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263 lines
7.2 KiB
263 lines
7.2 KiB
4 years ago
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# safetk.tcl --
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#
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# Support procs to use Tk in safe interpreters.
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#
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# Copyright (c) 1997 Sun Microsystems, Inc.
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#
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# See the file "license.terms" for information on usage and redistribution
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# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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# see safetk.n for documentation
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#
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#
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# Note: It is now ok to let untrusted code being executed
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# between the creation of the interp and the actual loading
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# of Tk in that interp because the C side Tk_Init will
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# now look up the master interp and ask its safe::TkInit
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# for the actual parameters to use for it's initialization (if allowed),
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# not relying on the slave state.
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#
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# We use opt (optional arguments parsing)
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package require opt 0.4.1;
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namespace eval ::safe {
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# counter for safe toplevels
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variable tkSafeId 0
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}
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#
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# tkInterpInit : prepare the slave interpreter for tk loading
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# most of the real job is done by loadTk
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# returns the slave name (tkInterpInit does)
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#
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proc ::safe::tkInterpInit {slave argv} {
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global env tk_library
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# We have to make sure that the tk_library variable is normalized.
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set tk_library [file normalize $tk_library]
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# Clear Tk's access for that interp (path).
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allowTk $slave $argv
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# Ensure tk_library and subdirs (eg, ttk) are on the access path
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::interp eval $slave [list set tk_library [::safe::interpAddToAccessPath $slave $tk_library]]
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foreach subdir [::safe::AddSubDirs [list $tk_library]] {
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::safe::interpAddToAccessPath $slave $subdir
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}
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return $slave
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}
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# tkInterpLoadTk:
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# Do additional configuration as needed (calling tkInterpInit)
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# and actually load Tk into the slave.
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#
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# Either contained in the specified windowId (-use) or
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# creating a decorated toplevel for it.
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# empty definition for auto_mkIndex
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proc ::safe::loadTk {} {}
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::tcl::OptProc ::safe::loadTk {
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{slave -interp "name of the slave interpreter"}
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{-use -windowId {} "window Id to use (new toplevel otherwise)"}
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{-display -displayName {} "display name to use (current one otherwise)"}
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} {
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set displayGiven [::tcl::OptProcArgGiven "-display"]
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if {!$displayGiven} {
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# Try to get the current display from "."
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# (which might not exist if the master is tk-less)
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if {[catch {set display [winfo screen .]}]} {
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if {[info exists ::env(DISPLAY)]} {
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set display $::env(DISPLAY)
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} else {
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Log $slave "no winfo screen . nor env(DISPLAY)" WARNING
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set display ":0.0"
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}
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}
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}
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# Get state for access to the cleanupHook.
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namespace upvar ::safe S$slave state
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if {![::tcl::OptProcArgGiven "-use"]} {
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# create a decorated toplevel
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lassign [tkTopLevel $slave $display] w use
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# set our delete hook (slave arg is added by interpDelete)
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# to clean up both window related code and tkInit(slave)
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set state(cleanupHook) [list tkDelete {} $w]
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} else {
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# set our delete hook (slave arg is added by interpDelete)
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# to clean up tkInit(slave)
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set state(cleanupHook) [list disallowTk]
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# Let's be nice and also accept tk window names instead of ids
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if {[string match ".*" $use]} {
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set windowName $use
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set use [winfo id $windowName]
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set nDisplay [winfo screen $windowName]
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} else {
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# Check for a better -display value
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# (works only for multi screens on single host, but not
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# cross hosts, for that a tk window name would be better
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# but embeding is also usefull for non tk names)
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if {![catch {winfo pathname $use} name]} {
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set nDisplay [winfo screen $name]
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} else {
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# Can't have a better one
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set nDisplay $display
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}
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}
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if {$nDisplay ne $display} {
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if {$displayGiven} {
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return -code error -errorcode {TK DISPLAY SAFE} \
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"conflicting -display $display and -use $use -> $nDisplay"
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} else {
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set display $nDisplay
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}
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}
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}
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# Prepares the slave for tk with those parameters
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tkInterpInit $slave [list "-use" $use "-display" $display]
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load {} Tk $slave
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return $slave
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}
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proc ::safe::TkInit {interpPath} {
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variable tkInit
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if {[info exists tkInit($interpPath)]} {
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set value $tkInit($interpPath)
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Log $interpPath "TkInit called, returning \"$value\"" NOTICE
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return $value
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} else {
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Log $interpPath "TkInit called for interp with clearance:\
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preventing Tk init" ERROR
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return -code error -errorcode {TK SAFE PERMISSION} "not allowed"
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}
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}
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# safe::allowTk --
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#
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# Set tkInit(interpPath) to allow Tk to be initialized in
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# safe::TkInit.
