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>MySQL Permissions &#38; Grant Tables</TITLE
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NAME="granttables">C.3. MySQL Permissions &#38; Grant Tables</H1
><DIV
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>The following portion of documentation comes from my
	answer to an old discussion of Keystone, a cool product that
	does trouble-ticket tracking for IT departments.  I wrote this
	post to the  Keystone support group regarding MySQL grant
	table permissions, and how to use them effectively. It is
	badly in need of updating, as I believe MySQL has added a
	field or two to the grant tables  since this time, but it
	serves as a decent introduction and troubleshooting document
	for grant table issues.  I used Keynote to track my troubles
	until I discovered Bugzilla, which gave me a whole new set of
	troubles to work on : )  Although it is of limited use, it
	still has SOME use, thus it's still included.</P
><P
>&#13;	Please note, however, that I was a relatively new user to
	MySQL at the time.  Some of my suggestions, particularly in
	how to set up security, showed a terrible lack of
	security-related database experience.
      </P
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><br>
From&nbsp;matt_barnson@singletrac.com&nbsp;Wed&nbsp;Jul&nbsp;&nbsp;7&nbsp;09:00:07&nbsp;1999<br>
Date:&nbsp;Mon,&nbsp;1&nbsp;Mar&nbsp;1999&nbsp;21:37:04&nbsp;-0700&nbsp;<br>
From:&nbsp;Matthew&nbsp;Barnson&nbsp;matt_barnson@singletrac.com<br>
To:&nbsp;keystone-users@homeport.org<br>
Subject:&nbsp;[keystone-users]&nbsp;Grant&nbsp;Tables&nbsp;FAQ<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;[The&nbsp;following&nbsp;text&nbsp;is&nbsp;in&nbsp;the&nbsp;"iso-8859-1"&nbsp;character&nbsp;set]<br>
&nbsp;&nbsp;&nbsp;&nbsp;[Your&nbsp;display&nbsp;is&nbsp;set&nbsp;for&nbsp;the&nbsp;"US-ASCII"&nbsp;character&nbsp;set]<br>
&nbsp;&nbsp;&nbsp;&nbsp;[Some&nbsp;characters&nbsp;may&nbsp;be&nbsp;displayed&nbsp;incorrectly]<br>
<br>
Maybe&nbsp;we&nbsp;can&nbsp;include&nbsp;this&nbsp;rambling&nbsp;message&nbsp;in&nbsp;the&nbsp;Keystone&nbsp;FAQ?&nbsp;&nbsp;It&nbsp;gets<br>
asked&nbsp;a&nbsp;lot,&nbsp;and&nbsp;the&nbsp;only&nbsp;option&nbsp;current&nbsp;listed&nbsp;in&nbsp;the&nbsp;FAQ&nbsp;is<br>
"--skip-grant-tables".<br>
<br>
