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    Fedora 33 SSH Access Denied But Webmin Works Fine

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    • 1
      1337
      last edited by 1337

      You were too quick.
      It's the /etc/ssh/sshd_config file you want to look at.

      I wrote the wrong filename but corrected it straight away.

      The one you've been looking at is for the ssh client.

      NashBrydgesN 1 Reply Last reply Reply Quote 0
      • NashBrydgesN
        NashBrydges @1337
        last edited by

        @Pete-S Ah, I see that line is commented out. I suppose I need to change that to "yes" and uncomment?

        Here is the full content...

        cat /etc/ssh/ssh_config
#	$OpenBSD: ssh_config,v 1.35 2020/07/17 03:43:42 dtucker Exp $

# This is the ssh client system-wide configuration file.  See
# ssh_config(5) for more information.  This file provides defaults for
# users, and the values can be changed in per-user configuration files
# or on the command line.

# Configuration data is parsed as follows:
#  1. command line options
#  2. user-specific file
#  3. system-wide file
# Any configuration value is only changed the first time it is set.
# Thus, host-specific definitions should be at the beginning of the
# configuration file, and defaults at the end.

# Site-wide defaults for some commonly used options.  For a comprehensive
# list of available options, their meanings and defaults, please see the
# ssh_config(5) man page.

# Host *
#   ForwardAgent no
#   ForwardX11 no
#   PasswordAuthentication yes
#   HostbasedAuthentication no
#   GSSAPIAuthentication no
#   GSSAPIDelegateCredentials no
#   GSSAPIKeyExchange no
#   GSSAPITrustDNS no
#   BatchMode no
#   CheckHostIP yes
#   AddressFamily any
#   ConnectTimeout 0
#   StrictHostKeyChecking ask
#   IdentityFile ~/.ssh/id_rsa
#   IdentityFile ~/.ssh/id_dsa
#   IdentityFile ~/.ssh/id_ecdsa
#   IdentityFile ~/.ssh/id_ed25519
#   Port 22
#   Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc
#   MACs hmac-md5,hmac-sha1,[email protected]
#   EscapeChar ~
#   Tunnel no
#   TunnelDevice any:any
#   PermitLocalCommand no
#   VisualHostKey no
#   ProxyCommand ssh -q -W %h:%p gateway.example.com
#   RekeyLimit 1G 1h
#   UserKnownHostsFile ~/.ssh/known_hosts.d/%k
#
# This system is following system-wide crypto policy.
# To modify the crypto properties (Ciphers, MACs, ...), create a  *.conf
#  file under  /etc/ssh/ssh_config.d/  which will be automatically
# included below. For more information, see manual page for
#  update-crypto-policies(8)  and  ssh_config(5).
Include /etc/ssh/ssh_config.d/*.conf
> cat /etc/ssh/sshd_config
#	$OpenBSD: sshd_config,v 1.103 2018/04/09 20:41:22 tj Exp $

# This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information.

# This sshd was compiled with PATH=/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin

# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented.  Uncommented options override the
# default value.

# To modify the system-wide sshd configuration, create a  *.conf  file under
#  /etc/ssh/sshd_config.d/  which will be automatically included below
Include /etc/ssh/sshd_config.d/*.conf

# If you want to change the port on a SELinux system, you have to tell
# SELinux about this change.
# semanage port -a -t ssh_port_t -p tcp #PORTNUMBER
#
#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::

#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
#HostKey /etc/ssh/ssh_host_ed25519_key

# Ciphers and keying
#RekeyLimit default none

# Logging
#SyslogFacility AUTH
#LogLevel INFO

# Authentication:

#LoginGraceTime 2m
#PermitRootLogin prohibit-password
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

#PubkeyAuthentication yes

# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile	.ssh/authorized_keys

#AuthorizedPrincipalsFile none

#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody

# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes

# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
#PermitEmptyPasswords no

# Change to no to disable s/key passwords
#ChallengeResponseAuthentication yes

# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no
#KerberosUseKuserok yes

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
#GSSAPIStrictAcceptorCheck yes
#GSSAPIKeyExchange no
#GSSAPIEnablek5users no

# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication.  Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
# WARNING: 'UsePAM no' is not supported in Fedora and may cause several
# problems.
#UsePAM no

#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
#X11Forwarding no
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
#PrintMotd yes
#PrintLastLog yes
#TCPKeepAlive yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS no
#PidFile /var/run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none

# no default banner path
#Banner none

# override default of no subsystems
Subsystem	sftp	/usr/libexec/openssh/sftp-server

# Example of overriding settings on a per-user basis
#Match User anoncvs
#	X11Forwarding no
#	AllowTcpForwarding no
#	PermitTTY no
#	ForceCommand cvs server
        NashBrydgesN 1 Reply Last reply Reply Quote 0
        • NashBrydgesN
          NashBrydges @NashBrydges
          last edited by

          @NashBrydges Yep, changed it to yes and now I can access via SSH!!! Thank you for the help!

