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https://github.com/ovh/debian-cis.git
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124 lines
3.9 KiB
Bash
Executable File
124 lines
3.9 KiB
Bash
Executable File
#!/bin/bash
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# run-shellcheck
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#
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# CIS Debian Hardening
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#
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#
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# 5.2.23 Ensure SSH MaxSessions is limited (Scored)
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#
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set -e # One error, it's over
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set -u # One variable unset, it's over
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# shellcheck disable=2034
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HARDENING_LEVEL=3
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# shellcheck disable=2034
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DESCRIPTION="Limit SSH MaxSessions."
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PACKAGE='openssh-server'
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OPTIONS=''
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FILE='/etc/ssh/sshd_config'
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# This function will be called if the script status is on enabled / audit mode
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audit() {
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is_pkg_installed "$PACKAGE"
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if [ "$FNRET" != 0 ]; then
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ok "$PACKAGE is not installed!"
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else
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ok "$PACKAGE is installed"
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for SSH_OPTION in $OPTIONS; do
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SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
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SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
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PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
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does_pattern_exist_in_file_nocase $FILE "$PATTERN"
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if [ "$FNRET" = 0 ]; then
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ok "$PATTERN is present in $FILE"
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else
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does_pattern_exist_in_file_nocase "$FILE" "^${SSH_PARAM}"
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if [ "$FNRET" != 0 ]; then
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crit "$PATTERN is not present in $FILE"
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else
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VALUE=$($SUDO_CMD grep -i "^${SSH_PARAM}" "$FILE" | tr -s ' ' | cut -d' ' -f2)
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if [ "$VALUE" -gt "$SSH_VALUE" ]; then
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crit "$VALUE is higher than recommended $SSH_VALUE for $SSH_PARAM"
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else
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ok "$VALUE is lower than recommended $SSH_VALUE for $SSH_PARAM"
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fi
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fi
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fi
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done
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply() {
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is_pkg_installed "$PACKAGE"
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if [ "$FNRET" = 0 ]; then
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ok "$PACKAGE is installed"
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else
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crit "$PACKAGE is absent, installing it"
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apt_install "$PACKAGE"
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fi
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for SSH_OPTION in $OPTIONS; do
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SSH_PARAM=$(echo "$SSH_OPTION" | cut -d= -f 1)
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SSH_VALUE=$(echo "$SSH_OPTION" | cut -d= -f 2)
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PATTERN="^${SSH_PARAM}[[:space:]]*$SSH_VALUE"
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does_pattern_exist_in_file_nocase "$FILE" "$PATTERN"
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if [ "$FNRET" = 0 ]; then
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ok "$PATTERN is present in $FILE"
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else
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warn "$PATTERN is not present in $FILE, adding it"
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does_pattern_exist_in_file_nocase "$FILE" "^${SSH_PARAM}"
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if [ "$FNRET" != 0 ]; then
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add_end_of_file "$FILE" "$SSH_PARAM $SSH_VALUE"
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else
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VALUE=$(grep -i "^${SSH_PARAM}" "$FILE" | tr -s ' ' | cut -d' ' -f2)
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if [ "$VALUE" -gt "$SSH_VALUE" ]; then
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warn "$VALUE is higher than recommended $SSH_VALUE for $SSH_PARAM, replacing it"
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replace_in_file "$FILE" "^${SSH_PARAM}[[:space:]]*.*" "$SSH_PARAM $SSH_VALUE"
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else
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ok "$VALUE is lower than recommended $SSH_VALUE for $SSH_PARAM"
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fi
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fi
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/etc/init.d/ssh reload
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fi
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done
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}
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# This function will check config parameters required
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check_config() {
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:
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}
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# This function will check config parameters required
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create_config() {
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cat <<EOF
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status=audit
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# Value of maxsessions
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# Settles sshd maxsessions
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OPTIONS='maxsessions=10'
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EOF
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
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fi
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if [ -z "$CIS_ROOT_DIR" ]; then
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echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
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echo "Cannot source CIS_ROOT_DIR variable, aborting."
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exit 128
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fi
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# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
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if [ -r "$CIS_ROOT_DIR"/lib/main.sh ]; then
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# shellcheck source=../../lib/main.sh
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. "$CIS_ROOT_DIR"/lib/main.sh
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else
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echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
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exit 128
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fi
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