hi,
I'm using taint mode and would like to taint valid usernames and passwords. basically i'm not sure what to allow and what not to allow. Should passwords only allow alphabetical and numerical characters? or can a password be "This_is-my|pass,,word" I'll be storing the password in a MD5 hash in mysql db that field is VARCHAR(16). So If i was to do a regex for the password input from the user, would I allow just alphabetical and numerical characters? If yes is this the proper regex/taint method: 
$user_pass = $INPUT->param{'pass'};
if ($user_pass =~ /^[A-Za-z0-9]+$/ && length($user_pass) < 17) {
$user_pass = $1;
}

[download]
Are there any implications to what I'm trying to do? I'm not to strict with password rules too, the only one I have is for the members password to be 6 charcters or longer.

What about the username? If I want to allow a username like "Perl_Monks" how can I make the proper regex for it? Is the "_" or underscore character part of the A-Za-z0-9 patter?

Or am I worrying about this issue too much? Basically I want to secure the script as much as possible so no one can enter any unwanted input to my script.

ty
tanger

In reply to Regex usernames and Passwords by tanger

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