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authorLudovic Courtès <ludo@gnu.org>2014-03-31 23:34:20 +0200
committerLudovic Courtès <ludo@gnu.org>2014-03-31 23:34:20 +0200
commit81deef270ded7dabcc623d9522ae593ed02160af (patch)
tree965cb774c4def098060e5cbba520412e2dd9001c
parent8146fdb3342361dedcf36d96d7a53a7dc0858e63 (diff)
pki: Add 'signature-case' macro.
* guix/pki.scm (%signature-status): New procedure. (signature-case): New macro. * tests/pki.scm (%secret-key, %alternate-secret-key): New variables. ("signature-case valid-signature", "signature-case invalid-signature", "signature-case hash-mismatch", "signature-case unauthorized-key", "signature-case corrupt-signature"): New tests.
-rw-r--r--.dir-locals.el2
-rw-r--r--guix/pki.scm62
-rw-r--r--tests/pki.scm79
3 files changed, 139 insertions, 4 deletions
diff --git a/.dir-locals.el b/.dir-locals.el
index 22ade9f8a5..49380fe4ba 100644
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -8,6 +8,7 @@
((indent-tabs-mode . nil)
(eval . (put 'test-assert 'scheme-indent-function 1))
(eval . (put 'test-equal 'scheme-indent-function 1))
+ (eval . (put 'test-eq 'scheme-indent-function 1))
(eval . (put 'call-with-input-string 'scheme-indent-function 1))
(eval . (put 'guard 'scheme-indent-function 1))
(eval . (put 'lambda* 'scheme-indent-function 1))
@@ -24,6 +25,7 @@
(eval . (put 'with-atomic-file-output 'scheme-indent-function 1))
(eval . (put 'call-with-compressed-output-port 'scheme-indent-function 2))
(eval . (put 'call-with-decompressed-port 'scheme-indent-function 2))
+ (eval . (put 'signature-case 'scheme-indent-function 1))
(eval . (put 'syntax-parameterize 'scheme-indent-function 1))
(eval . (put 'with-monad 'scheme-indent-function 1))
diff --git a/guix/pki.scm b/guix/pki.scm
index 4b90b65a13..609c03f8d8 100644
--- a/guix/pki.scm
+++ b/guix/pki.scm
@@ -34,7 +34,8 @@
signature-sexp
signature-subject
signature-signed-data
- valid-signature?))
+ valid-signature?
+ signature-case))
;;; Commentary:
;;;
@@ -157,4 +158,63 @@ PUBLIC-KEY (see <http://theworld.com/~cme/spki.txt> for examples.)"
(and data signature
(verify signature data public-key))))
+(define* (%signature-status signature hash
+ #:optional (acl (current-acl)))
+ "Return a symbol denoting the status of SIGNATURE vs. HASH vs. ACL.
+
+This procedure must only be used internally, because it would be easy to
+forget some of the cases."
+ (let ((subject (signature-subject signature))
+ (data (signature-signed-data signature)))
+ (if (and data subject)
+ (if (authorized-key? subject acl)
+ (if (equal? (hash-data->bytevector data) hash)
+ (if (valid-signature? signature)
+ 'valid-signature
+ 'invalid-signature)
+ 'hash-mismatch)
+ 'unauthorized-key)
+ 'corrupt-signature)))
+
+(define-syntax signature-case
+ (syntax-rules (valid-signature invalid-signature
+ hash-mismatch unauthorized-key corrupt-signature
+ else)
+ "\
+Match the cases of the verification of SIGNATURE against HASH and ACL:
+
+ - the 'valid-signature' case if SIGNATURE is indeed a signature of HASH with
+ a key present in ACL;
+ - 'invalid-signature' if SIGNATURE is incorrect;
+ - 'hash-mismatch' if the hash in SIGNATURE does not match HASH;
+ - 'unauthorized-key' if the public key in SIGNATURE is not listed in ACL;
+ - 'corrupt-signature' if SIGNATURE is not a valid signature sexp.
+
+This macro guarantees at compile-time that all these cases are handled.
+
+SIGNATURE, and ACL must be canonical sexps; HASH must be a bytevector."
+
+ ;; Simple case: we only care about valid signatures.
+ ((_ (signature hash acl)
+ (valid-signature valid-exp ...)
+ (else else-exp ...))
+ (case (%signature-status signature hash acl)
+ ((valid-signature) valid-exp ...)
+ (else else-exp ...)))
+
+ ;; Full case.
+ ((_ (signature hash acl)
+ (valid-signature valid-exp ...)
+ (invalid-signature invalid-exp ...)
+ (hash-mismatch mismatch-exp ...)
+ (unauthorized-key unauthorized-exp ...)
+ (corrupt-signature corrupt-exp ...))
+ (case (%signature-status signature hash acl)
+ ((valid-signature) valid-exp ...)
+ ((invalid-signature) invalid-exp ...)
+ ((hash-mismatch) mismatch-exp ...)
+ ((unauthorized-key) unauthorized-exp ...)
+ ((corrupt-signature) corrupt-exp ...)
