d28684b5a5
* guix/pki.scm (signature-subject, signature-signed-data, valid-signature?): New procedures. * guix/scripts/authenticate.scm (guix-authenticate): Adjust to use them.
100 lines
4.0 KiB
Scheme
100 lines
4.0 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014 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 utils)
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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 (rnrs io ports)
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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 file)
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"Read a gcrypt sexp from FILE and return it."
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(call-with-input-file file
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(compose string->canonical-sexp get-string-all)))
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(define (read-hash-data file)
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"Read sha256 hash data from FILE and return it as a gcrypt sexp."
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(let* ((hex (call-with-input-file file get-string-all))
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(bv (base16-string->bytevector (string-trim-both hex))))
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(bytevector->hash-data bv)))
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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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(match args
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(("rsautl" "-sign" "-inkey" key "-in" hash-file)
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;; Sign the hash in HASH-FILE with KEY, and return an sexp that includes
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;; both the hash and the actual signature.
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(let* ((secret-key (read-canonical-sexp key))
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(public-key (if (string-suffix? ".sec" key)
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(read-canonical-sexp
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(string-append (string-drop-right key 4) ".pub"))
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(leave
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(_ "cannot find public key for secret key '~a'~%")
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key)))
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(data (read-hash-data hash-file))
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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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(("rsautl" "-verify" "-inkey" _ "-pubin" "-in" signature-file)
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;; Read the signature as produced above, check whether its public key is
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;; authorized, and verify the signature, and print the signed data to
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;; stdout upon success.
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(let* ((signature (read-canonical-sexp signature-file))
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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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(("--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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