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# -*- mode: sh -*- ### ### mysql bindings for dbconfig-common ### ### all variables and functions fall under the namespace "dbc_foo" and ### "_dbc_foo", depending on whether or not they are "external" ### # get some common functions . ${_dbc_root:-/usr/share/dbconfig-common}/internal/common ## ## pass configuration options securely to the mysql client ## _dbc_generate_mycnf(){ local mycnf l_date mycnf=$(dbc_mktemp dbconfig-common_my.cnf.XXXXXX) || return 1 l_date=$(date) if [ "${_dbc_asuser:-}" ]; then cat << EOF > "$mycnf" # temporary my.cnf generated for usage by dbconfig-common # generated on $l_date # if you're reading this, it probably means something went wrong and # for some strange reason dbconfig-common was not able to clean up after itself. # you can safely delete this file [client] user = '${dbc_dbuser:-}' password = '${dbc_dbpass:-}' host = '${dbc_dbserver:-}' port = '${dbc_dbport:-3306}' [mysqldump] routines EOF else cat << EOF > "$mycnf" # temporary my.cnf generated for usage by dbconfig-common # generated on $l_date # if you're reading this, it probably means something went wrong and # for some strange reason dbconfig-common was not able to clean up after itself. # you can safely delete this file [client] user = '${dbc_dbadmin:-}' password = '${dbc_dbadmpass:-}' host = '${dbc_dbserver:-}' port = '${dbc_dbport:-3306}' [mysqldump] routines EOF fi echo $mycnf } ## ## check that we can actually connect to the specified mysql server ## ## TODO: don't smash stdout/stderr together _dbc_mysql_check_connect(){ local constat mycnf constat="bad" mycnf=$(_dbc_generate_mycnf) dbc_error=$(mysql --defaults-file="$mycnf" </dev/null 2>&1) && constat=good rm -f "$mycnf" if [ "$constat" = "bad" ]; then dbc_logline "$dbc_error" dbc_logline "unable to connect to mysql server" return 1 fi } ## ## execute a file with mysql commands ## ## note this is done without passing any sensitive info on the cmdline ## dbc_mysql_exec_file(){ local l_sqlfile l_retval l_error l_dbname l_errfile mycnf l_sqlfile=$1 l_errfile="$(dbc_mktemp dbconfig-common_sql_exec_error.XXXXXX)" l_retval=0 if [ ! "$l_sqlfile" ]; then dbc_error="no file supplied to execute" dbc_log="no file supplied to execute" rm -f "$l_errfile" return 1 elif [ ! -f "$l_sqlfile" ]; then dbc_error="file $l_sqlfile missing" dbc_log="file $l_sqlfile missing" rm -f "$l_errfile" return 1 fi l_dbname= if [ ! "${_dbc_nodb:-}" ]; then l_dbname="$dbc_dbname" fi mycnf=$(_dbc_generate_mycnf) _dbc_mysql_result=$(mysql --defaults-file="$mycnf" $l_dbname 2>"$l_errfile" <"$l_sqlfile") || l_retval=$? if [ $l_retval != 0 ]; then dbc_error="mysql said: $(cat "$l_errfile")" fi rm -f "$mycnf" "$l_errfile" return $l_retval } ## ## execute a specific mysql command ## ## note this is done without passing any sensitive info on the cmdline, ## including the mysql command itself ## dbc_mysql_exec_command(){ local statement l_sqlfile l_retval statement="$@" l_retval=0 l_sqlfile=$(dbc_mktemp dbconfig-common_sqlfile.XXXXXX) cat << EOF > "$l_sqlfile" $statement EOF dbc_mysql_exec_file "$l_sqlfile" l_retval=$? rm -f "$l_sqlfile" return $l_retval } ## ## check for the existance of a specified database ## _dbc_mysql_check_database(){ local dbc_dbname l_retval _dbc_nodb dbc_dbname=$1 l_retval=0 _dbc_nodb="yes" dbc_mysql_exec_command "SHOW DATABASES" 2>/dev/null || l_retval=$? if [ $l_retval = 0 ] ; then echo "$_dbc_mysql_result" | grep -q "^$dbc_dbname\$" || l_retval=$? fi return $l_retval } ## ## check for access for a specific user ## ## this works by checking the grants for the user, so we can verify that ## not only does the user exist, but that it should be able to connect ## dbc_mysql_check_user(){ local l_retval _dbc_nodb l_retval=0 _dbc_nodb="yes" _dbc_sanity_check dbuser dballow || return 1 dbc_mysql_exec_command "SHOW GRANTS FOR '$dbc_dbuser'@'$dbc_dballow'" || \ l_retval=$? if [ $l_retval = 0 ] ; then echo "$_dbc_mysql_result" | grep -qi "GRANT .* ON \`$dbc_dbname\`" || \ l_retval=$? fi return $l_retval } ### ### externally supplied functions ### ### included inline are some slightly modified / corrected comments from ### the respective original functions provided by wwwconfig-common, and ### comments of similar style for new functions ### ### all functions return non-zero on error ### dbc_mysql_createdb(){ local ret l_dbname _dbc_nodb if [ "${_dbc_asuser:-}" ] ; then _dbc_sanity_check dbname dbuser mysql || return 1 else _dbc_sanity_check dbname dbadmin mysql || return 1 fi _dbc_mysql_check_connect || return 1 dbc_logpart "creating database $dbc_dbname:" if _dbc_mysql_check_database "$dbc_dbname"; then dbc_logline "already exists" else if [ "${dbc_mysql_createdb_encoding:-}" ]; then extrasql=" CHARACTER SET '$dbc_mysql_createdb_encoding'"; fi _dbc_nodb="yes" dbc_mysql_exec_command "CREATE DATABASE \`$dbc_dbname\`${extrasql:-}" ret=$? _dbc_nodb="" if [ "$ret" = "0" ]; then dbc_logline "success" dbc_logpart "verifying database $dbc_dbname exists:" if ! _dbc_mysql_check_database "$dbc_dbname"; then dbc_logline "failed" return 1 else dbc_logline "success" fi else dbc_logline "failed" return 1 fi fi } # File: mysql-dropdb.sh # Needs: $dbc_dbname - the database that user should have access to. # $dbc_dbserver - the server to connect to. # $dbc_dbadmin - the administrator name. # or $dbc_dbuser - the user name (with _dbc_asuser set) # $dbc_dbadmpass - the administrator password. # or $dbc_dbpass - the user password (with _dbc_asuser set) # Description: drops a database. dbc_mysql_dropdb(){ if [ "${_dbc_asuser:-}" ] ; then _dbc_sanity_check dbname dbuser mysql || return 1 else _dbc_sanity_check dbname dbadmin mysql || return 1 fi _dbc_mysql_check_connect || return 1 dbc_logpart "dropping database $dbc_dbname:" if _dbc_mysql_check_database "$dbc_dbname"; then if dbc_mysql_exec_command "DROP DATABASE \`$dbc_dbname\`"; then dbc_logline "success" dbc_logpart "verifying database $dbc_dbname was dropped:" if _dbc_mysql_check_database "$dbc_dbname"; then dbc_logline "failed" return 1 else dbc_logline "success" fi else dbc_logline "failed" return 1 fi else dbc_logline "database does not exist" fi } # File: mysql-createuser.sh # Description: Creates or replaces a database user. # Needs: $dbc_dbuser - the user name to create (or replace). # $dbc_dballow - what hosts to allow. defaults to localhost/hostname # $dbc_dbname - the database that user should have access to. # $dbc_dbpass - the password to use. # $dbc_dbserver - the server to connect to (defaults to localhost). # $dbc_dbadmin - the administrator name. # $dbc_dbadmpass - the administrator password. dbc_mysql_createuser(){ local l_sqlfile l_dbname l_ret l_user_can_login l_do_grant _dbc_sanity_check dbuser dbname dbadmin