说明：本篇参考eygle老师的作品《Oracle DBA手记4：数据安全警示录》，特此表示感谢。
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Oracle Wallet是一种加密安全策略，过去我们在TDE（Oracle透明加密）部分研究过这个组件。简单的说，Oracle Wallet就是在本机上配置一个加密配置文件，通过SQL命令控制Oracle Wallet的开启关闭状态，如果Wallet关闭或者不存在，那么一些加密的信息（包括TDE和RMAN备份集合）数据就不能正常打开。
使用Oracle Wallet应用在RMAN备份中，可以实现类似的透明策略。而且，备份集合只能在相同的服务器（借助Wallet文件）才能正确打开。
首先，我们需要创建Oracle Wallet。注意：笔者使用的GI单实例ASM策略，监听器是从Grid里面执行的。
[oracle@NCR-Standby-Asm ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 08-JUN-2015 13:49:47
Copyright (c) 1991, 2013, Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.4.0 - Production
Start Date 25-MAY-2015 17:39:56
Uptime 13 days 20 hr. 9 min. 51 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/grid/product/11.2.0/grid/network/admin/listener.ora
Listener Log File /u01/app/grid/diag/tnslsnr/NCR-Standby-Asm/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM", status READY, has 1 handler(s) for this service...
Service "sicsstb" has 1 instance(s).
Instance "sicsstb", status READY, has 1 handler(s) for this service...
Service "sicsstbXDB" has 1 instance(s).
Instance "sicsstb", status READY, has 1 handler(s) for this service...
The command completed successfully
设置wallet目录位置，需要修改sqlnet.ora文件，加入特定的参数路径信息。注意：虽然监听器指向的是Grid目录位置。但是修改的sqlnet.ora文件，一定是Oracle Instance目录下的sqlnet.ora文件。否则自动创建秘钥文件过程会失败。
[oracle@NCR-Standby-Asm ~]$ cd $ORACLE_HOME/network/admin
[oracle@NCR-Standby-Asm admin]$ ls -l
total 24
drwxrwxr-x 2 oracle oinstall 4096 May 5 10:03 samples
-rwxrwxr-x 1 oracle oinstall 381 Dec 17 2012 shrept.lst
-rwxrwxr-x 1 oracle oinstall 327 Jun 8 15:32 sqlnet1506083PM3230.bak
-rwxrwxr-x 1 oracle oinstall 327 Jun 8 14:29 sqlnet.ora
-rwxrwxr-x 1 oracle oinstall 340 Jun 8 15:32 tnsnames1506083PM3230.bak
-rwxrwxr-x 1 oracle oinstall 340 Jun 8 16:19 tnsnames.ora
[oracle@NCR-Standby-Asm admin]$ cat sqlnet.ora
# Generated by Oracle configuration tools.
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
ENCRYPTION_WALLET_LOCATION=(SOURCE=(METHOD=FILE)(METHOD_DATA=(DIRECTORY=/u02/app/oracle/admin/sicsstb/WALLET)))
进入sqlplus创建wallet文件。
[oracle@NCR-Standby-Asm admin]$ sqlplus /nolog
SQL*Plus: Release 11.2.0.4.0 Production on Mon Jun 8 14:29:28 2015
Copyright (c) 1982, 2013, Oracle. All rights reserved.
SQL> conn / as sysdba
Connected.
SQL> alter system set encryption key authenticated by "test";
System altered.
