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return [string is list $value]
} elseif {[catch {llength $value}] == 0} then {
return true
} else {
return false
}
}
proc isHarpyCertificate { value } {
if {[string length $value] == 0 || [string first [string trim {
<Certificate xmlns="https://eagle.to/2011/harpy"
}] $value] != -1} then {
return true
} else {
return false
}
}
proc isPgpSignature { value {strict false} } {
if {[string length $value] == 0 || [string first [string trim {
-----BEGIN PGP SIGNATURE-----
}] $value] != -1} then {
return true
} else {
return false
}
}
proc verifyPgpSignature { fileName } {
variable pgpCommand
if {[isEagle]} then {
set fileName [appendArgs \" $fileName \"]
return [expr {[catch {
eval exec -success Success [subst $pgpCommand]}] == 0
}]
} else {
return [expr {[catch {
eval exec [subst $pgpCommand] 2>@1
}] == 0}]
}
}
proc getLookupVarNamePrefix {} {
return ::rpkg_; # TODO: Make non-global?
}
proc getLookupVarNameSuffix {} {
return [appendArgs \
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# NOTE: If the package script certificate is mising, fail.
#
if {![info exists metadata(certificate)]} then {
error "missing script certificate"
}
#
# NOTE: Figure out the "type" of script certificate we are now dealing
# with.
#
if {[isHarpyCertificate $metadata(certificate)]} then {
#
# NOTE: Attempt to create a completely unique array variable name to
# hold the package metadata in this scripting language as well
# as possibly in the other necessary scripting language(s).
#
set newVarName [appendArgs \
[getLookupVarNamePrefix] metadata_ [getLookupVarNameSuffix]]
# NOTE: Attempt to create a completely unique array variable name to
# hold the package metadata in this scripting language as well
# as possibly in the other necessary scripting language(s).
#
set newVarName [appendArgs \
[getLookupVarNamePrefix] metadata_ [getLookupVarNameSuffix]]
set newProcName(1) [appendArgs \
[getLookupVarNamePrefix] eagleHasSecurity_ [getLookupVarNameSuffix]]
set newProcName(1) [appendArgs \
[getLookupVarNamePrefix] eagleHasSecurity_ [getLookupVarNameSuffix]]
set newProcName(2) [appendArgs \
[getLookupVarNamePrefix] tclMustBeReady_ [getLookupVarNameSuffix]]
set newProcName(2) [appendArgs \
[getLookupVarNamePrefix] tclMustBeReady_ [getLookupVarNameSuffix]]
#
# NOTE: Create the Eagle script block that will be used to securely
# evaluate a signed package script. This must be evaluated in
# Eagle because it uses several plugins only available there.
#
set script(outer) [string map [list \
%metadata% $newVarName %eagleHasSecurity% $newProcName(1) \
%tclMustBeReady% $newProcName(2)] {
try {
#
# NOTE: If there is no package ifneeded script, there is nothing we
# can do here.
#
if {[string length ${%metadata%(ifNeeded)}] > 0} then {
#
# NOTE: Save the security state for the interpreter. Then, attempt
# to enable it. This will fail if one of the needed plugins
# cannot be loaded.
#
set savedSecurity [{%eagleHasSecurity%}]
if {!$savedSecurity} then {source enableSecurity}
#
# NOTE: Create the Eagle script block that will be used to securely
# evaluate a signed package script. This must be evaluated in
# Eagle because it uses several plugins only available there.
#
set script(outer) [string map [list \
%metadata% $newVarName %eagleHasSecurity% $newProcName(1) \
%tclMustBeReady% $newProcName(2)] {
try {
#
# NOTE: If there is no package ifneeded script, there is nothing we
# can do here.
#
if {[string length ${%metadata%(ifNeeded)}] > 0} then {
#
# NOTE: Save the security state for the interpreter. Then, attempt
# to enable it. This will fail if one of the needed plugins
# cannot be loaded.
#
set savedSecurity [{%eagleHasSecurity%}]
if {!$savedSecurity} then {source enableSecurity}
try {
#
# NOTE: Figure out temporary file name for the downloaded script
# and its associated script certificate.
#
set fileName(1) [file tempname]
set fileName(2) [appendArgs $fileName(1) .harpy]
try {
#
# NOTE: Figure out temporary file name for the downloaded script
# and its associated script certificate.
#
set fileName(1) [file tempname]
set fileName(2) [appendArgs $fileName(1) .harpy]
try {
#
# NOTE: Write the downloaded script to a temporary file.
#
writeFile $fileName(1) ${%metadata%(ifNeeded)}
try {
#
# NOTE: Write the downloaded script to a temporary file.
#
writeFile $fileName(1) ${%metadata%(ifNeeded)}
#
# NOTE: Write the downloaded script certificateto a temporary
# file.
#
if {[string length ${%metadata%(certificate)}] > 0} then {
writeFile $fileName(2) ${%metadata%(certificate)}
}
#
# NOTE: Write the downloaded script certificateto a temporary
# file.
#
if {[string length ${%metadata%(certificate)}] > 0} then {
writeFile $fileName(2) ${%metadata%(certificate)}
}
#
# NOTE: This seems stupid. Why are we reading the downloaded
# script from the temporary file when we already had it
# in memory? The reason is that we need to make sure
# that the Harpy policy engine has a chance to check the
# downloaded script against its associated certificate.
# This will raise a script error if the script signature
# is missing or invalid.
#
set script(inner) [interp readorgetscriptfile -- \
"" $fileName(1)]