dballow mysql || return 1 _dbc_mysql_check_connect || return 1 l_do_grant=0 l_ret=0 dbc_logpart "checking privileges on database $dbc_dbname for $dbc_dbuser@$dbc_dballow:" # First check if the user can already log in, then we don't have anything # todo. _dbc_asuser=true l_user_can_login=0 dbc_mysql_check_user || l_user_can_login=$? _dbc_asuser="" if [ "$l_user_can_login" = 0 ] ; then dbc_logline "ok" l_do_grant=1 elif dbc_mysql_check_user ; then # The user now exists, but not with the right credentials, so now we # need to check if the password can be changed safely, i.e. the user # only has grants on the $dbc_dbname. # The answer to the query should be 0 if we can update the password. dbc_mysql_exec_command "select count(*) from mysql.db where user='$dbc_dbuser' and host='$dbc_dballow' and db not like '$dbc_dbname';" || l_ret=$? if [ "$l_ret" != 0 ] ; then dbc_logline "failed" return $l_ret fi if [ "$_dbc_mysql_result" = \ "count(*) 0" ] ; then dbc_logline "password update needed" l_do_grant=0 else dbc_error="Password mismatch for $dbc_dbuser@$dbc_dballow and not allowed to update because user has privileges on multiple databases" return 1 fi else dbc_logline "user creation needed" fi if [ "$l_do_grant" = 0 ] ; then dbc_logpart "granting access to database $dbc_dbname for $dbc_dbuser@$dbc_dballow:" l_sqlfile=$(dbc_mktemp dbconfig-common.sql.XXXXXX) cat << EOF > "$l_sqlfile" CREATE USER IF NOT EXISTS '$dbc_dbuser'@'$dbc_dballow'; EOF # Mysql and MariaDB differ in GRANT SQL command: # - MySQL dropped PASSWORD() function support # - MySQL uses IDENTIFIED WITH 'plugin' BY 'password' # - MariaDB uses IDENTIFIED WITH 'plugin' USING 'password' # The way used bellow makes both behave the same. if [ "$dbc_authplugin" != "default" ]; then cat << EOF >> "$l_sqlfile" ALTER USER '$dbc_dbuser'@'$dbc_dballow' IDENTIFIED WITH '$dbc_authplugin'; EOF fi cat << EOF >> "$l_sqlfile" ALTER USER '$dbc_dbuser'@'$dbc_dballow' IDENTIFIED BY '$(dbc_mysql_escape_str "$dbc_dbpass")'; GRANT ALL PRIVILEGES ON \`$dbc_dbname\`.* TO '$dbc_dbuser'@'$dbc_dballow'; FLUSH PRIVILEGES; EOF l_dbname=$dbc_dbname _dbc_nodb="yes" dbc_mysql_exec_file "$l_sqlfile" l_ret=$? _dbc_nodb="" if [ "$l_ret" = "0" ]; then dbc_logline "success" dbc_logpart "verifying access for $dbc_dbuser@$dbc_dballow:" if ! dbc_mysql_check_user ; then l_ret=1 dbc_logline "failed" else dbc_logline "success" fi else dbc_logline "failed" fi rm -f "$l_sqlfile" fi return $l_ret } # File: mysql-dropuser.sh # Needs: $dbc_dbuser - the user name to create (or replace). # $dbc_dballow - what hosts to allow (defaults to %). # $dbc_dbname - the database that user should have access to. # $dbc_dbserver - the server to connect to. # $dbc_dbadmin - the administrator name. # $dbc_dbadmpass - the administrator password. # Description: drops a database user. dbc_mysql_dropuser(){ local l_sqlfile l_ret _dbc_nodb _dbc_sanity_check dbuser dbname dbadmin dballow mysql || return 1 _dbc_mysql_check_connect || return 1 dbc_logpart "revoking access to database $dbc_dbname from $dbc_dbuser@$dbc_dballow:" if ! dbc_mysql_check_user; then dbc_logline "access does not exist" else l_sqlfile=$(dbc_mktemp dbconfig-common.sql.XXXXXX) cat << EOF > "$l_sqlfile" REVOKE ALL PRIVILEGES ON \`$dbc_dbname\`.