+ (else (error "bogus signature status"))))))
+
;;; pki.scm ends here
diff --git a/tests/pki.scm b/tests/pki.scm
index 04d5a5311b..51f2119466 100644
--- a/tests/pki.scm
+++ b/tests/pki.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -19,6 +19,7 @@
(define-module (test-pki)
#:use-module (guix pki)
#:use-module (guix pk-crypto)
+ #:use-module (guix hash)
#:use-module (rnrs io ports)
#:use-module (srfi srfi-64))
@@ -26,8 +27,28 @@
(define %public-key
(call-with-input-file %public-key-file
- (compose string->canonical-sexp
- get-string-all)))
+ (compose string->canonical-sexp get-string-all)))
+
+(define %secret-key
+ (call-with-input-file %private-key-file
+ (compose string->canonical-sexp get-string-all)))
+
+(define %alternate-secret-key
+ (string->canonical-sexp
+ "
+ (key-data
+ (public-key
+ (rsa
+ (n #00FDBF170366AC43B7D95CF9085565C566FB1F21B17C0A36E68F35ABB500E7851E00B40D7B04C8CD25903371F38E4C298FACEFFC4C97E913B536A0672BAF99D04515AE98A1A56627CD7EB02502FCFBEEA21AF13CC1A853192AD6409B9EFBD9F549BDE32BD890AE01F9A221E81FEE1C407090550647790E0D60775B855E181C2FB5#)
+ (e #010001#)))
+ (private-key
+ (rsa
+ (n #00FDBF170366AC43B7D95CF9085565C566FB1F21B17C0A36E68F35ABB500E7851E00B40D7B04C8CD25903371F38E4C298FACEFFC4C97E913B536A0672BAF99D04515AE98A1A56627CD7EB02502FCFBEEA21AF13CC1A853192AD6409B9EFBD9F549BDE32BD890AE01F9A221E81FEE1C407090550647790E0D60775B855E181C2FB5#)
+ (e #010001#)
+ (d #2790250C2E74C2FD361A99288BBA19B878048F5A0F333F829CC71B3DD64582DB9DF3F4DB1EB0994DD7493225EDA4A1E1492F44D903617FA5643E47BFC7BA157EF48B492AB51229916B02DDBDA0E7DBC7B35A6B8332AB463DC61951CA694551A9760F5A836A375D39E3EA8F2C502A3B5D89CB8777A809B75D603BE7511CEB74E9#)
+ (p #00FE15B1751E1C31125B724FF37462F9476239A2AFF4192FAB1550F76928C8D02407F4F5EFC83F7A0AF51BD93399DDC06A4B54DFA60A7079F160A9F618C0148AD9#)
+ (q #00FFA8BE7005AAB7401B0926CD9D6AC30BC9BE7D12C8737C9438498A999F56BE9F5EA98B4D7F5364BEB6D550A5AEDDE34C1EC152C9DAF61A97FDE71740C73BAA3D#)
+ (u #00FD4050EF4F31B41EC81C28E18D205DFFB3C188F15D8BBA300E30AD8B5C4D3E392EFE10269FC115A538B19F4025973AB09B6650A7FF97DA833FB726F3D8819319#))))"))
(test-begin "pki")
@@ -45,6 +66,58 @@
(test-assert "authorized-key? public-key singleton"
(authorized-key? %public-key (public-keys->acl (list %public-key))))
+(test-assert "signature-case valid-signature"
+ (let* ((hash (sha256 #vu8(1 2 3)))
+ (data (bytevector->hash-data hash #:key-type (key-type %public-key)))
+ (sig (signature-sexp data %secret-key %public-key)))
+ (signature-case (sig hash (public-keys->acl (list %public-key)))
+ (valid-signature #t)
+ (else #f))))
+
+(test-eq "signature-case invalid-signature" 'i
+ (let* ((hash (sha256 #vu8(1 2 3)))
+ (data (bytevector->hash-data hash #:key-type (key-type %public-key)))
+ (sig (signature-sexp data %alternate-secret-key %public-key)))
+ (signature-case (sig hash (public-keys->acl (list %public-key)))
+ (valid-signature 'v)
+ (invalid-signature 'i)
+ (hash-mismatch 'm)
+ (unauthorized-key 'u)
+ (corrupt-signature 'c))))
+
+(test-eq "signature-case hash-mismatch" 'm
+ (let* ((hash (sha256 #vu8(1 2 3)))
+ (data (bytevector->hash-data hash #:key-type (key-type %public-key)))
+ (sig (signature-sexp data %secret-key %public-key)))
+ (signature-case (sig (sha256 #vu8())
+ (public-keys->acl (list %public-key)))
+ (valid-signature 'v)
+ (invalid-signature 'i)
+ (hash-mismatch 'm)
+ (unauthorized-key 'u)
+ (corrupt-signature 'c))))
+
+(test-eq "signature-case unauthorized-key" 'u
+ (let* ((hash (sha256 #vu8(1 2 3)))
+ (data (bytevector->hash-data hash #:key-type (key-type %public-key)))
+ (sig (signature-sexp data %secret-key %public-key)))
+ (signature-case (sig hash (public-keys->acl '()))
+ (valid-signature 'v)
+ (invalid-signature 'i)
+ (hash-mismatch 'm)
+ (unauthorized-key 'u)
+ (corrupt-signature 'c))))
+
+(test-eq "signature-case corrupt-signature" 'c
+ (let* ((hash (sha256 #vu8(1 2 3)))
+ (sig (string->canonical-sexp "(w tf)")))
+ (signature-case (sig hash (public-keys->acl (list %public-key)))
+ (valid-signature 'v)
+ (invalid-signature 'i)
+ (hash-mismatch 'm)
+ (unauthorized-key 'u)
+ (corrupt-signature 'c))))
+
(test-end)