Really,&nbsp;you&nbsp;can't&nbsp;go&nbsp;wrong&nbsp;by&nbsp;reading&nbsp;section&nbsp;6&nbsp;of&nbsp;the&nbsp;MySQL&nbsp;manual,&nbsp;at<br>
http://www.mysql.com/Manual/manual.html.&nbsp;&nbsp;I&nbsp;am&nbsp;sure&nbsp;their&nbsp;description&nbsp;is<br>
better&nbsp;than&nbsp;mine.<br>
<br>
MySQL&nbsp;runs&nbsp;fine&nbsp;without&nbsp;permissions&nbsp;set&nbsp;up&nbsp;correctly&nbsp;if&nbsp;you&nbsp;run&nbsp;the&nbsp;mysql<br>
daemon&nbsp;with&nbsp;the&nbsp;"--skip-grant-tables"&nbsp;option.&nbsp;&nbsp;Running&nbsp;this&nbsp;way&nbsp;denies<br>
access&nbsp;to&nbsp;nobody.&nbsp;&nbsp;Unfortunately,&nbsp;unless&nbsp;you've&nbsp;got&nbsp;yourself&nbsp;firewalled&nbsp;it<br>
also&nbsp;opens&nbsp;the&nbsp;potential&nbsp;for&nbsp;abuse&nbsp;if&nbsp;someone&nbsp;knows&nbsp;you're&nbsp;running&nbsp;it.<br>
<br>
Additionally,&nbsp;the&nbsp;default&nbsp;permissions&nbsp;for&nbsp;MySQL&nbsp;allow&nbsp;anyone&nbsp;at&nbsp;localhost<br>
access&nbsp;to&nbsp;the&nbsp;database&nbsp;if&nbsp;the&nbsp;database&nbsp;name&nbsp;begins&nbsp;with&nbsp;"test_"&nbsp;or&nbsp;is&nbsp;named<br>
"test"&nbsp;(i.e.&nbsp;"test_keystone").&nbsp;&nbsp;You&nbsp;can&nbsp;change&nbsp;the&nbsp;name&nbsp;of&nbsp;your&nbsp;database&nbsp;in<br>
the&nbsp;keystone.conf&nbsp;file&nbsp;($sys_dbname).&nbsp;&nbsp;This&nbsp;is&nbsp;the&nbsp;way&nbsp;I&nbsp;am&nbsp;doing&nbsp;it&nbsp;for<br>
some&nbsp;of&nbsp;my&nbsp;databases,&nbsp;and&nbsp;it&nbsp;works&nbsp;fine.<br>
<br>
The&nbsp;methods&nbsp;described&nbsp;below&nbsp;assume&nbsp;you're&nbsp;running&nbsp;MySQL&nbsp;on&nbsp;the&nbsp;same&nbsp;box&nbsp;as<br>
your&nbsp;webserver,&nbsp;and&nbsp;that&nbsp;you&nbsp;don't&nbsp;mind&nbsp;if&nbsp;your&nbsp;$sys_dbuser&nbsp;for&nbsp;Keystone&nbsp;has<br>
superuser&nbsp;access.&nbsp;&nbsp;See&nbsp;near&nbsp;the&nbsp;bottom&nbsp;of&nbsp;this&nbsp;message&nbsp;for&nbsp;a&nbsp;description&nbsp;of<br>
what&nbsp;each&nbsp;field&nbsp;does.<br>
<br>
Method&nbsp;#1:<br>
<br>
1.&nbsp;&nbsp;cd&nbsp;/var/lib<br>
	#location&nbsp;where&nbsp;you'll&nbsp;want&nbsp;to&nbsp;run&nbsp;/usr/bin/mysql_install_db&nbsp;shell<br>
script&nbsp;from&nbsp;to&nbsp;get&nbsp;it&nbsp;to&nbsp;work.<br>
<br>
2.&nbsp;&nbsp;ln&nbsp;-s&nbsp;mysql&nbsp;data&nbsp;&nbsp;<br>
	#&nbsp;soft&nbsp;links&nbsp;the&nbsp;"mysql"&nbsp;directory&nbsp;to&nbsp;"data",&nbsp;which&nbsp;is&nbsp;what<br>
mysql_install_db&nbsp;expects.&nbsp;&nbsp;Alternately,&nbsp;you&nbsp;can&nbsp;edit&nbsp;mysql_install_db&nbsp;and<br>
