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Old 04-07-2020, 12:56 AM   #1
karthi1985
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Question SSH Key to be removed for XMSS in RHEL8


Guys,

Getting private key checking for ssh passwordless authentication using keys as below in RHEL8 while i am debugging ssh

I have executed ssh-add -d/D to remove the keys but not working
how to remove the XMSS private key checking in RHLE8. Please advise

Trying private key: /home/akarthi1/.ssh/id_xmss
debug1: Next authentication method: password
 
Old 04-07-2020, 02:55 AM   #2
berndbausch
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The KexAlgorithms setting in sshd_config or ssh_config might do what you want.
 
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Old 04-07-2020, 08:14 AM   #3
TB0ne
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Quote:
Originally Posted by karthi1985 View Post
Guys,
Getting private key checking for ssh passwordless authentication using keys as below in RHEL8 while i am debugging ssh

I have executed ssh-add -d/D to remove the keys but not working how to remove the XMSS private key checking in RHLE8. Please advise

Trying private key: /home/akarthi1/.ssh/id_xmss
debug1: Next authentication method: password
Have you contacted Red Hat support? You're using RHEL 8, so you're PAYING for it, right?? As such, you have access to their knowlegebase, along with support. And as berndbausch said, setting options in sshd_config is what you're after. Have you done any research on the options there, or looked (again) at the Red hat site on how to configure SSHD??

https://access.redhat.com/documentat...uring-networks
 
Old 04-09-2020, 02:45 AM   #4
karthi1985
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Hi berndbausch,

i tried searching the kex algorithm we need to remove for ID_xmss private key. but couldnt get one. Please advise me which kexalgorithm we have to remove for the removal of private key "id_xmss" in ssh.

Thanks
KArthi
 
Old 04-09-2020, 05:12 AM   #5
berndbausch
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Sorry but I don't know. I would remove them all, then add them one by one.
 
Old 04-09-2020, 07:47 AM   #6
TB0ne
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Quote:
Originally Posted by karthi1985 View Post
Hi berndbausch,
i tried searching the kex algorithm we need to remove for ID_xmss private key. but couldnt get one. Please advise me which kexalgorithm we have to remove for the removal of private key "id_xmss" in ssh.
Again: Have you contacted Red Hat support? You're using RHEL 8, so you're PAYING for it, right?? As such, you have access to their knowlegebase, along with support. And as berndbausch said, setting options in sshd_config is what you're after. Have you done any research on the options there, or looked (again) at the Red hat site on how to configure SSH?? If you're trying to address a CVE, it's already been done if you have the patch from RHEL:
https://bugzilla.redhat.com/show_bug...CVE-2019-16905

...which you should, since you're PAYING for RHEL, right?

And do you have any actual ERRORS?? What you've posted is a debug message, one of several that probably came up (and went past). Do you have an actual PROBLEM getting logged in?? You haven't told us what you're logging in from, either, using what terminal software.
 
  


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