1128 lines
32 KiB
Tcl
1128 lines
32 KiB
Tcl
# safe.tcl --
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#
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# This file provide a safe loading/sourcing mechanism for safe interpreters.
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# It implements a virtual path mecanism to hide the real pathnames from the
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# slave. It runs in a master interpreter and sets up data structure and
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# aliases that will be invoked when used from a slave interpreter.
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#
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# See the safe.n man page for details.
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#
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# Copyright (c) 1996-1997 Sun Microsystems, Inc.
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#
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# See the file "license.terms" for information on usage and redistribution of
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# this file, and for a DISCLAIMER OF ALL WARRANTIES.
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#
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# The implementation is based on namespaces. These naming conventions are
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# followed:
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# Private procs starts with uppercase.
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# Public procs are exported and starts with lowercase
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#
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# Needed utilities package
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package require opt 0.4.1
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# Create the safe namespace
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namespace eval ::safe {
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# Exported API:
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namespace export interpCreate interpInit interpConfigure interpDelete \
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interpAddToAccessPath interpFindInAccessPath setLogCmd
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}
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# Helper function to resolve the dual way of specifying staticsok (either
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# by -noStatics or -statics 0)
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proc ::safe::InterpStatics {} {
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foreach v {Args statics noStatics} {
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upvar $v $v
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}
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set flag [::tcl::OptProcArgGiven -noStatics]
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if {$flag && (!$noStatics == !$statics)
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&& ([::tcl::OptProcArgGiven -statics])} {
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return -code error\
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"conflicting values given for -statics and -noStatics"
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}
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if {$flag} {
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return [expr {!$noStatics}]
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} else {
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return $statics
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}
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}
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# Helper function to resolve the dual way of specifying nested loading
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# (either by -nestedLoadOk or -nested 1)
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proc ::safe::InterpNested {} {
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foreach v {Args nested nestedLoadOk} {
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upvar $v $v
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}
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set flag [::tcl::OptProcArgGiven -nestedLoadOk]
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# note that the test here is the opposite of the "InterpStatics" one
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# (it is not -noNested... because of the wanted default value)
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if {$flag && (!$nestedLoadOk != !$nested)
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&& ([::tcl::OptProcArgGiven -nested])} {
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return -code error\
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"conflicting values given for -nested and -nestedLoadOk"
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}
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if {$flag} {
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# another difference with "InterpStatics"
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return $nestedLoadOk
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} else {
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return $nested
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}
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}
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####
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#
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# API entry points that needs argument parsing :
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#
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####
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# Interface/entry point function and front end for "Create"
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proc ::safe::interpCreate {args} {
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set Args [::tcl::OptKeyParse ::safe::interpCreate $args]
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InterpCreate $slave $accessPath \
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[InterpStatics] [InterpNested] $deleteHook
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}
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proc ::safe::interpInit {args} {
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set Args [::tcl::OptKeyParse ::safe::interpIC $args]
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if {![::interp exists $slave]} {
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return -code error "\"$slave\" is not an interpreter"
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}
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InterpInit $slave $accessPath \
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[InterpStatics] [InterpNested] $deleteHook
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}
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# Check that the given slave is "one of us"
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proc ::safe::CheckInterp {slave} {
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namespace upvar ::safe S$slave state
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if {![info exists state] || ![::interp exists $slave]} {
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return -code error \
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"\"$slave\" is not an interpreter managed by ::safe::"
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}
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}
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# Interface/entry point function and front end for "Configure". This code
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# is awfully pedestrian because it would need more coupling and support
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# between the way we store the configuration values in safe::interp's and
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# the Opt package. Obviously we would like an OptConfigure to avoid
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# duplicating all this code everywhere.
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# -> TODO (the app should share or access easily the program/value stored
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# by opt)
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# This is even more complicated by the boolean flags with no values that
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# we had the bad idea to support for the sake of user simplicity in
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# create/init but which makes life hard in configure...
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# So this will be hopefully written and some integrated with opt1.0
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# (hopefully for tcl8.1 ?)
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proc ::safe::interpConfigure {args} {
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switch [llength $args] {
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1 {
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# If we have exactly 1 argument the semantic is to return all
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# the current configuration. We still call OptKeyParse though
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# we know that "slave" is our given argument because it also
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# checks for the "-help" option.