          1 scottalanmillerS 2 Replies Last reply Reply Quote 1
          • 1
            1337 @NashBrydges
            last edited by

            @NashBrydges said in Fedora 33 SSH Access Denied But Webmin Works Fine:

            @NashBrydges Yep, changed it to yes and now I can access via SSH!!! Thank you for the help!

            Good man! You got the job done!

            If the ssh server is accessible from the internet make sure the root password is long enough and random. At least 16 characters preferably.

            NashBrydgesN 1 Reply Last reply Reply Quote 0
            • NashBrydgesN
              NashBrydges @1337
              last edited by

              @Pete-S No external access so they are golden. Password has been changed to a 20 character one as well.

              JaredBuschJ scottalanmillerS 2 Replies Last reply Reply Quote 1
              • JaredBuschJ
                JaredBusch @NashBrydges
                last edited by

                @NashBrydges said in Fedora 33 SSH Access Denied But Webmin Works Fine:

                @Pete-S No external access so they are golden. Password has been changed to a 20 character one as well.

                Make a new user for this and disable root in ssh again anyway.

                1 Reply Last reply Reply Quote 2
                • scottalanmillerS
                  scottalanmiller @NashBrydges
                  last edited by

                  @NashBrydges said in Fedora 33 SSH Access Denied But Webmin Works Fine:

                  The previous IT guy set it up on Fedora and added Webmin. I was told that there was no new password selected for Webmin and that it would login as root so he gave me the access password and in fact I can login to Webmin using root + password however, when I try to login through SSH using the same credentials, I get an Access Denied error.

                  Root is disabled by default in SSH configs most of the time.

                  JaredBuschJ 1 Reply Last reply Reply Quote 0
                  • scottalanmillerS
                    scottalanmiller @NashBrydges
                    last edited by

                    @NashBrydges said in Fedora 33 SSH Access Denied But Webmin Works Fine:

                    I ran sudo pwck -r /etc/shadow and I get this output related to root user.

                    sudo pwck -r /etc/shadow
                    invalid password file entry
                    delete line 'root:$6$wMHG.3SSWjCcHHKO$9UmPtJcSyKaA/EKLWX6vhx02eaJH7yfdsDA9PRCadROMMb6Sgjggdq7V0/gNXB3q19LZK.sYshPiEyv3XYv8D.::0:99999:7:::'? No

                    root isn't impacted by sudo

                    1 Reply Last reply Reply Quote 0
                    • scottalanmillerS
                      scottalanmiller @NashBrydges
                      last edited by

                      @NashBrydges said in Fedora 33 SSH Access Denied But Webmin Works Fine:

                      @Dashrender I thought that too but when I enumerate users...

                      cat /etc/passwd

                      I get this for root...

                      root:x:0:0:root:/root:/bin/bash

                      Unless I am reading this wrong, it doesn't look like that was the case. There are also no other users listed in the output besides the apache, mysql, systemd...etc.

                      It's the SSH config, not the password that is the issue. You know the /etc/passwd file is working great since WebMin is using it and verifying that for you. So you know the issue is limited to SSH.

                      1 Reply Last reply Reply Quote 0
                      • scottalanmillerS
                        scottalanmiller @NashBrydges
                        last edited by

                        @NashBrydges said in Fedora 33 SSH Access Denied But Webmin Works Fine:

                        @NashBrydges Yep, changed it to yes and now I can access via SSH!!! Thank you for the help!

                        This is expected behaviour. The former IT just didn't change it. They might have installed WebMin because they didn't know how to do this. WebMin is a pretty weird thing for an IT shop that knows Linux to install. So my guess is that they were so lost that they attempted a workaround.

                        1 Reply Last reply Reply Quote 1
                        • scottalanmillerS
                          scottalanmiller @NashBrydges
                          last edited by

                          @NashBrydges said in Fedora 33 SSH Access Denied But Webmin Works Fine:

                          @Pete-S No external access so they are golden. Password has been changed to a 20 character one as well.

                          Switch to a key 😉

                          1 Reply Last reply Reply Quote 0
                          • JaredBuschJ
                            JaredBusch @scottalanmiller
                            last edited by

                            @scottalanmiller said in Fedora 33 SSH Access Denied But Webmin Works Fine:

                            Root is disabled by default in SSH configs most of the time.

                            Not until the last couple years. Sure we always disabled it, but it was not default that way until recently.

                            1 1 Reply Last reply Reply Quote 1
                            • 1
                              1337 @JaredBusch
                              last edited by 1337

                              @JaredBusch said in Fedora 33 SSH Access Denied But Webmin Works Fine:

                              @scottalanmiller said in Fedora 33 SSH Access Denied But Webmin Works Fine:

                              Root is disabled by default in SSH configs most of the time.

                              Not until the last couple years. Sure we always disabled it, but it was not default that way until recently.

                              Ubuntu disabled it by default in 14.04 (2014) and Debian in version 8 (2015).

                              This probably coincide when openssh developers decided that disabled should be the default in the source code.

                              It's up to the distro to set defaults for installed packages so RedHat based distros like Fedora might have been much later.

                              1 Reply Last reply Reply Quote 0
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