分类目录归档:MySQL

又一起mysql rm删除数据库目录事故

有mysql用户直接使用rm命令删除了所在数据库目录文件夹(删除途中发现删除错误,直接强制终止使得部分删除,部分文件得以保留),如果数据库没有crash,这个问题不大,可以直接通过句柄进行恢复出来对应的ibd文件,然后进行一些特殊处理,数据理论上不会有丢失,参见:mysql 数据库目录被删除恢复.对于这次的情况,只能通过文件系统级别进行恢复,不过该数据库表比较多,大概删除了几千个文件,而且文件系统是ext4,导致大量文件目录被置空,而且该库还运行了一段时间
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看来文件恢复删除这条路,基本上很难走得通,可以通过底层碎片技术恢复,通过底层扫描,找到不少碎片
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由于涉及的库表多,一个个处理太费时间,通过批量脚本直接解析扫描出来的碎片,并且对其进行入库处理
DBLOGIN=”-uroot ”
DICT_DBNAME=test
RECOVER_DBNAME=xifenfei
WORK_PATH=”/nfs_share/mysql-xff”
cd $WORK_PATH
>/tmp/recover_table_list.$RECOVER_DBNAME
>/tmp/recover_table_parser.$RECOVER_DBNAME
>/tmp/recover_table_unload.$RECOVER_DBNAME
rm -rf /tmp/recover_table_unload_$RECOVER_DBNAME.tmp
echo “tee /tmp/recover_table_unload_$RECOVER_DBNAME.tmp” >/tmp/recover_table_unload.$RECOVER_DBNAME
echo “SET @enable_trigger = 0;”>>/tmp/recover_table_unload.$RECOVER_DBNAME
echo “SET FOREIGN_KEY_CHECKS=0;” >>/tmp/recover_table_unload.$RECOVER_DBNAME
for TABLE_NAME_ID in `mysql $DBLOGIN $DICT_DBNAME -NBe “SELECT SYS_TABLES.NAME FROM SYS_TABLES LEFT JOIN SYS_INDEXES ON SYS_TABLES.ID = SYS_INDEXES.TABLE_ID WHERE SYS_INDEXES.NAME IN (‘PRIMARY’, ‘GENERAL_CLUSTERED_INDEX’) AND SYS_TABLES.NAME LIKE ‘${RECOVER_DBNAME}/%’”`
do
PKEY=`mysql $DBLOGIN $DICT_DBNAME -NBe “SELECT SYS_INDEXES.ID FROM SYS_TABLES LEFT JOIN SYS_INDEXES ON SYS_TABLES.ID = SYS_INDEXES.TABLE_ID WHERE SYS_INDEXES.NAME IN (‘PRIMARY’, ‘GENERAL_CLUSTERED_INDEX’) AND SYS_TABLES.NAME=’$TABLE_NAME_ID’”`
echo $TABLE_NAME_ID’,’$PKEY >>/tmp/recover_table_list.$RECOVER_DBNAME
TABLE_NAME=$(echo `echo $TABLE_NAME_ID`|awk -F”/” ‘{print $2}’ )
#echo $TABLE_NAME
PAGE=”pages-ibdata1/FIL_PAGE_INDEX/`printf ‘%016u’ ${PKEY}`.page”
echo “./c_parser -5f $PAGE -b pages-ibdata1/FIL_PAGE_TYPE_BLOB -t dictionary/$TABLE_NAME.sql > dumps/default/$TABLE_NAME 2> dumps/default/$TABLE_NAME.sql” >>/tmp/recover_table_parser.$RECOVER_DBNAME
echo “source dumps/default/$TABLE_NAME.sql” >>/tmp/recover_table_unload.$RECOVER_DBNAME
echo “select ‘$TABLE_NAME.sql……done’;”>>/tmp/recover_table_unload.$RECOVER_DBNAME
done
echo /tmp/recover_table_parser.$RECOVER_DBNAME
echo /tmp/recover_table_unload.$RECOVER_DBNAME
恢复之后数据整体入库,查询部分没有覆盖表,效果尚可,最大限度抢救了数据
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mysql ibd文件被加密恢复

又一起mysql的ibd文件被加密勒索的恢复请求
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通过分析,该文件只有部分被加密,理论上通过底层分析,可以恢复没有被破坏的部分数据
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通过处理恢复数据
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又一次证明,我们对于mysql文件被加密的勒索病毒,也可以实现较好恢复
如果是Innodb_file_per_table参数为false(5.6之前版本默认为false),需要通过ibdata文件进行恢复,Innodb_file_per_table如果为true,需要通过每个单独的ibd进行恢复.
如果您的数据库(oracle,mysql sql server)不幸被比特币加密,可以联系我们
Tel/微信:13429648788    Q Q:107644445 QQ咨询惜分飞    E-Mail:dba@xifenfei.com提供专业的解密恢复服务.

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MySQL勒索恢复

最近遇到几个mysql数据库被黑客删除库,并且留下比特币勒索信息在每个库的WARNING表中

mysql> desc WARNING
    -> ;
+-----------------+----------+------+-----+---------+-------+
| Field           | Type     | Null | Key | Default | Extra |
+-----------------+----------+------+-----+---------+-------+
| id              | int(11)  | YES  |     | NULL    |       |
| warning         | longtext | YES  |     | NULL    |       |
| Bitcoin_Address | longtext | YES  |     | NULL    |       |
| Email           | longtext | YES  |     | NULL    |       |
+-----------------+----------+------+-----+---------+-------+
4 rows in set (0.00 sec)

mysql> select * from WARNING;
+------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------+------------------+
| id   | warning                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | Bitcoin_Address                    | Email            |
+------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------+------------------+
|    1 | To recover your lost Database and avoid leaking it: Send us 0.06 Bitcoin (BTC) to our Bitcoin address 1BLYhUDmnmVPVjcTWgc6gFT6DCYwbVieUD and contact us by Email with your Server IP or Domain name and a Proof of Payment. If you are unsure if we have your data, contact us and we will send you a proof. Your Database is downloaded and backed up on our servers. Backups that we have right now: xxxx,xxxxxx,xxxxxxxx,xxxxxxx . If we dont receive your payment in the next 10 Days, we will make your database public or use them otherwise. | 1BLYhUDmnmVPVjcTWgc6gFT6DCYwbVieUD | contact@sqldb.to |
+------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------+------------------+
1 row in set (0.00 sec)

大概的意思就是:我们已经把你的数据库备份,您交给我们0.06个比特币,我们把数据给你,如果10天之内我们没有收到款,即将把数据库给公开或者作为其他用途.根据我们以往接触的朋友经验,付款之后数据库也不会给你(很可能黑客根本就没有备份数据库,只是删除了数据库然后勒索比特币.

对于这类情况,通过分析,确认黑客是删除了数据库,在没有覆盖的情况下,我们可以对其数据进行恢复,处理类似:MySQL drop database恢复(恢复方法同样适用MySQL drop table,delete,truncate table)最大限度缓解因为数据库被破坏带来的损失.
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如果您也遭遇到该问题,请保护现场,不要导入备份数据库,不要对数据所在分区进行写操作(现场保护的越好,数据恢复效果越好),对相关磁盘进行镜像,防止二次破坏.我们可以提供专业的mysql恢复服务,为您减少损失.

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