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author Matt Johnston <matt@ucc.asn.au>
date Thu, 18 Apr 2013 23:15:17 +0800
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1 This is Dropbear, a smallish SSH 2 server and client.
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2 https://matt.ucc.asn.au/dropbear/dropbear.html
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4 INSTALL has compilation instructions.
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6 MULTI has instructions on making a multi-purpose binary (ie a single binary
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7 which performs multiple tasks, to save disk space)
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8
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9 SMALL has some tips on creating small binaries.
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11 See TODO for a few of the things I know need looking at, and please contact
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12 me if you have any questions/bugs found/features/ideas/comments etc :)
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14 Matt Johnston
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15 [email protected]
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18 In the absence of detailed documentation, some notes follow:
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19 ============================================================================
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20
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21 Server public key auth:
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23 You can use ~/.ssh/authorized_keys in the same way as with OpenSSH, just put
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24 the key entries in that file. They should be of the form:
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26 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAwVa6M6cGVmUcLl2cFzkxEoJd06Ub4bVDsYrWvXhvUV+ZAM9uGuewZBDoAqNKJxoIn0Hyd0Nk/yU99UVv6NWV/5YSHtnf35LKds56j7cuzoQpFIdjNwdxAN0PCET/MG8qyskG/2IE2DPNIaJ3Wy+Ws4IZEgdJgPlTYUBWWtCWOGc= someone@hostname
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28 You must make sure that ~/.ssh, and the key file, are only writable by the
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29 user. Beware of editors that split the key into multiple lines.
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31 Dropbear supports some options for authorized_keys entries, see the manpage.
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33 ============================================================================
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35 Client public key auth:
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37 Dropbear can do public key auth as a client, but you will have to convert
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38 OpenSSH style keys to Dropbear format, or use dropbearkey to create them.
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40 If you have an OpenSSH-style private key ~/.ssh/id_rsa, you need to do:
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42 dropbearconvert openssh dropbear ~/.ssh/id_rsa ~/.ssh/id_rsa.db
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43 dbclient -i ~/.ssh/id_rsa.db <hostname>
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45 Currently encrypted keys aren't supported, neither is agent forwarding. At some
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46 stage both hopefully will be.
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48 ============================================================================
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49
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50 If you want to get the public-key portion of a Dropbear private key, look at
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51 dropbearkey's '-y' option.
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53 ============================================================================
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55 To run the server, you need to generate server keys, this is one-off:
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56 ./dropbearkey -t rsa -f dropbear_rsa_host_key
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57 ./dropbearkey -t dss -f dropbear_dss_host_key
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58
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59 or alternatively convert OpenSSH keys to Dropbear:
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60 ./dropbearconvert openssh dropbear /etc/ssh/ssh_host_dsa_key dropbear_dss_host_key
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62 ============================================================================
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64 If the server is run as non-root, you most likely won't be able to allocate a
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65 pty, and you cannot login as any user other than that running the daemon
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66 (obviously). Shadow passwords will also be unusable as non-root.
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68 ============================================================================
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70 The Dropbear distribution includes a standalone version of OpenSSH's scp
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71 program. You can compile it with "make scp", you may want to change the path
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72 of the ssh binary, specified by _PATH_SSH_PROGRAM in options.h . By default
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73 the progress meter isn't compiled in to save space, you can enable it by
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74 adding 'SCPPROGRESS=1' to the make commandline.