确定wallet文件生成。
[oracle@NCR-Standby-Asm admin]$ pwd
/u02/app/oracle/product/11.2.0/dbhome_1/network/admin
[oracle@NCR-Standby-Asm admin]$ cd /u02/app/oracle/admin/sicsstb/WALLET
[oracle@NCR-Standby-Asm WALLET]$ ls -l
total 4
-rw-r--r-- 1 oracle asmadmin 2845 Jun 8 14:29 ewallet.p12
尝试关闭开启钱包操作。
SQL> alter system set encryption wallet close identified by "test";
System altered
SQL> alter system set encryption wallet open identified by "test"; --把wallet打开了
System altered
配置加密备份过程。
RMAN> configure encryption for database on;
new RMAN configuration parameters:
CONFIGURE ENCRYPTION FOR DATABASE ON;
new RMAN configuration parameters are successfully stored
RMAN> set encryption on;
executing command: SET encryption
备份数据库，注意此时wallet开启。
RMAN> backup database;
Starting backup at 08-JUN-15
using channel ORA_DISK_1
（篇幅原因，有省略……）
Starting Control File and SPFILE Autobackup at 08-JUN-15
piece handle=+RECO/sicsstb/autobackup/2015_06_08/s_881858264.262.881858265 comment=NONE
Finished Control File and SPFILE Autobackup at 08-JUN-15
备份操作是成功的，但是如果我们关闭了钱包，备份操作如何呢？
SQL> alter system set encryption wallet close identified by "test";
System altered
备份过程：
RMAN> backup database;
Starting backup at 08-JUN-15
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
（篇幅原因，有省略……）
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ORA_DISK_1 channel at 06/08/2015 16:39:38
ORA-19914: unable to encrypt backup
ORA-28365: wallet is not open
恢复过程测试。
RMAN> startup mount;
connected to target database (not started)
Oracle instance started
database mounted
Total System Global Area 1603411968 bytes
Fixed Size 2253664 bytes
Variable Size 1006636192 bytes
Database Buffers 587202560 bytes
Redo Buffers 7319552 bytes
RMAN> restore database;
Starting restore at 08-JUN-15
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=131 device type=DISK
（篇幅原因，有省略……）
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 06/08/2015 16:41:19
ORA-19870: error while restoring backup piece +RECO/sicsstb/backupset/2015_06_08/nnndf0_tag20150608t163709_0.261.881858229
ORA-19913: unable to decrypt backup
ORA-28365: wallet is not open
不开钱包，就不能进行还原。
SQL> alter system set encryption wallet open identified by "test";
System altered
RMAN> restore database;
Starting restore at 08-JUN-15
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile backup set restore
（篇幅原因，有省略…….）
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:35
Finished restore at 08-JUN-15
RMAN> recover database;
Starting recover at 08-JUN-15
using channel ORA_DISK_1
starting media recovery
media recovery complete, elapsed time: 00:00:01
Finished recover at 08-JUN-15
这种方式比较适合本地数据恢复，如果本地异地恢复结合的方式，建议使用第三种混合策略。
4、混合加密策略
混合加密策略其实就是前面两种策略的集合。如果本地备份恢复，就可以使用wallet进行透明操作。如果是异地恢复，可以使用密码策略。
首先设置encryption参数。
RMAN> set encryption off;
executing command: SET encryption
RMAN> set encryption on identified by "test"; --注意：此处没有only了。
executing command: SET encryption
重启还原。
RMAN> shutdown immediate;
database closed
database dismounted
Oracle instance shut down
RMAN> startup mount;
connected to target database (not started)
Oracle instance started
database mounted
Total System Global Area 1603411968 bytes
Fixed Size 2253664 bytes
Variable Size 1006636192 bytes
Database Buffers 587202560 bytes
Redo Buffers 7319552 bytes
RMAN> restore database;
Starting restore at 08-JUN-15
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=131 device type=DISK
channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00001 to +DATA/sicsstb/datafile/system.267.881856977
channel ORA_DISK_1: restoring datafile 00002 to +DATA/sicsstb/datafile/sysaux.268.881856977
channel ORA_DISK_1: restoring datafile 00003 to +DATA/sicsstb/datafile/undotbs1.269.881856977
channel ORA_DISK_1: restoring datafile 00004 to +DATA/sicsstb/datafile/users.270.881856977
channel ORA_DISK_1: reading from backup piece +RECO/sicsstb/backupset/2015_06_08/nnndf0_tag20150608t163709_0.261.881858229
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 06/08/2015 16:47:42
ORA-19870: error while restoring backup piece +RECO/sicsstb/backupset/2015_06_08/nnndf0_tag20150608t163709_0.261.881858229
ORA-19913: unable to decrypt backup
ORA-28365: wallet is not open
启动钱包。
SQL> alter system set encryption wallet open identified by "test";
System altered
之后恢复正常。
5、结论
安全是当今信息技术的一个大课题，需要从技术、管理、制度和人员多层面进行配置规划，设置标准的流程规范。
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