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set Args [::tcl::OptKeyParse ::safe::interpIC $args]
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CheckInterp $slave
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namespace upvar ::safe S$slave state
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return [join [list \
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[list -accessPath $state(access_path)] \
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[list -statics $state(staticsok)] \
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[list -nested $state(nestedok)] \
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[list -deleteHook $state(cleanupHook)]]]
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}
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2 {
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# If we have exactly 2 arguments the semantic is a "configure
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# get"
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lassign $args slave arg
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# get the flag sub program (we 'know' about Opt's internal
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# representation of data)
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set desc [lindex [::tcl::OptKeyGetDesc ::safe::interpIC] 2]
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set hits [::tcl::OptHits desc $arg]
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if {$hits > 1} {
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return -code error [::tcl::OptAmbigous $desc $arg]
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} elseif {$hits == 0} {
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return -code error [::tcl::OptFlagUsage $desc $arg]
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}
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CheckInterp $slave
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namespace upvar ::safe S$slave state
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set item [::tcl::OptCurDesc $desc]
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set name [::tcl::OptName $item]
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switch -exact -- $name {
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-accessPath {return [list -accessPath $state(access_path)]}
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-statics {return [list -statics $state(staticsok)]}
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-nested {return [list -nested $state(nestedok)]}
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-deleteHook {return [list -deleteHook $state(cleanupHook)]}
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-noStatics {
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# it is most probably a set in fact but we would need
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# then to jump to the set part and it is not *sure*
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# that it is a set action that the user want, so force
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# it to use the unambigous -statics ?value? instead:
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return -code error\
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"ambigous query (get or set -noStatics ?)\
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use -statics instead"
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}
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-nestedLoadOk {
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return -code error\
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"ambigous query (get or set -nestedLoadOk ?)\
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use -nested instead"
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}
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default {
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return -code error "unknown flag $name (bug)"
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}
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}
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}
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default {
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# Otherwise we want to parse the arguments like init and
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# create did
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set Args [::tcl::OptKeyParse ::safe::interpIC $args]
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CheckInterp $slave
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namespace upvar ::safe S$slave state
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# Get the current (and not the default) values of whatever has
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# not been given:
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if {![::tcl::OptProcArgGiven -accessPath]} {
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set doreset 1
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set accessPath $state(access_path)
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} else {
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set doreset 0
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}
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if {
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![::tcl::OptProcArgGiven -statics]
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&& ![::tcl::OptProcArgGiven -noStatics]
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} {
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set statics $state(staticsok)
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} else {
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set statics [InterpStatics]
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}
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if {
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[::tcl::OptProcArgGiven -nested] ||
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[::tcl::OptProcArgGiven -nestedLoadOk]
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} {
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set nested [InterpNested]
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} else {
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set nested $state(nestedok)
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}
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if {![::tcl::OptProcArgGiven -deleteHook]} {
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set deleteHook $state(cleanupHook)
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}
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# we can now reconfigure :
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InterpSetConfig $slave $accessPath $statics $nested $deleteHook
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# auto_reset the slave (to completly synch the new access_path)
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if {$doreset} {
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if {[catch {::interp eval $slave {auto_reset}} msg]} {
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Log $slave "auto_reset failed: $msg"
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} else {
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Log $slave "successful auto_reset" NOTICE
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}
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}
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}
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}
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}
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####
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#
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# Functions that actually implements the exported APIs
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#
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####
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#
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# safe::InterpCreate : doing the real job
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#
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# This procedure creates a safe slave and initializes it with the safe
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# base aliases.
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# NB: slave name must be simple alphanumeric string, no spaces, no (), no
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# {},... {because the state array is stored as part of the name}
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#
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# Returns the slave name.
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#
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# Optional Arguments :
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# + slave name : if empty, generated name will be used
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# + access_path: path list controlling where load/source can occur,
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# if empty: the master auto_path will be used.
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# + staticsok : flag, if 0 :no static package can be loaded (load {} Xxx)
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# if 1 :static packages are ok.
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# + nestedok: flag, if 0 :no loading to sub-sub interps (load xx xx sub)
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# if 1 : multiple levels are ok.
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# use the full name and no indent so auto_mkIndex can find us
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proc ::safe::InterpCreate {
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slave
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access_path
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staticsok
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nestedok
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deletehook
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} {
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# Create the slave.
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if {$slave ne ""} {
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::interp create -safe $slave
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} else {
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# empty argument: generate slave name
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set slave [::interp create -safe]
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}
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Log $slave "Created" NOTICE
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# Initialize it. (returns slave name)
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InterpInit $slave $access_path $staticsok $nestedok $deletehook
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}
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#
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# InterpSetConfig (was setAccessPath) :
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# Sets up slave virtual auto_path and corresponding structure within
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# the master. Also sets the tcl_library in the slave to be the first
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# directory in the path.
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# NB: If you change the path after the slave has been initialized you
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# probably need to call "auto_reset" in the slave in order that it gets
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# the right auto_index() array values.
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proc ::safe::InterpSetConfig {slave access_path staticsok nestedok deletehook} {
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global auto_path
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# determine and store the access path if empty
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if {$access_path eq ""} {
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set access_path $auto_path
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# Make sure that tcl_library is in auto_path and at the first
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# position (needed by setAccessPath)
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set where [lsearch -exact $access_path [info library]]
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if {$where == -1} {
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# not found, add it.
