Mercurial > dropbear
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| author | Matt Johnston <matt@ucc.asn.au> |
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| date | Tue, 15 Mar 2016 22:40:15 +0800 |
| parents | 8bc704f417f3 |
| children | 10dd3df31d5b |
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1 This is Dropbear, a smallish SSH server and client. |
| 701 | 2 https://matt.ucc.asn.au/dropbear/dropbear.html |
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3 |
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4 INSTALL has compilation instructions. |
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5 |
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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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10 |
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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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13 |
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14 Matt Johnston |
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15 [email protected] |
| 380 | 16 |
| 17 | |
| 75 | 18 In the absence of detailed documentation, some notes follow: |
| 72 | 19 ============================================================================ |
| 20 | |
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21 Server public key auth: |
| 72 | 22 |
| 23 You can use ~/.ssh/authorized_keys in the same way as with OpenSSH, just put | |
| 24 the key entries in that file. They should be of the form: | |
| 25 | |
| 26 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAwVa6M6cGVmUcLl2cFzkxEoJd06Ub4bVDsYrWvXhvUV+ZAM9uGuewZBDoAqNKJxoIn0Hyd0Nk/yU99UVv6NWV/5YSHtnf35LKds56j7cuzoQpFIdjNwdxAN0PCET/MG8qyskG/2IE2DPNIaJ3Wy+Ws4IZEgdJgPlTYUBWWtCWOGc= someone@hostname | |
| 27 | |
| 28 You must make sure that ~/.ssh, and the key file, are only writable by the | |
| 290 | 29 user. Beware of editors that split the key into multiple lines. |
| 72 | 30 |
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31 Dropbear supports some options for authorized_keys entries, see the manpage. |
| 72 | 32 |
| 75 | 33 ============================================================================ |
| 34 | |
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35 Client public key auth: |
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36 |
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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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39 |
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40 If you have an OpenSSH-style private key ~/.ssh/id_rsa, you need to do: |
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41 |
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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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44 |
| 874 | 45 Dropbear does not support encrypted hostkeys though can connect to ssh-agent. |
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46 |
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47 ============================================================================ |
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48 |
| 75 | 49 If you want to get the public-key portion of a Dropbear private key, look at |
| 50 dropbearkey's '-y' option. | |
| 51 | |
| 52 ============================================================================ | |
| 53 | |
| 874 | 54 To run the server, you need to server keys, this is one-off: |
| 72 | 55 ./dropbearkey -t rsa -f dropbear_rsa_host_key |
| 56 ./dropbearkey -t dss -f dropbear_dss_host_key | |
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57 ./dropbearkey -t ecdsa -f dropbear_ecdsa_host_key |
| 72 | 58 |
| 59 or alternatively convert OpenSSH keys to Dropbear: | |
| 60 ./dropbearconvert openssh dropbear /etc/ssh/ssh_host_dsa_key dropbear_dss_host_key | |
| 61 | |
| 874 | 62 You can also get Dropbear to create keys when the first connection is made - |
| 63 this is preferable to generating keys when the system boots. Make sure | |
| 64 /etc/dropbear/ exists and then pass '-R' to the dropbear server. | |
| 65 | |
| 75 | 66 ============================================================================ |
| 72 | 67 |
| 68 If the server is run as non-root, you most likely won't be able to allocate a | |
| 69 pty, and you cannot login as any user other than that running the daemon | |
| 70 (obviously). Shadow passwords will also be unusable as non-root. | |
| 71 | |
| 75 | 72 ============================================================================ |
| 73 | |
| 72 | 74 The Dropbear distribution includes a standalone version of OpenSSH's scp |
| 75 program. You can compile it with "make scp", you may want to change the path | |
| 161 | 76 of the ssh binary, specified by _PATH_SSH_PROGRAM in options.h . By default |
| 75 | 77 the progress meter isn't compiled in to save space, you can enable it by |
| 78 adding 'SCPPROGRESS=1' to the make commandline. |