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CHAPTER 29 • SECURING MYSQLwww.it-ebooks.infoColumn Datatype Null DefaultGrant_priv enum('N','Y') No NReferences_priv enum('N','Y') No NIndex_priv enum('N','Y') No NAlter_priv enum('N','Y') No NShow_db_priv enum('N','Y') No NSuper_priv enum('N','Y') No NCreate_tmp_table_priv enum('N','Y') No NLock_tables_priv enum('N','Y') No NExecute_priv enum('N','Y') No NRepl_slave_priv enum('N','Y') No NRepl_client_priv enum('N','Y') No NCreate_view_priv enum('N','Y') No NShow_view_priv enum('N','Y') No NCreate_routine_priv enum('N','Y') No NAlter_routine_priv enum('N','Y') No NCreate_user_priv enum('N','Y') No NEvent_priv enum('N','Y') No NTrigger_priv enum('N','Y') No Nssl_type enum('','ANY','X509','SPECIFIED') No 0ssl_cipher blob No 0x509_issuer blob No 0x509_subject blob No 0564
www.it-ebooks.infoCHAPTER 29 • SECURING MYSQLColumn Datatype Null DefaultMax_questions int(11) unsigned No 0Max_updates int(11) unsigned No 0Max_connections int(11) unsigned No 0Max_user_connections int(11) unsigned No 0HostThe Host column specifies the hostname that determines the host address from which a user canconnect. Addresses can be stored as hostnames, IP addresses, or wildcards. Wildcards can consist ofeither the % or _ character. In addition, <strong>net</strong>masks may be used to represent IP sub<strong>net</strong>s. Several exampleentries follow:User• www.example.com• 192.168.1.2• %• %.example.com• 192.168.1.0/255.255.255.0• localhostThe User column specifies the case-sensitive name of the user capable of connecting to the databaseserver. Although wildcards are not permitted, blank values are. If the entry is empty, any user arrivingfrom the corresponding Host entry will be allowed to log in to the database server. Example entriesfollow:Password• jason• Jason_Gilmore• secretary5The Password column stores the encrypted password supplied by the connecting user. Althoughwildcards are not allowed, blank passwords are. Therefore, make sure that all user accounts areaccompanied by a corresponding password to alleviate potential security issues.Passwords are stored in a one-way hashed format, meaning that they cannot be converted back totheir plain-text format. Furthermore, as of version 4.1, the number of bytes required to store a passwordincreased from 16 bytes to 41 bytes. Therefore, if you’re importing data from a pre-4.1 version and you565
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www.it-ebooks.infoBeginning PHP and
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www.it-ebooks.infoAbout the Author
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www.it-ebooks.info•Acknowledgment
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www.it-ebooks.info• INTRODUCTIONC
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www.it-ebooks.infoC H A P T E R 1
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