annotate README @ 1760:2406a9987810 default tip fuzz

Add first try at fuzzing custom mutator
author Matt Johnston <matt@ucc.asn.au>
date Sun, 25 Oct 2020 22:52:36 +0800
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1 This is Dropbear, a smallish SSH 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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10
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11 Please contact me if you have any questions/bugs found/features/ideas/comments etc :)
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12 There is also a mailing list http://lists.ucc.gu.uwa.edu.au/mailman/listinfo/dropbear
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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= [email protected]
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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 Dropbear does not support encrypted hostkeys though can connect to ssh-agent.
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47 ============================================================================
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49 If you want to get the public-key portion of a Dropbear private key, look at
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50 dropbearkey's '-y' option.
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52 ============================================================================
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54 To run the server, you need to generate server keys, this is one-off:
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55 ./dropbearkey -t rsa -f dropbear_rsa_host_key
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56 ./dropbearkey -t dss -f dropbear_dss_host_key
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57 ./dropbearkey -t ecdsa -f dropbear_ecdsa_host_key
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58 ./dropbearkey -t ed25519 -f dropbear_ed25519_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 You can also get Dropbear to create keys when the first connection is made -
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64 this is preferable to generating keys when the system boots. Make sure
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65 /etc/dropbear/ exists and then pass '-R' to the dropbear server.
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67 ============================================================================
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69 If the server is run as non-root, you most likely won't be able to allocate a
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70 pty, and you cannot login as any user other than that running the daemon
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71 (obviously). Shadow passwords will also be unusable as non-root.
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73 ============================================================================
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75 The Dropbear distribution includes a standalone version of OpenSSH's scp
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76 program. You can compile it with "make scp", you may want to change the path
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77 of the ssh binary, specified by _PATH_SSH_PROGRAM in options.h . By default
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78 the progress meter isn't compiled in to save space, you can enable it by
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79 adding 'SCPPROGRESS=1' to the make commandline.