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1 | How to verify host keys using OpenSSH and DNS | ||
2 | --------------------------------------------- | ||
3 | |||
4 | OpenSSH contains experimental support for verifying host keys using DNS | ||
5 | as described in draft-ietf-secsh-dns-xx.txt. The document contains | ||
6 | very brief instructions on how to test this feature. Configuring DNS | ||
7 | and DNSSEC is out of the scope of this document. | ||
8 | |||
9 | |||
10 | (1) Enable DNS fingerprint support in OpenSSH | ||
11 | |||
12 | configure --with-dns | ||
13 | |||
14 | (2) Generate and publish the DNS RR | ||
15 | |||
16 | To create a DNS resource record (RR) containing a fingerprint of the | ||
17 | public host key, use the following command: | ||
18 | |||
19 | ssh-keygen -r hostname -f keyfile -g | ||
20 | |||
21 | where "hostname" is your fully qualified hostname and "keyfile" is the | ||
22 | file containing the public host key file. If you have multiple keys, | ||
23 | you should generate one RR for each key. | ||
24 | |||
25 | In the example above, ssh-keygen will print the fingerprint in a | ||
26 | generic DNS RR format parsable by most modern name server | ||
27 | implementations. If your nameserver has support for the SSHFP RR, as | ||
28 | defined by the draft, you can omit the -g flag and ssh-keygen will | ||
29 | print a standard RR. | ||
30 | |||
31 | To publish the fingerprint using the DNS you must add the generated RR | ||
32 | to your DNS zone file and sign your zone. | ||
33 | |||
34 | |||
35 | (3) Enable the ssh client to verify host keys using DNS | ||
36 | |||
37 | To enable the ssh client to verify host keys using DNS, you have to | ||
38 | add the following option to the ssh configuration file | ||
39 | ($HOME/.ssh/config or /etc/ssh/ssh_config): | ||
40 | |||
41 | VerifyHostKeyDNS yes | ||
42 | |||
43 | Upon connection the client will try to look up the fingerprint RR | ||
44 | using DNS. If the fingerprint received from the DNS server matches | ||
45 | the remote host key, the user will be notified. | ||
46 | |||
47 | |||
48 | Jakob Schlyter | ||
49 | Wesley Griffin | ||
50 | |||
51 | |||
52 | $OpenBSD: README.dns,v 1.1 2003/05/14 18:16:20 jakob Exp $ | ||