summaryrefslogtreecommitdiff
path: root/Master/tlpkg/tltcl/lib/tk8.6/safetk.tcl
blob: 9f8e25d094ce8a4d94bfbd194a3ec4d1cf6da3e8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
# safetk.tcl --
#
# Support procs to use Tk in safe interpreters.
#
# 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 is normalized.
    set tk_library [file normalize $tk_library]

    # Clear Tk's access for that interp (path).
    allowTk $slave $argv

    # Ensure tk_library and subdirs (eg, ttk) are on the access path
    ::interp eval $slave [list set tk_library [::safe::interpAddToAccessPath $slave $tk_library]]
    foreach subdir [::safe::AddSubDirs [list $tk_library]] {
	::safe::interpAddToAccessPath $slave $subdir
    }
    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 ::safe::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"
	    }
	}
    }

    # Get state for access to the cleanupHook.
    namespace upvar ::safe S$slave state

    if {![::tcl::OptProcArgGiven "-use"]} {
	# create a decorated toplevel
	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 state(cleanupHook) [list tkDelete {} $w]
    } else {
	# set our delete hook (slave arg is added by interpDelete)
	# to clean up tkInit(slave)
	set state(cleanupHook) [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} {
		return -code error -errorcode {TK DISPLAY SAFE} \
		    "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
	return -code error -errorcode {TK SAFE PERMISSION} "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 $display -class SafeTk} msg]} {
	return -code error -errorcode {TK TOPLEVEL SAFE} \
	    "Unable to create toplevel for safe slave \"$slave\" ($msg)"
    }
    Log $slave "New toplevel $w" NOTICE

    set msg "Untrusted Tcl applet ($slave)"
    wm title $w $msg

    # Control frame (we must create a style for it)
    ttk::style layout TWarningFrame {WarningFrame.border -sticky nswe}
    ttk::style configure TWarningFrame -background red

    set wc $w.fc
    ttk::frame $wc -relief ridge -borderwidth 4 -style TWarningFrame

    # 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]

    ttk::label $wc.l -text $msg -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
    ttk::frame  $wc.fb -borderwidth 0
    ttk::button $wc.fb.b -text "Delete" \
	    -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 -ipady 2
    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]
}