Dropbear, a smallish SSH server and client.
INSTALL has compilation instructions.
MULTI has instructions on making a multi-purpose binary (i.e., a single binary which performs multiple tasks to save disk space)
SMALL has some tips on creating small binaries.
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.
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 it 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 generate 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
./dropbearkey -t ed25519 -f dropbear_ed25519_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,
which 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 withmake scp
; you may want to change the path of the ssh binary, specified by_PATH_SSH_PROGRAM
inoptions.h
. By default, the progress meter isn't compiled to save space. You can enable it by addingSCPPROGRESS=1
to the make commandline.
Please contact me if you have any questions/bugs found/features/ideas/comments etc :) There is also a mailing list http://lists.ucc.gu.uwa.edu.au/mailman/listinfo/dropbear
Matt Johnston matt@ucc.asn.au