[nycphp-talk] Is it safe to log unsanitized, unvalidated user-inputted data into a logfile?
justin at justinhileman.info
Wed Apr 8 18:09:17 EDT 2009
Konstantin Rozinov wrote:
>> it's ok to receive garbage. Just don't send garbage. This leads me
>> back to the OP's question of "do I need to validate user input that is
>> written to a log file?". The answer is no but you do need to escape
>> (or rather remove, truncate or flatten) anything that you don't want
>> to end up being read by a program that reads log files like passwords
>> and excessively long messages that might fill up the disk or prevent
>> someone from viewing the log.
> Mike brings up a good point about truncating excessively long
> user-inputted strings when logging them.
> I'm currently using something like this:
> if (strlen($msg)> ProjectConstants::LOG_MESSAGE_MAX_LENGTH)
> $msg = substr($msg, 0, ProjectConstants::LOG_MESSAGE_MAX_LENGTH);
> $msg .= '...';
> Any suggestions or ideas?
I generally use this method for truncating strings (breaks on word
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