change&nbsp;all&nbsp;the&nbsp;"./data"&nbsp;references&nbsp;to&nbsp;"./mysql".<br>
<br>
3.&nbsp;&nbsp;Edit&nbsp;/usr/bin/mysql_install_db&nbsp;with&nbsp;your&nbsp;favorite&nbsp;text&nbsp;editor&nbsp;(vi,<br>
emacs,&nbsp;jot,&nbsp;pico,&nbsp;etc.)<br>
A)&nbsp;&nbsp;Copy&nbsp;the&nbsp;"INSERT&nbsp;INTO&nbsp;db&nbsp;VALUES<br>
('%','test\_%','','Y','Y','Y','Y','Y','Y');"&nbsp;and&nbsp;paste&nbsp;it&nbsp;immediately&nbsp;after<br>
itself.&nbsp;&nbsp;Chage&nbsp;the&nbsp;'test\_%'&nbsp;value&nbsp;to&nbsp;'keystone',&nbsp;or&nbsp;the&nbsp;value&nbsp;of<br>
$sys_dbname&nbsp;in&nbsp;keystone.conf.<br>
B)&nbsp;&nbsp;If&nbsp;you&nbsp;are&nbsp;running&nbsp;your&nbsp;keystone&nbsp;database&nbsp;with&nbsp;any&nbsp;user,&nbsp;you'll&nbsp;need&nbsp;to<br>
copy&nbsp;the&nbsp;"INSERT&nbsp;INTO&nbsp;user&nbsp;VALUES<br>
('localhost','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y');"&nbsp;line&nbsp;after<br>
itself&nbsp;and&nbsp;change&nbsp;'root'&nbsp;to&nbsp;the&nbsp;name&nbsp;of&nbsp;the&nbsp;keystone&nbsp;database&nbsp;user<br>
($sys_dbuser)&nbsp;in&nbsp;keystone.conf.<br>
<br>
	#&nbsp;adds&nbsp;entries&nbsp;to&nbsp;the&nbsp;script&nbsp;to&nbsp;create&nbsp;grant&nbsp;tables&nbsp;for&nbsp;specific<br>
hosts&nbsp;and&nbsp;users.&nbsp;&nbsp;The&nbsp;user&nbsp;you&nbsp;set&nbsp;up&nbsp;has&nbsp;super-user&nbsp;access&nbsp;($sys_dbuser)&nbsp;--<br>
you&nbsp;may&nbsp;or&nbsp;may&nbsp;not&nbsp;want&nbsp;this.&nbsp;&nbsp;The&nbsp;layout&nbsp;of&nbsp;mysql_install_db&nbsp;is&nbsp;really&nbsp;very<br>
uncomplicated.<br>
<br>
4.&nbsp;&nbsp;/usr/bin/mysqladmin&nbsp;shutdown<br>
	#&nbsp;ya&nbsp;gotta&nbsp;shut&nbsp;it&nbsp;down&nbsp;before&nbsp;you&nbsp;can&nbsp;reinstall&nbsp;the&nbsp;grant&nbsp;tables!<br>
<br>
5.&nbsp;&nbsp;rm&nbsp;-i&nbsp;/var/lib/mysql/mysql/*.IS?'&nbsp;and&nbsp;answer&nbsp;'Y'&nbsp;to&nbsp;the&nbsp;deletion<br>
questions.<br>
	#&nbsp;nuke&nbsp;your&nbsp;current&nbsp;grant&nbsp;tables.&nbsp;&nbsp;This&nbsp;WILL&nbsp;NOT&nbsp;delete&nbsp;any&nbsp;other<br>
databases&nbsp;than&nbsp;your&nbsp;grant&nbsp;tables.<br>
<br>
6.&nbsp;&nbsp;/usr/bin/mysql_install_db<br>
	#&nbsp;run&nbsp;the&nbsp;script&nbsp;you&nbsp;just&nbsp;edited&nbsp;to&nbsp;install&nbsp;your&nbsp;new&nbsp;grant&nbsp;tables.<br>
<br>
7.&nbsp;&nbsp;mysqladmin&nbsp;-u&nbsp;root&nbsp;password&nbsp;(new_password)&nbsp;&nbsp;<br>
