safetk.tcl
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- # safetk.tcl --
- #
- # Support procs to use Tk in safe interpreters.
- #
- # RCS: @(#) $Id: safetk.tcl,v 1.8.8.1 2006/01/25 18:21:41 dgp Exp $
- #
- # Copyright (c) 1997 Sun Microsystems, Inc.
- #
- # See the file "license.terms" for information on usage and redistribution
- # of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- # see safetk.n for documentation
- #
- #
- # Note: It is now ok to let untrusted code being executed
- # between the creation of the interp and the actual loading
- # of Tk in that interp because the C side Tk_Init will
- # now look up the master interp and ask its safe::TkInit
- # for the actual parameters to use for it's initialization (if allowed),
- # not relying on the slave state.
- #
- # We use opt (optional arguments parsing)
- package require opt 0.4.1;
- namespace eval ::safe {
- # counter for safe toplevels
- variable tkSafeId 0;
- #
- # tkInterpInit : prepare the slave interpreter for tk loading
- # most of the real job is done by loadTk
- # returns the slave name (tkInterpInit does)
- #
- proc ::safe::tkInterpInit {slave argv} {
- global env tk_library
- # We have to make sure that the tk_library variable uses a file
- # pathname that works better in Tk (of the style returned by
- # [file join], ie C:/path/to/tk/lib, not C:pathtotklib
- set tk_library [file join $tk_library]
- # Clear Tk's access for that interp (path).
- allowTk $slave $argv
- # there seems to be an obscure case where the tk_library
- # variable value is changed to point to a sym link destination
- # dir instead of the sym link itself, and thus where the $tk_library
- # would then not be anymore one of the auto_path dir, so we use
- # the addToAccessPath which adds if it's not already in instead
- # of the more conventional findInAccessPath.
- # Might be usefull for masters without Tk really loaded too.
- ::interp eval $slave [list set tk_library [::safe::interpAddToAccessPath $slave $tk_library]]
- return $slave
- }
- # tkInterpLoadTk :
- # Do additional configuration as needed (calling tkInterpInit)
- # and actually load Tk into the slave.
- #
- # Either contained in the specified windowId (-use) or
- # creating a decorated toplevel for it.
- # empty definition for auto_mkIndex
- proc ::safe::loadTk {} {}
-
- ::tcl::OptProc loadTk {
- {slave -interp "name of the slave interpreter"}
- {-use -windowId {} "window Id to use (new toplevel otherwise)"}
- {-display -displayName {} "display name to use (current one otherwise)"}
- } {
- set displayGiven [::tcl::OptProcArgGiven "-display"]
- if {!$displayGiven} {
-
- # Try to get the current display from "."
- # (which might not exist if the master is tk-less)
-
- if {[catch {set display [winfo screen .]}]} {
- if {[info exists ::env(DISPLAY)]} {
- set display $::env(DISPLAY)
- } else {
- Log $slave "no winfo screen . nor env(DISPLAY)" WARNING
- set display ":0.0"
- }
- }
- }
- if {![::tcl::OptProcArgGiven "-use"]} {
-
- # create a decorated toplevel
-
- ::tcl::Lassign [tkTopLevel $slave $display] w use
- # set our delete hook (slave arg is added by interpDelete)
- # to clean up both window related code and tkInit(slave)
- Set [DeleteHookName $slave] [list tkDelete {} $w]
- } else {
- # set our delete hook (slave arg is added by interpDelete)
- # to clean up tkInit(slave)
-
- Set [DeleteHookName $slave] [list disallowTk]
- # Let's be nice and also accept tk window names instead of ids
-
- if {[string match ".*" $use]} {
- set windowName $use
- set use [winfo id $windowName]
- set nDisplay [winfo screen $windowName]
- } else {
- # Check for a better -display value
- # (works only for multi screens on single host, but not
- # cross hosts, for that a tk window name would be better
- # but embeding is also usefull for non tk names)
-
- if {![catch {winfo pathname $use} name]} {
- set nDisplay [winfo screen $name]
- } else {
- # Can't have a better one
-
- set nDisplay $display
- }
- }
- if {$nDisplay ne $display} {
- if {$displayGiven} {
- error "conflicting -display $display and -use
- $use -> $nDisplay"
- } else {
- set display $nDisplay
- }
- }
- }
- # Prepares the slave for tk with those parameters
-
- tkInterpInit $slave [list "-use" $use "-display" $display]
-
- load {} Tk $slave
- return $slave
- }
- proc ::safe::TkInit {interpPath} {
- variable tkInit
- if {[info exists tkInit($interpPath)]} {
- set value $tkInit($interpPath)
- Log $interpPath "TkInit called, returning "$value"" NOTICE
- return $value
- } else {
- Log $interpPath "TkInit called for interp with clearance:
- preventing Tk init" ERROR
- error "not allowed"
- }
- }
- # safe::allowTk --
- #
- # Set tkInit(interpPath) to allow Tk to be initialized in
- # safe::TkInit.
