Can someone explain how sshd does privilege separation?
sshd 10072 0.2 0.0 71272 3016 ? S 10:56 0:00 \_ sshd: unknown [net] There you see the privileged process running under root privileges (10071) and net-child (sshd: user [net], running under sshd …
OpenSSH Disabling Diffie-Hellman (DHE) key exchange
Aug 12, 2022 · I'm seeking to mitigate CVE-2002-20001 by disabling DHE key exchange through OpenSSH on an Ubuntu instance. I understand this can be achieved through editing the …
QID 38909 SHA1 deprecated setting for SSH (RHEL 8.6)
Dec 23, 2024 · The ssh -Q key command lists the key types that are supported by the SSH client. The output from the /usr/bin/sshd -tT command you posted lists the ciphers that are enabled on the SSH …
openssh - What are these: "sshd-session: banner exchange ... invalid ...
Jul 7, 2025 · sshd-session[PID]: banner exchange: Connection from ip.add.res.s port PORT: invalid format The IP-addresses are from all over the world, so, obviously, these aren't legitimate …
Secure Configuration of Ciphers/MACs/Kex available in SSH
Note that this question is not about 0-days or other related flaws in the SSH code and is specifically about the best possible arrangement and configuration of the ciphers, KexAlgorithms, and MACs. If …
RHEL in FIPS mode ignores crypto subpolicy
Sep 26, 2024 · It appears that in FIPS mode, by default, sshd uses hardcoded values for the ciphers, instead of using the values from the crypto policy. In RHEL 9, the back-end file generated by crypto …
OpenSSH AuthorizedPrincipalsFile Allows Any User
Aug 12, 2021 · This is intended behavior. Basically if you specify a static, unparameterized AuthorizedPrincipalFiles, then the same file is used for all users. If you want user-based control, you …
OpenSSH default/preferred ciphers, hash, etc for SSH2
25 When using OpenSSH server (sshd) and client (ssh), what are all of the default / program preferred ciphers, hash, etc. (security related) and their default options (such as key length)? So, what are the …
rsa - Is allowing root login in SSH with "PermitRootLogin without ...
Nov 29, 2017 · I have set my live IP in /etc/hosts.allow, and deny all other hosts. I have also set PermitRootLogin without-password in /etc/ssh/sshd_config. Is that a secure method? Can an …
Understanding ssh-rsa not in PubkeyAcceptedAlgorithms
May 21, 2023 · The name ssh-rsa has two different meanings here. There's the key type ssh-rsa which you can see in the first column of your authorized_keys file. RSA keys are perfectly fine and widely …