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set access_path [linsert $access_path 0 [info library]]
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Log $slave "tcl_library was not in auto_path,\
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added it to slave's access_path" NOTICE
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} elseif {$where != 0} {
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# not first, move it first
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set access_path [linsert \
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[lreplace $access_path $where $where] \
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0 [info library]]
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Log $slave "tcl_libray was not in first in auto_path,\
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moved it to front of slave's access_path" NOTICE
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}
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# Add 1st level sub dirs (will searched by auto loading from tcl
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# code in the slave using glob and thus fail, so we add them here
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# so by default it works the same).
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set access_path [AddSubDirs $access_path]
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}
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Log $slave "Setting accessPath=($access_path) staticsok=$staticsok\
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nestedok=$nestedok deletehook=($deletehook)" NOTICE
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namespace upvar ::safe S$slave state
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# clear old autopath if it existed
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# build new one
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# Extend the access list with the paths used to look for Tcl Modules.
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# We save the virtual form separately as well, as syncing it with the
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# slave has to be defered until the necessary commands are present for
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# setup.
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set norm_access_path {}
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set slave_access_path {}
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set map_access_path {}
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set remap_access_path {}
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set slave_tm_path {}
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set i 0
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foreach dir $access_path {
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set token [PathToken $i]
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lappend slave_access_path $token
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lappend map_access_path $token $dir
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lappend remap_access_path $dir $token
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lappend norm_access_path [file normalize $dir]
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incr i
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}
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set morepaths [::tcl::tm::list]
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while {[llength $morepaths]} {
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set addpaths $morepaths
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set morepaths {}
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foreach dir $addpaths {
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# Prevent the addition of dirs on the tm list to the
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# result if they are already known.
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if {[dict exists $remap_access_path $dir]} {
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continue
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}
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set token [PathToken $i]
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lappend access_path $dir
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lappend slave_access_path $token
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lappend map_access_path $token $dir
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lappend remap_access_path $dir $token
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lappend norm_access_path [file normalize $dir]
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lappend slave_tm_path $token
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incr i
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# [Bug 2854929]
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# Recursively find deeper paths which may contain
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# modules. Required to handle modules with names like
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# 'platform::shell', which translate into
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# 'platform/shell-X.tm', i.e arbitrarily deep
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# subdirectories.
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lappend morepaths {*}[glob -nocomplain -directory $dir -type d *]
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}
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}
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set state(access_path) $access_path
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set state(access_path,map) $map_access_path
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set state(access_path,remap) $remap_access_path
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set state(access_path,norm) $norm_access_path
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set state(access_path,slave) $slave_access_path
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set state(tm_path_slave) $slave_tm_path
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set state(staticsok) $staticsok
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set state(nestedok) $nestedok
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set state(cleanupHook) $deletehook
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SyncAccessPath $slave
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}
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#
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#
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# FindInAccessPath:
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# Search for a real directory and returns its virtual Id (including the
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# "$")
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proc ::safe::interpFindInAccessPath {slave path} {
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namespace upvar ::safe S$slave state
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if {![dict exists $state(access_path,remap) $path]} {
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return -code error "$path not found in access path $access_path"
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}
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return [dict get $state(access_path,remap) $path]
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}
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#
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# addToAccessPath:
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# add (if needed) a real directory to access path and return its
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# virtual token (including the "$").
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proc ::safe::interpAddToAccessPath {slave path} {
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# first check if the directory is already in there
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# (inlined interpFindInAccessPath).
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namespace upvar ::safe S$slave state
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if {[dict exists $state(access_path,remap) $path]} {
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return [dict get $state(access_path,remap) $path]
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}
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# new one, add it:
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set token [PathToken [llength $state(access_path)]]
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lappend state(access_path) $path
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lappend state(access_path,slave) $token
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lappend state(access_path,map) $token $path
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lappend state(access_path,remap) $path $token
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lappend state(access_path,norm) [file normalize $path]
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SyncAccessPath $slave
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return $token
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}
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# This procedure applies the initializations to an already existing
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# interpreter. It is useful when you want to install the safe base aliases
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# into a preexisting safe interpreter.
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proc ::safe::InterpInit {
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slave
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access_path
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staticsok
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nestedok
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deletehook
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} {
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# Configure will generate an access_path when access_path is empty.
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InterpSetConfig $slave $access_path $staticsok $nestedok $deletehook
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# NB we need to add [namespace current], aliases are always absolute
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# paths.
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# These aliases let the slave load files to define new commands
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# This alias lets the slave use the encoding names, convertfrom,
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# convertto, and system, but not "encoding system <name>" to set the
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# system encoding.
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# Handling Tcl Modules, we need a restricted form of Glob.
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# This alias interposes on the 'exit' command and cleanly terminates
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# the slave.
