Mercurial > dropbear
annotate README @ 1857:6022df862942
Use DSCP for IP QoS traffic classes
The previous TOS values are deprecated and not used by modern traffic
classifiers. This sets AF21 for "interactive" traffic (with a tty).
Non-tty traffic sets AF11 - that indicates high throughput but is not
lowest priority (which would be CS1 or LE).
This differs from the CS1 used by OpenSSH, it lets interactive git over SSH
have higher priority than background least effort traffic. Dropbear's settings
here should be suitable with the diffservs used by CAKE qdisc.
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Tue, 25 Jan 2022 17:32:20 +0800 |
| parents | d32bcb5c557d |
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| rev | line source |
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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 |
| 1548 | 11 Please contact me if you have any questions/bugs found/features/ideas/comments etc :) |
| 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] |
| 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 | |
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54 To run the server, you need to generate 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 |
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58 ./dropbearkey -t ed25519 -f dropbear_ed25519_host_key |
| 72 | 59 |
| 60 or alternatively convert OpenSSH keys to Dropbear: | |
| 61 ./dropbearconvert openssh dropbear /etc/ssh/ssh_host_dsa_key dropbear_dss_host_key | |
| 62 | |
| 874 | 63 You can also get Dropbear to create keys when the first connection is made - |
| 64 this is preferable to generating keys when the system boots. Make sure | |
| 65 /etc/dropbear/ exists and then pass '-R' to the dropbear server. | |
| 66 | |
| 75 | 67 ============================================================================ |
| 72 | 68 |
| 69 If the server is run as non-root, you most likely won't be able to allocate a | |
| 70 pty, and you cannot login as any user other than that running the daemon | |
| 71 (obviously). Shadow passwords will also be unusable as non-root. | |
| 72 | |
| 75 | 73 ============================================================================ |
| 74 | |
| 72 | 75 The Dropbear distribution includes a standalone version of OpenSSH's scp |
| 76 program. You can compile it with "make scp", you may want to change the path | |
| 161 | 77 of the ssh binary, specified by _PATH_SSH_PROGRAM in options.h . By default |
| 75 | 78 the progress meter isn't compiled in to save space, you can enable it by |
| 79 adding 'SCPPROGRESS=1' to the make commandline. |