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SQLSERVER中怎么解密存儲過程

發布時間:2021-08-06 11:03:40 來源:億速云 閱讀:127 作者:Leah 欄目:數據庫

SQLSERVER中怎么解密存儲過程,很多新手對此不是很清楚,為了幫助大家解決這個難題,下面小編將為大家詳細講解,有這方面需求的人可以來學習下,希望你能有所收獲。

  加密測試的存儲過程

  IF EXISTS(SELECT 1 FROM SYSOBJECTS WHERE TYPE='P' AND NAME='P_TEST')

  DROP PROCEDURE P_TEST

  GO

  CREATE PROCEDURE P_TEST(@USERNAME VARCHAR(20),@MSG VARCHAR(20) OUTPUT)

  WITH ENCRYPTION

  AS

  BEGIN

  IF(SELECT COUNT(1) FROM Custs WHERE NAME=@USERNAME)>0

  SET @MSG='此用戶名存在'

  ELSE

  SET @MSG='此用戶名不存在'

  END

  解密的存儲過程

  Create PROCEDURE Decryption(@procedure sysname = NULL)

  AS

  SET NOCOUNT ON

  DECLARE @intProcSpace bigint, @t bigint, @maxColID smallint,@procNameLength int

  select @maxColID = max(subobjid) FROM

  sys.sysobjvalues WHERE objid = object_id(@procedure)

  --select @maxColID as 'Rows in sys.sysobjvalues'

  select @procNameLength = datalength(@procedure) + 29

  DECLARE @real_01 nvarchar(max)

  DECLARE @fake_01 nvarchar(max)

  DECLARE @fake_encrypt_01 nvarchar(max)

  DECLARE @real_decrypt_01 nvarchar(max),@real_decrypt_01a nvarchar(max)

  declare @objtype varchar(2),@ParentName nvarchar(max)

  select @real_decrypt_01a = ''

  --提取對象的類型如是存儲過程還是函數,如果是觸發器,還要得到其父對象的名稱

  select @objtype=type,@parentname=object_name(parent_object_id)

  from sys.objects where [object_id]=object_id(@procedure)

  -- 從sys.sysobjvalues里提出加密的imageval記錄

  SET @real_01=(SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid =

  object_id(@procedure) and valclass = 1 order by subobjid)

  --創建一個臨時表

  create table #output ( [ident] [int] IDENTITY (1, 1) NOT NULL ,

  [real_decrypt] NVARCHAR(MAX) )

  --開始一個事務,稍后回滾

  BEGIN TRAN

  --更改原始的存儲過程,用短橫線替換

  if @objtype='P'

  SET @fake_01='ALTER PROCEDURE '+ @procedure +' WITH ENCRYPTION AS select 1

  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'

  else if @objtype='FN'

  SET @fake_01='ALTER FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1

  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/ END'

  else if @objtype='V'

  SET @fake_01='ALTER view '+ @procedure +' WITH ENCRYPTION AS select 1 as col

  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'

  else if @objtype='TR'

  SET @fake_01='ALTER trigger '+ @procedure +' ON '+@parentname+'WITH ENCRYPTION AFTER INSERT AS RAISERROR (''N'',16,10)

  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'

  EXECUTE (@fake_01)

  --從sys.sysobjvalues里提出加密的假的

  SET @fake_encrypt_01=(SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid =

  object_id(@procedure) and valclass = 1 order by subobjid )

  if @objtype='P'

  SET @fake_01='Create PROCEDURE '+ @procedure +' WITH ENCRYPTION AS select 1

  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'

  else if @objtype='FN'

  SET @fake_01='CREATE FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1

  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/ END'

  else if @objtype='V'

  SET @fake_01='Create view '+ @procedure +' WITH ENCRYPTION AS select 1 as col

  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'

  else if @objtype='TR'

  SET @fake_01='Create trigger '+ @procedure +' ON '+@parentname+'WITH ENCRYPTION AFTER INSERT AS RAISERROR (''N'',16,10)

  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'

  --開始計數

  SET @intProcSpace=1

  --使用字符填充臨時變量

  SET @real_decrypt_01 = replicate(cast('A'as nvarchar(max)), (datalength(@real_01) /2 ))

