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-rw-r--r--guix/scripts/authenticate.scm86
1 files changed, 48 insertions, 38 deletions
diff --git a/guix/scripts/authenticate.scm b/guix/scripts/authenticate.scm
index 927dbe8afc..8bc148d730 100644
--- a/guix/scripts/authenticate.scm
+++ b/guix/scripts/authenticate.scm
@@ -34,18 +34,53 @@
;;;
;;; Code:
-(define (read-canonical-sexp file)
- "Read a gcrypt sexp from FILE and return it."
- (call-with-input-file file
- (compose string->canonical-sexp get-string-all)))
+(define read-canonical-sexp
+ ;; Read a gcrypt sexp from a port and return it.
+ (compose string->canonical-sexp get-string-all))
-(define (read-hash-data file key-type)
- "Read sha256 hash data from FILE and return it as a gcrypt sexp. KEY-TYPE
+(define (read-hash-data port key-type)
+ "Read sha256 hash data from PORT and return it as a gcrypt sexp. KEY-TYPE
is a symbol representing the type of public key algo being used."
- (let* ((hex (call-with-input-file file get-string-all))
+ (let* ((hex (get-string-all port))
(bv (base16-string->bytevector (string-trim-both hex))))
(bytevector->hash-data bv #:key-type key-type)))
+(define (sign-with-key key-file port)
+ "Sign the hash read from PORT with KEY-FILE, and write an sexp that includes
+both the hash and the actual signature."
+ (let* ((secret-key (call-with-input-file key-file read-canonical-sexp))
+ (public-key (if (string-suffix? ".sec" key-file)
+ (call-with-input-file
+ (string-append (string-drop-right key-file 4)
+ ".pub")
+ read-canonical-sexp)
+ (leave
+ (_ "cannot find public key for secret key '~a'~%")
+ key-file)))
+ (data (read-hash-data port (key-type public-key)))
+ (signature (signature-sexp data secret-key public-key)))
+ (display (canonical-sexp->string signature))
+ #t))
+
+(define (validate-signature port)
+ "Read the signature from PORT (which is as produced above), check whether
+its public key is authorized, verify the signature, and print the signed data
+to stdout upon success."
+ (let* ((signature (read-canonical-sexp port))
+ (subject (signature-subject signature))
+ (data (signature-signed-data signature)))
+ (if (and data subject)
+ (if (authorized-key? subject)
+ (if (valid-signature? signature)
+ (let ((hash (hash-data->bytevector data)))
+ (display (bytevector->base16-string hash))
+ #t) ; success
+ (leave (_ "error: invalid signature: ~a~%")
+ (canonical-sexp->string signature)))
+ (leave (_ "error: unauthorized public key: ~a~%")
+ (canonical-sexp->string subject)))
+ (leave (_ "error: corrupt signature data: ~a~%")
+ (canonical-sexp->string signature)))))
;;;
;;; Entry point with 'openssl'-compatible interface. We support this
@@ -56,38 +91,13 @@ is a symbol representing the type of public key algo being used."
(define (guix-authenticate . args)
(match args
(("rsautl" "-sign" "-inkey" key "-in" hash-file)
- ;; Sign the hash in HASH-FILE with KEY, and return an sexp that includes
- ;; both the hash and the actual signature.
- (let* ((secret-key (read-canonical-sexp key))
- (public-key (if (string-suffix? ".sec" key)
- (read-canonical-sexp
- (string-append (string-drop-right key 4) ".pub"))
- (leave
- (_ "cannot find public key for secret key '~a'~%")
- key)))
- (data (read-hash-data hash-file (key-type public-key)))
- (signature (signature-sexp data secret-key public-key)))
- (display (canonical-sexp->string signature))
- #t))
+ (call-with-input-file hash-file
+ (lambda (port)
+ (sign-with-key key port))))
(("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* ((signature (read-canonical-sexp signature-file))
- (subject (signature-subject signature))
- (data (signature-signed-data signature)))
- (if (and data subject)
- (if (authorized-key? subject)
- (if (valid-signature? signature)
- (let ((hash (hash-data->bytevector data)))
- (display (bytevector->base16-string hash))
- #t) ; success
- (leave (_ "error: invalid signature: ~a~%")
- (canonical-sexp->string signature)))
- (leave (_ "error: unauthorized public key: ~a~%")
- (canonical-sexp->string subject)))
- (leave (_ "error: corrupt signature data: ~a~%")
- (canonical-sexp->string signature)))))
+ (call-with-input-file signature-file
+ (lambda (port)
+ (validate-signature port))))
(("--help")
(display (_ "Usage: guix authenticate OPTION...
Sign or verify the signature on the given file. This tool is meant to