Files in jni/dropbear/ of trunk
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Files in directory jni/dropbear from the latest check-in of branch trunk

  • _MTN
  • debian
  • libtomcrypt
  • libtommath
  • sftp-server
  • agentfwd.h
  • algo.h
  • Android.mk
  • atomicio.c
  • atomicio.h
  • auth.h
  • bignum.c
  • bignum.h
  • buffer.c
  • buffer.h
  • CHANGES
  • channel.h
  • chansession.h
  • circbuffer.c
  • circbuffer.h
  • CleanSpec.mk
  • cli-agentfwd.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-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.ac
  • crypto_desc.c
  • crypto_desc.h
  • curve25519-donna.c
  • dbclient.1
  • dbmulti.c
  • dbrandom.c
  • dbrandom.h
  • dbutil.c
  • dbutil.h
  • debug.h
  • dropbear.8
  • dropbearconvert.1
  • dropbearconvert.c
  • dropbearkey.1
  • dropbearkey.c
  • dss.c
  • dss.h
  • ecc.c
  • ecc.h
  • ecdsa.c
  • ecdsa.h
  • fake-rfc2553.c
  • fake-rfc2553.h
  • filelist.txt
  • gendss.c
  • gendss.h
  • genrsa.c
  • genrsa.h
  • gensignkey.c
  • gensignkey.h
  • includes.h
  • INSTALL
  • install-sh
  • kex.h
  • keyimport.c
  • keyimport.h
  • LICENSE
  • list.c
  • list.h
  • listener.c
  • listener.h
  • loginrec.c
  • loginrec.h
  • ltc_prng.c
  • ltc_prng.h
  • Makefile.in
  • MODULE_LICENSE_BSD_LIKE
  • MULTI
  • netbsd_getpass.c
  • options.h
  • packet.c
  • packet.h
  • process-packet.c
  • progressmeter.c
  • progressmeter.h
  • queue.c
  • queue.h
  • README
  • rsa.c
  • rsa.h
  • runopts.h
  • scp.c
  • scpmisc.c
  • scpmisc.h
  • service.h
  • session.h
  • signkey.c
  • signkey.h
  • SMALL
  • ssh.h
  • sshpty.c
  • sshpty.h
  • svr-agentfwd.c
  • svr-auth.c
  • svr-authpam.c
  • svr-authpasswd.c
  • svr-authpubkey.c
  • svr-authpubkeyoptions.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
  • sysoptions.h
  • tcp-accept.c
  • tcpfwd.h
  • termcodes.c
  • termcodes.h
  • TODO
  • x11fwd.h

This is Dropbear, a smallish SSH server and client.
https://matt.ucc.asn.au/dropbear/dropbear.html

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.

Dropbear supports some options for authorized_keys entries, see the manpage.

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

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>

Dropbear does not support encrypted hostkeys though can connect to ssh-agent.

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

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 server keys, this is one-off:
./dropbearkey -t rsa -f dropbear_rsa_host_key
./dropbearkey -t dss -f dropbear_dss_host_key
./dropbearkey -t ecdsa -f dropbear_ecdsa_host_key

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

You can also get Dropbear to create keys when the first connection is made -
this is preferable to generating keys when the system boots. Make sure 
/etc/dropbear/ exists and then pass '-R' to the dropbear server.

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

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.