Skripti mysql_secure_installation

config=".my.cnf.$$"

command=".mysql.$$"

mysql_client=""

trap "interrupt" 1 2 3 6 15

rootpass=""

echo_n=

echo_c=

set_echo_compat() {

case `echo "testing\c"`,`echo -n testing` in

*c*,-n*) echo_n= echo_c= ;;

*c*,*) echo_n=-n echo_c= ;;

*) echo_n= echo_c='\c' ;;

esac

}

prepare() {

touch $config $command

chmod 600 $config $command

}

find_mysql_client()

{

for n in ./bin/mysql mysql

do

$n --no-defaults --help > /dev/null 2>&1

status=$?

if test $status -eq 0

then

mysql_client=$n

return

fi

done

echo "Can't find a 'mysql' client in PATH or ./bin"

exit 1

}

do_query() {

echo "$1" >$command

#sed 's,^,> ,' < $command # Debugging

$mysql_client --defaults-file=$config <$command

return $?

}

# Simple escape mechanism (\-escape any ' and \), suitable for two contexts:

# - single-quoted SQL strings

# - single-quoted option values on the right hand side of = in my.cnf

#

# These two contexts don't handle escapes identically. SQL strings allow

# quoting any character (\C => C, for any C), but my.cnf parsing allows

# quoting only \, ' or ". For example, password='a\b' quotes a 3-character

# string in my.cnf, but a 2-character string in SQL.

#

# This simple escape works correctly in both places.

basic_single_escape () {

# The quoting on this sed command is a bit complex. Single-quoted strings

# don't allow *any* escape mechanism, so they cannot contain a single

# quote. The string sed gets (as argv[1]) is: s/\(['\]\)/\\\1/g

#

# Inside a character class, \ and ' are not special, so the ['\] character

# class is balanced and contains two characters.

echo "$1" | sed 's/\(['"'"'\]\)/\\\1/g'

}

make_config() {

echo "# mysql_secure_installation config file" >$config

echo "[mysql]" >>$config

echo "user=root" >>$config

esc_pass=`basic_single_escape "$rootpass"`

echo "password='$esc_pass'" >>$config

#sed 's,^,> ,' < $config # Debugging

}

get_root_password() {

status=1

while [ $status -eq 1 ]; do

stty -echo

echo $echo_n "Enter current password for root (enter for none): $echo_c"

read password

echo

stty echo

if [ "x$password" = "x" ]; then

hadpass=0

else

hadpass=1

fi

rootpass=$password

make_config

do_query ""

status=$?

done

echo "OK, successfully used password, moving on..."

echo

}

set_root_password() {

stty -echo

echo $echo_n "New password: $echo_c"

read password1

echo

echo $echo_n "Re-enter new password: $echo_c"

read password2

echo

stty echo

if [ "$password1" != "$password2" ]; then

echo "Sorry, passwords do not match."

echo

return 1

fi

if [ "$password1" = "" ]; then

echo "Sorry, you can't use an empty password here."

echo

return 1

fi

esc_pass=`basic_single_escape "$password1"`

do_query "UPDATE mysql.user SET Password=PASSWORD('$esc_pass') WHERE User='root';"

if [ $? -eq 0 ]; then

echo "Password updated successfully!"

echo "Reloading privilege tables.."

reload_privilege_tables

if [ $? -eq 1 ]; then

clean_and_exit

fi

echo

rootpass=$password1

make_config

else

echo "Password update failed!"

clean_and_exit

fi

return 0

}

remove_anonymous_users() {

do_query "DELETE FROM mysql.user WHERE User='';"

if [ $? -eq 0 ]; then

echo " ... Success!"

else

echo " ... Failed!"

clean_and_exit

fi

return 0

}

remove_remote_root() {

do_query "DELETE FROM mysql.user WHERE User='root' AND Host NOT IN ('localhost', '127.0.0.1', '::1');"

if [ $? -eq 0 ]; then

echo " ... Success!"

else

echo " ... Failed!"

fi

}

remove_test_database() {

echo " - Dropping test database..."

do_query "DROP DATABASE test;"

if [ $? -eq 0 ]; then

echo " ... Success!"

else

echo " ... Failed! Not critical, keep moving..."

fi

echo " - Removing privileges on test database..."

do_query "DELETE FROM mysql.db WHERE Db='test' OR Db='test\\_%'"

if [ $? -eq 0 ]; then

echo " ... Success!"

else

echo " ... Failed! Not critical, keep moving..."

fi

return 0

}

reload_privilege_tables() {

do_query "FLUSH PRIVILEGES;"

if [ $? -eq 0 ]; then

echo " ... Success!"

return 0

else

echo " ... Failed!"

return 1

fi

}

interrupt() {

echo

echo "Aborting!"

echo

cleanup

stty echo

exit 1

}

cleanup() {

echo "Cleaning up..."

rm -f $config $command

}

# Remove the files before exiting.

clean_and_exit() {

cleanup

exit 1

}

# The actual script starts here

prepare

find_mysql_client

set_echo_compat

echo

echo

echo

echo

echo "NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL"

echo " SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!"

echo

echo

echo "In order to log into MySQL to secure it, we'll need the current"

echo "password for the root user. If you've just installed MySQL, and"

echo "you haven't set the root password yet, the password will be blank,"

echo "so you should just press enter here."

echo

get_root_password

#

# Set the root password

#

echo "Setting the root password ensures that nobody can log into the MySQL"

echo "root user without the proper authorisation."

echo

if [ $hadpass -eq 0 ]; then

echo $echo_n "Set root password? [Y/n] $echo_c"

else

echo "You already have a root password set, so you can safely answer 'n'."

echo

echo $echo_n "Change the root password? [Y/n] $echo_c"

fi

read reply

if [ "$reply" = "n" ]; then

echo " ... skipping."

else

status=1

while [ $status -eq 1 ]; do

set_root_password

status=$?

done

fi

echo

#

# Remove anonymous users

#

echo "By default, a MySQL installation has an anonymous user, allowing anyone"

echo "to log into MySQL without having to have a user account created for"

echo "them. This is intended only for testing, and to make the installation"

echo "go a bit smoother. You should remove them before moving into a"

echo "production environment."

echo

echo $echo_n "Remove anonymous users? [Y/n] $echo_c"

read reply

if [ "$reply" = "n" ]; then

echo " ... skipping."

else

remove_anonymous_users

fi

echo

#

# Disallow remote root login

#

echo "Normally, root should only be allowed to connect from 'localhost'. This"

echo "ensures that someone cannot guess at the root password from the network."

echo

echo $echo_n "Disallow root login remotely? [Y/n] $echo_c"

read reply

if [ "$reply" = "n" ]; then

echo " ... skipping."

else

remove_remote_root

fi

echo

#

# Remove test database

#

echo "By default, MySQL comes with a database named 'test' that anyone can"

echo "access. This is also intended only for testing, and should be removed"

echo "before moving into a production environment."

echo

echo $echo_n "Remove test database and access to it? [Y/n] $echo_c"

read reply

if [ "$reply" = "n" ]; then

echo " ... skipping."

else

remove_test_database

fi

echo

#

# Reload privilege tables

#

echo "Reloading the privilege tables will ensure that all changes made so far"

echo "will take effect immediately."

echo

echo $echo_n "Reload privilege tables now? [Y/n] $echo_c"

read reply

if [ "$reply" = "n" ]; then

echo " ... skipping."

else

reload_privilege_tables

fi

echo

cleanup

echo

echo

echo

echo "All done! If you've completed all of the above steps, your MySQL"

echo "installation should now be secure."

echo

echo "Thanks for using MySQL!"

echo

echo