#2097 closed enhancement (worksforme)
SSHFP with paramiko
Reported by: | elenril | Owned by: | elenril |
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Priority: | minor | Milestone: | 2.5 |
Component: | client | Version: | 2.4.x |
Keywords: | Cc: |
Description
One feature that I've been using with openssh, but is missing from the new paramiko code, is checking SSHFP DNS records.
Some background: SSHFP records are used to publish a host key fingerprints in DNS, then (assuming the domain is DNSSEC-secured and the client has a validating resolver) the client can verify the host keys through DNS rather than the classic trust-on-first-use method. In openssh, this is enabled by the VerifyHostKeyDNS yes
option in ssh_config
. Since I have many hosts which connect to each other, I think this scales better than the classic known_hosts
approach.
Now, paramiko does not support SSHFP natively, but it can be implemented by the caller through a custom missing host key policy. I'm attaching code for this policy I use in another codebase, though I am not sure whether it belongs in xpra or should be added to paramiko itself, or implemented in some other manner. Thoughts?
Attachments (1)
Change History (7)
Changed 2 years ago by
Attachment: | _sshfp_policy.py added |
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comment:1 Changed 2 years ago by
Status: | new → assigned |
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comment:2 Changed 2 years ago by
Owner: | changed from Antoine Martin to elenril |
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Status: | assigned → new |
Try r21287 and let me know how it goes.
I take back what I had said regarding merging this upstream: it's easier to have it separate so that the messages we get from the SSHFP DNS check can be integrated into the other dialogs / console messages.
comment:3 Changed 2 years ago by
Resolution: | → worksforme |
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Status: | new → closed |
Not heard back, closing - works for me.
comment:6 Changed 6 weeks ago by
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2097
I think the policy itself could be merged by paramiko, if they decide to do so. If anything, their review of the code would be useful to have.
The actual code changes in xpra would be minimal.
I'll try to take a look when I get a chance, but feel free to beat me to it.