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foreach {command alias} {
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source AliasSource
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load AliasLoad
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encoding AliasEncoding
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exit interpDelete
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glob AliasGlob
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} {
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::interp alias $slave $command {} [namespace current]::$alias $slave
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}
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# This alias lets the slave have access to a subset of the 'file'
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# command functionality.
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AliasSubset $slave file \
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file dir.* join root.* ext.* tail path.* split
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# Subcommands of info
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foreach {subcommand alias} {
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nameofexecutable AliasExeName
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} {
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::interp alias $slave ::tcl::info::$subcommand \
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{} [namespace current]::$alias $slave
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}
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# The allowed slave variables already have been set by Tcl_MakeSafe(3)
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# Source init.tcl and tm.tcl into the slave, to get auto_load and
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# other procedures defined:
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if {[catch {::interp eval $slave {
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source [file join $tcl_library init.tcl]
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}} msg]} {
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Log $slave "can't source init.tcl ($msg)"
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return -code error "can't source init.tcl into slave $slave ($msg)"
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}
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if {[catch {::interp eval $slave {
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source [file join $tcl_library tm.tcl]
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}} msg]} {
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Log $slave "can't source tm.tcl ($msg)"
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return -code error "can't source tm.tcl into slave $slave ($msg)"
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}
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# Sync the paths used to search for Tcl modules. This can be done only
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# now, after tm.tcl was loaded.
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namespace upvar ::safe S$slave state
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if {[llength $state(tm_path_slave)] > 0} {
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::interp eval $slave [list \
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::tcl::tm::add {*}[lreverse $state(tm_path_slave)]]
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}
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return $slave
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}
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|
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# Add (only if needed, avoid duplicates) 1 level of sub directories to an
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# existing path list. Also removes non directories from the returned
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# list.
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proc ::safe::AddSubDirs {pathList} {
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set res {}
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foreach dir $pathList {
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if {[file isdirectory $dir]} {
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# check that we don't have it yet as a children of a previous
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# dir
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if {$dir ni $res} {
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lappend res $dir
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}
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foreach sub [glob -directory $dir -nocomplain *] {
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if {[file isdirectory $sub] && ($sub ni $res)} {
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# new sub dir, add it !
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lappend res $sub
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}
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}
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|
}
|
|
}
|
|
return $res
|
|
}
|
|
|
|
# This procedure deletes a safe slave managed by Safe Tcl and cleans up
|
|
# associated state:
|
|
|
|
proc ::safe::interpDelete {slave} {
|
|
Log $slave "About to delete" NOTICE
|
|
|
|
namespace upvar ::safe S$slave state
|
|
|
|
# If the slave has a cleanup hook registered, call it. Check the
|
|
# existance because we might be called to delete an interp which has
|
|
# not been registered with us at all
|
|
|
|
if {[info exists state(cleanupHook)]} {
|
|
set hook $state(cleanupHook)
|
|
if {[llength $hook]} {
|
|
# remove the hook now, otherwise if the hook calls us somehow,
|
|
# we'll loop
|
|
unset state(cleanupHook)
|
|
if {[catch {
|
|
{*}$hook $slave
|
|
} err]} {
|
|
Log $slave "Delete hook error ($err)"
|
|
}
|
|
}
|
|
}
|
|
|
|
# Discard the global array of state associated with the slave, and
|
|
# delete the interpreter.
|
|
|
|
if {[info exists state]} {
|
|
unset state
|
|
}
|
|
|
|
# if we have been called twice, the interp might have been deleted
|
|
# already
|
|
if {[::interp exists $slave]} {
|
|
::interp delete $slave
|
|
Log $slave "Deleted" NOTICE
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
# Set (or get) the logging mecanism
|
|
|
|
proc ::safe::setLogCmd {args} {
|
|
variable Log
|
|
set la [llength $args]
|
|
if {$la == 0} {
|
|
return $Log
|
|
} elseif {$la == 1} {
|
|
set Log [lindex $args 0]
|
|
} else {
|
|
set Log $args
|
|
}
|
|
|
|
if {$Log eq ""} {
|
|
# Disable logging completely. Calls to it will be compiled out
|
|
# of all users.
|
|
proc ::safe::Log {args} {}
|
|
} else {
|
|
# Activate logging, define proper command.
|
|
|
|
proc ::safe::Log {slave msg {type ERROR}} {
|
|
variable Log
|
|
{*}$Log "$type for slave $slave : $msg"
