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110 lines
3.5 KiB
Bash
Executable File
110 lines
3.5 KiB
Bash
Executable File
#!/bin/bash
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#
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# CIS Debian 7 Hardening
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#
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#
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# 9.3.13 Limit Access via SSH (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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PACKAGE='openssh-server'
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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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OPTIONS="AllowUsers='$ALLOWED_USERS' AllowGroups='$ALLOWED_GROUPS' DenyUsers='$DENIED_USERS' DenyGroups='$DENIED_GROUPS'"
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is_pkg_installed $PACKAGE
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if [ $FNRET != 0 ]; then
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crit "$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 $SSH_OPTION | cut -d= -f 2)
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SSH_VALUE=$(sed "s/'//g" <<< $SSH_VALUE)
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PATTERN="^$SSH_PARAM[[:space:]]*$SSH_VALUE"
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does_pattern_exists_in_file $FILE "$PATTERN"
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if [ $FNRET = 0 ]; then
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ok "$PATTERN is present in $FILE"
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else
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crit "$PATTERN is not present in $FILE"
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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 $SSH_OPTION | cut -d= -f 2)
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SSH_VALUE=$(sed "s/'//g" <<< $SSH_VALUE)
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PATTERN="^$SSH_PARAM[[:space:]]*$SSH_VALUE"
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does_pattern_exists_in_file $FILE "$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 not present in $FILE, adding it"
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does_pattern_exists_in_file $FILE "^$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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info "Parameter $SSH_PARAM is present but with the wrong value -- Fixing"
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replace_in_file $FILE "^$SSH_PARAM[[:space:]]*.*" "$SSH_PARAM $SSH_VALUE"
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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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if [ -z $ALLOWED_USERS ]; then
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info "ALLOWED_USERS is not set, defaults to wildcard"
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ALLOWED_USERS="*"
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fi
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if [ -z $ALLOWED_GROUPS ]; then
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info "ALLOWED_GROUPS is not set, defaults to wildcard"
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ALLOWED_GROUPS="*"
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fi
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if [ -z $DENIED_USERS ]; then
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info "DENIED_USERS is not set, defaults to nobody"
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DENIED_USERS="nobody"
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fi
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if [ -z $DENIED_GROUPS ]; then
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info "DENIED_GROUPS is not set, defaults to nobody"
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DENIED_GROUPS="nobody"
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fi
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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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echo "There is no /etc/default/cis-hardening file, cannot source CIS_ROOT_DIR variable, aborting"
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exit 128
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else
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. /etc/default/cis-hardening
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if [ -z ${CIS_ROOT_DIR:-} ]; then
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echo "No CIS_ROOT_DIR variable, aborting"
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exit 128
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fi
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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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. $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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