193 lines
8.1 KiB
Scheme
193 lines
8.1 KiB
Scheme
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2020 Marius Bakke <marius@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu build chromium-extension)
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#:use-module (gcrypt base16)
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#:use-module ((gcrypt hash) #:prefix hash:)
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#:use-module (ice-9 iconv)
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#:use-module (guix gexp)
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#:use-module (guix packages)
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#:use-module (gnu packages base)
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#:use-module (gnu packages check)
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#:use-module (gnu packages chromium)
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#:use-module (gnu packages gnupg)
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#:use-module (gnu packages tls)
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#:use-module (gnu packages xorg)
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#:use-module (guix build-system trivial)
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#:export (make-chromium-extension))
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;;; Commentary:
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;;;
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;;; Tools to deal with Chromium extensions.
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;;;
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;;; Code:
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(define (make-signing-key seed)
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"Return a derivation for a deterministic PKCS #8 private key using SEED."
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(define sha256sum
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(bytevector->base16-string (hash:sha256 (string->bytevector seed "UTF-8"))))
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;; certtool.c wants a 56 byte seed for a 2048 bit key.
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(define size 2048)
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(define normalized-seed (string-take sha256sum 56))
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(computed-file (string-append seed "-signing-key.pem")
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#~(system* #$(file-append gnutls "/bin/certtool")
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"--generate-privkey"
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"--key-type=rsa"
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"--pkcs8"
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;; Use the provable FIPS-PUB186-4 algorithm for
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;; deterministic results.
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"--provable"
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"--password="
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"--no-text"
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(string-append "--bits=" #$(number->string size))
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(string-append "--seed=" #$normalized-seed)
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"--outfile" #$output)
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#:local-build? #t))
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(define* (make-crx signing-key package #:optional (package-output "out"))
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"Create a signed \".crx\" file from the unpacked Chromium extension residing
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in PACKAGE-OUTPUT of PACKAGE. The extension will be signed with SIGNING-KEY."
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(define name (package-name package))
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(define version (package-version package))
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(with-imported-modules '((guix build utils))
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(computed-file
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(string-append name "-" version ".crx")
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#~(begin
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;; This is not great. We pull Xorg and Chromium just to Zip and
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;; sign an extension. This should be implemented with something
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;; lighter. (TODO: where is the CRXv3 documentation..?)
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(use-modules (guix build utils))
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(let ((chromium #$(file-append ungoogled-chromium "/bin/chromium"))
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(xvfb #$(file-append xorg-server "/bin/Xvfb"))
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(packdir "/tmp/extension"))
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(mkdir-p (dirname packdir))
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(copy-recursively (ungexp package package-output) packdir)
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(system (string-append xvfb " :1 &"))
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(setenv "DISPLAY" ":1")
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(sleep 2) ;give Xorg some time to initialize...
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;; Chromium stores the current time in the .crx Zip archive.
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;; Use a fixed timestamp for deterministic behavior.
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;; FIXME (core-updates): faketime is missing an absolute reference
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;; to 'date', hence the need to set PATH.
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(setenv "PATH" #$(file-append coreutils "/bin"))
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(invoke #$(file-append libfaketime "/bin/faketime")
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"2000-01-01 00:00:00"
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chromium
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"--user-data-dir=/tmp/signing-profile"
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(string-append "--pack-extension=" packdir)
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(string-append "--pack-extension-key=" #$signing-key))
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(copy-file (string-append packdir ".crx") #$output)))
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#:local-build? #t)))
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(define* (crx->chromium-json crx version)
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"Return a derivation that creates a Chromium JSON settings file for the
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extension given as CRX. VERSION is used to signify the CRX version, and
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must match the version listed in the extension manifest.json."
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;; See chrome/browser/extensions/external_provider_impl.cc and
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;; extensions/common/extension.h for documentation on the JSON format.
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(computed-file "extension.json"
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#~(call-with-output-file #$output
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(lambda (port)
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(format port "{
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\"external_crx\": \"~a\",
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\"external_version\": \"~a\"
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}
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"
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#$crx #$version)))
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#:local-build? #t))
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(define (signing-key->public-der key)
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"Return a derivation for a file containing the public key of KEY in DER
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format."
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(computed-file "der"
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#~(system* #$(file-append gnutls "/bin/certtool")
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"--load-privkey" #$key
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"--pubkey-info"
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"--outfile" #$output
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"--outder")
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#:local-build? #t))
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(define (chromium-json->profile-object json signing-key)
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"Return a derivation that installs JSON to the directory searched by
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Chromium, using a file name (aka extension ID) derived from SIGNING-KEY."
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(define der (signing-key->public-der signing-key))
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(with-extensions (list guile-gcrypt)
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(with-imported-modules '((guix build utils))
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(computed-file
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"chromium-extension"
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#~(begin
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(use-modules (guix build utils)
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(gcrypt base16)
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(gcrypt hash))
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(define (base16-string->chromium-base16 str)
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;; Translate STR, a hexadecimal string, to a Chromium-style
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;; representation using the letters a-p (where a=0, p=15).
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(define s1 "0123456789abcdef")
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(define s2 "abcdefghijklmnop")
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(let loop ((chars (string->list str))
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(converted '()))
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(if (null? chars)
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(list->string (reverse converted))
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(loop (cdr chars)
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(cons (string-ref s2 (string-index s1 (car chars)))
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converted)))))
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(let* ((checksum (bytevector->base16-string (file-sha256 #$der)))
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(file-name (base16-string->chromium-base16
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(string-take checksum 32)))
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(extension-directory (string-append #$output
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"/share/chromium/extensions")))
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(mkdir-p extension-directory)
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(symlink #$json (string-append extension-directory "/"
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file-name ".json"))))
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#:local-build? #t))))
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(define* (make-chromium-extension p #:optional (output "out"))
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"Create a Chromium extension from package P and return a package that,
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when installed, will make the extension contained in P available as a
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Chromium browser extension. OUTPUT specifies which output of P to use."
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(let* ((pname (package-name p))
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(version (package-version p))
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(signing-key (make-signing-key pname)))
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(package
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(inherit p)
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(name (string-append pname "-chromium"))
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(source #f)
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(build-system trivial-build-system)
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(native-inputs '())
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(inputs
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`(("extension" ,(chromium-json->profile-object
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(crx->chromium-json (make-crx signing-key p output)
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version)
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signing-key))))
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(propagated-inputs '())
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(outputs '("out"))
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(arguments
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'(#:modules ((guix build utils))
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#:builder
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(begin
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(use-modules (guix build utils))
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(copy-recursively (assoc-ref %build-inputs "extension")
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(assoc-ref %outputs "out"))))))))
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