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Charles,--
With respect, I do understand the issue. I simply disagree with your assessment.
Gary
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles Wilt
Sent: Monday, August 01, 2011 11:48 AM
To: RPG programming on the IBM i / System i
Subject: Re: Reduce large amount of logicals in SUBFL pgm,take in
another direction
Gary,
I wouldn't call this a matter of disagreement ...
With respect, you obviously don't understand the issue....but it's an important issue. I'd be happy to clarify the problem, but I don't know any better way to explain it. Perhaps Scott, Joe or Jon can jump in with a better explanation.
Or perhaps you can explain why you think your code is safe because it's in a module...
You might start by posting the actual code, along with sample usage...
Perhaps then somebody will be able to give you a concrete example of how it could be misued.
Sincerely,
Charles
On Mon, Aug 1, 2011 at 2:25 PM, Monnier, Gary <Gary.Monnier@xxxxxxxxx> wrote:
Charles,--
So we choose to disagree.
Gary
-----Original Message-----
From: rpg400-l-bounces+gary.monnier=terex.com@xxxxxxxxxxxx
[mailto:rpg400-l-bounces+gary.monnier=terex.com@xxxxxxxxxxxx] On
Behalf Of Charles Wilt
Sent: Monday, August 01, 2011 11:19 AM
To: RPG programming on the IBM i / System i
Subject: Re: Reduce large amount of logicals in SUBFL pgm,take in
another direction
Gary,
You seem to be hung up on *MODULE...
I repeat, it doesn't matter where the statement is built. If you're building a statement dynamically with concatenation of user supplied string. The code is vulnerable. It doesn't have anything to do with *PGM, *MODULE, *SRVPGM, authority or debug mode.
Charles
On Mon, Aug 1, 2011 at 1:54 PM, Monnier, Gary <Gary.Monnier@xxxxxxxxx> wrote:
Charles,--
With respect you seem to be hung up on my example being a *PGM. I recommended *MODULE. If you feel someone can get to a *PGM build from *MODULEs and can inject an SQL statement then again I assert security settings to the program are set incorrectly. Either you allow *PUBLIC to debug the program or you have had a security breach involving a profile with enough authority to debug the program. If the executable *PGM allows modules and or service programs to be changed then you also have a security hole. In both cases it is not my example causing the breach and other much larger security issues are in play.
Respectfully,
Gary Monnier
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles Wilt
Sent: Monday, August 01, 2011 6:06 AM
To: RPG programming on the IBM i / System i
Subject: Re: Reduce large amount of logicals in SUBFL pgm,take in
another direction
Gary,
If you think that your program doesn't open you up to SQL injection, you are sadly mistaken...
The fact that the procedure is bound statically by reference or by copy as opposed to a dynamic called *PGM has no bearing.
SQL injection attacks can occur anytime you dynamically build a statement and concatenate user string input into the statement. It doesn't matter where the statement is built.
Again, all that matters is that in some way shape or form, you are building a statement like so:
wSqlStmt = 'SELECT * FROM MYTABLE WHERE MYFLD = ' +
userEnteredValue;
Theoretically, you could parse and sanitize the user input, making
sure it's safe before using it. However, unlike some languages RPG
doesn't have that functionality built in. Also, IMHO you're
dependent on the guy who wrote the sanitizer being smarter than the
hackers :)
The safe way to do dynamic statements is via parameter markers. You build a statement like so:
wSqlStmt = 'SELECT * FROM MYTABLE WHERE MYFLD = ?';
then when you open/execute it, you pass in the variables to use at the parameter markers.
open C1 using :userEnteredValue;
With respect to PCI requirements...
6.5 Develop applications based on secure coding guidelines and review custom application code to identify coding vulnerabilities. Follow up-to-date industry best practices to identify and manage vulnerabilities.
OWASP is one of the standards usually used for secure coding...their top security risk for 2010...injection (SQL queries, LDAP queries, XPath queries, OS commands, program arguments, etc. ).
https://www.owasp.org/index.php/Category:OWASP_Top_Ten_Project
Thus, dynamic SQL as used by your programs would fail an secure code review and you'd likely fail a PCI audit.
HTH,
Charles
On Fri, Jul 29, 2011 at 2:26 PM, Monnier, Gary <Gary.Monnier@xxxxxxxxx> wrote:
Your opinion Charles and what seems a very strong opinion. J--
Yes, I've heard of SQL Injection attacks and no my suggestion does
not leave you open to this sort of attack. I've also heard of LDAP
injection attacks.
What I suggested does not impact PCI compliance or any other
security parameters. Nor does it impact FDA compliance. All the
MODULE does is build an SQL string. When bound with other modules
to make an executable object there are no compliance issues.
If you create ILE programs that allow updating modules or service
programs then you have a behavior that needs changing. My opinion
is, and it is only my opinion, you should NEVER create a program
with Allow update. You are just asking for trouble in the ILE world.
If you have ulcer causing issues with pgmToBuildSQL make it a copy
module rather than a bound module.
Regards,
Gary
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles Wilt
Sent: Friday, July 29, 2011 10:35 AM
To: RPG programming on the IBM i / System i
Subject: Re: Reduce large amount of logicals in SUBFL pgm,take in
another direction
Very, very BAD IDEA!
Horrible in fact.
I hope you're not subject to PCI compliance rules, as the code you
posted pretty much guarantees an automatic failure.
Try googleing for "SQL injection"...
Charles
On Fri, Jul 29, 2011 at 1:16 PM, Monnier, Gary
<Gary.Monnier@xxxxxxxxx <mailto:Gary.Monnier@xxxxxxxxx> > wrote:
Sharon,
The process that builds your SQL statement can have parameters
passed
to it. One of these parameters can be a list of selections.
Something like this.
pgmToBuildSQL PR
nbrFieldsForWhereClause
arrayOfFieldsForWhereClause
arrayOfValuesForWhereClause
SQLStringBegin = 'Select * From yourfile ';
X = 1;
startPos = 1;
doW (X < = nbrFieldsForWhereClause);
whereValue = arrayOfFieldsForWhereClause(X) +
arrayOfValuesForWhereClause(X); //ValueFor can be = value, like
value, etc
valueLen = %len(%trimr(whereValue));
%subst(whereClause:startPos:valueLen) = whereValue;
startpos = startPos + valueLen + 1;
X = X + 1;
enddo;
Return;
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