	#&nbsp;change&nbsp;the&nbsp;root&nbsp;MySQL&nbsp;password,&nbsp;or&nbsp;else&nbsp;anyone&nbsp;on&nbsp;localhost&nbsp;can<br>
login&nbsp;to&nbsp;MySQL&nbsp;as&nbsp;root&nbsp;and&nbsp;make&nbsp;changes.&nbsp;&nbsp;You&nbsp;can&nbsp;skip&nbsp;this&nbsp;step&nbsp;if&nbsp;you&nbsp;want<br>
keystone&nbsp;to&nbsp;connect&nbsp;as&nbsp;root&nbsp;with&nbsp;no&nbsp;password.<br>
<br>
8.&nbsp;&nbsp;mysqladmin&nbsp;-u&nbsp;(webserver_user_name)&nbsp;password&nbsp;(new_password)&nbsp;&nbsp;<br>
	#&nbsp;change&nbsp;the&nbsp;password&nbsp;of&nbsp;the&nbsp;$sys_dbuser.&nbsp;&nbsp;Note&nbsp;that&nbsp;you&nbsp;will&nbsp;need<br>
to&nbsp;change&nbsp;the&nbsp;password&nbsp;in&nbsp;the&nbsp;keystone.conf&nbsp;file&nbsp;as&nbsp;well&nbsp;in&nbsp;$sys_dbpasswd,<br>
and&nbsp;if&nbsp;your&nbsp;permissions&nbsp;are&nbsp;set&nbsp;up&nbsp;incorrectly&nbsp;anybody&nbsp;can&nbsp;type&nbsp;the&nbsp;URL&nbsp;to<br>
your&nbsp;keystone.conf&nbsp;file&nbsp;and&nbsp;get&nbsp;the&nbsp;password.&nbsp;&nbsp;Not&nbsp;that&nbsp;this&nbsp;will&nbsp;help&nbsp;them<br>
much&nbsp;if&nbsp;your&nbsp;permissions&nbsp;are&nbsp;set&nbsp;to&nbsp;@localhost.<br>
<br>
<br>
<br>
Method&nbsp;#2:&nbsp;&nbsp;easier,&nbsp;but&nbsp;a&nbsp;pain&nbsp;reproducing&nbsp;if&nbsp;you&nbsp;have&nbsp;to&nbsp;delete&nbsp;your&nbsp;grant<br>
tables.&nbsp;&nbsp;This&nbsp;is&nbsp;the&nbsp;"recommended"&nbsp;method&nbsp;for&nbsp;altering&nbsp;grant&nbsp;tables&nbsp;in<br>
MySQL.&nbsp;&nbsp;I&nbsp;don't&nbsp;use&nbsp;it&nbsp;because&nbsp;I&nbsp;like&nbsp;the&nbsp;other&nbsp;way&nbsp;:)<br>
<br>
shell&#62;&nbsp;mysql&nbsp;--user=root&nbsp;keystone<br>
<br>
mysql&#62;&nbsp;GRANT<br>
SELECT,INSERT,UPDATE,DELETE,INDEX,ALTER,CREATE,DROP,RELOAD,SHUTDOWN,PROCESS,<br>
FILE,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ON&nbsp;keystone.*<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;TO&nbsp;&#60;$sys_dbuser&nbsp;name&#62;@localhost<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IDENTIFIED&nbsp;BY&nbsp;'(password)'<br>
	&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WITH&nbsp;GRANT&nbsp;OPTION;<br>
<br>
OR<br>
<br>
mysql&#62;&nbsp;GRANT&nbsp;ALL&nbsp;PRIVILEGES&nbsp;<br>
		ON&nbsp;keystone.*<br>
		TO&nbsp;&#60;$sys_dbuser&nbsp;name&#62;@localhost<br>
		IDENTIFIED&nbsp;BY&nbsp;'(password)'<br>
		WITH&nbsp;GRANT&nbsp;OPTION;<br>
<br>
