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https://bugzilla.mindrot.org/show_bug.cgi?id=3599

Bug ID: 3599
Summary: How to scan for keys when sshd server has fips
enabled?
Product: Portable OpenSSH
Version: 9.3p2
Hardware: All
OS: Linux
Status: NEW
Severity: critical
Priority: P5
Component: ssh-keyscan
Assignee: unassigned-bugs@mindrot.org
Reporter: sshedi@vmware.com

Created attachment 3712
--> https://bugzilla.mindrot.org/attachment.cgi?id=3712&action=edit
Server's sshd config

Hi,

I have an sshd server which is fips enabled and client is non fips.

How to get the server public keys using ssh-keyscan in this case?

I tried running keyscan in the server itself and even that is failing.

```
root@ph5dev:~ # ssh-keyscan localhost
# localhost:22 SSH-2.0-OpenSSH_9.3
# localhost:22 SSH-2.0-OpenSSH_9.3
# localhost:22 SSH-2.0-OpenSSH_9.3
# localhost:22 SSH-2.0-OpenSSH_9.3
# localhost:22 SSH-2.0-OpenSSH_9.3
```

This also returns nothing.

The work around for this issue is, adding below line (or some other
fips complaint cipher) to /etc/ssh/sshd_config

```
Ciphers aes128-ctr
```

AFAIK, nothing can be done from client side to make it work. Please let
me know if there is anyway to get it working.

Proposed solutions:

- ssh-keyscan should use configs from /etc/ssh/ssh_config or
$HOME/.ssh/config like ssh does

- ssh-keyscan should accept "-c <cipher>" arg to do negotiation with
server.

- A conf file of its own for ssh-keyscan.

Ultimately, ssh-keyscan should work without any modifications in server
and little or no change at client side.

PFA for my server config.

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