130 lines
5.3 KiB
Scheme
130 lines
5.3 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@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 (guix scripts authenticate)
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#:use-module (guix config)
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#:use-module (guix base16)
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#:use-module (guix pk-crypto)
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#:use-module (guix pki)
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#:use-module (guix ui)
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#:use-module (ice-9 binary-ports)
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#:use-module (ice-9 rdelim)
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#:use-module (ice-9 match)
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#:export (guix-authenticate))
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;;; Commentary:
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;;;
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;;; This program is used internally by the daemon to sign exported archive
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;;; (the 'export-paths' RPC), and to authenticate imported archives (the
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;;; 'import-paths' RPC.)
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;;;
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;;; Code:
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(define read-canonical-sexp
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;; Read a gcrypt sexp from a port and return it.
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(compose string->canonical-sexp read-string))
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(define (read-hash-data port key-type)
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"Read sha256 hash data from PORT and return it as a gcrypt sexp. KEY-TYPE
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is a symbol representing the type of public key algo being used."
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(let* ((hex (read-string port))
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(bv (base16-string->bytevector (string-trim-both hex))))
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(bytevector->hash-data bv #:key-type key-type)))
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(define (sign-with-key key-file port)
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"Sign the hash read from PORT with KEY-FILE, and write an sexp that includes
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both the hash and the actual signature."
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(let* ((secret-key (call-with-input-file key-file read-canonical-sexp))
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(public-key (if (string-suffix? ".sec" key-file)
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(call-with-input-file
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(string-append (string-drop-right key-file 4)
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".pub")
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read-canonical-sexp)
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(leave
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(_ "cannot find public key for secret key '~a'~%")
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key-file)))
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(data (read-hash-data port (key-type public-key)))
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(signature (signature-sexp data secret-key public-key)))
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(display (canonical-sexp->string signature))
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#t))
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(define (validate-signature port)
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"Read the signature from PORT (which is as produced above), check whether
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its public key is authorized, verify the signature, and print the signed data
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to stdout upon success."
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(let* ((signature (read-canonical-sexp port))
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(subject (signature-subject signature))
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(data (signature-signed-data signature)))
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(if (and data subject)
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(if (authorized-key? subject)
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(if (valid-signature? signature)
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(let ((hash (hash-data->bytevector data)))
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(display (bytevector->base16-string hash))
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#t) ; success
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(leave (_ "error: invalid signature: ~a~%")
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(canonical-sexp->string signature)))
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(leave (_ "error: unauthorized public key: ~a~%")
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(canonical-sexp->string subject)))
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(leave (_ "error: corrupt signature data: ~a~%")
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(canonical-sexp->string signature)))))
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;;;
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;;; Entry point with 'openssl'-compatible interface. We support this
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;;; interface because that's what the daemon expects, and we want to leave it
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;;; unmodified currently.
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;;;
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(define (guix-authenticate . args)
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;; Signature sexps written to stdout may contain binary data, so force
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;; ISO-8859-1 encoding so that things are not mangled. See
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;; <http://bugs.gnu.org/17312> for details.
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(set-port-encoding! (current-output-port) "ISO-8859-1")
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(set-port-conversion-strategy! (current-output-port) 'error)
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;; Same goes for input ports.
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(with-fluids ((%default-port-encoding "ISO-8859-1")
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(%default-port-conversion-strategy 'error))
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(match args
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;; As invoked by guix-daemon.
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(("rsautl" "-sign" "-inkey" key "-in" hash-file)
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(call-with-input-file hash-file
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(lambda (port)
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(sign-with-key key port))))
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;; As invoked by Nix/Crypto.pm (used by Hydra.)
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(("rsautl" "-sign" "-inkey" key)
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(sign-with-key key (current-input-port)))
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;; As invoked by guix-daemon.
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(("rsautl" "-verify" "-inkey" _ "-pubin" "-in" signature-file)
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(call-with-input-file signature-file
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(lambda (port)
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(validate-signature port))))
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;; As invoked by Nix/Crypto.pm (used by Hydra.)
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(("rsautl" "-verify" "-inkey" _ "-pubin")
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(validate-signature (current-input-port)))
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(("--help")
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(display (_ "Usage: guix authenticate OPTION...
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Sign or verify the signature on the given file. This tool is meant to
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be used internally by 'guix-daemon'.\n")))
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(("--version")
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(show-version-and-exit "guix authenticate"))
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(else
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(leave (_ "wrong arguments"))))))
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;;; authenticate.scm ends here
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