	#&nbsp;this&nbsp;grants&nbsp;the&nbsp;required&nbsp;permissions&nbsp;to&nbsp;the&nbsp;keystone&nbsp;($sys_dbuser)<br>
account&nbsp;defined&nbsp;in&nbsp;keystone.conf.&nbsp;&nbsp;However,&nbsp;if&nbsp;you&nbsp;are&nbsp;runnning&nbsp;many<br>
different&nbsp;MySQL-based&nbsp;apps,&nbsp;as&nbsp;we&nbsp;are,&nbsp;it's&nbsp;generally&nbsp;better&nbsp;to&nbsp;edit&nbsp;the<br>
mysql_install_db&nbsp;script&nbsp;to&nbsp;be&nbsp;able&nbsp;to&nbsp;quickly&nbsp;reproduce&nbsp;your&nbsp;permissions<br>
structure&nbsp;again.&nbsp;&nbsp;Note&nbsp;that&nbsp;the&nbsp;FILE&nbsp;privelege&nbsp;and&nbsp;WITH&nbsp;GRANT&nbsp;OPTION&nbsp;may&nbsp;not<br>
be&nbsp;in&nbsp;your&nbsp;best&nbsp;interest&nbsp;to&nbsp;include.<br>
<br>
<br>
GRANT&nbsp;TABLE&nbsp;FIELDS&nbsp;EXPLANATION:<br>
Quick&nbsp;syntax&nbsp;summary:&nbsp;&nbsp;"%"&nbsp;in&nbsp;MySQL&nbsp;is&nbsp;a&nbsp;wildcard.&nbsp;&nbsp;I.E.,&nbsp;if&nbsp;you&nbsp;are<br>
defining&nbsp;your&nbsp;DB&nbsp;table&nbsp;and&nbsp;in&nbsp;the&nbsp;'host'&nbsp;field&nbsp;and&nbsp;enter&nbsp;'%',&nbsp;that&nbsp;means<br>
that&nbsp;any&nbsp;host&nbsp;can&nbsp;access&nbsp;that&nbsp;database.&nbsp;&nbsp;Of&nbsp;course,&nbsp;that&nbsp;host&nbsp;must&nbsp;also&nbsp;have<br>
a&nbsp;valid&nbsp;db&nbsp;user&nbsp;in&nbsp;order&nbsp;to&nbsp;do&nbsp;anything&nbsp;useful.&nbsp;&nbsp;'db'=name&nbsp;of&nbsp;database.&nbsp;&nbsp;In<br>
our&nbsp;case,&nbsp;it&nbsp;should&nbsp;be&nbsp;"keystone".&nbsp;&nbsp;"user"&nbsp;should&nbsp;be&nbsp;your&nbsp;"$sys_dbuser"<br>
defined&nbsp;in&nbsp;keystone.conf.&nbsp;&nbsp;Note&nbsp;that&nbsp;you&nbsp;CANNOT&nbsp;add&nbsp;or&nbsp;change&nbsp;a&nbsp;password&nbsp;by<br>
using&nbsp;the&nbsp;"INSERT&nbsp;INTO&nbsp;db&nbsp;(X)"&nbsp;command&nbsp;--&nbsp;you&nbsp;must&nbsp;change&nbsp;it&nbsp;with&nbsp;the&nbsp;mysql<br>
-u&nbsp;command&nbsp;as&nbsp;defined&nbsp;above.&nbsp;&nbsp;Passwords&nbsp;are&nbsp;stored&nbsp;encrypted&nbsp;in&nbsp;the&nbsp;MySQL<br>
database,&nbsp;and&nbsp;if&nbsp;you&nbsp;try&nbsp;to&nbsp;enter&nbsp;it&nbsp;directly&nbsp;into&nbsp;the&nbsp;table&nbsp;they&nbsp;will&nbsp;not<br>
match.<br>
<br>
TABLE:&nbsp;&nbsp;USER.&nbsp;&nbsp;Everything&nbsp;after&nbsp;"password"&nbsp;is&nbsp;a&nbsp;privelege&nbsp;granted&nbsp;(Y/N).<br>
This&nbsp;table&nbsp;controls&nbsp;individual&nbsp;user&nbsp;global&nbsp;access&nbsp;rights.<br>
<br>
'host','user','password','select','insert','update','delete','index','alter'<br>