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
# ------------------- END OF PUBLIC METHODS ------------
|
|
|
|
#
|
|
# Sets the slave auto_path to the master recorded value. Also sets
|
|
# tcl_library to the first token of the virtual path.
|
|
#
|
|
proc ::safe::SyncAccessPath {slave} {
|
|
namespace upvar ::safe S$slave state
|
|
|
|
set slave_access_path $state(access_path,slave)
|
|
::interp eval $slave [list set auto_path $slave_access_path]
|
|
|
|
Log $slave "auto_path in $slave has been set to $slave_access_path"\
|
|
NOTICE
|
|
|
|
# This code assumes that info library is the first element in the
|
|
# list of auto_path's. See -> InterpSetConfig for the code which
|
|
# ensures this condition.
|
|
|
|
::interp eval $slave [list \
|
|
set tcl_library [lindex $slave_access_path 0]]
|
|
}
|
|
|
|
# Returns the virtual token for directory number N.
|
|
proc ::safe::PathToken {n} {
|
|
# We need to have a ":" in the token string so [file join] on the
|
|
# mac won't turn it into a relative path.
|
|
return "\$p(:$n:)" ;# Form tested by case 7.2
|
|
}
|
|
|
|
#
|
|
# translate virtual path into real path
|
|
#
|
|
proc ::safe::TranslatePath {slave path} {
|
|
namespace upvar ::safe S$slave state
|
|
|
|
# somehow strip the namespaces 'functionality' out (the danger is that
|
|
# we would strip valid macintosh "../" queries... :
|
|
if {[string match "*::*" $path] || [string match "*..*" $path]} {
|
|
return -code error "invalid characters in path $path"
|
|
}
|
|
|
|
# Use a cached map instead of computed local vars and subst.
|
|
|
|
return [string map $state(access_path,map) $path]
|
|
}
|
|
|
|
# file name control (limit access to files/resources that should be a
|
|
# valid tcl source file)
|
|
proc ::safe::CheckFileName {slave file} {
|
|
# This used to limit what can be sourced to ".tcl" and forbid files
|
|
# with more than 1 dot and longer than 14 chars, but I changed that
|
|
# for 8.4 as a safe interp has enough internal protection already to
|
|
# allow sourcing anything. - hobbs
|
|
|
|
if {![file exists $file]} {
|
|
# don't tell the file path
|
|
return -code error "no such file or directory"
|
|
}
|
|
|
|
if {![file readable $file]} {
|
|
# don't tell the file path
|
|
return -code error "not readable"
|
|
}
|
|
}
|
|
|
|
# AliasGlob is the target of the "glob" alias in safe interpreters.
|
|
proc ::safe::AliasGlob {slave args} {
|
|
Log $slave "GLOB ! $args" NOTICE
|
|
set cmd {}
|
|
set at 0
|
|
array set got {
|
|
-directory 0
|
|
-nocomplain 0
|
|
-join 0
|
|
-tails 0
|
|
-- 0
|
|
}
|
|
|
|
if {$::tcl_platform(platform) eq "windows"} {
|
|
set dirPartRE {^(.*)[\\/]([^\\/]*)$}
|
|
} else {
|
|
set dirPartRE {^(.*)/([^/]*)$}
|
|
}
|
|
|
|
set dir {}
|
|
set virtualdir {}
|
|
|
|
while {$at < [llength $args]} {
|
|
switch -glob -- [set opt [lindex $args $at]] {
|
|
-nocomplain - -- - -join - -tails {
|
|
lappend cmd $opt
|
|
set got($opt) 1
|
|
incr at
|
|
}
|
|
-types - -type {
|
|
lappend cmd -types [lindex $args [incr at]]
|
|
incr at
|
|
}
|
|
-directory {
|
|
if {$got($opt)} {
|
|
return -code error \
|
|
{"-directory" cannot be used with "-path"}
|
|
}
|
|
set got($opt) 1
|
|
set virtualdir [lindex $args [incr at]]
|
|
incr at
|
|
}
|
|
pkgIndex.tcl {
|
|
# Oops, this is globbing a subdirectory in regular package
|
|
# search. That is not wanted. Abort, handler does catch
|
|
# already (because glob was not defined before). See
|
|
# package.tcl, lines 484ff in tclPkgUnknown.
|
|
return -code error "unknown command glob"
|
|
}
|
|
-* {
|
|
Log $slave "Safe base rejecting glob option '$opt'"
|
|
return -code error "Safe base rejecting glob option '$opt'"
|
|
}
|
|
default {
|
|
break
|
|
}
|
|
}
|
|
if {$got(--)} break
|
|
}
|
|
|
|
# Get the real path from the virtual one and check that the path is in the
|
|
# access path of that slave. Done after basic argument processing so that
|
|
# we know if -nocomplain is set.
|
|
if {$got(-directory)} {
|
|
if {[catch {
|
|
set dir [TranslatePath $slave $virtualdir]
|
|
DirInAccessPath $slave $dir
|
|
} msg]} {
|
|
Log $slave $msg
|
|
if {$got(-nocomplain)} {
|
|
return
|
|
}
|
|
return -code error "permission denied"
|
|
}
|
|
lappend cmd -directory $dir
|
|
}
|
|
|
|
# Apply the -join semantics ourselves
|
|
if {$got(-join)} {
|
|
set args [lreplace $args $at end [join [lrange $args $at end] "/"]]
|
|
}
|
|
|
|
# Process remaining pattern arguments
|
|
set firstPattern [llength $cmd]
|
|
foreach opt [lrange $args $at end] {
|
|
if {![regexp $dirPartRE $opt -> thedir thefile]} {
|
|
set thedir .