- #
- # Arguments:
- # interpPath slave interpreter handle
- # argv arguments passed to safe::TkInterpInit
- #
- # Results:
- # none.
- proc ::safe::allowTk {interpPath argv} {
- variable tkInit
- set tkInit($interpPath) $argv
- return
- }
- # safe::disallowTk --
- #
- # Unset tkInit(interpPath) to disallow Tk from getting initialized
- # in safe::TkInit.
- #
- # Arguments:
- # interpPath slave interpreter handle
- #
- # Results:
- # none.
- proc ::safe::disallowTk {interpPath} {
- variable tkInit
- # This can already be deleted by the DeleteHook of the interp
- if {[info exists tkInit($interpPath)]} {
- unset tkInit($interpPath)
- }
- return
- }
- # safe::tkDelete --
- #
- # Clean up the window associated with the interp being deleted.
- #
- # Arguments:
- # interpPath slave interpreter handle
- #
- # Results:
- # none.
- proc ::safe::tkDelete {W window slave} {
- # we are going to be called for each widget... skip untill it's
- # top level
- Log $slave "Called tkDelete $W $window" NOTICE
- if {[::interp exists $slave]} {
- if {[catch {::safe::interpDelete $slave} msg]} {
- Log $slave "Deletion error : $msg"
- }
- }
- if {[winfo exists $window]} {
- Log $slave "Destroy toplevel $window" NOTICE
- destroy $window
- }
-
- # clean up tkInit(slave)
- disallowTk $slave
- return
- }
- proc ::safe::tkTopLevel {slave display} {
- variable tkSafeId
- incr tkSafeId
- set w ".safe$tkSafeId"
- if {[catch {toplevel $w -screen $display -class SafeTk} msg]} {
- return -code error "Unable to create toplevel for
- safe slave "$slave" ($msg)"
- }
- Log $slave "New toplevel $w" NOTICE
- set msg "Untrusted Tcl applet ($slave)"
- wm title $w $msg
- # Control frame
- set wc $w.fc
- frame $wc -bg red -borderwidth 3 -relief ridge
- # We will destroy the interp when the window is destroyed
- bindtags $wc [concat Safe$wc [bindtags $wc]]
- bind Safe$wc <Destroy> [list ::safe::tkDelete %W $w $slave]
- label $wc.l -text $msg -padx 2 -pady 0 -anchor w
- # We want the button to be the last visible item
- # (so be packed first) and at the right and not resizing horizontally
- # frame the button so it does not expand horizontally
- # but still have the default background instead of red one from the parent
- frame $wc.fb -bd 0
- button $wc.fb.b -text "Delete"
- -bd 1 -padx 2 -pady 0 -highlightthickness 0
- -command [list ::safe::tkDelete $w $w $slave]
- pack $wc.fb.b -side right -fill both
- pack $wc.fb -side right -fill both -expand 1
- pack $wc.l -side left -fill both -expand 1
- pack $wc -side bottom -fill x
- # Container frame
- frame $w.c -container 1
- pack $w.c -fill both -expand 1
-
- # return both the toplevel window name and the id to use for embedding
- list $w [winfo id $w.c]
- }
- }