,'create','drop','grant','reload','shutdown','process','file'<br>
<br>
TABLE:&nbsp;&nbsp;DB.&nbsp;&nbsp;This&nbsp;controls&nbsp;access&nbsp;of&nbsp;USERS&nbsp;to&nbsp;databases.<br>
<br>
'host','db','user','select','insert','update','delete','index','alter','crea<br>
te','drop','grant'<br>
<br>
TABLE:&nbsp;&nbsp;HOST.&nbsp;&nbsp;This&nbsp;controls&nbsp;which&nbsp;HOSTS&nbsp;are&nbsp;allowed&nbsp;what&nbsp;global&nbsp;access<br>
rights.&nbsp;&nbsp;Note&nbsp;that&nbsp;the&nbsp;HOST&nbsp;table,&nbsp;USER&nbsp;table,&nbsp;and&nbsp;DB&nbsp;table&nbsp;are&nbsp;very&nbsp;closely<br>
connected&nbsp;--&nbsp;if&nbsp;an&nbsp;authorized&nbsp;USER&nbsp;attempts&nbsp;an&nbsp;SQL&nbsp;request&nbsp;from&nbsp;an<br>
unauthorized&nbsp;HOST,&nbsp;she's&nbsp;denied.&nbsp;&nbsp;If&nbsp;a&nbsp;request&nbsp;from&nbsp;an&nbsp;authorized&nbsp;HOST&nbsp;is<br>
not&nbsp;an&nbsp;authorized&nbsp;USER,&nbsp;it&nbsp;is&nbsp;denied.&nbsp;&nbsp;If&nbsp;a&nbsp;globally&nbsp;authorized&nbsp;USER&nbsp;does<br>
not&nbsp;have&nbsp;rights&nbsp;to&nbsp;a&nbsp;certain&nbsp;DB,&nbsp;she's&nbsp;denied.&nbsp;&nbsp;Get&nbsp;the&nbsp;picture?<br>
<br>
'host','db','select','insert','update','delete','index','alter','create','dr<br>
op','grant'<br>
<br>
<br>
You&nbsp;should&nbsp;now&nbsp;have&nbsp;a&nbsp;working&nbsp;knowledge&nbsp;of&nbsp;MySQL&nbsp;grant&nbsp;tables.&nbsp;&nbsp;If&nbsp;there&nbsp;is<br>
anything&nbsp;I've&nbsp;left&nbsp;out&nbsp;of&nbsp;this&nbsp;answer&nbsp;that&nbsp;you&nbsp;feel&nbsp;is&nbsp;pertinent,&nbsp;or&nbsp;if&nbsp;my<br>
instructions&nbsp;don't&nbsp;work&nbsp;for&nbsp;you,&nbsp;please&nbsp;let&nbsp;me&nbsp;know&nbsp;and&nbsp;I'll&nbsp;re-post&nbsp;this<br>
letter&nbsp;again,&nbsp;corrected.&nbsp;&nbsp;I&nbsp;threw&nbsp;it&nbsp;together&nbsp;one&nbsp;night&nbsp;out&nbsp;of&nbsp;exasperation<br>
for&nbsp;all&nbsp;the&nbsp;newbies&nbsp;who&nbsp;don't&nbsp;know&nbsp;squat&nbsp;about&nbsp;MySQL&nbsp;yet,&nbsp;so&nbsp;it&nbsp;is&nbsp;almost<br>
guaranteed&nbsp;to&nbsp;have&nbsp;errors.<br>
<br>
Once&nbsp;again,&nbsp;you&nbsp;can't&nbsp;go&nbsp;wrong&nbsp;by&nbsp;reading&nbsp;section&nbsp;6&nbsp;of&nbsp;the&nbsp;MySQL&nbsp;manual.&nbsp;&nbsp;It<br>
is&nbsp;more&nbsp;detailed&nbsp;than&nbsp;I!<br>
http://www.mysql.com/Manual/manual.html.<br>
<br>
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