|
|
}
|
|
if {$thedir eq "*"} {
|
|
set mapped 0
|
|
foreach d [glob -directory [TranslatePath $slave $virtualdir] \
|
|
-types d -tails *] {
|
|
catch {
|
|
DirInAccessPath $slave \
|
|
[TranslatePath $slave [file join $virtualdir $d]]
|
|
if {$thefile eq "pkgIndex.tcl" || $thefile eq "*.tm"} {
|
|
lappend cmd [file join $d $thefile]
|
|
set mapped 1
|
|
}
|
|
}
|
|
}
|
|
if {$mapped} continue
|
|
}
|
|
if {[catch {
|
|
set thedir [file join $virtualdir $thedir]
|
|
DirInAccessPath $slave [TranslatePath $slave $thedir]
|
|
} msg]} {
|
|
Log $slave $msg
|
|
if {$got(-nocomplain)} continue
|
|
return -code error "permission denied"
|
|
}
|
|
lappend cmd $opt
|
|
}
|
|
|
|
Log $slave "GLOB = $cmd" NOTICE
|
|
|
|
if {$got(-nocomplain) && [llength $cmd] eq $firstPattern} {
|
|
return
|
|
}
|
|
if {[catch {
|
|
::interp invokehidden $slave glob {*}$cmd
|
|
} msg]} {
|
|
Log $slave $msg
|
|
return -code error "script error"
|
|
}
|
|
|
|
Log $slave "GLOB < $msg" NOTICE
|
|
|
|
# Translate path back to what the slave should see.
|
|
set res {}
|
|
set l [string length $dir]
|
|
foreach p $msg {
|
|
if {[string equal -length $l $dir $p]} {
|
|
set p [string replace $p 0 [expr {$l-1}] $virtualdir]
|
|
}
|
|
lappend res $p
|
|
}
|
|
|
|
Log $slave "GLOB > $res" NOTICE
|
|
return $res
|
|
}
|
|
|
|
# AliasSource is the target of the "source" alias in safe interpreters.
|
|
|
|
proc ::safe::AliasSource {slave args} {
|
|
set argc [llength $args]
|
|
# Extended for handling of Tcl Modules to allow not only "source
|
|
# filename", but "source -encoding E filename" as well.
|
|
if {[lindex $args 0] eq "-encoding"} {
|
|
incr argc -2
|
|
set encoding [lindex $args 1]
|
|
set at 2
|
|
if {$encoding eq "identity"} {
|
|
Log $slave "attempt to use the identity encoding"
|
|
return -code error "permission denied"
|
|
}
|
|
} else {
|
|
set at 0
|
|
set encoding {}
|
|
}
|
|
if {$argc != 1} {
|
|
set msg "wrong # args: should be \"source ?-encoding E? fileName\""
|
|
Log $slave "$msg ($args)"
|
|
return -code error $msg
|
|
}
|
|
set file [lindex $args $at]
|
|
|
|
# get the real path from the virtual one.
|
|
if {[catch {
|
|
set realfile [TranslatePath $slave $file]
|
|
} msg]} {
|
|
Log $slave $msg
|
|
return -code error "permission denied"
|
|
}
|
|
|
|
# check that the path is in the access path of that slave
|
|
if {[catch {
|
|
FileInAccessPath $slave $realfile
|
|
} msg]} {
|
|
Log $slave $msg
|
|
return -code error "permission denied"
|
|
}
|
|
|
|
# do the checks on the filename :
|
|
if {[catch {
|
|
CheckFileName $slave $realfile
|
|
} msg]} {
|
|
Log $slave "$realfile:$msg"
|
|
return -code error $msg
|
|
}
|
|
|
|
# Passed all the tests, lets source it. Note that we do this all manually
|
|
# because we want to control [info script] in the slave so information
|
|
# doesn't leak so much. [Bug 2913625]
|
|
set old [::interp eval $slave {info script}]
|
|
set code [catch {
|
|
set f [open $realfile]
|
|
fconfigure $f -eofchar \032
|
|
if {$encoding ne ""} {
|
|
fconfigure $f -encoding $encoding
|
|
}
|
|
set contents [read $f]
|
|
close $f
|
|
::interp eval $slave [list info script $file]
|
|
::interp eval $slave $contents
|
|
} msg opt]
|
|
catch {interp eval $slave [list info script $old]}
|
|
# Note that all non-errors are fine result codes from [source], so we must
|
|
# take a little care to do it properly. [Bug 2923613]
|
|
if {$code == 1} {
|
|
Log $slave $msg
|
|
return -code error "script error"
