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sshd_config: Do not set defaults explicitly

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In order to keep configurations as small as possible and to make them
easier to read/audit, this patch omits all default configuration in the
OpenSSH server configuration file.

Further, it mentions where to refer for the full documentation.

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>
This commit is contained in:
Peter Müller
2020-01-20 20:04:00 +00:00
committed by Arne Fitzenreiter
parent 3fd3f4de44
commit 57302eeb16
1 changed files with 20 additions and 42 deletions
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62
config/ssh/sshd_config
View File

@@ -1,81 +1,59 @@
# ultra-secure OpenSSH server configuration
# OpenSSH server configuration file for IPFire
#
# The full documentation is available at: https://man.openbsd.org/sshd_config
#
# only allow version 2 of SSH protocol
# Only allow version 2 of SSH protocol
Protocol 2
# listen on port 22 by default
# Listen on port 22 by default
Port 22
# listen on these interfaces and protocols
AddressFamily any
# Listen on every interface and IPv4 only
AddressFamily inet
ListenAddress 0.0.0.0
# limit authentication thresholds
# Limit authentication timeout to 30 seconds
LoginGraceTime 30s
MaxAuthTries 6
# limit maximum instanctes to prevent DoS
# Limit maximum instanctes to prevent DoS
MaxStartups 5
# ensure proper logging
SyslogFacility AUTH
LogLevel INFO
# enforce permission checks before a login is accepted
# (prevents damage because of hacked systems with world-writeable
# home directories or similar)
StrictModes yes
# only allow safe crypto algorithms (may break some _very_ outdated clients)
# see also: https://stribika.github.io/2015/01/04/secure-secure-shell.html
# Only allow safe crypto algorithms (may break some _very_ outdated clients)
# See also: https://stribika.github.io/2015/01/04/secure-secure-shell.html
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,umac-128@openssh.com
# enable data compression after successful login only
Compression delayed
# only allow cryptographically safe SSH host keys (adjust paths if needed)
# Only allow cryptographically safe SSH host keys (adjust paths if needed)
HostKey /etc/ssh/ssh_host_ed25519_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_rsa_key
# only allow login via public key by default
# Only allow login via public key by default
PubkeyAuthentication yes
PasswordAuthentication no
ChallengeResponseAuthentication no
PermitEmptyPasswords no
# permit root login as there is no other user in IPFire 2.x
# Permit root login as there is no other user in IPFire 2.x
PermitRootLogin yes
# ignore user ~/.rhost* files
IgnoreRhosts yes
# ignore user known hosts file
# Ignore user ~/.ssh/known_hosts file
IgnoreUserKnownHosts yes
# ignore user environments
PermitUserEnvironment no
# do not allow any kind of forwarding (provides only low security)
# Do not allow any kind of forwarding (provides only low security);
# some of them might need to be re-enabled if SSH server is a jump platform
X11Forwarding no
AllowTcpForwarding no
AllowAgentForwarding no
PermitTunnel no
GatewayPorts no
PermitOpen none
# detect broken sessions by sending keep-alive messages to
# clients (both via TCP and SSH)
TCPKeepAlive yes
# Detect broken sessions by sending keep-alive messages to clients via SSH connection
ClientAliveInterval 10
# close unresponsive SSH sessions which fail to answer keep-alive
# Close unresponsive SSH sessions which fail to answer keep-alive
ClientAliveCountMax 6
# add support for SFTP
# Add support for SFTP
Subsystem sftp /usr/lib/openssh/sftp-server
# EOF