#
# NOTE: This seems stupid. Why are we reading the downloaded
# script from the temporary file when we already had it
# in memory? The reason is that we need to make sure
# that the Harpy policy engine has a chance to check the
# downloaded script against its associated certificate.
# This will raise a script error if the script signature
# is missing or invalid.
#
set script(inner) [interp readorgetscriptfile -- \
"" $fileName(1)]
#
# NOTE: Determine the target language for the package script,
# which may or may not be the language that is currently
# evaluating this script (Eagle). The default language,
# when one was not explicitly specified, is Eagle. In
# the future, this may be changed, e.g. to use the file
# extension of the client script.
#
switch -exact -- ${%metadata%(language)} {
"" -
Eagle {
#
# NOTE: The target language is Eagle, which is evaluating
# this script. No special handling is needed here.
#
return [uplevel #0 $script(inner)]
}
Tcl {
#
# NOTE: The target language is Tcl; therefore, a bit of
# special handling is needed here.
#
{%tclMustBeReady%}; return [tcl eval [tcl master] [list \
uplevel #0 $script(inner)]]
}
default {
error "unsupported language"
}
}
} finally {
#
# NOTE: Delete any temporary files that we created during the
# signed script evaluation.
#
if {[string length $fileName(2)] > 0 && \
[file exists $fileName(2)]} then {
catch {file delete $fileName(2)}
unset -nocomplain fileName(2)
}
#
# NOTE: Determine the target language for the package script,
# which may or may not be the language that is currently
# evaluating this script (Eagle). The default language,
# when one was not explicitly specified, is Eagle. In
# the future, this may be changed, e.g. to use the file
# extension of the client script.
#
switch -exact -- ${%metadata%(language)} {
"" -
Eagle {
#
# NOTE: The target language is Eagle, which is evaluating
# this script. No special handling is needed here.
#
return [uplevel #0 $script(inner)]
}
Tcl {
#
# NOTE: The target language is Tcl; therefore, a bit of
# special handling is needed here.
#
{%tclMustBeReady%}; return [tcl eval [tcl master] [list \
uplevel #0 $script(inner)]]
}
default {
error "unsupported language"
}
}
} finally {
#
# NOTE: Delete any temporary files that we created during the
# signed script evaluation.
#
if {[string length $fileName(2)] > 0 && \
[file exists $fileName(2)]} then {
catch {file delete $fileName(2)}
unset -nocomplain fileName(2)
}
if {[string length $fileName(1)] > 0 && \
[file exists $fileName(1)]} then {
catch {file delete $fileName(1)}
unset -nocomplain fileName(1)
}
}
} finally {
#
# NOTE: Restore the saved security state for the interpreter.
#
if {!$savedSecurity} then {source disableSecurity}
unset -nocomplain savedSecurity
}
}
} finally {
rename {%tclMustBeReady%} ""
rename {%eagleHasSecurity%} ""
if {[string length $fileName(1)] > 0 && \
[file exists $fileName(1)]} then {
catch {file delete $fileName(1)}
unset -nocomplain fileName(1)
}
}
} finally {
#
# NOTE: Restore the saved security state for the interpreter.
#
if {!$savedSecurity} then {source disableSecurity}
unset -nocomplain savedSecurity
}
}
} finally {
rename {%tclMustBeReady%} ""
rename {%eagleHasSecurity%} ""
unset -nocomplain {%metadata%}
}
}]
unset -nocomplain {%metadata%}
}
}]
#
# NOTE: Copy the package metadata into the fresh array variable,
# if necessary, marshalling it from native Tcl to Eagle.
#
if {[isEagle]} then {
array set $newVarName [array get metadata]
#
# NOTE: Copy the package metadata into the fresh array variable,
# if necessary, marshalling it from native Tcl to Eagle.
#
if {[isEagle]} then {
array set $newVarName [array get metadata]
proc $newProcName(1) {} [info body [appendArgs \
[namespace current] ::eagleHasSecurity]]
proc $newProcName(1) {} [info body [appendArgs \
[namespace current] ::eagleHasSecurity]]
proc $newProcName(2) {} [info body [appendArgs \
[namespace current] ::tclMustBeReady]]
proc $newProcName(2) {} [info body [appendArgs \
[namespace current] ::tclMustBeReady]]
return [eval $script(outer)]
} else {
eagleMustBeReady
return [eval $script(outer)]
} else {
eagleMustBeReady
eagle [list array set $newVarName [array get metadata]]
eagle [list array set $newVarName [array get metadata]]
eagle [list proc $newProcName(1) {} [info body [appendArgs \
[namespace current] ::eagleHasSecurity]]]
eagle [list proc $newProcName(1) {} [info body [appendArgs \
[namespace current] ::eagleHasSecurity]]]
eagle [list proc $newProcName(2) {} [info body [appendArgs \
[namespace current] ::tclMustBeReady]]]
eagle [list proc $newProcName(2) {} [info body [appendArgs \
[namespace current] ::tclMustBeReady]]]
return [eagle $script(outer)]
return [eagle $script(outer)]
}
} elseif {[isPgpSignature $metadata(certificate)]} then {
error "not yet implemented"
} else {
error "unsupported script certificate"
}
}
proc setupPackageUnknownHandler {} {
variable autoHook
variable autoLoadTcl
variable autoRequireGaruda
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# loaded from the Tcl language?
#
variable autoRequireGaruda; # DEFAULT: true
if {![info exists autoRequireGaruda]} then {
set autoRequireGaruda true
}
#
# NOTE: The command to use when verifying OpenPGP signatures for the
# downloaded package scripts.
#
variable pgpCommand; # DEFAULT: gpg2 --verify {${fileName}}
if {![info exists pgpCommand]} then {
set pgpCommand {gpg2 --verify {${fileName}}}
}
}
proc main { package version } {
#
# NOTE: Issue the lookup request to the remote package repository.
#
set data [getLookupData \
|