Re: [mod-security-users] checking single parameter value

[joe b. <joe...@ya...>]

Thanks Alex 
  That worked as shown by these debug log messages
   
  Checking signature "^/mls_verifyemail.php" at REQUEST_URI
Checking against "/mls_verifyemail.php?hash=YmFyYmlzaDI="
Signature check returned 403
Chained rule with match, continue in the loop
Checking signature "^[0-9a-zA-Z]*" at ARG(hash)
Checking against "YmFyYmlzaDI="
Signature check returned -1
Access allowed based on pattern match "^[0-9a-zA-Z]*" at CUSTOM
Allow request to pass through
   
  But I am concerned by the  asterisk at the end of "^[0-9a-zA-Z]*" 
  Is that a wildcard meaning anything else is accepted like the = in the hash value?
   
  The hash value is created using this 
  $hash = base64_encode($logonid);
   
  Does base64_encode create any other special characters?
   
  Wouldn't "^[0-9a-zA-Z=]" be more secure?
  

"Alex V." <ale...@ss...> wrote:
  Sorry,

I think this should work :
SecFilterSelective REQUEST_URI "^/mls_verifyemail.php" chain
SecFilterSelective ARG_hash "^[0-9a-zA-Z]*" allow

(ARG_hash ans not ARGS_hash)

Alex

On Jeu 13 avril 2006 3:56, joe barbish a écrit :
> Hello list;
> In my debug log I see this:
>
> Normalised REQUEST_URI: /mls_verifyemail.php?hash=bGF5YmFja2ppbW15
> Parsing arguments...
> Adding parameter: [hash][bGF5YmFja2ppbW15]
> Checking signature "^/mls_verifyemail.php" at REQUEST_URI
> Checking against "/mls_verifyemail.php?hash=bGF5YmFja2ppbW15"
> Signature check returned -1
> Access allowed based on pattern match "^/mls_verifyemail.php" at
REQUEST_URI
>
> This is the rule which allows the above to pass
> SecFilterSelective REQUEST_URI "^/mls_verifyemail.php" allow
>
> I want to tighten this up by checking that there is only a single
> parameter value and that its a md5 hash with no bogus stuff inserted
> SecFilterSelective REQUEST_URI "^/mls_verifyemail.php" chain
SecFilterSelective QUERY_STRING "^?hash=" chain
> SecFilterSelective ARGS_VALUES "^hash=[0-9a-zA-Z]" allow
>
> This errors out. What am I doing wrong?
>
>
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