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#
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# Arguments:
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# interpPath slave interpreter handle
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# argv arguments passed to safe::TkInterpInit
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#
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# Results:
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# none.
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proc ::safe::allowTk {interpPath argv} {
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variable tkInit
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set tkInit($interpPath) $argv
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return
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}
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# safe::disallowTk --
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#
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# Unset tkInit(interpPath) to disallow Tk from getting initialized
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# in safe::TkInit.
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#
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# Arguments:
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# interpPath slave interpreter handle
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#
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# Results:
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# none.
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proc ::safe::disallowTk {interpPath} {
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variable tkInit
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# This can already be deleted by the DeleteHook of the interp
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if {[info exists tkInit($interpPath)]} {
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unset tkInit($interpPath)
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}
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return
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}
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# safe::tkDelete --
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#
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# Clean up the window associated with the interp being deleted.
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#
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# Arguments:
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# interpPath slave interpreter handle
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#
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# Results:
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# none.
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proc ::safe::tkDelete {W window slave} {
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# we are going to be called for each widget... skip untill it's
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# top level
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Log $slave "Called tkDelete $W $window" NOTICE
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if {[::interp exists $slave]} {
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if {[catch {::safe::interpDelete $slave} msg]} {
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Log $slave "Deletion error : $msg"
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}
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}
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if {[winfo exists $window]} {
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Log $slave "Destroy toplevel $window" NOTICE
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destroy $window
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}
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# clean up tkInit(slave)
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disallowTk $slave
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return
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}
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proc ::safe::tkTopLevel {slave display} {
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variable tkSafeId
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incr tkSafeId
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set w ".safe$tkSafeId"
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if {[catch {toplevel $w -screen $display -class SafeTk} msg]} {
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return -code error -errorcode {TK TOPLEVEL SAFE} \
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"Unable to create toplevel for safe slave \"$slave\" ($msg)"
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}
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Log $slave "New toplevel $w" NOTICE
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set msg "Untrusted Tcl applet ($slave)"
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wm title $w $msg
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# Control frame (we must create a style for it)
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ttk::style layout TWarningFrame {WarningFrame.border -sticky nswe}
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ttk::style configure TWarningFrame -background red
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set wc $w.fc
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ttk::frame $wc -relief ridge -borderwidth 4 -style TWarningFrame
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# We will destroy the interp when the window is destroyed
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bindtags $wc [concat Safe$wc [bindtags $wc]]
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bind Safe$wc <Destroy> [list ::safe::tkDelete %W $w $slave]
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ttk::label $wc.l -text $msg -anchor w
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# We want the button to be the last visible item
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# (so be packed first) and at the right and not resizing horizontally
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# frame the button so it does not expand horizontally
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# but still have the default background instead of red one from the parent
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ttk::frame $wc.fb -borderwidth 0
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ttk::button $wc.fb.b -text "Delete" \
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-command [list ::safe::tkDelete $w $w $slave]
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pack $wc.fb.b -side right -fill both
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pack $wc.fb -side right -fill both -expand 1
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pack $wc.l -side left -fill both -expand 1 -ipady 2
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pack $wc -side bottom -fill x
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# Container frame
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frame $w.c -container 1
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pack $w.c -fill both -expand 1
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# return both the toplevel window name and the id to use for embedding
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list $w [winfo id $w.c]
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}
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