Access denied - SSH login

AdamF

After entering password:

debug2: we sent a password packet, wait for reply
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
Permission denied, please try again.

RamblingBiped

Have you tried stopping Fail2Ban? Anything strange showing up in your Fail2Ban logs?

RamblingBiped

This will show your Fail2Ban jails and display whether your IP blacklisted.

sudo iptables -L -n

AdamF

Nothing is blacklisted. In fact, in both Fail2Ban as well as the Responsive firewall in firewall, the IP I'm trying to connect from is whitelisted/in the trusted zone.

For good measure, I stopped Fail2Ban, and still receive the same messages.

RamblingBiped

<sarcasm>
Are you certain CAPS-LOCK isn't on?
</sarcasm>

RamblingBiped

Are you monitoring the /var/log/secure file as you are trying to connect? Have you tried connecting to the freepbx IP instead of hostname?

AdamF

Just tried, and it says Failed password for invalid user root from IP port xxxxx ssh2

RamblingBiped

"invalid user root"

What does your sshd_config file look like? Is root allowed? Have you restarted the ssh server since you made the last changes to the config file?

AdamF

@RamblingBiped said in Access denied - SSH login:

"invalid user root"

What does your sshd_config file look like? Is root allowed? Have you restarted the ssh server since you made the last changes to the config file?

Yes, service is restarted. The only changes to the stock sshd_config flle is:

PermitRootLogin yes
AllowGroups wheel
Port xxxx
AddressFamily inet

Alex Sage

Firewall?

scottalanmiller

Test the login from the box itself using the loopback 127.0.0.1

AdamF

@scottalanmiller said in Access denied - SSH login:

Test the login from the box itself using the loopback 127.0.0.1

No go. Permission denied, using the same password that I just logged in with.

scottalanmiller

@fuznutz04 said in Access denied - SSH login:

@scottalanmiller said in Access denied - SSH login:

Test the login from the box itself using the loopback 127.0.0.1

No go. Permission denied, using the same password that I just logged in with.

Okay, so you can rule out networking, both firewalls, etc. It's all down to SSH configuration at this point.

AdamF

@scottalanmiller said in Access denied - SSH login:

@fuznutz04 said in Access denied - SSH login:

@scottalanmiller said in Access denied - SSH login:

Test the login from the box itself using the loopback 127.0.0.1

No go. Permission denied, using the same password that I just logged in with.

Okay, so you can rule out networking, both firewalls, etc. It's all down to SSH configuration at this point.

Thanks for the tip. That definitely narrowed it down. So after playing with the config file for a while, I concluded that the problem is the line:

AllowGroups wheel

If I comment that out, it works perfect. if it's uncommented, it doesn't allow access, even to root.

(looks up and to the right while squinting eyes, confused...)

scottalanmiller

Yeah, that is a bit odd.

travisdh1

@fuznutz04 If you comment out 'PermitRootLogin yes' and leave 'AllowGroups wheel' in, are you able to login as a member of the wheel group? Thinking it might not like overlapping root and wheel, maybe.

I'm with @scottalanmiller, it doesn't make sense either way.

stacksofplates

I think allow group will only allow members from that group and since root isn't part of wheel it can't log in.

stacksofplates

If you add

AllowUsers root

it should also let root along with the wheel group.

AdamF

@travisdh1 Didn't like that either. It also doesn't work if I remove AllowGroups and try it with AllowUsers. It's almost like any line I add into that config borks the entire thing.

scottalanmiller

Very odd, indeed. Sorry I don't have any magic insight there.