SSH

SSH LogLevels

logging, SSH
Log Levels for SSH In SSH, the LogLevel option allows you to control the level of logging information generated by the SSH client and server. There are several log levels you can use to adjust the verbosity of SSH logging. Here are the most commonly used log levels: QUIET: Suppresses all log messages, except for fatal errors. It provides the least amount of information. FATAL: Logs only fatal errors, indicating severe issues that may prevent the SSH session from being established.

IP over SSH

SSH, tunnel, OpenBSD
wanna tunnel IP over SSH ? give a try ? Tested for you with … OpenBSD :) Host1 do the following as root echo "net.inet.ip.forwarding=1" >> /etc/sysctl.conf sysctl net.inet.ip.forwarding=1 echo "inet 10.0.0.1 255.255.255.0 10.0.0.2" >> /etc/hostname.tun0 sh /etc/netstart tun0 sed -i '/PermitTunnel .*/PermitTunnel yes/' /etc/ssh/sshd_config rcctl restart sshd ssh-copy-id root@host2 Host2 do the following as root echo "net.inet.ip.forwarding=1" >> /etc/sysctl.conf sysctl net.inet.ip.forwarding=1 echo "inet 10.0.0.2 255.255.255.0 10.0.0.1" >> /etc/hostname.tun0 sh /etc/netstart tun0 sed -i '/PermitTunnel .

Slides - SSH Agent

slides, SSH, ssh agent
made a few Slides about SSH Agent & Agent Forwarding with https://slides.com. Do you like it ? I do … Any Comments ? sha256: dd15fd6475246beedee7f6c61924134c76248cf5e28d7092283475c97e9f2f50

SSH Key Generator

SSH, Security
If you need multiple SSH keys with passphrases for educational purposes, you can generate them as follows. The passphrase is set in the comments of the corresponding public key. SSH Key Generator Script cat << 'EOF' > /tmp/ssh-key-generator.sh #!/usr/bin/env bash # File f=/tmp/id_ed25519 # Cleanup test -f $f && rm $f $f.pub # Gen Key ssh-keygen -o -a 100 -t ed25519 -N "" -f ${f} # Extact Password (last 8 Char from PubKey) pw=$(cat ${f}.

Yubikey - on OpenBSD

MFA, OpenBSD, Security, SSH, Yubikey
Running YubiKey on OpenBSD buy a Key and give try … Source https://www.yubico.com/ Install Software pkg_add yubikey-manager-3.1.2p4 pkg_add yubikey-manager-3.1.2p4 quirks-6.42 signed on 2023-01-08T01:39:04Z yubikey-manager-3.1.2p4:py3-click-7.1.2: ok yubikey-manager-3.1.2p4:py3-pyusb-1.0.2p5: ok yubikey-manager-3.1.2p4:pcsc-lite-1.9.8: ok yubikey-manager-3.1.2p4:py3-cparser-2.19p2: ok yubikey-manager-3.1.2p4:py3-cffi-1.15.1: ok yubikey-manager-3.1.2p4:py3-cryptography-38.0.0p0: ok yubikey-manager-3.1.2p4:py3-pyscard-2.0.3: ok yubikey-manager-3.1.2p4:py3-openssl-22.0.0: ok yubikey-manager-3.1.2p4:libyubikey-1.13p4: ok yubikey-manager-3.1.2p4:json-c-0.16: ok yubikey-manager-3.1.2p4:ykpers-1.20.0p2: ok yubikey-manager-3.1.2p4: ok The following new rcscripts were installed: /etc/rc.d/pcscd See rcctl(8) for details. --- +yubikey-manager-3.1.2p4 ------------------- NOTE: yubikey-manager (ykman) is only partially functional on OpenBSD. Most of the "ykman fido xxx" commands (pin-setting and others) stall.

SSH - Cipher, Key, MAC

SSH
SSH Stuff Supported Ciphers, Key, MAC on OpenBSD 7.1. Not all of them are good for useage, here is my recommendation. Recommended for your sshd_config / ssh_config Ciphers aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes128-cbc HostKeyAlgorithms ssh-ed25519,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com, sk-ssh-ed25519@openssh.com,rsa-sha2-512,rsa-sha2-256 Kexalgorithms curve25519-sha256@libssh.org,diffie-hellman-group16-sha512, diffie-hellman-group18-sha512,diffie-hellman-group14-sha256 MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com PubKeyAcceptedKeyTypes ssh-ed25519,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com, rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com, ssh-rsa-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,rsa-sha2-512,rsa-sha2-25 List of all available Types Cipher ssh -Q cipher 3des-cbc aes128-cbc aes192-cbc aes256-cbc aes128-ctr aes192-ctr aes256-ctr aes128-gcm@openssh.com aes256-gcm@openssh.com chacha20-poly1305@openssh.com HostbasedAcceptedAlgorithms ssh -Q HostbasedAcceptedAlgorithms ssh-ed25519 ssh-ed25519-cert-v01@openssh.com sk-ssh-ed25519@openssh.com sk-ssh-ed25519-cert-v01@openssh.com ssh-rsa rsa-sha2-256 rsa-sha2-512 ssh-dss ecdsa-sha2-nistp256 ecdsa-sha2-nistp384 ecdsa-sha2-nistp521 sk-ecdsa-sha2-nistp256@openssh.

