annotate README @ 711:f4232b65b316

Fix "-m none" case where an entire packet fits in a block and can be read by read_packet_init()
author Matt Johnston <matt@ucc.asn.au>
date Wed, 20 Mar 2013 23:13:19 +0800
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children 74deece07742
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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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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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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 NOTE: Dropbear ignores authorized_keys options such as those described in the
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32 OpenSSH sshd manpage, and will not allow a login for these keys.
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34 ============================================================================
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36 Client public key auth:
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38 Dropbear can do public key auth as a client, but you will have to convert
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39 OpenSSH style keys to Dropbear format, or use dropbearkey to create them.
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41 If you have an OpenSSH-style private key ~/.ssh/id_rsa, you need to do:
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43 dropbearconvert openssh dropbear ~/.ssh/id_rsa ~/.ssh/id_rsa.db
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44 dbclient -i ~/.ssh/id_rsa.db <hostname>
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46 Currently encrypted keys aren't supported, neither is agent forwarding. At some
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47 stage both hopefully will be.
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49 ============================================================================
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51 If you want to get the public-key portion of a Dropbear private key, look at
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52 dropbearkey's '-y' option.
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54 ============================================================================
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56 To run the server, you need to generate server keys, this is one-off:
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57 ./dropbearkey -t rsa -f dropbear_rsa_host_key
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58 ./dropbearkey -t dss -f dropbear_dss_host_key
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60 or alternatively convert OpenSSH keys to Dropbear:
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61 ./dropbearconvert openssh dropbear /etc/ssh/ssh_host_dsa_key dropbear_dss_host_key
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63 ============================================================================
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65 If the server is run as non-root, you most likely won't be able to allocate a
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66 pty, and you cannot login as any user other than that running the daemon
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67 (obviously). Shadow passwords will also be unusable as non-root.
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71 The Dropbear distribution includes a standalone version of OpenSSH's scp
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72 program. You can compile it with "make scp", you may want to change the path
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73 of the ssh binary, specified by _PATH_SSH_PROGRAM in options.h . By default
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74 the progress meter isn't compiled in to save space, you can enable it by
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75 adding 'SCPPROGRESS=1' to the make commandline.