|
|
}
|
|
return -code $code -options $opt $msg
|
|
}
|
|
|
|
# AliasLoad is the target of the "load" alias in safe interpreters.
|
|
|
|
proc ::safe::AliasLoad {slave file args} {
|
|
set argc [llength $args]
|
|
if {$argc > 2} {
|
|
set msg "load error: too many arguments"
|
|
Log $slave "$msg ($argc) {$file $args}"
|
|
return -code error $msg
|
|
}
|
|
|
|
# package name (can be empty if file is not).
|
|
set package [lindex $args 0]
|
|
|
|
namespace upvar ::safe S$slave state
|
|
|
|
# Determine where to load. load use a relative interp path and {}
|
|
# means self, so we can directly and safely use passed arg.
|
|
set target [lindex $args 1]
|
|
if {$target ne ""} {
|
|
# we will try to load into a sub sub interp; check that we want to
|
|
# authorize that.
|
|
if {!$state(nestedok)} {
|
|
Log $slave "loading to a sub interp (nestedok)\
|
|
disabled (trying to load $package to $target)"
|
|
return -code error "permission denied (nested load)"
|
|
}
|
|
}
|
|
|
|
# Determine what kind of load is requested
|
|
if {$file eq ""} {
|
|
# static package loading
|
|
if {$package eq ""} {
|
|
set msg "load error: empty filename and no package name"
|
|
Log $slave $msg
|
|
return -code error $msg
|
|
}
|
|
if {!$state(staticsok)} {
|
|
Log $slave "static packages loading disabled\
|
|
(trying to load $package to $target)"
|
|
return -code error "permission denied (static package)"
|
|
}
|
|
} else {
|
|
# file loading
|
|
|
|
# get the real path from the virtual one.
|
|
if {[catch {
|
|
set file [TranslatePath $slave $file]
|
|
} msg]} {
|
|
Log $slave $msg
|
|
return -code error "permission denied"
|
|
}
|
|
|
|
# check the translated path
|
|
if {[catch {
|
|
FileInAccessPath $slave $file
|
|
} msg]} {
|
|
Log $slave $msg
|
|
return -code error "permission denied (path)"
|
|
}
|
|
}
|
|
|
|
if {[catch {
|
|
::interp invokehidden $slave load $file $package $target
|
|
} msg]} {
|
|
Log $slave $msg
|
|
return -code error $msg
|
|
}
|
|
|
|
return $msg
|
|
}
|
|
|
|
# FileInAccessPath raises an error if the file is not found in the list of
|
|
# directories contained in the (master side recorded) slave's access path.
|
|
|
|
# the security here relies on "file dirname" answering the proper
|
|
# result... needs checking ?
|
|
proc ::safe::FileInAccessPath {slave file} {
|
|
namespace upvar ::safe S$slave state
|
|
set access_path $state(access_path)
|
|
|
|
if {[file isdirectory $file]} {
|
|
return -code error "\"$file\": is a directory"
|
|
}
|
|
set parent [file dirname $file]
|
|
|
|
# Normalize paths for comparison since lsearch knows nothing of
|
|
# potential pathname anomalies.
|
|
set norm_parent [file normalize $parent]
|
|
|
|
namespace upvar ::safe S$slave state
|
|
if {$norm_parent ni $state(access_path,norm)} {
|
|
return -code error "\"$file\": not in access_path"
|
|
}
|
|
}
|
|
|
|
proc ::safe::DirInAccessPath {slave dir} {
|
|
namespace upvar ::safe S$slave state
|
|
set access_path $state(access_path)
|
|
|
|
if {[file isfile $dir]} {
|
|
return -code error "\"$dir\": is a file"
|
|
}
|
|
|
|
# Normalize paths for comparison since lsearch knows nothing of
|
|
# potential pathname anomalies.
|
|
set norm_dir [file normalize $dir]
|
|
|
|
namespace upvar ::safe S$slave state
|
|
if {$norm_dir ni $state(access_path,norm)} {
|
|
return -code error "\"$dir\": not in access_path"
|
|
}
|
|
}
|
|
|
|
# This procedure enables access from a safe interpreter to only a subset
|
|
# of the subcommands of a command:
|
|
|
|
proc ::safe::Subset {slave command okpat args} {
|
|
set subcommand [lindex $args 0]
|
|
if {[regexp $okpat $subcommand]} {
|
|
return [$command {*}$args]
|
|
}
|
|
set msg "not allowed to invoke subcommand $subcommand of $command"