OpenSSH 2FA Google Auth

Alpine, Linux, Security, SSH
Let’s give a try with Alpine Linux, OpenSSH and 2FA with Google Authenticator. add Packages apk add openssh openssh-server-pam google-authenticator openssh-doc google-authenticator-doc libqrencode Configure GoogleAuth touch /etc/pam.d/sshd ln /etc/pam.d/sshd /etc/pam.d/sshd.pam cat << 'EOF' >> /etc/pam.d/sshd.pam account include base-account auth required pam_env.so auth required pam_nologin.so successok auth required /lib/security/pam_google_authenticator.so echo_verification_code grace_period=57600 nullok auth required pam_unix.so md5 sha512 EOF update sshd_config cat << 'EOF' >> /etc/ssh/sshd_config PasswordAuthentication no AuthenticationMethods any UsePAM yes EOF Restart SSHD service sshd restart Setup User su - USERNAME google-authenticator Response

AGE - Encrypt Files with SSH Keys

OpenBSD, Security, SSH
Stumbled upon something that I’ve missed for a long time: encrypting files with the ssh public key :) Source https://github.com/FiloSottile/age Install Package OpenBSD (and most others *nix systems) got a package for age. Just install it. doas pkg_add age Asymmetric Encryption Asymmetric Encryption encrypts and decrypts the data using two separate yet mathematically connected cryptographic keys. These keys are known as a ‘Public Key’ and a ‘Private Key’. Together, they’re called a ‘Public and Private Key Pair’

SSH - Signing Files

SSH, System
Signing Files with SSH 8.0 unsigned file $ cat hosts 127.0.0.1 localhost ::1 localhost 1.2.3.4 egal sign $ ssh-keygen -Y sign -f id_rsa -n file hosts Signing file hosts Write signature to hosts.sig signed file $ cat hosts.sig -----BEGIN SSH SIGNATURE----- U1NIU0lHAAAAAQAAAZcAAAAHc3NoLXJzYQAAAAMBAAEAAAGBALJB+O4WCOM7V56H1xigpd uJem52Izwltl2cG9GQOO94HClebcr7C5aD24iI4wDcT9Ajv5/fu9cDVEXku83I/U0blUZe oMd8qCIH+4O+RVYyCvKFyEkcZ6n+RRH1G5EgcP0UXtmo4J3p8Hyo/6jtPA/r28+idi84A6 7yW1cmC5GpIw24Vr5aqA3e3rCJdFBZThzsTrwu/DHzIueQstEQdldycUit4X9UPBaCVnov +nhyijO9b8adzkTMxjcJAl65fdLUmwuJ5h3z0owdKOmrcNlbWxqTIuGU0in25ZDQVxLssc WI8oW7vR5F7+cXSV7fYliTG/XPsCkD1KpWc/xSOr35bALRQpxD1+T48mrbKToZuzu4hage cUSOvRI3R0hKIvcXYyf2SQoBfLNlpvl5CRcatlw2fMhFQPrVz0Bh543chEFsF4nxKQw8yq riJbqkvhW8tzKCnMA7vyTRxey6uSDJrw0YchXIJdprNUlgM1t+z9J3AwC4ugpvhgVd6H0v 9QAAAAxob3N0cy5zaWduZWQAAAAAAAAABnNoYTUxMgAAAZQAAAAMcnNhLXNoYTItNTEyAA ABgAB9zAZStPsSvPIBh66lAgGLE/JWPk0voZjTUz9pO5wl81aM6Kn1clY9n4jysEkiQ0xy yy/tWgFzKi10mVfh/SJ34L2Mdo8t+vBnha1KNlkFwXZl+GXiCLlVl+ei6xpRfp9knheoIh LyEHoxgkuI6lO0c8pi4ymNnrlfvkg9SvvZfSdXWUMfTWHDlHvFIGqMg3BWQu7ylTEgQVDF obpqDInU3hkisfsywQRQh6KVVe8eSUc0qVH/FSSLoG8X/IX9Vh3g4tT/2FJPrE4k464yie GdnLkp5edcnnE+jjoSQroMs52QWy2a3XXZC5KTaDL6w4mcry1RpavhXb5aJQ7o0852Pkc9 wDkwX/11JZhMmxNZbDlg+tHsWy12KUubKAxAjJ1HUFXMjTFI6HMu8WyU989e3dOTt/bL3W l7sDo5P8SGv3/6+tJxugz9shz8WaN9Xz6Oh2AfCM6+IROXaeUgWMXtDmGS5bUZxUOSxHa1 ww7wzYR0NKXuOk3IeJMSQ2f97g== -----END SSH SIGNATURE----- verify file allowed signers $ cat /etc/allowed_signers mail@world.net ssh-rsa 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 verify