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authenticate: Disallow imports signed with unauthorized keys. 

* guix/scripts/authenticate.scm (signature-sexp): Remove.
  (guix-authenticate): Upon '-verify', check whether the signature's
  public key passes 'authorized-key?'.
This commit is contained in:
Ludovic Courtès 2013-12-29 15:55:38 +01:00
parent 8b420f74e4
commit 96e5085c81
1 changed files with 20 additions and 23 deletions
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43
guix/scripts/authenticate.scm
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@ -20,6 +20,7 @@
#:use-module (guix config)
#:use-module (guix utils)
#:use-module (guix pk-crypto)
#:use-module (guix pki)
#:use-module (guix ui)
#:use-module (rnrs io ports)
#:use-module (ice-9 match)
@ -44,17 +45,6 @@
(bv (base16-string->bytevector (string-trim-both hex))))
(bytevector->hash-data bv)))
(define (signature-sexp data secret-key public-key)
"Return a SPKI-style sexp for the signature of DATA with SECRET-KEY that
includes DATA, the actual signature value (with a 'sig-val' tag), and
PUBLIC-KEY (see <http://theworld.com/~cme/spki.txt> for examples.)"
(string->canonical-sexp
(format #f
"(signature ~a ~a ~a)"
(canonical-sexp->string data)
(canonical-sexp->string (sign data secret-key))
(canonical-sexp->string public-key))))
;;;
;;; Entry point with 'openssl'-compatible interface. We support this
@ -77,23 +67,30 @@ PUBLIC-KEY (see <http://theworld.com/~cme/spki.txt> for examples.)"
(signature (signature-sexp data secret-key public-key)))
(display (canonical-sexp->string signature))
#t))
(("rsautl" "-verify" "-inkey" key "-pubin" "-in" signature-file)
;; Read the signature as produced above, check it against KEY, and print
;; the signed data to stdout upon success.
(let* ((public-key (read-canonical-sexp key))
(sig+data (read-canonical-sexp signature-file))
(("rsautl" "-verify" "-inkey" _ "-pubin" "-in" signature-file)
;; Read the signature as produced above, check whether its public key is
;; authorized, and verify the signature, and print the signed data to
;; stdout upon success.
(let* ((sig+data (read-canonical-sexp signature-file))
(public-key (find-sexp-token sig+data 'public-key))
(data (find-sexp-token sig+data 'data))
(signature (find-sexp-token sig+data 'sig-val)))
(if (and data signature)
(if (verify signature data public-key)
(begin
(display (bytevector->base16-string
(hash-data->bytevector data)))
#t) ; success
(if (authorized-key? public-key)
(if (verify signature data public-key)
(begin
(display (bytevector->base16-string
(hash-data->bytevector data)))
#t) ; success
(begin
(format (current-error-port)
"error: invalid signature: ~a~%"
(canonical-sexp->string signature))
(exit 1)))
(begin
(format (current-error-port)
"error: invalid signature: ~a~%"
(canonical-sexp->string signature))
"error: unauthorized public key: ~a~%"
(canonical-sexp->string public-key))
(exit 1)))
(begin
(format (current-error-port)