mirror of
https://github.com/ovh/debian-cis.git
synced 2024-11-25 15:01:22 +01:00
131 lines
4.1 KiB
Bash
Executable File
131 lines
4.1 KiB
Bash
Executable File
#!/bin/bash
|
|
|
|
# run-shellcheck
|
|
#
|
|
# CIS Debian Hardening
|
|
#
|
|
|
|
#
|
|
# 5.2.18 Ensure SSH access is limited (Scored)
|
|
#
|
|
|
|
set -e # One error, it's over
|
|
set -u # One variable unset, it's over
|
|
|
|
# shellcheck disable=2034
|
|
HARDENING_LEVEL=3
|
|
# shellcheck disable=2034
|
|
DESCRIPTION="Limite access via SSH by (dis)allowing specific users or groups."
|
|
|
|
PACKAGE='openssh-server'
|
|
FILE='/etc/ssh/sshd_config'
|
|
|
|
# This function will be called if the script status is on enabled / audit mode
|
|
audit() {
|
|
OPTIONS="AllowUsers='$ALLOWED_USERS' AllowGroups='$ALLOWED_GROUPS' DenyUsers='$DENIED_USERS' DenyGroups='$DENIED_GROUPS'"
|
|
is_pkg_installed "$PACKAGE"
|
|
if [ "$FNRET" != 0 ]; then
|
|
ok "$PACKAGE is not installed!"
|
|
else
|
|
ok "$PACKAGE is installed"
|
|
for SSH_OPTION in $OPTIONS; do
|
|
SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
|
|
SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
|
|
# shellcheck disable=SC2001
|
|
SSH_VALUE=$(sed "s/'//g" <<<"$SSH_VALUE")
|
|
PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
|
|
does_pattern_exist_in_file_nocase "$FILE" "$PATTERN"
|
|
if [ "$FNRET" = 0 ]; then
|
|
ok "$PATTERN is present in $FILE"
|
|
else
|
|
crit "$PATTERN is not present in $FILE"
|
|
fi
|
|
done
|
|
fi
|
|
}
|
|
|
|
# This function will be called if the script status is on enabled mode
|
|
apply() {
|
|
is_pkg_installed "$PACKAGE"
|
|
if [ "$FNRET" = 0 ]; then
|
|
ok "$PACKAGE is installed"
|
|
else
|
|
crit "$PACKAGE is absent, installing it"
|
|
apt_install "$PACKAGE"
|
|
fi
|
|
for SSH_OPTION in $OPTIONS; do
|
|
SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
|
|
SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
|
|
# shellcheck disable=SC2001
|
|
SSH_VALUE=$(sed "s/'//g" <<<"$SSH_VALUE")
|
|
PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
|
|
does_pattern_exist_in_file_nocase "$FILE" "$PATTERN"
|
|
if [ "$FNRET" = 0 ]; then
|
|
ok "$PATTERN is present in $FILE"
|
|
else
|
|
warn "$PATTERN is not present in $FILE, adding it"
|
|
does_pattern_exist_in_file_nocase "$FILE" "^${SSH_PARAM}"
|
|
if [ "$FNRET" != 0 ]; then
|
|
add_end_of_file "$FILE" "$SSH_PARAM $SSH_VALUE"
|
|
else
|
|
info "Parameter $SSH_PARAM is present but with the wrong value -- Fixing"
|
|
replace_in_file "$FILE" "^${SSH_PARAM}[[:space:]]*.*" "$SSH_PARAM $SSH_VALUE"
|
|
fi
|
|
/etc/init.d/ssh reload
|
|
fi
|
|
done
|
|
}
|
|
|
|
# This function will create the config file for this check with default values
|
|
create_config() {
|
|
cat <<EOF
|
|
status=audit
|
|
# Put here ssh user hardening list, there is a default in script to not break your configuration
|
|
# However, it can erase current configuration
|
|
ALLOWED_USERS=''
|
|
ALLOWED_GROUPS=''
|
|
DENIED_USERS=''
|
|
DENIED_GROUPS=''
|
|
EOF
|
|
}
|
|
|
|
# This function will check config parameters required
|
|
check_config() {
|
|
if [ -z "$ALLOWED_USERS" ]; then
|
|
info "ALLOWED_USERS is not set, defaults to wildcard"
|
|
ALLOWED_USERS="*"
|
|
fi
|
|
if [ -z "$ALLOWED_GROUPS" ]; then
|
|
info "ALLOWED_GROUPS is not set, defaults to wildcard"
|
|
ALLOWED_GROUPS="*"
|
|
fi
|
|
if [ -z "$DENIED_USERS" ]; then
|
|
info "DENIED_USERS is not set, defaults to nobody"
|
|
DENIED_USERS="nobody"
|
|
fi
|
|
if [ -z "$DENIED_GROUPS" ]; then
|
|
info "DENIED_GROUPS is not set, defaults to nobody"
|
|
DENIED_GROUPS="nobody"
|
|
fi
|
|
}
|
|
|
|
# Source Root Dir Parameter
|
|
if [ -r /etc/default/cis-hardening ]; then
|
|
# shellcheck source=../../debian/default
|
|
. /etc/default/cis-hardening
|
|
fi
|
|
if [ -z "$CIS_ROOT_DIR" ]; then
|
|
echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
|
|
echo "Cannot source CIS_ROOT_DIR variable, aborting."
|
|
exit 128
|
|
fi
|
|
|
|
# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
|
|
if [ -r "$CIS_ROOT_DIR"/lib/main.sh ]; then
|
|
# shellcheck source=../../lib/main.sh
|
|
. "$CIS_ROOT_DIR"/lib/main.sh
|
|
else
|
|
echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
|
|
exit 128
|
|
fi
|