|
|
Log $slave $msg
|
|
return -code error $msg
|
|
}
|
|
|
|
# This procedure installs an alias in a slave that invokes "safesubset" in
|
|
# the master to execute allowed subcommands. It precomputes the pattern of
|
|
# allowed subcommands; you can use wildcards in the pattern if you wish to
|
|
# allow subcommand abbreviation.
|
|
#
|
|
# Syntax is: AliasSubset slave alias target subcommand1 subcommand2...
|
|
|
|
proc ::safe::AliasSubset {slave alias target args} {
|
|
set pat "^([join $args |])\$"
|
|
::interp alias $slave $alias {}\
|
|
[namespace current]::Subset $slave $target $pat
|
|
}
|
|
|
|
# AliasEncoding is the target of the "encoding" alias in safe interpreters.
|
|
|
|
proc ::safe::AliasEncoding {slave option args} {
|
|
# Careful; do not want empty option to get through to the [string equal]
|
|
if {[regexp {^(name.*|convert.*|)$} $option]} {
|
|
return [::interp invokehidden $slave encoding $option {*}$args]
|
|
}
|
|
|
|
if {[string equal -length [string length $option] $option "system"]} {
|
|
if {[llength $args] == 0} {
|
|
# passed all the tests , lets source it:
|
|
if {[catch {
|
|
set sysenc [::interp invokehidden $slave encoding system]
|
|
} msg]} {
|
|
Log $slave $msg
|
|
return -code error "script error"
|
|
}
|
|
return $sysenc
|
|
}
|
|
set msg "wrong # args: should be \"encoding system\""
|
|
set code {TCL WRONGARGS}
|
|
} else {
|
|
set msg "bad option \"$option\": must be convertfrom, convertto, names, or system"
|
|
set code [list TCL LOOKUP INDEX option $option]
|
|
}
|
|
Log $slave $msg
|
|
return -code error -errorcode $code $msg
|
|
}
|
|
|
|
# Various minor hiding of platform features. [Bug 2913625]
|
|
|
|
proc ::safe::AliasExeName {slave} {
|
|
return ""
|
|
}
|
|
|
|
proc ::safe::Setup {} {
|
|
####
|
|
#
|
|
# Setup the arguments parsing
|
|
#
|
|
####
|
|
|
|
# Share the descriptions
|
|
set temp [::tcl::OptKeyRegister {
|
|
{-accessPath -list {} "access path for the slave"}
|
|
{-noStatics "prevent loading of statically linked pkgs"}
|
|
{-statics true "loading of statically linked pkgs"}
|
|
{-nestedLoadOk "allow nested loading"}
|
|
{-nested false "nested loading"}
|
|
{-deleteHook -script {} "delete hook"}
|
|
}]
|
|
|
|
# create case (slave is optional)
|
|
::tcl::OptKeyRegister {
|
|
{?slave? -name {} "name of the slave (optional)"}
|
|
} ::safe::interpCreate
|
|
|
|
# adding the flags sub programs to the command program (relying on Opt's
|
|
# internal implementation details)
|
|
lappend ::tcl::OptDesc(::safe::interpCreate) $::tcl::OptDesc($temp)
|
|
|
|
# init and configure (slave is needed)
|
|
::tcl::OptKeyRegister {
|
|
{slave -name {} "name of the slave"}
|
|
} ::safe::interpIC
|
|
|
|
# adding the flags sub programs to the command program (relying on Opt's
|
|
# internal implementation details)
|
|
lappend ::tcl::OptDesc(::safe::interpIC) $::tcl::OptDesc($temp)
|
|
|
|
# temp not needed anymore
|
|
::tcl::OptKeyDelete $temp
|
|
|
|
####
|
|
#
|
|
# Default: No logging.
|
|
#
|
|
####
|
|
|
|
setLogCmd {}
|
|
|
|
# Log eventually.
|
|
# To enable error logging, set Log to {puts stderr} for instance,
|
|
# via setLogCmd.
|
|
return
|
|
}
|
|
|
|
namespace eval ::safe {
|
|
# internal variables
|
|
|
|
# Log command, set via 'setLogCmd'. Logging is disabled when empty.
|
|
variable Log {}
|
|
|
|
# The package maintains a state array per slave interp under its
|
|
# control. The name of this array is S<interp-name>. This array is
|
|
# brought into scope where needed, using 'namespace upvar'. The S
|
|
# prefix is used to avoid that a slave interp called "Log" smashes
|
|
# the "Log" variable.
|
|
#
|
|
# The array's elements are:
|
|
#
|
|
# access_path : List of paths accessible to the slave.
|
|
# access_path,norm : Ditto, in normalized form.
|
|
# access_path,slave : Ditto, as the path tokens as seen by the slave.
|
|
# access_path,map : dict ( token -> path )
|
|
# access_path,remap : dict ( path -> token )
|
|
# tm_path_slave : List of TM root directories, as tokens seen by the slave.
|
|
# staticsok : Value of option -statics
|
|
# nestedok : Value of option -nested
|
|
# cleanupHook : Value of option -deleteHook
|
|
}
|
|
|
|
::safe::Setup
|