Protection against SQL Injection Attack 
July 19th, 2006, 01:10 PM
|  | Expert | | Join Date: Jun 2006 Location: Seremban, Malaysia Age: 33
Posts: 1,630
| |  Protection against SQL Injection Attack
hi everyone,
Below is a simple function that will give you some protection against an SQL Injection attempt.
what is SQL injection?
SQL injection is a security vulnerability that occurs in the database layer of an application. Its source is the incorrect escaping of variables embedded in SQL statements. It is in fact an instance of a more general class of vulnerabilities that can occur whenever one programming or scripting language is embedded inside another. -
'Function IllegalChars to guard against SQL injection
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Function IllegalChars(sInput)
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'Declare variables
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Dim sBadChars, iCounter
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'Set IllegalChars to False
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IllegalChars=False
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'Create an array of illegal characters and words
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sBadChars=array("select", "drop", ";", "--", "insert", "delete", "xp_", _
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"#", "%", "&", "'", "(", ")", "/", "\", ":", ";", "<", ">", "=", "[", "]", "?", "`", "|")
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'Loop through array sBadChars using our counter & UBound function
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For iCounter = 0 to uBound(sBadChars)
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'Use Function Instr to check presence of illegal character in our variable
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If Instr(sInput,sBadChars(iCounter))>0 Then
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IllegalChars=True
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End If
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Next
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End function
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sample usage.. -
<%
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'Declare variables
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Dim sUsername, sPassword
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'retrieve our form textbox values and assign to variables
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sUsername=Request.Form("txtUsername")
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sPassword=Request.Form("txtPassword")
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'Call the function IllegalChars to check for illegal characters
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If IllegalChars(sUsername)=True OR IllegalChars(sPassword)=True Then
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Response.redirect("no_access.asp")
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End If
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%>
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June 18th, 2007, 02:02 AM
| | Newbie | | Join Date: Jun 2007
Posts: 1
| |
Quote: |
Originally Posted by sashi hi everyone,
Below is a simple function that will give you some protection against an SQL Injection attempt.
what is SQL injection?
SQL injection is a security vulnerability that occurs in the database layer of an application. Its source is the incorrect escaping of variables embedded in SQL statements. It is in fact an instance of a more general class of vulnerabilities that can occur whenever one programming or scripting language is embedded inside another. -
'Function IllegalChars to guard against SQL injection
-
Function IllegalChars(sInput)
-
'Declare variables
-
Dim sBadChars, iCounter
-
'Set IllegalChars to False
-
IllegalChars=False
-
'Create an array of illegal characters and words
-
sBadChars=array("select", "drop", ";", "--", "insert", "delete", "xp_", _
-
"#", "%", "&", "'", "(", ")", "/", "\", ":", ";", "<", ">", "=", "[", "]", "?", "`", "|")
-
'Loop through array sBadChars using our counter & UBound function
-
For iCounter = 0 to uBound(sBadChars)
-
'Use Function Instr to check presence of illegal character in our variable
-
If Instr(sInput,sBadChars(iCounter))>0 Then
-
IllegalChars=True
-
End If
-
Next
-
End function
-
sample usage.. -
<%
-
'Declare variables
-
Dim sUsername, sPassword
-
'retrieve our form textbox values and assign to variables
-
sUsername=Request.Form("txtUsername")
-
sPassword=Request.Form("txtPassword")
-
-
'Call the function IllegalChars to check for illegal characters
-
If IllegalChars(sUsername)=True OR IllegalChars(sPassword)=True Then
-
Response.redirect("no_access.asp")
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End If
-
%>
-
|
could you please be more detailed? i mean just write php code please?
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August 7th, 2008, 02:58 PM
| | Newbie | | Join Date: Aug 2008
Posts: 1
| |
Here's a very light ASP function to help protect against these attacks. ASP sql injection prevention |  |
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