* FROM '$dbc_dbuser'@'$dbc_dballow'; FLUSH PRIVILEGES; EOF _dbc_nodb="yes" if dbc_mysql_exec_file "$l_sqlfile" 2>/dev/null; then dbc_logline "success" l_ret=0 else dbc_logline "failed" l_ret=1 fi # XXX no verification! rm -f "$l_sqlfile" return $l_ret fi } ## ## perform mysqldump ## dbc_mysql_dump(){ local mycnf dumperr db dumpfile old_umask if [ "${_dbc_asuser:-}" ]; then _dbc_sanity_check dbname dbuser mysql || return 1 else _dbc_sanity_check dbname dbadmin mysql || return 1 fi _dbc_mysql_check_connect || return 1 dumpfile=$1 dumperr=0 old_umask=$(umask) if _dbc_mysql_check_database "$dbc_dbname"; then umask 0066 mycnf=$(_dbc_generate_mycnf) dbc_error=$(mysqldump --defaults-file="$mycnf" $dbc_dbname 2>&1 >"$dumpfile") || dumperr=1 umask $old_umask rm -f "$mycnf" else dbc_logline "database does not exist" fi return $dumperr } ## ## basic installation check ## dbc_mysql_db_installed(){ command -v mysqld >/dev/null } ## ## dbc_mysql_escape_str: properly escape strings passed to mysql queries ## dbc_mysql_escape_str(){ sed -e 's,\\,\\&,g' -e "s,',\\\\&,g" << EOF $1 EOF } ## ## _dbc_mysql_get_debian_maint_sys: obtain the credentials of the MySQL/MariaDB ## /etc/mysql/debian.cnf file when appropriate ## _dbc_mysql_get_debian_sys_maint(){ # Make sure we only return zero in case everything was really alright # Technically, I would like to use _dbc_islocalhost, but it turns out that # both MySQLs debian-sys-maint and MariaDBs root really only works with # "localhost" and not IP based localhosts like 127.0.0.1 if [ "$dbc_dbserver" != "" ] && [ "$dbc_dbserver" != localhost ] ; then _dbc_debug "_dbc_mysql_get_debian_sys_maint: not localhost" return 1 fi # Of course we can only do our thing if the proper file exists if [ ! -f /etc/mysql/debian.cnf ] ; then _dbc_debug "_dbc_mysql_get_debian_sys_maint: no /etc/mysql/debian.cnf" return 1 fi dbc_logpart "Determining localhost credentials from /etc/mysql/debian.cnf:" # Now we have something to process. Although the file says, "DO NOT # TOUCH", we do some sanity checks here # expected sections are present # host is localhost # password is plain or empty # host/user/password exist twice and equal if ! $(grep -q "^\[client\]$" /etc/mysql/debian.cnf) ; then dbc_logline "failed (no client section)" return 1 fi if ! $(grep -q "^\[mysql_upgrade\]$" /etc/mysql/debian.cnf) ; then dbc_logline "failed (no upgrade section)" return 1 fi if [ "$(grep -m1 "^[ ]*host" /etc/mysql/debian.cnf)" != \ "$(grep -m2 "^[ ]*host" /etc/mysql/debian.cnf | tail -n1)" ] ; then dbc_logline "failed (hosts not equal)" return 1 fi if [ "$(grep -m1 "^[ ]*user" /etc/mysql/debian.cnf)" != \ "$(grep -m2 "^[ ]*user" /etc/mysql/debian.cnf | tail -n1)" ] ; then dbc_logline "failed (users not equal)" return 1 fi if [ "$(grep -m1 "^[ ]*password" /etc/mysql/debian.cnf)" != \ "$(grep -m2 "^[ ]*password" /etc/mysql/debian.cnf | tail -n1)" ] ; then dbc_logline "failed (password not equal)" return 1 fi if [ "$(grep -m1 "^[ ]*host" /etc/mysql/debian.cnf | awk '{print $3}')" != \ "localhost" ] ; then dbc_logline "failed (not localhost)" return 1 fi # Now we are pretty sure we can use the password # Command taken from mysql-server-5.5.postinst script dbc_dbadmpass="$(sed -n 's/^[ ]*password *= *// p' /etc/mysql/debian.cnf | head -n 1)" # We also want to obtain the dbc_dbadmin from this file as MySQL has # debian-sys-maint, but MariaDB may have root. dbc_dbadmin="$(sed -n 's/^[ ]*user *= *// p' /etc/mysql/debian.cnf | head -n 1)" dbc_logline succeeded return 0 }