SMALL
TODO
agentfwd.h
algo.h
atomicio.c
atomicio.h
auth.h
bignum.c
bignum.h
buffer.c
buffer.h
channel.h
chansession.h
circbuffer.c
circbuffer.h
cli-algo.c
cli-auth.c
cli-authinteract.c
cli-authpasswd.c
cli-authpubkey.c
cli-channel.c
cli-chansession.c
cli-kex.c
cli-main.c
cli-runopts.c
cli-service.c
cli-session.c
cli-tcpfwd.c
common-algo.c
common-channel.c
common-chansession.c
common-kex.c
common-runopts.c
common-session.c
compat.c
compat.h
config.guess
config.h
config.h.in
config.sub
configure
configure.in
dbclient.1
dbmulti.c
dbutil.c
dbutil.h
debug.h
dropbear.8
dropbearconvert.c
dropbearkey.8
dropbearkey.c
dss.c
dss.h
fake-rfc2553.c
fake-rfc2553.h
filelist.txt
gendss.c
gendss.h
genrsa.c
genrsa.h
includes.h
install-sh
kex.h
keyimport.c
keyimport.h
listener.c
listener.h
loginrec.c
loginrec.h
netbsd_getpass.c
options.h
packet.c
packet.h
process-packet.c
progressmeter.c
progressmeter.h
queue.c
queue.h
random.c
random.h
rsa.c
rsa.h
runopts.h
scp.c
scpmisc.c
scpmisc.h
service.h
session.h
signkey.c
signkey.h
ssh.h
sshpty.c
sshpty.h
svr-agentfwd.c
svr-algo.c
svr-auth.c
svr-authpam.c
svr-authpasswd.c
svr-authpubkey.c
svr-chansession.c
svr-kex.c
svr-main.c
svr-runopts.c
svr-service.c
svr-session.c
svr-tcpfwd.c
svr-x11fwd.c
tcp-accept.c
tcpfwd.h
termcodes.c
termcodes.h
x11fwd.h

README

This is Dropbear, a smallish SSH 2 server and client.

INSTALL has compilation instructions.

MULTI has instructions on making a multi-purpose binary (ie a single binary
which performs multiple tasks, to save disk space)

SMALL has some tips on creating small binaries.

See TODO for a few of the things I know need looking at, and please contact
me if you have any questions/bugs found/features/ideas/comments etc :)

Matt Johnston
matt@ucc.asn.au


In the absence of detailed documentation, some notes follow:
============================================================================

Server public key auth:

You can use ~/.ssh/authorized_keys in the same way as with OpenSSH, just put
the key entries in that file. They should be of the form:

ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAwVa6M6cGVmUcLl2cFzkxEoJd06Ub4bVDsYrWvXhvUV+ZAM9uGuewZBDoAqNKJxoIn0Hyd0Nk/yU99UVv6NWV/5YSHtnf35LKds56j7cuzoQpFIdjNwdxAN0PCET/MG8qyskG/2IE2DPNIaJ3Wy+Ws4IZEgdJgPlTYUBWWtCWOGc= someone@hostname

You must make sure that ~/.ssh, and the key file, are only writable by the
user. Beware of editors that split the key into multiple lines.

NOTE: Dropbear ignores authorized_keys options such as those described in the
OpenSSH sshd manpage, and will not allow a login for these keys. 

============================================================================

Client public key auth:

Dropbear can do public key auth as a client, but you will have to convert
OpenSSH style keys to Dropbear format, or use dropbearkey to create them.

If you have an OpenSSH-style private key ~/.ssh/id_rsa, you need to do:

dropbearconvert openssh dropbear ~/.ssh/id_rsa  ~/.ssh/id_rsa.db
dbclient -i ~/.ssh/id_rsa.db <hostname>

Currently encrypted keys aren't supported, neither is agent forwarding. At some
stage both hopefully will be.

============================================================================

If you want to get the public-key portion of a Dropbear private key, look at
dropbearkey's '-y' option.

============================================================================

To run the server, you need to generate server keys, this is one-off:
./dropbearkey -t rsa -f dropbear_rsa_host_key
./dropbearkey -t dss -f dropbear_dss_host_key

or alternatively convert OpenSSH keys to Dropbear:
./dropbearconvert openssh dropbear /etc/ssh/ssh_host_dsa_key dropbear_dss_host_key

============================================================================

If the server is run as non-root, you most likely won't be able to allocate a
pty, and you cannot login as any user other than that running the daemon
(obviously). Shadow passwords will also be unusable as non-root.

============================================================================

The Dropbear distribution includes a standalone version of OpenSSH's scp
program. You can compile it with "make scp", you may want to change the path
of the ssh binary, specified by _PATH_SSH_PROGRAM in options.h . By default
the progress meter isn't compiled in to save space, you can enable it by 
adding 'SCPPROGRESS=1' to the make commandline.