Gurusamy Sarathy > libwin32-0.191 > Win32::FileSecurity

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Module Version: 1.04   Source  

NAME ^

Win32::FileSecurity - manage FileSecurity Discretionary Access Control Lists in perl

SYNOPSIS ^

        use Win32::FileSecurity;

DESCRIPTION ^

This module offers control over the administration of system FileSecurity DACLs. You may want to use Get and EnumerateRights to get an idea of what mask values correspond to what rights as viewed from File Manager.

CONSTANTS ^

  DELETE, READ_CONTROL, WRITE_DAC, WRITE_OWNER,
  SYNCHRONIZE, STANDARD_RIGHTS_REQUIRED, 
  STANDARD_RIGHTS_READ, STANDARD_RIGHTS_WRITE,
  STANDARD_RIGHTS_EXECUTE, STANDARD_RIGHTS_ALL,
  SPECIFIC_RIGHTS_ALL, ACCESS_SYSTEM_SECURITY, 
  MAXIMUM_ALLOWED, GENERIC_READ, GENERIC_WRITE,
  GENERIC_EXECUTE, GENERIC_ALL, F, FULL, R, READ,
  C, CHANGE

FUNCTIONS ^

NOTE:

All of the functions return false if they fail, unless otherwise noted. Errors returned via $! containing both Win32 GetLastError() and a text message indicating Win32 function that failed.

constant( $name, $set )

Stores the value of named constant $name into $set. Same as $set = Win32::FileSecurity::NAME_OF_CONSTANT();.

Get( $filename, \%permisshash )

Gets the DACLs of a file or directory.

Set( $filename, \%permisshash )

Sets the DACL for a file or directory.

EnumerateRights( $mask, \@rightslist )

Turns the bitmask in $mask into a list of strings in @rightslist.

MakeMask( qw( DELETE READ_CONTROL ) )

Takes a list of strings representing constants and returns a bitmasked integer value.

%permisshash

Entries take the form $permisshash{USERNAME} = $mask ;

EXAMPLE1 ^

    # Gets the rights for all files listed on the command line.
    use Win32::FileSecurity qw(Get EnumerateRights);
    
    foreach( @ARGV ) {
        next unless -e $_ ;
        if ( Get( $_, \%hash ) ) {
            while( ($name, $mask) = each %hash ) {
                print "$name:\n\t"; 
                EnumerateRights( $mask, \@happy ) ;
                print join( "\n\t", @happy ), "\n";
            }
        }
        else {
            print( "Error #", int( $! ), ": $!" ) ;
        }
    }

EXAMPLE2 ^

    # Gets existing DACL and modifies Administrator rights
    use Win32::FileSecurity qw(MakeMask Get Set);
    
    # These masks show up as Full Control in File Manager
    $file = MakeMask( qw( FULL ) );
    
    $dir = MakeMask( qw(
            FULL
        GENERIC_ALL
    ) );
    
    foreach( @ARGV ) {
        s/\\$//;
        next unless -e;
        Get( $_, \%hash ) ;
        $hash{Administrator} = ( -d ) ? $dir : $file ;
        Set( $_, \%hash ) ;
    }

COMMON MASKS FROM CACLS AND WINFILE ^

READ

        MakeMask( qw( FULL ) ); # for files
        MakeMask( qw( READ GENERIC_READ GENERIC_EXECUTE ) ); # for directories

CHANGE

        MakeMask( qw( CHANGE ) ); # for files
        MakeMask( qw( CHANGE GENERIC_WRITE GENERIC_READ GENERIC_EXECUTE ) ); # for directories

ADD & READ

        MakeMask( qw( ADD GENERIC_READ GENERIC_EXECUTE ) ); # for directories only!

FULL

        MakeMask( qw( FULL ) ); # for files
        MakeMask( qw( FULL  GENERIC_ALL ) ); # for directories

RESOURCES ^

From Microsoft: check_sd http://premium.microsoft.com/download/msdn/samples/2760.exe

(thanks to Guert Schimmel at Sybase for turning me on to this one)

VERSION ^

1.03 ALPHA 97-12-14

REVISION NOTES ^

1.03 ALPHA 1998.01.11

Imported diffs from 0.67 (parent) version

1.02 ALPHA 1997.12.14

Pod fixes, @EXPORT list additions <gsar@activestate.com>

Fix unitialized vars on unknown ACLs <jmk@exc.bybyte.de>

1.01 ALPHA 1997.04.25

CORE Win32 version imported from 0.66 <gsar@activestate.com>

0.67 ALPHA 1997.07.07

Kludged bug in mapping bits to separate ACE's. Notably, this screwed up CHANGE access by leaving out a delete bit in the INHERIT_ONLY_ACE | OBJECT_INHERIT_ACE Access Control Entry.

May need to rethink...

0.66 ALPHA 1997.03.13

Fixed bug in memory allocation check

0.65 ALPHA 1997.02.25

Tested with 5.003 build 303

Added ISA exporter, and @EXPORT_OK

Added F, FULL, R, READ, C, CHANGE as composite pre-built mask names.

Added server\ to keys returned in hash from Get

Made constants and MakeMask case insensitive (I don't know why I did that)

Fixed mask comparison in ListDacl and Enumerate Rights from simple & mask to exact bit match ! ( ( x & y ) ^ x ) makes sure all bits in x are set in y

Fixed some "wild" pointers

0.60 ALPHA 1996.07.31

Now suitable for file and directory permissions

Included ListDacl.exe in bundle for debugging

Added "intuitive" inheritance for directories, basically functions like FM triggered by presence of GENERIC_ rights this may need to change

see EXAMPLE2

Changed from AddAccessAllowedAce to AddAce for control over inheritance

0.51 ALPHA 1996.07.20

Fixed memory allocation bug

0.50 ALPHA 1996.07.29

Base functionality

Using AddAccessAllowedAce

Suitable for file permissions

KNOWN ISSUES / BUGS ^

  1. May not work on remote drives.
  2. Errors croak, don't return via $! as documented.
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