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propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583) to branch 'au.asn.ucc.matt.dropbear' (head fff0894a0399405a9410ea1c6d118f342cf2aa64)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:49 +0000
parents b9d3f725e00b
children 94ee16f5b8a8
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1 This is Dropbear, a smallish SSH 2 server and client.
2
3 INSTALL has compilation instructions.
4
5 MULTI has instructions on making a multi-purpose binary (ie a single binary
6 which performs multiple tasks, to save disk space)
7
8 SMALL has some tips on creating small binaries.
9
10 See TODO for a few of the things I know need looking at, and please contact
11 me if you have any questions/bugs found/features/ideas/comments etc :)
12
13 Matt Johnston
14 [email protected]
15
16
17 In the absence of detailed documentation, some notes follow:
18 ============================================================================
19
20 Server public key auth:
21
22 You can use ~/.ssh/authorized_keys in the same way as with OpenSSH, just put
23 the key entries in that file. They should be of the form:
24
25 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAwVa6M6cGVmUcLl2cFzkxEoJd06Ub4bVDsYrWvXhvUV+ZAM9uGuewZBDoAqNKJxoIn0Hyd0Nk/yU99UVv6NWV/5YSHtnf35LKds56j7cuzoQpFIdjNwdxAN0PCET/MG8qyskG/2IE2DPNIaJ3Wy+Ws4IZEgdJgPlTYUBWWtCWOGc= someone@hostname
26
27 You must make sure that ~/.ssh, and the key file, are only writable by the
28 user.
29
30 NOTE: Dropbear ignores authorized_keys options such as those described in the
31 OpenSSH sshd manpage, and will not allow a login for these keys.
32
33 ============================================================================
34
35 Client public key auth:
36
37 Dropbear can do public key auth as a client, but you will have to convert
38 OpenSSH style keys to Dropbear format, or use dropbearkey to create them.
39
40 If you have an OpenSSH-style private key ~/.ssh/id_rsa, you need to do:
41
42 dropbearconvert openssh dropbear ~/.ssh/id_rsa ~/.ssh/id_rsa.db
43 dbclient -i ~/.ssh/id_rsa.db <hostname>
44
45 Currently encrypted keys aren't supported, neither is agent forwarding. At some
46 stage both hopefully will be.
47
48 ============================================================================
49
50 If you want to get the public-key portion of a Dropbear private key, look at
51 dropbearkey's '-y' option.
52
53 ============================================================================
54
55 To run the server, you need to generate server keys, this is one-off:
56 ./dropbearkey -t rsa -f dropbear_rsa_host_key
57 ./dropbearkey -t dss -f dropbear_dss_host_key
58
59 or alternatively convert OpenSSH keys to Dropbear:
60 ./dropbearconvert openssh dropbear /etc/ssh/ssh_host_dsa_key dropbear_dss_host_key
61
62 ============================================================================
63
64 If the server is run as non-root, you most likely won't be able to allocate a
65 pty, and you cannot login as any user other than that running the daemon
66 (obviously). Shadow passwords will also be unusable as non-root.
67
68 ============================================================================
69
70 The Dropbear distribution includes a standalone version of OpenSSH's scp
71 program. You can compile it with "make scp", you may want to change the path
72 of the ssh binary, specified by _PATH_SSH_PROGRAM in options.h . By default
73 the progress meter isn't compiled in to save space, you can enable it by
74 adding 'SCPPROGRESS=1' to the make commandline.