  --循環設置每一個變量,創建真正的變量

  --每次一個字節

  SET @intProcSpace=1

  --如有必要,遍歷每個@real_xx變量并解密

  WHILE @intProcSpace<=(datalength(@real_01) begin="" set="" real_decrypt_01="" intprocspace="@intProcSpace+1" end="" insert="" output="" select="" --select="" real_decrypt="" as="" from="" --="" -------------------------------------="" declare="" dbname="" sysname="" blankspaceadded="0" int="" basepos="" currentpos="" textlength="" lineid="1" addonlen="" lfcr="2" definedlength="255" syscomtext="" line="" create="" table="" commenttext="" text="" collate="" sys.sysobjvalues="" ms_crs_syscom="" cursor="" local="" for="" order="" by="" ident="" read="" only="" open="" fetch="" next="" into="" while="" fetch_status="">= 0

  BEGIN

  SELECT @BasePos = 1

  SELECT @CurrentPos = 1

  SELECT @TextLength = LEN(@SyscomText)

  WHILE @CurrentPos != 0

  BEGIN

  --通過回車查找行的結束

  SELECT @CurrentPos = CHARINDEX(char(13)+char(10), @SyscomText,

  @BasePos)

  --如果找到回車

  IF @CurrentPos != 0

  BEGIN

  --如果@Lines的長度的新值比設置的大就插入@Lines目前的內容并繼續

  While (isnull(LEN(@Line),0) + @BlankSpaceAdded +

  @CurrentPos-@BasePos + @LFCR) > @DefinedLength

  BEGIN

  SELECT @AddOnLen = @DefinedLength-(isnull(LEN(@Line),0) +

  @BlankSpaceAdded)

  INSERT #CommentText VALUES

  ( @LineId,

  isnull(@Line, N'') + isnull(SUBSTRING(@SyscomText,

  @BasePos, @AddOnLen), N''))

  SELECT @Line = NULL, @LineId = @LineId + 1,

  @BasePos = @BasePos + @AddOnLen, @BlankSpaceAdded = 0

  END

  SELECT @Line = isnull(@Line, N'') +

  isnull(SUBSTRING(@SyscomText, @BasePos, @CurrentPos-@BasePos + @LFCR), N'')

  SELECT @BasePos = @CurrentPos+2

  INSERT #CommentText VALUES( @LineId, @Line )

  SELECT @LineId = @LineId + 1

  SELECT @Line = NULL

  END

  ELSE

  --如果回車沒找到

  BEGIN

  IF @BasePos <= 1="" textlength="" begin="" while="" blankspaceadded=""> @DefinedLength

  BEGIN

  SELECT @AddOnLen = @DefinedLength -

  (isnull(LEN(@Line),0) + @BlankSpaceAdded)

  INSERT #CommentText VALUES

  ( @LineId,

  isnull(@Line, N'') + isnull(SUBSTRING(@SyscomText,

  @BasePos, @AddOnLen), N''))

  SELECT @Line = NULL, @LineId = @LineId + 1,

  @BasePos = @BasePos + @AddOnLen, @BlankSpaceAdded =

  0

  END

  SELECT @Line = isnull(@Line, N'') +

  isnull(SUBSTRING(@SyscomText, @BasePos, @TextLength-@BasePos+1 ), N'')

  if LEN(@Line) < @DefinedLength and charindex(' ',   @SyscomText, @TextLength+1 ) > 0

  BEGIN

  SELECT @Line = @Line + ' ', @BlankSpaceAdded = 1

  END

  END

  END

  END

  FETCH NEXT FROM ms_crs_syscom into @SyscomText

  END

  IF @Line is NOT NULL

  INSERT #CommentText VALUES( @LineId, @Line )

  select Text from #CommentText order by LineId

  CLOSE ms_crs_syscom

  DEALLOCATE ms_crs_syscom

  DROP TABLE #CommentText

  -- -------------------------------------

  --結束從sp_helptext提取

  -- -------------------------------------

  --刪除用短橫線創建的存儲過程并重建原始的存儲過程

  ROLLBACK TRAN

  DROP TABLE #output

  GO

  啟用DAC

  SP_CONFIGURE 'remote admin connections';

  GO

  ----0:僅允許本地連接使用 DAC,1:允許遠程連接使用 DAC

  SP_CONFIGURE 'remote admin connections', 0;

  GO

  RECONFIGURE WITH OVERRIDE;

  GO

  文件——>新建——>數據庫引擎查詢

  服務器名稱:admin:.或者admin:服務器名稱

  登錄進去執行解密操作

  USE TEST

  EXEC Decryption P_TEST

  GO

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