java qr code reader open source will generate an error, since the $file variable has come from an external source in Objective-C

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Using pipes is also an insecure option if the command or data you are using with a command has come from an external source Therefore,
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$file = shift; open(FOO,"gunzip -c $file|");
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is considered unsafe, since you must call a shell in order to interpret the entire command line You can get around this by using the alternative pipe notation,
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$file = shift; open(FOO,"-|") or exec 'gunzip', '-c', $file; PROGRAMMING WITH PERL
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which is considered safe, because you do not use a shell to execute the command To switch on taint checking, you must specify the -T option on the command line This works for Unix and Windows NT Taint checking with MacPerl is not strictly available, and even if it were, it wouldn t make a huge difference since the Mac OS is not capable of executing external programs In any case, it is not prone to the same security breaches as a Unix or NT system Taint checking is also automatically enabled by Perl if you attempt to run a script that is running with different real and effective user and group IDs If the setuid or setgid bit has been set on a Unix system, this automatically implies taint checking Once switched on, taint checking is enabled for the rest of your script; you cannot switch it off until the script ends To detect whether a variable is tainted, you can use the function is_tainted from the taintedpl script supplied in the standard library of the Perl distribution The only way to untaint variables is to reference substring regular expression matches For example, for an email address, you might use the following code fragment to extract an untainted version of the address:
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If ($addr =~ /^([-\@\w]+)$/) { $addr = $1; } else { die "Bad email address"; }
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Obviously, running an expression match on every tainted element defeats the object of taint checking in the first place You can switch this untainting behavior off by using the re pragma,
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Perl: The Complete Reference
use re 'taint';
which means that all regular expressions taint data if their source data is already tainted Because variables from CGI scripts are tainted (they come from either an external environment variable or the standard input), tainting Perl CGI scripts is a good idea
The Safe and Opcode Modules
The Safe module makes use of Perl s ability to run code within a separate compartment Normally this is done via the eval function The difference with the Safe module is that the compartment can be configured to allow only certain internal Perl functions to execute This allows you to disable or enable functions that you want to allow or prevent the use of in the script you want to execute The new compartment is completely restrictive You cannot access subroutines or variables outside of the compartment, regardless of the methods you try to use In fact, the only variables that are shared between the main script and the safe compartment are $_, @_, %_, and the _ special filehandle You can place variables into the compartment for the main script if you need to The method for creating the new compartment is to create a new Safe object and then, optionally, create a new opcode mask that limits the list of available opcodes that form the basis of any Perl script (see s 16 and 17):
$safe = new Safe;
You can create a new name space to use for the new compartment by specifying it as an argument:
$safe = new Safe("Compartment");
By default, the value is Safe::Root0, and it is incremented for each new compartment created within the scope of the current script There are five main methods for controlling the compartment once it has been created:
$safe = new Safe; $safe->permit(OP,); $safe->permit_only(OP,); $safe->deny(OP,); $safe->deny_only(OP,); $safe->share(NAME,);
The permit and deny methods add opcodes to the lists of allowed and restricted opcodes for the new compartment, respectively Thus, additional calls to these
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