diff options
Diffstat (limited to 'build-aux/git-authenticate.scm')
| -rw-r--r-- | build-aux/git-authenticate.scm | 131 |
1 files changed, 62 insertions, 69 deletions
diff --git a/build-aux/git-authenticate.scm b/build-aux/git-authenticate.scm index bb48dddc59..0d5eb4caa9 100644 --- a/build-aux/git-authenticate.scm +++ b/build-aux/git-authenticate.scm @@ -23,8 +23,9 @@ (use-modules (git) (guix git) - (guix gnupg) - (guix utils) + (guix openpgp) + ((guix utils) #:select (config-directory)) + (guix base16) ((guix build utils) #:select (mkdir-p)) (guix i18n) (guix progress) @@ -215,7 +216,8 @@ ;; Fingerprint of authorized signing keys. (map (match-lambda ((name fingerprint) - (string-filter char-set:graphic fingerprint))) + (base16-string->bytevector + (string-downcase (string-filter char-set:graphic fingerprint))))) %committers)) (define %commits-with-bad-signature @@ -226,75 +228,63 @@ ;; Commits lacking a signature. '()) -(define-syntax-rule (with-temporary-files file1 file2 exp ...) - (call-with-temporary-output-file - (lambda (file1 port1) - (call-with-temporary-output-file - (lambda (file2 port2) - exp ...))))) - -(define (commit-signing-key repo commit-id) - "Return the OpenPGP key ID that signed COMMIT-ID (an OID). Raise an -exception if the commit is unsigned or has an invalid signature." +(define (commit-signing-key repo commit-id keyring) + "Return the OpenPGP key that signed COMMIT-ID (an OID). Raise an exception +if the commit is unsigned, has an invalid signature, or if its signing key is +not in KEYRING." (let-values (((signature signed-data) (catch 'git-error (lambda () (commit-extract-signature repo commit-id)) (lambda _ (values #f #f))))) - (if (not signature) - (raise (condition - (&message - (message (format #f (G_ "commit ~a lacks a signature") - commit-id))))) - (begin - (with-fluids ((%default-port-encoding "UTF-8")) - (with-temporary-files data-file signature-file - (call-with-output-file data-file - (cut display signed-data <>)) - (call-with-output-file signature-file - (cut display signature <>)) - - (let-values (((status data) - (with-error-to-port (%make-void-port "w") - (lambda () - (gnupg-verify* signature-file data-file - #:key-download 'always))))) - (match status - ('invalid-signature - ;; There's a signature but it's invalid. - (raise (condition - (&message - (message (format #f (G_ "signature verification failed \ + (unless signature + (raise (condition + (&message + (message (format #f (G_ "commit ~a lacks a signature") + commit-id)))))) + + (let ((signature (string->openpgp-packet signature))) + (with-fluids ((%default-port-encoding "UTF-8")) + (let-values (((status data) + (verify-openpgp-signature signature keyring + (open-input-string signed-data)))) + (match status + ('bad-signature + ;; There's a signature but it's invalid. + (raise (condition + (&message + (message (format #f (G_ "signature verification failed \ for commit ~a") - (oid->string commit-id))))))) - ('missing-key - (raise (condition - (&message - (message (format #f (G_ "could not authenticate \ + (oid->string commit-id))))))) + ('missing-key + (raise (condition + (&message + (message (format #f (G_ "could not authenticate \ commit ~a: key ~a is missing") - (oid->string commit-id) - data)))))) - ('valid-signature - (match data - ((fingerprint . user) - fingerprint))))))))))) - -(define (authenticate-commit repository commit) + (oid->string commit-id) + data)))))) + ('good-signature data))))))) + +(define (authenticate-commit repository commit keyring) "Authenticate COMMIT from REPOSITORY and return the signing key fingerprint. Raise an error when authentication fails." (define id (commit-id commit)) (define signing-key - (commit-signing-key repository id)) + (commit-signing-key repository id keyring)) - (unless (member signing-key %authorized-signing-keys) + (unless (member (openpgp-public-key-fingerprint signing-key) + %authorized-signing-keys) (raise (condition (&message (message (format #f (G_ "commit ~a not signed by an authorized \ key: ~a") - (oid->string id) signing-key)))))) + (oid->string id) + (openpgp-format-fingerprint + (openpgp-public-key-fingerprint + signing-key)))))))) signing-key) @@ -302,17 +292,21 @@ key: ~a") #:key (report-progress (const #t))) "Authenticate COMMITS, a list of commit objects, calling REPORT-PROGRESS for each of them. Return an alist showing the number of occurrences of each key." - (parameterize ((current-keyring (string-append (config-directory) - "/keyrings/channels/guix.kbx"))) - (fold (lambda (commit stats) - (report-progress) - (let ((signer (authenticate-commit repository commit))) - (match (assoc signer stats) - (#f (cons `(,signer . 1) stats)) - ((_ . count) (cons `(,signer . ,(+ count 1)) - (alist-delete signer stats)))))) - '() - commits))) + (define keyring-file + (string-append (config-directory) "/keyrings/channels/guix.kbx")) + + (define keyring + (call-with-input-file keyring-file get-openpgp-keyring)) + + (fold (lambda (commit stats) + (report-progress) + (let ((signer (authenticate-commit repository commit keyring))) + (match (assq signer stats) + (#f (cons `(,signer . 1) stats)) + ((_ . count) (cons `(,signer . ,(+ count 1)) + (alist-delete signer stats)))))) + '() + commits)) (define commit-short-id (compose (cut string-take <> 7) oid->string commit-id)) @@ -409,7 +403,10 @@ COMMIT-ID is written to cache, though)." (format #t (G_ "Signing statistics:~%")) (for-each (match-lambda ((signer . count) - (format #t " ~a ~10d~%" signer count))) + (format #t " ~a ~10d~%" + (openpgp-format-fingerprint + (openpgp-public-key-fingerprint signer)) + count))) (sort stats (match-lambda* (((_ . count1) (_ . count2)) @@ -423,7 +420,3 @@ COMMIT-ID is written to cache, though)." (G_ "Usage: git-authenticate START [END] Authenticate commits START to END or the current head.\n")))))) - -;;; Local Variables: -;;; eval: (put 'with-temporary-files 'scheme-indent-function 2) -;;; End: |